JP3148159U - Brake device for wheelchair one-handed operation - Google Patents

Abstract

A brake device for left and right tires that obtains braking force by pressing the surface of a pneumatic tire of a wheelchair with a brake shoe is provided that can be operated with one hand by adding inexpensive parts. In connecting each brake shoe 557 of the brake device 54 on the operation side and the operated side with the wire cable 10 or the like, the outer cable 110 or the like at one end of the wire cable is fixed to the brake lever 555 on the operation side, The inner cable 111 or the like is fixed to the front vehicle body. The outer cable at the other end of the wire cable is fixed to the vehicle body behind the operated brake device, and the inner cable is fixed to the brake lever. An inner cable is arrange | positioned so that the center axis | shaft of the longitudinal direction of this outer cable may be followed as much as possible. The lever and intermediate link of the operated brake device are removed, and a return spring is provided in a direction to apply tension to the wire cable to the brake lever. The outer cable is caught on the vehicle body to allow deformation that occurs during operation. [Selection] Figure 1

Description

  The present invention provides a left and right independent brake device that obtains braking force by pressing the surface of a pneumatic tire of a wheelchair with a brake shoe, and by operating one of the left and right brake devices by adding inexpensive parts. A brake device capable of operating and releasing the other brake in conjunction with each other is provided.

Detailed description of the invention

  A brake device used for a wheelchair includes a pneumatic tire for each of a pair of drive wheels fixed to be rotatable about an axle fixed to both sides of the frame so as to protrude in a direction substantially perpendicular to the frame. A brake shoe is pressed on the outer periphery in a direction toward the axle. The brake devices are independent left and right devices, and each of the brake devices is operated to release and operate a brake by a link mechanism connected to the brake shoe from a lever fixed to the bracket so as to be swingable about a swing shaft. Things are commonly used.

  In the case of a wheelchair user who has a disability in the left or right hand, it is extremely inconvenient to operate the left and right levers with one hand.

As a countermeasure against this, in Patent Document 1, two flexible protective tubes through which wires, strings, belts or chains connecting the operating levers of the right and left brake devices are connected are fixed to the chair frame and the wires, strings, belts are used. Alternatively, both ends of the chain are connected to the opposing position of the operation lever so that when either the left or right lever is pushed and pulled, the other lever is also pushed and pulled so that the brake is applied simultaneously on the left and right.
In Patent Document 2, one end of a wire is connected to the operating posture side of either the left or right operating lever, the other end of the wire is connected to the releasing posture side of the other operating lever, and further biased to the releasing posture side. A return spring is provided between the main body frame.

Japanese Patent No. 40929218 Refer to Claim 1 and FIG. Utility model registration No. 3116062 Claim 1, see FIG.

  According to Patent Document 1, two cables bent in a U-shape are required and the resistance is large. In Patent Document 2, the number of cables is one, but it is bent into an S shape, and the resistance of the cables is increased as in the case of using the two cables.

  Since the left and right independent brake devices are connected to each other, the operating force is increased by a factor of about 2. Further, since the cable is mounted in at least a semicircular arc, the resistance of the cable is also added. Although it is preferable to minimize the operating force and the left and right brakes exert substantially the same braking force, generally wire cables are elastically deformed to some extent. In general wire cable usage, a large amount of movement on the operating side is provided to ensure the necessary amount of movement on the operated side. In the use of the wire cable in the present invention, the movement of the cable at one end is reduced at least by the elastic deformation at the other end. For example, when trying to stop by braking on a slope, if there is a difference between the left and right braking force, there is no risk that the wheel with insufficient braking force will turn the vehicle body around the wheel with normal braking force. do not do. Therefore, it is necessary to consider that the braking force is substantially equal. Here, “substantially the same braking force” means a state in which a wheelchair does not cause a problem such as turning due to the difference between the above-mentioned operation-side and operated-side bokeh forces. .

  An example of a commercially available wheelchair equipped with a brake device that is the subject of the present invention will be described with reference to FIGS. FIG. 9 is an overall left perspective view of a wheelchair equipped with a standard brake device. FIG. 10 is an enlarged perspective view of the brake portion of FIG. In FIG. 9, 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 525 at the rear thereof. Reference numeral 526 denotes a handle. Further, the upper frame 521, the middle frame 522, and the lower frame 523 have a portion in which the upper frame 521 bends and extends downward in front of the middle frame 522 and the lower frame 523. Yes. Further, a caster wheel 524 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 middle frame 522 is connected to the middle frame 522 and the lower frame 523 at the tip of the middle frame 522 by bending the upper frame 521 and extending downward. Further, a caster wheel 524 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. A footrest 527 is fixed to the tip of the middle frame 522 so as to be swingable about the swing shaft.

