JPH0137623Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the footrest of a wheelchair, and allows the footrest to be opened to the left and right with a small operating force without changing the posture much when riding.

(Prior art) The footrest of a wheelchair is rotated to the side of the front wheels when getting on and off, so that it does not interfere with getting on and off, and is placed at the front of the vehicle body when moving, so that it serves as a rest for the feet. . What is shown in FIGS. 1 to 3 is the conventional structure of this part. To explain this, 1 is a chassis frame, 2 is a front wheel supported at its front end, and 3 is a footrest.

A downwardly directed pipe 5 is attached to the upper end of the footrest holder 4 with the footrest 3 attached to the lower end, and is fitted into the pipe 6 of the chassis frame 1 so as to be rotatable and slidable in the vertical direction. I have let you. As shown in FIGS. 2 and 3, a stopper pipe 7 is projected forward from the chassis frame 1, and a footrest holder 4 is attached to the stopper pipe 7.
The stopper plate 8 on the side comes into contact with it. 9 is a stopper pin, and 10 is a stopper groove in which this stopper pin 9 engages.

The conventional device having such a structure raises the footrest 3 together with the footrest holder 4 as shown in FIG. 2 from the running state shown in FIG.
With the stopper pin 9 removed from the stopper groove 10, the chassis frame 1 is rotated to the side as shown in FIG. 3, and then lowered to obtain the posture for getting on and off. In this case, it is difficult or impossible for a weak user to raise the footrest 3 together with the footrest holder 4 in order to remove the stopper pin 9 from the stopper groove 10.

What is shown in FIG. 4 was created to solve this problem. In this device, a lever 11 is provided at the upper end of the footrest holder 4.
By operating 1, the footrest holder 4
This means that the footrest 3 can be rotated to the side of the chassis frame 1 without raising the footrest 3. However, there are problems in that the operating force for the lever 11 becomes large or that the lever 11 is difficult to reach.

(Purpose of the invention) The present invention has been made in order to solve these problems of the prior art.
This can be easily done by operating a single lock lever.

(Structure of the invention) In order to achieve the above object, the present invention provides a hole in the chassis frame, a pin that fits into the hole on the footrest holder side, and a lock lever that controls the forward and backward movement of this pin. It is structured as follows. With this configuration, even a passenger with weak strength can easily swing out the footrest.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 5 to 8, in which the same members as those in FIGS. 1 to 3 are given the same reference numerals. A hole 13 is provided in the upper part of a pipe 12 that projects horizontally from the pipe 6. A lower portion of a piston pin 16 that is movable up and down by a case 14 and urged downward by a spring 15 is fitted into this hole 13 . 17 is a resin collar provided on the outside of the pipe 12, and 18 is a resin collar provided on the outside of the pipe 5, both of which serve to guard frictional parts.

A reinforcing plate 19 protruding from the footrest holder 4 is brought into contact with the resin collar 17. When the reinforcing plate 19 comes into contact with the resin collar 17, it acts as a stopper for inward rotation of the footrest 3. The above-mentioned case 14 is integrally attached to this reinforcing plate 19 so as to face upward, and its detailed structure will be described later. Case 14 has bracket 2
0 is provided integrally, and this bracket 20
A lock lever 21 is rotatably supported by a shaft 22. An arm 23 is integrally provided at the lower part of the lock lever 21. Arm 23
is provided with a long hole 24, into which a pin 25 provided perpendicularly to the upper end of the piston pin 16 is fitted. The above mechanism is as shown in FIG.
mounted on the part of the

What has been described above is an outline of the embodiment of the present invention. Here, the assembly structure of each part will be explained in more detail with reference to FIGS. 9 to 12. FIG. 9 shows the connection relationship between the case 14 and the lock lever 21 with respect to the footrest holder 4. To explain this, a reinforcing plate 19 is welded to protrude toward the pipe 5 from the illustrated portion of the footrest holder 4.
9 has a hole 2 into which a lock pin portion 28 (see FIG. 10) formed at the bottom of the piston pin 16 enters and exits.
9 and a screw hole 30 for attaching the case 14. The lower portion of the lock pin portion 28 is sloped on the side that will be inward when the footrest 3 is attached to the vehicle body, so that the lock is effective against forces toward the outside of the vehicle body, and the lock pin is effective against forces toward the inside of the vehicle body. The portion 28 is adapted to escape upward along the inclined surface.

As shown in FIG. 10, a flange plate 31 for attaching to the reinforcing plate 19 is fixed to the lower end of the case 14 by welding (or integrally formed with the case 14 by pressing). A hole 32 corresponding to the screw hole 30 of the reinforcing plate 19 is opened. The upper part of the flange plate 31 of the case 14 has a U-shaped cross section and is open downward, and this opening is opposed to the reinforcing plate 19. The case 14 having such a shape is combined with the reinforcing plate 19, and the piston pin 16 is housed inside the case 14, urged downward by the spring 15. 9 and 10, reference numeral 33 indicates a pin hole provided in the piston pin 16 in a direction perpendicular to the axial direction, and reference numeral 34 indicates a screw for attaching the case 14 to the reinforcing plate 19.

