JP6744785B2 - Lifting device and medical examination table - Google Patents

Description

The present invention relates to an elevating device for elevating a seat on which a patient sits, and a medical examination table equipped with the elevating device.

For example, a medical examination table used in dentistry, otolaryngology, etc. is equipped with an elevating device that vertically elevates and lowers a patient support portion that supports the body of a patient, so that the operating posture of an operator who performs the operation and the target of the operation. It is possible to appropriately adjust the patient support portion to a height at which the patient can easily get on and off.

As an example of an elevating device provided in such a medical examination table, a drive unit that is a hydraulic cylinder is connected to a patient support unit that supports a patient, and the patient support unit can be raised and lowered in accordance with the elevation of the drive unit. The above hydraulic lifting device is disclosed in Patent Document 1.

More specifically, the lifting device disclosed in Patent Document 1 has a rotation preventing member fixed to a columnar drive unit fixed to a base so as to be able to move up and down, and a lifting unit having upper ends fixed to the drive unit. The patient support part is connected to a support frame so that the patient support part can move up and down in conjunction with the lifting and lowering of the drive part.

However, in the lifting device, the rotation blocking member moves up and down in accordance with the lifting of the lifting support frame, so that the lower end portion of the rotation blocking member is fixed to the driving unit when the driving unit is extended, and the rotation blocking member is fixed. The member is susceptible to an external force acting on the patient support portion and is likely to tilt. On the other hand, when the drive section is contracted, the upper end portion of the rotation blocking member is fixed to the drive section, and is less likely to be affected by external force on the patient support section. In this way, the influence of the external force acting on the patient support changes depending on the expansion/contraction state of the drive unit, and there is a risk that the patient support cannot be moved up and down in a stable manner.

Japanese Utility Model Publication No. 5-030438

In view of the above problems, it is an object of the present invention to provide an elevating device and a medical examination table that can stably elevate and lower the patient support part.

The present invention extends in the vertical direction, a fixed shaft fixed relative to the base, a patient support for supporting a patient is connected to an upper end portion, vertically movable move in the vertical direction with respect to the fixed shaft a unit, a driving unit for raising and lowering is provided a mobile unit relative to the fixed shaft, the fixed shaft, the outer peripheral surface of the cylindrical body, said stationary shaft side chamfer portion is chamfered in a plane extending in the axial direction The moving unit is composed of substantially quadrangular columnar bodies provided at four locations on the outer peripheral surface of the columnar body at equal intervals in the circumferential direction, and the moving unit is connected to the patient support portion and arranged in parallel with the fixed shaft. The moving shaft includes a moving shaft and a connecting elevating member that connects the fixed shaft and the moving shaft and is movable in the axial direction with respect to the fixed shaft and the moving shaft. The moving shaft extends in the axial direction. The moving shaft side chamfer chamfered in a planar shape is constituted by substantially rectangular columnar bodies provided at four locations on the outer peripheral surface of the cylindrical body at equal intervals in the circumferential direction, and the connecting elevating member is the outer periphery of the fixed shaft. A fixed shaft side elevating part that fits on a surface and is guided in the up-down direction along the fixed shaft, and that elevates with respect to the fixed shaft, and is parallel to the fixed shaft side elevating part. And is integrally connected to the moving shaft side elevating part and is configured to roll in the circumferential direction on the inner peripheral surface of the guided part with respect to the fixed shaft chamfered part . moving object provided et al is, the moving shaft side elevation section, said fitted to the outer peripheral surface of the moving shaft, the guide portion is provided for guiding the lifting direction of the moving shaft, the circumferential on the inner peripheral surface of the guide portion Direction, a moving-shaft-side rolling element that rolls with respect to the moving-shaft chamfer is provided, and the fixed-shaft chamfer and the moving-shaft chamfer with respect to the arrangement direction of the moving shaft with respect to the fixed shaft. And the fixed shaft side elevating part and the moving shaft side elevating part are elevator devices arranged at different positions in the vertical direction. To do.

Further, the present invention is characterized in that the above-mentioned lifting device is provided, and the patient support portion is a medical examination table constituted by a seat support portion to which a seat for seating the patient is fixed.

The patient support part is a member that supports the patient when the elevating device is moved up and down. For example, in addition to a seat support part that fixes a seat seat that tiltably connects a back plate seat to one end, a tilting back plate seat. It may be a seat support portion in which the back plate and the seat are connected to each other to form a flat seat without having the.

The driving unit includes a power cylinder that vertically moves the moving unit up and down by pushing a rod, and a gear structure that vertically moves the moving unit by rotating a gear. Specifically, the power cylinder includes a hydraulic cylinder that is driven up and down by using hydraulic pressure, a cylinder that is driven up and down by using water pressure and air pressure, an electric cylinder that is electrically driven by a motor, and the like. The gear provided in the chamfer and the rolling element are used as gears, and the fixed shaft is moved up and down by the rotation of the rolling element, or a gear (pinion) meshed with the rack is provided with a rack along the fixed axis. Includes a gear structure that can be rotated by.

Fitting to the outer peripheral surface of the fixed shaft mentioned above means a state in which the moving unit is fitted to such an extent that it can move in the vertical direction along the fixed shaft. That is, the moving unit having the guided portion and the fixed shaft can move relative to each other in the vertical direction.

The guided portion may have a shape fitted so as to guide the moving unit in the vertical direction along the fixed shaft. For example, a shape similar to the outer peripheral surface of the fixed shaft or the fixed shaft may be used. It includes a fittable shape partially similar to the outer peripheral surface. Specifically, it includes a through hole having substantially the same shape as the bottom surface of the fixed shaft of the columnar body, a through hole fitted with a part of the outer peripheral surface of the fixed shaft, and the like.
The chamfer refers to taking a curved surface of the outer peripheral surface of the cylindrical body to create a flat surface portion, for example, when the outer peripheral surface of the cylindrical body is chamfered, or when the outer peripheral surface is cut, polished, forged, ground, or pressed. including.

According to the present invention, the patient support can be stably moved up and down.
More specifically, in the moving unit, since the guided portion can fit in the outer peripheral surface of the fixed shaft fixed to the base and can move up and down, for example, the driving portion is extended. Even in the state, the fixed shaft does not tilt due to an external force acting on the patient support, and the moving unit can be stably moved up and down.

Further, the moving unit includes the guided portion fitted to the outer peripheral surface of the fixed shaft having the chamfered portion, and in the circumferential direction of the inner peripheral surface of the guided portion, with respect to the chamfered portion. Since a rolling element that rolls around is provided, even when an external force acts on the moving unit and the moving unit tries to rotate with the fixed shaft as the rotation axis, a flat surface is formed along the vertical direction. The rolling element interferes with the chamfered portion formed in a shape, and relative rotation of the moving unit can be prevented.

Furthermore, the rolling element interferes with the chamfered portion to prevent the relative rotation of the moving unit. However, even if the rolling element interferes with the fixed shaft, the rolling element is The moving unit can be smoothly moved up and down by rolling with respect to the chamfered portion.
By fitting the moving unit to the fixed shaft fixed to the base in such a manner that the moving unit can be moved up and down, the moving unit can be smoothly moved up and down while preventing relative rotation of the moving unit. The support part can be stably moved up and down.

Further, since the force is uniformly applied to the fixed shaft from the circumferential direction of the fixed shaft, the moving unit can be smoothly moved up and down along the fixed shaft without rotating with respect to the base.

Further, since the chamfered portions are evenly arranged on the inner peripheral surface of the guided portion, the chamfered portions can evenly contact the rolling elements in the circumferential direction. That is, since it is possible to prevent only the rolling elements arranged in a predetermined direction from coming into contact with the chamfered portion, it is possible to prevent the moving unit from tilting in a specific direction with respect to the fixed shaft, and It can be smoothly moved up and down along the fixed axis.

Further, when the moving shaft tries to rotate with respect to the connecting elevating/lowering member, the moving shaft side chamfer contacts the moving shaft side rolling element to prevent relative rotation of the moving shaft. As a result, relative rotation of the connecting elevating member with the moving shaft as the center of rotation can be prevented, and the position of the patient support unit connected to the moving shaft in the orthogonal plane orthogonal to the vertical direction is fixed to move in the vertical direction. Can be raised and lowered. In other words, the target site does not move back and forth and left and right every time the patient is moved up and down, and it is not necessary to perform delicate position adjustment for each procedure. Therefore, the practitioner can smoothly perform the treatment without stress.

Further, the fixed shaft side rolling element abutting on the fixed shaft side chamfer and the moving shaft side rolling element abutting on the moving shaft side chamfer can be brought close to each other without interfering with each other, and the lifting device is installed. It is possible to further reduce the area and secure a space around the lifting device.

As also aspects of the invention, the fixed shaft side rolling elements that roll rotation axis as the center of rotation, it comprises a rotary axis adjusting mechanism for moving the rotary shaft in a direction close to and away from relative to said stationary shaft side chamfer You can
The rotation axis adjustment mechanism, for example, a configuration in which the axial direction of the support shaft for supporting the stationary shaft side rolling element and the rotary shaft does not coincide, the axis of rotation of said stationary shaft side rolling element to the chamfer direction A configuration having a movable mechanism is included. The rotating shaft adjusting mechanism includes a case where the rotating shaft adjusting mechanism is provided integrally with the fixed shaft side rolling element or as a separate component.

This invention makes it possible to reliably abut the stationary shaft side rolling member to said stationary shaft side chamfer.
For example, when the moving unit is arranged along the fixed shaft, the moving unit may slightly tilt, and the guided portion may slightly approach or separate from the fixed shaft. In this case, it idles the fixed shaft side rolling element relative to the fixed shaft side chamfer without contact, the mobile unit may not be accurately lift.

In contrast, the the fixed shaft side rolling element, by providing the rotation axis adjustment mechanism for moving the rotary shaft in a direction close to and away from relative to said stationary shaft side chamfered portion, the object of the stationary shaft side rolling element is moved away or close to the guide portion can be contacted with said stationary shaft side rolling element and the fixed shaft side chamfer. Thereby, the moving unit can be reliably moved up and down along the fixed shaft.

