JP2003126173A - Wheel installation structure of wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel installing structure which facilitates easy connection and removal of the wheel. SOLUTION: A wheel installation section 13 of the wheelchair 1 is provided with shaft holes 14A, 14B, 14C, 14D, a shaft pipe 16A of wheels 15 inserted through the shaft hole 14B, and an axle shaft 17 inserted through the central shaft pipe 16A. On a root edge of an axle shaft 17, a cam lever 18 of cam shape 18A in its root edge is pivotally attached, on a screw groove part 17A formed at the tip end, a nut 21 is fixedly screwed. In this construction, the rotating cam lever 18 causes the side of the wheel installation part to be pushed by the root edge shape 18A of the cam lever 18, and the axle shaft 17 to be pulled to the cam lever 18 by the repelling force, so that the wheel axis part is tightened with the nut 21. By rotating the cam lever to loosen, the nut 21 can be easily unscrewed and removed from the wheel axle 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel mounting structure applied to a wheelchair.

[0002]

2. Description of the Related Art Conventionally, in a wheel mounting structure for a wheelchair, an axle (97) is extended from a wheel mounting portion (93) to
Insert the nut (91) into the central shaft cylinder (16A) of the wheel (15) and screw the nut (91) into the screw groove (97A) at the tip of the axle (97) to fasten the wheel (15). Was.

[0003]

In the wheel mounting structure for the wheelchair described above, the nut (91) needs to be strongly tightened, and the wheel (15) is not easily attached and detached, which is a labor-intensive problem. There is a point.

[0004]

Means for Solving the Problems The present invention is, as a means for solving the above-mentioned conventional problems, a wheel mounting portion of a wheelchair (1).
A shaft hole (14A, 14B, 14C, 14D) is provided in (13), and the shaft hole (14A, 14B
(B, 14C, 14D) through which the central axle cylinder (16A) of the wheel (15) is inserted, and further the axle (17) is inserted through the central axle cylinder (16A), and the root of the axle (17) is A cam lever (18) having a cam shape (18A) is pivotally attached to the end, and a screw groove (1
The nut (21) is screwed onto (7A) and the cam lever (18) is turned to the tightening side so that the cam shape (18A) at the root end of the cam lever (18) causes the side surface of the wheel mounting portion (13) to move. (EN) A wheelchair wheel mounting structure in which the axle (17) is pushed and pulled by the reaction force toward the cam lever (18). Further, a plurality of shaft holes (14A, 14B, 14C, 14D) of the wheel mounting portion (13) are provided, and one of the plurality of shaft holes (14A, 14B, 14C, 14D) should be selected. It is also possible to mount the axle (17) so that the position can be adjusted.

[0005]

[Operation] To attach the wheel (15) to the wheel mounting portion (13), the central shaft tube (16A) of the wheel (15) is inserted into the shaft holes (14A, 14B, 14C, 14D) of the wheel mounting portion (13). The axle (17), and insert the axle (17)
6A), and the nut (21) is screwed to the screwing portion (17A) at the tip of the axle (17). Then, when the cam lever (18) is rotated to the tightening side, the side surface of the wheel mounting portion (13) is pressed against the root end cam shape (18A) of the cam lever (18), and the reaction force of the side surface of the axle (1)
7) is pulled toward the cam lever (18), and the nut (21) tightens and fixes the central shaft cylinder (16A) of the wheel (15).

To remove the wheel (15) from the wheel mounting portion (13), rotate the cam lever (18) to the loosening side and the nut
Tightening of (21) is loose and nut (21) can be easily turned to
It can be removed from 7).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described with reference to one embodiment shown in FIGS. 1 to 9. The body (2) of a wheelchair (1) comprises a pair of left and right side frames (3, 3). (3,3) is from the seat beam (4), front and rear pedestal (5,6), armrest (7), back column (8), footrest support beam (9), and lower beam (10). The side frames (3, 3) are connected by a pair of front and rear X frames (11, 12).

A square tube-shaped wheel mounting portion (13) shown in FIG. 3 is welded to the rear pedestal portion (6) of the side frame (3). The wheel mounting portion (13) is provided with a plurality of shaft holes (14A, 14B, 14C, 14D) in the vertical direction (four). Main wheel (15) on the wheel mounting portion (13)
To install the wheel hole (14A, 14, B,
14C, 14D) and select the central shaft tube (16A) extending from the hub (16) of the main wheel (15) through the handbrake shoe housing (20A, 20B). (14), and the axle (17) is inserted into the central shaft cylinder (16A). The axle (1
A cam lever (18) is pivotally attached to the root end of (7), a cam shape (18A) is formed at the root end of the cam lever (18), and the cam lever (18) is further attached to the cam lever side of the axle (17). Press washers (19)
Are fitted. A concave curved surface along the cam shape (18A) of the cam lever (18) is provided on the cam lever side surface of the press washer (19).
(19A) is formed.

As mentioned above, the shaft hole (14
A, 14B, 14C, 14D) and handbrake shoe housing
Insert the central shaft cylinder (16A) into (20A, 20B), and
Insert the axle (17) into (A), and insert the screw thread (17) at the tip of the axle (17).
Screw the nut (21) onto A). At this time, the nut (21) does not need to be strongly tightened.

In this state, when the cam lever (18) of the axle (17) is rotated in the tightening direction as shown in FIG. 4, the cam shape (18A) of the cam lever (18) causes the press washer (19) to intervene. Presses the side surface of the wheel mounting portion (13), and the nut (21) screwed to the axle (16) tightens the shaft portion of the main wheel (15) by its reaction force (arrow B in FIG. 4). The hub (16) is attached to the cam lever (1
The main wheel (15) is fixed by being pulled in the 8) direction. The press washer (19) is not always necessary, but the press washer (1
By interposing 9), the wheel mounting portion (13) can be pressed more reliably.

Thus, the main wheel (15) is attached to the wheel mounting portion.
By selecting one of the shaft holes (14A, 14B, 14C, 14D) of (13) so that the mounting position can be adjusted in the vertical direction, it can be mounted by selecting the lower shaft hole (14). The height of the wheelchair (1) becomes lower, and the height of the wheelchair (1) becomes lower if the higher shaft hole (14) is selected.

Therefore, when it is desired to change the height of the wheelchair, the cam lever (18) of the axle (17) is rotated to the loosening side as shown in FIG. The nut (21) can be easily rotated and removed from the axle (17).

A caster mounting cylinder (22) shown in FIG. 6 is welded to the front leg post (5) of the side frame (3). The cylinder (2
2) Inside the base of the caster fork (23) (2
3A) is inserted with a shaft rod (25) erected via a hexagonal seat (24), and a washer (26) and a pair of upper and lower rubber sleeves (27, 28) are inserted in the shaft rod (25). Two washers (29, 30) are fitted and interposed between the pair of rubber sleeves (27, 28).

From above, a cap nut (32) having a handle (32A) formed at the upper end through a spacer (31) is provided with a screw groove (25A) formed at the upper end of the shaft rod (25). ), The cap nut (32) vertically compresses a pair of upper and lower rubber sleeves (27, 28) between the washer (26) and the washer (26), and the rubber sleeves (27, 28) are radially compressed. When expanded, the shaft rod (25) and the inner peripheral wall of the mounting cylinder body (22) are pressed into contact with each other, and the shaft rod (25) of the fork (23) is fixed in the cylinder body (22).

From the lower surface of the hexagonal seat (24) of the shaft rod (25), as shown in FIG.
As shown in Fig. 5, the lower shaft rod (33) is extended, and the lower shaft rod (33) is an upper bearing (34) inscribed in the base end portion (23A) of the fork (23), Intermediate ring (36), lower bearing
The nut (37) is screwed into the lower end screw groove (33A) through the (35), and thus the fork (23) is attached to the lower shaft rod.
It is attached to (33) so that it can rotate left and right.

The fork (23) has a shaft hole (3
8A, 38B, 38C) are provided in the longitudinal direction (3 pieces), and one of the shaft holes (38A, 38B, 38C) is selected, and as shown in FIG. A similar axle (39) with a cam lever (40) and a press washer (43), and a tip groove portion (39A) of the axle (39).
A caster wheel (42), which is an auxiliary wheel, is attached by a nut (41) screwed to the box so that the vertical mounting position can be adjusted.

Further, when the spacer (31) is positioned at the lower end of the mounting tube (22) as shown in FIG. 9, the fork (23) can be lowered by the thickness h of the spacer (31). The vertical position adjustment of the caster wheels (42) is performed corresponding to the position adjustment of the main wheels (15).

A footrest support post (51) is attached to the lower end of the footrest support beam portion (9, 9) by a shaft rod (47) with a cam lever (48) similar to the main wheel (15).

As shown in FIG. 10, the footrest support post (51) is a cylindrical long tube, the tip of which is cut into a taper shape, and a side branch portion (51A) is extended from the root end portion of the side branch portion.
A footrest (46) is attached to (51A). The cam lever shaft (47) attaches to the footrest support post (5
It is inserted and penetrated in the cylinder of 1), and the fixing nut (52) is screwed through the tip screw groove portion (47A). Further, the footrest support post (51) is inserted inside the frame of the footrest support beam (9). The fixing nut (52) is cut into a taper shape that opposes the taper shape of the tip of the footrest support post (51), and is screwed with the taper surfaces aligned. Also, press washer (49) on the root end of cam lever (48).
Is pierced through.

In this way, the footrest support post (5
1) Hold the cam lever (48) by hand and loosen the cam lever (48) (see Fig. 1).
When it is rotated clockwise by the one-dotted line, the shaft rod (47) also rotates. On the other hand, the fixing nut (52) is the footrest support post (51).
Since it is regulated by the tapered surface of and does not rotate, the fixing nut (5
2) is screwed deeply into the shaft rod (47). Then, when the footrest support post (51) is pressed, the footrest support post (51) and the fixing nut (52) are forced to move along the tapered surfaces (Fig. 10C and D).
The footrest support post (51) and the fixing nut (52) are pressed against the inner peripheral wall of the frame (9A) so that the footrest support post (51) is fixed in the footrest support beam (9). To be done.

In this way, the footrest support post (51) is fixed to the footrest support beam (9) at one end, and after positioning the cam lever (48) and the footrest support post (9), the cam lever (48) is reversed. Rotate slightly to the side,
Make the footrest support post slide. When the cam lever (48) is rotated to the tightening side (solid line in FIG. 11) in this state, the press washer (49) presses the footrest support post (51) in the direction of the fixing nut (52) (direction of FIG. 10B), The footrest support post (51) and the fixing nut (52) are subjected to the force to move along the tapered surface as described above (FIG. 10C and D), and the footrest support post (51).
Is fixed in the footrest support beam (9).

When the cam lever (48) is rotated to the loosening side (dotted line in FIG. 11), the press washer (49) is no longer pressed,
The pressure contact of the footrest support post (51) and the fixing nut (52) to the inner peripheral wall of the frame (9A) is also released, and the footrest support post (51) can be slid back and forth. Therefore, the footrest support post (51) can be loosened or fixed in the footrest support beam (9) with one touch by rotating the cam lever (48), and the position can be easily adjusted.

A seat cloth (43) is placed between the beam portions (4) of the pair of left and right side frames (3, 3), and a back cloth is placed between the back pillar portions (8).
(44) is passed over, and a handle is attached to the upper bent portion of the spine column (8).
(45) is installed.

Other than the above embodiment, a plurality of shaft holes of the wheel mounting portion may be arranged in the front-rear direction. In this case, the front and rear positions of the axle can be adjusted.

[0025]

According to the wheel mounting structure of the wheelchair of the present invention,
Wheels can be installed and removed very easily.

[Brief description of drawings]

1 to 11 show an embodiment of the present invention.

[Figure 1] Side view of wheelchair

[Figure 2] Wheelchair front view

FIG. 3 is an exploded perspective view illustrating a wheel mounting structure.

FIG. 4 is a sectional view of the wheel mounting structure in a tightened state.

[Fig. 5] Cross-sectional view of the wheel mounting structure in a loosened state

FIG. 6 is an exploded perspective view of the caster part explanation.

FIG. 7 is a partial cross-sectional view of a fork base end portion.

[Fig. 8] Front view of the caster wheels installed

FIG. 9 is a sectional view for explaining a height adjusting mechanism of a caster mounting cylinder.

FIG. 10 is an exploded perspective view of a state in which a footrest support post is attached.

FIG. 11 is a partial cross-sectional view illustrating a mounting state of a footrest support post.

FIG. 12 is a perspective view of a conventional wheel mounting structure.

[Explanation of symbols]

1 wheelchair 13 Wheel mount 14A, 14B, 14C, 14D shaft hole 15 wheels 16 shaft hole 17 axles 18 Cam lever 18A cam shape 19 press washers

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 25, 2001 (2001.10.
25)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

2. The wheel of a wheelchair according to claim 1, wherein a plurality of shaft holes are provided in the wheel mounting portion, and the position of the axle is adjusted by selecting one of the plurality of shaft holes. Mounting structure. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 6, 2001 (2001.11.
6)

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 7]

[Fig. 12]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 8]

[Figure 9]

FIG. 11

[Figure 10]

Claims (2)

[Claims] 1. A wheel mounting portion of a wheelchair, wherein a shaft hole is provided, a central shaft cylinder of a wheel is inserted through the shaft hole, and an axle is further inserted through the central shaft cylinder. Is a cam lever having a cam shape at its root end, and a nut is screwed to a screw groove formed at the tip end, and the cam lever is turned to the tightening side to rotate the cam lever toward the tightening side. A wheel mounting structure for a wheelchair, characterized in that a side surface of a mounting portion is pressed and the reaction force pulls the axle toward a cam lever. 2. A wheelchair according to claim 1, wherein a plurality of shaft holes are provided in the wheel mounting portion, and the position of the axle is adjusted by selecting one of the plurality of shaft holes. Wheel mounting structure.