JP2015168415A - Level difference climbing-over caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster that can be attached to a fitting part of a wheelchair, a walking aid, a walker for the aged, a handcart, etc., and can smoothly climb over small to large level differences.SOLUTION: A level difference climbing-over caster is a caster having a frame 1 and a plurality of wheels. The frame 1 is composed of an inner frame 11 and an outer frame 12. A large wheel 21 and a small wheel 23 are attached to the inner frame 11, and a middle-sized wheel 22 is attached between the inner frame 11 and the outer frame 12. A contact surface of each wheel from the large wheel 21 to the small wheel 23 is arranged toward the forward so as to be directed upward in an arch-shaped manner.

Description

Detailed Description of the Invention

  The present invention relates to a step climbing caster that is mounted on a walking aid, a wheelchair, a silver car, a wheelbarrow, a shower chair, and the like and is suitable for climbing over a stepped portion.

Conventionally, walking aids, wheelchairs, silver cars, wheelbarrows, shower chairs, etc., used by elderly people, those with weak legs, disabled people, etc. In addition, a large force is required to overcome the steps. Since the elderly and the like are weak, there is a problem that the user may wobble at the stepped portion and may fall, causing anxiety to the user.
In addition, there is a problem that the step cannot be easily overcome.
Therefore, various casters are provided. For example, the thing of the multi-wheel shown in patent document 1 (Unexamined-Japanese-Patent No. 2006-281884) is provided.

Japanese Patent Laid-Open No. 2006-281884

Problems to be solved by the invention

  Casters mounted on wheelchairs, silver cars, wheelbarrows, etc., when used outdoors, require a large amount of force to pass over a large step, which can be a heavy load for users without physical strength. There are problems such as being unable to pass through, and casters such as walking aids and shower chairs used indoors have problems such as entanglement of dirt between the wheels and the rotation of the wheels stopping, so there are small steps Therefore, further improvement is required to cope with a large step, for example, a step of 5 to 40 mm.

Also, if you use a large wheel with a diameter of 20 cm to 40 cm, you can get over a large step, but there is a problem that it hits your foot because it is large

Means for solving the problem

As a means for solving the above-mentioned conventional problems, the present invention is a caster comprising a frame 1 and a plurality of wheels, the frame 1 being an inner frame 11 and an outer frame 12. And a large wheel 21 and a small wheel 23 are attached to the inner frame 11, a middle wheel 22 is attached between the inner frame 11 and the outer frame 12, and each wheel from the large wheel 21 to the small wheel 23 is attached. A caster for stepping over a step, wherein the contact surface is arranged so as to face upward in a bow shape toward the front.

  The present invention according to claim 2 is arranged such that the contact surface of each wheel from the rearmost wheel large 21 to the foremost wheel small 23 is in contact with a virtual arc line having a diameter of 20 cm to 40 cm. A caster for stepping over a step according to claim 1.

According to the third aspect of the present invention, the mounting shaft 3 is provided on the upper surface of the frame 1, the frame 1 is rotatable with respect to the mounting shaft 3, and the mounting shaft 3 is in the second wheel 22 from the front. The step climber caster according to claim 1 or 2, wherein the caster is located on a rotation axis.

Effect of the invention

  According to the present invention, it is compact, and the ground contact points of the six wheels ahead of the large wheel 21 run up the steps one after another, and a large driving force can be obtained even with a small force. Accordingly, it is an object of the present invention to provide a caster that can be climbed from a small step to a large step and that can easily and safely pass through the step by reducing an impact at the time of overcoming the step. Further, the present invention provides a caster in which dust or the like is not easily entangled between wheels.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a right side view of a caster over a step according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a rear view thereof, FIG. 4 is a plan view thereof, FIG. 5 is a bottom view thereof, and FIG. FIG. 7 is a right side view of the frame 1, FIG. 8 is a front view thereof, FIG. 9 is a rear view thereof, FIG. 10 is a plan view thereof, and FIG.

As shown in the figure, the step climbing caster according to the present invention includes a frame 1, a plurality of wheels, that is, a large wheel 21, a middle wheel 22, a small wheel 23, and a mounting shaft 3.

The frame 1 is composed of an inner frame 11 and an outer frame 12, and each of the inner frame 11 and the outer frame 12 is formed by an upper surface plate 13 and a side surface plate 14 extending downward from both sides thereof. It is a letter shape and has a unique shape as shown in the figure. The side plate 14 is provided with a through-hole 16 that becomes the rotating shaft 15 of each wheel. The rotating shaft 15 of each wheel is attached to the through hole 16.

