JPH0515554A - Spindle mounting construction of wheel chair - Google Patents

Abstract

PURPOSE:To enable the adjustment of position accurately even in the longitudinal direction along with fine vertical adjustment of the position of a spindle. CONSTITUTION:A plurality of fixing holes are cut horizontally into a vertical frame 1a provided on a body frame 1 at a specified interval to anchor a fixing plate 5 and a slot 5a is formed horizontally in the fixing plate 5 to insert the spindle 4 therethrough while fixing holes 5b and 5c are cut at both side ends thereof to match the fixing hole 6 of the vertical frame. Moreover, a number of grooves 5d and formed at upper and lower rim parts of the fixing plate 5 at a fixed pitch so as to have a protrusion 10a of a washer 10 with the protrusion engaging them. The fixing plate 5 is anchored with a fixing screw inserted through the fixing hole thereof and a fixing hole of the vertical frame. The spindle 4 is fixed being clamped on the fixing plate with a nut as inserted through the slot 5a of the fixing plate 5 with the protrusion washer 10 while the protrusion 10a of the washer with the protrusion is engaged with upper and lower grooves 5d of the fixing plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle mounting structure for rotatably supporting a wheel of a wheelchair so that a spindle is adjustably mounted on a body frame.

[0002]

2. Description of the Related Art Wheelchairs must be manufactured for each user by determining the length and width of the frame, the position of the main shaft, the size of the wheels, etc., according to the physique and condition of the user. Is the best.

However, in order to manufacture an order-made wheelchair according to the physique of the user, the shape and size of each part including the frame must be determined and processed according to the physique of the user. Therefore, it takes a lot of time and man-hours to manufacture a wheelchair, and it is impossible to manufacture a wheelchair efficiently and at a reasonable cost.

For this reason, there has been proposed a wheelchair having a structure in which the vertical position and front-back position of a main shaft for determining the height and stability of the wheelchair can be adjusted (for example, actual flat plane 1-8462).
No. 6).

[0005]

In this wheelchair, a fixing plate for fixing the main shaft of a wheel is provided with a long hole, and the main shaft is fitted and fixed in the long hole so that the main shaft can be positionally adjusted, or the fixing plate is fixed. A large number of fixing holes are formed in the fixing portion of the main body frame, and by changing the fixing holes, the position of the fixing plate can be adjusted stepwise, and the position of the main shaft can be adjusted up and down or back and forth.

However, in the structure for mounting the main shaft of the wheelchair of this type, in which the main shaft is fitted and fixed in the elongated hole such that the position of the main shaft can be adjusted, when the tightening screw loosened by fitting the main shaft into the elongated hole, The position of the main shaft is easy to change, and in the case where a large number of fixing holes are drilled in the body frame, the position can be adjusted only by the intervals of the fixing holes, and the intervals of the fixing holes are narrowed to make the adjustment width fine. Then, there is a problem that the strength of the main body frame is reduced.

The present invention has been made in order to solve the above problems, and provides a main shaft mounting structure for a wheelchair, which can finely adjust the position of the main shaft in the vertical direction and can also surely adjust the position in the front-rear direction. The purpose is to provide.

[0008]

To this end, the main shaft mounting structure of the present invention is a structure in which a main shaft for rotatably supporting a wheel of a wheelchair is mounted to a main frame by a vertical shaft provided on the main frame. In the frame, a plurality of fixing holes for fixing the fixing plate are vertically provided at predetermined intervals horizontally, and the fixing plate is formed with horizontally long holes through which the spindle is inserted, and at both end portions thereof. The fixing hole is formed in accordance with the fixing hole of the vertical frame, and further, a large number of grooves with which the protrusions of the washer with protrusions are engaged are formed at a fixed pitch on the upper edge and the lower edge of the fixing plate, The fixing plate is fixed by passing the fixing screw through the fixing hole and the fixing hole of the vertical frame, and the main shaft is inserted in the long hole of the fixing plate, and the washer with the protrusion is inserted and the protrusion of the washer with the protrusion is fixed. Fixed with nuts while engaging the upper and lower grooves It is fixed by tightening, and the center position of the long hole of the fixing plate is displaced from the center position between the fixing holes of the fixing plate by a predetermined distance, and the center position of the protrusion of the washer with protrusion is set to the center position of the washer with protrusion It is constructed by shifting the distance.

[0009]

In such a wheelchair, when changing the height of the main shaft, the fixing plate is removed from the vertical frame and the fixing position is changed, but the center position of the long hole of the fixing plate is between the fixing holes of the fixing plate. Since it is formed with a predetermined distance from the center position of the, the vertical position of the fixing plate can be changed step by step while flipping the fixing plate upside down. The vertical position of the fixed plate can be changed at half the interval.

