JPH08299388A - Wheel chair - Google Patents

Abstract

PURPOSE: To freely ascend and descend a step part with no assist. CONSTITUTION: A pair of a first skid 7 and a second skid 8 each formed at its lower surface with at least one recessed step part, are arranged on opposite sides of the lower part of a body frame 1 so as to extend along the advancing direction of main wheels 2, and to be vertically swingable about a shaft transversely secured to the body frame 1. Thus, a part for moving on a step part, which is retractable above a plane defined the lowermost points of the main wheels 2 and an auxiliary wheel 4. Further, between the shaft of the main wheels 2 and a rotary drive transmission mechanism for reciprocally turns the first and second skids 7, 8 so that the vertical relationship of their bottom surface is alternately changed, a clutch for manually turning on and off the transmission of rotary power is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual wheelchair, and more particularly to a wheelchair suitable for moving on a step.

[0002]

2. Description of the Related Art Conventionally, various wheelchairs have been widely used by people with disabilities not only in hospitals but also on general roads and are well known. In this wheelchair, for example, a manual wheelchair generally includes a main body frame on which a user sits, two main wheels independently rotatably mounted on both sides of the main body frame, and these main wheels. An annular operation member provided on each side of each main wheel so as to be rotatable integrally with each main wheel, and supporting the main body frame without collapsing in cooperation with the main wheel, at least rotatably attached to the main body frame. It is configured with one turnable auxiliary wheel.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Generally, it is manufactured on the basis of flat road movement. However, in recent years, the number of places where wheelchair slopes are provided in hospitals or train stations has increased considerably, but there are many places with steps including stairs on roads, buildings or train stations. Then, the wheelchair user is forced to climb up and down the step with the help of the people around him in each case, and he is inconvenient.

The present invention has been made to solve the above-mentioned current situation, and an object of the present invention is to provide a wheelchair capable of freely ascending and descending even at a stepped place without assistance from others.

[0005]

In order to solve the above problems, the present invention provides a main body frame on which a user sits, and two main wheels independently rotatably mounted on both sides of the main body frame. A lower part of the main body frame, the manual wheelchair having at least one pivotable auxiliary wheel rotatably mounted on the main body frame, which supports the main body frame without tipping in cooperation with the main wheels. A first skid and a second skid, which extend along the traveling direction of the main wheel and are juxtaposed in the lateral direction, are provided on both sides of the main frame. Is formed so as to be tiltable up and down about an axis fixed in the lateral direction, so that it can be retracted above a plane defined by the lowest points of the main wheel and the auxiliary wheel. A rotary drive transmission mechanism for rotating the first and second skids relative to each other while maintaining the inclination of the first and second skids so that the vertical relations of the respective bottom surfaces can be alternately interchanged. A clutch for manually turning on / off the transmission of the rotational driving force is provided between the shaft and the rotational driving transmission mechanism.

[0006]

With the above-described structure, only the main wheels need to be rotated when moving on a flat road, and the first and second skids can maintain a constant inclination relative to each other only when moving on a step. Rotate to move the main body frame up and down and back and forth.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 13 show a manual wheelchair according to the present invention, in which a main body frame 1 on which a user sits, and two main wheels 2 independently rotatably attached to both sides of the main body frame 1, An annular operation member 3 (only the left one is shown for convenience in FIG. 1) provided on each side of each of the main wheels 2 so as to be rotatable integrally with each of the main wheels 2, and the main wheel 2
There is provided an auxiliary wheel 4 which is mounted on the body frame 1 so as to be pivotable, and thus freely changeable, in cooperation with it to support the body frame 1 without tipping.
It should be noted that in FIG. 1, the members of the sitting portion and the backrest portion of the main body frame 1 are omitted in order to make the drawing easy to see and because they are not an essential part of the present invention, but in reality, these members are omitted. Is attached.