  Reference numeral 528 denotes a support bracket. The upper and lower ends of the support bracket 528 are fixed to the middle frame 522 and the lower frame 523 near the rear frame 525. The axle 531 is fixed at an acute angle having a predetermined angle toward the right or upward at the outer side of the vertical center portion of the support bracket 528.

Reference numeral 53 denotes a drive wheel. In the drive wheel 53, reference numeral 532 denotes a hub. The hub 532 is fixed so as to be rotatable about the central axis in the longitudinal direction of the axle 531. 533 is a spoke, 534 is a rim, and 535 is a tire. The tire 535 and the rim 534 are assembled together, and a cavity formed by the tire 535 and the rim 534 is filled with air. The spoke 533 connects the hub 532 and the rim 534 so that the rim 534 does not run sideways and rotates around the axle 531. 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 tires 535. Reference numeral 536 denotes a hand rim. The hand rim 536 has an annular shape whose diameter is slightly smaller than that of the rim 534, and is fixed to the rim 534 at four or five places by a stay 537 so that the center thereof coincides with the central axis of the hub 532.
A wheelchair passenger travels by driving the hand rim 536.

  Referring also to FIG. 10, reference numeral 54 denotes a brake device. In the brake device 54, 541 is a bracket. The bracket 541 is fixed to the lower part of the front end of the upper frame 521 of the left and right frames 52 and to the middle frame 522 with its front end and center part. Reference numeral 542 denotes an adjustment hole. The adjustment hole 542 is a long hole extending in the horizontal direction, and is provided in the horizontal direction above the bracket 541. Reference numeral 543 denotes a sub bracket. A stud bolt 544 is provided on the back surface of the sub bracket 543 with reference to FIG. 2 so as to be inserted into the adjustment hole 542, and the sub bracket 543 is within the range of the adjustment hole 542 with respect to the bracket 541. And fixed by a nut 545 so that the position can be adjusted in the front-rear direction.

  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 with a screw (not shown). The other end of the lever 551 extends in the rearward direction of the vehicle body and the upside direction at the portion of the swing shaft 552.

  Reference numeral 555 denotes a brake lever. The brake lever 555 has an L shape, and its upper end is fixed so as to be swingable about a swing shaft 556 provided perpendicular to the sub bracket 543. 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 557.

  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, and the other end is connected to a substantially central portion of the brake lever 555 and the pin joint 561. The pin joint 562 is swingably connected around the central axis. The position of the pin joint 562 with the other end of the lower portion of the lever 551 of the intermediate link 560 is above the swing shaft 552, and the pin joint 561 with the brake lever 555 is below the swing shaft 552. Has been placed. Reference numeral 563 denotes a stopper.

  Since the vertical brake is configured as described above, when the rider pulls the grip 553 forward, the lever 551 rotates counterclockwise and the brake lever 555 is centered on the swing shaft 556 via the intermediate link 560. When the brake shoe 557 is pushed in the direction of the tire 535 and further proceeds against the reaction force of the tire 535, the pin joint 562 passes through a straight line connecting the swing shaft 552 and the pin joint 561. To do. The time of passing is a full stroke with respect to the tire, and the reaction force from the tire is maximized. When the grip 553 is further advanced beyond this point, the grip 553 receives a thrust force in the further moving direction due to the reaction force of the tire. In this state, the stopper 563 constitutes a toggle function that abuts against the intermediate link 560 and prevents the lever 551 from further rotating counterclockwise. That is, the toggle mechanism necessary for maintaining the brake state is not necessary on the operated side in order to solve this problem.

  Since vertical brake devices operate in this way, for passengers with a disability in one hand, operate and release the brake by sequentially operating the left and right operation levers of the wheelchair with another healthy hand. It is necessary and very inconvenient.

  The problem to be solved by the present invention is that inexpensive parts can be easily installed by additional machining, the left and right independent brake devices are connected, the operating force is still as small as possible, and there is a substantial difference between the left and right braking forces. In addition, the present invention provides a brake device for one-handed operation of a vehicle lever that does not interfere with the raising and lowering of the wheelchair and that can be folded.