Further, as an aspect of the present invention, the drive unit includes a first drive unit that raises and lowers the connecting elevating member with respect to the fixed shaft, and a second drive unit that raises and lowers the moving shaft with respect to the connecting elevating member. It can be characterized as configured.
The first drive unit and the second drive unit include a case where the drive units have the same or different power sources, and a case where the first drive units and the second drive units have the same or different sizes.

According to this invention, the lifting device can be downsized.
For example, when the first drive unit and the second drive unit are the same drive unit, the stroke of each drive unit can be half that in the case where there is one drive unit. That is, the height of the lifting device in a state where the first drive unit and the second drive unit are contracted can be halved as compared with the case where the drive unit is one, and when the drive unit is one. In comparison, the sizes of the first driving unit and the second driving unit can be reduced in the vertical direction.

Further, as described above, the strokes of the first drive unit and the second drive unit can be halved as compared with the case where the number of the drive unit is one, so that when a force acts in the direction intersecting the fixed axis. Even if there is, it is possible to reduce the torque acting on the first drive unit and the second drive unit. Therefore, the member strength of each drive unit can be reduced. From this, it is possible to increase the choices of members used for the first drive unit and the second drive unit, and it is possible to achieve weight reduction and cost reduction.

Further, as an aspect of the present invention, the above-mentioned lifting device is provided, and the patient support part is constituted by a seat support part to which a seat on which the patient sits is fixed, and the first drive part and the second drive part. Can be arranged along the width direction of the seat support portion.

According to the present invention, the above-mentioned lifting device can be reduced in size with respect to the depth direction of the seat support portion, and a space in the depth direction below the seat support portion can be secured. Thereby, for example, the practitioner can place his/her foot in the space, and can approach the patient who is the subject of the treatment without taking an unnatural posture. In other words, it is possible to take a position in which it is easy to perform the treatment at a position close to the patient, and it is possible to perform the treatment reliably and smoothly.

Further, as an aspect of the present invention, the moving shaft-side rolling element can include a rotating shaft adjusting mechanism that moves the rotating shaft in a direction in which the rotating shaft approaches and separates from the moving shaft chamfer.
The rotary shaft adjusting mechanism, like the fixed shaft side adjusting mechanism, a configuration in which the support shaft supporting the moving shaft side rolling element and the rotating shaft of the moving shaft side rolling element are not arranged in the same straight line, The configuration includes a moving mechanism that simply moves the rotating shaft of the moving shaft side rolling element toward the moving shaft chamfer.

According to the present invention, the moving shaft side rolling element can be moved away from or close to the moving shaft according to the approaching or moving away of the guide portion from the moving shaft, so that the moving shaft side chamfer and the moving shaft side rolling element can be reliably contacted with each other. The movable shaft can be stably moved up and down along the guide portion by contacting with each other.

Further, as an aspect of the present invention, the first drive unit and the second drive unit are configured by hydraulic cylinders of the same thrust that exert the same thrust with respect to the same pressure, and the first drive unit and the second drive unit. One hydraulic pump is provided for the second drive unit, and hydraulic pressure can be applied to both the first drive unit and the second drive unit configured by the hydraulic cylinder.

According to the present invention, the first drive unit and the second drive unit can be easily controlled, and both the first drive unit and the second drive unit can be simultaneously driven, so that the load is remarkably increased on one side. Unbiased can be prevented. The hydraulic cylinder may be a compact hydraulic cylinder having the same thrust.

Also, if the hydraulic pipe connected to the hydraulic pump is branched and connected to the first drive unit and the second drive unit, the height of the patient support unit may be increased regardless of the position of the connecting elevating member. It can be kept constant and the stability of the patient position can be ensured.

More specifically, for example, when the first drive unit and the second drive unit are respectively connected to different hydraulic pumps, the connecting elevating member is unintentionally lowered, that is, the pressure of the first drive unit is When the number is decreased, the patient support part is lowered by the distance that the connecting elevating member is lowered.

On the other hand, when the hydraulic pipe of one hydraulic pump is branched and connected to the first drive unit and the second drive unit, the pressure of the hydraulic pump is set to the first drive unit and the second drive unit. Therefore, when the pressure of the first drive unit is reduced, the pressure of the second drive unit is increased by the reduced pressure. Therefore, due to the pressure reduction of the first drive unit, the patient support unit connected to the second drive unit is raised by the amount by which the connecting elevating member is lowered, and the height of the patient support unit can be maintained.

Thus, even if the height of the connecting elevating member is unintentionally changed, the height of the patient support does not change, so that the patient does not unintentionally move up and down, and the treatment is performed. The height of the position can be reliably ensured.

Further, as an aspect of the present invention, it is possible to provide a synchronizing mechanism that synchronizes the raising and lowering of the connecting elevating member with respect to the fixed shaft and the raising and lowering of the moving shaft with respect to the connecting elevating member.
The synchronization mechanism is an adjustment mechanism that adjusts the vertical movement distance of the movable shaft with respect to the connection lifting member according to the vertical movement distance of the connection lifting member with respect to the fixed shaft. In other words, it refers to a mechanism that makes the stroke of the first drive unit and the stroke of the second drive unit substantially the same.

According to the present invention, even when the external force acting on the first drive unit and the external force acting on the second drive unit are different, the first drive unit and the second drive unit can be simultaneously driven with substantially the same stroke. it can.
More specifically, for example, when controlling the first drive unit and the second drive unit configured by the same drive unit by a hydraulic pump, the pressure acting on the first drive unit and the second drive unit When the acting pressure is different, the strokes of the first drive unit and the second drive unit are different, but by providing the synchronization mechanism, the stroke of the first drive unit and the second drive unit One drive can be raised so that the amounts are the same. Thereby, since the first drive unit or the second drive unit can be driven equally, it is possible to prevent the durability of only one of the first drive unit and the second drive unit from being deteriorated.

Further, as an aspect of the present invention, the synchronizing mechanism includes a gear rotatably provided on the connecting elevating member, one end side fixed to the fixed shaft and the other end side fixed to the moving shaft, and meshed with the gear. It can be configured with a cord body.
The cord body is a flexible member that has a predetermined hardness and can be bent and folded, and includes, for example, a chain, a wire, a resin wire, or the like.

According to the present invention, the raising and lowering of the connecting elevating member with respect to the fixed shaft and the raising and lowering of the moving shaft with respect to the connecting elevating member can be reliably synchronized with a simple configuration. In addition, compared to a case where, by using a complicated structure such as an electronic mechanism, the elevating and lowering of the connecting elevating member with respect to the fixed shaft and the elevating and lowering of the moving shaft with respect to the connecting elevating member are simple and stable. It is possible to achieve the vertical movement.

In addition, as an aspect of the present invention, it is possible to provide an elevating position detecting mechanism that detects elevating the connecting elevating member with respect to the fixed shaft.
The elevating position detecting mechanism is a mechanism that detects a position where the connecting elevating member moves up and down with respect to the fixed shaft by elevating the first driving unit, and detects a moving distance of the connecting elevating member with respect to the fixed shaft. And detecting the position of the connecting elevating member, detecting the absolute position of the connecting elevating member, detecting the position of a member attached to a predetermined position of the connecting member, and the like.

Specifically, by using a detection mechanism that detects the position of the connecting elevating member by detecting the number of rotations of a rotating member that rotates according to the elevating of the connecting elevating member, or light such as laser light or infrared light. It includes a detection mechanism that optically detects the vertical movement of the connecting elevating member with respect to the fixed shaft, a detection mechanism that detects the three-dimensional position of the connecting elevating member, and the like.

According to the present invention, the position of the connecting elevating member with respect to the fixed shaft can be accurately grasped. For example, when the connecting elevating member is at a position higher or lower than a predetermined position, a separate notification is provided. It is possible to prevent the connection elevating member and the patient supporting member from interfering with other members such as a board by making a notification by a section or the like.

Further, by feeding back the position of the connecting elevating member detected by the elevating position detecting mechanism as information, for example, the practitioner may drive the first drive unit or the like so as to be arranged at a desired position. Instead, it can be grasped that the connecting elevating member has not reached the desired position, and it can be grasped whether the elevating member is normally moved up and down.

Further, as an aspect of the present invention, the elevating position detecting mechanism is fixed to the connecting elevating member and extends vertically, and a pinion that is rotatably fixed to the fixed shaft and meshed with the rack. And a potentiometer for detecting the rotation speed of the pinion.

According to the present invention, the number of rotations of the pinion engaged with the rack fixed to the connecting elevating member can be reliably detected, so that the position of the connecting elevating member can be easily and reliably detected.

According to the present invention, it is possible to provide an elevating device and a medical examination table capable of stably elevating and lowering the patient support part.

The schematic side view of the medical examination table. The schematic perspective view of a lifting device. Explanatory drawing of a shaft part. The schematic perspective view of a hydraulic drive part. Explanatory drawing about the general shape of a raising/lowering member. Side view and plan view of the lifting member Explanatory drawing of a bearing and a support member. Explanatory drawing of a synchronization mechanism and a position detection mechanism. Explanatory drawing about assembling of a lifting device. Explanatory drawing regarding contact between a chamfered portion and a bearing. Explanatory drawing about attachment of a synchronization mechanism and a position detection mechanism. Explanatory drawing of the synchronizing mechanism with respect to the raising/lowering operation of a raising/lowering apparatus. Explanatory drawing about the raising/lowering operation of a raising/lowering apparatus. Explanatory drawing of the arrangement position of the raising/lowering apparatus in a medical examination table.

