JPS5831544Y2 - Wheelchair backrest tilt mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a backrest inclination mechanism for a wheelchair. In particular, the inclination angle of the backrest can be adjusted steplessly, and the operation of the operating lever for such adjustment moves the backrest in the direction of gravity. By requiring it only when folding down, the operation becomes extremely easy and safety is improved.

In addition, the present invention makes it easier to operate the wheelchair at all times and improves safety by moving the operating wheels and rear wheels in accordance with the movement of the user's center of gravity caused by adjusting the inclination angle. It is.

The present invention will be described in detail below based on examples.

Reference numeral 1 designates a wheelchair, and the backrest 2 of the wheelchair 1 is rotatable, and the rear wheel 4 coaxial with the operating wheel 3 is movable in the front-rear direction of the wheelchair 1.

The wheelchair 1 is provided with a guide rod 5 in front of the backrest 2, and a guide frame 6 is movably provided on the guide rod 5.

Thus, the guide frame 6 and the backrest 2 are connected to the support link 7.
At the same time, one side of a support frame 8 that supports the operating wheel 3 and the rear wheel 4 is fixed to the guide frame 6.

In this way, the backrest 2 and the support frame 8 are interlocked by movement of the guide frame 6.

The guide frame 6 supports a locking piece 9 that is loosely fitted to the guide rod 5 so as to be tiltable, and also includes a spring 10 that urges the locking piece 9 into an inclined state, and a spring 10 that resists the urging of the spring 10. A tension wire 11 is provided to rotate the locking piece 9 to ease its inclination, and an operating lever 12 of the tension wire 11 is provided at an appropriate position on the wheelchair 1.

Although the above configuration is applied to both the left and right sides of the wheelchair 1, the operating lever 12 may be common to the left and right sides.

In this configuration, the load applied to the backrest 2 is transmitted to the guide frame 6 via the support link 7, and acts in a direction to move the guide frame 6 to the left in the figure.

At this time, if the operating lever 12 is not operated,
The locking piece 9 is maintained in an inclined state by the bias of the spring 10, and its edge is in contact with the guide rod 5, and the direction in which the guide frame 6 moves due to the load of the backrest 2 is determined by the locking state. Since the inclination of the stopper piece 9 is maintained and the edge contacts the guide rod 5 more strongly, that is, in the so-called biting direction, the guide frame 6 is immovably supported by the so-called tilt lock principle, The backrest 2
It supports against the load and cannot be lowered.

When rotating the backrest 2 in a direction that resists a load, that is, when raising the backrest 2, the guide frame 6 is moved to the right in the figure, but the inclination of the locking piece 9 is relaxed in this direction. Therefore, the guide frame 6 can be moved without any hindrance, and the backrest 2 can be rotated in the direction that resists the load without operating the operating lever 9 at all. It can be raised, that is, it can be raised.

Next, by operating the operating lever 12, the tension wire 1 is
1, the locking piece 9 rotates against the bias of the spring 10 and the inclination is relaxed, and the etch no longer comes into contact with the guide rod 5, so the inclination locking action is no longer activated.
Therefore, the backrest 2 can be rotated in the direction of the load and lowered.

At this time, the locking piece 9 is biased in the direction of inclination by the spring 10, so when you release your hand from the operating lever 12, the locking piece 9 instantly tilts again, making it impossible to move the guide frame 6 as described above. Therefore, even if you accidentally release your hand from the operating lever 12 during operation, it is possible to completely prevent the backrest 2 from falling in the direction of the load.

When the inclination angle of the backrest 2 is adjusted as described above, the user's center of gravity also moves in the front-rear direction of the wheelchair 1.

That is, the user's center of gravity when the backrest 2 is in a gentle incline, a so-called reclining state, moves further back than when the backrest 2 is in a steep incline.

In conventional wheelchairs with a tilting backrest in which the rear wheels 4 do not move in the front-rear direction, the rear wheels are fixed in advance further back than in regular wheelchairs with a fixed backrest to prevent instability when the center of gravity moves backwards. Therefore, there is a drawback that the backrest is tilted steeply, making it difficult to operate the operating wheels from a sitting position.

However, in the present invention, when the backrest 2 is rotated and raised, the guide frame 6 moves to the right in the figure, so the support frame 8 whose one side is fixed to the guide frame 6 also moves to the right in the figure. The operating wheel 3 and rear wheel 4 are moved to the front of the wheelchair 1.

Further, when the backrest 2 is rotated and lowered, the operating wheels 3 and rear wheels 4 move to the rear of the wheelchair.

In this way, in the present invention, when the user's center of gravity moves by adjusting the inclination angle of the backrest 2, the operating wheel 3 and the rear wheel 4 automatically move in the direction in which the center of gravity moves. 3 can be operated in the same state regardless of the movement of the center of gravity, which not only makes this operation easier, but also prevents stability from being impaired by movement of the center of gravity.

As described above, the present invention makes it possible to maintain the backrest at an appropriate inclination angle by rationally utilizing the principle of inclination lock, so that the inclination angle of the backrest can be adjusted steplessly. There is.

Moreover, when adjusting the inclination angle, the operation is very easy as the control lever only needs to be operated when lowering the backrest.Moreover, if the control lever is not operated, it will automatically become unable to lower, so it is safe. It is also characterized by high sex.

Furthermore, in the present invention, when the user's center of gravity moves by adjusting the inclination angle of the backrest as described above, the operating wheel and rear wheel automatically move in the direction in which the center of gravity moves. It is characterized in that it can be operated easily and the stability of the wheelchair is not impaired at all due to the movement of the center of gravity.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a perspective view to explain the main parts of the wheelchair, Figure 2 a, l) is a side view to explain the operation, and Figure 3 a, l) is a perspective view to explain the main parts of the wheelchair. FIG. 4 is an enlarged cross-sectional view of the main part in FIGS. 2a and 1), and FIG.

Claims (1)

[Scope of utility model registration request] The backrest of the wheelchair is configured to be rotatable, and a rear wheel concentric with the operating wheel is configured to be movable in the front-rear direction of the wheelchair, and a guide rod is provided in front of the backrest, and a guide frame is attached to the guide rod. is movably provided, and the guide frame and the backrest are connected by a support link, and one side of a support frame that supports the operating wheel and the rear wheel is fixed to the guide frame, and the guide frame is provided with the guide frame. A spring that supports the locking piece loosely fitted to the rod so as to be tiltable and biases the locking piece in an inclined state; and a spring that rotates the locking piece against the bias of the spring to tilt the locking piece. 1. A backrest tilting mechanism for a wheelchair, characterized in that a tension wire is provided to relieve the tension, and an operating lever for the tension wire is provided at an appropriate position on the wheelchair.