JP3924650B2 - Structure for raising and lowering the floor in a bed - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lifting / lowering operation structure for a floor in a bed, and more specifically, a lifting / lowering drive shaft that can be freely rotated by an operation portion is provided, and the rotational force of the lifting / lowering driving shaft is converted into a moving force in the axial direction. The push-pull member is interlocked and connected via a conversion part, and the push-pull member and the floor part are interlocked and connected via a link in order to raise and lower the floor part by the push-pull operation of the push-pull member. The present invention relates to a lifting / lowering operation structure of a floor in a bed.
[0002]
[Prior art]
In raising and lowering the floor portion of the bed, the elevating drive shaft is rotated by manually rotating the handle as the operation portion. This rotational force is converted into a moving force in the axial direction via the converting portion, and the push / pull member is pushed and pulled by the converted moving force, so that the floor portion can be moved up and down. . Conventionally, since the elevating drive shaft and the push / pull member are always interlocked and connected via the converter, the following inconvenience has occurred.
[0003]
In other words, when the floor is at the highest lift position or the lowest drop position, if it is further moved upward or downward, the lift drive shaft rotates, but the push / pull member cannot move. A load is applied to the conversion part that connects the shaft and the push / pull member, and the conversion part is damaged or the interlocking is cut off. was there.
[0004]
[Problems to be solved by the invention]
In view of the above-described situation, the present invention intends to solve the problem of providing a lifting / lowering operation structure for a floor portion in a bed that can be used satisfactorily for a long period of time without damaging the conversion portion. .
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is provided with an elevating drive shaft that can be freely rotated by an operation unit, and a conversion unit that converts the rotational force of the elevating drive shaft into a moving force in the axial direction. In order to link the push-pull member and move the floor portion up and down by the push-pull operation of the push-pull member, the floor portion of the bed in which the push-pull member and the floor portion are linked and connected via a link is used. A lifting and lowering operation structure, wherein the elevating drive shaft comprises a screw shaft, and a sliding member that is externally fitted to the screw shaft and is movable in the longitudinal direction of the screw shaft by rotation of the screw shaft; Straight without a screw part, which moves integrally with the sliding member and constitutes the conversion part from a guide member connected to the push-pull member, and is provided at both longitudinal ends of the screw shaft. A shaft and at least one of these two straight shafts Kiyuka portion is composed of an elastic body that moves urging upon positioning the sliding member is moved to the straight shaft portion into the screw portion of the screw portion is formed in the lowest position, the uppermost of the floor A release means for releasing the interlock between the elevating drive shaft and the push / pull member at the position and the lowest lowered position, and a blocking means for preventing the elevating drive shaft from rotating due to a load from the floor. It is characterized by providing. When the floor is moved up and down, the sliding member moves in the longitudinal direction of the screw shaft by rotating the screw shaft, and the guide member and the push / pull member move together in the same direction together with the sliding member. Then, the floor is raised and lowered. Moreover, at the same time when the floor portion is positioned at the highest position and the lowest position, the sliding member is positioned at the straight shaft portion, and the rotational force of the screw shaft due to further upward or downward operation is transmitted to the sliding member. There is nothing to do. When the floor portion is in the lowest lowered position, when the lifting operation is performed, the sliding member is urged to move to the screw portion side by the elastic body, so the sliding member immediately engages with the end portion of the screw portion. The sliding member slides on the screw part, and the floor part is raised. Further, when the floor portion is located at the highest position, when the lowering operation is performed, the sliding member is moved and urged toward the screw portion end side by the load from the floor portion. Even if it is not provided, the sliding member immediately engages with the end of the screw portion as described above, the sliding member slides on the screw portion, and the floor portion is lowered. As described above, even if the lifting drive shaft is rotated to further raise or lower the floor portion by the operation portion at the highest rise position and the lowest drop position of the floor portion, the lift drive shaft and the push / pull member are interlocked. Therefore, the rotational force of the elevating drive shaft is not transmitted to the push / pull member. When the floor is in the raised position, it is possible to prevent the elevating drive shaft from rotating in the floor lowering direction, so that the floor does not unexpectedly descend.
[0007]
The blocking means is constituted by a piece member that can move by rotation of the elevating drive shaft in a storage portion formed inside a fixing member that is externally fitted to the elevating drive shaft, and the inner surface on the braking direction side is gradually increased. The storage portion is formed so as to draw a gentle arc located on the center side.