Hereinafter, the elevating device 1 and the medical examination apparatus 900 including the elevating device 1 will be described with reference to FIGS. 1 to 13.
FIG. 1 shows a schematic side view of a medical examination apparatus 900, and FIG. 2 shows a schematic perspective view of an elevating device 1 included in the medical examination apparatus 900 as viewed from the front right front side. Here, in FIG. 1, the vertical direction is the height direction H and the horizontal direction is the longitudinal direction L. The longitudinal direction L refers to the axial direction of the patient on the medical examination apparatus 900 that continues from the headrest 913 of the medical examination apparatus 900 to the backrest 912 and the leg rest 914.

In addition, in FIG. 2, the vertical direction is combined with FIG. 1 to be a height direction H, and the direction from the left front side to the right back side is a longitudinal direction L in FIG. The direction from the front right to the back left, that is, the direction orthogonal to the longitudinal direction L and the height direction H of the medical examination table 910 is defined as the width direction W of the medical examination table 910.
Further, in FIG. 2, the upper side in the height direction H is +H side, the lower height direction is −H side, the left front side in the longitudinal direction L is +L side, the right back side is −L side, and the right front side in the width direction W is. The +W side and the left back side are the −W side.

FIG. 3 is an explanatory view of the shaft portion 10 that constitutes the lifting device 1 and functions as a rotation blocking member. More specifically, FIG. 3A is a schematic perspective view of the shaft portion 10 viewed from the upper left rear side, FIG. 3B is a plan view of the shaft portion 10, and FIG. FIG. 6 is a plan view showing a method of manufacturing the moving shaft 13. In FIG. 3B, the seat support portion 14 is shown by a dotted line to be in a transparent state, and the planar shape of the moving shaft 13 is clearly shown.
FIG. 4 is an explanatory view of the hydraulic drive unit 20, and more specifically, FIG. 4A shows a schematic perspective view of the hydraulic drive unit 20 as viewed from the upper left rear side, and FIG. The schematic perspective view of the state where the piston rod 32 was pushed out from the cylinder 31 of the cylinder 30 is shown.

FIG. 5 is a schematic perspective view of the elevating member 40 that ascends and descends along the fixed shaft 12 in the elevating device 1 shown in FIG. 2, and FIG. 6 is an explanatory view showing the configuration of the elevating member 40. Specifically, FIG. 5A shows a schematic perspective view of the elevating member 40 seen from the front right upper side, and FIG. 5B shows a schematic perspective view of the elevating member 40 seen from the upper left rear side. 6A shows a side view of the elevating member 40 viewed from the +L side, and FIG. 6B shows a plan view of the elevating member 40.

FIG. 7 shows an explanatory view of the bearing 50 and the support shaft 60. Specifically, FIGS. 7A and 7B show the lifting member in FIG. 6A with the support shaft 60 taken out. 40 is a sectional view taken along the line AA and a sectional view taken along the line BB of FIG. 40. FIG. 7C shows a side view of the support mechanism-equipped support shaft 62, and FIG. 7D and FIG. The CC sectional view and DD sectional view in c) are shown. FIG. 8 is an explanatory diagram of the configurations of the synchronizer 70 and the position detector 80. Specifically, FIG. 8A shows a schematic perspective view of the synchronizer 70 and the position detector 80, and FIG. 8B shows a side view of the synchronizer 70 viewed from the +L side.

FIG. 9 is an exploded schematic perspective view of the lifting device 1 for explaining the assembling of each component of the lifting device 1, and FIG. 10 is a view for surely bringing the bearing 50 into contact with the fixed shaft side chamfer 121. An explanatory view is shown. Specifically, FIG. 10A shows a plan view of the lifting device 1 in a state where the bearing 50 is in contact with the fixed shaft 12, and FIG. 10B shows a sectional view taken along line EE in FIG. 10A. 10(c) is an enlarged sectional view of the bearing 50 in a state where it is not in contact with the fixed shaft 12, and FIG. 10(d) is an enlarged sectional view of the bearing 50 in a state in which it is in contact with the fixed shaft 12. Show. Note that, in FIG. 10, in order to clarify the positional relationship between the bearing 50 and the fixed shaft 12, the illustration of the configuration other than the base 11, the fixed shaft 12, the bearing 50, and the support shaft 60 is omitted.

FIG. 11 is a schematic perspective view of the lifting device 1 for explaining the assembling of the synchronization device 70 and the position detector 80 to the lifting device 1, and FIG. 12 is a +L side for explaining the lifting operation of the lifting device 1. The side view of the raising/lowering apparatus 1 seen from the -L side is shown typically. Specifically, FIGS. 12(a1) and 12(a2) show side views of the lifting device 1 when the hydraulic drive unit 20 is contracted, as seen from the +L side and the −L side, and FIG. FIG. 12B2 is a side view of the lifting device 1 viewed from the +L side and the −L side in the lifting state, and FIGS. 12C1 and 12C2 show a state in which the hydraulic drive unit 20 is fully extended. The side view which looked at the raising/lowering apparatus 1 from +L side and -L side in FIG.

FIG. 13 is an explanatory view showing the operation of the synchronizing device 70 in the lifting operation of the lifting device 1, and more specifically, FIG. 13A is a side view of the lifting device 1 and the synchronizing device 70 in a state in which the hydraulic drive unit 20 is contracted. 13(b) is a side view of the lifting device 1 and the synchronizing device 70 in the middle of lifting, and FIG. 13(c) is a side view of the lifting device 1 and the synchronizing device 70 in the lifting state. FIG. 14 is a plan view showing the positional relationship of the lifting device 1 on the medical examination table 910.

First, an overview of the medical examination apparatus 900 will be described.
As shown in FIG. 1, the medical examination apparatus 900 includes a medical examination table 910 for supporting a patient, an elevating base 920 provided under the medical examination table 910, and elevating the medical examination table 910. It is composed of a foot controller 930 to be operated, a basin 940, and an illumination support unit 950 equipped with a surgical light and a microscope for examining the inside of the oral cavity.

The medical examination table 910 includes a seat 911 on which a patient sits, a backrest 912 that can be tilted with respect to the seat 911, a headrest 913 provided at the +L side tip of the backrest 912, and the opposite side of the headrest 913. It is configured with a leg rest 914 tilted with respect to a seat 911 provided on the (-L side).

The elevating base 920 is an elevating mechanism that allows a practitioner to step up and down the foot controller 930 to elevate and lower the medical examination table 910, and the elevating device 1 is installed inside. Although various devices other than the lifting device 1 are installed inside the lifting base 920, description thereof will be omitted here.

As shown in FIG. 2, the lifting device 1 is formed in a substantially rectangular parallelepiped shape that is long in the height direction H as a whole, and has a shaft portion 10 serving as a base and a hydraulic drive portion arranged along the width direction W. 20, a lifting/lowering member 40 that moves up and down along the shaft 10, a synchronizing device 70, and a position detector 80.

As shown in FIG. 3, the shaft portion 10 that constitutes the lifting device 1 includes a flat base 11 that serves as a base when the lifting device 1 is placed, and a fixed shaft 12 that is fixed to the base. The movable shaft 13 is erected parallel to the fixed shaft in the width direction W, and the seat support portion 14 is fixed to the upper end of the movable shaft 13.

As shown in FIGS. 3(a) and 3(b), the base 11 is a rectangular flat plate that is longer in the longitudinal direction L than in the width direction W, and the fixed shaft 12 is fixed to the substantially central portion. It has a fixed part for the fixed shaft (not shown). In addition, a +W side end of the fixed shaft fixing portion is provided with a moving shaft arranging portion 111 which is slightly recessed in an arc shape, and a hydraulic driving portion 20A described later is provided in the −L side central portion of the base 11. The 1st cylinder arrangement part 112 to arrange is provided.
The first cylinder arranging portion 112 is a through hole penetrating in the plate thickness direction of the base 11, and has an arcuate opening portion that is opened obliquely downward in plan view.

The fixed shaft 12 is a substantially quadrangular columnar body having a height 1 and fixed to a fixed shaft fixing portion provided on the base 11, and as shown in FIGS. 3(a) and 3(b), the fixed shaft 12 is The outer peripheral surface of 12 has a configuration in which the fixed shaft chamfered portions 121 chamfered along the height direction H in the circumferential direction are arranged at four positions so as to be at equal intervals.

As shown in FIG. 3C, such a fixed shaft 12 has an outer peripheral surface of a solid cylindrical body 12x having a height of 1 with one side shorter than the diameter of the bottom surface of the cylindrical body 12x and a diagonal line having a cylindrical shape. The fixed shaft side chamfered portion 121 having a flat surface portion is formed by chamfering the arc portion 12k along the height direction H at the position of each side of the square 12s longer than the diameter of the bottom surface of 12x. As a processing method for forming the fixed shaft side chamfered portion 121, cutting, polishing, forging, grinding, forging or the like can be used. Further, the fixed shaft side chamfered portion 121 is hardened to improve hardness and wear resistance, tensile strength, fatigue strength and the like.

In the present embodiment, the fixed shaft side chamfered portion 121 is formed by the above-mentioned method, but it is not always necessary to use this method, and for example, the corner portion of a quadrangular prism may be formed by chamfering in an arc shape. Good. Further, it is not necessary to quench the fixed shaft side chamfer 121.

The moving shaft 13 is a columnar body arranged in parallel with the fixed shaft 12 along the width direction W, and has the same shape as the fixed shaft 12. That is, the moving shaft 13 is formed with the moving shaft chamfer 131.
Here, the moving shaft side chamfered portion 131 and the fixed shaft side chamfered portion 121 are arranged so as to face each other at an angle of 45 degrees. That is, the fixed shaft chamfer 121 and the movable shaft chamfer 131 do not face each other (see FIG. 3B).

The seat support portion 14 corresponding to the patient support portion is for connecting and fixing the seat 911, and is a flat plate-like support plate connected to the upper end surface of the moving shaft 13.
The seat support portion 14 extends in the -W direction from the -W side end portion of the home base type flat plate 141 and the +L side portion of the home base type flat plate 141 that is convex toward the -L side in plan view. It is a single plate composed of a square plate 142 having a square shape.

