JP4264718B2 - Anti-vibration wheelchair - Google Patents

Description

  The present invention relates to a wheelchair having a suspension, and more particularly to a wheelchair that prevents vibration caused by unevenness on a road surface during movement of the wheelchair.

  The symptoms of wheelchair occupants are not uniform, especially for those who feel pain even with slight vibrations, whether they are a wheelchair with a caregiver or a self-propelled wheelchair, run on uneven roads Time is hard. For this reason, various types of wheelchairs having suspensions have been conventionally devised.

  For example, in Patent Document 1, paragraphs ([0007]) and ([0008]) on page 2 of Patent Document 1 describe that “a spring mechanism suspended between a large wheel and a frame, A wheelchair having a suspension device having a damping mechanism for damping vibrations between the large wheel and the frame is disclosed. Regarding the effect, the paragraph ([0031]) on page 4 states that “the vibration of each large wheel that occurs during running is moderated by the damping mechanism and the spring mechanism of each suspension device, and quickly attenuated to prevent the occurrence of a resonance phenomenon. Therefore, vibration during travel can be prevented from being transmitted directly to the frame side, and unpleasant vibration can be prevented from being transmitted to the user. Can reduce fatigue. "

  In the method of Patent Document 2, the paragraph ([0004]) of the second page ([0004]) suspension (or cushions, springs, springs) on four frame struts respectively supporting a pair of front wheels (casters) and rear wheels (drive wheels) in a wheelchair. By attaching a spring, it becomes possible to absorb the impact and easily climb the step against the slope of small steps, sidewalks, etc., and unevenness of the road, and stability is maintained by keeping the seat surface horizontal on the inclined surface. It can be obtained, and vibrations with respect to unevenness etc. can be reduced and comfortable driving can be achieved. Is disclosed.

  From the second line of the second page paragraph ([0007]), the structure of Patent Document 3 is “provided to be vertically rotatable with respect to the main body frame, and one wheel is attached to a portion other than the center of rotation. It has a structure including an arm and a suspension mechanism including one end portion of the main body frame and an elastic member engaging the other end portion of the arm other than the center of rotation ”. For the effect, paragraph ([0008]) “The arm is rotated by the vibration impact from the road surface acting on the wheel. One end is engaged with the main body frame and the other end is engaged with the portion other than the center of rotation of the arm. By providing the member, the elastic member is elastically deformed by the rotation of the arm, the vibration shock energy from the road surface is absorbed and accumulated, the shock vibration acting on the main body frame is mitigated, and the ride comfort is improved. ” is doing.

“A wheelchair equipped with a suspension mechanism between a large wheel and a frame, a spring mechanism that is suspended between the large wheel and the frame and a damping mechanism that attenuates vibration between the large wheel and the frame” A wheelchair in which suspensions (or cushions, springs, springs) are attached to four frame struts that respectively support a pair of front and rear front wheels (casters) and rear wheels (drive wheels) in a wheelchair. In addition, each wheelchair is provided with a suspension mechanism in which the other end portion includes an elastic member that engages with a portion other than the center of rotation of the arm. However, even if the suspension device is attached only to the large wheels, the fine impact received by the front wheels cannot be absorbed. In addition, when a suspension is attached to each frame, the timing for absorbing the vibration of each frame is different, and the vibration absorption shift appears as a shake, and it cannot be said that it is sufficient. The emergence of wheelchairs having suspensions that absorb vibrations smoothly is desired.
JP-A-7-455 Japanese Patent Application No. 2000-126240 Japanese Patent Application No. 2000-300615

  The present invention has been made in view of the above-described facts, and it is an object of the present invention to provide a vibration-absorbing wheelchair having a suspension that smoothly absorbs road surface irregularities.

  In order to solve the above problems, as a result of intensive research, a wheelchair having a suspension in which an elastic member is urged to a caster bracket of a front caster and a spring is urged to an axle bearing of a large wheel.

  The means for solving the problems of the present invention is that a backrest is mounted on a rear frame, a seat and an armrest are mounted on the seat frame, and a suspension base is mounted on a vertical frame suspended obliquely forward from the seat frame to the lower frame. The suspension pedestal support is pivotally supported at one end of the suspension pedestal so that it can pivot, and an elastic member is urged to the other end of the suspension pedestal to pivotally support the other end of the suspension pedestal. A wheelchair in which an axle hole is drilled in the center of the pedestal, and a large wheel axle is pivotally supported in the axle hole, and a rotatable front portion in which an elastic member is urged by a caster bracket on a lower frame A vibration-proof wheelchair characterized by having casters.

  The suspension pedestal support is fixed to the vertical frame suspended from the lower frame and the seat frame, and an elastic member is urged to the suspension pedestal supporting the large wheels, and one end of the suspension pedestal is pivoted to the lower part of the pedestal support. And the vibration which a big wheel receives from a road surface can be buffered by the suspension which pivotally attached the other end to the other end of the base support so that rotation was possible. Furthermore, the vibration which a caster receives from a road surface can be relieved by urging | biasing an elastic member to the caster bracket of a front caster.

  Another means for solving the problems of the present invention is the vibration-proof wheelchair according to claim 1, wherein the elastic member biased by the caster bracket is a rubber member. By using a rubber member as the elastic member urged by the caster bracket, vibration received from the road surface can be softly received.

