JPH0574519U - wheelchair - Google Patents

Abstract

(57) [Summary] [Purpose] It is safe even for a manual wheelchair, and it is possible to easily climb over a step, and to prevent the wheelchair from rolling backwards during balance driving training. [Structure] A support arm 11 having a sliding portion 14 is attached to the rear ends of a pair of lower pipes 10 of a wheelchair body 1 having a small-diameter front wheel 5 and a large-diameter rear wheel 4, and the sliding portion 14 serves as a road surface 1.
The support arm 11 is set so that the vertical line 35 passing through the center of gravity of the wheelchair 1 passes through an appropriate position behind the rear axle 25 when in contact with the wheelchair 3. It moves forward with the rearward leaning posture, and climbs over the step 20 while keeping the front wheels 5 floating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manual wheelchair, and in particular, it makes it possible to safely and easily get over a stepped portion by using a support arm, and further, the support arm serves as a stopper when falling backward. By having it, it is possible to safely and easily carry out the balance exercise for levitating the front wheels to get over a step.

[0002]

[Prior Art]

 A conventional manual wheelchair has a small diameter caster wheel for maneuvering on the front wheels, and a large diameter wheel for driving on the rear wheels, and has good operability on a flat surface.

However, since the radius of the front wheel is extremely small, it is almost impossible to get over the step.

As a countermeasure for this, for example, as disclosed in Japanese Utility Model Laid-Open No. Sho 55-67722, there is known a wheelchair having a structure for mounting a ride-over tool for a step portion that swings near a small diameter front wheel. ing.

In the above-described conventional wheelchair having a step-over tool, the lower surface of the step-over tool is curved, and the wheelchair advances to bring the lower surface of the step-over tool into contact with the corner of the step section. As the vehicle moves forward, the front wheels float, and the wheelchair is supported by the ride-over gear and the rear wheels. When the vehicle further moves forward, the front wheels will move to the stepped portion, and it will be possible to get over the stepped portion.

[0006] Also, a method is known in which, by training, the front portion of a general wheelchair is lifted up to climb over a step while maintaining the balance of the center of gravity, but there is a risk of falling backward during practice. Therefore, it is difficult to practice.

[0007]

[Problems to be solved by the device]

 In the above-mentioned wheelchair for climbing over a step, the structure becomes complicated and the weight also increases. Also, when this configuration is applied to a manual wheelchair, the distance between the center of the rear axle of the wheelchair and the vertical line passing through the center of gravity of the chair is close, so when the front part of the wheelchair is raised too much when climbing over a step. However, there is a risk that the wheelchair may fall backward, and it is not possible to maintain the front wheel lifting posture at a safe angle. Further, there is a risk of falling backward during the balance training.

[0008]

[Means for Solving the Problems]

 The present invention has been proposed to solve the above-mentioned drawbacks and problems, and the boss of the support arm is inserted and fixed to the lower pipe of the wheelchair, and the other end of the support arm is extended to the outside of the rear wheel to make the wheelchair accessible. By providing a wheelchair capable of safely climbing over a step while lifting the front wheels by acting as a support tool for maintaining the posture when leaning backwards. Furthermore, by making the support arm function as a stopper to prevent backward fall, balance training can be performed safely and easily.

[0009]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments of the drawings. The wheelchair body 1 of FIG. 1 has a conventionally known structure, in which a hand-pushing lever 3 is extended to a rear end of a seat portion 2, a pair of left and right large rear wheels 4 and a traveling direction are freely set. A pair of left and right front wheels 5 of small diameter as convertible casters are mounted, and footrests 7 for mounting feet are provided in front of the left and right front legs 6 with the front wheels 5 mounted on the lower end thereof. An operating ring 8 for driving rear wheels is concentrically provided on the outer side. Further, the footrest mounting pipe 9, the front leg 6, and the lower ends of the hand pushing lever 3 are connected to each other by a lower pipe 10 on the left and right sides. A support arm 11 is attached to the rear end of the lower pipe via a boss 12.

If a straight line 29 that connects the center of gravity 28 of the wheelchair including the occupant and the axis 25 of the rear wheel 4 forms a stable angle 32 with a vertical line 31 that passes through the axis 25, the wheelchair 1 is an axis. When it is rotated rearward about the center 25, the balance state is in the state where the stability angle 32 is 0 degree, and further backward movement starts the backward rotation.

If the angle formed by the tangent line 33 between the sliding portion 14 at the tip of the support arm 11 protruding rearward from the rear wheel 4 and the outer periphery of the rear wheel 4 to the road surface 13 is the inclination angle 34, the inclination angle is 34. If the angle 34 is selected to be slightly larger than the above-described stability angle 32, the wheelchair 1 will be stable while keeping the backward tilted posture by the sliding portion 14 contacting the road surface 13.