It should be noted that one side of the square plate 142 is approximately half the length of one side of the home base type flat plate 141. Further, the −L side joint portion between the home base type flat plate 141 and the square plate 142 is configured by a fixed shaft avoiding portion 143 formed in an arc shape having substantially the same diameter as the fixed shaft 12, and the − of the home base type flat plate 141 is −. A piston fixing hole 144 for fixing a bolt to a piston side connecting portion 321B provided at the upper end of a piston rod 32, which will be described later, is provided in the center portion on the tip side on the L side.

As shown in FIG. 3A, in the shaft portion 10 having such a configuration, the fixed shaft 12 fixed to the base 11 and the moving shaft 13 that fixes the seat support portion 14 to the upper end are arranged in the width direction W. Are arranged in parallel along. Further, the upper end portion of the fixed shaft 12 is arranged along the fixed shaft avoiding portion 143, and the lower end portion of the moving shaft 13 is arranged along the moving shaft arrangement portion 111.

As shown in FIG. 4, the hydraulic drive unit 20 arranged along the width direction W with respect to the shaft portion 10 has two hydraulic cylinders 30 arranged in parallel along the width direction W (arranged on the −W side). Hydraulic cylinder 30A and hydraulic cylinder 30B arranged on the +W side, flexible connecting pipe 21 connecting hydraulic cylinders 30A and 30B, pump tube 22 connecting to connecting pipe 21, and pump tube 22 And a hydraulic pump 23 connected to the.

The hydraulic cylinder 30 includes a cylindrical cylinder 31, a piston rod 32 housed inside the cylinder 31, and a supply port 33 that supplies lifting oil to the inside of the cylinder 31 at the lower end side of the cylinder 31. There is.
The cylinder 31 is a cylinder case of a cylindrical body that can accommodate the piston rod 32 and is slightly longer than the height l, and is a tank for lifting oil that is internally refilled and drained through the supply port 33. (Not shown) is provided.

The piston rod 32 is a columnar body having a diameter smaller than that of the cylinder 31 and a height of l, and a piston-side connecting portion 321 for connecting to another member is provided at an upper end portion of the piston rod 32.
The supply port 33 is an oil supply port for supplying or removing lifting oil from a hydraulic pump to a tank provided inside the cylinder 31.

As described above, the two hydraulic cylinders 30A and 30B arranged in parallel are connected via the connecting pipe 21 connected to the supply port 33, and the pump tube 22 connected to the supply port 33A provided in the hydraulic cylinder 30A is connected. It is connected to one hydraulic pump 23 via the. The hydraulic pump 23 is connected to the foot controller 930. That is, the hydraulic pump 23 can be controlled by stepping on the foot controller 930.

As described above, in the hydraulic drive unit 20, the lifting oil is supplied or drained through the supply port 33 connected to the hydraulic pump 23 by the depression operation of the foot controller 930, and the cylinder 31 is driven by the hydraulic pressure of the lifting oil. The piston rod 32 stored in can be moved up and down.

Since the hydraulic cylinders 30A and 30B are connected to the single hydraulic pump 23, both the hydraulic cylinders 30A and 30B can be controlled simultaneously by controlling the single hydraulic pump 23.

As shown in FIGS. 5 to 7, the elevating member 40 corresponding to the connecting elevating member includes an octagonal prism-shaped fixed shaft side elevating part 41 and a moving shaft side elevating part 46 which are formed in a substantially octagonal shape in a plan view. It is configured to be connected to. The fixed shaft side elevating part 41 and the moving shaft side elevating part 46 are juxtaposed along the width direction W and are displaced in the height direction H, that is, at the upper part of the elevating member 40, the moving shaft side elevating part 46. However, the fixed shaft side elevating part 41 is connected and arranged in the lower part, and eight bearings 50 are respectively attached to the fixed shaft side elevating part 41 and the moving shaft side elevating part 46 via the support shaft 60. Has been.

The moving unit corresponds to a component including the moving shaft 13 that connects the seat support portion 14 to the upper end surface and the elevating member 40. That is, the moving unit is configured to be moved up and down by the hydraulic cylinder 30A. In other words, in the present embodiment, a lifting device that uses two hydraulic cylinders 30A and 30B to perform two-stage lifting is used. However, for example, the lifting member 40 that does not include the moving shaft 13 and to which the seat support 14 is fixed has one hydraulic pressure. The lifting device may be a single-step lifting device that lifts and lowers only by the cylinder 30A.

Hereinafter, the elevating member 40, the bearing 50, and the support shaft 60 will be described in detail with reference to FIGS. 5 to 7.
The fixed shaft-side elevating part 41 arranged below the moving shaft-side elevating part 46 has a substantially regular octagonal bottom surface and a height of about half of the fixed shaft 12 (height l/2). In the central portion, a fixed shaft guided portion 411 formed of a cylindrical through hole having substantially the same diameter as the cylindrical body 12x is provided along the height direction H.

Further, among the outer peripheral surfaces forming the fixed shaft side elevating portion 41, a surface inclined by 45 degrees with respect to the longitudinal direction L (hereinafter referred to as “first odd outer peripheral surface 412”) is fixed shaft guided portion. Two bearing assembly parts 42 penetrating toward 411 are provided side by side along the height direction H (see FIG. 5 ). In other words, the fixed shaft side elevating part 41 has a bearing assembly part 42 penetrating toward the fixed shaft guided part 411 and two bearing assembly parts 42 arranged in parallel in the height direction H. Four are provided at equal intervals in the direction.
The bearing assembly portion 42 is a through hole that penetrates a part of the first odd-numbered outer peripheral surface 412 toward the fixed shaft guided portion 411, and is a space portion for mounting the bearing 50 described later.

On the other hand, the first even outer peripheral surface 413 (the surface orthogonal to the longitudinal direction L or the width direction W) not provided with the bearing assembly portion 42 penetrates along the adjacent first odd outer peripheral surface 412. The support shaft fixing holes 43 are provided by the number corresponding to the bearing assembly portion 42. That is, two support shaft fixing holes 43 penetrating in the direction inclined by 45 degrees with respect to the longitudinal direction L are formed side by side in the first odd outer peripheral surface 412 along the height direction (FIG. 5 ). And FIG. 7B).

In addition, the first even-numbered outer peripheral surface 413a of the first even-numbered outer peripheral surface 413 forming the fixed shaft-side elevating part 41 has the first even-numbered outer peripheral surface 413a formed with the first cylinder fixing auxiliary portion 44 on the +W side. Fixed-axis guide assisting portions 45 are provided on the first even outer peripheral surface 413b (see FIGS. 5A and 5B).

As shown in FIG. 5B, the first cylinder fixing auxiliary portion 44 is formed by recessing the first even outer peripheral surface 413a toward the fixed shaft guided portion 411.
As shown in FIG. 5A, the fixed shaft guide assisting portion 45 includes an auxiliary arcuate surface 451 that is recessed in an arcuate shape having the same diameter as the cylindrical body 12x, and an end portion on the −L side of the first even outer peripheral surface 413b. It is configured with a first protruding wall 452 protruding in the +W direction.

Similar to the fixed shaft side elevating part 41, the bottom surface of the moving shaft side elevating part 46 arranged above the fixed shaft side elevating part 41 is a substantially octagonal shape, and the height is about half that of the moving shaft 13 (height. (1/2) is a substantially regular octagonal prism, and a moving shaft guide portion 461, which is a through hole having a diameter substantially the same as that of the cylindrical body 12x, is provided in the central portion in the height direction H.

Further, among the outer peripheral surfaces forming the moving shaft-side elevating portion 46, the moving shaft guide portions 461 are respectively formed on the surfaces inclined by 45 degrees with respect to the longitudinal direction L (hereinafter, referred to as “second odd outer peripheral surface 462 ”). Two bearing assembling portions 42 are provided side by side in the height direction H (see FIGS. 5 and 6). In other words, the moving shaft side elevating part 46 is provided with four bearing assembly parts 42 penetrating toward the moving shaft guide part 461 at equal intervals in the outer peripheral direction, and two sets are arranged in parallel in the height direction H. Is provided.

On the other hand, the second even outer peripheral surface 463 (the surface orthogonal to the longitudinal direction L or the width direction W) where the bearing assembly portion 42 is not provided penetrates along the adjacent second odd outer peripheral surface 462. The support shaft fixing holes 43 are provided by the number corresponding to the bearing assembly portion 42. That is, the second odd-numbered outer peripheral surface 462 is provided with two support shaft fixing holes 43 penetrating in the direction inclined by 45 degrees with respect to the longitudinal direction L along the height direction H (FIG. 5 and FIG. 6A and FIG. 7A).

A second cylinder fixing portion 47 for fixing the hydraulic cylinder 30B is provided on the second even outer peripheral surface 463a formed on the −L side of the second even outer peripheral surface 463.
More specifically, as shown in FIGS. 5B and 6B, the second cylinder fixing portion 47 is a second cylinder in which the second even outer peripheral surface 463a formed on the −L side is recessed inward. The recessed portion 471 and a pair of second projecting walls 472 projecting in the −L direction from the end portion of the second even-numbered outer peripheral surface 463a in the width direction W are concave recesses of the second projecting wall 472. The wall surface is provided with a cylinder fixing hole 473 for fixing the hydraulic cylinder 30B by bolts.

Further, a first cylinder connecting portion 48 protruding toward the -W side is formed on an upper part of the second even-numbered outer peripheral surface 463a provided on the -L side of the second even-numbered outer peripheral surface 463.
The first cylinder connecting portion 48 is a plate-like first cylinder fixing plate 481 that is formed flush with the upper end surface of the moving shaft side elevating portion 46, and extends downward from the +L side end portion of the first cylinder fixing plate 481. It is configured with the lowered first cylinder auxiliary surface 482 (see FIGS. 5B and 6B), and the piston side connection portion 321A of the hydraulic cylinder 30A is provided on the lower end surface of the first cylinder fixing plate 481. A first rod fixing portion for fixing is provided (not shown). The lower end portion of the first cylinder auxiliary surface 482 is connected to the first even outer peripheral surface 413a and is flush with it.

