JP2002301107A - Wheelchair and attachment for wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheelchair which enables itself to move up steps by easier operation, and to provide an attachment for the wheelchair which is mounted on the wheelchair to help it move up onto upper steps. SOLUTION: The wheelchair 1 has the body 2 thereof, front wheels 3, rear wheels 4, rotary arms 6, pressing arms 7 and an operation lever 8. The rotary arms 6 are rotatably mounted on the body 2 of the wheelchair around the axis of the first rotating shaft 6S parallel with the axle 4S of the rear wheels 4 and extend upward askew behind the first rotating shaft 6S. Operators turn the rotary arms 6 with the operation lever 8. The pressing arms 7 are rotatably pivoted around the axis of the second rotary shaft 7S parallel with the axle 4S of the rear wheels 4 near the tips of the rotary arms 6 and when the rotary arms 6 are turned in the direction of letting the tips thereof move downward askew backward, the tip parts 7d thereof touch the ground behind the rear wheelchairs 4 to press the ground down askew backward at the ground point DDP thereby pushing the body 2 of the wheelchair forward askew upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheelchair and an attachment for a wheelchair, and more particularly, to a wheelchair which is easy to ascend to an upper surface of a step and an attachment for a wheelchair which is attached to the wheelchair to easily ascend to an upper surface of a step.

[0002]

2. Description of the Related Art It is known that wheelchairs, which are often used by persons with physical disabilities, are difficult to ascend steps caused by curbs or the like that separates a roadway and a sidewalk, and various proposals have been made to improve this. I have. For example, JP-A-11-31899
According to No. 3, a pulley and a front auxiliary wheel are provided in front of a wheelchair, and a pulley and a rear auxiliary wheel are also provided behind the wheelchair. First, the front wheel is mounted on the upper stage using the front auxiliary wheel, and thereafter, the wheelchair is set by the rear auxiliary wheel. The rear wheel is raised to the height of the upper stage, the lower stage is pushed with a cane, and the front wheel is moved forward so that the rear wheel also lands on the upper stage. Further, according to Japanese Patent Application Laid-Open No. 2000-288032, a chain is provided for transmitting the rotation of the main wheel to the rear auxiliary wheel, the front wheel is placed on the upper stage, and after the wheelchair is lifted by the rear auxiliary wheel, the main wheel is It discloses that the rear auxiliary wheel is rotated forward by rotating the wheelchair, and the wheelchair is moved forward to land on the upper stage.

[0003]

However, in these techniques, the wheelchair body is once lifted with the front wheel placed on the upper stage, and then the wheelchair is advanced by a cane or a chain to land the rear wheel on the upper stage. Therefore, when it takes time to climb the step, and when the lower step surface is inclined backward, the rear wheel or the rear auxiliary wheel may rotate backward and the wheelchair may move backward so as to separate from the step. There was also difficulty in operability. The present invention has been made in view of the above problems, and provides a wheelchair which is easy to operate and can easily climb a step, and an attachment for a wheelchair which is attached to the wheelchair and which easily rises to an upper surface of the step. The purpose is to:

[0004]

Means for Solving the Problems, Actions and Effects The means for solving the problems is as follows: a wheelchair main body, a front wheel mounted on a lower front side of the wheelchair main body, a rear wheel located behind the front wheel, A rotating arm rotatably attached to a wheelchair body around an axis of a first rotating shaft parallel to an axle of the rear wheel, the arm extending obliquely rearward and upward from the first rotating shaft. A moving arm, rotating arm operating means for rotating the rotating arm, and a second rotation parallel to the axle of the rear wheel at a portion of the rotating arm obliquely above and behind the first rotating shaft. A pressing arm rotatably supported about an axis of a dynamic shaft, wherein one end of the pressing arm is turned when the turning arm is turned in a direction in which the tip moves obliquely downward and downward. Touch the ground behind the rear wheel, and lower the ground diagonally backward at this point A pressure arm that presses a wheelchair comprising a.

According to the present invention, when the rotating arm is rotated by the rotating arm operating means such that the tip thereof moves obliquely downward and rearward, one end of the pressing arm is grounded behind the rear wheel, and the contact is established. At the point, press the ground diagonally backward and downward. Therefore, when the wheelchair approaches the step, first, the front wheel rides on the upper surface of the step, and the rear wheel contacts the lower surface of the step and the wheelchair approaches or comes into contact with the rising surface of the step. It will be in the state of being positioned. Thereafter, when the turning arm is turned by the turning arm operating means and the ground (lower surface) is pressed by the pressing arm, the wheelchair main body is pushed upward obliquely upward by the reaction force. In other words, the wheelchair body is lifted and pushed forward at the same time, and the rear wheel rides on the upper surface from the rising surface of the step portion, so that the entire wheelchair can be placed on the upper surface. Moreover, since one end of the pressing arm presses the ground (lower surface) without rolling like the rear wheel auxiliary wheel, the wheelchair can move backward even if the ground (lower surface) has a slight inclination. As a result, the step can be stably climbed.