Therefore, when the elevating drive shaft receives a load from the floor and rotates, the piece member moves to the braking side, and the piece member bites between the elevating drive shaft and the fixed member, so that the elevating drive shaft The rotation is prevented. Then, by forming a gentle arc so that the inner surface of the storage portion is gradually positioned on the center side, the biting force is controlled so that the elevating drive shaft does not rotate under the load from the floor portion. Since the power can be set, the rotational operation force of the elevating drive shaft in the braking direction can be reduced as much as possible.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a bed. The bed includes a pair of left and right first frames 1 and 1 constituting an outer frame frame and a pair of front and rear second frames that connect the first frames 1 and 1. Frames 2 and 2 and a pair of left and right main frames 3 and 3 for supporting the frame frame so as to be movable up and down at an inner side of the frame, and a floor portion 4 placed on the main frames 3 In addition, the casters 5 are attached to the boss portions 5a fixed to the front end portions and the rear end portions of the main frames 3 and 3, respectively, thereby constituting a movable bed.
[0009]
The floor 4 is located on the back floor 6 located on the front side of the bed, the lumbar floor 7 located just behind the bed, the knee floor 8 located just behind the floor, and immediately behind the back floor 6. In addition to the leg floor 9, the back floor 6 can be changed to a horizontal lying posture and a raising posture with a set angle rising from this lying posture.
[0010]
The floor raising / lowering mechanism for changing the posture of the back floor 6 will be described. As shown in FIGS. 1 to 5, as shown in FIGS. A telescopic rod connected to one rod 12 and spline-fitted to a free end portion of the first rod 12 in a hollow second rod 14 supported by a bracket 13 fixed to the fixing portion. 15 is connected by a pin, and an arm 16 is fixed to the free end of the second rod 14 in a direction perpendicular to the longitudinal direction of the second rod 14, and a crank as an operation unit can be folded and stored in the recess 16A of the arm 16. The handle 17 is pivotally connected.
A push / pull member 19 is interlocked and connected to the elevating drive shaft 9 via a conversion unit 18 that converts the rotational force of the drive shaft 9 into a moving force in the axial direction. In order to move up and down, the push / pull member 19 and the back floor 6 are interlocked and connected via a link 20.
Accordingly, by rotating the crank handle 17, the lifting drive shaft 10 is rotated, and this rotational force is converted into the axial movement force of the push / pull member 19 by the converter 18, and the push / pull member 19 is pushed and pulled, and the posture of the back floor 6 is changed via the link 20. The present invention can be used to change the posture of the back floor 6 from the lying posture to the undulating posture set at a set angle, or change the posture of the entire floor 4 from the lying posture to the undulated posture set at a set angle, The whole part 4 can be used for the one whose position can be changed to the upper side with the lying posture.
[0011]
The elevating drive shaft 10 is composed of a screw shaft having a screw formed on the outer surface, and is fitted on the screw shaft 10 and is movable in the longitudinal direction of the screw shaft by rotation of the screw shaft. A cylindrical sliding member 21 having an internal thread 21 </ b> A formed on the inner surface thereof, a guide that is spline-fitted so as to move integrally with the sliding member 21, and is latched and connected to the push / pull member 19. The conversion unit 18 is constituted by the member 22. A straight tooth portion 21B is formed at four locations on the outer peripheral surface of the sliding member 21, and a hole 22B that fits into the tooth portion 21B is formed on the inner surface of the guide member 22 to form a square spline. Is configured. 23 shown in the figure is a cover cap for preventing the sliding member 21 from coming off, and is screwed and fixed to a female screw portion 22A formed on the inner surface of the end portion of the guide member 22 as shown in FIG. A male screw portion 23 </ b> A is formed on the outer surface of the front end of the cover cap 23.
[0012]
Straight shaft portions when straight shaft portions 10A having no screw portions are provided at both ends in the longitudinal direction of the screw shaft 10 and the back floor 6 of these two straight shaft portions 10A, 10A is positioned at the lowest lowered position. A coil spring 24 is provided as an elastic body that moves and urges the sliding member 21 moved to 10A toward the screw portion on which the screw portion 10B is formed. The two straight shaft portions 10A and 10A and the coil spring 24 are referred to as release means for releasing the interlocking between the screw shaft 10 and the push / pull member 19. By providing the straight shaft portions 10A and 10A in this way, the back floor 6 is positioned at the highest rise position and the lowest drop position, and at the same time, the sliding member 21 is located at the straight shaft portion 10A or 10A and is further raised. The rotational force of the screw shaft 10 due to the operation or the lowering operation is not transmitted to the sliding member 21. When the back floor 6 is located at the lowest position, when the raising operation is performed, the sliding member 21 that is moved and urged toward the screw portion by the coil spring 24 immediately engages with the end portion of the screw portion and slides. The member 21 slides on the screw portion 10B, and the back floor 6 is raised. The sliding member 21 that has moved to the one straight shaft portion 10A is moved and urged toward the screw portion by the coil spring 24, but the sliding member 21 that has moved to the other straight shaft portion 10A is similarly coil spring. The sliding member 21 can be further easily engaged with the end portion of the screw portion by using not only the load from the back floor 6 but also the biasing force by the coil spring. May be. 30 shown in the figure is a spring receiving member for receiving the coil spring 24.
