JP3446484B2 - Electric wheelchair - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wheelchair having an improved structure for attaching a shaft pin for attaching a seat frame of an electric wheelchair to a vehicle body frame.

[0002]

2. Description of the Related Art In the seat of an electric wheelchair, there has been no mechanism for attaching and detaching the seat and the vehicle body and opening and closing the vehicle body. There was something. In the wheelchair shown in FIG. 7, the seat frame b is placed on the vehicle body frame a. In this case, the upper end a1 of the vehicle body frame has a cylindrical opening, and the pipe-shaped seat leg b1 of the seat frame b is formed.
The seat frame b is supported by fitting the lower end into the upper end a1 of the body frame a, and the seat frame b can be removed from the body frame a by pulling up the seat frame b.

A seat d is connected to one end of the seat frame b via a hinge c, and a clamp e composed of a lever and a ring at the other end can be hooked on a hooked portion f of the seat d. The clamp e locks the locked portion f to prohibit the rotation of the seat d and fixes the seat d to the seat frame b. Further, by opening the clamp e, the seat d is moved to the center c1 of the hinge c.
It is rotatable about the center of rotation.

In the conventional electric wheelchair described above, the opening / closing mechanism of the seat d and the attachment / detachment mechanism have different structures, and the two mechanisms have to be provided separately, so that the structure tends to be complicated.

On the other hand, a comparative example shown in FIG. 8 can be considered as a mechanism having both of the above two mechanisms. In this comparative example, a U-shaped bracket g that opens upward is fixed to the upper surface of the vehicle body frame a. Then, by inserting the pin h into the hole g1 provided in the bracket g and the hole b2 provided in the seat leg b1, the seat frame b can be rotated with respect to the vehicle body frame a with the pin h as a rotation axis. I am trying. Also, the pin h has a flange h at one end.
1 is projected in the radial direction, and a hole h2 for inserting the clip j is formed in the other end. Accordingly, when the clip j is inserted, the pin h is prevented from coming off from the bracket g and the seat leg hole b2, and the function as a rotation axis is ensured, and when the clip j is removed, the pin h easily comes off. The frame b is easily attached and detached.

A rubber cap i is fixed to the lower end surface portion of the seat leg b1 so as to cushion the bracket g and the seat leg b1. In addition, a stopper rubber k for cushioning is also provided on the tilting surface side of the seat leg b1, and serves as a stopper for cushioning and stopping when the seat frame b pivots on the pin h and strikes the vehicle body frame a. Has become.

[0007]

In the prior art shown in FIG. 7, since the seat opening / closing hinge c and the seat attaching / detaching mechanism are separately provided, the mechanism is complicated and the cost is increased. Further, in the comparative example of FIG. 8, when the sheet d is removed, the clip j is removed and the pin h is pulled out, but the clip j may fly or may be lost because the clip j is small, which is inconvenient to handle. There is.

The present invention has been made to solve the above problems, and the mechanism is simple and the cost can be reduced, and it is convenient because there is no trouble in handling such as loss of parts, and the appearance quality is good. It is also aimed to provide an improved electric wheelchair.

[0009]

The invention according to claim 1 is an electric wheelchair in which a seat frame for mounting a seat is detachably mounted on a vehicle body and can be opened and closed.
A front end leg that extends downward is provided at the front end, and this front end leg
The lower end is attached to the bracket provided on the front of the vehicle body through the shaft pin.
The front end leg part is supported while being supported rotatably in the front-rear direction.
Cover the bottom with an elastic cap,
The upper While Ru is provided a buffer portion which abuts against the vehicle body when opened relative to the vehicle body is rotated forward the seat frame by a shaft pin to the shaft, at the bottom of the cap, the Jikupi
The electric wheelchair is characterized in that it is provided with a holding portion that covers the front side from both sides and prevents the wheel from falling off .

According to a second aspect of the invention, the cap has a lower end.
Penetrated Then co slit extending upward in the longitudinal direction from the
The electric wheelchair according to claim 1 , wherein the left and right holding portions divided by the slit hold the shaft pin.

