JP2017086950A - Lifting device for bed and stretcher incorporating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow use of a smaller lifting actuator.SOLUTION: There is provided a lifting device 3 for a bed in which a support part 2 for supporting a user is attached to a leg part 1, in a manner of capable of being lifted up and down. The lifting device comprises: a four-node link mechanism 14 formed of a base side pole 14A provided on the leg part 1, a lifting side pole 14B provided on the support part 2, and two parallel links 14C, 14D provided between the base side pole 14A and the lifting side pole 14B; a lifting actuator 15 for vertically oscillating the four-node link mechanism 14; and energization means 16 provided between the base side pole 14A and the lifting side pole 14B, and exhibiting repulsive force in a direction for raising the lifting side pole 14B. The four-node link mechanism 14A is a parallel motion mechanism, in which the parallel links 14C, 14D become horizontal on an intermediate position of a lifting stroke of the support part 2 or in the vicinity of the intermediate position.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an elevating device that changes the height of a support portion that supports a user in a bed, such as a bed or a stretcher, and a stretcher incorporating the same.

  As a stretcher whose height can be adjusted, for example, there is a stretcher disclosed in Patent Document 1. This stretcher is shown in FIG. The bed main body 101 is attached to a leg portion 102 that can travel through an elevating means 103. The lifting / lowering means 103 includes a base-side column 104 provided on the leg 102, a frame column 105 provided on the bottom surface of the bed main body 101, and two elevators for connecting the base-side column 104 and the frame column 105. It is comprised from the stays 106 and 107 and the hydraulic cylinder 108 provided between the leg part 102 and the raising / lowering stay 106. The base-side column 104, the frame column 105, and the elevating stays 106 and 107 constitute a four-bar linkage mechanism as a parallel motion mechanism, and the elevating stay 106 is swung up and down by expanding and contracting the hydraulic cylinder 108. The frame column 105 is raised and lowered without being tilted so that the height of the bed main body 101 can be changed while maintaining the posture of the bed main body 101 horizontally.

Japanese Patent Laid-Open No. 10-85280

  However, the stretcher described above requires a large and expensive hydraulic cylinder 108 in order to smoothly lift and lower the heavy bed body 101. For this reason, the lifting means 103 is increased in size and the manufacturing cost is increased.

  It is an object of the present invention to provide a bed lifting device that can use a small lifting actuator, and a stretcher incorporating the same.

  In order to achieve such an object, the invention according to claim 1 is a bed lifting device in which a support portion is attached to a leg portion so that the support portion can be lifted and lowered, and a base-side column provided on the leg portion and a lifting portion provided on the support portion. A four-bar link mechanism comprising a side column, two parallel links provided between the base column and the elevator column, an elevator actuator for swinging the four-bar link mechanism up and down, and a base column Provided with an urging means that is provided between the lifting column and the lifting column to elevate the lifting column, the four-bar link mechanism is a parallel motion mechanism, and the parallel link is the lifting stroke of the support portion. It is made to become horizontal in the middle position of or near the middle position.

  Accordingly, when the actuator is operated to swing the parallel link upward or downward, the up / down column is raised or lowered to change the height of the support portion. The elevating mechanism is a four-bar linkage mechanism serving as a parallel motion mechanism, and the angle is maintained even when the support portion is raised and lowered. The raising of the support portion by the actuator is assisted by the biasing means. The parallel link of the lifting mechanism is parallel at or near the middle position of the lifting stroke of the support portion, and the swing angle upward from this position is equal to the swing angle downward.

  Further, in the bed lifting device according to claim 2, the leg portion is provided with a storage space for avoiding interference with the lifting column and the two parallel links when lowered. Therefore, when the support portion is lowered, the elevating side support column and the two parallel links of the elevating mechanism can be lowered into the leg portion.

