JP6133251B2 - Wheelchair frame - Google Patents

Description

The present invention relates to a wheelchair frame in which a frame main body and a plurality of pipe members disposed on both sides of a wheelchair are fastened by fastening members .

Since the frame can ensure high strength and reduce the weight, a pipe member is often used as a member. The pipe members are connected to each other by welding because sufficient fastening strength can be secured.
However, in connection with welding, when one pipe member is damaged, it is not possible to replace only one pipe member while leaving the other pipe member intact. As a result, the entire frame must be replaced after all. Regarding the fastening structure for connecting pipe members to each other, as a structure that does not use welding, pipes are known, but those described in Patent Document 1 are known.

  In the joint for piping described in Patent Document 1, a joint body in which a pipe insertion portion is formed, a pipe member to be inserted into the pipe insertion portion, and can be fitted to the outer periphery of the end of the pipe insertion portion. The joint main body and the pipe member are fastened together by a sleeve having an inner diameter smaller than the outer diameter. This joint for piping deforms the pipe insertion part in the inner diameter direction by press-fitting the sleeve from the end of the pipe insertion part into which the pipe member is inserted and pressurizing it toward the inside of the joint body. Thus, the pipe insertion portion and the pipe member are integrally and tightly crimped together. Further, the sleeve that has been pressurized and moved toward the inside of the joint body is crimped and fixed onto the pipe insertion portion.

JP-A-6-249374

  In the joint for piping described in Patent Document 1, the pipe members can be fastened without using welding, but the outer diameter of the pipe member in the pipe insertion portion is reduced as the inner diameter of the pipe insertion portion is reduced by the squeezing force of the sleeve. Since the joint body and the pipe member are tightly and strongly joined and held together, the outer shape of the pipe member is deformed. Although it is conceivable to increase the thickness of the pipe member inserted into the pipe insertion part, changing the thickness of the pipe member only at the end results in a special pipe shape, increasing the thickness of the entire pipe member Therefore, the method of increasing the thickness of the pipe member is not suitable.

On the other hand, when the outer shape of the frame is deformed, the strength is biased due to concentration of stress at the deformed portion, and the overall strength is lowered. Therefore, it is difficult to apply the structure of the piping joint described in Patent Document 1 to a wheelchair frame in order to secure the strength of the frame.

Therefore, an object of the present invention is to provide a wheelchair frame that can give sufficient strength to a fastening portion without using welding.

The wheelchair frame of the present invention is a wheelchair frame in which a frame main body and a plurality of pipe members arranged on both sides of the wheelchair are fastened by fastening members, and the fastening member is a member of the pipe member. A relay member that press-fits to the outside of the end, and a cylinder part that is press-fit to the inside of the pipe member, and prevents the pipe member from being deformed inward by the pressing force of the sleeve member and the cylinder And an auxiliary member press-fitted inside the portion, and a fixing member connected to the frame main body .

According to the wheelchair frame of the present invention, the frame body disposed on both sides of the wheelchair and the plurality of pipe members are fastened by the fastening member , and the fastening member is press-fitted outside the end of the pipe member. A sleeve member that is press-fitted inside the pipe member, a relay member that prevents the pipe member from being deformed inward by the pressing force of the sleeve member, and an auxiliary member that is press-fitted inside the tube part. a fixing member connected to the frame body has, is provided with the, even when press-fitting the sleeve member from the outside to the pipe member, if the relay member such as not to cause the outer shape deformation, the pressing force of the sleeve member and to receive firmly the relay member, the pipe member is not deformed inwardly.

When a notch is formed at the end of the pipe member, when the sleeve member is press-fitted into the pipe member, the interval between the notches is reduced, the pipe diameter is reduced, and the relay member is press-fitted into the pipe member. In doing so, the notch is opened and the tube diameter is increased, so that the press-fitting can be facilitated.

If a pin member penetrating the sleeve member, the pipe member, and the relay member is provided, shaft rotation about the axis of the pipe member can be prevented.

The relay member is formed with a cylindrical part that is press-fitted into the pipe member, and an auxiliary member that is press-fitted inside the cylindrical part is provided. The cylindrical part that is press-fitted into the pipe member and formed hollow The strength of can be supplemented by the auxiliary member.

The relay member, the angle adjustment mechanism for changing the angle of the pipe member is formed, even if the angle adjustment is necessary as the wheelchair frame, if the wheelchair frame of the present invention, a pipe with an angle adjusting mechanism This can be dealt with by changing the angle of the member.

The present invention includes a frame body and a plurality of pipe members disposed on both sides of the wheelchair, is not required entered into because welded by press-fitting of the relay member and the sleeve member of the fastening member. Further, since the relay member firmly receives the pressing force of the sleeve member, the pipe member is not deformed inward, so that the fastening portion can have sufficient strength.

1 is a schematic side view of a self-propelled wheelchair having a wheelchair frame according to an embodiment of the present invention. It is a rear view of the self-propelled wheelchair shown in FIG. It is a figure of the edge part of the pipe member which is a structural member of the wheelchair frame of the self-propelled wheelchair shown in FIG. It is a figure for demonstrating fastening with the frame main body of the self-propelled wheelchair shown in FIG. 1, the pipe member for backrest, and the pipe member for seat footrests. It is a figure for demonstrating fastening with the frame main body of the self-propelled wheelchair shown in FIG. 1, and the pipe member for center part space | interval.

The wheelchair frame according to the embodiment of the present invention will be described with reference to the drawings, taking as an example a self-propelled wheelchair (hereinafter simply referred to as “wheelchair”) that is operated and moved by the user himself / herself. In the present specification, the front and rear of the user when sitting on the wheelchair will be described as the front and rear of the wheelchair.
The wheelchair 10 shown in FIG. 1 includes a large wheel 20, a front wheel 30, and a wheelchair frame 40. In FIG. 1, the backrest and the seat are not shown.

Large wheel 20 shown in FIG. 2, the rim 22 of the tire 21 is fitted, and a hand rim 23 the user rotates by holding, will be described later in detail of the wheelchair frame 40 via the hub shaft 24 It is attached to the frame body 50. The front wheel 30 shown in FIG. 1 is attached to the front end of a wheelchair frame 40 so as to be rotatable.

The wheelchair frame 40 has a structure in which a pipe member is fastened around a frame body 50 located on both sides of the wheelchair 10.
The pipe member includes a backrest pipe member 61, a seat leg pipe member 62, an armrest pipe member 63, a rear spacing pipe member 64, and a central spacing pipe member 65.

The backrest pipe member 61 is a straight pipe erected on the rear end portion of the frame main body 50 via a fastening member 51. A cap 71 that seals the opening is put on the tip of the backrest pipe member 61. Further, a backrest (not shown) is stretched between the pair of backrest pipe members 61.

The seat leg pipe member 62 is bent downward at the front end position of the frame main body 50 from the user's buttocks to the front end position of the frame main body 50, and is bent downward and inserted through the front end of the frame main body 50. The footrest 622 crosses the front side of the wheelchair frame 40. A seat (not shown) is stretched between the seat portions 621 located on the left and right sides of the user.
The seat portion 621 of the seat leg pipe member 62 is fastened to the frame body 50 via a fastening member 52.

The armrest pipe member 63 is a “C” -shaped member having one end connected to the backrest pipe member 61 and the other end connected to the seat leg pipe member 62 by the connecting member 53. is there.
The connecting member 53 has an annular member 53a that is inserted tightly into the seat portion 621 of the backrest pipe member 61 or the seat footrest pipe member 62, and an insertion hole into which the end portion of the armrest pipe member 63 is press-fitted. And a cap portion 53b formed with a protruding portion that is screwed to the tab portion of the annular member 53a at an adjusted angle.

The rear interval pipe member 64 is for maintaining the interval between the rear portions of the pair of frame main bodies 50. The rear spacing pipe member 64 is fastened to the frame body 50 by a fastening member 54.
The center interval pipe member 65 is for maintaining the interval between the center portions of the pair of frame main bodies 50. The center interval pipe member 65 is fastened to the frame body 50 by a fastening member 54.

  As shown in FIG. 3, at the ends of the backrest pipe member 61, the seat leg pipe member 62, the armrest pipe member 63, the rear spacing pipe member 64, and the central spacing pipe member 65, as shown in FIG. A notch 601 is formed along the axis of the pipe member.

The frame body 50 is a long plate-like metal member that extends from the tip end portion that holds the support shaft of the front wheel 30 to the position of the user's waist. The frame body 50 is formed with holes for weight reduction. In the present embodiment, the frame body 50 is formed of a magnesium alloy in order to further reduce the weight.

Here, the fastening structure to each pipe member by the frame main body 50 and the fastening members 51, 52, 54 will be described in detail based on the drawings.
As shown in FIG. 4, the fastening member 51 includes a sleeve member 51 a that presses the backrest pipe member 61 from the outside, and a fixing member 51 b that is connected to the frame body 50.
The sleeve member 51 a is a cylindrical member whose inner diameter is larger than the outer diameter of the backrest pipe member 61. The sleeve member 51a is brought into close contact by being press-fitted into the backrest pipe member 61.

The fixing member 51b includes a relay member 511 and an auxiliary member 512.
The relay member 511 includes a cylindrical portion 511 a that is press-fitted into the backrest pipe member 61, an insertion portion 511 b that is inserted into an insertion hole 501 formed in the upper surface of the rear end portion of the frame body 50, and the backrest pipe member 61. And a flange portion 511c against which the abuts.
Insertion portion 511b of the fixing member 51b is a slit from the rear communicating with the insertion hole 501, is narrowed by screwing from the side of the frame body 50 by screws 51c, it is fixed by being held between the frame body 50 .
The auxiliary member 512 is a cylindrical member that is press-fitted into the cylindrical portion 511a.

The fastening member 52 includes a sleeve member 52 a that presses the seat leg pipe member 62 from the outside, and a fixing member 52 b that is connected to the frame body 50.
The sleeve member 52a can be the same as the sleeve member 51a as long as the outer diameter of the seat leg pipe member 62 is the same as that of the backrest pipe member 61.
The fixing member 52 b includes a relay member 521 and an auxiliary member 522.
The relay member 521 includes a cylindrical portion 521a that is press-fitted into the seat footing pipe member 62, a projection 521b that is screwed to the frame body 50 at an adjusted angle, and a flange portion 521c against which the seat footing pipe member 62 abuts. Formed from.

Next, the fastening member 54 will be described with reference to FIG. The fastening member 54 shown in FIG. 5 fastens the center interval pipe member 65 to the frame main body 50.
The fastening member 54 includes a sleeve member 54 a that presses the central portion spacing pipe member 65 from the outside, and a fixing member 54 b that is connected to the frame body 50.
The sleeve member 54a can be the same as the sleeve member 51a as long as the outer diameter of the central spacing pipe member 65 is the same as that of the backrest pipe member 61.

The fixing member 54 b includes a relay member 541 and an auxiliary member 542.
Relay member 541, insert a cylindrical portion 541a to be press-fitted in the center spacing pipe member 65 is inserted into the insertion hole 502 formed on the inner surface of the frame body 50 is screwed from the outer surface of the frame body 50 A portion 541b and a flange portion 541c against which the central portion spacing pipe member 65 abuts are formed.
The auxiliary member 542 is a cylindrical member that is press-fitted into the cylindrical portion 541a.

In this manner, the fastening member 54 for fastening the center spacing pipe member 65 to the frame body 50 is formed, and although not shown in detail, the rear spacing pipe member 64 is connected to the frame body 50. The fastening member 54 has the same configuration.

  In the present embodiment, the backrest pipe member 61, the seat footrest pipe member 62, the rear interval pipe member 64, the center interval pipe member 65, the sleeve members 51a, 52a, 54a, the cylinder portion 511a, Pin members 72 that pass through 521a and 541a and auxiliary members 512, 522, and 524, respectively, are provided.

The wheelchair frame 40 according to the present embodiment configured as described above includes a frame body 50 and fastening members 51, 52, and 54 .

Next, a fastening method for fastening each pipe member to the frame body will be described.
First, the sleeve members 51a, 52a, 54a are press-fitted outside the pipe member 61 for backrest, the pipe member 62 for seat footrest, the pipe member 64 for the rear part spacing, and the pipe member 65 for the central part spacing. Located at the end of the member.
Since a notch 601 (see FIG. 3) is formed at the end of each pipe member, even if the outer diameter of the pipe member is somewhat the same as the inner diameter of the sleeve members 51a, 52a, 54a, Since the outer diameter of the pipe member is reduced by reducing the width of the cutout portion 601, the sleeve members 51a, 52a, and 54a can be press-fitted. In addition, the tightness between the pipe member and the sleeve members 51a, 52a, and 54a is maintained by the restoring force to expand the notch 601.

Next, the auxiliary members 512, 522, and 524 are press-fitted inside the cylindrical portions 511a, 521a, and 541a of the fixing members 51b, 52b, and 54b.
Next, the backrest pipe member 61, the seat footrest pipe member 62, the rear spacing pipe member 64, and the central spacing pipe member 65 whose ends are not expanded by the sleeve members 51a, 52a, 54a. Then, the cylindrical portions 511a, 521a, 541a of the fixing members 51b, 52b, 54b are press-fitted.

In the case of the backrest pipe member 61, the insertion portion 511b of the fixing member 51b is inserted into the insertion hole 501 of the frame body 50 and screwed. Further, in the case of the seat leg pipe member 62, the protrusion 521b of the fixing member 52b is screwed to the frame body 50. Further, in the case of the rear spacing pipe member 64 and the central spacing pipe member 65, the insertion portion 541b of the fixing member 54b is inserted into the insertion hole 502 of the frame body 50 and screwed.

As described above, according to the wheelchair frame 40 according to the present embodiment, the backrest pipe member 61, the seat footrest pipe member 62, the armrest pipe member 63, the rear space pipe member 64, Since the center interval pipe member 65 is connected to the frame main body 50 via the fixing members 51b, 52b, 54b of the fastening members 51, 52, 54 , two or more pipe members are connected to the frame main body. 50 can be fastened.

Further, according to the wheelchair frame 40 according to the present embodiment, even if the sleeve members 51a, 52a, 54a are press-fitted into the pipe member from the outside, the auxiliary members 512, 522 are provided inside the cylinder portions 511a, 521a, 541a. , 542 are press-fitted and the cylindrical portions 511a, 521a, 541a are given sufficient strength to tighten the sleeve members 51a, 52a, 54a, so that the pipe member does not deform inward.
Accordingly, the sleeve members 51a, 52a, and 54a are tightened from the outside of the pipe member, and the cylindrical portions 511a, 521a, and 541a are tightened from the inside of the pipe member, so that the pipe member can be firmly fastened to the frame body 50.

Each pipe member is fastened by press-fitting through the frame main body 50, the sleeve members 51a, 52a, 54a, and the fixing members 51b, 52b, 54b of the fastening members 51, 52, 54. Is unnecessary. Therefore, even if the pipe member is damaged by an impact or the like and is recessed, it can be easily replaced by releasing the press-fitting of both ends of the damaged pipe member and preparing a new pipe member.

Thus, the wheelchair frame 40 can give the fastening portion sufficient strength without welding.

In the present embodiment, the auxiliary members 512, 522, and 524 are press-fitted inside the tube portions 511a, 521a, and 541a. However, the tube portions 511a, 521a, and 541a are thickened, or the tube portions 511a. , 521a and 541a are not hollow, and are solid, so that the sleeve members 51a, 52a and 54a can be tightened without increasing the thickness of each pipe member.
Further, the frame main body 50 and the fixing members 51b, 52b, 54b may be configured integrally, and screwing at each location may be omitted.

  Since the fastening member 51, 52, 54 is provided with a pin member 72 that also penetrates the pipe member together, it is possible to prevent the shaft member from rotating and to prevent the pipe member from coming off. Can do.

In the present embodiment, one end of the armrest pipe member 63 is connected to the backrest pipe member 61 and the other end is connected to the seat footrest pipe member 62 via the connection member 53. Therefore, when the attachment position to the backrest pipe member 61 or the attachment position to the seat footrest pipe member 62 is changed, the angle formed by the protrusion of the cap portion 53b and the annular member 53a changes.
By replacing the cap portion 53b of the connecting member 53 with a fastening member 52 for fastening the seat footing pipe member 62 to the frame body 50, the backrest pipe member 61 or the seat footing pipe member 62 is It is possible to provide an angle adjusting mechanism of the present invention in which the armrest pipe member 63 can be screwed at an adjusted angle.

Further, by replacing the cap portion 53b of the connecting member 53 with the fastening member 52, the backrest pipe member 61 or the seat leg pipe member 62 fastened to the frame body 50 is added to the armrest pipe member 63. Can be further coupled.

The present invention is particularly suitable for a self-propelled wheelchair in which movement by a user is frequently performed and an object easily hits a pipe member during movement.

DESCRIPTION OF SYMBOLS 10 Wheelchair 20 Large wheel 21 Tire 22 Rim 23 Hand rim 24 Hub axle 30 Front wheel 40 Wheelchair frame 50 Frame main body 501, 502 Insertion hole 51 Fastening member 51a Sleeve member 51b Fixing member 51c Screw 511 Relay member 511a Tube part 511b Insertion part 511c Flange portion 512 Auxiliary member 52 Fastening member 52a Sleeve member 52b Fixing member 521 Relay member 521a Tube portion 521b Protrusion portion 521c Flange portion 522 Auxiliary member 53 Connecting member 53a Annular member 53b Cap portion 54 Fastening member 54a Sleeve member 54b Fixing member 541 Relay member 541a Tube portion 541b Insertion portion 541c Flange portion 542 Auxiliary member 61 Backrest pipe member 62 Seatrest pipe member 621 Seat portion 622 Footrest 63 armrest pipe member 64 rear spacing pipe member 65 central spacing pipe member 601 notches 71 cap 72 pin member

Claims (6)

A frame body and a plurality of pipe members disposed on both sides of the wheelchair are wheelchair frames fastened with fastening members,
The fastening member is formed with a sleeve member that is press-fitted outside the end of the pipe member, and a cylindrical portion that is press-fitted inside the pipe member, and the pipe member is deformed inward by the pressing force of the sleeve member. A wheelchair frame , comprising: a relay member that prevents this from happening; and an auxiliary member that is press-fitted inside the cylinder portion, and a fixing member that is connected to the frame body . 2. The wheelchair according to claim 1, wherein the fixing member of the fastening member includes a flange portion that is formed at an end portion of the cylindrical portion of the relay member and against which an end portion of the pipe member abuts. For frames. The fixing member of the fastening member includes an insertion portion that protrudes from the flange portion of the relay member and is inserted into an insertion hole formed in the frame body, or a projection portion that is screwed to the frame body. The wheelchair frame according to claim 2, wherein the wheelchair frame is provided. The wheelchair frame according to any one of claims 1 to 3, wherein a notch is formed at an end of the pipe member. The wheelchair frame according to any one of claims 1 to 4, further comprising a pin member penetrating the cylindrical portion of the sleeve member, the pipe member, and the relay member . The wheelchair frame according to any one of claims 1 to 5, wherein the relay member is formed with an angle adjusting mechanism for changing an angle of the pipe member.

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