JPH05178001A - Caster - Google Patents

Abstract

PURPOSE:To greatly improve step-difference running over capacity by providing a travelling wheel to travel on a flat ground and a large diametral semicircular and bow-shaped auxiliary wheel to climb up and down a step-difference and by climbing up and down on the step-difference with the auxiliary wheel. CONSTITUTION:An auxiliary shaft 33 of a semicircular and bow-shaped auxiliary wheel 34 is supported by a revolving main frame 20 with a leg part to support an axle 31 of a travelling wheel 30 axially installed on an installation base body 10 and a revolution constraint frame 40 capable of oscillating between the main frame 20 and the installation base body 10, and a brake 42 with a projection and a brake receiver 44 are respectively provided between the main frame 20 and the installation base body 10. The auxiliary wheel 34 is in the state floating above the ground and is constituted to be energized to rotate forward by an extension spring extensively provided between the leg part and the auxiliary wheel 34, and the flat ground is travelled on by the travelling wheel 30, and in the case when a corner of a step-difference makes contact with the auxiliary wheel 34, the brake 42 works and constrains revolution, and the step-difference is climbed up and down by the auxiliary wheel 34.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a stroller, a wheelchair,
The present invention relates to a caster which can be easily mounted on a dolly or the like so as to easily climb over a step.

[0002]

2. Description of the Related Art Conventionally, a caster attached to the lower portion of a trolley or the like has a traveling wheel having a small diameter and a height of its carrier to make it easy to load and unload loads, and to ensure traveling stability. Strollers for strollers and wheelchairs can be folded compactly for easy transportation, and when the traveling wheel turns horizontally, the traveling wheel with a smaller diameter is used so that the traveling wheel does not come into contact with other components and hinder the movement. It is equipped.

[0003]

A problem to be solved is that if the diameter of the traveling wheel is small, only a small step can be overcome. Generally, the height of the step that can be overcome by the wheel is less than the height of the intersection of the center of gravity of the running body, the vector from the axis of the running wheel and the outer diameter of the running wheel, which takes into account the speed and pushing torque. is there. The first half of the period is usually downward in the direction of travel. The vector approaches parallel as the speed increases, and the position with the intersection of the outer diameters of the traveling wheels also rises, but it also means that the impact when overcoming the step becomes large. Therefore, the larger the diameter of the wheel relative to the step, the easier it is to get over and the smaller the impact. There is no problem when moving only on a flat place, but when moving outdoors there are countless steps such as steps between the roadway and pedestrian crossing, seams of sidewalks, etc. There are many cases where it is not possible, and sometimes there are situations in which life and death are involved.

As a means for solving these problems, Japanese Unexamined Patent Publication No. 64-44301 proposes a caster provided with a sled member in the traveling direction and a brake for restraining turning when the sled member acts. However, in the above-mentioned conventional caster, the surplus material and the sled rub against each other when riding over a step, and extra force is required. Further, when going down a step, the sled does not act and the diameter of the traveling wheel is small, so the impact cannot be alleviated.

[0005]

The main feature of the present invention is to provide a traveling wheel and a fan-shaped or bow-shaped auxiliary wheel which is larger than the traveling wheel and smaller than a diameter in contact with the ground and which floats from the ground. And Although it is a compact size caster that can be used for conventional strollers, wheelchairs, trolleys, etc., it is a wheel with a size similar to the diameter of this auxiliary wheel by getting on and off the step with fan-shaped and bow-shaped auxiliary wheels The effect is the same as that with.

[0006]

[Function] When traveling on a flat ground, the auxiliary fan-shaped wheels and the arched auxiliary wheels have a diameter smaller than the diameter of the ground and are floating from the ground.
It is the same operation as a conventional caster. However, there is a step higher than the intersection of the outer wheel of the traveling wheel and the outer wheel of the arcuate auxiliary wheel with the outer wheel of the traveling wheel, and when climbing this step,
The corner of the step should first contact the fan-shaped or bow-shaped auxiliary wheel that is urged and rotated forward by the tension spring, push up the turning constraint frame, and crimp the projecting brake with elastic brake receiver installed on the turning constraint frame. The turning is restricted by, and the fan-shaped and bow-shaped auxiliary wheels rotate and ride on the step. When descending a step, when the traveling wheel descends the corner of the step, the corner of the step comes into contact with the fan-shaped and arcuate auxiliary wheels, pushes up the turning restraint frame, and the brake with the protrusion and the elastic brake crimp to restrain the turning. Use the fan-shaped and bow-shaped auxiliary wheels to descend and descend the step.

