JP2002078751A - Wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheelchair capable of surely blocking the start of self- running in an unintended direction by preventing the erroneous operation of a brake lever. SOLUTION: This wheelchair is composed of a brake lever lock mechanism part 16 and brake parts respectively provided on a pair of wheels for blocking the rotations of a pair of wheels 12 by operating a brake lever 17 and each of brake parts is composed of a two-way rotation clutch mechanism for blocking the forward and backward rotations of wheels 12 when the brake lever 17 is located at a rising neutral position, permitting the forward rotation while blocking the backward rotation of the wheels 12 when the brake lever 17 is located at a forward inclining posture position and further permitting the backward rotation of the wheels 12 while blocking the forward rotation of the wheels 12 when the brake lever 17 is located at a backward inclining posture position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheelchair provided with a bidirectional rotary clutch mechanism.

[0002]

2. Description of the Related Art Conventionally, a wheelchair 1 having a configuration shown in FIG.
It has been known. In FIG. 15, reference numeral 2 denotes a wheelchair main body, and reference numerals 3 and 3 denote a pair of independently rotatable wheels.
4 is a pair of auxiliary wheels, 5 and 5 are hand rims. The hand rims 5, 5 are configured to rotate integrally with the wheels 3, 3. The wheelchair 1 is provided with a pair of brake mechanisms 6 to prevent rotation of the pair of wheels.

Each of the brake mechanisms 6 includes a brake lever 7 installed on the chair body so as to be able to fall down, a brake arm 8 for preventing wheel rotation, and a brake lever 7 and a brake arm 8 connected to each other. And a link portion (not shown) for transmitting the operation to the brake arm 8.

In this vehicle, when the user of the wheelchair 1 lowers the brake lever 7 backward, each brake arm 8
Bites into each wheel 3, 3 and the rotation of each wheel 3, 3 is prevented, and when the brake lever 7 falls down forward,
Biting of each brake arm 8 into each wheel 3, 3 is released, and rotation of each wheel 3, 3 in the forward direction and the reverse direction is permitted.

When the wheelchair user rotates the hand rims 5 and 5 in a direction in which the wheel rims 5 and 5 are desired to move in a state where the rotation of the wheels 3 and 3 is permitted, the wheel 3
3 rotates in the same direction as the rotation direction of the hand rims 5, 5, whereby the wheelchair 1 can be moved forward and backward. In addition, for example, when one of the hand rims 5 is rotated, the wheelchair 1 can be turned.

[0006]

However, in the conventional wheelchair 1, when the brake by the brake lever 7 is released, the rotation of the wheels 3, 3 in the forward direction and the reverse direction is unlocked, and the wheels 3, 3 are unlocked. Since three and three can rotate in both directions, if there is a gradient in the direction of travel of the wheelchair,
There is a case where the wheels 3 start to rotate and the wheelchair 1 starts running by itself even though the hand rims 5 and 5 are not operated at all. In particular, in the case of a steep road, when the wheelchair 1 starts self-propelled in the direction opposite to the direction in which the driver wants to travel, the self-propelled speed increases in time. Stopping self-propelled operation of the wheelchair 1 or stopping the rotation of the wheels 3 and 3 by strongly gripping the hand rims 5 and 5 may cause an abrupt braking, which may cause undesirable results.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and prevents rotation of a wheel in a direction opposite to a desired direction, and associates a desired direction with an operation direction of a brake lever. An object of the present invention is to provide a wheelchair capable of preventing erroneous operation of a brake lever and reliably preventing self-traveling in an unintended direction.

[0008]

According to a first aspect of the present invention, there is provided a wheelchair, wherein a brake mechanism for preventing rotation of a pair of wheels is provided on the wheelchair main body, and a pair of brake levers are set to a neutral position, a forward tilt position, and a vertical position. A brake lever lock mechanism for locking to the rearwardly inclined posture position, and a brake unit provided on each of the pair of wheels and preventing rotation of the pair of wheels by operating the brake lever. Prevents the rotation of the wheel in the forward direction and the rotation of the wheel in the reverse direction when the brake lever is in the standing neutral position, and in the reverse direction of the wheel when the brake lever is in the forward tilt position. The rotation in the forward direction is permitted while preventing the rotation, and the rotation in the forward direction of the wheel is prevented while the brake lever is in the backward tilt position. Characterized in that it is composed of two-way rotary clutch mechanism to allow rotation of the reverse direction of the wheels.

