JP2000042042A - Motor-driven wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven wheelchair capable of allowing even a small person or the like to mount the feet on a step, reducing the number of components and simplifying constitution. SOLUTION: Caster supporting cylinders 5 for casters 4 are respectively vertically welded on both sides of the front part of a chassis frame 2 for constituting this wheelchair and an almost inverse L shaped step arm 17 is supported by the respective caster supporting cylinders 5. Then, the suspended tip part sides 18 of a pair of the step arms 17 are brought closer to each other, the tip part sides 18 of a pair of the step arms 17 and a pair of the caster supporting cylinders 5 are parallelly equipped, the tip part sides 18 of a pair of the step arms 17 are brought closer to the front part of the chassis frame 2 and the step 8 is supported by the tip parts of a pair of the step arms 17 through a pair of inserting cylinders 24. Since the step 19 is positioned near the front part center of the chassis frame 2, even in the case of a child of small body or the like, the feet are mounted on the step 19 and a posture is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wheelchair, and more particularly to an improvement in a step structure.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a conventional electric wheelchair includes a wheelchair 1 and a driving device 10 installed on the wheelchair 1. The driving device 10 is driven to drive the wheelchair 1.
I want to run.

The wheelchair 1 includes a chassis frame 2 and a seat frame 3 which is removably mounted on the chassis frame 2. The chassis frame 2 is configured by combining a plurality of frames and pipes, and has cylindrical caster support cylinders 5 rotatably rotatably supporting casters 4 as front wheels, which are vertically welded to both front sides thereof. A step arm 6 that bends and extends forward is inserted and supported rotatably through a collar in each caster support cylinder 5, and a lock mechanism 7 is attached to each step arm 6. The plate-shaped step 8 is supported via a fastener.

A battery cover 9 accommodating a plurality of power supplies and a pair of driving devices 10 for driving a traveling motor by power supply from the power supplies are provided from the center to the rear of the lower portion of the chassis frame 2. Each drive 1
A drive wheel 11, which is a rear wheel, is fitted to the output shaft 0.

[0005] The seat frame 3 is composed of a combination of a plurality of pipes, an under sheet is detachably mounted on the bottom surface thereof, and a substantially inverted U-shaped back frame 1 is provided on the back surface thereof.
2 is erected upright via a fastener, and a seat back is mounted on the back frame 12. At the left and right sides of the seat frame 3, substantially inverted L-shaped pipes 13 are respectively erected through fasteners.
A plate-shaped armrest guard 14 and a detachable armrest 15 are screwed to 3 respectively. Further, a controller 16 with a display meter is attached to one pipe 13, and this controller 16 controls ON / OFF of a power supply, speed, and the like.

In the above configuration, when an adult with a partially disabled body moves in an electric wheelchair, he / she sits down on the underseat of the seat frame 3 and puts his feet on a pair of steps 8. By appropriately operating the switches and levers, the respective driving devices 10 are driven to drive the driving wheels 1.
1 can be rotated to move to a predetermined place at a predetermined speed.

As related prior art documents of this kind,
Japanese Utility Model Laid-Open Publication No. 6-427 and the like.

[0008]

The conventional electric wheelchair is
The step 8 is configured on the basis of the physique of an adult, and the step 8 is located in front of the caster support tube 5. Therefore, when the user is a child, the posture becomes unstable without putting his feet on the step 8. There is a problem that sufficient effects cannot be expected for children. To solve this problem, a method of positioning the step 8 near the caster support cylinder 5 is considered. However, in the conventional electric wheelchair, a space for turning the caster 4 needs to be secured near the caster support tube 5, so that a sufficient space for the step 8 cannot be secured. As a result, the position of step 8 cannot be changed, and the problem cannot be solved.

Further, in the conventional electric wheelchair, since the step arm 6 is rotatably inserted to the outer side in the vehicle width direction in each caster support cylinder 5, it is easy to transfer and assist, but the lock composed of a plurality of parts is used. A mechanism 7 is required. Therefore, there is a problem that the number of parts cannot be reduced and the configuration cannot be simplified.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an electric wheelchair which enables even a small person or the like to step on a step, and which can reduce the number of parts and simplify the configuration. It is intended to provide.

