JP2000065087A - Manually traveling car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent self-traveling of a wheelchair at traveling time and stopping time on a slope by providing a two-way clutch mechanism for locking normal/reverse bidirectional rotation of traveling wheels at ordinary time and making free rotation of the traveling wheels by an operation lever. SOLUTION: When a retainer 4 is pressed by external force F, the retainer 4 is elastically deformed to the inside diameter side, the engaging projection part 9 meshes with a retainer fixing groove 7, rotational directional clearance is eliminated, and the retainer 4 is held in the rotational direction by an inner ring 1, so that the whole number of rollers 3 are held in the central part of the cam surface 6, and rotation of an outer ring 2 is made free in the normal/reverse direction. When the outer ring 2 rotates to the inner ring 1 in an external force F nonexistent state, the retainer 4 followably rotates by frictional force by an elastic body 5, the rollers 3 are pushed away to the shallow side of the cam surface 6 by the retainer 4 to engage by a wedge with the cam surface 6 and the circumferential surface 2a of the outer ring 2, so that the outer ring 2 is locked in the direction after rotating by a small angle. The external force F is eliminated by releasing hand from an operation lever, and normal/ reverse directional rotation of the outer ring 2 and traveling wheels is locked, so that a manual wheelchair can be stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual traveling vehicle for manually traveling with a person or an object on it, for example, a manual wheelchair, a baby carriage, a hand-carriage vehicle, and the like.

[0002]

2. Description of the Related Art In a manual wheelchair, for example, a brake lever is provided in the vicinity of a handshake, and when an assistant squeezes the brake lever together with the handshake, a brake is actuated to stop running wheels.

[0003]

When a caregiver carelessly releases his / her hand from a handshake while traveling or stopping on a slope, the wheelchair may run by itself.

An object of the present invention is to solve the above-mentioned disadvantages in operation of a conventional manually driven vehicle.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a main body on which an object to be conveyed is mounted, an operation lever provided on the main body, an axle supported by the main body, and an axle rotatable on the axle. A locking means provided between the running wheel to be supported, the axle and the running wheel, which always locks the rotation of the running wheel in both forward and reverse directions with respect to the axle, and a lock state by the locking means in conjunction with the operation of the operation lever. And a two-way clutch mechanism having lock release means for releasing the running wheel in both the forward and reverse directions with respect to the axle.

[0006] The "two-way clutch mechanism" has two modes: forward and reverse bidirectional rotation lock of the traveling wheel, and forward and reverse bidirectional rotation free. The normal mode is forward / reverse bidirectional rotation lock, and the operation mode is forward / reverse bidirectional rotation free. Switching between the normal mode and the operation mode can be performed by turning on / off the lock release means. The ON / OFF of the unlocking means is performed in conjunction with the operation of the operating lever. When the operating lever is operated, the unlocking means is turned ON.
(Operation mode), the unlocking means is OFF (constant mode) when not operated. Therefore, when the operation lever is operated (operation mode), the rotation of the traveling wheel is free in both the forward and reverse directions, and the manually traveling vehicle can be made to travel. When the operation lever is released (always mode), the traveling wheel is released. Is locked in both the forward and reverse directions, and the manually driven vehicle stops at that position and stops moving. The operating lever and the locking means of the two-way clutch mechanism can be connected by, for example, a cable wire.

[0007] The two-way clutch mechanism as described above is provided "between the axle and the running wheel". This two-way clutch mechanism includes a two-way clutch as a unitary structure interposed between the axle and the running wheel. In this case, both the case where at least one of the axle and the traveling wheel is a component of the two-way clutch mechanism is included.

In the above structure, the locking means of the two-way clutch mechanism is formed by the outer wheel fixed to the traveling wheel, the axle or the inner wheel fixed thereto, and the engaging element interposed therebetween. A wedge is used in both forward and reverse directions, and the unlocking means is a retainer for controlling the position or orientation of the engaging element in the rotational direction. And a positioning means for holding at a neutral position separating from the wedge in both the forward and reverse directions. Following the rotation of the running wheel (and the outer wheel), the engagement element engages with the wedge in both the forward and reverse directions, so that the forward and reverse rotation of the running wheel is automatically locked. The locked state is released by holding the retainer at the neutral position and disengaging the engagement element from the wedge in both the forward and reverse directions.