The wheelchair according to claim 2, wherein the two-way rotary clutch mechanism includes an inner race fixed to one of the chair body and the wheel, and an inner race fixed to the other of the chair body and the wheel. An outer race coaxial with the race, and provided between a peripheral wall of the inner race and a peripheral wall of the outer race to bite between the peripheral walls to prevent rotation of the wheels in a forward direction and allow rotation in a reverse direction. A reverse rotation permitting bite member, and between the peripheral wall of the inner race and the peripheral wall of the outer race, are provided at intervals in the rotational direction with respect to the reverse rotation permitting bite member to prevent rotation of the wheel in the reverse direction. Forward rotation permitting bite member that bites between the peripheral walls to allow rotation in the forward direction, and the reverse rotation permitting bite member and the forward A forward rotation permitting bite member and a reverse rotation permitting bite member which are provided between the rotation permission member and are driven in conjunction with the brake lever to be driven when the brake lever is in the standing neutral position. The forward rotation permission biting member is released when the brake lever is in the forward tilt position and the reverse rotation permission bite member is released when the brake lever is in the rearward tilt position. And a release member for releasing the bite of the horn.

[0010]

Next, an embodiment of a wheelchair of the present invention will be described with reference to the drawings.

In FIG. 1, a wheelchair 10 includes a chair body 1.
1, a pair of wheels 12 rotatably provided on the left and right sides of the chair body 11, a pair of auxiliary wheels 13 provided rotatably on the front left and right sides of the chair body 11, the chair body 11 and the wheels 12, And a pair of brake mechanisms 15 that are arranged between them to individually prevent the rotation of the pair of wheels 12.

The brake mechanism 15 is divided into a brake lever lock mechanism and a brake mechanism. The brake lever lock mechanism is, as shown in FIG.
1, a bracket 16 fixed to the horizontal frame 11 a, a brake lever (hereinafter simply referred to as a lever) 17 that rotates about a pin 17 a fixed to the bracket 16, and one end at the lower end of the lever 17. And a link arm 18 connected thereto.

As shown in FIG. 3A, the bracket 16 has a top plate 16b on which a guide groove 16a for defining a rotation position of the lever 17 about the pin 17a at three places is formed.
Is provided integrally. The guide groove 16a includes a bidirectional lock positioning portion 16c for positioning the lever 17 in a substantially upright neutral position state (upright state), and a forward direction allowable positioning portion (forward movement) for positioning the lever 17 in a forwardly inclined posture state (forwardly inclined state). A direction permitting positioning portion) 16d, and a reverse direction allowing positioning portion (march direction permitting positioning portion) 16e for positioning the lever 17 in the rearwardly inclined posture state (rearwardly inclined state) are provided.

Each of the positioning portions 16c to 16e includes a lever 1
Bracket 1 on which pin 17a, which is the center of rotation of 7 is fixed
When the position of the lever 17 is changed from one positioning portion to another positioning portion, the lever 17 is engaged with one positioning portion. Release, the lever 17 is bent to the side and moved toward another positioning portion, and the lever 1
7 is configured to be engaged with another positioning portion by releasing the bending of the lever 7, so that the lever 17 itself is elastically deformed (bent) to the side, so that the locked state between the lever 17 and the positioning portion is locked. Will be maintained.

The guide grooves need only maintain the posture of the lever 17 at a predetermined position, and are not limited to those having the shape shown in FIG. 3A. For example, the guide grooves 16a 'having the shape shown in FIG. , Guide groove 1 having the shape shown in FIG.
6a ".

In the case of the groove shape shown in FIG. 3B, when the lever 17 is operated in a direction away from the chair body 11 when the lever 17 is operated, the lever 17 can be guided and positioned along the guide groove. In the case of the guide groove 16a "shown in FIG. 3C, when the lever 17 is operated in the front-rear direction, the lever 17 is guided and positioned along the guide groove, thereby facilitating the operation.

In the case of the grooves shown in FIGS. 3B and 3C, since the positioning direction is constant, the lever 17 can be locked in position by a spring other than the bending elasticity of the lever 17 itself. .