[0007]

1 is a front view, FIG. 1 (B) is a side view, and FIG. 1 (C) is a perspective view. Attachment base 10 attached to the lower part of the traveling body
Has a vertical swivel axis 11 in its central part.
1, the central horizontal portion 22 of the main frame 20 having the leg portions 21, 21 on both sides is rotatably supported. Reference numeral 12 is a rolling ball in which the lower part of the central horizontal portion 22 of the main frame 20 is sandwiched between the lower part of the central frame 22 and a ball receiving disk 13 provided at the lower end of the turning shaft 11. It enables a smooth turn. The axle 31 of the traveling wheel 30 traveling on a flat ground is supported by the lower ends of both leg portions 21, 21.

The auxiliary frame 33 of the fan-shaped auxiliary wheel 34, which is the most important feature of the present invention, is supported behind the turning restraint frame 40,
The swivel restraint frame 40 has a downward U shape, and the swivel shaft 1 is provided at the center.
A hole 41 for passing 1 through is formed, and is swingably supported between the mounting base 10 and the main frame 20 by a swing shaft 32 supported in front of the main frame 20. At the upper part of the swivel restraint frame 40, a brake 42 with a protrusion having a hole 43 through which the swivel shaft 11 passes is formed in the center, and at the lower part of the mounting base 10, an elastic brake receiver 44 is provided on the opposite side of the brake with a swivel restraint. When the frame 40 is located closest to the main frame 20, a slight gap is provided between them.

The fan-shaped auxiliary wheel 34 has a diameter smaller than the diameter of the size in contact with the ground when the turning restraint frame 40 is located closest to the main frame 20, and is in a state of floating from the ground.
Therefore, when traveling on a flat ground, the vehicle travels only by the traveling wheels 30. If there is a step higher than the intersection of the outer ring of the traveling wheel 30 and the outer ring of the fan-shaped auxiliary wheel 34 in the forward direction of travel, the angle of the step will be forward by the tension spring 45 stretched between the fan-shaped auxiliary wheel 34 and the leg 21. The fan-shaped auxiliary wheel 34 and the turning restraint frame 40 are brought into contact with the fan-shaped auxiliary wheel front portion 36 that has been biased and rotated, and are pushed up. At this time, the brake 42 with a protrusion and the brake receiver 44 are pressed against each other, and the turning is restricted. When the fan-shaped auxiliary wheel 34 gets over the step and the corner of the step reaches the traveling wheel, the fan-shaped wheel 34 is biased and rotated by the action of the tension spring 45 to the original state, and the turning restraint frame 40 is also acted by the tension spring 45 and gravity. Return to the original state. Further, when there is a downward step ahead, the corner of the step comes into contact with the fan-shaped auxiliary wheel rear portion 37, and when it comes into contact with the fan-shaped auxiliary wheel front portion 36, turning is similarly restrained, and the fan-shaped auxiliary wheel 34 descends and descends.

FIG. 2 shows an embodiment of claim 2 and
(A) is a front view, (B) is a side view, and (C) is a perspective view. Reference numeral 23 denotes a main portion that is pivotally attached to the mounting base 10 by the swivel shaft 11 and can swivel horizontally about the swivel shaft 11.
Is a leg portion extending downward from the main portion 23. Reference numeral 35 is an arcuate auxiliary wheel. This is an embodiment in which the caster of claim 1 is a twin-wheel caster, and the actions and effects of the bow-shaped auxiliary wheel, the turning restraint frame and the like are the same as those of the caster of claim 1.

FIG. 3 shows an embodiment of claim 3, which is shown in FIG.
(A) is a front view of a caster in which the leg portions 21 and 21 are provided in the lower portion of the mounting base 10 and the auxiliary shaft 33 is supported by the leg portion 21, (B) is a side view, and (C) of FIG. Is a front view of a caster in which the leg portion 24 is provided in the lower portion of the mounting base 10 and the auxiliary shaft 33 is supported by the leg portion 24, and (D) is a side view.
The auxiliary shaft 33 of the fan-shaped and arcuate auxiliary wheels 35 and 36 is supported by the upper portion of the leg portion 21, 21 or 24 without the turning shaft 11 and the turning restraint frame 40. The fan-shaped and bow-shaped auxiliary wheels have a diameter smaller than the diameter in contact with the ground and are in a state of floating from the ground. Further, it is biased and rotated by a tension spring between the auxiliary wheel and the leg. It is a caster without a turning axis,
The action when overcoming a step is the same as in claim 1 or 2.