As the "engagement element", those having a circular cross section such as a roller and a ball, and those having a non-circular cross section such as a sprag can be used. When using an engaging element having a circular cross section such as a roller or a ball, one of the outer ring and the axle (or the inner ring) is provided with a circumferential surface, the other is provided with a cam surface, and the circumferential surface and the cam surface are provided. An engaging element is disposed between the two.
The engaging element shall be disengaged from the wedges in both the forward and reverse directions when held at the disengagement position of the cam surface.For example, the cam surface may have a shape such that the center part in the rotational direction is deep and gradually becomes shallow toward both sides, This can be achieved by a configuration in which the clearance between the cam surface and the circumferential surface at the center portion where the cam surface is separated causes a slight clearance with respect to the diameter of the engaging element. The engaging element is wedge-engaged with both the outer ring and the axle (or the inner ring) when moved to the shallow side of the cam surface. When using an engaging element having a non-circular cross section such as a sprag,
A circumferential surface is provided on both the outer ring and the axle (or inner ring), a cam surface is provided on the engaging element, and the engaging element is arranged between the circumferential surfaces. The engaging element shall be disengaged from the wedges in both the forward and reverse directions when held in the neutral position, for example, in the neutral position of the engaging element,
This can be achieved by creating some clearance between the circumference. The engaging element is wedge-engaged with both the outer wheel and the axle (or inner wheel) when the posture changes in the rotation direction.

[0010] The "positioning means" may be an uneven engagement portion provided between one of the outer ring and the axle (or the inner ring) and the retainer. This concave / convex engaging portion
When the operation levers are not operated, they are loosely engaged with each other to allow relative movement within a predetermined range in the rotation direction of the retainer, and interlock with the operation of the operation lever to closely engage with each other and hold the retainer at the neutral position. And In a state where the relative movement of the retainer in the rotation direction within the predetermined range is allowed, the engaging element can engage with the wedge in both the forward and reverse directions. Further, when the retainer is held at the neutral position, the engagement element is separated from the wedge in both the forward and reverse directions.

The engaging operation of the engaging element with the wedge in both the forward and reverse directions is as follows.
Friction force due to rotation of outer ring (friction force between engagement element and outer ring, or friction force between engagement element and axle or inner ring)
However, by utilizing the relative movement of the retainer in the rotation direction, the above-described engagement operation can be further ensured. When using an engaging element having a circular cross section such as a roller and a ball, the engaging element is moved in both forward and reverse directions by a relative movement of the retainer in the rotation direction,
More specifically, it pushes into the shallow portions on both sides of the cam surface. When an engaging element having a non-circular cross section, such as a sprag, is used, the attitude of the engaging element is changed in a direction in which wedges are formed in both forward and reverse directions by relative movement of the retainer in the rotation direction. The operation of such a retainer is performed, for example, by interposing an elastic body that generates a predetermined frictional force between one of the outer ring and the axle (or the inner ring) and the retainer. This can be achieved by causing the retainer to rotate with the outer ring or the retainer with the axle (or the inner ring).

In order to enable smooth running, a rolling bearing means can be provided between the running wheel and the axle in parallel with the two-way clutch mechanism. An outer ring serving also as a clutch outer ring of the two-way clutch mechanism and a bearing outer ring of the rolling bearing means can be fixed to the traveling wheels.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a manual wheelchair will be described below.

FIG. 1 conceptually shows a manual wheelchair of this embodiment. The chair body 30 on which a seated person is placed is mainly composed of a body frame 30a, and a seating seat 30b and a backrest seat 30c provided on the body frame 30a. A step 30d is mounted on the lower front part of the main body frame 30a, an armrest 30e is provided on the side of the central seat 30b, and a handshake 30f extending rearward is provided on the upper rear part. And this chair body 3
At 0, the running wheel 31 and the auxiliary wheel 32 are rotatably mounted,
It is configured as a wheelchair that can run on the floor (road surface).

The running wheels 31 are rotatably mounted on the axle 20 supported by the body frame 30a via a two-way clutch X described later. The two-way clutch X is connected via a cable wire 34 to an operation lever 33 provided below and close to the handshake 30f, and when the assistant grasps the operation lever 33 together with the handshake 30f, the two-way clutch X By this, the rotation of the traveling wheel 31 in both the forward and reverse directions is released, and the wheelchair can freely travel. When the assistant releases the operating lever 33, the two-way clutch X causes the traveling wheel 31 to rotate in both the forward and reverse directions. The rotation is locked and the wheelchair stops at that position.