The brake section comprises a bidirectional rotary clutch mechanism. As shown in FIGS. 4 to 6, the bidirectional rotary clutch mechanism includes a fixed unit 20 fixed to the chair body 11 and a wheel 1 provided coaxially with the fixed unit 20.
Lock forward, backward and bidirectional rotation of 2
The one-way clutch mechanism unit 30 and the two-way clutch mechanism unit 30
And a load control unit 40 that rotates integrally with the wheel 2 and that prevents a load from being transmitted to the two-way clutch mechanism unit 30 when a predetermined load or more is applied from the wheels 12.

The fixed unit 20 is a hub 1 of the wheel 12.
A screw shaft 21 for rotatably holding a hub shaft 19 a integral with the nut 9, a nut 22 screwed to a distal end portion 21 a of the screw shaft 21, a spring washer 23,
Washer 24, frame connecting member 25, and collar 2
6 is provided.

The frame connecting member 25 is fixed to the vertical frame 11b forming a part of the chair body 11 in a penetrating state. The vertical frame 11b has a frame through hole 2
5a and a shaft through hole 2 through which the screw shaft 21 passes
5b and an engagement projection 25c that engages with the collar 26 are integrally provided.

As shown in FIGS. 7A to 7C, the collar 26 has a seat 26a engaged with the engaging projection 25c, and a leg having a substantially oval cross section projecting from the seat 26a. 26b
And a shaft through hole 26c through which the screw shaft 21 penetrates across the seat 26a and the leg 26b.

The two-way clutch mechanism unit 30 includes:
Inner race 31 held non-rotatably on collar 26
An outer race 32 positioned on the outer periphery of the inner race 31 and held so as to be relatively rotatable;
Three sets of biting means 33, with one pair disposed between the two as one set
And a release member 34 rotatably held by the outer race 32 and a coaxial assembly (the screw shaft 21 penetrates) into which the outer race 32 and the release member 34 are fitted and fitted to the inner race 31.
A ring 35 and a nut 36 for assembling the two-way clutch mechanism unit 30 coaxially and integrally with the fixed unit 20 in cooperation with the nut 22 by screwing with the intermediate portion 21b of the screw shaft 21 are provided.

The inner race 31 has a disc-shaped base 3.
1a, a cylindrical portion 31b that is integrally raised from the center of the base 31a, and a cross-section substantially formed so as to extend from the cylindrical portion 31b to the base 31a, penetrates the leg 26b, and substantially matches the cross-sectional shape of the leg 26b. Oval-shaped through hole 31c
And a C-ring 3 formed near the protruding end of the cylindrical portion 31b.
8A, a sector 31e radially protruding from a trisection point of the cylindrical portion 31b, and a recess formed between the adjacent sector 31e as shown in FIG. 31f, and a flat portion 31g formed between the sector protrusion 31e and the concave portion 31f.

The outer race 32 has a small-diameter cylindrical portion 32a.
And a large-diameter cylindrical portion 32b are integrally formed to form a multi-stage cylindrical shape. The base 31a is engaged with a step 32c formed inside the outer race 32 due to the difference in diameter. Further, a biting space K is formed by the inner wall surface 32d of the small-diameter cylindrical portion 32a and the flat portion 31g. As shown in FIG. 8 (B), the digging space K is formed by the cross section straight line of the flat section 31g and the cross section curve of the inner wall surface 32d.
The gaps L2 and L3 between both ends of the cross section of the flat portion 31g and the opposing inner wall surface 32d are narrower toward the end than the gap L1 between the center of the cross section and the inner wall surface 32d opposing the same. Further, a screw member 37 protrudes from the lower end surface of the large-diameter cylindrical portion 32b.

As shown in FIGS. 9A and 9B, the screw member 37 has a screw portion 3 which is screwed to one end of the large-diameter cylindrical portion 32b.
7a and a pin 3 protruding from the lower end surface of the large-diameter cylindrical portion 32b.
7b and a large-diameter cylindrical portion 32 formed on the end face of the pin 37b.
A slit 37c for engaging a tool (for example, a flathead screwdriver) for screwing the screw portion 37a into b is formed. The screw members 37 are provided at quadrants of the large-diameter cylindrical portion 32b.

