JP3160595U - Wheelchair brake device - Google Patents

Abstract

Disclosed is a brake device that is inexpensive and can be mounted on a vehicle in use by an additional process for preventing an accident that occurs when the wheelchair moves backward when standing up from the wheelchair. According to the present invention, the vertical movement of the seat depending on whether or not a passenger is seated on the seat of the wheelchair is applied to the rocker 108 newly attached to the brake shoe 557 of the existing brake device on the wheelchair by a mechanical link. In other words, when the occupant stands up, the mechanical link is pressed against the tire tread surface by the mechanical link, and the rocker is bitten into the tire by a slight backward movement of the tire so as to suppress the backward movement. [Selection] Figure 1

Description

The present invention relates to an improvement of a brake device that is attached to a wheelchair, and is intended to suppress unexpected accidents caused by the wheelchair retreating when a passenger stands up. There is a feature in that it can be attached to.

Detailed description of the invention

As a measure for preventing an accident that the wheelchair retreats and causes an unexpected fall accident when standing up from a wheelchair, for example, in Patent Document 1, when a passenger sits on a wheelchair, the seat is lowered, When the seat portion is separated from the seat portion, the seat portion adjustment portion that returns the seat portion to the original position, the delay portion that delays transmission by extending the seat portion according to the lowering of the seat portion, and the lowering portion of the seat portion are transmitted from the delay portion There is a description of a wheel drive unit in which the braking force of the wheel is released, and a braking device. This device is designed with safety in mind, such as speeding up the returning speed of the seat when it rises rather than the descending speed of the seat when it is seated.
In Patent Document 2, a brake device that is operated based on a signal from a seating sensor is disposed at a position adjacent to the rolling surface of the rear wheel of the wheelchair. The brake device includes a first stop position where a tip of the swinging blade comes into contact with the rolling surface of the tire at an acute angle based on a signal from the seating sensor, and a second position spaced apart from the tire rolling surface. The position is controlled.
Further, in Patent Document 3, a wheelchair user transmits a vertical movement of a seat surface when standing up from a seated state by a wire so that a brake shoe brakes a wheel rim.

JP, 2006-198238, A Claims 1, Claim 2, FIG. 1, [0011], [0012] JP, 2009-189599, A Claims 1, 2, and FIG. 1, [0004] to [0006] JP, 2004-16406, A Claims 1, Drawing 1, [0009]-[0012]

  Each of the brake devices described in Patent Documents 1 to 3 is a newly installed one-system brake system in a wheelchair, has a large number of parts including strength members, and has to be expensive in price. . Furthermore, it seems difficult to remodel and install the wheelchair in use because it requires a major modification.

Further, with respect to Patent Document 3, there is anxiety that a sufficient braking force can be expected by pushing up the seating surface of the seating surface, and even if a strong braking force can be obtained, the adjustment of the elongation due to the secular change of the wire is possible. There are concerns about problems.
The purpose of the present invention is to add a minimal amount of inexpensive parts to a standard type of wheelchair, including the wheelchair in use, so that the wheelchair moves backward when the user stands up. It is in providing the brake device which suppresses. A wheelchair equipped with a standard brake device in an existing wheelchair targeted by the present invention will be described.

  An example of a standard wheelchair on the market that is the subject of the present invention will be described with reference to FIGS. FIG. 10 is an overall perspective view of a wheelchair equipped with a standard brake device. FIG. 11 is an enlarged left perspective view of the brake portion of FIG. In FIG. 10, 51 is a wheelchair. In the wheelchair 51, 52 is a frame. The frame 52 includes an upper frame 521, a middle frame 522, and a lower frame 523 from the upper left and right sides, and is connected to the rear frame 524 at the rear. Reference numeral 526 denotes a handle. The upper frame 521, the middle frame 522, and the lower frame 523 are formed by connecting the middle frame 522 and the lower frame 523 with a portion in which the upper frame 521 is bent and extends downward in front of the three frames. Yes. Further, a caster wheel, which is a front wheel, is fixed to the tip of the upper frame 521 so as to be rotatable about a vertical rotation shaft. The front end of the middle frame 522 is bent obliquely downward before the bent portion of the upper frame 521 and extends downward, and is joined to the front end of the lower frame 523.