According to the first aspect of the present invention, since the leg portion of the seat frame is engaged with the vehicle body through the shaft pin, the seat frame can be rotated with respect to the shaft pin, and the seat can be rotated as desired. Can be opened and closed. At the same time, since the cap that covers the shaft pin and holds the shaft pin is disposed on the leg portion, the shaft pin can be detached and mounted only by removing the cover of the cap. Therefore, there is no risk of parts being lost as when a clip is used to hold the shaft pin, and the handling is easy and convenient, which is convenient. Further, the cap is provided with a cushioning portion that comes into contact with the vehicle body when the seat frame is rotated about the axle pin and opened with respect to the vehicle body. It is possible to provide a portion, and it does not take time and effort to attach the buffer portion, unlike when a buffer portion is provided separately.

According to the second aspect of the invention, since the cap is formed of the elastic body as well as forming the slit, the cap can be easily opened at the slit portion. In addition, since the shaft pin is held by the holding portion divided by the slit, when the shaft pin is held by the cap, the slit can be easily opened and the shaft pin can be easily attached and held. Further, when the seat frame rotates about the shaft pin, the slit does not open and the cap does not interfere with the rotation.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating the overall configuration of an electric wheelchair 10 according to an embodiment, and FIGS. 2A to 2E.
3 is an explanatory view of the cap 20, FIG. 3 is a vertical cross-sectional side view showing the state in which the cap 20 is attached, FIG. 4 is an explanatory view of the attachment of the cap 20 taken along line IV-IV of FIG. 3, and FIG. FIG. 6 is an explanatory view of the operation state of the cap 20, and FIG.

As shown in FIG. 1, an electric wheelchair 10 includes a seat frame 14 having a seat 12 on which an occupant sits.
Is attached to the vehicle body 16 so as to be detachable and openable and closable. Legs 14 extending downward at the front end of the seat frame 14
L1 is engaged with the vehicle body 16 via the shaft pin 18,
Cap 2 that covers the shaft pin 18 and holds the shaft pin 18
0 is arranged on the leg portion 14L1, and the cap 20 is attached to
As shown in FIG. 1, when the seat frame 14 is rotated about the shaft pin 18 and is opened with respect to the vehicle body 16,
A cushion portion (buffer portion) 22 that abuts against is provided.

That is, the seat frame 14 is mainly made of a pipe material extending in the front-rear direction in a side view. A seat leg portion (seat leg) 14L1 extends downward at the front end and a seat leg at the rear end. The portion 14L2 extends downward and upward and is fixed.

An armrest 24 is detachably provided on the upper portion of the seat frame 14, and a backrest 26 is provided on the leg portion 14L2 at the rear end of the seat frame 14 so as to face upward. A steering switch (steering switch lever) 28 for advancing / retreating / steering the wheelchair is provided at the front of the armrest 24.

As shown in FIGS. 1 to 4, the armrest 2
Reference numeral 4 denotes a pipe material having an L-shape with a general front downward bend, and a front end portion 24F facing downward is fitted and mounted in an open upper end portion of a leg portion 14L1 at the front end of the seat frame 14. The rear end portion 24R facing rearward is engaged with the upper portion of the seat frame rear end leg portion 14L2.
In addition, the lower end portion of the retractable leg portion 14L2 has a smooth semicircular shape, and the rear end leg portion 14 is provided on the upper surface portion of the vehicle body 16.
A cushion material that absorbs shock when L2 abuts can be attached.

The vehicle body 16 has a frame structure formed of a die member or a pipe material having a rectangular cross section. The battery 30 is suspended and fixed to the lower portion, and the front wheel casters 32 and the footrests 34 are supported and fixed at the front portion and the rear portion. Supports and fixes the drive motor 36 and the rear wheel 38. Further, a bracket 40 protruding upward is fixed to an upper surface portion of a front end portion of the vehicle body 16, and a hole 40a for inserting the shaft pin 18 opened in the vehicle body width direction of the bracket 40 is formed ( (See FIGS. 3 and 4).