A fixed shaft movement assisting portion 49 is formed on the second even outer peripheral surface 463b formed on the −W side of the second even outer peripheral surface 463.
More specifically, the fixed-axis movement assisting portion 49 includes an arc-shaped recess 491 formed by recessing the second odd-number outer peripheral surface 462b in an arc shape having substantially the same diameter as the cylindrical body 12x, and an end portion of the arc-shaped recess 491 on the −L side. It is configured by a guided first auxiliary wall 492 protruding in the −W direction and a guided second auxiliary wall 493 protruding in the −W direction from the +L side end of the arc-shaped recess 491.
Note that the guided first auxiliary wall 492 is the same as the first cylinder auxiliary surface 482, and the lower end of the guided second auxiliary wall 493 is similar to the first cylinder auxiliary surface 482 on the first even outer peripheral surface 413a. It is configured integrally with the upper end (see FIG. 5(b)).

The bearing assembly part 42 formed on the elevating member 40 (the fixed shaft side elevating part 41 and the moving shaft side elevating part 46) having such a configuration has a rotation surface slightly inside the fixed shaft guided part 411. The protruding bearing 50 is arranged, and the bearing 50 is assembled to the elevating member 40 by fitting the support shaft 60 penetrating the inner peripheral surface of the bearing 50 into the support shaft fixing hole 43 (see FIG. 7). ..

As shown in FIG. 7, the support shaft fixing hole 43 has a cylindrical first through hole 431 that horizontally penetrates the first odd outer peripheral surface 412a and the second odd outer peripheral surface 462a formed on the −L side. , And the second odd-numbered outer peripheral surface 412b and the second odd-numbered outer peripheral surface 462b formed on the +L side in the horizontal direction. A simple support shaft 61 described later is inserted into the first through hole 431, and a support mechanism-equipped support shaft 62 described below is inserted into the second through hole 432.

The bearing 50 is composed of an annular outer ring that constitutes a rotation surface, an annular inner ring that has the same center of rotation as the outer ring, and a spherical rotating body that is provided between the outer ring and the inner ring (not shown). ), a so-called rotary ball bearing.
The inner peripheral surface of the bearing 50 is formed to have substantially the same diameter as the support shaft fixing hole 43.

The support shaft 60 is a support rod that penetrates the inner peripheral surface of the bearing 50, and penetrates the first through hole 431 that penetrates the first odd outer peripheral surface 412a and the second odd outer peripheral surface 462a formed on the −L side. The cylindrical simple support shaft 61 for supporting the bearing 50 and the second through hole 432 provided in the first even outer peripheral surface 413b and the second even outer peripheral surface 463b formed on the +L side to penetrate the bearing 50. And a support shaft 62 with a substantially cylindrical moving mechanism for supporting

The simple support shaft 61 includes a simple support shaft body 611, which is a cylindrical body having the same diameter as the bearing 50, and a retaining diameter slightly larger than that of the simple support shaft body 611 provided on one end side end surface of the simple support shaft body 611. And part 612.

On the other hand, as shown in FIG. 7C, the support mechanism-equipped support shaft 62 has a substantially cylindrical support shaft insertion portion 621 formed at one end side, and a cylindrical bearing fitting arranged in the central portion. The portion 622 and the substantially cylindrical support shaft fixing portion 623 formed on the other end side are integrally configured.

The support shaft insertion portion 621 is a columnar body having a diameter slightly smaller than that of the bearing 50, one end side is tapered, and a bolt hole into which a fixing bolt 625 can be assembled is provided at the one end side end portion (illustration). abridgement).
The bearing fitting portion 622 is a cylindrical body having the same diameter as the inner peripheral surface of the bearing 50, and the other end side is integrally connected to the support shaft fixing portion 623.

The support shaft fixing portion 623 is a columnar body having a diameter larger than that of the bearing fitting portion 622 and having a recess in the inner diameter direction at the central portion, and the end face on the other end side is used for rotation adjustment using a screwdriver. Is provided with a cross groove 624, and the bearing 50 fitted with the bearing fitting portion 622 is rotated by rotating the support mechanism-equipped support shaft 62 around the central axis m of the support shaft fixing hole 43 with a driver. be able to.
It should be noted that the cross groove 624 does not have to be for using a screwdriver, but may be a hexagonal hole for fitting a hexagonal wrench.

7D is a cross-sectional view of the support shaft fixing portion 623 of the moving mechanism supporting shaft 62 taken along the line CC, and FIG. 7E is a bearing fitting portion of the moving mechanism supporting shaft 62. 622 is a cross-sectional view taken along the line DD of FIG.
As shown in FIGS. 7C, 7D, and 7E, the moving mechanism-equipped support shaft 62 configured as described above includes a rotation shaft c1 having a circular cross section of the bearing fitting portion 622, and The support shaft insertion portion 621 and the support shaft fixing portion 623 are not arranged on the same line as the central axis m (axial center), but are slightly eccentric upward. That is, the rotation axis of the bearing 50 is slightly different from the axial direction of the support shaft insertion portion 621 and the support shaft fixing portion 623.

Therefore, by rotating the support mechanism-equipped support shaft 62 around the central axis m of the support shaft fixing hole 43, the bearing 50 can be adjusted toward or away from the fixed shaft 12. .. The details of the movement adjustment mechanism of the bearing will be described later.

As shown in FIG. 8, the synchronizing device 70 provided at the end on the −W side of the lifting device 1 is fixed to the base 11 and a plate-shaped synchronizing base 71 fixed to the lifting member 40. The reference portion 72, the lifting portion 73 fixed to the seat support portion 14, the first gear 74 rotatably fixed to the upper portion of the synchronous base portion 71, and the rotatably fixed to the lower portion of the synchronous base portion 71. A second gear 75, a first chain 76 having one end fixed to the reference portion 72 and meshing with the first gear 74, and one end fixed to the elevating portion 73 and meshing with the second gear 75. The second chain 77 is installed.

As shown in FIG. 8A, the synchronization base portion 71 is a plate-like body provided along the height direction H and the width direction W, and via the synchronization base portion fixing portion 71a provided at the -W side upper part. And is fixed to the lifting member 40.

The reference portion 72 fixed to the base 11 is a plate-like member having a shape in which an L-shape is vertically inverted as shown in FIGS. 8A and 8B, and is formed on the upper portion as described above. One end of one chain 76 is fixed. Since the reference portion 72 is fixed to the base 11, it is indirectly fixed to the fixed shaft 12.

The elevating part 73 is a plate-like body in which the L-shape is reversed left and right, and one end side of the second chain 77 is fixed to the lower part of the elevating part 73. It should be noted that a fixing part for fixing the elevating part 73 to the seat supporting part 14 is not shown.

The first gear 74 and the second gear 75 are gears that are rotatable around a direction along the longitudinal direction L as a rotation axis and are fixed to the synchronous base portion 71, and the first chain 76 and the second chain 77 respectively. It is in mesh. The first gear 74 and the second gear 75 are arranged along the height direction H at a predetermined interval.

The first chain 76 is a chain that is slightly longer than the distance between the first gear 74 and the second gear 75, meshes with the upper portion of the first gear 74, and has one end on the reference part 72 and the other end on the elevating part 73. It is fixed to.

On the other hand, the second chain 77 is a chain having substantially the same length as the first chain 76, meshes with the lower portion of the second gear 75, and has one end side fixed to the elevating part 73 and the other end side fixed to the reference part 72. .. That is, the first chain 76 and the second chain 77 are fixed to the reference part 72 and the elevating part 73 and are formed in a ring shape.

As shown in FIG. 8A, the position detector 80 that detects the position of the elevating member 40 is a plate-like position detecting device that protrudes to the +W side from the −L side end surface of the synchronization base 71 fixed to the elevating member 40. The base 81, a rack 82 provided in the central portion of the position detection base 81, a pinion 83 that meshes with the rack 82 and is rotatably fixed to the base 11, and a rotation of the pinion 83 that is axially coupled to the pinion 83. It is composed of a potentiometer 84 fixed to the base 11 for detecting the number.

Assembling of the lifting device 1 configured by combining the above-described configurations will be briefly described with reference to FIGS. 9 to 11.
First, as shown in FIG. 9, the hydraulic cylinder 30A is arranged in the first cylinder arranging portion 112 along the fixed shaft 12 erected on the base 11 in the height direction H, and the hydraulic cylinder 30A is arranged in the hydraulic cylinder 30A. On the other hand, the hydraulic cylinder 30B is arranged along the width direction W. At this time, the supply port 33A constituting the hydraulic cylinder 30A is arranged so as to face the +W side from the opening portion of the first cylinder arrangement portion 112.

Next, the elevating member 40 is attached to the shaft portion 10.
Specifically, in the height direction H, the fixed shaft guided portion 411 faces the fixed shaft 12 so that the fixed shaft guided portion 411 can be inserted, and the moving shaft side elevating part 46 extends along the width direction W with respect to the fixed shaft side elevating part 41. Thus, the elevating member 40 is arranged, and the elevating member 40 is lowered from above so that the fixed shaft guided portion 411 penetrates the fixed shaft 12. The bearing 50 assembled to the fixed shaft-side elevating part 41 faces the fixed shaft side chamfer 121.

Similarly, the moving shaft 13 is arranged so that the bearing 50 assembled to the moving shaft side elevating portion 46 faces the moving shaft side chamfer 131, and the moving shaft 13 is inserted from above along the moving shaft guide portion 461. To do.

At this time, the hydraulic cylinder 30A is arranged along the support shaft fixing hole 43, and the piston side connecting portion 321A constituting the hydraulic cylinder 30A is provided on the lower surface of the first cylinder fixing plate 481 as the first rod fixing portion. (Not shown). The hydraulic cylinder 30B is arranged along the second cylinder fixing portion 47, and the upper portion of the cylinder 31B is surrounded by the second cylinder fixing portion 47.

