JP4164739B2 - Six wheelchair wheelchair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a six-wheeled wheelchair in which a front caster can be lifted in order to ride on a step or rotate slightly.
[0002]
[Prior art]
The wheelchair is fitted with a front caster in front of the large wheels to provide stability and direction. Because the front casters were small in diameter, they could not get over the steps, and had to borrow a hand to get over the steps on the indoor sill or on the sidewalk. In order to solve this problem, a wheelchair has been devised in which a caster is further provided at the rear of the wheelchair to tilt the wheelchair rearward and lift the front caster.
[0003]
In Patent Document 1, “a pair of front wheels integrally attached to the lower part of the front part and a pair of main wheels that are suspended vertically in the chair frame and positioned in front of the rear end of the chair frame. A wheel support frame; a pair of main wheels supported by the main wheel support frame; a support member supported by each of the main wheel support frames; and a rear wheel means rotatably disposed on the support member. A telescopic rod having elastic means is disposed between the rear portion of the chair frame and the rear wheel means, and the elastic means biases the telescopic rod in the extending direction so that the user can A vehicle characterized in that when the body weight is moved rearward, the telescopic rod contracts and the chair frame rotates with respect to the rear wheel means so that the front wheel is lifted. It is a child. ". In the wheelchair according to claim 1 of the invention of Patent Document 1, the main wheel is supported by the main wheel support frame suspended from the chair frame, and the rear wheel is disposed through the support member. Yes. Therefore, when the user sits on the wheelchair, the weight of the user is received mainly by the main wheel and the rear wheel located behind the chair frame, and the user can travel stably. And when getting over the step, the user moves the center of gravity backward. The chair frame is tilted backward about the shaft hole and the front wheel is lifted by the user moving the weight backward.
[0004]
In Patent Document 2, "a wheelchair including a main wheel (driving wheel) and a chair frame that is held by a bearing pipe of the main wheel and has a front caster attached to a lower part of a front end thereof, the chair frame is the bearing pipe. And a rear caster frame formed rearwardly extending from the bearing pipe and provided with a rear caster at a rear end thereof, and vertically between the rear caster frame and the chair frame. A telescopic support rod in the direction is pivotally supported at the upper and lower ends, and the telescopic support rod is provided with a remote-controllable locking mechanism. In Patent Document 2, “paragraph number 0028” and “(i) First, the chair frame 17 is moved back and forth so that the center of gravity of the normal seating position of the user (seat) is at the position of the bearing pipe 13. At the same time, the stroke and spring pressure of the telescopic support rod 63 are adjusted to the optimum values for the user by the stroke adjusting screw 79 and the spring pressure adjusting hole 77. In this state, the rear caster 47 is Normally, it is desirable to be in a state where it floats 2 to 3 cm. Also, during normal running, the telescopic support rod 63 is in a locked state (non-stretchable state). ” In a state in which the grip lever 75 is gripped and the telescopic support rod 63 is unlocked, the user moves back the center of gravity to warp the front caster.
[0005]
As shown in 5-2 of FIG. 5, the center of gravity of Patent Documents 1 and 2 is on the axle of the rotating shaft for tilting backward. Therefore, the amount of movement of the center of gravity for tilting the wheelchair backward increases, resulting in a feeling of fear for the wheelchair occupant. Also, moving weight behind the wheelchair is difficult for a wheelchair passenger who has a physical disability and is not easy to do. Further, when the user moves the center of gravity while the rear caster is lifted off the floor as in Patent Document 2, the distance until the rear caster touches the floor falls backward. It gives fear and is not favorable for the user.
[0006]
[Patent Document 1]
Japanese Patent No. 3072462 [Patent Document 2]
Japanese Patent Laid-Open No. 08-38552
[Problems to be solved by the invention]
In order for a wheelchair to climb a step, various methods have been proposed in which the weight is shifted to the rear and the front wheel is lifted, but as described above, it has not been easy for a wheelchair user to use. The present invention has been devised to remedy the above-described drawbacks, and it is an object of the present invention to provide a wheelchair that can easily lift a front caster simply by a user of the wheelchair leaning backward.