The front end leg portion 14L1 of the seat frame 14 is engaged with the vehicle body 16 via the shaft pin 18. As shown in detail in FIGS. 3 and 4, two holes 42 and 44 are vertically formed in the lower portion of the front end leg portion 14L1. A screw 46 is screwed into the upper hole 42 to position the lower end of the armrest 24 fitted in the front end leg portion 14L1. Further, a cutout slit 50 penetrating in the front-rear direction and opening downward is formed in the lower end portion of the front end leg portion 14L1, and the lower hole 44 is formed in a direction traversing the slit. Then, with the bracket 40 fitted in the notch slit 50, the shaft pin 18 is inserted into the lower hole 44 and the hole 40a of the bracket to engage the front end leg portion 14L1 with the vehicle body 16. The shaft pin 18 has a flange 18a formed at one end, and the hole 44
I try not to dive into. In addition, the front end leg portion 1
A reinforcing pipe member 51 is integrally fitted and fixed to the inner peripheral surface of 4L1, and a hole 44 and a slit 50 are formed.

The cap 20 has a slit 20 at the bottom.
S is formed and is made of an elastic body such as rubber, and the lower portion divided by the slit 20S is a holding portion 20H, and the elasticity of the inserted axial pin 18 restricts the movement from both sides in the axial direction. And hold it.

Further, as shown in detail in FIG. 2, the cap 20 has a hole 20a formed at a position corresponding to the upper hole 42, and the holding portion 20H corresponds to the lower hole 44. The portion 20b to be expanded bulges outward in the shape of a rectangular hollow dome. When the cap 20 is arranged so as to cover the front end leg portion 14L1, a cap 20 in which the shaft pin 18 is in the vehicle body engaging state through the bracket hole 40a from the hole 44 is provided from both ends of the shaft of the shaft pin 18. The engagement state is maintained by fitting and pressing in the plate-like portion 20b.

Further, the cushion portion 22 on the upper portion of the cap 20 is bulged in a solid trapezoidal shape toward the front when viewed in a mounted state on the front end leg portion 14L1. Further, the slit 20S of the cap 20 is cut out at two front and rear positions, and the upper end of the front slit 20S extends near the lower edge of the cushion portion 22.

When the seat 12 is removed, since the slit 20S of the holding portion 20H at the lower portion of the cap 20 is provided, the holding portion 20H covering the shaft pin 18 can be easily rolled up. The shaft pin 18 can be pulled out by separating the holding portion from the periphery of 18. Therefore, the seat frame 14 can be easily removed from the vehicle body 16.

When mounting the seat 12,
The seat frame 14 is placed on the vehicle body, and the bracket 40 is attached to the notch slit 5 of the front leg portion 14L1 of the seat frame 14.
Then, the lower part of the cap is rolled up, and the shaft pin 18 is inserted and attached to the hole 44 and the hole 40a of the bracket. Then, by covering the periphery of the shaft pin 18 with the lower portion 20H of the cap 20, the shaft pin 18 can be reliably prevented from coming off.

In the state where the shaft pin 18 is fitted as described above, the seat frame 14 is rotated forward as shown in FIGS. 5 and 6, and the upper surface of the battery 30 is looked into for maintenance or the like. Can be done. At that time, the cushion portion 22 comes into contact with the upper surface of the vehicle body 16 to cushion it.

According to the above-described embodiment, the front leg portion 14L1 of the seat frame 14 is connected to the vehicle body 1 via the shaft pin 18.
6, the seat frame 14 can be rotated with respect to the shaft pin 18, and the seat 12 can be opened and closed as desired.

At the same time, since the cap 20 that covers the shaft pin 18 and holds the shaft pin 18 is disposed on the front end leg portion 14L1, the shaft pin 18 can be removed simply by turning up the holding portion 20H of the cap 20. Therefore, there is no risk of parts being lost when a clip is used to hold the shaft pin 18, and the handling is easy and convenient, which is convenient.

Further, since the cap 20 is provided with the cushion portion 20 which comes into contact with the vehicle body 16 when the seat frame 14 is rotated about the shaft pin 18 and opened with respect to the vehicle body 16, The cap 20 to the leg portion 14L1
The cushion portion 20 can be provided as it is by attaching it to, and there is no need to attach the cushion portion 20 unlike the case where a cushioning portion is provided separately.