  A first means of the present invention corresponds to claim 1, and a brake mechanism for pressing and releasing a brake shoe on the outer periphery of the pneumatic tire of the drive wheel is provided on each of the left and right drive wheels, and the left and right brake levers are provided. It is connected with a wire cable, operates the operation lever on the operation side of the brake mechanism to press and release the brake shoe, and presses and releases the brake shoe of the operated brake mechanism, The outer cable at one end of the wire cable is connected to the brake lever on the operating side, the inner cable at one end is fixed to the frame in front of the brake device on the extension line of the outer cable at one end, and the other end of the inner cable is connected Fix the brake lever on the operated side, fix the other end of the outer cable to the frame behind the brake device along the other end of the inner cable, The power spring for urging the other brake lever to the release side is provided, and substantially equal braking force of the operation side and the operated-side, and further to remove the operating linkage of the operated side.

  The second means of the present invention corresponds to claim 2 and, in addition to the first means of the present invention, using the wire cable having a capacity sufficiently larger than the brake operation force applied to the wire, the operation side and the operated object The amount of movement of the brake shoe on the side is made substantially equal to equalize the braking force of the left and right brakes.

  The third means of the present invention corresponds to claim 3, and in addition to the first means of the present invention, the mounting position of the wire cable to the brake lever is determined according to the load-bearing capacity of the wire cable. The distance from the moving center is set so that the operating side and the operated side have different positions, and the braking forces on the operating side and the operated side are made substantially equal.

The fourth means of the present invention corresponds to claim 4, and in addition to the third means of the present invention, the brake lever is extended to use a wire cable having a smaller load resistance.

  The fifth means of the present invention corresponds to claim 5 and includes, in addition to the first means of the present invention, a surface that presses the tread surface of the pneumatic tire of the drive wheel in the axial direction of the tire, and the pressing surface. The brake pieces having surfaces on both sides for suppressing the portion of the tire that deforms in the width direction are fixed so as to operate integrally with at least the brake shoe on the operation side, and the brake force on the operation side and the operated side is substantially increased. Is equally adjusted.

  The sixth means of the present invention corresponds to claim 6, and, in addition to the first means of the present invention, includes a surface that presses the tread surface of the pneumatic tire of the drive wheel in the axial direction of the tire and the pressing surface. Brake pieces having both sides of the tire that suppress the deformation of the tire in the width direction are mounted on both the operating side and the operated side braking device, so that the brake force is reduced less even if the tire air pressure decreases. is doing.

  According to the first means of the present invention, it is possible to use one cable by bending it into a U-shape, and the movement of the brake shoe on the operating side and the movement of the brake shoe on the operated side with respect to the drive wheel are controlled. Can be in the same direction. Therefore, the resistance of the wire cable is halved compared with the case where the two cables in the embodiment of the prior application are used for cutting or bent into an S shape. Also, the load peak can be reduced by removing the toggle mechanism on the operated side. Further, since the braking force on the operating side and the operated side are made substantially equal, problems such as turning of a wheelchair caused by insufficient braking force on the operated side can be prevented.

  According to the second means of the present invention, a wire cable having a capacity that is sufficiently larger than the brake operating force applied to the wire due to the difference in brake force between the operating side and the operated side in the first means of the present invention is used. As a result, the elastic deformation of the wire cable is minimized, and the movement amounts of the brake shoes on the operating side and the operated side are made substantially equal, and the braking force of the left and right brakes is made substantially equal.

  According to the third means of the present invention, the difference in braking force between the operating side and the operated side in the first means of the present invention is determined according to the load carrying capacity of the wire cable with respect to the brake lever. Insufficient movement of the cable on the operated side due to the elastic deformation that occurs, the distance from the swing center of the brake lever is shorter than the operating side, and the movement of the operating side and the operated brake shoes is reduced. The brake force is increased by making the distance from the swing center of the brake lever on the operated side longer than that on the operation side so that the brake return amount on the operated side is reduced to the practical limit. Are substantially equal, and the operation force is reduced.

  According to the fourth means of the present invention, in addition to the third means of the present invention, the length of the brake lever is extended, the load applied to the wire cable is reduced, and the wire cable having a smaller load resistance can be used. There is an effect. In other words, there is an abundance of products on the market, and it is possible to use an inexpensive sports-specific bicycle brake wire cable. Although the resistance decreases as the load decreases, the resistance of the wire cable in the operation lever does not change significantly because the length of the brake lever is extended.