[0011]

According to the first aspect of the present invention, in order to achieve the above object, a driving device is driven to drive a wheelchair. The caster support cylinders are respectively provided upright, and the pair of caster support cylinders respectively support the step arms facing inward in the vehicle width direction of the body frame, and the tip end sides of the pair of step arms are bent downward to mutually It is characterized in that it is positioned closer to the front of the lower part of the vehicle body frame, and the steps are supported at the distal ends of the pair of step arms via a pair of inserted cylinders.

A plurality of screw holes are provided at the tip end side of each of the step arms in a vertically arranged state, and screw holes are provided in each of the insertion cylinders. It is preferable that the screw member is screwed to the screw hole of the insertion tube. It is desirable that the diameter of the screw hole be larger than the diameter of the screw member.

According to the first aspect of the present invention, the step is supported by the bent end portion of each step arm, and is located close to the lower front of the body frame. Therefore, even when the person using the electric wheelchair is a small child or the like, the foot can be easily put on the steps. Further, since the distal end side of each step arm defines a space between each caster and the step, it is possible to secure a space for turning the caster and prevent the step from interfering with the caster.

According to the second aspect of the present invention, since the step arm is provided with a plurality of screw holes for height adjustment, the vertical position of the step is stepped according to the physique of the person using the electric wheelchair. Can be set freely. Further, according to the third aspect of the present invention, the screw holes of each step arm and the screw holes of each inserted cylinder are formed larger than the diameter of the screw member. Manufacturing errors and / or distortions can be absorbed and dealt with.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. As shown in FIGS. 1 and 2, the electric wheelchair according to the present embodiment is configured such that caster support tubes 5 for casters 4 are vertically welded to both front sides of a chassis frame 2 constituting the wheelchair 1, respectively. 5, a step arm 17 having a substantially inverted L-shape is inserted and supported from above, the tip end sides 18 of the pair of step arms 17 are brought close to each other, and the tip end sides 18 of the pair of step arms 17 and the casters The support cylinder 5 and the step arm 17 are disposed in parallel with each other.
Is positioned at the front of the chassis frame 2, and a step 19 is provided at the distal end of the pair of step arms 17.
4 to be supported.

As shown in FIGS. 2 and 4, each step arm 17 has a plurality of screw holes 21 for adjusting the height, which are penetrated by bolts 20 at a predetermined pitch, at the long end portion 18 thereof. A pin 22 fitted to the caster support cylinder 5 is welded to the end. The plurality of screw holes 21 are bored vertically, and are formed to have a diameter larger by 1 mm than the diameter of the bolt 20.

In the step 19, as shown in FIGS. 2, 3, 5 and 6, the step 19 is basically formed in a substantially U-shaped plane, and a plurality of reinforcing pipes 23 are provided between the right and left sides thereof. It is erected and welded side by side. At the ends on both left and right sides of the step 19, cylindrical insertion tubes 24 are vertically welded respectively, and a reinforcing pipe 23 is horizontally welded between the pair of insertion tubes 24 so as to be welded. The cylinder 24 has a plurality of screw holes 25 penetrated by the bolts 20. The plurality of screw holes 25 are also bored side by side in the vertical direction, and are formed to have a diameter larger by 1 mm than the diameter of the bolt 20. The other parts are the same as in the conventional example, and the description is omitted.

In the above configuration, when assembling the step 19, first, the pins 22 of the step arm 17 are inserted into the pair of caster support cylinders 5, respectively, and the tip end sides 18 of the pair of step arms 17 are brought closer to each other. . Then, a step 1 is attached to the tip of the pair of step arms 17.
9 and the plurality of screw holes 25 of the inserted tube 24 and the plurality of selected screw holes 21 of the step arm 17 are positioned. Thereafter, the plurality of screw holes 21 and 25 are positioned. Insert the bolt 20 and tighten the nut 26
Step 19 can be firmly assembled by tightening the screws.