  Further, in the bed lifting device according to claim 3, the base side support column is provided at the front part or the rear part of the leg part, and when the base side support column is provided at the front part of the leg part, the leg part is provided. In the case where a luggage storage portion is provided at the rear and a base side support is provided at the rear of the leg, the luggage storage is provided at the front of the leg. By providing the base side column of the lifting mechanism at the front part or the rear part of the leg part, an empty space is generated on the opposite side (the rear part or the front part of the leg part). A luggage storage unit can be provided by using this empty space.

  Further, in the bed lifting apparatus according to claim 4, the urging means is a gas spring. Therefore, the raising of the support portion by the elevating actuator can be assisted by the gas spring.

  Furthermore, a stretcher according to a fifth aspect of the present invention incorporates the bed lifting device according to any one of the first to fourth aspects.

  In the bed lifting apparatus according to the first aspect, the lifting of the support portion by the actuator can be assisted by the urging means, so that it is possible to use an actuator with a smaller thrust accordingly. Therefore, a small actuator can be adopted, and the lifting mechanism can be reduced in size and weight. For example, when an electric cylinder is used as an actuator, the electric cylinder has a property in which the magnitude of thrust is inversely proportional to the operating speed. Therefore, it is possible to increase the operating speed by adopting a small thrust. It is possible to increase the elevating speed of the support portion. Furthermore, since the urging means always exerts the elastic force in the direction of raising the support portion, even when the force supporting the support portion disappears due to, for example, the failure of the actuator, the sudden drop can be prevented. it can. Therefore, safety can be further improved.

  In the bed lifting / lowering device according to claim 2, since the lifting / lowering support column and the two parallel links of the lifting / lowering mechanism can be lowered into the leg portion when the supporting portion is lowered, the supporting portion can be lowered to a lower position. , Can improve usability.

  In the bed lifting device according to the third aspect, since the base side column of the lifting mechanism is provided at the front part or the rear part of the leg part, an empty space can be generated in the leg part. A luggage storage part can be provided. Therefore, the usability of the lift bed can be further improved.

  In the bed lifting apparatus according to the fourth aspect of the present invention, since the gas spring is used as the biasing means, the lifting of the support portion by the actuator can be assisted without requiring a special power source or the like.

  In the stretcher according to the fifth aspect, since the lifting device for the beds according to any one of the first to fourth aspects is incorporated, a stretcher having the above-described effects can be provided.

It is a side view which shows the stretcher which applied this invention, and shows a mode that the support part was raised in the bed state. It is the side view which shows a mode that the same stretcher was shown and the support part was lowered | hung in the bed state. It is the front view which shows the same stretcher and shows a mode that the support part was raised in the bed state. It is a front view which shows the same stretcher and shows a mode that the support part was lowered | hung in the bed state. It is a side view which shows a mode that the same stretcher was shown and the support part was raised in the chair state. It is a side view which shows the same stretcher and shows a mode that the support part was lowered | hung in the chair state. It is a perspective view which shows a mode that the same stretcher was shown and the support part was raised in the bed state. It is a perspective view which shows the same stretcher and shows a mode that the support part was raised in the chair state. The lifting device of the stretcher is shown, (A) is a side view in the raised state, (B) is a side view at an intermediate position of the lifting stroke of the support portion, and (C) is a side view of the descending housing. The rotary side guard apparatus of the stretcher is shown and is a sectional view in a locked state. The rotary side guard apparatus of the stretcher is shown, and is a sectional view in an unlocked state. It is a figure which shows the locking hole provided in the end surface which faces the movable side block of a fixed side block. It is a figure which shows the relationship between the lower end part of the fence member of an accommodation state, and a shaft. It is a figure which shows other embodiment of a rotary side guard apparatus, and shows the fence member. A further embodiment of the rotary side guard device is shown, (A) is a view showing a state in which the fence member is brought down to a retracted state, (B) is a view showing a state in which the fence member is retracted when hitting an obstacle. It is. It is a side view of the conventional stretcher.

  Hereinafter, the configuration of the present invention will be described in detail based on the form shown in the drawings. Although this embodiment demonstrates the case where it applies to a stretcher as beds, it is not restricted to a stretcher.