[0013]
A blocking means 25 is provided to prevent the screw shaft 10 from rotating due to a load from the back floor 6. As shown in FIGS. 5 and 7, the blocking means 25 fixes a fixing member 26 fitted on the screw shaft 10 to a casing 27 fixed to the bed side using screws 28 at two upper and lower positions. The bar-shaped piece member 29 is housed in each of a plurality of housing portions 26A formed inside the fixing member 26. Accordingly, when the screw shaft 10 is rotated to lower the back floor 6, the piece member 29 moves to the side where the storage area decreases, and the piece member 29 is moved between the storage portion 26 </ b> A and the screw shaft 10. By biting in, the rotation of the screw shaft 10 in the counterclockwise direction in FIG. 7 is prevented, so that the back floor 6 after the raising operation is not lowered unexpectedly. Then, as shown in the figure, when the screw shaft 10 is not operated, the rotation is blocked, and when the screw shaft 10 is operated, a braking force that can be easily rotated in the braking direction is applied to the screw shaft 10. In addition, by forming the storage portion 26A so as to draw a gentle arc such that the inner surface 26B on the braking direction side is gradually located on the center side, the screw shaft 10 applies the load from the back floor 6 to the biting force. Since the braking force can be set so as not to rotate when received, the rotational operation force of the screw shaft 10 in the braking direction can be made as small as possible. More specifically, as shown in FIG. 9, the storage portion 26A has a vertical line passing through the center of the screw shaft 10 toward the braking direction side θ1 (actually 35 °) and the vertical line toward the non-braking direction side. It is formed to have an angle range of θ2 (actually 20 °). Then, the inner surface is drawn by drawing an arc from a position r that is 0.3 mm to the right in the figure from the center point R of the screw shaft 10 (more than 0.3 mm in the figure for the sake of clarity). 26B is formed. The position r is set to the position moved to the right in the horizontal direction, but may be set to the position moved to the upper right or the position moved to the lower right, and the inner surface 26B on the braking direction side is gradually centered. The position r may be set anywhere as long as a gentle arc that is located on the side can be drawn. By forming the inner surface 26B in this way, a small dimensional difference a is generated between the inner surface 26B and the one drawn with a one-dot chain line from the center point R, and the screw shaft 10 is caused by the size of the dimensional difference a. The braking force received by the vehicle is determined. In addition, when the screw shaft 10 is made of metal, the piece member 29 is made of metal, the fixing member 26 is made of synthetic resin, and the dimensional relationship is satisfied, the screw shaft 10 causes the back floor 6 to bite in. However, when the material of the screw shaft 10, the piece member 29, and the fixing member 26 is changed, the biting force can be set to the screw shaft 10. In order to set the braking force so as not to rotate due to the load from the back floor 6, the dimensional relationship is changed and adjusted.
[0014]
As shown in FIG. 8, the blocking means 25 may be composed of a fixed member 26 in which two piece members 29 are accommodated in the respective accommodating portions 26A, 26A. It is not limited. Further, as shown in FIG. 10 (a), the blocking means 25 is composed of a piece member 29 that is fitted into three storage portions 26A formed inside a fixing member 26 that is fitted on the screw shaft 10. In addition, the storage portion 26A is formed so that the storage area of each storage portion 26A decreases toward the braking direction side of the screw shaft 10. In FIG. 10B, the number of the piece members 29 shown in FIG. 10A is two.
[0015]
【The invention's effect】
According to the first aspect, when the floor portion is at the highest position or the lowest position, the lifting drive shaft is lifted or lowered by the operating portion by releasing the linkage between the lifting drive shaft and the push-pull member. Even if is operated, power is not transmitted to the push / pull member simply by rotating the lift drive shaft, so a load is applied to the interlocking portion between the lift drive shaft and the push / pull member, and the converter is damaged. Therefore, it is possible to provide a raising / lowering operation structure for a floor in a bed that can be used satisfactorily for a long period of time. In addition, even without performing a special operation such as locking the operation unit, the lifting drive shaft is reversely rotated by the load from the floor, and the raised floor does not unexpectedly descend, The operability can be improved. In addition, by mechanically interlocking the structure for releasing the interlocking between the lifting drive shaft and the push / pull member, an electrical clutch can be used so that the interlocking between the lifting drive shaft and the push / pull member can be interrupted. Therefore, the structure can be simplified and the reliability of operation can be improved as compared with those that are linked together.