In the embodiment of FIG. 2, a support arm 11 having a plate thickness of about 6 mm has one end fixed to a boss 12 of a hollow shaft, and the other end has a sliding portion 14 on the ground side with a road surface 13. ing. The boss 12 has an outer diameter portion 17 on the assembling side slightly smaller than the inner diameter dimension of the lower pipe 10, and has contact surfaces with the fixed nut 18 cut by about 45 degrees.

The attachment to the lower pipe 10 is fixed by combining the boss 12 and the fixing nut 18, inserting each into the pair of left and right lower pipes 10, and tightening the tightening bolt 19.

In the configuration described above, FIG. 3 shows a situation when climbing over a step, and immediately before a step 20, the occupant 21 moves the wheelchair 1 while moving the center of gravity of the body to the rear. When the operation ring 8 is rapidly rotated in the traveling direction, the momentum generated by the propulsive force 24 of the rear wheel 4 and the inertial force 23 acting on the center of gravity 28 of the wheelchair 1 causes the wheelchair 1 to move in the direction in which the front wheel 5 is lifted as shown in the figure. Turn to.

At this time, the sliding portion 14 of the support arm 11 which is set at an appropriate position is arranged so that the vertical line 35 lowered from the center of gravity 28 to the road surface 13 passes behind the axis 25 of the rear wheel 4. Since the wheelchair 1 comes into contact with the road surface 13, the wheelchair 1 rotates backward by an inclination angle 34 and stops. Further, the sliding portion 14 keeps in contact with the road surface 13, whereby the wheelchair 1 is held in a posture in which the front wheels 5 are levitated.

When the rear wheel 4 is rotated in the traveling direction by the operation ring 8 in this posture, the small-diameter front wheel 5 advances on the upper portion of the step upper surface 36 without hitting the step 20, and the large-diameter rear wheel 5 Even if 4 touches the step 20, it is possible to easily get over the step 20 by simply rotating the rear wheel 4 while moving the center of gravity of the body forward.

Further, as shown in FIG. 4, if the balance training is performed to control the vertical line 35 descending from the center of gravity 28 to the road surface 13 so as to always pass through the axis 25, the front wheels 5 may be moved as necessary. Although it is possible to perform balanced traveling with only the rear wheels 4 while lifting, it is difficult to train and requires a high degree of skill.

During the balance training, particularly when the balance moves rearward, the wheelchair 1 tries to roll backward, but the support arm 11 comes into contact with the road surface 13 and acts as a stopper, so that rollback is prevented. Therefore, the front wheel 5 and the support arm 11 share the roles of the front and rear stoppers of the wheelchair 1 to ensure safety during training.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above-mentioned embodiments, and may be carried out in any manner as long as the configuration described in the scope of claims for utility model is not changed. be able to. For example, as shown in FIG. 5, by attaching a rotating body 16 slightly protruding from the outer shape of the sliding portion 14 on the ground side of the support arm 11 to the support arm 11 via a rotating shaft 15, Sliding contact can also be rotational contact. Further, as shown in FIG. 6, a toothed washer 26 is attached to the boss side of the support arm 11, and this toothed washer 27 is engaged with a toothed washer 27 of a flange 30 provided on the boss side and fixed with a tightening bolt. The position of the sliding portion 14 with respect to the road surface 13 can also be adjusted to the optimum position. Further, even if the inclination angle 34 is smaller than the stability angle 32 by this adjustment, the support arm 11 functions as a stopper for the rearward fall, so that the passenger can perform a momentary front wheel raising operation with a sense of security. It is possible.

[Effect of the device]

 In summary, according to the present invention, in a manual wheelchair, it is safe and extremely easy to get over a stepped portion, and a backward fall prevention safety device at the time of balance training is highly practical.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a side view when a posture of climbing over a step is taken.

FIG. 4 is a side view showing a balanced traveling posture.

FIG. 5 is a side view showing another embodiment of the main part of FIG.

FIG. 6 is a side view showing another embodiment of the main part of FIG.

[Explanation of symbols]

 1 Wheelchair body 4 Rear wheel 5 Front wheel 6 Front leg 9 Footrest mounting pipe 11 Support arm 12 Boss 13 Road surface 25 Shaft center 26 Toothed washer 28 Center of gravity

Claims (1)

[Scope of utility model registration request] 1. In a manual wheelchair, a support arm is attached to a rear frame of the wheelchair, a tip portion of the support arm is projected from an outer diameter of a rear wheel, and a ground portion of the support arm and a ground outer periphery of the rear wheel. A wheelchair with a support arm, characterized in that the angle formed by the tangent to the road section and the road surface is set near the backward stable angle of the wheelchair when the front wheels are in contact with the ground.