JPS6358580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an upright bed device for, for example, an X-ray diagnostic apparatus.

2. Description of the Related Art An example of an up/down bed device used in a conventional X-ray diagnostic apparatus is shown in FIGS. 1 and 2. This is done by intentionally providing a pair of guide rails 2, 2' with a desired spacing along the longitudinal direction of the side wall 1a of the bed 1, and also providing a rack 5 along the guide rail 2.
Guide guides 4 and 4' provided on the sides of the semicircular gear 3 are fitted inside, respectively. Among these guide guides 4, 4', the upper guide guide 4 is arranged at two locations at a desired interval in the lateral direction, and the lower guide guide 4'
It is located approximately in the middle of the The semicircular gear 3 is connected to the bed support base 7 via a shaft (not shown).
is supported by A small gear 6 is attached to the shaft and meshes with a rack 5 attached to the side wall 1a of the bed 1. A small gear 8 that meshes with the semicircular gear 3 is arranged on the bed support base 7 via a shaft (not shown), and these small gears 6, 8 are driven by a drive member (not shown). It is configured to rotate.

To explain the sequence of operations from the horizontal state shown in FIG. 1 to the upright state shown in FIG. 2 using the upright bed device in an X-ray diagnostic apparatus or the like configured as described above, the driving member (not shown) is actuated. The pinion gears 6 and 8 are rotated in the direction of arrow A and the direction of arrow B, respectively, and the pinion gear 6 moves the rack 5 meshed therewith in the direction of arrow B', thereby moving the bed 1 on which the rack 5 is attached. At the same time as the small gear 8 is moved along the guide rails 2 and 2', the semicircular gear 3 meshed therewith is rotated in the direction of the arrow A', and a guide attached to the side of the gear 3 is rotated. Guide 4, 4'
The bed 1 is then rotated counterclockwise via a pair of guide rails 2 and 2' provided on the side wall 1a of the bed 1. In this way, the bed 1 is raised and lowered. Further, in order to raise and lower the bed 1 to the opposite side, the small gear 6 and the small gear 8 must be rotated in opposite directions.

In this raising/lowering operation, if the sliding amount of bed 1 with respect to gear 3 is S, and the raising/lowering angle at this time is θ, then S=θ/90×Smax...(1) (Smax...sliding amount is large), and at this time If the amount of rise of the bed 1 is H, then H=Ssinθ...(2) Substituting equation (1) into equation (2) yields H=θ/90×Smax・Sinθ.

When equations (1) and (2) are expressed in graphs as shown in Figures 10 and 11, the sliding amount S of the bed increases in proportion to the tilting angle θ. ing. On the other hand, it can be seen that when the value of the tilting angle θ is small, the amount of rise of the bed is extremely small, and when it exceeds a predetermined value, the amount of rise of the bed becomes large.

However, due to recent diagnostic reasons, in order to improve the image quality of X-ray photographs by minimizing the distance from the floor of the bed 1 in the horizontal position, the bed 1
It is required to increase the distance between the top plate (not shown) and the top plate surface and the X-ray tube in the case of an undertube. At the same time, it is required that the axis of the X-ray tube and imaging unit be slid in the longitudinal direction of the bed, and that the dimensions of the axis of the X-ray tube and imaging unit and the floor surface be large when standing. In order to do this, the X-ray tube, etc. must be raised above the floor at the same time as the bed is raised.
Gear 3 is used in the raising/lowering bed device used in radiographic diagnostic equipment, etc.
The sliding amount of the bed 1 relative to the gear 3 changes at a constant speed with respect to the tilting angle. 1 may come off, and it is also possible to eliminate mechanical movement and use separate drive units to control the tilt angle and slide electrically, but malfunctions of the electrical control may occur. There were many drawbacks, such as collisions occurring due to

This invention eliminates the drawbacks of the above-mentioned conventional devices and allows the bed to rise near the horizontal position by varying the amount of slide of the bed in a variable speed manner with respect to the tilting angle of the bed without changing the maximum slide amount of the bed. It is an object of the present invention to provide a raising/lowering bed device that can increase the amount of bed.

This invention will be described with reference to embodiments shown in the drawings.