The inner frame 11 is integrated by fixing the upper surface plate 13 of the inner frame 11 to the back surface of the upper surface plate 13 of the outer frame 12 by welding.
A mounting shaft 3 is provided on the outer frame 12. The attachment shaft 3 passes through holes provided in the inner frame 11 and the outer frame 12 and is fixed by bolts and nuts, so that the attachment shaft 3 and the frame 1 are rotatable.

The inner frame 11 is provided with a rotating shaft 15 between the side plates 14, 14 of the inner frame 11, and a large wheel 21, a middle wheel 22, and a small wheel 23 are attached. Between the inner frame 11 and the outer frame 12, a rotating shaft 15 is provided between the side plate 14 of the inner frame 11 and the side plate 14 of the outer frame 12, and four of the wheels 22 are attached. Each side plate 14 is provided with a through hole 16, and a rotating shaft 15 of each wheel is attached to the through hole 16.

In the inner frame 11, one large wheel 21 and two small wheels 23 are attached between the side plates 14 of the inner frame 11 at the rear, and each wheel rotates.
Between the side plate 14 of the inner frame 11 and the side plate 14 of the outer frame 12, two of the four wheels 22 are attached to the left and right sides of the inner frame 11, and each wheel rotates.
The large wheel 21 is a main wheel, the middle wheel 22 and the small wheel 23 are auxiliary wheels, and only the large wheel 21 (main wheel) is grounded on a flat place.

The frame 1 is arranged in the order of the wheel large 21, the middle wheel 22, the small wheel 23, the small wheel 22, the small wheel 23 from the rear side in the side view, and the contact surface of each wheel, that is, the outer shape of each wheel. The road surface and the surface (contact point) in contact with the step are arranged so that the rearmost wheel large 21 faces upward in a bow shape, and the contact surface of the foremost small wheel 23 is disposed at the highest position. Yes. Desirably, the contact surface of each wheel from the rearmost large wheel 21 to the foremost small wheel 23 may be arranged so as to contact with a virtual arc of a wheel having a diameter of 20 cm to 40 cm.

With this arrangement, the contact surface of the large wheel 21 hits the step of 3 to 4 mm, the contact surface of the rear wheel 22 hits the step of 4 to 12 mm, and the step of 12 to 20 mm. The contact surface of the rear wheel small 23 hits, and the contact surface of the front wheel small 22 hits the step of 20 to 36 mm, and the contact surface of the front wheel small 23 hits the step of 36 to 40 mm.

Accordingly, the six auxiliary wheels run one after another at the contact point with the step (the contact point of the four wheels ahead in the side view), and finally the main wheel gets over the step. Therefore, even with a small force, a large driving force can be obtained.

The attachment shaft 3 is a pin or a bolt so as to be attached by being inserted or screwed into an attachment portion such as a wheelchair, a walking aid, a silver car, a wheelbarrow, or a shower chair, and is formed on the upper surface plate 13 of the frame 1. Yes. And the attachment axis | shaft 3 is located on the rotating shaft of 22 in the 2nd wheel from the front.

The frame 1 is rotatably attached to the attachment shaft 3.

The material of the frame 1 is preferably made of metal in terms of strength, but may be other materials.

The material of the wheel is preferably a synthetic resin, rubber, or elastomer, but may be other materials.

As mentioned above, although demonstrated based on the Example, this invention is not limited to the said Example.
As described above, the present invention provides a step climber caster that can pass smoothly from a small step to a large step.

  The right view concerning embodiment of this invention   The front view concerning embodiment of this invention   The rear view concerning embodiment of this invention   The top view concerning the embodiment of the present invention   The bottom view concerning the embodiment of the present invention   Left side view according to an embodiment of the present invention   Right side view of frame 1   Front view of frame 1   Rear view of frame 1   Plan view of frame 1   Bottom view of frame 1

DESCRIPTION OF SYMBOLS 1 Frame 11 Inner frame 12 Outer frame 13 Upper surface plate 14 Side surface plate 15 Rotating shaft 16 Through-hole 21 Large wheel 22 Medium wheel 23 Small wheel 3 Mounting shaft

Claims (3)

  A caster comprising a frame and a plurality of wheels, wherein the frame is composed of an inner frame and an outer frame, and a large wheel and a small wheel are attached to the inner frame, and the wheel is interposed between the inner frame and the outer frame. Is installed, and the contact surface of each wheel from the large wheel to the small wheel is arranged so that it faces upwards in a bow shape toward the front.   2. A step-over caster according to claim 1, wherein a contact surface of each wheel from the rearmost wheel large to the foremost small wheel is disposed so as to contact a virtual arc line having a diameter of 20 cm to 40 cm.   An attachment shaft is provided on the upper surface of the frame, the frame is rotatable with respect to the attachment shaft, and the attachment shaft is located on the rotation shaft in the second wheel from the front. The caster over the step according to 1 or 2.

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