In this state, the hydraulic cylinder 30B is bolted to the second cylinder fixing portion 47, and the piston fixing hole 144 of the seat supporting portion 14 and the piston side connecting portion 321B arranged above are fixed. Further, the piston side connecting portion 321A provided on the upper end surface of the hydraulic cylinder 30A is fixed to the first rod fixing portion (not shown) provided on the lower surface of the first cylinder fixing plate 481 to move up and down with the hydraulic drive unit 20. The member 40 is fixed.

Further, since the bearing 50 assembled to the bearing assembly portion 42 slightly protrudes toward the fixed shaft guided portion 411 side or the moving shaft guiding portion 461 side, the fixed shaft guided portion 411 and the moving shaft guiding portion 461 are not supported. The fixed shaft side chamfered portion 121 and the moving shaft side chamfered portion 131 that are inserted come into contact with each other (see FIGS. 10A and 10B).

However, for example, when the fixed shaft 12 is inserted into the fixed shaft guided portion 411 in a state where the elevating member 40 is slightly inclined with respect to the height direction H, the fixed shaft guided portion 411 and the moving shaft guiding portion 461 are A part of the bearing 50 arranged in the circumferential direction may not come into contact with the fixed shaft side chamfer 121 (see FIG. 10C).

In such a case, by rotating the support mechanism-equipped support shaft 62 that supports the bearing 50 assembled to the first odd-numbered outer peripheral surface 412b and the second odd-numbered outer peripheral surface 462b, as shown in FIG. The rotary shaft c1 of the fitting part 622 can be moved to the fixed shaft chamfer 121 side.

Accordingly, the bearing 50 can be brought into contact with the fixed shaft chamfer 121, and the rotating shaft of the bearing 50 can be moved to the fixed shaft guided portion 411 side. As a result, the fixed shaft side chamfer 121 and the bearing 50 can be brought into contact with each other.

Further, if the bearing 50 presses the fixed shaft chamfer 121, the support mechanism-equipped support shaft 62 is rotated by a driver or a hexagon wrench to rotate the rotation shaft c1 of the bearing fitting portion 622 to the fixed shaft. The contact between the bearing 50 and the fixed shaft side chamfer 121 can be loosened by moving the side face chamfer 121 in the opposite direction.

As shown in FIG. 11, the synchronizing device 70 and the position detector 80 are assembled from the +L side to the shaft portion 10 and the hydraulic drive portion 20 which are fixed to the elevating member 40 in this way, and the synchronizing base portion 71 and The lifting member 40 is fixed. At the same time, the reference part 72 is fixed to the base 11, and the elevating part 73 is fixed to the seat supporting part 14, so that the shaft part 10 and the hydraulic drive part 20 are synchronized with the elevating member 40 fixed to the elevating member 40. 70 and the position detector 80 can be assembled.

In the elevating device 1 thus configured, the practitioner can step on the foot controller 930 to elevate and lower the seat support portion 14 that supports the patient in the height direction H. Hereinafter, the lifting operation of the lifting device 1 will be briefly described with reference to FIG.

When the seat support portion 14 is arranged at the lowest position (see FIG. 12(a1)), that is, when the hydraulic cylinders 30A and 30B are contracted (see FIG. 12(a2)), the practitioner When the foot controller 930 is stepped on, the lifting oil is supplied to the hydraulic cylinders 30A and 30B via the pump tube 22, the hydraulic pressure in the tank rises, and the piston rods 32A and 32B move along the height direction H. It goes up and down (FIG. 12(b2)). Since the hydraulic cylinders 30A and 30B having the same shape are connected to the single hydraulic pump 23 via the connecting pipe 21, the same pressure acts on the inside, and the same thrust is exerted. To do. Therefore, both the piston rod 32A and the piston rod 32B extend upward by the same stroke.

As a result, the first cylinder connecting portion 48 fixed to the upper end of the piston rod 32A is lifted upward, and the elevating member 40 rises along the fixed shaft 12. Further, since the seat support portion 14 fixed to the piston rod 32B constituting the hydraulic cylinder 30B fixed to the elevating member 40 is also lifted upward, the moving shaft 13 is lifted along the moving shaft guide portion 461. (See FIG. 12(b1) and FIG. 12(b2)).

Then, when the practitioner further depresses the foot controller 930, the piston rod 32A and the piston rod 32B are extended by the maximum stroke (see FIG. 12(c2)). As a result, the upper end surface of the fixed shaft-side elevating part 41 rises to a position substantially flush with the upper end part of the fixed shaft 12, and the lower end surface of the moving shaft 13 and the lower end surface of the moving shaft-side elevating part 46. The moving shaft 13 rises along the moving shaft guide portion 461 to a position where is substantially flush. That is, the seat support portion 14 is arranged at the highest position.

The elevating device 1 having such a configuration extends in the height direction H, that is, stands upright along the height direction H, and supports the patient on the fixed shaft 12 fixed to the base 11 and the upper part. The seat support portion 14 that is connected to the fixed shaft 12 is provided with an elevating member 40 that can move up and down in the height direction H with respect to the fixed shaft 12, and a hydraulic cylinder 30 that elevates the elevating member 40 with respect to the fixed shaft 12. Reference numeral 12 denotes a columnar body having a fixed shaft chamfered portion 121 that is chamfered in a planar shape on the outer peripheral surface of the cylindrical body 12x, and is fitted to the outer peripheral surface of the fixed shaft 12 by the elevating member 40. A fixed shaft guided portion 411 that is guided in the height direction H along the fixed shaft 12 is provided, and the fixed shaft side surface chamfered portion 121 is circumferentially arranged on the inner peripheral surface of the fixed shaft guided portion 411. Since the bearing 50 that rolls in the vertical direction is provided, the seat support portion 14 can be stably moved up and down.

More specifically, the elevating member 40 can be vertically moved by fitting the fixed shaft guided portion 411 to the outer peripheral surface of the fixed shaft 12 fixed to the base 11, so that, for example, the hydraulic cylinder 30 is Even in the extended state, the fixed shaft 12 is not tilted by the external force acting on the seat support portion 14, and the elevating member 40 can be stably moved up and down.

Further, the elevating member 40 includes a fixed shaft guided portion 411 fitted to the outer peripheral surface of the fixed shaft 12 having the fixed shaft chamfered portion 121, and a circumferential direction of the inner peripheral surface of the fixed shaft guided portion 411. In addition, since the bearing 50 that rolls with respect to the fixed shaft chamfer 121 is provided, when an external force acts on the elevating member 40 and the elevating member 40 tries to rotate with the fixed shaft 12 as the rotation axis, Even if there is, the bearing 50 interferes with the fixed shaft side chamfer 121 formed in a flat shape along the vertical direction, so that the relative rotation of the elevating member 40 can be prevented.

Furthermore, although the bearing 50 interferes with the fixed shaft chamfer 121, the relative rotation of the elevating member 40 is prevented. However, even if the bearing 50 interferes with the fixed shaft 12, the bearing 50 will not work. The elevating member 40 can be smoothly moved up and down by rolling with respect to the fixed shaft chamfer 121.
As described above, the above-described lifting device 1 can stably move the lifting member 40 up and down along the fixed shaft 12 fixed to the base 11, while reliably preventing the relative rotation of the lifting member 40. It can be raised and lowered smoothly.

Further, the fixed shaft 12 is configured by the fixed shaft chamfered portions 121 that are substantially quadrangular columnar bodies provided at four locations on the outer peripheral surface of the columnar body 12x at equal intervals in the circumferential direction, and the bearings 50 are provided at four locations. Since it is provided at a position facing each fixed shaft side chamfer 121, the force can be uniformly applied to the fixed shaft 12, and the elevating member 40 rotates with respect to the base 11. Without the need, it can be smoothly moved up and down along the fixed shaft 12.

Further, since the fixed shaft side chamfers 121 are evenly arranged with respect to the inner peripheral surface of the fixed shaft guided portion 411, the fixed shaft side chamfers 121 can evenly contact the bearing 50 in the circumferential direction. That is, since it is possible to prevent only the bearing 50 arranged in the predetermined direction from coming into contact with the fixed shaft side chamfer 121, the elevating member 40 does not tilt in the specific direction with respect to the fixed shaft 12, and the fixed shaft 12 is fixed to the fixed shaft 12. You can move up and down more smoothly.

Furthermore, a part of the bearing 50 is supported by the bearing fitting portion 622 that moves the rotary shaft in a direction in which the fixed shaft chamfer 121 is moved toward and away from the fixed shaft chamfer 121. The bearing 50 can be reliably brought into contact with the bearing.

More specifically, when the elevating member 40 is arranged along the fixed shaft 12, the elevating member 40 is slightly tilted, and the fixed shaft guided portion 411 provided on the elevating member 40 is slightly closer to the fixed shaft 12. Or, they may be separated. In this case, the bearing 50 may run idle without coming into contact with the fixed shaft side chamfer 121 on the rotary shaft side, and the elevating member 40 may not move up and down accurately.

On the other hand, by providing the bearing 50 with the bearing fitting portion 622 that moves the rotating shaft c1 in the direction in which the bearing 50 approaches and separates from the fixed shaft chamfer 121, the bearing 50 separates from the fixed shaft guided portion 411. Alternatively, the fixed shaft side chamfer 121 and the bearing 50 can be brought into contact with each other. As a result, the elevating member 40 can be reliably moved up and down along the fixed shaft 12 (see FIGS. 10C and 10D).

Further, the elevating member 40 is connected to the seat support portion 14 and connects the movable shaft 13 arranged in parallel with the fixed shaft 12 and the fixed shaft 12 and the movable shaft 13 together with the fixed shaft 12 and the movable shaft 12. The hydraulic cylinder 30 is configured to be movable in the axial direction with respect to 13, and includes a hydraulic cylinder 30A for moving the lifting member 40 up and down with respect to the fixed shaft 12, and a hydraulic cylinder for moving the moving shaft 13 up and down with respect to the lifting member 40. 30B, the elevating member 40 has a fixed shaft guided portion 411, and a moving shaft guide portion 461 that fits the outer peripheral surface of the moving shaft 13 to guide the moving shaft 13 in the ascending/descending direction. As a result, the lifting device 1 can be downsized.