  525 is an X frame A provided at the front of the vehicle body, and 526 is an X frame B provided at the rear of the vehicle body. The lower ends of the X frame A 525 and the X frame B 526 are fixed so as to be swingable around the central axis in the longitudinal direction of the left and right lower frames 523, and the X frame A 525 and the X frame B 526 are intermediate each other. Are connected by joint pins having a swing axis in the front-rear direction of the vehicle body. Reference numeral 527 denotes a connecting bar. The connecting bar 527 connects the upper ends of the X frame A 525 and the X frame B 526 along the left and right middle frames 522. Reference numeral 528 denotes a support member. The support member 528 is attached to the left and right middle frames 522 in a direction toward the inside of the wheelchair, and contributes to ensuring the rigidity of the wheelchair that can be folded by supporting the front and rear ends of the connecting bar 527 when the wheelchair is deployed. is doing.

  Reference numeral 531 denotes a support bracket. The support bracket 531 is fixed to the rear frame 524 between the middle frame 522 and the lower frame 523. An axle shaft (not shown) is fixed at an acute angle with a predetermined angle toward the upper side in the vertical direction of the support bracket 531 at a right angle or upward. Reference numeral 529 denotes a seat. The seat portion 529 is made of canvas and is provided so as to cover the left and right middle frames from the upper surface, and supports the weight of the passenger sitting on the upper surface. Accordingly, the height of the seat portion is clearly changed between when the occupant is seated and when the occupant is seated.

Reference numeral 53 denotes a drive wheel. In the drive wheel 53, reference numeral 532 denotes a hub. The hub 532 is fixed to be rotatable about a central axis in the longitudinal direction of the axle. 533 is a spoke, 534 is a rim, and 535 is a tire. Reference numeral 536 denotes a tire tread. The tire tread 536 is engraved with a pattern to grip the road surface and prevent slipping. The tire 535 and the rim 534 are assembled together, and air is filled in a cavity formed by the tire 535 and the rim 534. The spokes 533 are arranged at equal intervals between the hub 532 and the rim 534, and are connected to each spoke 533 with equal tension so that the rim 534 does not run sideways and rotates about the axle 531. ing. Thus, the load from the spokes 533 is transmitted to the rim 534, and the impact from the road surface is mitigated together with the tire 535.
In the drawing, the spoke 533 and the stay 537 are partially omitted. In a wheelchair that does not require folding, the X frame A 525, the X frame B 526, the connecting bar 527, and the support member 528 are not required.

  Referring also to FIG. 11, reference numeral 54 denotes a brake device used by the passenger. In the brake device 54, 541 is a bracket. The bracket 541 is fixed to the lower part of the upper frame 521 and the middle frame 522 of the left and right frames 52 at its front end and upper end. Reference numeral 542 denotes an adjustment slot, and 543 denotes a sub bracket. The adjustment long hole 542 is opened in the bracket 541, and is used to attach the sub bracket 543 with bolts and nuts (not shown) so that an interval between a brake shoe 557 and a tire 535 described later can be adjusted.

  Reference numeral 55 denotes a brake link mechanism. In the link mechanism 55, 551 is a lever. The lever 551 is fixed so as to be swingable in the front-rear direction of the vehicle body around a swing shaft 552 provided at a lower portion of the sub bracket 543. Reference numeral 553 is a grip. The grip 553 is fixed to the upper end of the lever 551. The other end of the lever 551 extends rearward slightly above the vehicle body at the portion of the swing shaft 552.