[0008]
[Means for solving the problems]
As a result of earnest research to solve the above problems, the wheelchair is divided into a main body part and a movable part, and the main body part is placed on the axis of the movable part. We succeeded in providing a wheelchair that can move over the steps by tilting the main body part to the rear by movement and floating the front caster.
[0009]
A first feature of the present invention is a main body comprising a back frame having a backrest, a side frame having a seat, a front frame having a footrest at the lower part, and a lower frame having a front caster at the front part, A large wheel support frame having a rotating shaft, a moving shaft, and an axle is pivotally attached to a large wheel so that the large wheel support frame can rotate substantially vertically, and a rear upper frame and a rear lower frame are fixed to the large wheel support frame toward the rear. A movable portion having rear casters attached to the joints at both ends thereof, the main body portion being pivotally attached to the rotating shaft of the movable portion, and one end of the elastic member being pivotally attached to the lower end portion of the back frame. And the other end of the telescopic member is pivotally attached to the rear lower frame. With the main body part and the movable part separated, it becomes easier to place the main body part on the axis of the movable part, and by a slight movement of the passenger, the wheelchair can be inclined rearward and the front caster can be easily lifted, Making wheelchairs easier.
[0010]
According to a second aspect of the present invention, there is provided a six-wheeled wheelchair according to claim 1, wherein a substantially central portion of the main body portion is rotatable on a rotating shaft of a large wheel. By placing the center of the main body part on the axis of the movable part, the wheelchair can be tilted rearward and the front caster can be lifted by a slight movement of the occupant.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0012]
As shown in FIG. 1, the six-wheeled wheelchair 100 of the present invention includes a back frame 12 having a backrest portion 11, a side frame 14 having a seat portion 13, a front frame 16 having a footrest 15 at a lower portion, and a front portion at a front portion. A large wheel support frame 23 having a rotating shaft 20, a moving shaft 22 and an axle 21 is pivotally attached to a main body portion 200 including a lower frame 18 having a part caster 17 and a large wheel 19 so as to be rotatable substantially vertically. A rear upper frame 24 and a rear lower frame 25 are fixed to the wheel support frame 23 in the rearward direction, and a movable portion 300 having rear casters 26 attached to joint portions at both ends thereof is provided. Is attached to the rotary shaft 20 of the movable part 300, and one end of the elastic member 27 is attached to the lower end of the back frame 12. There are pivotally attached to the rear lower frame 25.
[0013]
As shown in FIG. 2, the six-wheeled wheelchair 100 of the present invention includes a main body portion 200 and a movable portion 300. The main body portion 200 includes a back frame 12 having a backrest portion 11, a side frame 14 having a seat portion 13, a front frame 16 having a footrest 15 at a lower portion, and a lower frame 18 having a front caster 17 at a front portion. The movable part 300 is pivotally mounted on the axle 21 of a large wheel support frame 23 having a rotating shaft 20, a moving shaft 22, and an axle 21 so that the large wheel 19 can be pivoted. The rear upper frame 24 and the rear lower frame 25 are fixed to the wheel support frame 23 toward the rear, and the rear casters 26 are attached to the joint portions at both ends thereof.
[0014]
As shown in FIG. 3, the main body portion 200 is pivotally attached to a rotary shaft 20 provided on the upper portion of the axle 21. One end of the elastic member 27 is pivotally attached to the lower end portion of the back frame 12, and the other end of the elastic member 27 is pivotally attached to the rear frame 25. When raising the front caster 17, if the center of gravity is applied to the rear of the seat 13, the sliding portion 29 at the end of the lower frame 18 moves around the rotation shaft 2 as the telescopic member 27 contracts. By sliding in the rail plate 28 provided on the shaft 22, as shown in FIG. 4, the wheelchair 100 can be tilted backward and the front caster 17 can be easily lifted. In the six-wheeled wheelchair 100 of the present invention, since the rear caster 26 is always on the floor, there is no fear of tipping over backwards even when tilted to the rear, and the front caster 17 can be lifted safely.