[0006] When the wheelchair approaches the step, the front wheel can be moved over the step by, for example, tilting the body of the wheelchair backward by leaning the upper body backward and riding the front wheel on the upper step surface of the step. This is done by letting them ride. Alternatively, the front wheels can be mounted on the upper stage using the front auxiliary wheels described in JP-A-11-318993. Then, by moving the wheelchair forward, the rear wheel may be moved forward to a position where the rear wheel abuts on the rising surface of the step portion or comes close enough.

It is preferable that one set of the rotating arm and the pressing arm is provided on each of the right side and the left side of the wheelchair. When the wheelchair body is pushed up at one place, the posture of the wheelchair tends to be unstable, for example, it tilts right and left. Also, because there are irregularities and inclinations in the left-right direction in a normal roadway or sidewalk, etc., by separately setting the right and left sides, each can surely press the ground. As the rotating arm operating means, any means can be used as long as the rotating arm can be rotated. For example, an operating lever connected to the rotating arm can be used. Further, a rotating arm using a wire, a chain, a belt, or the like can be rotated.

In the wheelchair, the turning arm operating means includes an operating lever, and by moving the operating lever forward or downward, the tip of the rotating arm moves obliquely rearward and downward. Preferably, it is a wheelchair that rotates in the direction. For an operator (passenger) such as a person with a physical disability, the rotating arm is operated so that the operator can move over the step by pushing and moving the operating lever forward or downward rather than pulling the operating lever forward or pulling it upward. This is because, when the means is configured, the weight and the strength of the upper body can be easily used and the operation can be easily felt.

Further, in the wheelchair, the turning arm is turned by the turning arm operating means, and the rear wheel is moved in parallel with the pressing arm pressing the ground contact surface at one end thereof. It is preferable to provide a wheelchair provided with a rear wheel front turning means for turning forward.

[0010] In the wheelchair of the present invention, the rear wheel is rotated forward by the rear wheel forward rotation means in parallel with the pressing arm pressing the ground contact surface at one end thereof. By pushing up by the pressing arm, the rear wheel comes into contact with the rising surface of the stepped portion, or the edge between the rising surface and the upper step surface. On the upper stage.

More specifically, it is preferable that the rear wheel is rotated forward by the rotation of the rotation arm in a direction in which the tip of the rotation arm moves obliquely rearward and downward by the gear mechanism. That is, it is preferable that the wheelchair includes a gear mechanism that rotates the rear wheel forward by turning the turning arm in a direction in which the tip of the turning arm moves obliquely rearward and downward. . With this configuration, the rotating arm is rotated by the rotating arm operating means in such a direction that the tip moves obliquely downward and downward, and the pressing arm presses the ground (lower surface) and the rotating arm rotates. Since the rear wheels can be turned forward in accordance with the angle, the operation is easy and it is possible to smoothly climb the step. In consideration of operability, it is preferable that this gear device is set so as to transmit power at an appropriate angular velocity ratio.

It is preferable that the gear mechanism is configured so that the connection between the rotating arm and the rear wheel can be disconnected by the rotating arm operating means. When raising the wheelchair to the step, the rear wheel only needs to be rotated forward with the rotation of the rotating arm, and it is not necessary to interlock with the rotating arm during normal traveling,
This is because if the connection can be cut by the rotating arm operation means, the operation becomes easy.

Alternatively, in an electric wheelchair in which a rear wheel is rotationally driven by a traveling motor, it is preferable that the rotating arm is rotated by the traveling motor using a gear mechanism. That is, in the wheelchair, the driving motor for driving the rear wheel to rotate, and a part of the driving force of the driving motor for rotating the rear wheel forward, It is preferable that the wheelchair is provided with a gear mechanism for transmitting the rotation power of the rotation arm in a direction moving obliquely downward. With this configuration, the rear wheel can be rotated forward by the traveling motor, and the ground can be pressed by the pressing arm by the rotation of the rotating arm by the traveling motor, so that the operation is facilitated. In addition, since it is not necessary to lift the wheelchair main body with the strength (operating force) of the occupant sitting in the wheelchair, the occupant can easily go over the steps without burden.

Still another solution is a wheelchair including a wheelchair main body, a front wheel mounted on a front lower side of the wheelchair main body, and a rear wheel located behind the front wheel.
The wheelchair is positioned so that the front wheel rides on the upper surface and the rear wheel touches the lower surface and approaches or comes into contact with the rising surface of the step at a step formed by a lower surface and an upper surface. In this state, the lower surface is pressed obliquely downward rearward behind the rear wheel to push the wheelchair body obliquely upward and forward, and as the wheelchair advances, the push-up angle is maintained while maintaining the pressing position of the lower surface. Lifting means configured to be smaller,
A rear wheel turning means for rotating the rear wheel forward in parallel with the pushing of the wheel chair by the pushing means.