  One end of the suspension with the vibration isolating member biased to the large wheel is pivotally supported by a suspension base fixed to a vertical frame suspended from the seat frame to the lower frame, and the other end is pivotally attached. By doing so, the vibration which a big wheel receives from a road surface can be relieved. Furthermore, the vibration which a caster receives from a road surface can be relieve | moderated by urging | biasing a vibration isolating member to the axle shaft of a front caster. By urging the vibration isolating member to the large wheels and casters that are in contact with the road surface, it has the effect of absorbing the unevenness of the road surface and preventing vibration.

  The present invention will be described in detail below with reference to the drawings, but the present invention is not limited to the following examples within the scope of the gist.

  As shown in FIG. 1, the anti-vibration wheelchair 100 of the present invention has a backrest 12 on a rear frame 11, a seat portion 14 and an armrest 15 mounted on a seat frame 13, and a large wheel 16 on a lower portion of the seat frame 13. In a wheelchair in which a rotatable front caster 17 is attached to the lower frame 18, the front caster 17 is a caster in which an elastic member is urged by a caster bracket, and one end of the suspension of the large wheel 16 is provided. A suspension is pivotally attached to a lower frame 18 of the wheelchair and a vertical frame suspended from the seat frame 13 at the other end of the suspension. It is a vibration-proof wheelchair.

  The suspension 22 used in the vibration-proof wheelchair of the present invention is composed of the components shown in FIG. One end of the suspension pedestal 25 having an axle hole 31 that pivotally mounts the large wheel 16 at the center is inserted into the elastic member receiver 24 as an elastic member, and a spring member 23 is inserted into the elastic member fixing portion 25a of the suspension pedestal 25. It is fixed with a nut 27a. At the other end of the suspension pedestal 25, a fixed part 25b of the suspension pedestal 25 is pivotally attached to a shaft attachment part 28a of a suspension pedestal receiver 28 attached to the vertical frame 30 with bolts 26 and nuts 27b. Yes. A head portion 24a of an elastic member receiver 24 fixed to one end of the suspension base 25 is pivotally supported by an upper portion 28b of the suspension base receiver 28 to absorb vibration.

  A state where the suspension 22 is attached to the vertical frame 30 is as shown in FIG. In FIG. 3, the suspension 22 is attached to the seat frame 13 and the vertical frame 30, but the attachment position of the suspension 22 is not limited to this position. It may be attached only to the vertical frame 30 or only to the rear frame 11. As shown in FIG. 4, the large wheels 16 are attached to the large wheel axle holes 31 formed in the center of the suspension 22 through nuts and fixed with nuts.

  As shown in FIG. 5, the front caster 17 has a guide 19 inserted in a caster bracket 18, and a vibration isolating rubber is attached to one end of the vibration isolating member 20 and inserted into the guide 19. When the end is inserted into the caster shaft 21 and mounted on the caster 17, the shape shown in FIG. As shown in FIG. 7, the caster 17 to which the vibration isolating member 20 is attached is attached to the lower frame 18 and absorbs the impact received by the wheelchair together with the suspension 22 of the large wheel 16. The anti-vibration member 20 attached to the caster 17 may be a spring member having an anti-vibration action, and is not limited to a rubber member.

Anti-vibration wheelchair FIG. FIG. The perspective view which attached the main wheel to the suspension. The exploded side view of a caster bracket. The side view of a caster. The partial side view of a large wheel and a caster.

Explanation of symbols

100: Anti-vibration wheelchair 11: Rear frame 12: Backrest 13: Seat frame 14: Seat 15: Armrest 16: Large wheel 17: Caster 18: Caster bracket 19: Guide 20: Anti-vibration member 21: Caster shaft 22: Suspension 23: Spring member 24: Elastic member receiver 25: Suspension base 26: Bolt 27: Nut 28: Suspension base receiver 29: Lower frame 30: Vertical frame 31: Axle hole

Claims (2)

A suspension base receiver 28 attached to a lower frame 18 of the wheelchair and a vertical frame 30 suspended from the seat frame 13, and an elastic member fixing portion 25a for fixing an elastic member receiver 24 into which an elastic member is inserted at one end; A suspension 22 comprising a fixed portion 25b pivotally attached to the suspension pedestal receiver 28 at the other end and a suspension pedestal 25 having an axle hole 31 pivotally attached to the large wheel 16 at the central portion;
An elastic member is inserted into one end of the suspension pedestal 25, and an elastic member receiver 24 whose upper end is pivotally supported by the upper portion 28b of the suspension pedestal receiver 28 is fixed to the elastic member fixing portion 25a. A large wheel having an end fixing portion 25b pivotally mounted on a suspension pedestal receiver 28 mounted on a vertical frame 30 of the wheelchair, and a large wheel 16 mounted in the axle hole 31 in the central portion of the suspension pedestal 25. A wheelchair equipped with the suspension 22 that absorbs vibrations of
A guide 19 is fitted into the caster bracket 18 of the front caster, and one end of the vibration isolating member 20 is inserted into the guide 19 and the other end of the vibration isolating member 20 is inserted into the caster shaft 21. The anti-vibration wheelchair characterized by attaching the front caster 17 to the wheelchair on which the suspension 22 is mounted . 2. An elastic member inserted into an elastic member receiver 24 pivotally supported on an upper portion 28b of the suspension base 25 is a spring member, and an elastic member biased by a caster bracket is a rubber member. Anti-vibration wheelchair as described in 1.

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