Further, in this embodiment, the first skid 7 which is a fixed member and the second skid 8 which is a movable member having concave step portions 5 and 6 on the lower surface subjected to the non-slip process are arranged side by side in a lateral direction. 2 on both sides of the lower part of the main body frame 1 along the direction in which the main wheel 2 advances, and centered on a shaft 9 fixed laterally to the main body frame 1 in FIG.
It is provided so that it can be tilted up and down. Then, by tilting the first and second skids 7, 8 upward so that the front side of the wheelchair rises, above the plane defined by the lowest points of the main wheel 2 and the auxiliary wheel 4, that is, the main part. Only the pair of the first skid 7 and the second skid 8 forms a step moving portion 10 that can be retracted above the plane indicated by B in FIG.

In these two pairs, the manual lever 11 is shown in FIG.
By moving up and down as shown by arrow C in
It is designed to tilt up and down as a unit. Also, the second
The skid 8 is rotated by the rotary drive transmission mechanism 12 as shown in FIGS.
As indicated by the middle arrow D, the inclination can be maintained and the forward and reverse rotations can be made in a plane perpendicular to the horizontal axis 9. And
By interposing the clutch 13 in a mechanism for transmitting the rotation of the main wheel 2 to the rotary drive transmission mechanism 12 and manually operating the clutch 13, switching of rotation transmission from the main wheel 2 to the rotary drive transmission mechanism 12 can be switched. It is possible. Less than,
The structure and movement of each part will be described in more detail.

The manual lever 11 and the first and second skids 7,
A gas spring push-lock type telescopic cylinder 16 is interposed between the first and second skids 7, 8 and thereby locks the pair of first and second skids 7, 8 at an upward tilting position. 8 is formed so as to be stably held. In the illustrated example, the telescopic cylinder 16 is unlocked by tilting the manual lever 11 downward and rotates counterclockwise so that the first and second skids 7 and 8 have their front end portions. When the manual lever 11 tilts upward and reaches the position shown by the chain double-dashed line in FIG. 2, the telescopic cylinder 16 is tilted downward by its own weight so as to lower the Rotates in the clockwise direction, the first and second skids 7, 8 tilt upwards to be in a locked state, and are in a flat ground moving state.

The rotary drive transmission mechanism 12 includes a drive pulley 21, a driven pulley 22, an auxiliary pulley 23, and a first winding rotation transmission portion 25 formed of a toothed belt 24 wound around these, and a driven pulley 22. A toothed drive pulley 26 (in FIG. 2,
(Because it appears in duplicate with the driven pulley 22, it is also shown in parentheses below the member number 22), a driven pulley 27 also having teeth, an auxiliary pulley 28, and an auxiliary pulley 29 having no teeth and windings around these. It is composed of a second winding rotation transmission section 31 formed of a belt 30 with a tooth attached. Then, the driven pulley 22 and the drive pulley 26 rotate forward and backward by the forward and reverse rotation of the drive pulley 21, and the driven pulley 27 rotates forward and reverse by the forward and reverse rotation of the drive pulley 26.

The shaft 32 of the drive pulley 21 is rotationally driven from the main wheel 2 via the clutch 13.
The clutch 13 will be described later. In addition to the shaft 32,
The driven pulley 22, the shaft 9 of the drive pulley 26 and the auxiliary pulley 23 are supported by the main body frame 1, and the shaft 33 of the driven pulley 27 and the auxiliary pulleys 28, 29 are supported by the first skid 7. There is. Further, the shafts 9 and 33 are provided with shafts 34 and 35 that rotate around the shafts 9 and 33 at positions eccentric from the shafts 9 and 33.
5 supports the second skid 8. Therefore, when the shaft 32 is rotationally driven and the drive pulley 21 rotates,
The driven pulley 22 and the drive pulley 26 rotate, and when the drive pulley 26 rotates with its shaft 9, the driven pulley 27 rotates with its shaft 33. The rotation of each of these pulleys does not actuate the first skid 7 and is in a fixed state.

On the other hand, the rotation of the shaft 9.33 causes the shaft 9.33 to rotate.
The shaft 34.35 at an eccentric position pivots about the center, and the second skid 8 does not change its tilted state, and as shown by the arrow D in FIG. Moreover, it is possible to move in a place with a step by making a rotary motion. In FIG. 2, the protruding shaft 3
The disk having 4, 35 overlaps the drive pulley 26 and the driven pulley 27.

FIGS. 4 to 8 sequentially show the state in which the step S rises as the second skid 8 rotates with respect to the first skid 7. Of these, FIG. 4 shows an initial state in which only the first skid 7 contacts the step S. When a pair of the first and second skids 7 and 8 are tilted downward by operating the manual lever 11 when coming to a place having a step from a flat road, the state shown in FIG. 4 is usually present. 5 to 7, in place of the first skid 7, the second
It is shown that the skid 8 comes into contact with the step S and the first skid 7 advances diagonally upward to the left with respect to the second skid 8, that is, with respect to the step S. When the first skid 7 advances, the main body frame 1 in an integrated state with the first skid 7 also advances diagonally upward to the left.
Then, FIG. 8 shows that the positional relationship between the first skid 7 and the second skid 8 has returned to the same state as in FIG. 4, and thereafter, by repeating the above operation, the stepped portion S is raised in the rearward facing state. Go on.

On the contrary, when going down the step S, the state changes from the state shown in FIG. 8 to the state shown in FIG. 4 and goes forward. Next, the clutch 13 will be described. As shown in FIGS. 9 to 13, the clutch 13 includes a hub portion 41 that rotates integrally with the main wheel 2 at the center of the main wheel 2, and a skid drive shaft side rotation portion 42 that rotates integrally with the shaft 32. , The hub portion 41 and the skid side member 42
And an operation unit 43 that intervenes between the transmission and the rotation of the rotary drive. The hub portion 41 is composed of a set metal fitting 44 and a split metal fitting 45 which is provided by bolting two members having a semicircular cross section so as to surround the shaft 32. The hub portion 41 has a shaft 32 at the center thereof. Is pierced so that it can rotate relatively freely. Also, this axis 3
A plurality of pins 46 are projected on the end surface portion of the set metal fitting 44 surrounding the two end portions at appropriate intervals along the circumference.

A clutch shaft 47 having a circular cross section is provided at the end of the shaft 32 of the skid drive shaft side rotating portion 42. The operation portion 43 includes a hub portion 41 and a clutch shaft 47.
The pin receiving holder 48 has a tubular portion that is fitted in the annular space between and so as to be movable in the axial direction, and the handle 49 integrally attached to the pin receiving holder 48. The cylindrical portion of the pin receiving holder 48 is provided with a pin receiving hole 50 into which the pin 46 is fitted. Further, a bolt 51 is provided which penetrates the central portion of the pin receiving holder 48 and is screwed into a screw hole formed in the end surface of the clutch shaft 47.

Then, by pulling the handle 49 away from the hub portion 41, the pin 46 is disengaged from the pin receiving hole 50, as shown in FIG. 10, and the hub portion 41 and the main wheel 2 rotating integrally therewith. From the operating unit 43 and the skid drive shaft side rotating unit 42 which rotates integrally with the operating unit 43, the rotary drive is cut off. Therefore, in this state, the second skid 8 does not operate with respect to the first skid 7, and is kept in this state when moving on a flat road. The bolt 51 has a function of defining a leftward movement limit when the handle 49 is pulled leftward in FIG.

Next, by pushing the handle 49 toward the hub portion 41, as shown in FIG. 11, the pin 46 is fitted into the pin receiving hole 50, and the hub portion 41 and the main wheel that rotates integrally with the hub portion 41. From 2 the transmission state of the rotational drive to the operation unit 43 and the skid drive shaft side rotation unit 42 that rotates integrally with the operation unit 43 is turned on. Note that the cross-hatched portions in FIG. 11 indicate that they rotate integrally. Therefore, when the main wheel 2 is rotated in this state, the second skid 8 is simultaneously rotated with respect to the first skid 7, and this state is set when the step portion is moved.

In the above embodiment, the first skid 7 is the fixed member and the second skid 8 is the movable member. However, the present invention is not limited to this.
Both the second skids 7 and 8 may be movable members, and the relative movements of the first and second skids 7 and 8 may be the same as in the above embodiment. Further, in the above embodiment,
Although a manual wheelchair is shown, the invention is not so limited and includes an electric wheelchair.

[0020]

As is apparent from the above description, according to the present invention, the main body frame on which the user sits, and the two main wheels independently rotatably mounted on both sides of the main body frame, In a manual wheelchair having at least one auxiliary wheel rotatably attached to the body frame, which cooperates with the main wheels to support the body frame without tipping, each of the lower sides of the body frame. The first skid and the second skid, which extend along the direction in which the main wheel advances and are arranged side by side in the lateral direction, and the first skid and the second skid are laterally arranged on the body frame. By forming a tiltable portion up and down about a fixed shaft, a step moving portion is formed so as to be retractable above the plane defined by the lowest points of the main wheel and the auxiliary wheel. A rotary drive transmission mechanism is provided for rotating the first and second skids relative to each other while maintaining their respective inclinations and allowing the vertical relationships of the respective bottom surfaces to be alternately interchanged. A clutch is provided between the transmission mechanism and the transmission mechanism to manually turn on / off the transmission of the rotational driving force.

Therefore, it is sufficient to rotate only the main wheel when moving on a flat road, and only when the step portion moves.
The skids are rotated while maintaining a constant inclination relative to each other, and the main body frame is moved up and down and moved forward and backward, so that it is possible to move up and down freely even in the presence of steps without assistance from others.

[Brief description of drawings]

FIG. 1 is a perspective view of a wheelchair according to the present invention.

FIG. 2 is a side view showing only a main part of a rotation drive transmission mechanism in the wheelchair shown in FIG.

FIG. 3 is a partial perspective view schematically showing a rotary drive transmission mechanism in the drive shown in FIG.

FIG. 4 is a diagram showing the movement of the second skid with respect to the first skid when the step portion moves in the drive shown in FIG.

5 is a diagram showing the movement of the second skid with respect to the first skid when the step portion of the wheelchair shown in FIG. 1 is moved.

FIG. 6 is a diagram showing the movement of the second skid with respect to the first skid when the step portion of the wheelchair shown in FIG. 1 is moved.

FIG. 7 is a diagram showing the movement of the second skid with respect to the first skid when the step portion of the wheelchair shown in FIG. 1 is moved.

FIG. 8 is a diagram for explaining the movement of the second skid with respect to the first skid when the step portion of the wheelchair shown in FIG. 1 is moved.

9 is a partial cross-sectional view of the main wheel of the wheelchair shown in FIG.

10 is a sectional view of the wheelchair shown in FIG. 1 in a disengaged state of the clutch.

11 is a cross-sectional view of the wheelchair shown in FIG. 1 when the clutch is engaged.

FIG. 12 is a front view of a metal fitting for setting the hub portion of the wheelchair shown in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

 1 Body Frame 2 Main Wheel 4 Auxiliary Wheel 5, 6 Concave Step 7 First Skid 8 Second Skid 9 Shaft 10 Step Moving Part 12 Rotational Drive Transmission Mechanism 13 Clutch

Claims (1)

[Claims] 1. A main body frame on which a user sits, two main wheels independently rotatably attached to both side portions of the main body frame, and the main frame cooperating with the main wheel to invert the main body frame. A wheelchair with at least one swivel auxiliary wheel rotatably mounted on the body frame, without any support, extending on each side of the lower part of the body frame along the direction of travel of the main wheel. A first skid and a second skid, which are arranged side by side in the horizontal direction, and are formed so as to be vertically tiltable about an axis laterally fixed to the main body frame. Is provided with a step moving portion formed to be retractable above the plane defined by the lowest points of the main wheel and the auxiliary wheel, and the inclinations of the first and second skids are maintained. In this state, a rotary drive transmission mechanism that relatively rotates so that the vertical relationship of each bottom surface can be alternately interchanged is provided, and the rotation drive force of the rotary drive force is manually provided between the main wheel shaft and the rotary drive transmission mechanism. A wheelchair characterized by being formed by providing a clutch for turning on and off transmission.