  1 to 13 show an example of an embodiment of a stretcher to which the present invention is applied. The stretcher includes a leg portion 1 that can be run, a support portion 2 on which a patient is placed, and an elevating device 3 that attaches the support portion 2 to the leg portion 1 so as to be movable up and down.

  In the present embodiment, for the sake of convenience, the patient's foot side is the front direction and the head side is the rear direction in the front-back direction.

  The leg 1 includes a frame 4 in which the front, rear, left and right frames 4F, 4B, 4L, 4R are connected in a rectangular shape, a guard frame 5 provided below the rear frame 4B of the frame 4, and four corners of the frame 4 The underframe 4 is lifted to a certain height by the wheels 6. In this embodiment, all four wheels are capable of turning by using casters as the wheels 6, but it is not always necessary to make all four wheels turnable.

  The guard frame 5 is substantially U-shaped, and its central portion is arranged in parallel with the rear frame 4B at a predetermined interval, and both ends extend upward and are connected to the left and right frames 4L and 4R. ing. The inner space of the underframe 4 is guarded by the bottom plate 7 and the rear side plate 8. The bottom plate 7 and the rear plate 8 are formed by bending, for example, one punching metal, and the front end of the bottom plate 7 is connected to the lower end of the base side column 14A fixed to the front frame 4F of the underframe 4 so that the rear plate 8 Is connected to the rear frame 4 </ b> B of the underframe 4. A switch mounting plate 9 is connected to the left frame 4L. The switch mounting plate 9 includes a foot switch 10 for operating the lifting / lowering actuator 15 of the lifting / lowering device 3 and a foot switch 11 for operating an actuator (not shown) that deforms the form of the support portion 2 into a bed form and a chair form. It is attached.

  The support part 2 is composed of an upper body support part 2A that mainly supports the upper body of the user, a buttock support part 2B that mainly supports the buttock, and a leg support part 2C that mainly supports the leg part. A leg support portion 2C is connected to the front side and an upper body support portion 2A is connected to the rear side so as to be bendable. For example, a bed configuration (FIGS. 1 to 4 and the like) and a chair configuration (FIGS. 6 etc.). However, the configuration is not limited to the configuration in which the actuator is deformed, and a configuration in which the actuator is manually deformed by operating a lever or the like may be used. The mat 12 of the leg support part 2C is separate from the other parts, but the mat 12 of the upper body support part 2A and the mat 12 of the buttocks support part 2B are connected to form a single sheet. A headrest 13 is provided on the mat 12 of the upper body support portion 2A.

Further, in both the bed form and the chair form, the stretcher releases a lock by operating a lever installed on the head side, and pushes down the upper body support part 2A and the buttocks support member 2B to slightly reduce the head side. It has a function to incline. By tilting backward in the form of a chair, the patient can be prevented from slipping forward. In the bed form, Trendelenberg can be performed when it is necessary to promote blood flow to the head (brain).

In addition, the work for declining the slope can be performed by manual operation, operation by a remote controller incorporating an actuator, or operation by a foot pedal.

  The lifting / lowering device 3 attaches the support part 2 to the leg part 1 so that the support part 2 can be lifted / lowered, and includes a base side column 14A provided on the leg part 1, a lift side column 14B provided on the support part 2, and a base side column 14A. The four-joint link mechanism 14 including two parallel links 14C and 14D provided between the lift-and-lower support 14B, the lift actuator 15 that swings the four-link mechanism 14 up and down, and the base support post There is provided an urging means 16 provided between 14A and the elevating side support column 14B and exhibiting a resilience in the direction of raising the elevating side support column 14B. The base-side column 14A and the lift-side column 14B are provided vertically. Further, the mat 12 of the support portion 2 is provided horizontally.

  In this embodiment, two parallel links 14C and 14D and urging means 16 are provided on both sides of the base-side column 14A and the lift-side column 14B, respectively. However, it is not always necessary to provide the two parallel links 14C and 14D and the urging means 16 on both sides of the base-side column 14A and the lift-side column 14B, and they may be provided only on one side.