  According to the fifth means of the present invention, an adjustment is made such that the brake force on the operated side is improved by mounting the brake piece on at least the brake shoe on the operated side so that the brake force is substantially equivalent to that on the operating side. There is an effect that the amount can be reduced.

  According to the sixth means of the present invention, even if the wheel pressure of the wheelchair is reduced, the brake force is hardly lowered and the brake force can be maintained even in a state close to a practical limit tire pressure.

The effects of the present invention are listed as follows.
1. By adding a small number of parts at low cost, it is possible to provide a one-handed brazier for a wheelchair with relatively light operating force.
2. The height of the grip shall be a height that does not hinder passengers from raising and lowering. If necessary, it is possible to reduce the operating force by using a swinging hook mechanism for gripping.
3. A structure that does not hinder the folding and deployment necessary for a wheelchair can be achieved.
4). There is a degree of freedom in selecting the type of wire cable that links the operating side and the operated side. In each case, the wire cable has a U-shaped arrangement with the least resistance, and multiple measures to make the braking force substantially equal Therefore, it is possible to make a relatively light one-handed brake device.
5. Even if the tire pressure is low, the scope of use has been expanded by presenting measures that reduce the braking force.

  A first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1A is a perspective view in which one end of a wire cable is attached to a standard brake device on the left side surface of a wheelchair according to the present invention, and is an operation side provided with an operation unit operated with one hand. FIG. 1 (b) is a perspective view in which the present invention is applied to a standard brake device on the right side surface of the wheelchair and the other end of the wire cable is mounted, which is the operated side. FIG. 2 is a left perspective view showing the main brake left and right parts and the wire cable mounting state to which the present invention is applied. FIG. 3 is a perspective view showing a grip incorporating a known swing rod mechanism instead of the grip 553. In addition, the same code | symbol is attached | subjected to the part demonstrated by the longitudinal technology, and description is abbreviate | omitted.

1A, 2 and 3, reference numeral 10 denotes a wire cable. The wire cable 10 has high rigidity close to only elastic deformation of steel in the longitudinal compression in which the outer periphery of a coiled tube in which a steel wire is tightly wound is covered with a resin, and is flexible in the direction perpendicular to the axis. It consists of a high cable outer 110 and a cable inner 111 formed by twisting thin steel wires that are movably inserted in the longitudinal direction thereof. A cable inner 111 at one end of the wire cable 10 is fixed to a portion extending downward of the upper frame 521 with a bolt 112 and a nut 115 using a clamp 112. Further, the cable outer 110 on the one end side of the wire cable 10 is fixed by a bolt 114 and a nut 115 in the vicinity of the brake shoe 557 of the brake lever 555 by a clamp 113 that wraps the end portion and the outer periphery thereof. The cable inner 111 at the one end is preferably fixed on the extended line of the central axis in the longitudinal direction of the end of the cable outer 110.
FIG. 3 shows a grip 118 used instead of the grip 553.

  1B and 2, the cable outer 110 on the other end side of the wire cable 10 is fixed to a bracket 117 a provided on the rear side of the brake device with a bolt 114 and a nut 115 using a clamp 113. Further, the cable inner 111 at the other end of the wire cable 10 is fixed to the brake lever 555 with bolts 114 and nuts 115. As described above, the cable inner 111 is fixed to the other end of the wire cable along the longitudinal central axis of the end portion of the cable outer, and the cable outer 110 is connected to the cable outer 110 from the swing shaft 556 of the brake lever 555 on the operation side. The distance from the swing shaft 556 of the brake lever 555 on the operated side to the center of the cable inner 111 at the other end is the loss of displacement transmission due to the elastic deformation of the wire cable. Install it in a position that is as short as possible. Further, a spring 116 urging the return side of the brake lever 555 was attached with a bolt 114, a nut 115 and a bracket 117b, and the lever 551, the grip 553, and the intermediate link 560 were removed from the brake device.