More specifically, since the hydraulic cylinder 30A and the hydraulic cylinder 30B are the same hydraulic cylinder, the stroke of each hydraulic cylinder 30A, 30B can be halved compared to the case where there is one hydraulic cylinder. That is, the height of the lifting device 1 when the hydraulic cylinders 30A and 30B are contracted can be halved compared to the case where there is only one hydraulic cylinder, and the size of the lifting device 1 in the height direction H is reduced. it can.

Further, as described above, since the strokes of the hydraulic cylinders 30A and 30B can be halved as compared with the case where there is one hydraulic cylinder 30, the torque acting on the hydraulic cylinders 30A and 30B can be reduced, The member strength of each hydraulic cylinder 30 can be reduced. That is, it is possible to increase the choices of members used for the hydraulic cylinder 30A and the hydraulic cylinder 30B, and it is possible to achieve weight reduction and cost reduction.

Further, the moving shaft 13 is configured by a columnar body having a moving shaft side chamfered portion 131 that is chamfered in a planar shape extending in the axial direction at a plurality of positions in the circumferential direction on the outer peripheral surface of the cylindrical body. By providing the bearing 50 that rolls with respect to the moving shaft side chamfer 131 in the circumferential direction on the inner peripheral surface, when the moving shaft 13 tries to rotate with respect to the elevating member 40, the moving shaft side chamfer 131 is formed. Can contact the bearing 50 and prevent the rotation of the moving shaft 13.

As a result, relative rotation of the elevating member 40 with the moving shaft 13 as the center of rotation can be prevented, and the seat support portion 14 connected to the moving shaft 13 can be fixed at a position on an orthogonal plane orthogonal to the height direction H so that the height is fixed. It can be raised and lowered in the direction H. That is, each time the patient is moved up and down, the part to be treated does not move back and forth and left and right (longitudinal direction L and width direction W), and it is not necessary to perform delicate position adjustment for each procedure. Therefore, the practitioner can smoothly perform the treatment without stress.

Further, a part of the bearing 50 that abuts on the moving shaft chamfer 131 is provided with a bearing fitting portion 622 that moves the rotating shaft in a direction of approaching and separating from the moving shaft chamfer 131, whereby the moving shaft 13 is moved. Since the bearing 50 can be moved away from or closer to the moving shaft guide portion 461 with respect to the moving shaft guide portion 461, the moving shaft side chamfered portion 131 and the bearing 50 are surely brought into contact with each other to move the moving shaft 13 to the moving shaft guide portion 461. It can be raised and lowered along the line.

Furthermore, with respect to the arrangement direction of the movable shaft 13 with respect to the fixed shaft 12, the fixed shaft side chamfered portion 121 and the movable shaft side chamfered portion 131 are arranged so as to intersect with each other by 45 degrees, and in the height direction H. By arranging the bearings at different positions, the bearing 50 that abuts the fixed shaft chamfer 121 and the bearing 50 that abuts the movable shaft chamfer 131 do not interfere with each other, but can be placed close to each other. It is possible to further reduce the installation area of the lifting device 1 and secure a space around the lifting device 1.

Further, the hydraulic cylinders 30A and 30B are configured by hydraulic cylinders of the same thrust that exert the same thrust for the same pressure, and one hydraulic pump 23 for the hydraulic cylinders 30A and 30B. By providing hydraulic pressure to both the hydraulic cylinder 30A and the hydraulic cylinder 30B configured by the hydraulic cylinder, the hydraulic cylinder 30A and the hydraulic cylinder 30B can be easily controlled, and both the hydraulic cylinder 30A and the hydraulic cylinder 30B can be easily controlled. Can be driven simultaneously, so that the load can be prevented from being significantly biased to one side.

Further, since the hydraulic pipe connected to the hydraulic pump 23 is branched and connected to the hydraulic cylinders 30A and 30B, the height of the seat support portion 14 is kept constant regardless of the position of the elevating member 40. be able to.

More specifically, for example, when the hydraulic cylinders 30A and 30B are connected to different hydraulic pumps 23, the lifting member 40 is unintentionally lowered, that is, the pressure of the hydraulic cylinders 30A or 30B decreases. Then, the seat support portion 14 is lowered by the distance that the lifting member 40 is lowered.

On the other hand, in the lifting device 1, since the hydraulic pipe of one hydraulic pump 23 is branched and connected to the hydraulic cylinders 30A and 30B, the pressure of the hydraulic pump 23 is set to the hydraulic cylinders 30A and 30B. It is distributed with. Therefore, when the pressure of the hydraulic cylinder 30A is reduced, the pressure of the hydraulic cylinder 30B is increased by the reduced amount, and the seat support portion connected to the hydraulic cylinder 30B is lowered by the reduced pressure of the hydraulic cylinder 30A. 14 is raised, and the height of the seat support portion 14 can be maintained.
In this way, even if the height of the elevating member 40 is changed unintentionally, the height of the seat support portion 14 does not change, and the height of the patient can be reliably ensured.

In addition, the external force acting on the hydraulic cylinders 30A and 30B may be different by providing the synchronizing device 70 that synchronizes the vertical movement of the lifting member 40 with respect to the fixed shaft 12 and the vertical movement of the moving shaft 13 with respect to the lifting member 40. However, the hydraulic cylinder 30A and the hydraulic cylinder 30B can be simultaneously driven with substantially the same stroke.

The synchronizer 70 will be described below with reference to FIG.
For example, in the case where the hydraulic cylinder 30A and the hydraulic cylinder 30B configured by the same hydraulic cylinder 30 are controlled by the hydraulic pump 23, if the pressure acting on the hydraulic cylinder 30A and the pressure acting on the hydraulic cylinder 30B are different, the hydraulic cylinder The strokes of 30A and the hydraulic cylinder 30B are different.

Specifically, in the state where the seat support portion 14 is at the lowest position (see FIG. 13A), only the hydraulic cylinder 30A is unintentionally applied with pressure, and only the elevating member 40 moves along the fixed shaft 12. When rising, the reference portion 72 is fixed to the fixed shaft 12 and the synchronizing base portion 71 is fixed to the elevating member 40. Therefore, the synchronizing base portion 71 is raised and lowered while the reference portion 72 is fixed to the base 11. It will rise together with the member 40 (see FIG. 13B).

That is, the first gear 74 and the second gear 75 fixed to the elevating member 40 rise, and the first chain 76 having one end fixed to the reference portion 72 is pulled in the −H direction, 74 rotates counterclockwise. As a result, the elevating part 73 fixed to the other end of the first chain 76 is pulled in the +H direction and ascends (see FIG. 13B). Since the second chain 77 is pulled upward based on the rise of the elevating part 73, the second gear 75 also rotates counterclockwise.

Here, since the elevating part 73 is fixed to the seat support part 14 (moving shaft 13), the seat supporting part 14 ascends as the elevating part 73 rises, and the piston rod 32B connected to the moving shaft 13. Is pulled upward to drive (see FIG. 13C).

In this case, since the lengths of the first chain 76 and the second chain 77 are constant, the ascending distance of the first gear 74 and the second gear 75 (the ascending distance of the elevating member 40) and the ascending distance of the elevating part 73 ( The ascending distance of the moving shaft 13) becomes equal. Therefore, the stroke amounts of the hydraulic cylinder 30A and the hydraulic cylinder 30B are the same.
With the above-described configuration, the elevating member 40 can be positioned at a substantially central portion between the base 11 and the seat support portion 14.

As described above, by providing the synchronizing device 70, one hydraulic cylinder 30 can be pulled up so that the hydraulic cylinder 30A and the hydraulic cylinder 30B have the same stroke amount. As a result, the hydraulic cylinders 30A or 30B can be driven equally, and the durability of only one of the hydraulic cylinders 30A or 30B can be prevented from deteriorating.

Further, the synchronization device 70 includes a first gear 74 and a second gear 75 rotatably provided on the elevating member 40, one end side fixed to the fixed shaft 12 and the other end side fixed to the moving shaft 13, and By configuring the first chain 76 and the second chain 77 that mesh with each other, it is possible to reliably synchronize the raising and lowering of the elevating member 40 with respect to the fixed shaft 12 and the raising and lowering of the moving shaft 13 with respect to the elevating member 40 with a simple configuration. it can. Further, as compared with the case where the raising and lowering of the raising and lowering member 40 with respect to the fixed shaft 12 and the raising and lowering of the moving shaft 13 with respect to the raising and lowering member 40 are synchronized by using a complicated structure such as an electronic mechanism, the simple and stable raising and lowering is performed. Can be realized.

Furthermore, by providing the position detector 80 that detects the lifting/lowering of the lifting/lowering member 40 with respect to the fixed shaft 12, the position of the lifting/lowering member 40 with respect to the fixed shaft 12 can be accurately grasped. For example, the lifting/lowering member 40 has a predetermined position. When the position is higher or lower than this, it is possible to prevent the elevating member 40 and the seat support member 14 from interfering with other members such as the board by notifying by a separately provided notifying unit or the like.

Further, by feeding back the position of the elevating member 40 detected by the position detector 80 as information, for example, the elevating member 40 is driven even if the practitioner drives the hydraulic cylinder 30 so as to be arranged at a desired position. It is possible to know that the position has not reached the desired position, and it is possible to know whether the elevating member 40 is normally moved up and down.

The position detector 80 is fixed to the elevating member 40 and extends along the height direction H. The rack 82 is rotatably fixed to the fixed shaft 12, and the pinion 83 meshes with the rack 82. The rotation speed of the pinion engaged with the rack 82 fixed to the lifting member 40 can be reliably detected by the potentiometer 84 for detecting the rotation speed of the lifting member 40. And it can be detected reliably.