  The four-bar link mechanism 14 is a parallel motion mechanism, and a base-side column 14A and a lift-side column 14B, and two parallel links (lifting arms) 14C and 14D are parallel to each other. Therefore, when the lifting / lowering actuator 15 swings the four-bar linkage 14 up and down, the lifting / lowering support column 14B moves up and down without tilting. In the present embodiment, the base-side column 14 </ b> A is fixed to the front frame 4 </ b> F of the base frame 4 of the leg 1, and the lift-side column 14 </ b> B is fixed to the buttocks support portion 2 </ b> B of the support unit 2. The elevating side support column 14B is disposed behind the base side support column 14A. The two parallel links 14C and 14D are connected to the upper part of the lifting / lowering support column 14B and the lower part of the lifting / lowering support column 14B at a predetermined interval.

  The parallel links 14 </ b> C and 14 </ b> D are provided so as to be horizontal at or near the intermediate position of the lifting / lowering stroke of the support portion 2. In this embodiment, it is provided so that it may become horizontal in the intermediate position (position of FIG. 9 (B)) of the raising / lowering stroke of the support part 2. FIG. Therefore, the upward swing angle (α in FIG. 9A) and the downward swing angle (α in FIG. 9C) from the position where the parallel links 14C and 14D are horizontal. Are equal. However, the intermediate position here does not have to be exact, and the position where the parallel links 14C and 14D become horizontal from the intermediate position as long as the amount of movement L1 can be kept within an allowable range as will be described later. It may be slightly shifted (may be near the middle position).

  The raising / lowering actuator 15 of this embodiment is provided between the base side support | pillar 14A and the upper parallel link 14C. However, the position where the lifting / lowering actuator 15 is provided is not limited to this, and may be provided at other positions as long as the four-bar linkage mechanism 14 serving as a parallel motion mechanism can be swung up and down. For example, an elevating actuator 15 may be provided between the frame 4 and the lower parallel link 14D. In the present embodiment, an electric cylinder is used as the lifting actuator 15. However, the present invention is not limited to this, and for example, a gas pressure cylinder, a hydraulic cylinder, or the like may be used. The lifting actuator 15 is operated by the foot switch 10 and a remote control switch (not shown). In the case of an operation with the remote control switch, it is possible to store an arbitrary height by a simple operation such as a long press operation of a button (in this embodiment, two heights can be stored). The height can be automatically moved by operating the switch on the remote control.

  The urging means 16 is provided between the base side column 14A and the lift side column 14B. In this embodiment, the lower parallel link 14D is coupled to the base column 14A, and the upper parallel link 14C is coupled to the lift column 14B. In the present embodiment, a gas spring is used as the biasing means 16, but is not limited thereto. By using a gas spring as the urging means 16, it is possible to assist the raising of the support portion 2 by the elevating actuator 15 without requiring a special power source or the like.

  The urging means 16 is provided so as to exert a resilience in a direction in which the elevating side column 14B is raised. In this embodiment, the urging means 16 is pushed and shrunk when the elevating side support column 14B is lowered, and the force that the urging means 16 tries to extend when the elevating side support column 14B is raised is used.

  When the up / down actuator 15 is operated to swing the upper parallel link 14C upward or downward, the up / down column 14B is raised or lowered to change the height of the support 2. Each link of the elevating device 3 constitutes a four-bar link mechanism 14 serving as a parallel motion mechanism, and the vertical state is maintained even when the support portion 2 is raised and lowered. Therefore, the support part 2 can be raised and lowered while being horizontal.

  The lifting device 3 is provided with a biasing means 16, and the lifting of the support portion 2 by the lifting actuator 15 can be assisted by the biasing means 16, so the lifting actuator 15 having a smaller thrust is used accordingly. It becomes possible to do. Therefore, a small actuator can be employed, and the lifting device 3 can be reduced in size and weight.