The biting means 33 includes a pair of cylindrical rollers 38 and a pair of leaf springs 39 having a substantially N-shaped cross section. The pair of rollers 38 and the pair of leaf springs 39 are provided between the fan-shaped projections 31e of the biting space K, respectively, and three pairs are arranged as one pair. The leaf spring 39 is in contact with the fan-shaped projection 31 e of the biting space K. Leaf spring 39
Always urges the rollers 38 toward the narrower facing space of the biting space K, whereby the rollers 38 bite into the biting space K.

The release member 34 includes a base 34b having a protruding hole 34a from which the tip of the cylindrical portion 31b protrudes, a vertical wall 34c located at the peripheral edge of the base 34b and engaging with the small-diameter cylindrical portion 32a in a spigot-like manner. The concave portion 31 protrudes from the trisection point of the base 34b inside the vertical wall 34c.
and a connecting arm 34e protruding from the vertical wall 34c.

The connecting arm 34e has a link arm 1
8 is connected and the lever 17 is tilted forward, the connecting arm 34e is rotated rearward (counterclockwise in FIG. 2) of the chair body 11 and the lever 17 is tilted backward. The connecting arm 34e pivots forward (clockwise in FIG. 2) of the chair body 11. Therefore, when the lever 17 is tilted forward, as shown in FIG.
When d rotates to the rear of the chair body 11 and the lever 17 is tilted backward, as shown in FIG.
Pivots forward of the chair body 11.

As a result, the rotation of the outer race 32 (small-diameter cylindrical portion 32a) in the counterclockwise direction in FIG. 10A is caused by the rotation of the roller 3 positioned in the clockwise direction of the sector arm 34d.
8 is prevented by biting into the biting space K.
Further, the outer race 3 in the clockwise direction in FIG.
The rotation of 2 is prevented by the roller 38 located in the counterclockwise direction of the fan-shaped arm 34d biting into the biting space K.

The load control unit 40 includes a base disk 42 fixed to the hub 19 by hub fixing screws 41,
A brake plate 43 having one surface in contact with the base disk 42, a disc spring 44 for urging the brake plate 43 toward the base disc 42, and a plate 45 for bending to generate the urging force of the disc spring 44; And a cover 47 fixed to the base disk 42 by screws 46.

The base disk 42 is shown in FIGS. 11A and 11B.
As shown in the figure, a through hole 42b formed at the center of the circular flat plate 42a and through which the screw shaft 21 penetrates, and the circular flat plate 4
The shaft through hole 4 is formed on the back surface of 2a (the bottom surface of FIG. 11A).
A concave portion 42c having a diameter larger than that of the concave portion 42b;
And a female screw hole 42d formed at an outer trisquare position and screwed with the hub fixing screw 41, and a female screw formed at a quadrant position near the outer periphery of the circular flat plate 42a and screwed therein. And a screw hole 42e.

FIGS. 12A and 12B show the brake plate 43.
As shown in FIG. 5, a through hole 43a formed at the center and through which the screw shaft 21 penetrates, and a pin through hole 43b through which the pin 37b of the screw member 37 penetrates. In addition, a brake member (such as a sandblast-like material or rubber) having a high friction coefficient is provided on the back surface of the brake plate 43 (the surface in contact with the base disk 42), or a surface treatment having the same friction coefficient is performed. It has been subjected.

As shown in FIGS. 13A and 13B, the plate 45 has a through hole 45a formed at the center and through which the screw shaft 21 passes, and a pin through hole 45b through which the pin 37b of the screw member 37 passes. And a positioning recess 45 c for positioning the disc spring 44.

As shown in FIGS. 14A and 14B, the cover 47 includes a brake plate 43, a disc spring 44, and a plate 45.
The cylindrical storage part 47a in which the
A cover 47b that cooperates with the base disc 42 to hold the brake disc 43 in cooperation with the base disc 42 so that the disc spring 44 is deflected via 5 and the brake disc 43 is urged toward the base disc 42. An opening 47c formed and in which the large-diameter cylindrical portion 32b is located;
An annular flange 47e in which a fixing hole 47d through which the screw 46 penetrates or is screwed is formed at a quadrant position.

In the above configuration, when the lever 17 is erected and the halfway portion thereof is engaged with the bidirectional lock position portion 16c, the lever 17 having the pin 17a as the rotation center when viewed from the direction of arrow A in FIG. 17, the link arm 1
The release member 34 is rotated via 8, and the connecting arm 34e thereof is in a state of facing directly upward in FIG.