[0015]
As shown in FIG. 5 (5-2), the rearward tilt for lifting the front caster of a conventional type six wheelchair wheelchair is separated from the seat surface because the rotary shaft 20 is on the axle 21. As a result, the amount of movement of the center of gravity increases, which gives fear to the wheelchair user. As shown in FIG. 5 (5-1), the six-wheeled wheelchair 100 of the present invention has a substantially central portion of the main body portion rotatable on the rotation shaft 20 of the large wheel 19. That is, since the center of gravity portion is immediately below the seating surface, the amount of movement of the center of gravity is small, and there is an effect of not giving fear to the user. Since the rotation axis is close to the seat portion, the effect of the tilt mechanism can be obtained by moving the center of gravity. Therefore, the user can disperse the body pressure by performing an operation during long-time use.
[0016]
【The invention's effect】
By placing the center of gravity of the six-wheeled wheelchair on the rotating shaft of the large wheel, when the front caster is lifted by tilting backward, the wheelchair has little movement and does not give the user a sense of fear. Furthermore, by placing the center of gravity on the rotation axis, the wheelchair can be tilted backward with a slight force. Since the rotation axis is close to the seat portion, the effect of the tilt mechanism can be obtained by moving the center of gravity. Therefore, the user has an effect of being able to disperse body pressure by performing an operation when used for a long time.
[Brief description of the drawings]
FIG. 1 is a perspective view of a wheelchair. FIG. 2 is a divided side view of the wheelchair. FIG. 3 is a side view of the wheelchair. FIG. 4 is a side view of the wheelchair tilted rearward. Explanation of]
100: Six-wheeled wheelchair 200: Main body part 300: Movable part 11: Backrest 12: Back frame 13: Seat part 14: Side frame 15: Footrest 16: Front frame 17: Front caster 18: Lower frame 19: Large wheel 20: Rotating shaft 21: axle 22: moving shaft 23: large wheel support frame 24: rear upper frame 25: rear lower frame 26: rear caster 27: telescopic member 28: rail plate

Claims (2)

A body portion comprising a back frame 12 having a backrest portion 11 , a side frame 14 having a seat portion 13 , a front frame 16 having a footrest 15 at a lower portion, and a lower frame 18 having a front caster 17 at a front portion ; A large wheel 19 is pivotally attached to an axle 21 of a large wheel support frame 23 having a moving shaft 22 and an axle 21 provided with a rotating shaft 20 and a rail plate 28, and is attached substantially vertically to the large wheel 19. A wheelchair composed of a movable part in which a rear upper frame 24 and a rear lower frame 25 are fixed to the large wheel support frame 23 facing rearward, and rear casters 26 are attached to joint portions at both ends thereof. The center portion of the main body portion is pivotally mounted on the rotating shaft 20 of the movable portion, and the rear end portion of the lower frame 18 of the main body portion is moved to the movable portion. Axially mounted to a rail plate 28 of the shaft 22, characterized in that the pivotally attached to one end of the back frame 12 of the lower end portion to the elastic member 27 and pivotally attached to the other end of the elastic member 27 to the lower rear frame 25 A six-wheeled wheelchair. The center portion of the main body portion can be rotated on the rotation shaft of the large wheel, and the seat occupant shifts the center of gravity rearward, whereby the main body portion is lowered rearward from the rotation shaft 20 of the movable portion, and the rear end of the lower frame 18 The six-wheeled wheelchair according to claim 1, wherein the portion slides on the rail plate (28) of the moving shaft (22) and the front caster (17) is lifted.

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