  Reference numeral 555 denotes a brake lever. The brake lever 555 has an L shape, and is fixed to a swing shaft 556 provided near the upper end of the brake lever 555 perpendicularly to the sub bracket 543 so as to be swingable about the swing shaft 556. The lower end 557 of the brake lever 555 is a brake shoe. The brake shoe 557 is bent substantially at a right angle and is substantially perpendicular to the sub bracket 543. Reference numeral 558 denotes a tire contact surface of the brake shoe.

  Reference numeral 560 denotes an intermediate link. The intermediate link 560 is connected to the other end extending rearward on the lower end side of the lever 551 and one end of the intermediate link 560 so as to be swingable by a pin joint 562. The pin joint 561 is swingably connected around the central axis. The pin joint 562 with the other end of the lower portion of the intermediate link 560 is located above the swing shaft 552, and the pin joint 561 with the brake lever 555 is disposed below the swing shaft 552. Has been. Reference numeral 563 denotes a stopper provided at the tip of the other end of the lever 551. The stopper 563 comes into contact with the intermediate link 560 and the lever 551 does not move further to the rear of the vehicle body.

  Since the conventional brake is configured as described above, in FIG. 11, when the occupant pulls the grip 553 forward and tilts it, the lever 551 rotates counterclockwise and the brake lever 555 is swung via the intermediate link 560. The brake shoe 557 is rotated clockwise about the shaft 556 to press the brake shoe 557 portion against the tread 536 of the tire 535. At this time, the swing shaft A552, the pin joint A561, and the pin joint B562 are stopped at positions that are substantially in a straight line. Reference numeral 563 denotes a stopper, which abuts against the intermediate link 560 and prevents the lever 551 from rotating further to the left. Further, the braking position is maintained by a so-called toggle effect that does not return to the release position due to the reaction force from the tire. When the grip 553 is returned to the original position, the link system of the brake device is released in reverse to the above description, and is held at the initial position. Reference numeral 544 is a guard wire. The guard wire 544 is provided for the purpose of securing the operating range of the lever 551 in the past, but this time it is also used as a stopper for holding the lever 551 in the brake release position.

  The longitudinal brake device 54 operates in this manner, and has sufficient strength and rigidity to hold the wheelchair in a stationary state. The inventor pays attention to this point and makes full use of the conventional brake device, so that the minimum necessary simple parts can be installed with the minimum amount of additional work, preventing the wheelchair from retreating when the occupant stands up. It is an attempt to provide a braking device.

  A first means of the present invention corresponds to claim 1, and includes a pair of rear wheels of a pneumatic tire provided with a hand rim, a brake device that can be braked and released by an operation of the passenger, and a passenger seat. In each wheelchair, the middle frame portion has a swing shaft, and one end of the wheel contacts the vertical movement of the lower surface of the seat portion. Opposite to the tread surface, the swinging shaft is provided so as to be swingable around the swinging shaft, and the other end of the L-shaped lever having one end fixed to the swinging member is opposed to the other end of the swinging lever. A link system in which the other end of the lever and the other end of the L-shaped lever are connected by a link rod is urged by a resilient force so that one end of the swing lever is always in contact with the lower surface of the seat portion, When the brake device operated by the occupant is in a brake-released state, the seat portion When the occupant is seated, the rocker is held at a position away from the tread of the tire via the link system, and when the occupant leaves the seat, the link system is used to A part of the tire contact surface of the rocker comes into contact with the tire tread surface with a predetermined load so that the wheelchair is completely braked in the reverse direction by a slight retreat of the wheelchair.

  According to the first means of the present invention, since the conventional brake device held in the released state of the brake is fully utilized, the additional parts directly related to the braking force of the brake device according to the present invention are When the occupant moves away from the seat and the seat moves upward, the other parts are guided to a position where a part of the tire contact surface of the oscillator contacts the tire of the drive wheel. Each member is lightweight and inexpensive because it adds a link system that gives frictional force to bite the retreating wheel and holds the oscillator away from the drive wheel when the occupant sits down. As shown in FIGS. 1 to 5, the mounting is simple. Therefore, it can be installed in a narrow wheelchair space while avoiding the original structural members of the wheelchair and can be easily mounted by additional work. In addition, there are many effects that there is no problem even when the wheelchair is folded.