FIG. 3 is a front view in a horizontal state showing an embodiment of the raising/lowering bed device of the present invention, FIG. 4 is a sectional view of the driving portion, and FIG. 5 is a front view showing the same in the raising/lowering state. In each figure, reference numeral 10 denotes an elevating bed device, and this elevating bed device 10 is equipped with a bed 11 on which a patient is placed. On the side wall 11a of the bed 11, a pair of guide rails 12, 12' are arranged in parallel at a desired interval along the longitudinal direction (direction parallel to the mounting surface). A pair of guides 14, 14' provided on the sides of a semicircular gear 13 are slidably fitted into the guide rails 12, 12', respectively. Of these guides 14, 14', the upper guide 14 is arranged at two locations at a desired interval in the lateral direction, and the lower guide 14'
is arranged approximately in the middle of the pair of upper guides 14. The semicircular gear 13 is pivotally supported via a bearing 15a on a shaft 15 provided in the middle of the guides 14, 14', and a small gear 18 meshes with the gear 13 below. The shaft 22 of the small gear 18 is connected to a reducer 26 connected to an electric motor 25 via gears 23 and 24, and the electric motor 25 rotates the small gear 18, which in turn rotates the gear 13 meshing with the small gear 18. The bed 11 is raised and lowered. A sprocket 27 is attached to the bed support base 17 side of the shaft 15. This sprocket 27 is connected via an endless chain 28 to a sprocket 31 mounted on a shaft 30 having a gear 29 at one end. A gear 29 of the shaft 30 meshes with the gear 23 and is rotated by the electric motor 25 when the gear 23 rotates. The end of the shaft 15 opposite to the bed support base 17 protrudes through an elongated hole 11b of a desired length provided along the guide rail 12 provided in the side wall 11a, and the protruding portion of the shaft 15 has a One end of the first link 19 is fixed,
One end of the second link 20 is pivotally supported on the other end of the first link 19 via a pin 32 . The other end of the second link 20 is connected to the bed 1.
It is pivotally supported by a pin 33 provided on the side wall portion of 1.
The length l between the supporting points of the first and second links 19 and 20 is formed to be approximately the same length, and when the bed 11 is in a horizontal state, the first and second links 1
9 and 20 are configured to be folded over each other. Further, the first and second links 19 and 20 are connected to the pin 32.
An appropriate regulating member (not shown) is attached to prevent the shaft from becoming straight. Note that in the above embodiment, the small gear 18 that drives the semicircular gear 13 and the shaft 15 that rotates the first link 19 are driven by the same driving member; The invention is not limited to this, and each may be driven separately.

In the device of the present invention configured in this way,
When the maximum sliding amount is Smax, the length l of the first link 19 and the second link 20 is l=Smax/2, and the gear 13 is moved 90 degrees in the direction of arrow C by the small gear 18 rotated by the electric motor 25. When rotated by 90 degrees, the first link 19 rotates an additional 90 degrees relative to the gear 13 in the same direction (direction of arrow D), and the bed 11 slides up and down relative to the gear 13. Become. The relationship between the sliding amount S and the tilting angle θ at this time is S=2×lsinθ=Smax×sinθ…(3), and the rising amount H of the bed is H=Ssinθ=Smax×sin ² θ…( 4) becomes. When formulas (3) and (4) are displayed on a graph, the first
As shown in Figures 0 and 11, the slide amount S of the bed increases rapidly at the initial stage of the tilting angle θ, and then gradually increases as the tilting angle θ increases. On the other hand, as the raising/lowering angle θ increases, the rise amount H of the bed increases almost in proportion to this, and it can be seen that in both cases, the value is larger than that of the conventional bed.

Although the above embodiment shows the first link 19 rotating at a constant raising/lowering speed, it is possible to keep the rotation stroke constant and increase the rotation speed near the horizontal position of the bed. By varying the speed, the initial value of the rise amount S can be further increased.

FIG. 6 is a schematic sectional view showing another embodiment of the driving portion of the present invention, and FIG. 7 is a front view of the main portion. This is constructed integrally with a sprocket 38 fixed to one end of the second link 20, and an endless chain 39 is stretched between the sprocket 38 and a sprocket 34 fixed to the shaft 15.
As the shaft 15 rotates, the endless chain 39 of the sprocket 34 rotates.
The second link 20 is auxiliarily rotated by the second link 20 to control the direction of the bed 11 from the horizontal position to the upright position, and is configured to rotate in an accurate direction. ing. Since the other parts are the same as those of the previous embodiment, the same parts are given the same reference numerals and detailed explanation thereof will be omitted.