In this state, as shown in FIG. 8A, the base of the fan-shaped arm 34d is located substantially in the middle of the concave portion 31f, and the rollers 38 located at both ends of the fan-shaped arm 34d are in non-contact. Has become.

Accordingly, the rollers 38 located at both ends of the fan-shaped arm 34d are pushed out into a narrow gap L2 (see FIG. 8B) by the bias of the leaf spring 39, whereby the inner wall surface 32d
The roller 38 cuts into both the outer race 32 and the flat portion 31g, and the rotation of the outer race 32 is prevented.

Since the outer race 32 is connected to the hub 19 of the wheel 12 by frictional force via the load control unit 40, the rotation of the wheel 12
Is locked in both directions.

In such a two-way locked state of the wheels 12, it is possible to exert an effect of preventing the running of the wheelchair 10 when getting in and out of the wheelchair 10 or in an empty state.

Here, for example, from the bidirectional locked state in which the lever 17 is erected, the lever 17 is tilted forward and backward about the pin 17a as the center of rotation, thereby allowing the forward direction allowable position portion 16d.
When the lever 17 is engaged with the lever 17, the release member 34 is rotated via the link arm 18 in conjunction with the rotation of the lever 17, and the connecting arm 34e is turned obliquely rearward in FIG.

In this state, as shown in FIG. 10A, the base of the sector arm 34d is located on the left side of the concave portion 31f and contacts the roller 38 located on the left end of the sector arm 34d.

Therefore, the roller 38 located at the left end of the fan-shaped arm 34d has a wide gap L1 against the bias of the leaf spring 39.
(See FIG. 8 (B).), And the bite of the roller 38 into both the inner wall surface 32d and the flat portion 31g is released.
The roller 38 located at the right end of the fan-shaped arm 34d is pushed into the narrow gap L2 (see FIG. 8B) by the bias of the leaf spring 39, and the roller 38 bites into both the inner wall surface 32d and the flat portion 31g. To maintain the rotation stop state of the outer race 32.

Since the outer race 32 is connected to the hub 19 of the wheel 12 by frictional force via the load control unit 40, one of the outer races 32 is allowed to rotate and the other is prevented from rotating, so that the outer race 32 moves in the forward direction of the wheel 12. Only rotation (clockwise in the state of arrow A) is allowed, and only rotation in the reverse direction of the wheel 12 (counterclockwise in the state of arrow A) is locked.

In such a reverse lock state, only rotation of the wheel 12 in the forward direction is permitted, as in the case of traveling on an uphill, and rotation of the wheel 12 in the reverse direction is locked. It can be effective for prevention and the like.

Further, for example, when the lever 17 is rotated backward from the bidirectional locked state in which the lever 17 is erected and the pin 17a is the center of rotation, the lever 17 is engaged with the reverse direction allowable position portion 16e. The release member 34 rotates via the link arm 18 in conjunction with the rotation of the lever 17, and the connecting arm 34e is turned obliquely forward in FIG.

In this state, as shown in FIG. 10B, the base of the sector arm 34d is located on the right side of the concave portion 31f and contacts the roller 38 located at the right end of the sector arm 34d.

Therefore, the roller 38 located at the right end of the fan-shaped arm 34d has a large gap L1 against the bias of the leaf spring 39.
(See FIG. 8 (B).), And the bite of the roller 38 into both the inner wall surface 32d and the flat portion 31g is released.
The roller 38 located at the left end of the fan-shaped arm 34d is pushed into the narrow gap L2 (see FIG. 8B) by the urging of the leaf spring 39, and the roller 38 cuts into both the inner wall surface 32d and the flat portion 31g. To maintain the rotation stop state of the outer race 32.

Since the outer race 32 is connected to the hub 19 of the wheel 12 by frictional force via the load control unit 40, one of the outer races 32 is allowed to rotate and the other is prevented from rotating. Only rotation (counterclockwise in the state of arrow A) is allowed, and only rotation in the forward direction of the wheel 12 (clockwise in the state of arrow A) is locked.

In such a forward lock state, not only is it prevented from unexpectedly jumping out while waiting for a traffic light, but also if there is a right or left turning vehicle, the right or left turning vehicle is shifted to the inner wheel difference. Wheelchair 1 to avoid approach
The effect can be exerted when, for example, 0 is moved backward.