Further, since the cap 20 has slits 20S formed in the front and rear and is made of an elastic material, the cap 2
With 0, the holding portion 20H having the slit 20S can be easily flipped upward and easily opened. At the same time, the shaft pin 18 is held by the holding portion 20H divided by the slit 20S.
Since the cap 20 holds the shaft pin 18, the slit 20S can be easily opened when the shaft pin 18 is held by the cap 20, and the shaft pin 1 can be easily mounted.
8 can be attached and held. Further, when the seat frame 14 rotates about the shaft pin 18, the bracket 40 passes between the slits 20S and the slits 20S open as needed, so that the cap 20 rotates without resistance.
Does not interfere with the rotation.

[0030]

According to the first aspect of the invention, the seat frame can be rotated with respect to the shaft pin, the seat can be opened and closed as desired, and the cap that covers the shaft pin and holds the shaft pin is provided. Since it is arranged on the legs, the shaft pin can be removed and mounted simply by removing the cover of the cap. Therefore, there is no risk of parts being lost as when a clip is used to hold the shaft pin, and the handling is easy and convenient, which is convenient.

Further, since the cap is provided with a buffer portion which comes into contact with the vehicle body when the seat frame is rotated about the shaft pin as an axis and opened with respect to the vehicle body, the cap can be attached to the leg portion. For example, the shock-absorbing part can be provided as it is, and it does not take time and effort to install the shock-absorbing part as in the case of separately providing the shock-absorbing part.

According to the second aspect of the invention, since the cap is formed of the elastic body as well as forming the slit, the cap is easy to open at the slit portion. In addition, since the shaft pin is held by the holding portion divided by the slit, when the shaft pin is held by the cap, the slit can be easily opened and the shaft pin can be easily attached and held. Further, when the seat frame rotates about the shaft pin, the slit does not open and the cap does not interfere with the rotation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an overall configuration of an electric wheelchair according to an embodiment.

FIG. 2 is an explanatory view of a cap, (a) is a front view,
(B) is a side view, (c) is a sectional view taken along the line CC of (b), (d) is a bottom view, and (e) is a perspective view.

FIG. 3 is a vertical cross-sectional view of a seat frame front end leg portion to which a cap is attached.

4 (a) is an explanatory view of mounting the cap taken along line IV-IV in FIG. 3, (b) is a cross-sectional view taken along line BB in (a), FIG.
(C) is a perspective view of a main part of a leg portion.

FIG. 5 is an explanatory view of a rotating state of a seat frame.

6A and 6B are explanatory views of the operation of the seat frame and the cap, in which FIG. 6A is an explanatory view of a leg portion in an upright state, and FIG.

FIG. 7 is an explanatory view of a seat rotating structure of a conventional electric wheelchair.

FIG. 8 is an explanatory view of a seat rotating structure of a comparative example.

[Explanation of symbols]

10 Electric wheelchair 14 seat frame 14L1 Front leg of seat frame 16 car body 18 axis pin 18a flange 20 cap 20a hole 20b bulge 20S slit 20H holding part 22 Cushion 40 bracket 40 bracket holes 44 holes 46 screw 50 Notch slit on the front leg of the seat frame

Claims (2)

(57) [Claims] 1. An electric wheelchair in which a seat frame on which a seat is mounted is detachably attached to a vehicle body and can be opened and closed, and a front end leg portion extending downward is provided at a front end portion of the seat frame.
The bracket with the lower end of the front end leg is provided at the front of the vehicle.
The front end leg is covered with an elastic cap while being supported rotatably in the front-rear direction via a shaft pin.
There, the top of the cap, while the Ru provided a buffer portion which abuts against the vehicle body when opened relative to the vehicle body is rotated forward the seat frame by a shaft pin to the shaft, the cap
The lower part covers the shaft pin from both sides to prevent it from falling off.
An electric wheelchair having a holding part . 2. A cap and characterized in that the <br/> slit extending from its lower end upwardly in the longitudinal direction pierced Then co, the holding of the shaft pin holding portions of the left and right divided by the slit The electric wheelchair according to claim 1.