Next, the operation of the brake device according to the present invention will be described. The present invention is to provide a brake device that can be operated with one hand by adding inexpensive parts to existing wheelchairs with a simple additional work. It takes into consideration that it does not interfere with getting on and off, and that the operating force is as light as possible.
First, the brake device on the operation side and the operated side was connected by the wire cable 10 so that the wheelchair could be folded. Since the resistance of the wire cable 10 increases as the number of bends increases, one wire is bent in a U shape so that the resistance is minimized, and the brake levers 555 on the operation side and the operated side are connected to the drive wheels. As described above, the attachment method as described above was used so as to make the same movement. In this attachment method, first, the wire cable outer 110 is constricted due to elastic deformation because the other end of the wire cable outer 110 is constrained with the movement of the brake lever 555 on the operation side. The shape is deformed and the cable inner 111 on the operated side is pulled in according to the movement of the brake lever 555 on the operating side. The cable inner 111 is also drawn into the cable outer 110 with elastic extension due to the resistance of the brake lever 555 on the operated side.

  Therefore, the movement of the brake lever 555 on the operating side is subtracted by the substantially elastic deformation of the wire cable 10 due to the resistance of the brake lever 555 on the operated side, the spring force of the return spring 116, and the resistance of the wire cable. To the brake lever 555. Since the difference in the movement amount of the brake lever on the operation side and the operated side becomes a difference in brake force, the position of the cable outer 110 at one end of the wire cable 10 is attached to the brake lever for the purpose of correcting the difference in the movement amount. The distance from the swing shaft 556 of the operated brake lever 555 to the center of the cable inner 111 at the other end with respect to the distance from the swing shaft 556 of 555 to the central axis in the longitudinal direction of the cable outer 110 is the cable. The attachment was made as short as possible corresponding to the difference in the amount of movement accompanying the elongation of the wire.

    Since the operating force on the operating side operates the left and right brakes at the same time, including the resistance of the wire cable 10 connecting them, the operating force of the left and right independent brake devices exceeds approximately twice. As a measure for reducing the operating force, the lever 551 and the intermediate link 560 of the operated brake device are removed. As a result, the operation resistance due to the toggle mechanism on the operated side is eliminated, and the brake lever 555 is always biased to the return side by the reaction force of the tire. Therefore, the spring 116 that urges the brake lever 555 to the release side has a light load with a repulsive force necessary to pull back the wire cable inner after the brake shoe 557 of the brake lever leaves the tire, and the load is reduced as a whole. Was measured. The arm length from the swinging shaft 552 to the grip 553 is changed to a grip 118 having a built-in swinging mechanism 119, so that the arm length from the swinging shaft 552 exceeds 300 mm. The power can be halved. When the swing-out portion was stored, the length of the arm from the swinging shaft 552 was 150 mm, which was the same as the height of the top of the vertical grip, so as not to obstruct the passenger. Note that the height of the top of the vertical grip 553 is slightly lower than the upper frame 521.

  A second embodiment of the present invention will be described in detail with reference to FIGS. FIG. 4 is a left perspective view showing the mounting state of the main part of the left and right brakes and the wire cable to which the present invention is applied. FIG. 5 is also a left perspective view showing the mounting state of the main part of the left and right brake device to which the present invention is applied and the wire cable as in FIG. The only difference between FIG. 4 and FIG. 5 is that the attachment position of the cable from the swing shaft 556 of the brake lever 555 on the operating side and the operated side is reversed. In addition, about the part demonstrated in background art and the 1st example of implementation, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In FIG. 4, 20 is a brake wire cable for a commercially available bicycle for sports specification, and 123 is an extension plate. In the wire cable 20, an extension plate 123 is attached to the brake lever 555 with bolts 114 and nuts 115 in terms of load resistance to reduce the load applied to the wire cable 20. The wire cable 20 has the same configuration as that of the wire cable 10 but is composed of a cable outer 120 and a cable inner 121 that are slightly smaller in size because they are for light loads. A cable inner 121 at one end of the wire cable 20 is fixed to a portion extending downward of the upper frame 521 with a bolt 112 and a nut 115 using a clamp 112. Further, the cable outer 120 on the one end side of the wire cable 20 has an extension plate 123 fixed to the brake lever 555 with a bolt 114 and a nut 115 by a clamp 113 that wraps the end portion and the outer periphery thereof, and the bolt 114 on the extension plate. The nut 115 is fixed. The cable inner 121 at one end is preferably fixed on an extension line of the central axis in the longitudinal direction of the end portion of the cable outer 120.