That is, according to this, the brake lever lock mechanism is provided on the wheelchair main body 11 and functions to lock the pair of levers 17 between the upright neutral position, the forward tilt position and the rear tilt position, The brake units are provided on the pair of wheels 12 and serve to prevent rotation of the pair of wheels 12 by operating the lever 17.

The brake portion prevents the rotation of the wheel 12 in the forward direction and the reverse direction when the lever 17 is in the upright neutral position, and prevents the rotation of the wheel 12 in the reverse direction when the lever 17 is in the forwardly inclined position. A two-way rotary clutch mechanism that permits rotation in the forward direction while preventing rotation, and that allows the wheel 12 to rotate in the reverse direction while preventing rotation of the wheel 12 in the forward direction when the lever 17 is in the backward tilt position. Works.

The bi-directional rotary clutch mechanism has an inner race 3 for preventing one of the pair of rollers 38 from rotating in the forward direction of the wheel 12 and allowing the wheel 12 to rotate in the reverse direction.
1 and the outer race 32 function as a reverse rotation permitting biting member that bites between the peripheral walls, and the other of the pair of rollers 38 prevents the rotation of the wheel 12 in the backward direction and allows the peripheral wall to rotate in the forward direction. The release member 34 functions as a forward rotation permission biting member that bites between, and the release member 34 is located between the reverse rotation permission bite member and the forward rotation permission member, and is driven in conjunction with the lever 17 so that the lever 17 is in the standing neutral position. , The forward rotation permission biting member and the reverse rotation permission biting member are maintained at the forward / reverse blocking position, and when the lever 17 is in the forward inclined position, the biting of the forward rotation permission biting member is released.
7 functions as a release member for releasing the bite of the reverse rotation permission biting member when in the rearwardly inclined posture position.

In this embodiment, the lever 17 is connected to the chair body 11.
Are provided on the left and right sides of the
When the wheelchair 7 is engaged with the bidirectional lock position 16c, the forward and backward traveling of the wheelchair 10 is stopped. Also, the one lever 17 is moved to the bidirectional lock position portion 16.
c, the other lever 17 is engaged with the forward direction allowable position portion 16d, and the hand rim 12a of the wheel 12 on the other lever 17 side is pushed out and rotated, so that the wheel on one lever 17 side is rotated. The wheelchair 10 around the center of rotation 12 can be turned forward (for example, U-turn), and the other lever 17 is engaged with the reverse direction allowable position portion 16e, and the hand rim of the wheel 12 on the other lever 17 side By pulling back and rotating the wheel 12a, the wheelchair 10 around the wheel 12 on one lever 17 side can be turned backward (for example, U-turn). Further, one of the levers 17 is engaged with the forward direction allowable position portion 16d, and the other lever 17 is engaged with the reverse direction allowable position portion 16e.
By pulling out and rotating the hand rim 12a of the wheel 12 on the other lever 17 side while pushing out and rotating the second hand rim 12a, the wheel chair 10 can be rotated around the wheel chair 10 itself.

Since the wheels 12 and the two-way clutch mechanism unit 30 are connected to each other via the load control unit 40, the spring pressure of the load control unit 40 (the urging force of the disc spring 44) is set. ) Also, by setting the friction coefficient of the brake plate 43, the wheels 12
When the wheel 12 is rotated smoothly and a large load due to the climbing of a step or the like is transmitted from the wheel 12, the brake plate 43 slips against the bias of the disc spring 44 by an amount corresponding to absorbing the load. 2-way clutch mechanism unit 3
The excessive load from the wheels 12 is not transmitted to 0, and partial damage and deterioration over time of the two-way clutch mechanism unit 30 are prevented.

[0055]

According to the present invention, the rotation of the wheel in the forward direction and the rotation of the wheel in the reverse direction are prevented at the neutral position of the brake lever, and when the brake lever is tilted forward from the neutral position, the rotation of the wheel is prevented. Reverse rotation is prevented, but the forward rotation of the wheel is permitted, and when the brake lever is tilted backward, the forward rotation of the wheel is blocked, but the reverse rotation of the wheel is permitted, and the brake lever is released. Since the falling direction of the vehicle and the direction of rotation of the wheels are made to coincide with each other, it is possible to prevent the brake lever from being erroneously operated in the direction opposite to the direction in which it is desired to proceed. In addition, since the rotation of the wheel in the direction opposite to the direction in which it is desired to travel is prevented, safety is further improved.