  The second means of the present invention corresponds to claim 2 and, in addition to the first means of the present invention, the swinging element on the tire contact surface side of the swinging element immediately before contacting the tread surface of the tire. The flat plate is fixed so as to contact the tread surface of the tire.

  The third means of the present invention corresponds to claim 3, and in addition to the second means of the present invention, the flat plate is a metal plate or resin plate having a thickness of 1 mm or more.

  According to the second and third means of the present invention, the initial frictional force required for the rocker to bite into the tire can be remarkably reduced, so that the elastic force applied to the link system can be reduced. This also has the effect of further reducing the reverse distance, and the flat plate gives the frictional force necessary for the rocker to bite into the tire. Therefore, if the rocker bites into the tire, the role is finished and there is no problem even if it is separated from the tread surface of the tire. That is, the flat plate has the effect of reducing the load of the link system and strongly suppressing the backward movement of the tire.

The following is a list of the effects of the brakes that suppress the reverse at the start of the present invention.
1. By using a conventional brake device for the part where the braking force is applied, it is inexpensive by adding the smallest parts. And it can be installed with simple additional work.
2. Because of the simple and small number of parts, it is possible to arrange a link system that does not interfere with the folding of the wheelchair.
3. Since the oscillator is in surface contact with the tire surface, the tire surface is hardly damaged.
4). The flat plate is intended to assist in biting into the tire tread surface of the rocker and is less likely to damage the tire tread surface, thereby significantly improving the bite of the rocker into the tire.

  A first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view of the right side of the standard brake device of the wheelchair 51 of FIG. 10 with the link system of the brake device according to the present invention viewed from the inside of the wheelchair 51. Indicates the state. FIG. 2 is a perspective view showing a state where the passenger stands up in FIG. 3 to 5 are right side views of the wheelchair 51 of FIG. 10, and FIG. 3 is a view corresponding to FIG. 4 and 5 are right side views corresponding to FIG. In addition, the same code | symbol is attached | subjected to the part demonstrated in the prior art, and description is abbreviate | omitted.

  In FIG. 1, reference numeral 10 denotes a link system of a brake device according to the present invention. In the link system 10, reference numeral 100 denotes a swing lever, and 101 denotes a swing shaft. The swing shaft 101 is fixed to the support member 528 so as to be perpendicular to the longitudinal central axis of the middle frame 522 and to be horizontal toward the central direction of the wheelchair 51. The oscillating lever 100 is slidably fixed with respect to the central axis in the longitudinal direction. It is desirable that the upper end side of the swing lever 100 be bent and adjusted to the center side between the left and right middle frames 522 so that the amount of vertical movement of the seat portion 529 can be transmitted to the lower end side as an appropriate value.

  Reference numeral 103 denotes an L-shaped lever. The upper end of the L-shaped lever is disposed so as to face the lower end of the swing lever 100. Reference numeral 104 denotes a link rod. The link rod 104 connects the lower end of the swing lever 100 and the upper end of the L-shaped lever 103. Reference numeral 105 denotes a swirl line, and reference numeral 106 denotes an attachment member. The mounting member 106 is fixed using the adjustment long hole 542 of the bracket 541. The cigarette ridge 105 is stretched between the upper end of the L-shaped lever 103 and the mounting member 106. The cigarette ridge 105 applies an elastic force in a direction in which the L-shaped lever 103 is pulled, and urges the upper end of the swing lever 100 to always follow the movement of the seat portion 529 via the link rod 104.