[0012]

When the caster of the present invention is attached to the trolley, the same effect as when a large diameter wheel is attached can be obtained without raising the position of the loading platform. Since the auxiliary wheels are substantially twice as many as the traveling wheels, the ability to climb over a step is more than double, and the impact when overcoming a step is surely reduced. In addition, even if the stroller or wheelchair is provided with wheels having a small diameter that does not come into contact with other components, it is possible to obtain the same effects as those provided with wheels having a diameter that cannot be provided conventionally. Is.

[Brief description of drawings]

FIG. 1 is an embodiment of claim 1, (A) is a front view,
(B) is a side view and (C) is a perspective view.

FIG. 2 is an embodiment of claim 2 (A) is a front view,
(B) is a side view and (C) is a perspective view.

3 is an embodiment of claim 3, (A) is a front view, (B) is a side view, (C) is a front view of a twin-wheel caster, and (D) is a side view of a two-wheel caster. ..

[Explanation of symbols]

 10 is a mounting base 11 is a turning shaft 12 is a rolling ball 13 is a ball receiving disk 20 is a main frame 21 is a leg 22 is a central horizontal part 23 is a main part 24 is a leg 30 is a traveling wheel 31 is an axle 32 is swinging Axis 33 is an auxiliary shaft 34 is a fan-shaped auxiliary wheel 35 is an arcuate auxiliary wheel 36 is an auxiliary wheel front part 37 is an auxiliary wheel rear part 40 A turning restraint frame 41 is a hole 42 is a brake with a protrusion 43 is a hole 44 is an elastic brake receiver 45 is Tension spring

Claims (3)

[Claims] 1. A mounting base 10 mounted on a lower part of a traveling body, and a main frame 20 pivotally mounted on the mounting base 10 by a turning shaft 11 and capable of turning horizontally about the turning shaft 11.
And both legs 21, 2 extending downward from both sides of the main frame 20 and horizontally supporting an axle 31 of a traveling wheel 30 between both legs.
1 and a swing shaft 32 provided in front of the main frame 20,
A turning restraint frame 40 capable of swinging between the main frame 20 and the mounting base 10 and a fan-shaped auxiliary wheel 34 supported by an auxiliary shaft 33 provided in the rear of the turning restraint frame 40 in parallel with the axle are provided. A brake 42 with a protrusion is provided on the upper mounting base side of the restraining frame 40, an elastic brake receiver 44 is provided on the lower turning restraining frame side of the mounting base 10, and the fan-shaped auxiliary wheel 34 has a diameter smaller than the diameter in contact with the ground. A tension spring 45 which is in a state of being floated from the ground and is stretched between the fan-shaped auxiliary wheel 34 and the leg portion 21.
The fan-shaped auxiliary wheels 34 are urged to rotate backward by a part of the traveling wheels to the front side of the traveling wheels, and when traveling on a flat ground, only the traveling wheels 30 travel, and the direction restraining frame 40 is at the lowest position. Equipped brake 42 and elastic brake receiver 44
When the step is in contact with the fan-shaped auxiliary wheel, the turning restraint frame 40 is pushed up and the brake with the protrusion and the elastic brake receiver are pressed against each other to prevent the turning. A caster whose main feature is to get on and off a step by the auxiliary wheel 34. 2. A main frame 20 and legs 21, 21 are pivotally mounted on a turning shaft 11 and can turn horizontally around the turning shaft 11, and traveling wheels 30 on both sides of the legs. Thirty
2. The caster according to claim 1, which is a twin-wheel caster, in which a leg 24 for horizontally supporting the axle 31 of the vehicle and a fan-shaped auxiliary wheel 34 for the auxiliary wheel 34 are changed to a twin-wheel caster. 3. The legs 21, 21 are provided at the bottom of the mounting base 10.
Or a leg portion 24 is provided, and the auxiliary shaft 33 is attached to the leg portions 21 and 21.
Alternatively, the caster according to claim 1 or 2, which is most mainly supported by the leg portion 24.