The wheelchair of the present invention has a lifting means. With the front wheel riding on the upper surface of the step, the rear wheel touching the lower surface of the step and the wheelchair positioned so that it approaches or abuts the rising surface of the step, the wheelchair body is tilted forward by the lifting means. When the wheelchair is pushed upward, the wheelchair body is lifted and simultaneously pushed forward, and the rear wheel rides on the upper surface from the rising surface of the step portion, so that the entire wheelchair can be placed on the upper surface.

Further, the push-up means is configured so that the push-up angle becomes smaller as the wheelchair advances, while keeping the pushing position of the lower step surface. For this reason, the push-up means also moves in parallel with the advance of the wheelchair, so that friction does not occur between the push-up means and the lower step surface, which does not hinder the advance of the wheelchair. Further, since this wheelchair has a rear wheel forward turning means, the rear wheel also turns forward in parallel with the pushing up of the wheelchair body by the pushing means. By pushing up,
Since the rear wheel abuts on the rising surface of the stepped portion or the edge between the rising surface and the upper step surface, if the rear wheel is rotated forward by the rear wheel front rotation means, the rear wheel itself will climb the step. Since it operates, the rear wheel, and thus the wheelchair body, can be more easily mounted on the upper surface in combination with the pushing up and pushing forward by the pushing up means.

Still another solution is a wheelchair attachment mounted on a wheelchair including a wheelchair main body, a front wheel mounted on a front lower side of the wheelchair main body, and a rear wheel positioned behind the front wheel. A rotating arm rotatably mounted on the wheelchair body about an axis of a first rotating shaft parallel to the axle of the rear wheel, the arm being obliquely rearward and upward from the first rotating shaft. A pivot arm extending to the pivot arm, a pivot arm operating means for pivoting the pivot arm, and a portion of the pivot arm obliquely above and behind the first pivot axis and parallel to the axle of the rear wheel. A pressing arm rotatably supported about an axis of a second rotating shaft, wherein the rotating arm is rotated in a direction in which a tip of the rotating arm moves obliquely downward and rearward; One end is grounded behind the rear wheel. A pressing arm which pushes the ground rearward obliquely downward at a point, a wheelchair attachment comprising a.

Since this wheelchair attachment includes a rotating arm, a rotating arm operating means, and a pressing arm, if it is mounted on an existing wheelchair, the wheelchair can easily go up to the step. In other words, when the wheelchair equipped with this wheelchair attachment approaches the step, first, the front wheel rides on the upper surface of the step, the rear wheel touches the lower surface of the step and the rising surface of the step. The wheelchair is positioned so as to approach or abut. Thereafter, when the turning arm is turned by the turning arm operating means and the ground (lower surface) is pressed by the pressing arm, the wheelchair main body is pushed upward obliquely upward by the reaction force. In other words, the wheelchair body is lifted and pushed forward at the same time, and the rear wheel rides on the upper surface from the rising surface of the step portion, so that the entire wheelchair can be placed on the upper surface. In addition, since one end of the pressing arm presses the ground (lower surface), even if the ground (lower surface) is slightly inclined, the wheelchair is prevented from moving backward.

The wheelchair attachment is a wheelchair attachment provided with a gear mechanism for rotating the rear wheel forward by turning the turning arm in a direction in which the tip of the turning arm moves obliquely downward and rearward. Is preferred.
With this configuration, the rotating arm is rotated by the rotating arm operating means in a direction in which the tip thereof moves obliquely downward and rearward,
This is because the pressing arm can press the ground (lower step surface) and rotate the rear wheel forward, so that the operation is facilitated.

[0020]

(Embodiment 1) A first embodiment of the present invention will be described with reference to the drawings. 1 is a partially cutaway perspective view of a wheelchair, FIG. 2 is an exploded perspective view of a wheelchair attachment, FIG. 3 is an enlarged view showing a mounting portion of the wheelchair attachment, and FIG. 4 is a cross-sectional view of a mounting portion of the wheelchair attachment. It is. A wheelchair 1 shown in FIG. 1 has a front wheel 3 on a front lower side of a wheelchair body 2 made of a metal pipe or the like.
Reference numeral 3 denotes a manual wheelchair provided with rear wheels 4, 4 on the rear side and right and left sides of the wheelchair body 2, respectively. As will be described later, wheelchair attachments 10 and 11 are provided on both sides of the wheelchair main body 2 to make it easy to climb a step.
Are pair-mounted. In the present embodiment, the right and left rear wheels 4 and 4 of the wheelchair attachments 10 and 11 are supported by the wheelchair body 2 via the attachment members 5 and 5.