When the front and rear positions of the main spindle are changed, the tightened state of the main spindle which is fitted and tightened in the long hole of the fixing plate is loosened, and the washer with the projection which is fastened together with the main spindle is turned upside down. The protrusions are again engaged with the grooves at the upper and lower edges of the fixing plate, and the screws are fixed again by tightening. Since the center position of the protrusion of the washer with protrusion is formed to be displaced from the center position of the washer with protrusion by a predetermined distance, while turning the washer with protrusion upside down,
By changing the front-rear position one step at a time, the front-rear position of the main shaft can be changed with a half pitch of a large number of grooves provided on the upper and lower edges of the fixed plate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a right side view of a wheelchair, in which 1 is a main frame having a pipe frame structure, 2 is wheels, and 3 is casters. A main shaft 4 that rotatably supports the wheel 3 of the wheelchair is fixed to a fixed plate 5 fixed between the vertical frames 1a and 1b of the main body frame 1 so that the front and rear positions can be adjusted.

As shown in FIG. 2, a large number of fixing holes 6 are vertically formed in the vertical frames 1a and 1b of the main body frame 1 at equal intervals of pitch P1. The interval of this pitch P1 is
For example, it is set to 20 mm, and is an interval at which the strength of the vertical frames 1a and 1b can be sufficiently maintained.

As shown in FIG. 5, the fixing plate 5 for fixing the main shaft is formed with a long hole 5a for inserting and fixing the main shaft 4 horizontally in a substantially central portion thereof, and further, two pairs of holes are formed on both sides thereof. Fixing holes 5b and 5c are formed. In particular, this fixing hole 5b,
In 5c, the central position C1 between them is the central position C2 of the long hole 5a.
It is arranged so as to be shifted downward by a predetermined distance (FIG. 5). For example, when the distance between the fixing holes 5b and 5c is 40 mm, the center position C1 is located 5 mm below C2.

Further, at the upper edge and the lower edge of the fixed plate 5,
The rectangular grooves 5d are arranged at intervals of the pitch P2 (for example, the groove width 7
mm, the width of the protrusions is 3 mm, and the pitch is 10 mm), and a large number are formed in the horizontal direction (FIG. 5). The positions of the grooves 5d at the upper edge and the lower edge correspond exactly to each other.

The fixing plate 5 constructed in this way is shown in FIG.
As shown in FIG. 3, the four fixing screws 7 are attached to the respective fixing holes 5b,
5c is passed through the fixing hole 6 on the vertical frame side and fixed by tightening. In order to protect the vertical frame made of aluminum pipe, washer members 8 are inserted on both sides of the vertical frame.

The fixing plate 5 shown in FIG. 2 includes vertical frames 1a and 1b.
Is the highest position, and the position of the main shaft, which will be described later and is inserted and fixed in the elongated hole 5a, is A1.

The main shaft 4 rotatably supporting the wheel 2 has a threaded portion formed on the outer periphery and is inserted into the long hole 5a of the fixing plate 5. Then, the nut 9 is screwed onto the tip of the main shaft 4, and the main plate 4 is clamped and fixed to the fixed plate 5 so that the fixed plate 5 is sandwiched between the inner nut and the nut 9.
A washer 10 with a projection having a shape as shown in FIGS. 6 and 7 is inserted inside the nut 9.

As shown in FIG. 6, the washer 10 with a protrusion has an inwardly bent protrusion 10a at its upper and lower portions, and the protrusion 10a is a groove 5d at the upper and lower edges of the fixed plate 5.
Is a shape that can be engaged with. Further, as shown in FIG. 6, the center position D2 of the protrusion 10a is displaced leftward from the vertical center position D1 of the washer 10 with protrusion by a predetermined distance (for example, 2.5 mm).

As shown in FIG. 2, the protrusion 1 of the washer 10 with protrusions
0a is fitted in the rightmost groove 5d of the fixed plate 5, and the main shaft 4
Is fixed to the fixed plate 5, the vertical center position B1 of the spindle 5
Is fixed at the rearmost position of the wheelchair.

Although the above description has been made on the spindle mounting portion of the wheel on the left side of the wheelchair, it goes without saying that the spindle is similarly mounted on the wheel on the right side.

In the wheelchair constructed as described above, when changing the height position of the main shaft 4, the four fixing screws 7 are removed and the mounting position of the fixing plate 5 is changed. When lowering from the position of 1 by one step, as shown in FIG. 9, the fixing plate 5 is turned upside down from the state of FIG. 2, and the fixing screw 7 is again inserted into the same fixing hole 6 and fixed to the vertical frames 1a and 1b.

That is, as shown in FIG. 5, since the center position C1 between the fixing holes 5b and 5c of the fixing plate 5 and the center position C2 of the elongated hole 5a are deviated by a predetermined distance (here, 5 mm),
Only by turning over the fixing plate 5, the long hole 5a, that is, the center position A2 of the spindle 4 is separated from the front center position A1 by a predetermined distance (here, 10).
mm) will be lowered. Then, the fixing plate 5 is turned upside down from the state shown in FIG. 9, that is, the state shown in FIG.
Align the fixing holes 5b and 5c with the fixing holes 6 on the lower step, and fix the fixing screws 7
By inserting and fixing, the center position of the spindle 4 is further lowered by a predetermined distance.

Thus, the fixing holes 5b, 5c of the fixing plate 5 are
Since the center position C1 between them and the center position C2 of the long hole 5a are deviated by 5 mm, even if the fixing holes 6 of the vertical frames 1a and 1b are provided at intervals of 20 mm, the fixing plate 5 has a width of 10 mm which is half of that. The main shaft 4 can be fixed while being displaced, and the vertical position of the main shaft 4 can be changed at intervals of 10 mm, that is, at intervals of half between the fixing holes 6.

On the other hand, when changing the position of the main shaft 4 back and forth, the nut 9 is loosened and the position of the main shaft 4 is shifted within the elongated hole 5a of the fixing plate 5, but the main shaft 4 is moved one step from the state of FIG. When it is moved forward, the nut 9 is loosened, the washer 10 with a protrusion is turned upside down, the protrusion 10a is fitted again in the same groove 5d, and the nut 9 is tightened and fixed. In this case, since the protrusion 10a of the washer 10 is engaged with and fixed to the groove 5d of the fixed plate 5, even if the main shaft 4 is inserted into the long hole 5a of the fixed plate 5,
The position of the main shaft 4 is securely fixed and does not shift.

As described above, the central position D2 of the protrusion 10a
Is a predetermined distance from the center position D1 of the washer 10 (here, 2.
Since it is offset by 5 mm), simply turning the washer 10 with protrusions up and down will cause the spindle 4 to be displaced forward by a predetermined distance (here, 5 mm), as shown in FIG. Then, if the washer 10 with protrusions is turned upside down from the state of FIG. 8 and the protrusion 10a is fitted into the groove 5d on the left side, the position of the main shaft 4 is further shifted forward by a predetermined distance.

As described above, since the center position D1 of the washer 10 with a protrusion and the center position D2 of the protrusion 10a are deviated by 2.5 mm, the pitch P2 of the grooves 5d of the fixed plate 5 is 10 mm.
Even if the washer is installed, the washer 10 can be fixed by shifting it with a width of 5 mm, which is half of that, and the front and rear position of the spindle 4 can be set to 5 mm.
The distance, that is, the width of the groove pitch P2 can be changed.

[0028]

As described above, according to the main shaft mounting structure for a wheelchair of the present invention, the vertical position and the front-back position of the main shaft are set to a half interval between a plurality of fixing holes provided in the vertical frame or a fixing plate. The pitch can be changed at half the pitch of a large number of grooves provided at the upper and lower edges, and the vertical and longitudinal positions of the main shaft can be finely adjusted without reducing the strength of the vertical frame and the fixing plate. The main shaft is fitted and mounted in the long hole of the fixed plate, but the position of the main shaft is not securely fixed because the protrusions of the washer with protrusions that are fastened together engage with the grooves in the upper and lower edges of the fixed plate. There is no such thing.

[Brief description of drawings]

FIG. 1 is a right side view of a wheelchair.

FIG. 2 is an enlarged front view of a spindle mounting portion.

3 is a sectional view taken along line III-III in FIG.

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

FIG. 5 is an enlarged front view of a fixing plate.

FIG. 6 is an enlarged front view of a washer with a protrusion.

FIG. 7 is a left side view of the same.

FIG. 8 is an enlarged front view of a state in which the main shaft is shifted forward by one step.

FIG. 9 is an enlarged front view showing a state where the main shaft is shifted downward by one step.

[Explanation of symbols]

1-body frame, 1a, 1b-vertical frame, 4-spindle, 5-fixing plate, 5a-long hole, 5b, 5c-fixing hole, 5
d-groove, 6-fixing hole, 10-washer with projection, 10a-projection.

Claims (1)

Claim: What is claimed is: 1. A main shaft mounting structure for mounting a main shaft for rotatably supporting a wheel of a wheelchair to a main frame, for fixing a fixing plate to a vertical frame provided in the main frame. A plurality of fixing holes are vertically formed at predetermined intervals horizontally, and long holes through which the main shaft is inserted are horizontally formed in the fixing plate, and fixing holes are formed at both side ends of the vertical frame. A large number of grooves are formed at a fixed pitch on the upper and lower edges of the fixing plate to fit the fixing holes, and the fixing plate is fixed to the fixing plate. The screw is fixed through the fixing hole and the fixing hole of the vertical frame, the main shaft is inserted into the long hole of the fixing plate, the washer with the protrusion is inserted, and the protrusion of the washer with the protrusion is fixed to the fixing plate. While engaging with the upper and lower grooves, the fixing plate with a nut It is fixed by tightening against it, and the central position of the elongated hole of the fixing plate is formed to deviate from the central position between the fixing holes of the fixing plate by a predetermined distance, and the central position of the protrusion of the washer with protrusion is the center of the washer with protrusion. A wheelchair main shaft mounting structure, which is formed so as to be displaced from a position by a predetermined distance.