Further, the above-described lifting device 1 is provided, the seat support portion 14 is constituted by the seat support portion 14 to which the seat on which the patient sits is fixed, and the hydraulic cylinders 30A and 30B are the width of the seat support portion 14. By arranging along the direction W, the above-mentioned lifting device 1 can be reduced in size with respect to the longitudinal direction L of the seat support portion 14, and a space in the depth direction below the seat support portion 14 can be secured. Thereby, for example, the practitioner can place his/her feet in the space, and can approach the patient who is the treatment target near the patient without undue posture. Therefore, the patient can be placed in a position that facilitates the operation at a position close to the patient, and the operation can be performed reliably and smoothly.

The arrangement of the lifting device 1 in the medical examination device 900 will be described in more detail with reference to FIG.
The elevating device 1 is provided below the elevating base 920 of the medical examination table 910. The hydraulic cylinders 30A and the hydraulic cylinders 30B, the fixed shaft 12 and the movable shaft 13 which form the lifting device 1 are arranged along the width direction W, and the hydraulic cylinders 30A and the hydraulic cylinder 30B, the fixed shaft 12 and the movable shaft 13 are arranged. And are arranged along the longitudinal direction L. The fixed shaft 12 and the movable shaft 13 are arranged on the +L side of the hydraulic cylinder 30.

Further, the hydraulic pump 23 is arranged near the feet along the longitudinal direction L with respect to the hydraulic cylinders 30A and 30B. By arranging the hydraulic cylinders 30A and 30B in this manner, the lifting device can be made compact, so that the surgeon's undercarriage can be easily moved.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The moving unit corresponds to the moving shaft 13, the seat support portion 14, and the lifting member 40,
The drive unit corresponds to the hydraulic drive unit 20,
The chamfer corresponds to the fixed shaft side chamfer 121,
The patient support corresponds to the seat support 14,
The guided portion corresponds to the fixed shaft guided portion 411,
The rotation axis adjustment mechanism corresponds to the support mechanism-equipped support shaft 62,
The connecting lifting member corresponds to the lifting member 40,
The first drive unit corresponds to the hydraulic cylinder 30A,
The second drive unit corresponds to the hydraulic cylinder 30B,
The guide portion corresponds to the moving shaft guide portion 461,
The rolling element, the fixed shaft side rolling element, and the moving shaft side rolling element correspond to the bearing 50,
The hydraulic pump corresponds to the hydraulic pump 23,
The synchronization mechanism corresponds to the synchronization device 70,
The gears correspond to the first gear 74 and the second gear 75,
The cord body corresponds to the first chain 76 and the second chain 77,
The lift position detection mechanism corresponds to the position detector 80,
The seat support portion corresponds to the seat 911,
The present invention is not limited to the configurations of the above-described embodiments, and many embodiments can be obtained.

For example, in the present embodiment, eight bearing assembling portions 42 are provided, but the number of bearing assembling portions 42 need not necessarily be this number, and one bearing assembling portion 42 may be provided at a predetermined location, or four bearing assembling portions 42 may be evenly provided in the circumferential direction. May be.

Further, in the present embodiment, the hydraulic cylinders 30A and 30B are used to move the elevating member 40 up and down. However, for example, a cylinder or a motor and a screw shaft that are moved up and down using water pressure or air pressure are used. You may raise and lower electrically by the combination raising and lowering mechanism.

Further, instead of the hydraulic cylinder 30, an elevating mechanism using an electric motor and a screw shaft may be replaced. Further, a gear is provided in the fixed shaft side chamfer 121, and the elevating member 40 is moved up and down by rotation of a gear instead of a bearing, or a gear (pinion) meshed with the rack is provided with a rack along the fixed shaft 12 as a motor. A gear structure or the like that is rotated by, for example, may be used.

Further, in the present embodiment, the medical examination apparatus 900 is a dental examination table, but the medical examination apparatus 900 is not limited to dental treatment, and for example, an otolaryngology examination table, an ophthalmic examination table, and an obstetrics/gynecology examination. It may be used for a medical examination table such as a table.

Furthermore, the seat support portion 14 does not have to be limited to the configuration in which the backrest 912 is connected to the seat seat 911 that tilts with respect to the seat seat 911, and may be appropriately changed according to the medical examination table. Specifically, the backrest 912 may be connected to the seat support portion 14 of a flat and wide seat seat without being tilted with respect to the seat seat 911 and moved up and down.

In addition, in the present embodiment, the moving unit corresponds to a component configured by the moving shaft 13 that connects the seat support portion 14 to the upper end surface and the elevating member 40, but it does not necessarily have to have this configuration. For example, the moving shaft 13 may not be provided, and the seat support portion 14 may be fixed to the elevating member 40. That is, as another embodiment of the present invention, a one-step lifting device that does not include the moving shaft 13 and the hydraulic cylinder 30B that moves the moving shaft 13 up and down may be used.

DESCRIPTION OF SYMBOLS 1 Lifting device 11 Base 12 Fixed shaft 12x Cylindrical body 121 Fixed shaft side chamfer 13 Moving shaft 131 Moving shaft side chamfer 14 Patient support 20 Hydraulic drive unit 23 Hydraulic pump 30 Hydraulic cylinder 40 Lifting member 411 Fixed shaft cover Guide unit 461 Moving shaft Guide unit 50 Bearing 62 Support shaft with moving mechanism 70 Synchronizer 74 First gear 75 Second gear 76 First chain 77 Second chain 80 Position detector 82 Rack 83 Pinion 84 Potentiometer 910 Medical examination table 911 Seat seat

Claims (11)

Along with extending vertically, a fixed shaft fixed to the base,
Upper end patient support for supporting a patient is connected to a mobile unit vertically movable in the vertical direction with respect to the fixed shaft,
And a drive unit for moving the moving unit up and down with respect to the fixed shaft,
The fixed shaft is
On the outer peripheral surface of the cylindrical body, a fixed shaft chamfered portion that is chamfered in a planar shape extending in the axial direction is formed of a substantially rectangular columnar body provided at four locations at equal intervals in the circumferential direction on the outer peripheral surface of the cylindrical body,
The mobile unit is
A moving shaft connected to the patient support portion and arranged in parallel with the fixed shaft,
While connecting the fixed shaft and the moving shaft, it is configured by a connecting lifting member that is axially movable with respect to the fixed shaft and the moving shaft,
The movement axis is
The chamfered moving shaft chamfered in a planar shape extending in the axial direction is formed of a substantially rectangular columnar body provided at four locations on the outer peripheral surface of the cylindrical body at equal intervals in the circumferential direction,
The connection elevating member has a guided portion that fits on the outer peripheral surface of the fixed shaft and is guided in the vertical direction along the fixed shaft, and moves up and down on the fixed shaft side relative to the fixed shaft. Department,
It is arranged in parallel with the fixed shaft side elevating part and is integrally connected with the moving shaft side elevating part,
Wherein the circumferential direction of the inner circumferential surface of the guide portion, the fixed shaft side rolling elements that roll is provided et been with respect to the fixed shaft side chamfer portion,
The moving shaft side elevating part is provided with a guide part that fits the outer peripheral surface of the moving shaft and guides the elevating direction of the moving shaft.
In the circumferential direction on the inner peripheral surface of the guide portion, a moving shaft side rolling element that rolls with respect to the moving shaft chamfered portion is provided,
With respect to the arrangement direction of the movable shaft with respect to the fixed shaft, the fixed shaft side chamfered portion and the movable shaft side chamfered portion are arranged in a direction intersecting with each other by 45 degrees,
The lifting device on the fixed shaft side and the lifting device on the moving shaft side are arranged at different positions in the vertical direction . The fixed shaft-side rolling element that rolls around a rotary shaft as a center of rotation,
Rotary axis adjusting mechanism for moving the rotary shaft in a direction close to and away from relative to said stationary shaft side chamfer provided
The lifting device according to claim 1 . The drive unit is
A first drive unit that raises and lowers the connecting lifting member with respect to the fixed shaft;
And a second driving unit that moves the moving shaft up and down with respect to the connecting lifting member .
The lifting device according to claim 1 or 2 . The first drive unit and the second drive unit are hydraulic cylinders of the same thrust that exert the same thrust for the same pressure, and with respect to the first drive unit and the second drive unit. Equipped with one hydraulic pump,
Applying hydraulic pressure to both the first drive unit and the second drive unit that are configured by the hydraulic cylinder
The lifting device according to claim 3 . The moving shaft side rolling element,
A rotating shaft adjusting mechanism for moving the rotating shaft in a direction in which the rotating shaft is moved toward and away from the chamfered portion of the moving shaft is provided.
The lifting device according to any one of claims 1 to 4 . Elevating the connecting elevating member with respect to the fixed shaft,
A synchronizing mechanism is provided to synchronize the raising and lowering of the moving shaft with respect to the connecting raising and lowering member.
The lifting device according to any one of claims 1 to 5 . The synchronization mechanism is
A gear rotatably provided on the connecting elevating member,
One end side is fixed to the fixed shaft side and the other end side is fixed to the moving shaft side, and is composed of a cord body that meshes with the gear.
The lifting device according to claim 6 . An elevating position detecting mechanism for detecting elevating the connecting elevating member with respect to the fixed shaft was provided.
The lifting device according to any one of claims 1 to 7 . The lifting position detection mechanism,
A rack fixed to the connecting elevating member and extending vertically.
A pinion rotatably fixed to the fixed shaft and meshed with the rack,
And a potentiometer for detecting the rotational speed of the pinion
The lifting device according to claim 8 . An elevating device according to any one of claims 1 to 9 is provided,
The patient support is
A medical examination table comprising a seat support portion to which a seat for seating the patient is fixed. The lifting device according to claim 3 is provided,
The patient support is
The seat on which the patient is seated is composed of a seat support portion to which is fixed,
The medical examination table in which the first drive unit and the second drive unit are arranged along the width direction of the seat support unit.

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