  In the present embodiment, an electric cylinder is employed as the lifting actuator 15. Since the electric cylinder has a property in which the magnitude of the thrust and the operating speed are inversely proportional to each other, the operating speed can be increased by adopting a small thrust, and the lifting / lowering speed of the support portion 2 can be increased. . Therefore, the usability of the stretcher is improved.

  Further, since the urging means 16 always exerts a resilient force in the direction of raising the support portion 2, for example, even when the force supporting the support portion 2 disappears due to a failure of the lifting / lowering actuator 15 or the like, the sudden force Falling can be prevented. Therefore, safety can be further improved.

  In the lifting / lowering device 3 configured to swing the two parallel links 14C and 14D up and down to raise and lower the lifting / lowering support column 14B, a movement amount L1 is generated in the horizontal direction as the parallel links 14C and 14D swing. FIG. 9). Since the lifting / lowering device 3 is arranged so that the parallel links 14C and 14D are parallel at the intermediate position of the lifting / lowering stroke of the support portion 2, the upward swing angle (α in FIG. 9A) from the intermediate position. And the downward swing angle (α in FIG. 9C) can be made equal, and the movement amount L1 can be minimized. Therefore, it is possible to reduce the amount of horizontal movement of the support portion 2 that accompanies raising and lowering, to improve usability at the time of medical examination, etc., and to be able to be installed near the wall, which also improves usability. Can do.

  In the present embodiment, a luggage storage portion 17 is provided on the leg portion 1. Since the base side column 14A of this embodiment is fixed to the front frame 4F of the underframe 4, it is provided at the front part of the leg part 1, and the luggage storage part 17 is provided at the rear part on the opposite side. . In the present embodiment, the luggage storage portion 17 is formed by providing a recess on the upper surface of the rear frame 4B.

  In this way, by providing the base side column 14A of the lifting mechanism at the front part of the leg part 1, an empty space can be generated at the rear part of the leg part 1, and the luggage storage part 17 can be formed using this empty space. Can be provided. Therefore, the usability of the stretcher can be further improved.

  In addition, the leg portion 1 of the present embodiment is provided with a storage space 18 that avoids interference with the up-and-down column 14B and the two parallel links 14C and 14D when lowered. In the present embodiment, a space guarded by the bottom plate 7 and the rear side plate 8 inside the underframe 4 is used as the accommodation space 18.

  As described above, by providing the accommodation space 18 in the support portion 2, the lifting column 3 </ b> B of the lifting device 3 and the two parallel links 14 </ b> C and 14 </ b> D can be lowered into the leg portion 1 when the support portion 2 is lowered. Therefore, the support part 2 can be lowered to a lower position, and the usability of the stretcher can be further improved.

  The stretcher is provided with a rotary side guard device 19. The rotary side guard device 19 rotatably attaches a fence member 21 to the side edge of the height-adjustable support portion 2 that supports the user via a shaft 20 along the width direction of the support portion 2. The fence member 21 is stowed and stored at a position lower than the surface 39 that supports the user during storage.

  Details of the rotary side guard device 19 are shown in FIGS. The fence member 21 is attached to the support portion 2 via the shaft support means 22. In this embodiment, it is attached to the mat 12 of the support portion 2. The shaft support means 22 includes a fixed portion and a movable portion, and the fixed portion includes a fixing member 23 fixed to the mat 12 and a fixed side block 24 attached to the fixing member 23. For example, the fixing member 23 is attached to the bottom surface of the mat 12 by fastening means such as screws (not shown). However, the means for attaching the fixing member 23 to the mat 12 is not limited to the fastening means. Further, the fixing member 23 may be attached to a member other than the mat 12, for example, it may be attached to a frame or the like (not shown).

  The fixed block 24 has a cylindrical shape, for example, and is provided with a hole 24a at the center. The inner end face and the peripheral surface of the stationary block 24 are attached to the fixing member 23 by fastening means 25 and 26 such as bolts, for example, but the attaching means is not limited to this. In the present embodiment, the bolt 26 that attaches the peripheral surface of the fixed block 24 to the fixing member 23 is used as the pin member 36 of the rotation limiting mechanism 34. However, the bolt 26 and the pin member 36 may be provided separately.

  The movable portion of the shaft support means 22 includes an outer cylinder 27 that is rotatably fitted in the fixed side block 24, and a movable side block 28 that is accommodated in the outer cylinder 27 together with being abutted against the fixed side block 24. The slide shaft (shaft 20) inserted into the center hole 28a of the movable side block 28 and the center hole 24a of the fixed side block 24, the support piece 29 penetrating the slide shaft 20 in the radial direction, and the support piece 29 are attached. The lock pin 30 and the return spring 31 that constantly urges the slide shaft 20 toward the fixed side block 24 are provided. The slide shaft 20 is slidable in the length direction. A fence support member 32 that supports the fence member 21 is fixed to the outer cylinder 27 by fixing means such as welding. Therefore, the fence member 21 rotates integrally with the movable part of the shaft support means 22.

  The end face (outer end face) 24b facing the movable block 28 of the fixed block 24 is provided with a locking hole 24c into which the lock pin 30 is inserted (FIG. 12). An operation grip 33 is attached to the outer end of the slide shaft 20. By pulling the operation grip 33 while the return spring 31 is contracted, the slide shaft 20, the support piece 29, and the lock pin 30 are slid to engage the lock pin 30. It can be pulled out from the stop hole 24c and unlocked (FIG. 11). In the unlocked state, the movable portion of the shaft support means 22 can be rotated with respect to the fixed side block 24.

  When the pulling operation of the operation grip 33 is stopped, the slide shaft 20, the support piece 29, and the lock pin 30 are pulled toward the fixed block 24 by the return spring 31. In this case, since the lock pin 30 does not enter the locking hole 24c when the lock pin 30 is displaced from the locking hole 24c, the lock pin 30 is not locked and the movable part of the shaft support means 22 is rotated with respect to the fixed side block 24. Can be made. On the other hand, when the lock pin 30 faces the locking hole 24c, the lock pin 30 enters the locking hole 24c and is locked (FIG. 10). In the locked state, the movable part of the shaft support means 22 cannot be rotated with respect to the fixed side block 24.

  As described above, the locking mechanism includes the locking hole 24c, the lock pin 30, the return spring 31, and the slide shaft 20, and is locked to the support portion 2 in a state where the fence member 21 is upright. . In this lock mechanism, as described above, the fence member 21 can be locked (locked) or released (unlocked) by the slide operation of the slide shaft 20. Simple and easy to use. Moreover, the structure for locking becomes simple, and an increase in manufacturing cost can be suppressed. Furthermore, since the fence member 21 can be locked in use, the sense of security during use can be increased. Moreover, since the fence member 21 can be kept in a free state without being locked in the housed state, pinching is prevented and safety can be further improved.

  In the present embodiment, a locking hole 24c is provided in the fixed side block 24 of the fixing portion of the shaft support means 22 which is a member on the support portion 2 side, and the lock pin 30 is provided on the support piece 29 which is a member on the shaft 20 side. Although attached, the member which provides the locking hole 24c and the member which attaches the lock pin 30 are not restricted to these. For example, the locking hole 24 c may be provided in the frame (not shown) of the support portion 2, the fixing member 23 of the fixing portion of the shaft support means 22, or the lock pin 30 may be directly provided in the shaft 20. Further, the relationship between the support portion 2 side and the shaft 20 side may be reversed, and the locking hole 24c may be provided on the shaft 20 side, and the lock pin 30 may be provided on the support portion 2 side.

  In the present embodiment, two combinations of the lock pin 30 and the locking hole 24c are provided, but the combination is not limited to two. The two combinations are provided at equidistant positions from the center on the same diameter (see FIG. 12), but are not limited to this arrangement. Since the combination of the two sets of the lock pin 30 and the locking hole 24c is provided at the same diameter position, as will be described later, in this embodiment in which the tilt angle of the fence member 21 is limited to 90 degrees, the fence member Although it is locked in a state where it is set up (used state), it is not locked in a stored state.

  A rotation limiting mechanism 34 is provided between the fixed side block 24 and the movable part of the shaft support means 22, and the angle at which the movable part of the shaft support means 22 can rotate (the tilt angle of the fence member 21) is limited. . The rotation limiting mechanism 34 of this embodiment is composed of a long hole 35 provided in the peripheral surface of the outer cylinder 27 and a pin member 36 that passes through the long hole 35. If it can restrict | limit, it will not be restricted to this structure. The long hole 35 is formed elongated along the circumferential direction of the outer cylinder 27, and when the outer cylinder 27 rotates about the fixed side block 24, the pin member 36 relatively moves in the long hole 35. Therefore, the rotatable angle of the outer cylinder 27 is limited to a range in which the pin member 36 can relatively move within the long hole 35, and the rotatable angle of the outer cylinder 27, that is, the fence member 21 can be adjusted by adjusting the length of the long hole 35. The tilt angle can be adjusted. The rotation limiting mechanism 34 of the present embodiment limits the tilt angle of the fence member 21 to 90 degrees.

  In this embodiment, although the fence member 21 is plate-shaped, it is not restricted to plate shape. For example, a frame shape, a mesh shape, or the like may be used.

  When the fence member 21 is stored, that is, in a state where the fence member 21 is tilted to a position lower than the surface (the upper surface of the mat 12) 39 that supports the user, the lower end portion 21a of the fence member 21 comes off from directly below the shaft 20 as viewed from the width direction of the stretcher. (FIG. 13). In this embodiment, the shaft 20 is provided at a position off the center of the fence member 21 when viewed from the width direction of the stretcher, and the tilt angle of the fence member 21 is set to an angle other than 180 degrees. The lower end portion 21 a of the member 21 is made to come off from directly below the shaft 20. Here, the amount of deviation L2 from directly below the axis 20 is maximized when the tilt angle is 90 degrees, so it is preferable to set the tilt angle to a value close to 90 degrees.

  However, the means for allowing the lower end portion 21a of the fence member 21 to be detached from directly below the shaft 20 in the housed state is not limited to this. For example, as shown in FIG. 14, the lower end 21 a of the fence member 21 may be partially protruded so that the lower end 21 a is provided at a position off the shaft 20 (in this case, the fence member 21 It is possible to set the tilt angle to 180 degrees).

  Moreover, in this embodiment, as shown in FIG. 13, the shape of the fence member 21 is made into a substantially trapezoid, and when the shape of the edge 37 on the shaft 20 side hits an obstacle, an upward rotational force is generated. Tapered shape. That is, the edge 37 on the shaft 20 side of the fence member 21 in the stored state is inclined in the direction of narrowing the width of the lower end portion 21a. By doing in this way, even when the edge 37 on the shaft 20 side of the fence member 21 and the portion on the shaft 20 side of the lower end portion 21a hit an obstacle, it can be reliably rotated in the upward direction. Therefore, the fence member 21 can be reliably retracted when it hits an obstacle.

  Locking of the fence member 21 by the shaft support means 22 is performed in a state where the fence member 21 is raised (use state), and the lock is released in the housed state. Therefore, the fence member 21 is allowed to rotate upward in the stored state.

  In the present embodiment, fence members 21 are provided on both sides of the buttocks support portion 2B and the upper body support portion 2A. However, the position where the fence member 21 is provided is not limited to this. Moreover, although the fence member 21 is provided in four places in this embodiment, the number of installation is not restricted to this.

  When the fence member 21 is tilted and stored, the fence member 21 protrudes downward. FIG. 4 shows the positional relationship between the fence member 21 and the leg portion 1 when the support portion 2 is lowered in this state. As shown by a two-dot chain line in FIG. 4, the lower end portion 21 a of the fence member 21 is lower than the base frame 4 of the leg portion 1. Moreover, the space | interval L3 of the lower end part 21a and the frame 4 is slight.