In FIG. 3, reference numeral 108 denotes a rocker, and 109 denotes a tire contact surface of the rocker 108.
11 is a hinge. The hinge 11 has an upper wing 110 and a lower wing 111 fixed to a swing shaft 112 so that the upper wing 110 and the lower wing 111 can be opened and closed. The hinge 11 is fixed to the lower surface of the brake shoe 557 by the upper wing 110 with the swing shaft 112 along the opposite side of the tire contact surface 558. On the lower surface of the lower wing 111, the rocker 108 is disposed so as to be convex with respect to the tire tread surface 536 with the tire contact surface 109 on the upper side, and then the lower end of the L-shaped lever 103 is the rocker. It overlaps under the moving element 108 and is fastened together. The rocking element 108 has a quadric surface that decreases its curvature as it moves away from the rocking shaft 112 of the hinge 11. In order to explain this relationship, each of the concentric circles with the tire contact surface 109 of the rocker 108 is formed by drawing concentric circles at regular intervals from the circle in contact with the tread surface 536 of the tire 535 centered on the rocking shaft 112 of the hinge 11. The positional relationship where the intersection point contacts the tread surface of the tire is displayed.

  In FIG. 1, the positional relationship between the link system 10 of the brake device of the present invention and the X frame A 525 and the X frame B 526 is such that the X frame B 526, the swing lever 100, and the link rod 104 are moved forward from the rear of the wheelchair 51. The connecting portion at the lower end of the swing lever 100, the connecting portion at the upper end of the L-shaped lever 103 of the X frame A 525, the link rod 104, the L-shaped lever 103, the swoop ridge 105, and the mounting member 106 When folded, the X frame A 525 and the link rod 104 are in a position where they overlap, but the link rod 104 is thin and can be arranged to easily avoid interference, so that it does not hinder folding.

FIG. 2 shows the state of the link system 10 when the rider removes the load of the rising seat 529.
That is, the seat portion 529 returns upward. The upper end of the swing lever 100 is rotated counterclockwise around the swing shaft 101 by the elastic force of the swoop ridge 105, follows this, and further pushes back the seat portion 529. As shown in FIG. 4, the amount is in contact with the tire tread surface facing the tire contact surface 109 of the rocker 108 fastened together with the lower wing 111 of the hinge 11 of the L-shaped lever 103 via the link rod 104. It is the amount until. The tire abutment surface 109 of the rocker is given a frictional force that causes the rocker 108 to bite into the tire tread 536 of the wheelchair 51 by the elastic force of the ridge 105. In this state, when the wheelchair moves backward by only 2 to 3 cm, the rocker 108 bites into the tire 535 as shown in FIG.
In addition, it is preferable that the tire contact surface 109 of the rocker is provided with irregularities on the surface to improve the biting into the tire tread surface 536.

  In FIG. 5, the oscillator 108 receives a reaction force corresponding to the amount of deformation of the tire 535. This reaction force acts to rotate the lever 551 counterclockwise about the swing shaft 552 via the hinge 11 through the brake shoe 557, the brake lever 555, and the intermediate link 560. However, since the lever 551 is supported in contact with the wheelchair tip side of the guard wire 544, the oscillator 108 is maintained at that position against the reaction force from the tire 535. That is, the backward movement of the wheelchair is held in a restrained state.

  In order to cancel the reverse restraining state, if the wheelchair is moved slightly in the forward direction, the oscillator 108 returns to the state shown in FIG. 4 and can move without any trouble in the forward direction. However, if the wheelchair is moved slightly in the backward direction, the state shown in FIG. 5 is reproduced. When the passenger sits on the seat portion 529 again, the brake device is released as shown in FIG. 3 as described above.

In the brake device according to the present invention, as described above, the only strength members necessary for preventing the wheelchair from moving backward are the swinging element 108 and the hinge 11, and the other components utilize the existing braking device. Since the link system 10 withstands the signal function for transmitting the vertical movement of the seat portion 529 to the oscillator 108 depending on whether or not the passenger is sitting on the seat portion 529 and the resilience of the swirl ridge 105, as a whole It was possible to construct with cheap and simple parts. This produces an effect that the wheelchair in use can be attached with a simple additional work.
In the case of a foldable wheelchair, even if the brake device according to the present invention is mounted, the folding is not affected.
In order to demonstrate the wheelchair retraction prevention function according to the present invention, the wheelchair needs to move back 2 to 3 cm, but it is practically negligible from the viewpoint of preventing accidents caused by wheelchair retreat. It is a value that does not feel the wheelchair retreating even if it is used as a trial.