  In FIG. 4, the cable outer 120 on the other end side of the wire cable 20 is fixed to a bracket 117 b provided on the rear side of the brake device with a bolt 114 and a nut 115 using a clamp 113. Further, the cable inner 121 at the other end of the wire cable 20 is fixed to the brake lever 555 by the extension plate 123 by the bolt 114 and the nut 115, and the bolt 114 and the nut 115 are fixed on the extension plate 123. As described above, the cable inner 121 is fixed to the extension of the central axis of the end portion of the cable outer 120 at the other end of the wire cable 20, and the cable outer 120 is connected from the swing shaft 556 of the brake lever 555 on the operation side. The distance from the swing shaft 556 of the brake lever 555 on the operated side to the center of the cable inner 121 at the other end with respect to the distance to the central axis in the longitudinal direction is the amount of loss of displacement transmission due to elastic deformation of the wire cable. Only install in a short position. Further, a spring 116 for biasing the return side of the lever 555 was mounted with a bolt 114, a nut 115 and a bracket 117a, and the lever 551, the grip 553, and the intermediate link 560 were removed from the brake device. In FIG. 4, the operating force is reduced by using a grip 118 used instead of the grip 553.

  The operation and effect of the second embodiment of the present invention will be described. In the second embodiment of the present invention, the configuration and the brake device of the wire cable, and the method of attaching the wire cable are the same as those of the first embodiment of the present invention, and therefore the operation and effect thereof are the same. However, since the point of using a commercially available sports specification auto transmission vehicle cable is different, the installation of the wire cable 20 and the effect thereof will be explained. Since this brake wire is on the market in large quantities, it is extremely You can purchase the required amount at low cost. However, since the load resistance is small, and the elastically deformed portion is large, it is necessary to add the extension plate 123 to the brake lever 555 to ensure sufficient displacement on both the operation side and the operated side. However, since the wire cable 20 is extremely cheap compared to other custom-made products, there is an effect that even if additional processing including the extension plate 123 is added, the wire cable 20 can be sufficiently priced.

A third embodiment of the present invention will be described in detail with reference to FIG. Since the third embodiment of the present invention has the same parts as the second embodiment of the present invention, the same reference numerals are given and description thereof is omitted. Differences will be described because the attachment positions of the operation side and the operated side of the wire cable 20 are different.
That is, with respect to the distance from the swinging shaft 556 of the brake lever 555 on the operating side to the central axis in the longitudinal direction of the cable outer 120, the cable inner 121 of the other end of the cable inner 121 from the swinging shaft 556 of the brake lever 555 on the operated side. The distance to the center is considered in consideration of correction of insufficient displacement transmission due to elastic deformation of the wire cable, and the stroke of the brake shoe 557 on the operated side is the minimum that the brake shoe 557 is practically separated from the tire from the brake operating position. I have decided so.

  According to the third embodiment of the present invention, the stroke of the brake shoe 557 on the operated side is almost halved with respect to the stroke of the brake shoe 557 of the brake lever 555 on the operating side, which is the swing shaft on the operating side. The distance from the operated swing shaft 556 to the center axis of the cable inner 121 on the extension plate 123 is about 2/3 with respect to the distance from the center axis of the cable outer 120 on the extension plate 123 to 556. There is an effect that the brake force on the operated side on the operating side is reduced.

A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view showing a main part of a brake on the right side surface of the wheelchair. FIG. 8 is a graph showing a braking force measurement method using a brake piece and its effect.
FIG. 6 shows a brake device on the operated side. In the brake device, reference numeral 130 denotes a brake piece. The brake piece 130 has a surface 131 that presses the tread surface of the tire 535 of the drive wheel and both sides of a deformation suppressing surface 132 in the lateral direction of the tire caused by the pressing. The brake piece 130 is fixed to the brake shoe 557 of the brake lever 555 with bolts 133 and nuts 134 so that the gaps between the tire deformation suppression surfaces 132 on both sides and the tire 535 are equal.

  FIG. 8 is a graph showing the braking moment due to tire pressure and air pressure when the brake piece 130 is attached to the brake device of the wheelchair and when the brake piece 130 is not provided. As shown in the lower part of Fig. 8, the measurement method is as follows. The brake is applied with the driving wheel floating, the spring balance is pulled in the P direction, the load on the spring balance when the tire starts to move, and the resistance moment is calculated. It is a graph. The broken line E indicates that there is no brake piece, and the broken line G indicates a measurement result when the tire pressing surface 131 of the brake piece 130 is mounted on the tire contact surface 558 of the brake shoe 557. Indicates an effect of 25% to 30% increase.

