JP6549967B2 - Wheelchair reverse protection device - Google Patents

Description

  The present invention relates to a wheelchair reverse movement prevention device that prevents a wheelchair from moving backward when the wheelchair is pulled up along stairs with the wheelchair facing backward.

  In recent years, with the enhancement of the nursing care system due to the aging of the population, a wide variety of wheelchairs have been developed, and there are wheelchairs with a stair-lifting function.

  Also, as a method of raising the wheelchair to the stairs, there is a method of using an auxiliary device such as a slope, a method of using equipment such as an elevator moving up and down along a handrail, etc. is there. However, both methods have disadvantages. Specifically, a wheelchair with a stair-lifting function is large and can not be easily turned. In addition, it is necessary to always carry accessories such as slopes. The installation place of the equipment such as the elevator is limited.

  For this reason, in general, there are many cases in which the wheelchair is manually raised to the stairs. As a method of raising the wheelchair to the stairs manually, it is recommended to lift the wheelchair from the stairs with the wheelchair facing backwards.

  Driving direction of the wheelchair with the front of the stairs on the stairs and pushing the wheelchair upward from the stairs tends to be misunderstood as correct, but it is not recommended and dangerous. Pushing the wheelchair from the back The posture of the carer is lower back than the foot (lower side of the stairs) and lacks stability. In addition, it is necessary to move up the front wheel of the wheelchair to raise the front wheel of the wheelchair. I have to tilt. In addition, the carer is more upset because he is in an unstable wheelchair in an upturn position, increasing anxiety.

  The method of lifting the wheelchair by multiple carers shakes like a shrine carried by the wheelchair if all the carers are not in time, and the cared person is apprehensive. In addition, a burden is placed on the caregiver's wrist and waist.

JP 2000-203396 A Japanese Patent Application Laid-Open No. 11-28231 Utility model registration 3156286 gazette

  By the way, even if it is the above-mentioned recommended method, ie, the method of pulling up a wheelchair backward, there was a problem that a burden on a body of a carer is large and a cared person has a large sense of anxiety. For example, when pulling up a wheelchair by hand and going up the stairs, the caregiver must alternate between lifting the wheelchair and the operation of the carer's brake with grip force, causing the carer's grip to fall off. There is also known an accident case in which the hand dropped from the steering wheel and the wheelchair fell.

  Therefore, an object of the present invention is to provide a reverse movement prevention device for a wheelchair, which can reduce the burden on the body of the carer and can reduce the anxiety of the cared person.

  In order to achieve the above object, the present invention is to prevent the rear wheel tires of the wheelchair from rolling along the stairs and causing the wheelchair to fall when the wheelchair is pulled up along the stairs with the wheelchair facing backwards. A reverse movement preventing device for a wheelchair, provided rotatably on a frame of the wheelchair via a bracket, with respect to a line connecting a support shaft thereof and an axial center of the rear wheel tire; An anti-reverse arm that extends in contact with the rear rear wheel tire and whose tip contacts the rear wheel tire, and an arm that holds and presses the anti-reverse arm in the rear anti-reverse position of the rear wheel tire when pulling up the stairs of the wheelchair And a driving means.

  According to the present invention, it is possible to reduce the burden on the body of the caregiver and to reduce the anxiety of the care recipient.

It is a side view of a reverse travel prevention device for wheelchairs concerning a 1 embodiment of the present invention. It is the sectional view on the AA line of FIG. It is a side view of the wheelchair reverse movement prevention device which has stopped reverse movement of the wheelchair. It is a side view of the state which pulls up a wheelchair by man power on stairs. It is a side view of the wheelchair reverse travel prevention device which canceled the stopper function.

  Hereinafter, preferred embodiments of the present invention will be described in accordance with the attached drawings.

  As shown in FIG. 1 and FIG. 4, when the wheelchair reverse movement prevention device 1 makes the wheelchair 2 face backward and pulls up along the stairs 4 with the rear wheel tire 3 grounded, the rear wheel of the wheelchair 2 The tire 3 rolls along the stairs 4 to prevent the wheelchair 2 from falling. The wheelchair reverse movement prevention device 1 is provided on the left and right sides of the wheelchair 2. The reverse movement preventing device 1 for a wheelchair is rotatably provided on the frame 5 of the wheelchair 2 via the first bracket 6 and has a reverse movement preventing arm 7 whose tip is in contact with the rear wheel tire 3. And arm biasing means 8 for holding and pressing the anti-advancing arm 7 at the reverse-travel preventing position of the rear wheel tire 3.