The above-mentioned wheelchair body 2 has a frame 2a in which a structural material such as a pipe is framed in the illustrated shape. A cloth seat 2b is provided at the center of the frame 2a, a pair of front wheels 3 and 3 are mounted below the front of the frame 2a, and a pair of footrests 2d and 2d are mounted in front of the pair. I have. On the other hand, the frame 2a
At the rear upper end position, grips 2e, 2e for an assistant are provided. Although not shown, the frame 2a is connected to the left and right by X-shaped reinforcing members. 2h is a backrest, 2i is a handrail, and 2j is a handbrake capable of braking the rear wheel 4. Although illustration is omitted,
Hand rims for turning operation by the occupant are mounted on the rear wheel 4 concentrically outside thereof.

Next, wheelchair attachments 10, 11
Will be described. The wheelchair attachment 10
And 11 are formed symmetrically with respect to a center line extending in the traveling direction of the wheelchair 1, and therefore are assigned corresponding symbols,
Avoid duplicate explanations. As shown in FIGS. 2 to 4, the attachment 10 (11) is roughly divided into a mounting member 5 formed detachably on the frame 2 a and a rotating arm rotatably mounted on the mounting member 5. 6, a pressing arm 7 attached near the tip of the rotating arm 6, an operation lever 8 for rotating the rotating arm 6, and the rear wheel 4 rotating forward with the rotation of the rotating arm 6. And a gear mechanism 9.

The substantially inverted L-shaped mounting member 5 is shown in FIGS.
As shown in the figure, the rear wheel supporting portion 2 of the frame 2a is provided in the vertical groove 5a.
Fixing bolt 5b with k near partially fitted
And the nut 5c is fixed to the frame 2a. In addition,
In this embodiment, as a through hole on the side of the frame 2a through which the fixing bolt 5b is inserted, before mounting the wheelchair attachment 10, the rear wheel supporting portion 2k of the frame 2a for inserting the axle 4b of the rear wheel 4 is provided. The formed axle insertion hole was used as it was. Therefore, in the present embodiment, the wheelchair attachments 10, 1 are attached to the frame 2a.
It is not necessary to separately drill a through-hole when mounting 1. Further, an axle insertion hole 5e is formed in the mounting member 5 at an overhanging front side position. The axle 4b, the washer 4c, and the nut 4d inserted into the axle insertion hole 5e allow the rear wheel 4, the spacer 5f, and the gear. A driven gear (spur gear) 9b of the mechanism 9 is supported concentrically and integrally so as to be rotatable around the axis 4S (see FIG. 4).

A drive gear (spur gear) 9 meshable with the outer plate 6a and the driven gear 9b is provided at the base end side of the rotating arm 6.
a, and the inner plate 6b opposed to these at a predetermined interval is arranged so as to sandwich the mounting member 5. A support shaft 6c for integrally and rotatably supporting the outer plate 6a, the drive gear 9a and the inner plate 6b, a washer 6d, and a nut 6e.
However, a bearing 5h (to be described later) slidably provided in a vertical direction in a concave portion 5i penetrating a vertically long slot 5ip.
Is supported by the mounting member 5. Thereby, the rear wheel 4
The turning arm 6 can turn around the first turning shaft 6S parallel to the axis 4S of the axle. In order to prevent foreign matter from entering the concave portion 5i from the inner plate 6b side, the concave portion 5i may be covered with a lid member provided with a vertically long slot through which the support shaft 6c is inserted.

Further, the outer plate 6a and the inner plate 6b have
Ribs 6f, 6f, 6g extending obliquely rearward and upward, respectively.
6g is fixed, and a bracket 6h is fixed near these tips to form an arm. The bracket 6h is provided with a through hole 6h1,
Are combined. Specifically, a coupling member 7b for coupling the ribs of the pressing arm body 7a composed of two ribs to each other is formed by a shaft member 7c inserted into the through hole 6h1.
The rear wheel 4 is attached to be rotatable around a second rotation shaft 7S parallel to the axis 4S of the axle. A distal end 7d made of a rubber-like elastic body is fixed to the distal end (lower end) of the pressing arm body 7a. A link 6k comprising ribs 6i and 6j is provided between the rib 6g of the rotating arm 6 and the pressing arm main body 7a to reinforce the link. The pressing arm 7
In order to maintain the posture in which the (pressing arm main body 7a) extends obliquely forward and obliquely downward and rearward, the connecting member 7b is rotated when the pressing arm main body 7a is rotated forward (clockwise in FIGS. 2 and 3). Abuts against the bracket 6h to prevent the pressing arm 7 from rotating forward.

As shown in FIG. 2, the outer plate 6a
It has a substantially L-shaped protruding portion 6a1 that extends once obliquely downward and forward, and has a front end to which a crank-shaped operation lever 8 is attached. Therefore, when the occupant operates the operation lever 8, the turning arm 6 can be turned around the first turning shaft 6S.

Here, the above-described bearing 5h is urged downward by the spring 5j in the concave portion 5i to push down the support shaft 6c and the driving gear 9a supported by the support shaft 6c. For this reason, as shown in FIG.
Is separated from the driven gear 9b so as to be disconnected from the driven gear 9b, so that the rotation of the rear wheel 4 is not transmitted to the driving gear 9a. However, when the rider raises the operation lever 8, the bearing 5h, the support shaft 6c, and the drive gear 9a are lifted against the spring 5j, so that the drive gear 9a meshes with the driven gear 9b.

Next, the operation method and operation of the wheelchair 1 and the wheelchair attachments 10 and 11 configured as described above will be described. Wheelchair attachment 10,1
1 can be used by assembling it with a ready-made manual wheelchair. That is, the wheelchair attachment 1
In order to mount 0 and 11, the rear wheel 4 is temporarily removed, the mounting member 5 is fixed to the frame 2a, and the rear wheel 4 is attached to the spacer 5f.
And, it is attached to the axle insertion hole 5e of the attachment member 5 via the axle 4b while being integrated with the driven gear 9b. As shown in FIGS. 1 and 5, the turning arm 6 and the pressing arm 7 rotatably mounted on the mounting member 5 have a tip 7 d of the pressing arm 7 located above the ground G on flat ground. So that the normal use of the wheelchair 1 is possible. However, as described above, since the axle 4b of the rear wheel 4 is offset forward as compared with the axle position before the attachment of the wheelchair attachments 10, 11, the occupant may bend the upper body backward, for example. Wheelchair body 2 to axle 4
It is easy to tilt backward around b. The wheelchair body 2
In order to prevent overturning when the is tilted backward, it is preferable to attach an overturn prevention rib, for example, an overturn prevention rib 2m that is bent in an arc shape and the tip is directed downward at the lower rear portion of the frame 2a.

When the occupant of the wheelchair 1 approaches the step D and climbs on the upper surface DU of the step D, the occupant turns the body backward at a position in front of the step D, for example. Then, the wheelchair body 2 is tilted rearward so that the front wheel 3 is placed on the upper surface DU (see FIG. 6). Next, in this posture, the rear wheel 4 of the wheelchair 1 moves forward to a position where it comes into contact with the rising surface DT of the step D (see FIG. 7). In addition, since the wheelchair body 2 is formed with the overturn prevention rib 2m, when the wheelchair body 2 leans largely backward, the tip of the overturn prevention rib 2m abuts on the lower surface DD, and the wheelchair body 2 leans backward by a certain angle or more. Not to be.

Next, the rear wheel 4 has a rising surface D of the step portion D.
Upon contact with T, the occupant raises the operation lever 8 as shown in FIGS. Then, the operation lever 8 rotates the rotation arm 6 around the support shaft 6c (first rotation shaft 6S), specifically, in a direction in which the tip thereof moves obliquely downward and rearward. Then, the pressing arm 7 is pushed down, and the tip end 7d touches the lower surface DD behind the axle 4c of the rear wheel 4, and further presses the lower surface DD obliquely downward rearward at the ground point DDP. Therefore, the wheelchair body 2 is pushed up obliquely upward and forward together with the occupant by this reaction force, and is lifted and pushed forward. Therefore, FIG.
As shown in (2), the rear wheel 4 can ride on the upper surface DU from the rising surface DT of the step portion D, and the entire wheelchair 1 can be placed on the upper surface DU. At this time, since the pressing arm 7 is rotatable around the second rotation shaft 7S, the tip 7d of the pressing arm 7 is moved to the ground point DDP with the advance of the wheelchair body 2.
The posture is changed so that the angle β formed with the lower surface DD is reduced, that is, the vehicle falls down forward while being in contact with. Therefore,
Even if the wheelchair body 2 moves forward, the tip 7d of the pressing arm 7
Can be pushed forward, and the wheelchair body 2 can be pushed forward.

Further, in this embodiment, as shown in FIG. 8, when the operating lever 8 is lifted, the support shaft 6c and the driving gear 9a are lifted as described above, so that the driving gear 9a meshes with the driven gear 9b. . Then, when the operation lever 8 is further lifted, the front wheel 4 is also rotated forward by the rotation of the rotation arm 6 by the driving gear 9a and the driven gear 9b. Therefore, the front wheel 4 itself is also provided with the driving force, and the step surface D
Since it is going to go up T, it is possible to go up the step D more easily.

When the occupant lowers the operation lever 8, the spring 5j pushes down the bearing 5h and the support shaft 6c,
Since the driven gear 9b and the drive gear 9a are separated from each other, the rear wheel 4 integrated with the driven gear 9b can rotate independently of the rotating arm 6, and can travel normally. Also,
The rotating arm 6 and the pressing arm 7b return to the original posture. The operating lever 8 may have an appropriate length in consideration of the operability of the occupant, but is preferably formed to be longer than the radius of the rear wheel 4 in order to reduce the operating force. Also,
The reduction ratio of the gear mechanism 9 such as the driving gear 9a and the driven gear 9b can also be set appropriately.

In the first embodiment, the example in which the wheelchair attachments 10 and 11 are mounted on the ready-made manual wheelchair 1 has been described. However, the rotary arm 6, the pressing arm 7, and the operating lever 8 are mounted on the frame 2 a from the beginning of manufacture. It goes without saying that a wheelchair equipped with the like may be manufactured. In the first embodiment, the example in which the drive gear 9a and the driven gear 9b are used as the gear mechanism 9 has been described, but another gear mechanism may be used. Further, in the present embodiment, the gear mechanism 9 is used as the rear wheel forward rotation means, but any device that rotates the rear wheel 4 forward together with the rotation of the rotating arm and the pressing of the ground by the pressing arm is used. Alternatively, the torque of the rear wheel may be transmitted using a chain or a wire, or a link mechanism may be used.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to the drawings. In the first embodiment described above, the configuration in which the occupant pulls up the operation lever 8 and the wheelchair main body 2 climbs the step D is adopted. On the other hand, the second embodiment is different from the second embodiment in that the occupant pushes the operation lever 8 forward so that the wheelchair body 2 climbs the step D. In the first embodiment, the front wheel 4 is rotated forward with the rotation of the rotation arm 6 by the gear mechanism (rear wheel forward rotation mechanism) 9. However, the second embodiment is different in that the gear mechanism is not provided. . However, the rest is almost the same except for the above, so that the description will focus on the different parts, and the description of the same parts will be omitted or simplified.

The wheelchair 21 of the present embodiment shown in FIG.
As in the first embodiment, a manual operation including a front wheel 3 at the front lower side of a wheelchair body 2 made of a metal pipe or the like, a rear wheel 4 behind the wheelchair 1 and left and right side portions of the wheelchair 1 and wheelchair attachments 22 and 23, respectively. It is a wheelchair. However, the axle of the rear wheel 4 is inserted into the axle insertion hole of the rear wheel support 2k of the frame 2a, and is supported rotatably.

The first mounting member 25A is mounted directly below the rear wheel supporting portion 2k of the frame 2a, and holds the rotating arm 26 bent in a substantially J shape at a substantially central portion in the longitudinal direction of the rear wheel. It is held rotatably about a first rotation axis 26S parallel to the axle. The rear portion 26a of the rotary arm 26 extends obliquely rearward and upward in the same manner as the rotary arm 6 in the first embodiment, and the distal end (one end of the rotary arm 26) connects the pressing arm 27 to the second. It is rotatably supported around the rotation shaft 27S. On the other hand, this rotating arm 26
Among them, the front portion 26b is bent in a substantially arc shape and extends upward, and is rotatably connected to the one end portion 29a of the connecting member 29 at the tip end (the other end of the rotating arm 26). .

On the other hand, the straight rod-shaped operation lever 28 is moved by the second mounting member 25B mounted on the frame 2a.
At about one third of the total length from the lower end, the rotation shaft 2
It is rotatably supported around 8S. Further, at the lower end, it is rotatably connected to the other end 29b of the connecting member 29. For this reason, unlike the operation lever 8 of the first embodiment (see FIG. 5), which is held substantially horizontally in the normal posture, as shown in FIG.
The operation lever 28 is in a normal posture when it is set almost vertically.

The wheelchair 21 goes up the step D in the same manner as the wheelchair 1 of the first embodiment. That is, the step D
In the case of climbing to the upper surface DU of the step portion D, the front wheel 3 is first placed on the upper surface DU (FIG. 6).
reference). Next, in this posture, the rear wheel 4 of the wheelchair 2 moves forward to a position where it comes into contact with the rising surface DT of the step D (FIG. 7).
reference).

Thereafter, the operation lever 28 is operated to move up the step D. However, unlike the first embodiment, as shown in FIG. 11, the occupant pushes the operation lever 28 forward or diagonally forward and downward. Press down. As a result, the operation lever 28 rotates around the rotation shaft 28S, and the rotation arm 26 rotates around the first rotation shaft 26S by the connecting member 29 connected thereto. Specifically, the rear part 2
The turning arm 26 turns in a direction in which the tip of 6a moves obliquely rearward and downward. Then, the pressing arm 27 is pushed down, and the front end portion 27b touches the lower surface DD behind the rear wheel, and further presses the lower surface DD obliquely downward rearward at the ground point DDP.

Accordingly, also in the second embodiment, the wheelchair main body 2 is pushed up obliquely upward and forward together with the occupant by this reaction force, and is lifted upward and pushed forward. Therefore, the rear wheel 4 can ride on the upper surface DU from the rising surface DT of the step D, and the entire wheelchair 21 can be placed on the upper surface DU. At this time, the pressing arm 2
7 is rotatable around the second rotation shaft 27S, so that the pressing arm 27 is moved to the distal end 27 as the wheelchair body 2 advances.
b is an angle β between the lower surface DD and the ground surface DDP.
Change the posture so that is smaller, that is, fall forward. Therefore, even if the wheelchair main body 2 moves forward, the distal end portion 27b of the pressing arm 27 is not dragged, and the wheelchair main body 2 can be pushed forward without dragging forward.

However, as can be easily understood, in the second embodiment, since no gear mechanism is provided, the front wheel 4 is not given a driving force for forward rotation. According to the second embodiment, when climbing the step D, the occupant pushes forward (or pushes down diagonally forward) when operating the operation lever 28. There is a merit that the operation can be felt more easily by using the weight of the user's body and the strength of the upper body than by pulling up the operation lever 8 as in the wheelchair 1 of the first embodiment.

In the second embodiment, the wheelchair attachments 22 and 23 such as the rotating arm 26, the pressing arm 27, and the operation lever 28 are mounted on the ready-made manual wheelchair 21 using the mounting members 25A and 25B. As explained in the example,
It goes without saying that a wheelchair in which the rotating arm 26, the pressing arm 27, the operation lever 28, and the like are mounted on the frame 2a from the beginning of manufacture may be manufactured.

(Embodiment 3) Next, a third embodiment in which an electric wheelchair is provided with a push-up means and a rear wheel forward rotation means similar to that of the first embodiment will be described with reference to FIG. In the first embodiment, the example in which the rotating arm 6 and the like are provided in the manual wheelchair 1 has been described. On the other hand, Embodiment 3
In the wheelchair 31, the traveling motor 34 is connected to the axle of the rear wheel 4, and the rear wheel 4 is driven by the driving force of the traveling motor 34. In such a wheelchair 31 as well, the steps 32 and 33 including the mounting member 5, the rotating arm 6, the pressing arm 8, the operation lever 8 and the gear mechanism 39, which are substantially the same as those in the first embodiment, are used, so that the stepped portion is formed. It becomes easy to ascend to the upper step surface DU of D.

That is, once the rear wheel 4 and the traveling motor 34
And the mounting member 5 is mounted on the frame 2a. The rear wheel 4, the drive gear 39a and the traveling motor 34 are mounted on the mounting member 5, and the rear wheel 4 is driven by the traveling motor 34.
And the drive gear 39a can be integrally rotated. Note that, unlike the first embodiment, the rear wheel 4 and the drive gear 39a are integrated. Further, similarly to the first embodiment, the rotating arm 6 is rotatably mounted on the mounting member 5, and further, the pressing arm 7 and the operation lever 8 are mounted. However, a driven gear 39b (not shown) is used instead of the driving gear 9a in the first embodiment.

In the wheelchair 31 as well, when approaching the step D, the front wheel 3 is mounted on the upper step surface DU and the rear wheel 4
The control lever 8 is lifted up in a state where the rear wheel 4 is in contact with the rising surface DT so that the driven gear 39b meshes with the drive gear 39a, and the traveling motor 34 is driven in a direction in which the rear wheel 4 rotates forward. As a result, the rear wheel 4 rotates forward and rises on the rising surface DT, and the turning arm 6 turns via the driving gear 39a and the driven gear 39b, so that the pressing arm 7 presses the lower surface DD and the wheelchair body 2a Push up diagonally forward and upward. Therefore, since the wheelchair main body 2 is lifted by utilizing a part of the driving force of the traveling motor 34, no burden is applied to the occupant,
In addition, the wheelchair body 2 can be easily raised to the upper surface DU.

In the third embodiment, the example in which the wheelchair attachments 32 and 33 are mounted on the ready-made electric wheelchair 31 has been described. It goes without saying that a wheelchair equipped with the lever 8 and the like may be manufactured. Also,
In the present embodiment, the drive mechanism 39a is used as the gear mechanism 39.
Although the example using the driven gear 39b has been described, another gear mechanism may be used. It is preferable that the traveling motor 34 be capable of rotating at a low speed and a large torque in consideration of the time when the vehicle climbs the step D. Further, instead of the operation lever 8, a drive gear 39 directly connected to the traveling motor 34 is provided.
By providing a clutch mechanism interposed between a and the driven gear 39b and connecting them when desired, the operability can be further improved. In this case, the clutch, the traveling motor, the operation switch of the traveling motor, and the like correspond to the operation means of the rotating arm 6.

In the above, the present invention is applied to the first, second, and third embodiments.
Although described in connection with No. 3, the present invention is not limited to the above embodiment, and it goes without saying that the present invention can be appropriately modified and applied without departing from the gist of the present invention. For example, in the above-described second embodiment, a gear without a gear mechanism for rotating the rear wheel forward is shown. However, it may be configured to include a rear wheel forward rotating means. Conversely, similarly to the first embodiment, a wheelchair that raises the operation lever when climbing a step may not have a gear mechanism.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a wheelchair according to a first embodiment.

FIG. 2 is an exploded perspective view of the wheelchair attachment according to the first embodiment.

FIG. 3 is an enlarged view of an attachment mounting portion of the wheelchair according to the first embodiment.

4 is a sectional view taken along the line IV-XY-IV in FIG. 3;

FIG. 5 is a diagram illustrating a state where the wheelchair according to the first embodiment is on a flat ground.

FIG. 6 is a diagram showing a state in which a front wheel of the wheelchair according to the first embodiment has climbed on an upper surface of a step portion.

FIG. 7 is a view showing a state in which the rear wheel of the wheelchair according to the first embodiment is in contact with the rising surface of the step portion.

FIG. 8 is a diagram illustrating a state where the rear wheel is lifted by the action of the pressing arm of the wheelchair according to the first embodiment.

FIG. 9 is a diagram illustrating a state in which the wheelchair according to the first embodiment is placed on the upper surface of the step portion.

FIG. 10 is a side view of the wheelchair according to the second embodiment with a rear wheel removed.

FIG. 11 is a view showing a state in which an operation lever, a rotating arm, and a pressing arm are operated according to the second embodiment.

FIG. 12 is a diagram illustrating a wheelchair attachment according to a third embodiment.

[Explanation of symbols]

1,21,31 Wheelchair 2 Wheelchair body 3 Front wheel 4 Rear wheel 4S Axle axis of rear wheel 5,25A, 25B Mounting member 6,26 Rotating arm 6S, 26S Rotating axis of rotating arm (first rotating axis) 7, 27 pressing arm 7S, 27S Rotating axis (second rotating axis) of pressing arm 8, 28 Operating lever (rotating arm operating means) 9, 39 Gear mechanism (rear wheel front rolling means) 9a, 29a, 39a Drive gear 9b, 29b, driven gear 10, 11, 22, 23, 32, 33 Wheelchair attachment

Claims (4)

[Claims] 1. A wheelchair main body, a front wheel mounted on a lower front side of the wheelchair main body, a rear wheel located rearward from the front wheel, and a second wheel parallel to an axle of the rear wheel with respect to the wheelchair main body. 1
A rotation arm mounted to be rotatable about an axis of the rotation shaft, the rotation arm extending obliquely upward and rearward from the first rotation shaft; and a rotation arm operation for rotating the rotation arm. Means, and a pressing arm rotatably supported on an axis of a second rotation axis parallel to the axle of the rear wheel at a portion of the rotation arm obliquely above and behind the first rotation axis. And
One end of the pressing arm contacts the ground behind the rear wheel when the tip of the rotating arm is moved obliquely rearward and downward, and presses the ground obliquely downward and rearward at the ground contact point. A wheelchair comprising: a pressing arm. 2. The wheelchair according to claim 1, wherein the rotating arm is rotated by the rotating arm operating means, and the pressing arm presses a ground contact surface at one end thereof. A wheelchair provided with a rear wheel forward rotation means for rotating the rear wheel forward. 3. A wheelchair having a wheelchair main body, a front wheel mounted on a front lower side of the wheelchair main body, and a rear wheel located behind the front wheel, comprising a lower surface and an upper surface. At the step, the front wheel rides on the upper surface, the rear wheel touches the lower surface, and the wheelchair is positioned so as to approach or contact the rising surface of the step, At the rear, the lower surface is pressed obliquely downward and rearward to push the wheelchair body obliquely upward and forward, and as the wheelchair advances, the push-up angle is reduced while maintaining the pressing position of the lower surface. A wheelchair comprising: push-up means; and rear-wheel forward rotation means for rotating the rear wheel forward in parallel with the push-up of the wheelchair. 4. A wheelchair attachment mounted on a wheelchair comprising a wheelchair main body, a front wheel mounted on a lower front side of the wheelchair main body, and a rear wheel positioned rearward from the front wheel. In contrast, the first parallel to the rear wheel axle
A rotation arm mounted to be rotatable about an axis of the rotation shaft, the rotation arm extending obliquely upward and rearward from the first rotation shaft; and a rotation arm operation for rotating the rotation arm. Means, and a pressing arm rotatably supported on an axis of a second rotation axis parallel to the axle of the rear wheel at a portion of the rotation arm obliquely above and behind the first rotation axis. And
One end of the pressing arm contacts the ground behind the rear wheel when the tip of the rotating arm is moved obliquely rearward and downward, and presses the ground obliquely downward and rearward at the ground contact point. A wheelchair attachment comprising: a pressing arm.