FIG. 8 is a schematic sectional view of a main part showing still another embodiment, and FIG. 9 is a front view thereof. This is done by keeping the rotational stroke of the link constant, increasing the rotational speed near the horizontal position of the bed 11, and varying the speed to further increase the amount of rise. That is, one end of the first link 19A is attached to the gear 13, and the pin 3 protrudes through an arc-shaped elongated hole 11c in the side wall of the bed 11.
5, and the other end is connected to the second
The link 20 is pivotally supported at one end of the link 20. and,
A long hole 36 extending in the longitudinal direction is bored between both fulcrums of the first link 19A, and a pin 37 provided at one end of the third link 21 is fitted into this long hole 36. There is. The other end of the third link 21 is connected to a shaft 15A (which is rotated by the electric motor 25 of the above embodiment) which is rotated by a drive member disposed at a position shifted by a distance R from the fulcrum 35 of the first link 19A. (It may also be a rotating shaft 15.) This shaft 15A is arranged on an extension line connecting the supporting points of the first link 19A. When the shaft 15A is rotated by the drive member, the third link 21 attached thereto is rotated in the direction of arrow D.
The first link 19A of the elongated hole 36 into which the pin 37 at the other end of the link 21 is fitted also rotates in the same direction about the pin 35 as a fulcrum. The rotation of the first link 19A causes the second link 20, which is pivotally supported thereto via a pin 32, to rotate, thereby moving the bed 11 to the guide rails 12, 12' and the gear 13. The guides 14, 14' are used to slide the guides 14, 14'. At this time, the first link 1
As the gear 13 rotates, the pin 35 to which the pin 9A is attached moves along the elongated hole 11c of the side wall 11a. Also, the fulcrum 3 of the first link 19A
5 and the fulcrum 37 of the third link 21, R ₁ ;
Distance between shaft 15A and fulcrum 37 of third link 21
By configuring R ₂ to satisfy R ₁ <R ₂ , even if the rotation speed of the third link 21 is constant, the rotation speed of the first link 19A is faster near the horizontal position of the bed 11. It is something that can be done. Note that the other parts are substantially the same as those of each of the embodiments described above, so a detailed explanation thereof will be omitted.

Further, in each of the above embodiments, the bed 11 is raised and lowered in one direction, but the invention is not limited to this, and by rotating the gear 13 and the shaft 15 in the opposite direction, the bed 11 is Needless to say, it can be raised and lowered in the opposite direction. In addition, the rotation speed of the gear 13 and the length of the link are determined as appropriate depending on the raising/lowering bed device used, and although the description is given for the gear provided on one side of the bed, this is not limited to this. , may be arranged facing each other on both sides.

It should be noted that each of the above-mentioned embodiments is merely an example, and it goes without saying that each member can be replaced with another member having the same function.

This is especially effective in an undertube type X-ray diagnostic apparatus in which the X-ray tube is required to be placed at a distance from the top plate. Therefore, in addition to being economical because the time required for photographing can be significantly shortened, it also has excellent effects such as being extremely simple in configuration and being able to supply products with fewer failures at low cost. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional tilting bed device in a horizontal state, Fig. 2 is a front view showing the same in an upright state, and Fig. 3
The figure is a front view in a horizontal state showing an embodiment of the tilting bed device of the present invention, FIG. 4 is a schematic sectional view of the driving part, FIG. 5 is a front view showing the tilting bed device in the tilting state, and FIG. 7 is a front view showing the main part, FIG. 8 is a schematic sectional view of the main part showing still another embodiment,
FIG. 9 is a front view of the same, FIG. 10 is a comparison diagram of the bed sliding amount S at the raising/lowering angle θ, and FIG. 11 is a comparison diagram of the bed rising amount H at the raising/lowering angle θ. 10... Raising bed device, 1, 11... Bed,
2, 12... Guide rail, 3, 13... Gear,
4,14...guide, 5...easy, 6...
Small gear, 7, 17... Bed support base, 8, 18
...Small gear, 19...First link, 20...Second link, 21...Third link, 23,2
4, 29... Gear, 27, 31, 38... Sprocket, 28, 39... Endless chain, 36...
Long hole.

Claims (1)

[Claims] 1 A bed on which a patient is placed, a rotating member that rotates the bed in a direction crossing the placement surface, a guide member that guides the bed parallel to the placement surface, and a rotating member that a first link whose one end rotates in conjunction with the rotation of the bed and whose other end is rotatably fixed; and a first link which has the same length as the first link and whose one end is rotatable with the first link. A moving member comprising a second link connected to the bed, the other end of which is connected to the bed and movable along the guide member, and a drive member that drives the rotating member and the moving member. A tilting bed device.