[0017]
According to the second and third aspects of the present invention, by forming the storage portion so as to draw a gentle arc such that the inner surface on the braking direction side is gradually located on the center side, the elevating drive shaft can reduce the biting force of the piece member. Since it is possible to set the braking force so that it does not rotate in response to the load from the floor, the rotational operating force of the drive shaft for lifting in the braking direction can be made as small as possible. While the operation for rotating the shaft in the reverse direction, that is, in the braking direction can be easily performed, the reverse drive shaft can be reliably prevented from rotating in the reverse direction.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a bed. FIG. 2 is a plan view showing a back floor lifting operation structure. FIG. 3 is a partially cutaway side view showing a back floor lifting operation structure. Fig. 5 is a vertical side view showing a main part of the structure. Fig. 5 is a vertical side view showing a mounting portion of the blocking means. Fig. 6 is a perspective view showing a sliding member, a guide member, and a cover cap. FIG. 8 is a longitudinal front view showing another form of the blocking means. FIG. 9 is a vertical front view showing a main part of the blocking means. FIG. 10 (a) and (b) are different views of the blocking means. Longitudinal front view showing form 【Explanation of symbols】
1 1st frame 2 2nd frame 3 Main frame 4 Floor 5 Caster
5a Boss 6 Back floor 7 Lumbar floor 8 Knee floor 9 Leg floor
10 Lifting drive shaft (screw shaft)
10A straight shaft
10B Screw part
11 Universal joint
12 First rod
13 Bracket
14 Second rod
15 Telescopic rod
16 arms
16A recess
17 Crank handle
18 Conversion unit
19 Push-pull member
20 links
21 Sliding member
21A female screw
21B Tooth
22 Guide member
22A Female thread
22B hole
23 Cover cap
23A Male screw
24 Coil spring (elastic body)
25 Blocking means
26 Fixing member
26A compartment
27 Casing
28 screw
29 pieces
30 Spring bearing member θ1, θ2 Angle a Dimensional difference R Center point r Position

Claims (3)

An elevating drive shaft that can be freely rotated by an operation unit is provided, and a push / pull member is interlocked and connected to the elevating drive shaft via a conversion unit that converts its rotational force into axial movement force. to lift operating the floor by the push-pull operation member, a lifting operation structure of the floor portion of the bed formed by interlocked via a link and a push引部member and the floor portion, the lift drive shaft And a sliding member that is externally fitted to the screw shaft and is movable in the longitudinal direction of the screw shaft by rotation of the screw shaft, and moves integrally with the sliding member; and A straight shaft portion without a screw portion, which comprises the conversion portion from the guide member connected to the push-pull member, and is provided at both longitudinal ends of the screw shaft, and the two straight shaft portions, At least when the floor is in the lowest position Configured the sliding member has moved to the straight shaft portion and an elastic body that moves urging the screw portion threaded portion which is formed at the uppermost position and the lowermost position of the floor, the lift drive shaft And a release means for releasing the interlocking with the push-pull member, and a blocking means for preventing the lifting drive shaft from rotating due to a load from the floor. Elevating operation structure. An elevating drive shaft that can be freely rotated by an operation unit is provided, and a push / pull member is interlocked and connected to the elevating drive shaft via a conversion unit that converts its rotational force into axial movement force. In order to raise and lower the floor portion by pushing and pulling the member, the floor portion is raised and lowered in a bed in which the push and pull member and the floor portion are linked and connected via a link. In the ascending position and the most lowered position, there is provided a releasing means for releasing the interlock between the elevating drive shaft and the push / pull member, and a blocking means for preventing the elevating drive shaft from rotating due to a load from the floor portion. Is formed of a piece member that can be moved by rotation of the elevating drive shaft, and the inner surface of the braking direction side is gradually centered. Draw a gentle arc like Elevation operating structure of the floor ing to form the housing portion. The blocking means is constituted by a piece member that can move by rotation of the elevating drive shaft in a storage portion formed inside a fixing member that is externally fitted to the elevating drive shaft, and the inner surface on the braking direction side is gradually increased. 2. The raising / lowering operation structure of the floor part in the bed of Claim 1 which forms the said accommodating part so that the gentle arc which is located in the center side may be drawn.

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