FIGS. 2 and 3 show the two-way clutch X interposed between the traveling wheel 31 and the axle 20. FIG. The two-way clutch X includes an inner race 1 fitted and fixed to the axle 20.
And an outer ring 2 fitted and fixed to the boss of the running wheel 31, a roller 3 as an engaging element having a circular cross section, a retainer 4 for holding the roller 3, and a ball 3a as a rolling element. As constituent elements, a lock unit 12 and a lock release unit 13 described later are provided.

As shown in FIG. 4, on the outer peripheral surface of the inner ring 1,
A plurality of cam surfaces 6 are provided at regular intervals on the circumference, and the track surface 1 of the ball 3a is axially separated from the area where these cam surfaces 6 are formed.
b is provided. Each cam surface 6 is formed so that the center in the circumferential direction is deep and gradually becomes shallow toward both sides, and has a substantially V-shaped cross-sectional shape. The cam surface may be a straight line as shown in FIG. 5 (A) or a curved surface such as a concave arc as shown in FIG. 5 (B). The V-shaped opening angle α of the cam surface 6 is, for example, 1
It is set to 55 ° to 175 °.

On the outer peripheral surface of the end of the inner race 1 on the side where the cam surface 6 is formed, retainer fixing grooves 7 are provided at a plurality of positions in the circumferential direction. For example, the retainer fixing groove 7 is
Are provided alternately. The retainer fixing groove 7 has a cross-sectional shape in which the center of the groove width is deep, and has a substantially V-shaped cross-sectional shape in this example. The V-shaped slope is the cam surface 6
It is steeper than that of.

As shown in FIGS. 2 and 3, on the inner periphery of the outer race 2, there is provided a circumferential surface 2a facing the cam surface 6 of the inner race 1, and a raceway surface 2b facing the raceway surface 1b of the inner race 1. Have been. Rollers 3 are arranged between the respective cam surfaces 6 of the inner ring 1 and the circumferential surface 2 a of the outer ring 2, and are held by a retainer 4. The locking means 12 is constituted by the cam surface 6, the circumferential surface 2a, and the roller 3 disposed therebetween. Also,
A plurality of balls 3a are arranged between the raceway surface 1b of the inner race 1 and the raceway surface 2b of the outer race 2, and are held by a retainer 4a. Thereby, rolling bearing means is constituted. In this example, the outer ring 2 is formed to be narrower than the inner ring 1 so that the outer peripheral surface of the retainer 4 on the side of the engaging projection 9 described later is exposed.

As shown in FIG. 6, the retainer 4 is formed in an annular shape, and window-shaped pockets 8 for accommodating the rollers 3 are formed at a plurality of positions in the circumferential direction. Engaging projections 9 engaging with the fixing grooves 7 and spring fixing pins 10 are provided at a plurality of positions in the circumferential direction, respectively. The engaging projection 9 is provided on the inner peripheral surface of the retainer 4 and has a triangular mountain shape. The spring fixing pin 10 is provided on an end surface of the retainer 4 opposite to the end surface on the side of the engaging projection 9. The engagement projection 9 of the retainer 4 and the retainer fixing groove 7 of the inner ring 1
The positioning means 14 is constituted. Further, the positioning means 14 and the retainer 4 constitute the unlocking means 13.

FIG. 7 shows a state in which the elastic body 5 is attached to the retainer 4. The elastic body 5 includes a ring-shaped side plate 5a,
Arm-shaped spring piece 5b extending radially from side plate 5a
And a leaf spring. The spring piece 5b is connected to the side plate 5
a, which extends obliquely to the outer diameter side and is bent so that the front end portion is substantially parallel to the axial direction.
Elastically contact the inner peripheral surface of the The elastic body 5 is fixed to the retainer 4 by inserting a spring fixing pin 10 provided on the retainer 4 into a hole of the side plate 5a and caulking. The elastic body 5 may be fixed by welding, screwing, tacking, bonding, or the like, instead of caulking.

The elastic member 5 may be any member as long as the retainer 4 can follow the rotation of the outer ring 2 and have a function of being accompanied by a constant frictional force. Is also good. For example, a ring-shaped elastic body such as an O-ring is fitted to the outer peripheral surface of the retainer 4 and is brought into elastic contact with the inner peripheral surface of the outer ring 2, or an O-ring or the like is attached to the inner peripheral surface of the outer ring 2. The ring-shaped elastic body may be fitted and elastically contact the outer peripheral surface of the retainer 4. Instead of the O-ring, a wire spring or a leaf spring bent in a waveform may be used. Alternatively, an elastic body is locally embedded in the outer peripheral surface of the retainer 4 and is brought into elastic contact with the inner peripheral surface of the outer ring 2, or the elastic body is locally embedded in the inner peripheral surface of the outer ring 2. This may be brought into elastic contact with the outer peripheral surface of the retainer 4. Further, instead of disposing the elastic body, the retainer 4 may be formed in a polygonal shape or a convex portion may be provided on the outer peripheral surface of the retainer 4 so that a plurality of locations in the circumferential direction of the retainer 4 A constant frictional force such that the retainer 4 itself comes into contact with the outer ring 2 and is caused to follow the outer ring 2 by the elasticity of the retainer 4 itself may be obtained.

FIG. 8A shows that, in the natural state, the retainer 4 is located at the neutral position in the rotational direction, and the roller 3 is
3 shows a state when it is located at the center (separation position) of the. At this time, the rotational projection phases of the engaging projections 9 of the retainer 4 and the retainer fixing grooves 7 of the inner ring 1 match each other, and a rotational gap and a radial gap exist between the two. Also,
The distance between the central portion of the cam surface 6 of the inner ring 1 and the circumferential surface 2a of the outer ring 2 is set to a size that produces a radial clearance with respect to the diameter of the roller 3. Further, the pocket 8 of the retainer 4 for accommodating the roller 3 has a small gap in the rotational direction between the roller 3 and the roller 3 (for example, 1% or less of the diameter of the roller 3) or a negative gap. Designed.

FIG. 8B shows a state in which a predetermined external force F is applied to the retainer 4 and the retainer 4 is held at the neutral position. When the retainer 4 is pressed in the radial direction from the outer diameter side by an external force F, the pressed portion of the retainer 4 is elastically deformed to the inner diameter side, and the engaging projection 9 is closely engaged with the retainer fixing groove 7. .
As a result, the rotational gap between the engaging projection 9 and the retainer fixing groove 7 is eliminated, and the retainer 4 is retained in the rotational direction with respect to the inner ring 1 while the retainer 4 is positioned at the neutral position. . As a result, all the rollers 3 are held at the center of the cam surface 6, and the rotation of the outer ring 2 is free in both the forward and reverse directions. At this time, the rotation of the outer race 2 with respect to the inner race 1 is rotatably supported by a plurality of balls 3a interposed between the raceway surface 1b of the inner race 1 and the raceway surface 2b of the outer race 2. In addition, it is desirable that the portion where the retainer 4 is pressed by the external force F is a portion divided into two to four equally in the circumferential direction.

The outer ring 2 is moved from the state shown in FIG.
, The cage 4 rotates following the rotation of the outer race 2 under the influence of the frictional force of the elastic body 5. as a result,
The roller 3 held in the pocket 8 of the retainer 4 is pushed by the retainer 4 toward the shallow side of the cam surface 6, and is wedge-engaged with both the cam surface 6 and the circumferential surface 2a. This allows
After rotating the outer race 2 by a small rotation angle, it is locked in that direction. For example, as shown in FIG.
When the roller rotates clockwise, the retainer 4 follows the outer ring 2 and rotates in the clockwise direction, and the roller 3 is pushed by the retainer 4 so that both the cam surface 6 and the circumferential surface 2a engage with the wedge in the clockwise direction. Combine.
Therefore, the outer ring 2 is locked clockwise after rotating by a small rotation angle. At this time, the engaging projection 9 of the cage 4
And the retainer fixing groove 7 of the inner ring 1 are set to dimensions so as not to interfere with each other. As shown in FIG. 9B, when the outer ring 2 rotates counterclockwise, the retainer 4 follows the outer ring 2 and rotates in the counterclockwise direction, and the roller 3 is pushed by the retainer 4 and the cam surface is rotated. 6 and the circumferential surface 2a are wedge-engaged counterclockwise. Therefore, the outer ring 2 is locked counterclockwise after rotating by a small rotation angle. At this time, the dimensions are set so that the engaging projection 9 of the retainer 4 and the retainer fixing groove 7 of the inner ring 1 do not interfere with each other. As described above, when the external force F is not acting, the outer race 2 is automatically locked in both the forward and reverse directions. When the roller 3 is engaged with the wedge, the angle β between the roller 3 and the contact point between the cam surface 6 and the circumferential surface 2a is 5 to 25 ° {180 °-(155 ° to 175 °). Half of this angle (β / 2) is known as a typical clutch strut angle.

Switching between the state (operation mode) shown in FIG. 8B (operation mode) and the state shown in FIG. 9 (constant mode) is performed by switching ON / OFF of the external force F applied to the retainer 4, and the switching is performed as shown in FIG. The operation is performed in conjunction with the operation of the operation lever 33 shown in FIG. That is, the operation of the operation lever 33 and the operation of the ON / OFF operation mechanism of the external force F (not shown) are related by the cable wire 34. When the operation lever 33 is operated, the operation mechanism is operated by the cable wire 34. Actuation, the external force F is applied to the retainer 4, and the operation mode (free in both forward and reverse directions) shown in FIG. On the other hand, when the hand is released from the operation lever 33, the external force F by the operation mechanism is eliminated, and the operation mode is changed to the constant mode shown in FIG. Therefore, the assistant shakes the hand 30f.
When the operating lever 33 is simultaneously gripped, the forward and reverse rotations of the outer wheel 2 and the running wheel 31 are made free by the two-way clutch X, so that the wheelchair can run freely, and the assistant releases the operating lever 33. Then, the two-way clutch X locks the rotation of the outer wheel 2 and the traveling wheel 31 in both the forward and reverse directions, and the wheelchair stops at that position.

FIGS. 10 and 11 show an embodiment in which the above-described two-way clutch X is provided with an operation member 16 for ON / OFF operation of the external force F. The operation member 16 is a ring-shaped member having a lever portion 16 a in a part in the circumferential direction, and is rotatably fitted to the outer peripheral surface of the axle 20. The lever 16a of the operating member 16 is connected to the cable 3 shown in FIG.
4 is connected to the operation lever 33. The inner ring 1 is fitted and fixed to the small-diameter portion slightly away from the step surface 20a between the small-diameter portion and the large-diameter portion of the axle 20, and the end face on the side where the retainer fixing groove 7 is provided has a step. It is arranged toward the side of the surface 20a. The operating member 16 includes the inner ring 1 and the step surface 20a.
Interposed between

The operating member 16 has a flange-shaped ring portion 16b located on the outer peripheral side of the retainer 4, and this ring portion 16b
An operation cam surface 17 for applying a radial force acting as an external force F to the retainer 4 with the rotation of the operation member 16 is provided at a plurality of places (four places in the figure) in the circumferential direction of the inner peripheral surface. . The operation cam surface 17 is formed as a straight line that is a chord of a part of a circle that forms the inner peripheral surface of the ring portion 16b. In addition, a plurality of operation cam surfaces 18 respectively contacting these operation cam surfaces 17.
Is formed on the outer peripheral surface of the retainer 4 by a projection having an arc-shaped cross section.

The operation member 16 is set at a predetermined angle (45 in the illustrated example) from the normal mode (both forward and reverse locking) shown in FIG.
When rotated, the operation cam surfaces 17 and 18 are engaged with each other, and a radial external force F that elastically deforms the retainer 4 toward the inner diameter side is applied to the retainer 4 from the operation member 16. As a result, the engaging projections 9 of the retainer 4 are intimately engaged with the retainer fixing grooves 7 of the inner ring 1, and the retainer 4 is held at the neutral position, and the operation mode shown in FIG. )become. When the operation member 16 is returned to the state shown in FIG. 10, the external force F is eliminated, so that the retainer 4 is elastically restored to the original shape, and the engaging convex portion 9 of the retainer 4 and the retainer fixing groove 7 of the inner ring 1 are formed. Becomes the original loose meshing state, and the normal mode (forward / reverse bidirectional lock) shown in FIG. 9 is established.

The rotation operation of the operating member 16 is performed in conjunction with the operation of the operating lever 34, and the operating lever 34
8B, the operation member 16 rotates by a predetermined angle.
9 (free in both forward and reverse directions), and when no operation is performed, the operation member 16 returns to the position shown in FIG.
(In both forward and reverse directions). Therefore, when the caregiver grasps the operation lever 33 together with the handshake 30f, the two-way clutch X makes the rotation of the outer wheel 2 and the traveling wheel 31 in both the forward and reverse directions free, enabling the wheelchair to run freely. When the operating lever 33 is released, the two-way clutch X locks the rotation of the outer wheel 2 and the traveling wheel 31 in both the forward and reverse directions, and the wheelchair stops at that position.

In the above-described embodiment, the switching from the normal mode (both forward and reverse locking) to the operation mode (free in both forward and reverse directions) is performed by applying an external force F in the radial direction to the retainer 4. It is also possible to adopt a configuration in which the engaging projection of the retainer and the retainer fixing groove of the inner ring are engaged in the axial direction, and the external force F is applied to the retainer in the axial direction. Also in this configuration, when the external force F in the axial direction is not applied to the retainer, the engaging convex portion of the retainer and the retainer fixing groove of the inner ring are loosely meshed with each other, so that the relative range of the predetermined range in the rotational direction of the retainer is reduced. When movement is permitted and an external axial force F is applied to the cage,
The engaging projection of the retainer and the retainer fixing groove of the inner ring are closely meshed with each other to retain the retainer at the neutral position. However, in this configuration, the mode can be switched by axially moving the cage relative to the inner ring by ON / OFF of the axial external force F, so that the elastic deformation of the cage due to the external force F is not necessarily required. It is not necessary, so that in this configuration it is not essential that the retainer be made of an elastically deformable material. In addition, to improve the responsiveness of switching from the operation mode (both forward and reverse free) to the continuous mode (forward and reverse bidirectional lock), the axial position of the cage is returned to the original position when the axial external force F is removed. Means may be provided. The return means only needs to apply an external force in the direction opposite to the axial external force F to the retainer, and can be formed of, for example, an elastic body such as a spring. Further, an operation member for ON / OFF operation of the axial external force F may be provided according to the configuration shown in FIGS. 10 and 11. In this case, the operation cam surface is provided on the end faces of the retainer and the operation member that face each other in the axial direction.

In the above-described embodiment, a roller is used as the engaging element, but a ball may be used. Further, the cam surface may be provided on the outer ring, and the circumferential surface may be provided on the inner ring. Furthermore, the cam ring or the circumferential surface as the clutch element and the ball raceway as the rolling bearing element may be formed directly on the outer peripheral surface of the axle without the inner ring. Also, a non-circular engaging element such as a sprag can be used as the engaging element. In this case, both forward and reverse cam surfaces are formed on the engaging element, and a circumferential surface is provided on both the outer ring, the inner ring, and the axle.

The present invention can be similarly applied to a stroller, a hand-held carrier, and the like, in addition to a manual wheelchair.

[0034]

According to the present invention, the free running of the traveling vehicle and the stop at an arbitrary position can be easily switched by operating and releasing the operation lever. For example, the operator inadvertently releases his / her hand from the handshake. In this case, the traveling vehicle automatically stops at that position, so that the convenience of this type of traveling vehicle can be improved. In particular, when the present invention is applied to a manual wheelchair,
It greatly contributes to improving safety and reliability.

Further, by providing rolling bearing means between the running wheel and the axle in parallel with the two-way clutch mechanism, smooth running is enabled, and the clutch outer ring of the two-way clutch mechanism and the bearing of the rolling bearing means are provided. By also using the outer ring, the structure can be simplified, compacted, lightened, and reduced in cost.

[Brief description of the drawings]

FIG. 1 is a side view conceptually showing a manual wheelchair of an embodiment.

FIG. 2 is a cross-sectional view of a two-way clutch mechanism.

FIG. 3 is a vertical sectional view taken along a line II in FIG. 2;

FIG. 4 is a perspective view of an inner race.

FIG. 5 is an enlarged sectional view showing various examples of a cam surface of an inner race.

FIG. 6 is a perspective view of a retainer.

FIG. 7 is a perspective view when an elastic body is attached to the retainer.

FIG. 8 is an operation explanatory view.

FIG. 9 is an operation explanatory view.

FIG. 10 is a cutaway view showing another embodiment of the two-way clutch mechanism.

11 is a longitudinal sectional view in FIG.

[Explanation of symbols]

 Reference Signs List 1 inner ring 2 outer ring 2a circumferential surface 3 roller 4 retainer 5 elastic body 6 cam surface 7 retainer fixing groove 9 engaging convex portion 12 locking means 13 unlocking means 14 positioning means 30 wheelchair body 30a body frame 30f handshake 31 running wheel 33 Operation lever 34 Cable wire

Claims (11)

[Claims] 1. A main body on which an object to be conveyed is mounted, an operation lever provided on the main body, an axle supported by the main body, a traveling wheel rotatably supported by the axle, the axle and the traveling wheel A locking means for locking the rotation of the traveling wheel with respect to the axle in both forward and reverse directions, and releasing the locking state of the locking means in conjunction with the operation of the operation lever. A manual release vehicle having a two-way clutch mechanism having: a lock release means for freeing rotation in both forward and reverse directions with respect to the axle. 2. The locking means of the two-way clutch mechanism is formed by an outer wheel fixed to the traveling wheel, the axle or an inner wheel fixed thereto, and an engaging element interposed therebetween. The lock release means is provided with a retainer for controlling the position or orientation of the engaging element in the rotational direction, and the position of the retainer in the rotational direction is interlocked with the operation of the operation lever. The manual traveling vehicle according to claim 1, further comprising: positioning means for holding the engagement element at a neutral position where the engagement element separates from the wedges in both the forward and reverse directions. 3. The wedge in both the forward and reverse directions includes a circumferential surface provided on one of the outer ring and the axle or the inner ring, a cam surface provided on the other, and the circumferential surface and the cam. 3. The manual traveling vehicle according to claim 2, wherein the engaging member is formed of a circular cross-section engaging member interposed between the engaging surface and the engaging surface, and the engaging member is separated from the wedges in both the forward and reverse directions when the engaging member is located at the separated position of the cam surface. . 4. The cam surface is deep at the center in the rotation direction,
4. A shape having a shape that becomes gradually shallower toward both sides, and at a central portion where the disengagement position is formed, an interval between the outer peripheral surface and the circumferential surface causes a slight clearance with respect to a diameter of the engaging element. The manual traveling vehicle described. 5. The positioning means is a concave / convex engaging portion provided between one of the outer ring, the axle or the inner ring, and the retainer, and the concave / convex engaging portion is When the operation levers are not operated, they are loosely meshed with each other to allow a relative movement within a predetermined range in the rotation direction of the retainer, and are interlocked closely with each other in conjunction with the operation of the operation lever to move the retainer to the neutral position. The manual traveling vehicle according to claim 2, wherein the vehicle is held. 6. The manual traveling vehicle according to claim 2, wherein an elastic body that generates a predetermined frictional force is interposed between one of the outer ring, the axle, and the inner ring, and the retainer. 7. The manual traveling vehicle according to claim 1, wherein the operation lever is provided near a handshake provided on the main body. 8. The manual traveling vehicle according to claim 7, wherein said operation lever and said unlocking means of said two-way clutch mechanism are connected by a cable wire. 9. The sliding door support structure according to claim 1, wherein a rolling bearing means is provided between said traveling wheel and said axle in parallel with said two-way clutch mechanism. 10. An outer ring serving as a clutch outer ring of the two-way clutch mechanism and a bearing outer ring of the rolling bearing means,
The manual traveling vehicle according to claim 9, which is fixed to the axle. 11. A chair body on which a seated person is placed, a handshake extending from a body frame of the chair body, an operation lever provided near the handshake, an axle supported by the body frame, A traveling wheel rotatably supported on the axle; a locking means provided between the axle and the traveling wheel for always locking forward and reverse rotation of the traveling wheel with respect to the axle; and A two-way clutch mechanism having a lock releasing means for releasing the locked state of the locking means in conjunction with the operation and making the forward and reverse rotation of the traveling wheel with respect to the axle free; A manually traveling vehicle having a cable wire for connecting to a lock release means of a clutch mechanism.