  The first bracket 6 is detachably attached to the frame 5 in front of the armrest 2 a of the wheelchair 2 with a bolt, a nut or the like, and extends in the direction of the rear wheel tire 3 (obliquely downward) of the wheelchair 2.

  The reverse travel preventing arm 7 is rotatably supported by the first bracket 6 about an axis extending in the left-right direction of the wheelchair 2. The reverse travel preventing arm 7 is located rearward of the forward direction of the rear wheel tire 3 with respect to a line L1 connecting the support shaft (rotation center) 7a of the reverse travel preventing arm 7 and the axial center (rotation center) 3a of the rear wheel tire 3 It extends in contact with the rear wheel tire 3 (rearward in the reverse direction when pulled backward in the step 4).

  As shown in FIGS. 1 and 2, the reverse travel preventing arm 7 includes an arm body 9 extending linearly from the first bracket 6, and an outer extending portion 10 provided at the tip of the arm body 9 and extending outward in the vehicle width direction. The arm main body 9 is provided with a radial extension, and an urging force transmitting portion 11 for transmitting the urging force from the arm urging means 8 described later to the arm main body 9.

  The arm main body 9 includes a proximal end arm 12 formed in a tubular shape having a rectangular cross section, a distal end arm 13 in which the proximal end is inserted in the proximal end arm 12, and a proximal end arm 12 And a fixing bolt 14 for penetrating the radial direction and for fixing the distal end side arm portion 13. The arm body 9 is adjustable in length by adjusting the insertion depth of the distal end side arm portion 13 with respect to the proximal end side arm portion 12. Further, the arm body 9 is formed in a rectangular cross section so that the distal end side arm portion 13 does not twist with respect to the proximal end arm portion 12.

  The outer extending portion 10 is formed in a rod shape, and on the base end side of the outer extending portion 10, a stopper portion 15 that contacts the rear wheel tire 3 is provided. The stopper portion 15 is made of urethane having a medium softness, which is an elastic body formed in a cylindrical shape, and is provided on the outer periphery on the proximal end side of the outer extending portion 10. An operation handle 16 for switching between the operation and non-operation of the reverse travel preventing arm 7 is formed on the outwardly extending portion 10 on the tip end side of the stopper portion 15. The stopper portion 15 is not limited to urethane. The stopper portion 15 may be made of an elastic material made of another material as long as it deforms in the same manner as urethane when it bites into the rear wheel tire 3 and its shape is restored by its own elasticity.

  The biasing force transmitting portion 11 is provided on the distal end side arm portion 13 so as to extend upward (a side opposite to the rear wheel tire 3).

  The arm biasing means 8 includes a second bracket 17 detachably attached to the frame 5 of the wheelchair 2 and a spring plunger 18 pivotally supported by the second bracket 17.

  The second bracket 17 is detachably attached to the frame 5 at the rear of the armrest 2 a of the wheelchair 2 with a bolt, a nut or the like, and extends in the direction (downward) of the rear wheel tire 3 of the wheelchair 2.

  One end of the spring plunger 18 is rotatably connected to the second bracket 17, and the other end is connected to the biasing force transmitting portion 11 of the arm body 9. The spring plunger 18 is provided with a cylinder 19, a coil spring (not shown) built in the cylinder 19, and a piston rod 20 which is provided retractably in the cylinder 19 and biased in a direction to project from the cylinder 19 by the coil spring. And an intermediate connection member 21 provided on the tip end side of the piston rod 20 so as to be positionally adjustable in the longitudinal direction and rotatably coupled to the tip of the biasing force transmission unit 11. The intermediate connection member 21 adjusts the biasing force of the spring plunger 18 by adjusting the mounting position with respect to the piston rod 20.