[Brief description of the drawings]

FIG. 1 shows a wheelchair according to a first embodiment of the present invention,
It is an external appearance perspective view of a wheelchair.

FIG. 2 is also a side view of one operation unit.

3A is a plan view of a main part of an example of a guide groove shape, FIG. 3B is a plan view of a main part of a modification of the guide groove shape, and FIG. It is a top view of the principal part of an example.

FIG. 4 is an exploded perspective view of the brake mechanism.

FIG. 5 is a cross-sectional view of a part of the brake mechanism.

FIG. 6 is also a front view in which a part of a brake mechanism is omitted.

7A is a plan view of the collar, FIG. 7B is a cutaway view of the collar, and FIG. 7C is a bottom view of the collar.

FIG. 8A is a sectional view of a main part of the clutch mechanism,
(B) is an explanatory view of a gap.

FIG. 9A is a front view of the screw member, and FIG. 9B is a bottom view of the screw member.

10A is an explanatory view of the operation of the main part in the forward direction allowable state when viewed from the direction of arrow A in FIG. 1, and FIG. 10B is the reverse direction when viewed from the direction of arrow A in FIG. It is operation | movement explanatory drawing of the principal part of an allowance state.

FIG. 11A is a cross-sectional view of a base disk,
(B) is a bottom view of the base disk.

FIG. 12A is a sectional view of a brake plate,
(B) is a bottom view of the brake plate.

13A is a cross-sectional view of a plate, and FIG.
Is a bottom view of the plate.

FIG. 14A is a cross-sectional view of the cover, and FIG. 14B is a bottom view of the cover.

FIG. 15 is an external perspective view of a conventional wheelchair.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Wheelchair 11 ... Chair body 12 ... Wheel 16 ... Bracket (brake lever lock mechanism part) 17 ... Brake part 30 ... Two-way clutch mechanism unit part (bidirectional rotary clutch mechanism)

Claims (2)

[Claims] A brake mechanism for preventing rotation of a pair of wheels is provided on a wheelchair body, and a pair of brake lever locks locks the pair of brake levers to a standing neutral position, a forward leaning posture position, and a rearward leaning posture position. A mechanical portion, and a brake portion provided on each of the pair of wheels and for preventing rotation of the pair of wheels by operating the brake lever, wherein the brake portion is provided when the brake lever is in the upright neutral position. Blocking the rotation of the wheel in the forward direction and the rotation of the wheel in the reverse direction, and permitting the rotation of the wheel in the forward direction while preventing the rotation of the wheel in the backward direction when the brake lever is in the forward tilt position, Further, when the brake lever is in the rearwardly inclined position, the bidirectional rotation clutch that allows the wheel to rotate in the backward direction while preventing the wheel from rotating in the forward direction. A wheelchair comprising a latch mechanism. 2. The two-way rotating clutch mechanism includes: an inner race fixed to one of the chair body or the wheel; and an outer race fixed to the other of the chair body or the wheel and coaxial with the inner race. A reverse rotation permitting biting member provided between the peripheral wall of the inner race and the peripheral wall of the outer race to prevent rotation of the wheels in the forward direction and to bite between the peripheral walls to permit rotation in the reverse direction; A gap is provided in the rotation direction between the peripheral wall of the inner race and the peripheral wall of the outer race with respect to the reverse rotation permission biting member to prevent rotation of the wheel in the reverse direction and prevent rotation of the wheel in the forward direction. A forward rotation permitting bite member that bites between the peripheral walls to permit, and is provided between the reverse rotation permitting bite member and the forward rotation permitting member. When the brake lever is driven in conjunction with the brake lever and the brake lever is in the upright neutral position, the forward rotation permission biting member and the reverse rotation permission biting member are maintained at the forward / reverse blocking position and the brake A release member that releases the bite of the forward rotation permission biting member when the lever is in the forward tilt position and releases the bite of the reverse rotation permission bite member when the brake lever is in the rearward tilt position; The wheelchair according to claim 1, comprising: