JPH0984833A - Wheel chair for racing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight by arranging an axle in a hub of a front wheel for steering made up of a cylindrical axle body and a support axle which is arranged rotatable sticking out of both ends of the shaft body to be supported by a fork. SOLUTION: An axle 23 comprising an axle body 24 and a support axle 27 is arranged within a hub 22 of a front wheel 21 for steering. The axle body 24 is made cylindrical to rotate freely on an inner circumferential surface of the hub 22 and a through hole 25 is formed on the axle body 24 to insert and fit the support axle 27 thereinto. The through hole 25 is opened on the lower part side in a left end face 24a of the axle body 24 and opened on the upper part side in a right end face 24b and an axle center 02 is inclined by an angle αto the axle center 01 of the axle body 24. The support axle 27 to be inserted and fitted into the through hole 25 of the axle body 24 is made long enough to stick out of both ends of the axle body 24 and a male thread is tapped at both ends sticking. The axle body 24 is inserted and fitted into the hub 22 in a state where the support axle 27 is inserted and fitted into the through hole 25 of the axle body 24 and the nut is screwed down on the male thread at both the ends. A steering lever 34 is grasped between the right nuts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a race wheelchair competing for time, and more particularly to a race wheelchair suitable for a counterclockwise track race.

[0002]

2. Description of the Related Art In a conventional racing wheelchair C0, as shown in FIG. 8, a pair of drive wheels 3 are supported on the rear side of a base frame 1 and one steering wheel is mounted on the front side of the base frame 1. The front wheels 7 of the were disposed. 2 is a seat frame. The front wheel 7 for steering is rotatably pierced through the hub 7a, and both ends of an axle thereof are supported by a forked hawk 5. The forked hawk 5 has its upper portion connected to project upward.
It was equipped with a book steering shaft 5a. The steering shaft 5a was rotatably held by the head pipe 4 fixed to the front end of the base frame 1. Also, Hawk 5
A handle 6 protruding in the left-right direction was fixed to the upper part of the.

In this racing wheelchair C0, the handle 6
The front wheel 7 for steering is directed in the left and right predetermined directions by
By rotating the drive wheels 3, the front wheels 7 for steering are bent.

[0004]

However, in the conventional racing wheelchair C0, the mechanism for steering the front steering wheel 7 has the steering shaft 5a of the hawk 5 rotatably arranged in the head pipe 4 and the steering wheel 5a. 6 is a mechanism for rotating the steering shaft 5a around the head pipe 4 for steering, and since the steering shaft 5a also receives the load acting on the front wheels 7, the steering shaft 5a is attached to the steering shaft 5a. Since the strength is required and the head pipe 4 also needs a certain length and strength, the weight of the wheelchair C0 is to be increased.

Such an increase in weight is not preferable for a racing wheelchair C0 that competes for time.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a racing wheelchair capable of reducing the weight.

[0007]

A racing wheelchair according to the present invention is a racing wheelchair that travels counterclockwise on a track, the steering wheel having both ends supported by a forked hawk fixed to a frame. The axle in the hub of the front wheel is a cylindrical shaft body that is rotatably disposed on the inner peripheral surface of the hub, and is rotatably disposed so as to project from both ends of the shaft body. A support shaft supported by the shaft main body, and a through hole for disposing the support shaft provided in the shaft main body is opened to the lower side on the left end surface of the shaft main body, On the right end face, it penetrates so as to open to the upper side,
Rotate the steering lever connected and fixed to the shaft body,
By rotating the shaft main body, the support shaft end on the left end face side of the shaft main body is arranged in front of the shaft center of the shaft main body, and the support shaft end on the right end face side of the shaft main body is rotated by the shaft. It is characterized in that it is arranged on the rear side of the axis of the main body so that the steering front wheel can be steered leftward.

In the fork supporting both ends of the support shaft, the support portion of the left arm supporting the left end of the support shaft is set to be closer to the shaft center of the shaft main body than the support portion of the right arm supporting the right end of the support shaft. It is desirable to dispose at a lower position at an angle substantially equal to the inclination angle of the axis of the through hole with respect to.

The steering lever is connected via a connecting rod.
It is desirable to connect to an operation lever that is swingably arranged on the frame.

The left and right directions in this specification refer to the left and right directions in the forward direction of the racing wheelchair.

[0011]

In the race wheelchair according to the present invention, the steering lever is operated to dispose the support shaft end portion on the left end face side of the shaft body on the front side of the shaft center of the shaft body, and the right end face of the shaft body. By arranging the side support shaft end portion on the rear side of the shaft center of the shaft body, the front steering wheel can be steered leftward.

In the racing wheelchair according to the present invention, the axle in the hub of the steering front wheel is merely double-structured, and in addition, a steering lever or the like for rotating the axle body of the axle is used. A mechanism for steering can be configured only by providing the steering lever, etc., because the steering lever and the like do not need the strength to receive the load acting on the front wheel for steering, and the axle in the hub can be almost the same weight as the conventional one. The weight can be reduced.

Further, in the fork supporting both ends of the support shaft, the support portion of the left arm supporting the left end of the support shaft is
When the steering wheel is placed in a lower position at an angle substantially equal to the inclination angle of the shaft center of the through hole with respect to the shaft center of the shaft body, the steering front wheel is in a straight traveling state from the support portion of the right arm supporting the right end of the support shaft. In this case, the front steering wheel can be made substantially upright with respect to the ground, and can be tilted to the left when the vehicle is steered leftward, so that good running stability can be obtained.

Further, if the steering lever is connected via a connecting rod to an operating lever swingably arranged on the frame, the operation of the steering lever can be performed by swinging the operating lever. Since the operation lever can be arranged at a position close to the occupant, the steering operation is facilitated. By the way, even if connecting rods and operating levers are added, these members do not receive the load acting on the front wheels and do not require the strength to support the weight, so the effect of reducing the weight of the wheelchair is significantly reduced. is not.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The race wheelchair C1 of the embodiment is shown in FIG.
As shown in FIG. 2, a pair of drive wheels 13 are provided on the rear side of the base frame 11 and the seat frame 12
Are connected and fixed. The pair of drive wheels 13 has an axle 14 which is rotatably inserted in each hub and is supported by the base frame 11, and an upper side thereof is covered with a cover 15 fixed to the seat frame 12. Further, a hawk 17 supporting the front steering wheel 21 is connected and fixed to the front side of the base frame 11.

As shown in FIGS. 1, 2, 4, and 6, the hawk 17 is composed of a left arm 18 and a right arm 19 whose rear ends are fixed near the front end of the head frame 11, respectively. Support holes 18a and 19a are formed at the front ends of the arms 18 and 19 to support the support shaft 27, which will be described later. Then, as shown in FIGS. 6 and 7, the support hole 18a of the left arm 18 has a through hole 25 with respect to the axis O1 of the shaft body 24, which will be described later, from the support hole 19a of the right arm.
An angle β (3 °) equal to the inclination angle α of the axis O2 of
It is placed down from the horizontal.

In the hub 22 of the front wheel 21 for steering, as shown in FIG.
As shown in 4.6, an axle 23 including a shaft body 24 and a support shaft 27 is arranged. The shaft body 24 is the hub 22.
The shaft main body 24 has a through hole 25 into which the support shaft 27 is inserted. Since a ball bearing (not shown) is arranged on the inner peripheral surface of the hub 22, the shaft main body 24 is rotatable in the hub 22. Also, the front wheels 21
The hub 22 is connected to ribs 21a on which tires are arranged via a large number of radially extending spokes (not shown).

The through hole 25 of the shaft main body 24 is opened so that the left end face 24a of the shaft main body 24 is open to the lower side and the right end face 24b of the shaft main body 24 is opened to the upper side. The center O2 is inclined with respect to the axis O1 of the shaft body 24 by an angle α (3 ° in the case of the embodiment). Further, male screws 26 are threaded on the outer circumference of both ends of the shaft body 24.

The support shaft 27 fitted into the through hole 25 of the shaft body 24 has a length protruding from both ends of the shaft body 24.
Male screws 28 are threaded on both the protruding ends.

Then, with the support shaft 27 fitted in the through hole 25 of the shaft body 24, the shaft body 24 is fitted in the hub 22, and the male screws 26 at both ends have two nuts 29.
29 is screwed together, and the steering lever 34 is sandwiched between the nuts 29 on the right side. Further, the nut 30 is screwed into the male screws 28 at both ends of the support shaft 27 with the washer 31 interposed, and both ends of the support shaft 27 are fitted into the support holes 18a, 19a of the left and right arms 18, 19 of the hawk 17. The front wheel 21 is rotatably supported by the hawk 17 by being inserted and screwing the cap nut 32 into the male screws 28 at both ends of the support shaft 27.

The lower end of the steering lever 34 is fixed to the right end portion of the shaft body 24 by the nuts 29, 29, and the upper end is pivotally attached to the front end of the connecting rod 35. The rear end of the connecting rod 35 is pivotally attached to the forked bracket 38 of the operating lever 36.

The operating lever 36 is composed of a forked bracket 38 which is axially attached to the base frame 11 across the base frame 11, and a T-shaped grip portion 37 which projects upward from the forked bracket 38. Also bracket 38
At the front and rear edges, there are formed extended portions 38a into which bolts 39 and 40 are respectively screwed.

The amount of protrusion of the bolts 39 and 40 downward from the extending portion 38a is such that the operation lever 36 is tilted in the front-rear direction and the lower ends of the bolts 39 and 40 are moved to the base frame 11
When brought into contact with the stoppers 41 fixed to the respective shafts, the openings of the through holes 25 on the left end face 24a side of the shaft body 24 are arranged at the lower position and the front position via the connecting rod 35 and the steering lever 34. The amount of protrusion.

Explaining the mode of use of the racing wheelchair C1 of the embodiment, if the grip 37 of the operating lever 36 is pulled rearward and the lower end of the bolt 40 is brought into contact with the stopper 41, steering will be performed via the connecting rod 35. The lever 34 moves backward 90
The rotary shaft is rotated, and as shown in FIGS. 5 and 7, the support shaft end portion 27a on the left end surface 24a side of the shaft body 24 is rotated from the state of FIGS.
Is arranged on the front side of the axis O1 of the shaft body 24, and the shaft body 2
By disposing the support shaft end portion 27b on the right end surface 24b side of No. 4 on the rear side of the shaft center O1 of the shaft body 24, the steering front wheel 21 can be steered leftward by 3 °.

In the race wheelchair C1 of the embodiment, the axle 23 in the hub 22 of the front wheel 21 for steering is simply made to have a double structure, and the other is for rotating the axle body 24 of the axle 23. A steering mechanism can be configured only by providing the steering lever 34 and the like, and the steering lever 34 and the like do not need strength to receive the load acting on the front wheel 21 for steering, and
Since the weight of the axle 23 in the hub 22 is almost the same as the conventional weight, the weight can be reduced. Incidentally, while the conventional racing wheelchair C0 weighed 8 kg, the racing wheelchair C1 of the embodiment was able to reduce the weight to 7 kg.

Further, in the racing wheelchair C1 of the embodiment, in the forks 17 supporting both ends of the support shaft 27,
The support portion 18a of the left arm 18 that supports the left end portion 27a of the support shaft 27 is formed from the support portion 19a of the right arm 19 that supports the right end portion 27b of the support shaft 27 to the through hole 25 for the axis O1 of the shaft body 24. It is arranged at a lower position with an angle β equal to the inclination angle α of the axis O2. Therefore, when the steering front wheels 21 are in the straight traveling state, as shown in FIG. 6, the steering front wheels 21 stand upright with respect to the ground, and when the steering wheels 21 are turned leftward, as shown in FIG. Since the vehicle can also be tilted to the left by 3 °, good running stability can be obtained.

Further, in the racing wheelchair C1 of the embodiment, the steering lever 34 is provided with the operating lever 36 which is swingably disposed on the base frame 11 via the connecting rod 35.
It is connected to. Therefore, since the operation of the steering lever 34 can be performed by swinging the operation lever 36, and the operation lever 36 can be arranged at a position close to the occupant, the steering operation is facilitated.

In the race wheelchair C1 according to the embodiment, the axis O of the through hole 25 with respect to the axis O1 of the shaft body 24 is used.
Although the case where the inclination angle α of 2 is 3 ° is shown, it goes without saying that the inclination angle α may be arbitrarily set in correspondence with the race.

The swing angle of the operating lever 36, that is, the rotation angle of the steering lever 34 may be arbitrarily set according to the steering angle of the wheelchair C1.

[Brief description of drawings]

FIG. 1 is a side view of a racing wheelchair showing an embodiment of the present invention.

FIG. 2 is a plan view of the same embodiment.

FIG. 3 is an exploded perspective view of a shaft body and a support shaft of the same embodiment.

FIG. 4 is a plan view of the steering front wheel of the embodiment in a straight traveling state at a hub portion.

FIG. 5 is a plan view of a front wheel for steering of the embodiment in a leftward state at a hub portion.

FIG. 6 is a front view of the steering front wheel of the embodiment in a straight traveling state at a hub portion.

FIG. 7 is a front view of the hub portion of the front steering wheel in the same embodiment in a leftward direction.

FIG. 8 is a side view of a conventional racing wheelchair.

[Explanation of symbols]

 1.11 ... Base frame, 5.17 ... Hawk, 7.21 ... Steering front wheel, 18a. 19a ... (Supporting part) support hole, 22 ... Hub, 23 ... Axle, 24 ... Shaft body, 24a ... Left end surface, 24b ... right end surface, 25 ... through hole, 27 ... support shaft, 34 ... steering lever, 35 ... connecting rod, 36 ... operation lever, C0 / C1 ... racing wheelchair.

Claims (3)

[Claims] 1. A wheelchair for races traveling counterclockwise on a track, wherein an axle in a hub of a front wheel for steering whose both ends are supported by a forked fork fixed to a frame has an inner circumference of the hub. A cylindrical shaft main body rotatably disposed on the surface, and a support shaft rotatably disposed so as to project from both ends of the shaft main body and supported by the hawk. A through hole for arranging the support shaft provided in the shaft main body, the left end surface of the shaft main body is opened to a lower side, and the right end surface of the shaft main body is penetrated so as to be opened to an upper side, Rotate the steering lever connected and fixed to the shaft body,
By rotating the shaft main body, the support shaft end on the left end face side of the shaft main body is arranged in front of the shaft center of the shaft main body, and the support shaft end on the right end face side of the shaft main body is rotated by the shaft. A race wheelchair, characterized in that the front wheel for steering can be steered leftward by being arranged on the rear side of the axis of the main body. 2. A fork supporting both ends of the support shaft, wherein a support part of a left arm supporting a left end of the support shaft is more than a support part of a right arm supporting a right end of the support shaft. The race wheelchair according to claim 1, wherein the race wheelchair is arranged at a lower position at an angle substantially equal to an inclination angle of the axis of the through hole with respect to the axis. 3. The steering lever is connected to an operating lever, which is swingably disposed on the frame, via a connecting rod.
Wheelchair for racing as described.