In the present embodiment, the brake device on the right side of the wheelchair 51 has been described. However, the brake device has a similar link system on the left side, and a rocker is attached to the left side conventional brake so that the left and right brakes operate properly. To do.
As for FIG. 6, the brake lever 555 moves in the direction of the tire tread 535 with the L-shaped lever 103 placed by operating the conventional brake device whether the passenger is sitting in the wheelchair or not. Therefore, since the oscillator 108 moves with the oscillator 108 placed, the oscillator 108 does not contact the tread surface 535 of the tire.

  In the second embodiment of the present invention, a flat plate is added to the rocker 108 in order to improve the biting of the rocker 108 to the tire, and the link system 10 is the description of the first embodiment of the present invention. Including FIG. 1 and FIG. Accordingly, the changed part of the oscillator will be described with reference to FIGS. In these drawings, the same reference numerals are given to the portions described in the first embodiment of the present invention, and the description thereof will be omitted.

7 to 9 are right side views of the wheelchair 51 of FIG. 10, and FIG. 7 is a view corresponding to FIG. 8 and 9 are right side views corresponding to FIG. In addition, the same code | symbol is attached | subjected to the part demonstrated in the prior art, and description is abbreviate | omitted.
FIG. 7 is a view in which a flat plate 107 is attached to the oscillator 108 of FIG. FIG. 8 is a view in which a flat plate 107 is attached to the oscillator 108 of FIG. FIG. 9 shows a state in which the tire has moved backward, and the flat plate 107 and the rocker 108 have bitten into the tire to prevent the tire from moving backward.

  In FIG. 7, reference numeral 107 denotes a flat plate. The flat plate 107 is used for the purpose of assisting the rocker 108 to bite into the tire. The plate thickness is effectively 1 mm or more in the case of a metal plate, and if a thick metal plate is used, it is effective to take a surface so that the thickness of the contact portion with the tire is about 1.5 mm. In the case of a resin material, it is preferable to increase the plate thickness in order to ensure rigidity. If the thickness of the contact portion with the tire is about 1.5 mm, the rocker can improve the biting of the tire.

  The flat plate 107 is mounted on the rocker 108 so as to overlap the rocker 108 on the tire contact surface 109 side. The positional relationship of attachment between the rocker 108 and the flat plate 107 is adjusted so that the rocker 108 and the flat plate 107 come into contact with the tread surface 536 of the tire 535 first because the passenger stands up in FIG. The adjustment allowance is preferably 1 mm to 5 mm.

  When the wheelchair is slightly retracted in the state of FIG. 8, the rocker 108 bites into the tire as shown in FIG. However, although the flat plate 107 is not separated from the tread surface of the tire, the purpose of using the flat plate 107 is to improve the biting of the rocker 108. Therefore, the flat plate 107 is prevented from biting into the tire tread surface 536 of the rocker 108. It is preferable that biting into the tire tread 536 is minimal.

    According to the second embodiment of the present invention, the bite of the rocker on the tire tread is remarkably improved, the resilience of the swirl 105 can be reduced, and the wheelchair moves backward without feeling that the wheelchair almost returns. It has the effect of being deterred. In addition, there is an effect that there is little risk of damage to the tire tread surface by using the flat plate 107 as long as the rocking element 108 is in a range of improvement in biting into the tire tread surface 536.

  The present invention has been described in detail in the embodiments, but the present invention is not limited to this, and it is needless to say that changes can be made within the scope of the utility model registration request.

1. Since the conventional brake device is fully utilized, the additional parts of the brake device according to the present invention are only simple parts with few strength members and can be easily installed by additional work.
2. For the reason described in item 1, the number of parts to be processed is small, the part price is low, and the processing cost is low.
3. Remodeling costs are also low.
4). The market is large as demand for new wheelchairs and used wheelchairs can be expected.

  It is the perspective view which looked at the right side surface of the wheelchair which shows the state of the link system in which a passenger is seated from the inner side.   It is the perspective view which looked at the right side surface of the wheelchair which shows the state of the link system when a passenger stood up from the inner side.   It is a right view which shows the positional relationship of a tire and a rocker | operator at the time of the state of the link system shown in FIG.   FIG. 3 is a right side view showing a state in which the rocker is in contact with the tire in the state of the link system shown in FIG. 2.   FIG. 5 is a right side view showing a state in which the tire is retracted by a small amount and the wheel is locked in the state of FIG. 4.   It is a right view which shows that a manual brake operation is not obstructed when a manual brake is applied.   It is a right view which shows the state of the oscillator which attached the flat plate.   It is a right view which shows the state which contact | abutted to the tire when the passenger | crew who stood up the rocker which attached the flat plate stood up.   FIG. 9 is a right side view showing a state in which the rocker attached with the flat plate continues to FIG. 8 to lock the wheel by retreating the wheelchair.   1 is an overall perspective view of a wheelchair equipped with a vertical standard manual brake device.   FIG. 11 is an enlarged perspective view of a brake portion in FIG. 10.

DESCRIPTION OF SYMBOLS 10 Link system 100 Swing lever 101 112 552 556 Swing axis 103 L-shaped lever 104 Link rod 105 Wound ridge 106 Attachment member 107 Flat plate 108 Swing element 109 Tire contact surface 11 of swinging part 110 Upper wing 111 Below Side wing 51 Wheelchair 52 Frame 521 Upper frame 522 Middle frame 523 Lower frame 524 Rear frame 525 X frame A
526 X frame B
527 Connecting bar 528 Support member 529 Seat portion 53 Drive wheel 531 Support bracket 532 Hub 533 Spoke 534 Rim 535 Tire 536 Tire tread 54 Brackets 541 Bracket 542 Adjusting long hole 543 Sub bracket 544 Guard wire 55 Manual brake device 551 Lever 553 Grip 555 Brake lever 557 Brake shoe 558 Tire contact surface 560 of brake shoe Intermediate link 562 561
563 Stopper 552 Swing axis A
561 Pin Joint A
562 Pin joint B

Claims (3)

A wheelchair equipped with a pair of rear wheels of a pneumatic tire with a hand rim, a brake device that can be braked and released by operation of the passenger, and a seat for the passenger, and has a swing shaft in the middle frame part One end is swingable around the swinging shaft with the swinging lever and the brake shoe following the vertical movement of the seat part through the swinging shaft with the tire contact surface of the rocker facing the tread surface of the tire. The other end of the L-shaped lever, one end of which is fixed to the rocker, is opposed to the other end of the rocking lever, and the other end of the rocking lever and the other end of the L-shaped lever are linked. In a link system configured by connecting with a rod, one end of the swing lever is always urged by a resilient force so as to contact the lower surface of the seat portion, and the brake device operated by the occupant is in a state of releasing the brake, When the passenger is seated in the seat, the rear When the oscillating element is held at a position away from the tread surface of the tire via a hook system and the occupant leaves the seat, a part of the tire contact surface of the oscillating element via the link system The wheelchair brake device, wherein the wheelchair is brought into contact with the tire tread with a predetermined load, and the wheelchair is completely braked in the reverse direction by a slight retreat of the wheelchair. The wheelchair brake device according to claim 1, wherein a flat plate is fixed to a tire contact surface side of the rocker so that the rocker contacts the tread surface of the tire immediately before contacting the tire tread surface. The brake device according to claim 2, wherein the flat plate is a metal plate or a resin plate having a thickness of 1 mm or more.

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