  As can be seen from the above description, this embodiment increases the braking force by attaching the brake piece 130 to the brake shoe 557 on the operated side, unlike the first to third embodiments of the present invention. . Accordingly, the operation-side break device corresponding to the present embodiment may be any of the first to third embodiments of the above-described device, and the operation side and the operated side in consideration of the increase of the braking force on the operated side. The attachment position of the wire cable with respect to each brake lever 555 is adjusted so that the braking force of the brakes is substantially equal.

Next, the operation and effect will be described.
In the brake mechanism that presses and releases the brake shoe 557 on the outer circumference of the pneumatic tire 535 of the drive wheel, the brake wheel 557 is substantially orthogonal to the extension line of the diameter of the pneumatic tire 535 of the drive wheel, and the outer circumference of the tire is A brake piece 130 having a surface that presses in the axle direction and a surface 132 that suppresses a portion in which the tire 535 is deformed in the width direction by the pressing surface 131 is fixed so as to operate integrally with the brake shoe 557. To prepare for.

  Since the tire restraining surface 132 of the brake piece 130 restrains the deformation of the tire from side to side even if the tire 535 is lowered and the tire is deformed to both sides due to the pressing force of the brake shoe 557 due to the pressing force of the brake shoe 557, the tire pressure is suppressed. In addition, the elastic force of the rubber of the tire itself contributes to an increase in the frictional force between the tire 557 and the brake piece 130. This frictional force increases as the contact area between the tire 557 and the brake piece 130 increases, so that the effect of reducing the reduction in braking force is achieved. Further, since the brake piece 130 is in surface contact with the surface of the tire 557, the tire surface is hardly damaged. However, the above-described effects can be achieved by simply remodeling a pair of brake shoes 557, which is currently used in many wheelchairs, with a single bolt fixing hole and additionally mounting an inexpensive brake piece 130.

A fifth embodiment of the present invention will be described in detail with reference to FIGS. FIG. 6 has been described in the fourth embodiment of the present invention. FIG. 7 is a perspective view showing a main part of a brake on the left side surface of the wheelchair. FIG. 7 shows a brake device on the operation side. In the brake device, reference numeral 130 denotes a brake piece. The mounting of the brake piece 130 on the operated side is as described with reference to FIG.
With respect to FIG. 8, the fifth embodiment of the present invention has already been described with respect to the method of using the brake piece 130 mounted on the operated brake device to increase the braking force. In this embodiment, an object of the present invention is to provide a one-hand operation brake device in which the braking force of the brake piece 130 is small even when the tire air pressure is reduced. The brake piece 130 is attached to both the operation side brake device and the operated side brake device.
According to the experience of wheelchair users, the tire pressure at the limit of use is about 0.09 MP because the lateral rigidity of the tire is lowered, the wheelchair is staggered, and the road surface vibration is directly picked up. From the measurement result of FIG. 8, the braking moment of one side wheel is about 50 N · m when the brake piece 130 is not attached, whereas it is about 90 N · m when the brake piece 130 is attached. There is an effect that the fear that the wheelchair to which the brake is applied when the occupant stands up and the occupant suffers an unexpected accident is reduced.

  The present invention is not limited to each example, and it goes without saying that changes can be made without departing from the scope of the utility model registration request.

There are many people who use wheelchairs who have difficulty with one hand, but I do not hear that wheelchairs equipped with brake devices that can operate the left and right brake devices with one hand are on the market. As mentioned above, this device
1. By adding a small number of parts at low cost, it is possible to modify the brake device for one-handed operation of a wheelchair with a relatively light operating force.
2. The height of the grip is a height that does not hinder the rider's ascending / descending, and the operating force can be reduced by using a swing lever mechanism as needed.
3. A structure that does not hinder the folding and deployment necessary for a wheelchair can be achieved.
4). The arrangement method of the wire cable for interlocking the operation side and the operated side is a U-shaped arrangement with the least resistance, and the brake force can be adjusted.
5. Even if the tire pressure is low, the scope of use has been expanded by presenting measures that reduce the braking force.
We are confident that many users will be able to use it with satisfaction.

