JP2001347801A - caster - Google Patents

Abstract

(57) [Problem] To provide a shock absorbing mechanism suitable for casters. SOLUTION: In a caster provided with a bracket connected to a vehicle body and a link supporting a wheel, a damper unit 20 is connected between the bracket and the link so as to be extendable and contractable, and the damper unit 20 is a cylindrical cylinder tube 21.
A rod-shaped rod 22 is inserted into the cylinder tube 21.
A first compressed rubber block 11 and a second compressed rubber block 12 are interposed between the
The first compressed rubber block 11 and the second compressed rubber block 12 are configured to be sequentially compressed and deformed as the shrinkage occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing mechanism for a caster mounted on, for example, a wheelchair, a stroller, a cart and the like.

[0002]

2. Description of the Related Art Conventionally, as a structure for absorbing an impact applied to a caster, a bracket connected to a vehicle body side, a link rotatably connected to the bracket and supporting a wheel,
Some include cushion rubber interposed between a bracket and a link.

[0003]

However, in such a conventional caster, the load applied and the shock absorbing effect are determined by the spring characteristics of the cushion rubber, and the initial operation is deteriorated because the cushion rubber is too hard. In addition, the cushion rubber is too soft to cause bottoming.

[0004] The present invention has been made in view of the above problems, and has as its object to provide a shock absorbing mechanism suitable for casters.

[0005]

SUMMARY OF THE INVENTION A first aspect of the present invention provides a bracket connected to a vehicle body, a link rotatably connected to the bracket, a wheel rotatably connected to the link, a bracket and a link. And a damper unit that is extendably connected between the first and second compression rubber blocks. The first compression rubber block and the second compression rubber block are inserted between the cylinder tube and the rod. The first compressed rubber block and the second compressed rubber block are sequentially compressed and deformed as the damper unit contracts.

According to a second aspect of the present invention, in the first aspect, the first compressed rubber block is formed in a cylindrical shape, the first compressed rubber block is interposed between the bottom of the cylinder tube and the rod, and the damper unit is compressed. In the process, the outer peripheral surface of the first compressed rubber block comes into contact with the inner wall surface of the cylinder tube.

In a third aspect based on the first or second aspect, the first compressed rubber block and the second compressed rubber block are interposed in the axial direction of the damper unit.

In a fourth aspect based on the third aspect, the second compressed rubber block is formed in a cylindrical shape, a rod protruding from a cylinder tube is inserted into the second compressed rubber block, and the second compressed rubber block is connected to the cylinder. It was arranged outside the tube.

In a fifth aspect based on the first or second aspect, at least one of the first compressed rubber block and the second compressed rubber block is formed in a cylindrical shape, and the first compressed rubber block and the second compressed rubber block are formed. Are arranged side by side inside and outside.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a third compressed rubber block is provided which is compressed and deformed as the damper unit is extended.

In a seventh aspect based on the sixth aspect, the third compressed rubber block is formed in a cylindrical shape, the rod inserted in the cylinder tube is inserted into the third compressed rubber block, and the third compressed rubber block is formed. It was arranged inside the cylinder tube.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, there is provided a compression deformation adjusting mechanism for adjusting the amount of compression deformation of at least one of the first compressed rubber block and the second compressed rubber block. It was taken.

According to a ninth aspect, in any one of the first to eighth aspects, a hydraulic damper is provided, in which hydraulic oil flows as the damper unit extends.

[0014]

According to the first aspect of the present invention, in response to the input to the caster, the damper unit causes the first compressed rubber block and the second compressed rubber block to expand and contract with each other, and the rubber block generated as a result. The swing of the link is attenuated by the internal friction, so that the impact and vibration received by the caster from the unevenness of the road surface can be effectively absorbed.

The damper unit is compressed according to the load applied to the caster, and the inclination of the link is determined. As the displacement of the link increases, the first compressed rubber block is compressed first, and the second compressed rubber block is subsequently compressed. Prevent bottoming.

The natural frequency of the vehicle body is expressed as a function of the vehicle weight and the spring constant of the damper unit. When the vehicle weight increases and the damper unit contracts, the spring constant also changes. Even so, it can be set so that the resonance phenomenon does not always occur.

According to the second aspect of the present invention, when the cylindrical first compressed rubber block is compressed in a state where the outer peripheral surface thereof is in contact with the inner wall surface of the cylinder tube, the elastic compressive deformation expanding inside is restricted. Instead, the change characteristic of the spring load can be changed by changing the inner diameter or the like of the first compressed rubber block, so that the degree of freedom in setting the caster's withstand load and cushioning characteristics can be increased.

According to the third aspect, since the first compressed rubber block and the second compressed rubber block are interposed between the cylinder tube and the rod in the axial direction, they can be prevented from interfering with each other. The degree of freedom in setting the load resistance and cushioning characteristics of the casters can be increased.

According to the fourth aspect of the present invention, since the cylindrical second compressed rubber block is fitted to the rod and arranged outside the cylinder tube, the size of the damper unit is increased by the second compressed rubber block. Can be avoided.

According to the fifth aspect, since the first compressed rubber block and the second compressed rubber block are arranged side by side inside and outside, for example, both can be interposed in the cylinder tube, and the compactness of the damper unit can be reduced. Is being measured.

According to the sixth aspect of the present invention, the third compressed rubber block contracts when the damper unit is extended, so that the link does not come into contact with the stopper of the bracket or the like, and the wheel receives an impact from the road surface. And absorb vibration.

According to the seventh aspect, since the third compressed rubber block having a cylindrical shape is fitted to the rod and arranged outside the cylinder tube, the third compressed rubber block can be elastically compressed and deformed by the cylinder tube. Can be constrained by the inner wall surface of the third compression rubber block.
The degree of freedom for setting the cushioning characteristics of the casters can be increased.

According to the eighth aspect, it is possible to adjust the amount of compressive deformation of the first compressed rubber block and the second compressed rubber block, to adjust the load resistance and the cushioning characteristics of the caster, and to prevent the caster from bottoming. At the same time, it is possible to effectively absorb vibrations and impacts that the wheels receive from the road surface.

According to the ninth aspect, as the damper unit expands and contracts, the damping force applied by the hydraulic damper and the damping force applied by the first compressed rubber block and the second compressed rubber block work together, Vibration and impact received by the wheels from the road surface can be effectively absorbed.

[0025]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a caster 1 is supported on a bracket 2 fastened to a vehicle body such as a bogie, a link 3 rotatably supported by the bracket 2, and a rotatably supported end of the link 3. Wheels 4. The caster 1 is not limited to a trolley for carrying luggage, but may be used for a wheelchair or a stroller, for example.

The bracket 2 has a U-shaped cross section and is fastened to the vehicle body via a bolt 5 penetrating the upper part. