JP6349118B2 - Reclining wheelchair - Google Patents

Description

  The present invention relates to a reclining wheelchair capable of changing a reclining angle of a back frame with respect to a seat frame.

  Conventionally, various wheelchairs in which the backrest (back frame) of the wheelchair can be reclined have been proposed so that the user can maintain a comfortable posture even when sitting for a long time. For example, in a conventional reclining wheelchair as shown in FIG. 4, the rear portion of the seat frame 23 and the lower portion of the back frame 24 are pivotally mounted so that the back frame 24 tilts backward. The mechanism is adopted.

  In such a reclining wheelchair, the position of the seat frame 23 is fixed without changing, and only the back frame 24 tilts. Therefore, if the back frame 24 is tilted by a reclining operation, the user's There was a risk that the buttocks slip forward on the seat frame 23. Further, in such a reclining mechanism, the reclining operation tends to cause a deviation between the user's back and the surface side of the back frame 24, and the user has to realign the posture after the operation. Here, it may be difficult for the user to rearrange his / her posture, and assistance may be required for re-sitting.

  Therefore, for example, in Patent Document 1, the seating portion (seat frame) includes a front seating portion from the middle portion to the front and a rear seating portion from the middle portion to the rear seating portion (back frame). A wheelchair that can be tilted in the front-rear direction with respect to the front seating portion is disclosed. Accordingly, the user's buttocks can be satisfactorily fallen into the tilted rear seat, so that the body can be prevented from sliding forward even if the angle between the upper body and the lower body is increased.

  Further, for example, in Patent Document 2, a tilt fulcrum pivotally attached to a substantially intermediate portion of a seat frame (seat frame) and a rear end portion of the seat frame can be turned to a back frame (back frame). There is disclosed a reclining wheelchair including a reclining fulcrum pivotally attached and having a lower end portion of the backrest frame slidably attached to a slide rail. As a result, when reclining the wheelchair, the back is tilted while receiving the buttocks of the seated rider (user), so that the seated person is not displaced forward during reclining.

JP 2001-149413 A JP 2006-246990 A

  However, in the wheelchair of Patent Document 1, the angle between the rear seat and the back seat is fixed and fixed, so there is a limit to the reclining angle, and if the user tries to recline more than the limit, the user's buttocks There is a problem that a load is applied from the back to the back, causing problems in sitting comfort, and the user's leg, more specifically the knee, tends to be lifted from the wheelchair.

  Moreover, in the reclining wheelchair of the said patent document 2, since the slide rail with which the lower end part of the backrest frame was slidably attached exists, the place which attaches this slide rail must be ensured under the backrest frame. Therefore, when applying to a self-propelled wheelchair equipped with wheels with large diameters, it is necessary to deviate the position of the axle from the slide rail to the rear side in order to secure the front-rear balance during use. Specifically, it is necessary to attach the axle to the rear of the slide rail. If it does so, since a main wheel will be distribute | arranged excessively back with respect to the user who seats, it will become a structure where it is difficult for a user to operate a main wheel by oneself.

  Further, when a configuration in which the seat frame and the back frame are pivotally attached is adopted, the entire assembling operation must be performed in consideration of distortion generated when the pipes constituting the frame are welded. For this reason, an extremely high level of skill is required for the assembling work, and there is a problem that the working time becomes long and the manufacturing cost becomes high.

  Therefore, an object of the present invention is to provide a reclining wheelchair that can prevent a user from sliding forward even if a reclining operation is performed, and that can be easily assembled.

The present invention includes a main frame, and a reclining wheelchair that includes a seat frame and a back frame attached to the main frame, and is capable of changing a reclining angle of the back frame relative to the seat frame. The frame includes a front side seat frame fixed to the main frame and a rear side seat frame having a front end portion pivotally attached to a rear end portion of the front side seat frame via a tilt fulcrum shaft. The side seat frame is rotatable in the vertical direction with respect to the front side seat frame, and the lower portion of the back frame is connected to a reclining fulcrum shaft provided on the main frame, and the back frame further includes the rear frame. is only in contact with the lower side to the rear end portion of the side seat frames, and the support portion which is not fixed to the rear side seat frame is provided, the back frame There moves downward while drawing the support portion is arc by rotating rearwardly around the reclining fulcrum shaft, the frame rear seat with it, the relative position against the said support part on the support part changed while, while being supported by the support unit, the pivot in the direction hanging downward by the weight of its own weight and a user of the rear seat frame about the tilt pivot shaft, buttocks the rear seat frame of a user It is a reclining wheelchair characterized by being received by .

  With the above configuration, the support portion moves downward when the back frame rotates backward, and the rear seat frame supported by the support portion rotates downward about the tilt fulcrum shaft. Therefore, the rear side seat frame tilted downward can suitably receive the user's buttocks. Therefore, it is possible not only to prevent the user from sliding forward by the reclining operation, but also to prevent the user from slipping between the back frame and the back frame, so that it is not necessary to realign the posture greatly.

  Further, since there is no need to provide special parts such as the slide rail disclosed in Patent Document 2, even if the reclining wheelchair of the present invention is configured as a self-propelled wheelchair, the user operates the axle of the main wheel. It can be easily provided at the optimum position as before.

  Further, the rear side of the rear seat frame and the lower side of the back frame are not directly connected, and the rear side of the rear seat frame is lowered by a support portion provided on the back frame. Therefore, the rear side of the rear seat frame and the lower side of the back frame are unconstrained from each other. By adopting such a configuration, it is not necessary to fix the rear side of the rear seat frame by welding or the like, and it is not necessary to consider welding distortion in the assembling work. It leads to shortening and manufacturing cost reduction.

  Further, it is desirable that a portion of the support portion that comes into contact with the rear seat frame has an arc shape that is curved along the rotation direction of the support portion.

  With this configuration, the support portion can smoothly rotate downward while changing the relative position with the rear seat frame while abutting the rear seat frame.

  The reclining wheelchair includes an expansion / contraction member having a longitudinal direction as an expansion / contraction direction, one end pivotally supported on the upper side of the back frame and the other end pivotally supported on the main frame. It is desirable to have a function to expand and contract as the frame tilts.

  With the above configuration, the reclining operation of the back frame with respect to the main frame can be easily realized using the expansion and contraction of the expansion and contraction member.

  The reclining wheelchair of the present invention is suitable for a self-propelled wheelchair because the rear seat frame rotates downward as the back frame tilts and receives the user's buttocks, so that the user does not slide forward. Can be adopted. In addition, since the rear seat frame and the back frame are not directly connected and are not restrained each other, the assembling work is facilitated, and a very favorable effect of shortening the working time or reducing the cost can be obtained.

It is a side view which shows the normal state of the wheelchair concerning an Example. It is a side view which shows the reclining state of the wheelchair concerning an Example. It is an enlarged view which shows the back side seat frame periphery concerning an Example, (a) is a normal state, (b) shows a reclining state. It is a side view which shows the back frame and seat frame of the conventional reclining wheelchair, (a) is a normal state, (b) shows a reclining state.

  Hereinafter, the embodiment which materialized the reclining wheelchair of the present invention is described in detail. In addition, description is simplified or abbreviate | omitted about the part which has the structure similar to the conventional wheelchair. Further, since members such as a wheelchair frame are symmetrically shaped, only one frame portion of the left and right sides of the wheelchair will be described in the detailed description. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIGS. 1 to 3, the reclining wheelchair 1 (hereinafter referred to as a wheelchair 1 as appropriate) includes a main frame 2, and a bearing 6 for supporting the main wheel 5 on the main frame 2. Is provided. Further, a seat frame 3 and a back frame 4 are attached to the main frame 2.

  The seat frame 3 includes a front side seat frame 7 and a rear side seat frame 8, and the front side seat frame 7 is fixed to the main frame 2. A tilt fulcrum shaft 9 is provided at the rear end of the front seat frame 7, and the front end of the rear seat frame 8 is connected via the tilt fulcrum shaft 9. With this configuration, the rear seat frame 8 is rotatable up and down around the tilt fulcrum shaft 9 with respect to the front seat frame 7. Note that a seating portion on which a user is seated is configured by appropriately attaching a seatcloth (not shown) to the seat frame 3.

  Further, a first lower frame 10 made of a longitudinal member oriented in the front-rear direction is provided at the lower portion of the back frame 4 so as to protrude forward, and the front end of the first lower frame 10 is the main frame. It is pivotally supported by a reclining fulcrum shaft 11 provided at a predetermined position of the frame 2.

  Furthermore, a support portion 13 made of a round bar that rotates about the left-right direction of the wheelchair 1 as an axial direction is provided at a substantially intermediate position of the first lower frame 10 via a flat mounting plate 12. ing. The support portion 13 supports the rear end portion of the rear seat frame 8 from below. More specifically, the rear seat frame 8 and the support portion 13 are only in contact with each other and are in an unconstrained state. Therefore, the rear seat frame 8 is only connected to the front seat frame 7 by the tilt fulcrum shaft 9 and thus hangs downward by its own weight with respect to the tilt fulcrum shaft 9. It has a structure that rotates in the direction.

  Then, the rear end portion of the rear seat frame 8 is supported from the lower side by the support portion 13, so that the rear seat frame 8 and the front seat frame are in the normal state A as shown in FIG. 7 is substantially horizontal on a substantially straight line.

  Further, at the lower part of the back frame 4, the base ends of a pair of left and right hanging plates 14, 14 opposed to each other centering on a pipe constituting the back frame 4 are fixed. Specifically, the drooping plate 14 has a substantially crescent shape curved forward, and a stopper portion 15 made of a spacer member is bridged between the front end portions of the pair of left and right drooping plates 14 and 14. A pipe constituting the main frame 2 is inserted between the pair of left and right hanging plates 14 with a gap. The stopper portion 15 is in contact with the main frame 2 in the normal state A shown in FIG. 1, thereby preventing the back frame 4 from tilting forward from a predetermined position.

  An elastic member 19 is disposed on the back frame 4. More specifically, the expandable member 19 includes a rod-like body 16 and a cylindrical body 18, and the upper end of the rod-like body 16 is pivotally supported on the upper end portion of the back frame 4. On the other hand, the lower end of the cylindrical body 18 is pivotally supported on the upper end of the second lower frame 17 provided on the rear side of the main frame 2. And the said rod-shaped body 16 is inserted in the said cylinder 18 by penetration shape, and is mutually assembled | attached. The cylindrical body 18 is provided with locking means (not shown), and the rod-shaped body 16 inserted through the cylindrical body 18 by the locking means can be fixed at an arbitrary position. Yes. In addition, it is desirable that the locking means has a mechanism capable of appropriately switching between a locked state and an unlocked state by a manual operation of a user or an assistant.

  Then, as the back frame 4 is tilted, the rod-like body 16 and the cylindrical body 18 move relative to each other as shown in FIG. On the other hand, the tilting range of the back frame 4 is defined by the rod-like body 16 being locked and fixed to the cylindrical body 18 at a predetermined position.

  Similarly, the rear end portion of the back frame 4 and the rear portion of the main frame 2 with respect to the second lower frame 17 are connected by a damper member 20. By adopting such a configuration, it is possible to suppress an excessive increase in the tilting speed of the back frame 4, to prevent a sharp tilting operation of the back frame 4 from the viewpoint of safety and to prevent the tilted back frame 4 from being tilted. When returning to the original position, the back frame 4 can be urged to the original position according to the reaction force by the damper member 20.

Next, the operation mode of reclining will be described.
When the wheelchair 1 is shifted from the normal state A shown in FIG. 1 to the reclining state B shown in FIG. 2, the locking state of the elastic member 19 is released to allow expansion and contraction, and the back frame 4 is Tilt backwards. After the back frame 4 is tilted to a desired state, the tilt position of the back frame 4 is fixed within the expansion / contraction range defined by the expansion / contraction member 19. The center of rotation of the back frame 4 is the reclining fulcrum shaft 11.

  As described above, with the transition from the normal state A to the reclining state B, as shown in FIG. 3, the support portion 13 provided in the first lower frame 10 moves downward while drawing an arc, Accordingly, the rear seat frame 8 is pushed downward by its own weight or its own weight and the weight of the user, and rotates downward about the tilt fulcrum shaft 9. Since the support portion 13 is not connected and fixed to the rear seat frame 8, the lower portion of the rear seat frame 8 is supported while supporting the rear seat frame 8 while abutting against the rear seat frame 8. Move downward while rotating.

  Thus, when the back frame 4 is set to the reclining state B, the rear side seat frame 8 is inclined downward toward the rear, so that the user's buttocks are suitably received by the rear side seat frame 8. . Further, since the rear seat frame 8 is interlocked corresponding to the tilting of the back frame 4, the rotation angle of the rear seat frame 8 corresponding to the reclining angle of the back frame 4 is obtained, and the reclining state B is obtained. The user's body is less likely to be displaced at the time, and the user does not have to realign his / her posture.

  In addition, the reclining fulcrum shaft 11 provided on the main frame is sufficient if it functions as a rotation shaft for the back frame 4 to rotate, so that it can be downsized and occupies a large space. There is no longer to do. For this reason, the installation space of the bearing 6 for pivotally supporting the main wheel 5 can be secured sufficiently.

  Further, since the rear seat frame 8 and the back frame 4 are not directly connected and are not restricted to each other, it is not necessary to consider welding distortion when assembling the wheelchair 1. For this reason, the assembling work becomes simple and the working efficiency is dramatically improved.

  In addition to the above embodiments, the configuration can be changed as appropriate. For example, auxiliary wheels may be provided at appropriate positions of the main frame 2 in order to improve the overall balance of the reclining wheelchair 1.

DESCRIPTION OF SYMBOLS 1 Reclining wheelchair 2 Main frame 3 Seat frame 4 Back frame 5 Main wheel 7 Front seat frame 8 Rear seat frame 9 Tilt fulcrum shaft 11 Reclining fulcrum shaft 13 Support part 19 Telescopic member A Normal state B Reclining state

Claims (2)

A reclining wheelchair comprising a main frame, and a seat frame and a back frame attached to the main frame, wherein the reclining angle of the back frame relative to the seat frame can be changed,
The seat frame includes a front side seat frame fixed to the main frame, and a rear side seat frame having a front end portion pivotally attached to a rear end portion of the front side seat frame via a tilt fulcrum shaft, The rear seat frame is rotatable in the vertical direction with respect to the front seat frame,
The lower portion of the back frame is connected to a reclining fulcrum shaft provided on the main frame, and the back frame is only in contact with the rear end portion of the rear seat frame from below, and A support portion that is not fixed to the rear seat frame is provided,
The support portion is moved downward while drawing a arc by the back frame is pivoted rearwardly about the said reclining fulcrum shaft, the frame rear seat with it, against the said support part on the support part while changing the relative position, the while being supported by the support unit, the pivot in the direction hanging downward by the weight of its own weight and a user of the rear seat frame about the tilt pivot shaft, after the user's buttocks is the A reclining wheelchair characterized by being received by a side seat frame .   The reclining wheelchair according to claim 1, wherein a portion of the support portion that comes into contact with the rear seat frame has an arc shape that curves along a rotation direction of the support portion.

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