Next, the method of use will be described. When a child with a partially disabled body moves in an electric wheelchair, the child sits down on the underseat of the seat frame 3 and puts his feet on step 19, When the switches and levers of the controller 16 are appropriately operated, each drive device 10 can be driven to rotate the drive wheel 11 and move to a predetermined place at a predetermined speed.

At this time, since the step 19 is located near the center of the front part of the chassis frame 2, even if the user is a small child or the like, it is possible to stabilize the posture by putting the foot on the step 19. it can. In addition, each step arm 1
Since the end side extending inward in the vehicle width direction (inward in the horizontal direction) of the vehicle 7 defines a space between each caster 4 and the step 19 (see FIG. 3), the step 19 for the caster 4 is performed.
Can be effectively prevented with a simple configuration. Further, if the pair of step arms 17 and step 19 are screwed together with bolts 20 and nuts 26, the lock mechanism 7 can be omitted, so that a reduction in the number of parts and simplification of the configuration can be greatly expected.

Further, since a plurality of screw holes 21 for height adjustment are formed in the step arm 17, the vertical position of the step 19 can be freely set. Furthermore,
The screw hole 21 of each step arm 17 and each inserted cylinder 24
Are formed to have a diameter larger than the diameter of the bolt 20, so that a dimensional error between the left and right casters 4,
In this case, it is possible to easily deal with the manufacturing error and / or distortion of No. 9 and prevent the mounting failure.

In the above embodiment, the step arm 17 has a substantially inverted L-shape, but the present invention is not limited to this. For example, each step arm 17 may be formed in a substantially inverted J shape or the like. Although the step arm 17 made of a pipe is shown, a step arm 17 having a solid rod shape or the like may be used. Furthermore, although the step 19 is constructed by combining a plurality of pipes, the step 19 is a plate-shaped step or the like having a pair of inserted cylinders 24.
But it is good.

[0023]

As described above, according to the present invention, there is an effect that even a person with a small body or the like can stabilize the posture by putting his feet on the steps. Furthermore, compared to the past,
Since the number of parts is small, it is possible to simplify the structure and reduce costs.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of an electric wheelchair according to the present invention.

FIG. 2 is an enlarged perspective view of a main part showing an embodiment of the electric wheelchair according to the present invention.

FIG. 3 is an explanatory plan view showing an embodiment of the electric wheelchair according to the present invention.

FIG. 4 is an explanatory diagram showing a step arm in the embodiment of the electric wheelchair according to the present invention.

FIG. 5 is an explanatory plan view showing steps in the embodiment of the electric wheelchair according to the present invention.

FIG. 6 is an explanatory side view showing steps in the embodiment of the electric wheelchair according to the present invention.

FIG. 7 is a side view showing a conventional electric wheelchair.

FIG. 8 is a perspective view of a main part showing a conventional electric wheelchair.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wheelchair 2 chassis frame (body frame) 3 seat frame 4 caster 5 caster support tube 10 drive device 17 step arm 18 distal end side 19 step 20 bolt (screw member) 21 screw hole 24 insertion tube 25 screw hole

Claims (3)

[Claims] An electric wheelchair for driving a wheelchair by driving a driving device, wherein caster support cylinders are provided upright on both lower front sides of a body frame constituting the wheelchair, and the pair of caster support cylinders is provided with the body frame. The step arms facing inward in the vehicle width direction are respectively supported, and the tip end sides of the pair of step arms are bent downward to approach each other, and are positioned at the lower front of the body frame, and An electric wheelchair, wherein a step is supported at a tip end portion via a pair of inserted cylinders. 2. A plurality of screw holes are provided on the tip end side of each of said step arms in a vertically arranged state, and screw holes are provided in each of said cylinders to be inserted. The electric wheelchair according to claim 1, wherein a screw member is screwed into a screw hole of the insertion tube. 3. The electric wheelchair according to claim 2, wherein the diameter of the screw hole is larger than the diameter of the screw member.