As mentioned above, brackets 20 are integrally attached to both sides of the case 14, and a lock lever 21 is rotatably supported on the bracket 20 by a shaft 22. To explain this part in more detail, the lock lever 21 rotates the bearing part 35 at the lower end to the bracket 20 of the case 14 around the shaft 22 by means of the shaft 22 (shaft screw), washer 36, and U nut 37. It is assembled so that it can move freely. Further, the pin 25 is inserted into the elongated hole 24 (see FIGS. 5 and 6) of the arm 23 provided in the bearing portion 35 so that the arm 23 straddles the upper end of the piston pin 16.
4, pin hole 33 of piston pin 16, arm 2
It passes through the elongated hole 24 of No. 3. As a result, the pin 25 is fixed to the piston pin 16, and the arm 2
The long hole 24 of No. 3 is in a loose state. With this structure, the lock lever 21 and the piston pin 16 are connected and interlocked (see FIG. 12).

In the electric wheelchair 26 configured in this way, when the passenger is seated on the seat 27, the lock lever 2
1 is rotated to the side of the vehicle body, the lower end of the piston pin 16, which had been fitted into the hole 13 until then, is pulled out from the hole 13 by the spring 15 as shown in FIG. 6, as shown in FIG. I will do it. This allows the footrest 3 to be opened outward together with the footrest holder 4. To move the footrest 3 in front of the front wheels 2 in order to bring the vehicle into a running state, the operation described above can be reversed.

Here, the operation will be explained in more detail. 11th
By tilting the lock lever 21 in the direction of the arrow in the figure, the piston pin 16 rises and the lock is released. If you let go of the lock lever 21 in this state, the piston pin 16 will be biased to the locked state by the elastic force of the spring 15, and the lock lever 21 will be forced into the locked state.
1 returns to its original position (see Figures 5 and 6). As shown in FIGS. 13 to 15, the direction in which the lock lever 21 is unlocked and the direction in which the footrest 3 is swung out are in the same direction (toward the outside of the vehicle body). When pushed, the piston pin 16 rises and is unlocked from the vehicle body (see Fig. 14). If the lock lever 21 is further pressed, the footrest 3 will naturally swing out together with the footrest holder 4 due to the force (see Fig. 15). Get on and off the train in this state.

When returning the footrest 3 to the running position, apply force to the footrest 3 and return it together with the footrest holder 4 to the running position, and one side (inward direction of the vehicle body) of the lower part of the piston pin 16 (lock pin part 28) Since the piston pin 16 has an inclined surface, the piston pin 16 automatically fits into the hole 13 of the pipe 12 on the vehicle body side, thereby fixing the footrest 3 in the traveling position. With conventional footrests, it has not been possible to perform continuous operations such as unlocking and swinging out simply by lightly operating the lever. The present invention is superior in this respect.

(Effects of the invention) Since the invention is constructed as described above, it has the following effects.

Since the lock lever is close to hand when riding, it can be operated even by passengers who cannot move their hands freely. Since the lock lever is located at a position that is easy for the passenger to operate and is outside the footrest holder, it does not get in the way of the feet and the mechanism can be made more compact.

By making the lock lever longer, the lever ratio can be increased, making it possible to open and close the swing lockout with minimal operating force.

Since the rotation direction of the lock lever for unlocking is the same as the swing-out direction (opening direction) of the footrest, the unlocking and swing-out operations can be easily performed with a single movement of one hand.

Since the footrest assembly can be constructed by simply inserting the pipe on the footrest side into the pipe on the chassis frame side, like the conventional one, installation and removal are extremely easy.

[Brief explanation of the drawing]

1 to 3 are perspective views of conventional footrest portions of wheelchairs. FIG. 4 is a perspective view of another example of the conventional footrest portion. 5 and 6 are partially sectional front views showing essential parts of an embodiment of the present invention in different states. Fig. 7 is a side view of the wheelchair shown in Figs. 5 and 6, Fig. 8 is a perspective view of an electric wheelchair equipped with the device of the present invention, and Fig. 9 is an exploded perspective view of the wheelchair shown in Fig. 7. , No. 10 is an exploded cross-sectional view of the case and reinforcing plate portion in FIG. 9, and FIG.
FIG. 12 is a partially sectional side view of the assembled state of the device shown in FIG. 10, and FIGS. 13 to 15 are perspective views for explaining the operation. DESCRIPTION OF SYMBOLS 1... Chassis frame, 3... Footrest, 4... Footrest holder, 12... Pipe, 13... Hole, 16... Piston pin, 21...
...Rock lever, 26...Electric wheelchair.

Claims (1)

[Scope of utility model registration request] In a wheelchair in which a footrest holder is rotatably supported with respect to a chassis frame, a hole is provided in the chassis frame side member, and a pin that fits into the hole is provided on the footrest holder side,
A footrest for a wheelchair, characterized in that a lock lever is provided to control insertion of the pin.