  Therefore, if the support part 2 is lowered while the fence member 21 is housed, the fence member 21 protruding downward may hit an obstacle. For example, when the supporter 2 is lowered with the foot placed on the frame 4 of the leg 1, the lower end 21 a of the fence member 21 may hit the caregiver's foot. The lower end 21 a of the fence member 21, that is, the position where it hits the obstacle is off from directly below the shaft 20, and the fence member 21 hitting the obstacle generates a rotational force in the direction of lifting it. Since the upward rotation of the fence member 21 is allowed in the housed state, the fence member 21 is pushed by the obstacle and rotates and retracts. Therefore, interference between the obstacle and the fence member 21 can be avoided, and damage to the fence member 21 and the obstacle can be prevented.

  In addition, since each of the rotary side guard devices 19 is independent of each other, the necessary medical items can be smoothly stored while ensuring the safety of the patient to be used by storing the necessary minimum items. Can do.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention.

  For example, in the above description, the stretcher is described as an example of a bed that can move the support portion 2 up and down. However, the stretcher is not limited to the stretcher as long as the support portion 2 can be lifted and lowered. For example, the present invention may be applied to a bed whose height is adjustable, an inspection bed, an operating table, or the like.

  Further, in the above description, the base-side column 14A is fixed to the front portion of the leg portion 1 and the luggage storage portion 17 is provided to the rear portion. Conversely, the base-side column 14A is fixed to the rear portion of the leg portion 1. The luggage storage unit 17 may be provided at the front.

  In the above description, the parallel links 14C and 14D of the lifting mechanism are provided in the front-rear direction of the stretcher, but may be provided in the width direction. That is, the base-side column 14A of the lifting mechanism may be fixed to the right part or the left part of the leg part 1, and the parallel links 14C and 14D may be provided in the width direction of the stretcher. In this case, the horizontal movement accompanying the raising / lowering of the support part 2 can be made into the width direction of a stretcher.

  Further, in the above description, the fence member 21 is rotated around the shaft 20 at the time of collision with an obstacle, but is not necessarily limited to this configuration. For example, as shown in FIG. 15, the fence support member 32 is rotatably connected to the fence member 21 by the second shaft 38, and the rotation center at the time of storage and the rotation center at the time of retraction from the obstacle are separated. May be. That is, when tilting to store the fence member 21, the axis 20 is rotated around the axis (FIG. 15A), and when colliding with an obstacle, the fence member 21 is rotated around the second axis 38. You may make it evacuate (FIG.15 (B)).

DESCRIPTION OF SYMBOLS 1 Leg part 2 Support part 3 Lifting device 14 Four-bar linkage mechanism (parallel motion mechanism)
14A Base side column 14B Elevating side column 14C, 14D Two parallel links 15 Lifting actuator 16 Biasing means (gas spring)
17 Luggage storage 18 Storage space

Claims (5)

  In a lifting device for a bed or the like in which a support portion that supports a user is attached to a leg portion so as to be movable up and down, a base-side column provided on the leg portion, an elevation-side column provided on the support unit, and the base-side column A four-bar link mechanism comprising two parallel links provided between the up-and-down struts, a lift actuator for swinging the four-bar link mechanism up and down, and the base-side struts and the up-and-down struts And a biasing means that exerts a resilient force in the direction of raising the lifting side column, the four-bar link mechanism is a parallel motion mechanism, and the parallel link is a lifting stroke of the support portion. A lifting device for beds, which is horizontal at or near the intermediate position.   The bed lifting / lowering apparatus according to claim 1, wherein a storage space for avoiding interference with the lifting / lowering support column and the two parallel links at the time of lowering is provided in the leg portion.   The base side strut is provided at the front or rear of the leg, and when the base side strut is provided at the front of the leg, a luggage storage portion is provided at the rear of the leg. The bed lifting apparatus according to claim 1 or 2, wherein when the base side support column is provided at the rear part of the leg part, a luggage storage part is provided at the front part of the leg part.   The lifting device for beds according to any one of claims 1 to 3, wherein the biasing means is a gas spring.   A stretcher comprising the bed lifting device according to any one of claims 1 to 4.

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