  As shown in FIG. 5, by attaching the first bracket 6 and the second bracket 17 to the frame 5 before and after the armrest 2a, the support shaft 7a of the reverse travel preventing arm 7 and the support shaft 18a of the spring plunger 18 are rear wheels. It is spaced apart in the tangential direction of the tire 3. The reverse travel preventing arm 7 is moved by moving the connecting shaft 21a connecting the spring plunger 18 and the reverse travel preventing arm 7 upward (against the rear tire side) from a line L2 connecting the pair of support shafts 7a and 18a. It is held in a posture separated from the rear wheel tire 3.

  Although the cylinder 19 is connected to the second bracket 17 and the piston rod 20 is connected to the arm body 9, it may be reversed. Also, the spring plunger 18 is not limited to one that biases the piston rod 20 with a coil spring. For example, the spring plunger 18 may bias the piston rod 20 with the pressure of gas or air enclosed in the cylinder 19 or may hydraulically bias the piston rod 20.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 4, when raising the wheelchair 2 along the stairs 4 with the wheelchair 2 facing backwards, after turning the wheelchair 2 backwards under the stairs, turn the reverse travel preventing arm 7 to the rear tire 3 side. Contact with the rear wheel tire 3. Thereafter, the handle 22 of the wheelchair 2 is pulled from the stairs to raise the wheelchair 2 one step. At this time, the reverse travel preventing arm 7 contacts the rear wheel tire 3 on the rotational direction C side of the rear wheel tire 3 from the line L1 connecting the support shaft 7a of the reverse travel preventing arm 7 and the axial center 3a of the rear wheel tire 3 Therefore, the rotation of the rear wheel tire 3 is not disturbed.

  In addition, when the rear wheel tire 3 finely moves in the reverse rotation direction C '(in the direction of rolling down the stairs), the stopper portion 15 of the reverse travel preventing arm 7 bites into the rear wheel tire 3 as shown in FIG. Regulate reverse. At this time, the stopper portion 15 made of urethane is deformed, and the contact area with the rear wheel tire 3 is increased, thereby stopping the reverse rotation of the rear wheel tire 3 more firmly. The timing at which the reverse travel preventing arm 7 stops the reverse rotation of the rear wheel tire 3 is earlier than the timing at which the carer grips the carer's brake (not shown). Therefore, the reverse rotation of the rear wheel tire 3 can be prevented without using the carer's brake, and the physical burden on the carer can be reduced. And since the wheelchair 2 climbs the stairs 4 stably without going backward, the anxiety of the care recipient can be reduced.

  The stopper portion 15 biting into the rear wheel tire 3 is easily returned to the state before biting by the rotation of the rear wheel tire 3 in the rotational direction C.

  When the wheelchair 2 reaches the top step of the stairs 4, the operation handle 16 is pulled upward to separate the reverse travel preventing arm 7 from the rear wheel tire 3. The connecting shaft 21a connecting the spring plunger 18 and the reverse travel preventing arm 7 is moved to the side opposite to the rear wheel tire from a line L2 connecting the support shaft 7a of the reverse travel preventing arm 7 and the support shaft 18a of the spring plunger 18 As a result, the reverse travel preventing arm 7 is pushed upward by the biasing force from the spring plunger 18 and held in a posture separated from the rear wheel tire 3. After this, the wheelchair 2 is turned to be forward with respect to the traveling direction, and the wheelchair 2 is run. Since the reverse travel preventing arms 7 are held on both sides of the wheelchair 2 in a posture separated from the rear wheel tire 3, the wheelchair 2 can be handled by a conventional operation without becoming an obstacle to the traveling of the wheelchair 2.

  Also, when pushing down the wheelchair 2 and getting off the stairs 4, the caregiver keeps the reverse movement preventing arm 7 away from the rear wheel tire 3, holds the carer's brake together with the handle 22 of the wheelchair 2, It is good to leave the stairs 4 a little while leaving the brake slightly.

  Thus, the reverse advancing direction of the rear wheel tire 3 with respect to the line L1 connecting the support shaft 7a and the axial center 3a of the rear wheel tire 3 rotatably provided on the frame 5 of the wheelchair 2 via the first bracket 6 A reverse travel preventing arm 7 extending so as to contact the rear rear wheel tire 3 and having a tip in contact with the rear wheel tire 3 and holding the reverse travel preventing arm 7 at the reverse travel preventing position of the rear wheel tire 3 when pulling up the stairs of the wheelchair 2 Since the arm biasing means 8 for pressing is provided, the wheelchair 2 can be pulled up on the stairs without operating the carer's brake, and the burden on the carer's body can be reduced. And since the wheelchair 2 can be pulled up stably, an anxious feeling of a care recipient can be reduced.

  The arm biasing means 8 is provided with a spring plunger 18 rotatably provided at one end on the frame 5 via the bracket and at the other end rotatably provided on the reverse travel preventing arm 7, so that the reverse for wheelchair is reversed. The advance prevention device 1 can be made lightweight with a simple structure. Then, the reverse travel preventing arm 7 can be reliably pressed against the rear wheel tire 3, and reverse travel of the wheelchair 2 can be reliably prevented.

  The support shaft 7a of the reverse travel preventing arm 7 and the support shaft 18a of the spring plunger 18 are separated in the tangential direction of the rear wheel tire 3, and in the spring plunger 18, the connecting shaft 21a with the reverse travel prevent arm 7 is a pair of support shafts The reverse travel preventing arm 7 can be held at a position away from the rear wheel tire 3 with a simple structure since it is formed to be movable toward the rear wheel tire side from the line L2 connecting the 7a and 18a.

  Since the reverse travel preventing arm 7 is formed to be adjustable in length, it can be used corresponding to various wheelchairs 2 in which the size of the rear wheel tire 3 and the height of the frame 5 before and after the armrest 2a are different. it can.

  The anti-reverse movement arm 7 has the stopper portion 15 formed of an elastic member in contact with the rear wheel tire 3. Therefore, even if the stopper portion 15 bites into the rear wheel tire 3, the rear wheel tire 3 can be prevented from being damaged. .

  Since the first bracket 6 and the arm urging means 8 are provided detachably with respect to the frame 5, the existing wheelchair 2 can be retrofitted without requiring any modification or the like. For example, when the wheelchair 2 is replaced, the wheelchair reverse movement prevention device 1 can be easily transferred from the existing wheelchair 2 to a new wheelchair.

  In addition, when the reverse travel preventing arm 7 is held at a position separated from the rear wheel tire 3, the wheelchair reverse travel preventing device 1 prevents the reverse travel preventing arm 7 from falling and the reverse travel preventing arm 7 or the spring is used. It may be further provided with a hook (not shown) for hooking the plunger 18.

1 wheelchair reverse movement preventing device 2 wheelchair 3 rear wheel tire 3a shaft center 4 stair 5 frame 6 first bracket 7 reverse motion preventing arm 7a support shaft 8 arm biasing means L1 wire

Claims (6)

A wheelchair reverse movement prevention device for preventing a rear wheel tire of a wheelchair from rolling along the stairs and dropping the wheelchair when pulling up the stairs with the wheelchair facing backward,
It is provided rotatably on the frame of the wheelchair via a bracket and extends so as to contact the rear tire in the reverse traveling direction of the rear tire with respect to a line connecting the support shaft and the axial center of the rear tire. It is characterized by comprising a reverse movement preventing arm whose tip is in contact with the rear wheel tire, and an arm biasing means for holding and pressing the reverse movement prevention arm at the reverse movement preventing position of the rear wheel tire when pulling up the stairs of the wheelchair. Reverse movement prevention device for wheelchairs.   The wheelchair according to claim 1, wherein said arm biasing means comprises a spring plunger having one end rotatably mounted on said frame via a bracket and the other end rotatably mounted on said reverse travel preventing arm. Reverse movement prevention device.   A support shaft of the reverse travel preventing arm and a support shaft of the spring plunger are separated in a tangential direction of the rear wheel tire, and a connection shaft of the spring plunger with the reverse travel prevent arm connects the pair of support shafts The wheelchair reverse movement prevention device according to claim 2, wherein the device is configured to be movable from the line to the anti-rear wheel tire side.   The wheelchair reverse movement prevention device according to claim 2 or 3, wherein the reverse movement prevention arm is formed to be adjustable in length.   The said reverse movement prevention arm has a stopper part which consists of an elastic body contact | abutted with the said rear wheel tire, The reverse movement prevention apparatus for wheelchairs in any one of Claim 1 to 4.   The wheelchair reverse movement prevention device according to any one of claims 1 to 5, wherein the bracket and the arm biasing means are provided detachably with respect to the frame.

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