(A) It is a perspective view of the operation side which attached the end of the wire cable to the standard brake device of the left side surface of a wheelchair by this invention. (B) It is a perspective view of the operated side which applied this invention to the standard brake device of the right side surface of a wheelchair, and equipped with the other end of the wire cable. It is a left perspective view which shows the attachment condition of the principal part of the right and left brakes and wire cable to which this invention is applied. It is a perspective view of the grip incorporating the mechanism of a well-known swinging rod. It is a left perspective view which shows the attachment condition of the principal part of the right and left brakes and wire cable to which this invention is applied. FIG. 5 is a left perspective view showing a main part of a left and right brake device to which the present invention is applied and a mounting state of a wire cable as in FIG. 4. It is a perspective view which shows the principal part of the brake of a wheelchair right side surface. It is a perspective view which shows the principal part of the brake of a wheelchair left side surface. It is a graph which shows the braking force measuring method using a brake piece, and its result. It is a left perspective whole view of a wheelchair provided with a brake device used for explanation of background art. FIG. 10 is an enlarged left perspective view of the brake portion of FIG. 9.

Explanation of symbols

10, 20 Wire cable assy
51 Wheelchair 52 Frame 53 Drive wheel 54 Brake device 55 Brake link mechanism 110, 120 Cable outer 111, 121 Cable inner 112, 113 Clamp 114, 133 Bolt 115, 134 Nut 116 Spring 117a, 117b Bracket 118, 553 Grasp 119 Mechanism 123 Extension plate 130 Brake piece 131 Tire pressing surface 132 Tire deformation suppressing surface 520 Sub frame 521 Upper frame 522 Middle frame 523 Lower frame 525 Rear frame 528 Support bracket 531 Axle 532 Hub 533 Spoke 534 Rim 535 Tire 536 Hand rim 541 Bracket 542 Adjustment Hole 543 Sub bracket 544 Stud bolt 545 Nut 551 Lever 552, 556 Swing Driving shaft 555 Brake lever 557 Brake shoe 558 Tire contact surface 560 Intermediate link 561, 562 Pin joint 563 Stopper E FIG. 8 is a line graph without a brake piece.
G shows a line graph with a brake piece in FIG.

Claims (6)

A brake mechanism for pressing and releasing the brake shoe on the outer periphery of the pneumatic tire of the drive wheel is provided on each of the left and right drive wheels, the left and right brake levers are connected by a wire cable, and the grip on the operation side of the brake mechanism is held. The brake shoe of the operated brake mechanism is pressed and released in conjunction with the operation to press and release the brake shoe, and the cable outer at one end of the wire cable is connected to the brake lever on the operation side. The cable inner at one end is fixed to the frame in front of the brake device on the extension line of the cable outer at one end, the other end of the cable inner is fixed to the brake lever at the operated side, and the other end of the cable outer is fixed. Is fixed to the bracket at the rear of the brake device along the other end of the cable inner, and the other brake lever is biased to the release side. That power spring and is provided, and the operation side and the braking force of the operated-side substantially equal, wheelchair handed operation braking device, characterized in that to further remove the operating linkage of the operated side. Using a wire cable with a sufficiently large capacity compared to the brake operation force applied to the wire, the movement amount of the brake shoe on the operation side and the operated side is made substantially equal, and the braking force of the left and right brakes is made equal. The brake device for one-handed operation of the wheelchair of Claim 1 characterized by these. The position of the wire cable attached to the brake lever is determined according to the load-bearing capacity of the wire cable, the distance from the swing center of the brake lever is different between the operating side and the operated side, and the operating side and the operated side The brake device for one-handed operation of a wheelchair according to claim 1, wherein the braking force of the wheelchair is substantially equal. The brake device for one-handed operation of a wheelchair according to claim 3, wherein the brake lever is extended and a wire cable having a smaller load resistance is used. At least the operating side includes a brake piece having a surface that presses a tread surface of a pneumatic tire of a drive wheel in an axle direction of the tire and a surface that suppresses a portion that deforms the tire in the width direction by the pressing surface. 2. The brake device for one-handed operation of a wheelchair according to claim 1, wherein the brake force on the operating side and the operated side is adjusted to be substantially equal by being fixed so as to operate integrally with the brake shoe. A brake piece having a surface that presses the tread surface of the pneumatic tire of the drive wheel in the axle direction of the tire and a surface that suppresses a portion that deforms the tire in the width direction by the pressing surface is provided on the operation side and the cover. The brake device for one-handed operation of a wheelchair according to claim 1, wherein the brake device is attached to both of the brake devices on the operation side and the brake force is hardly reduced even if the tire air pressure is reduced.

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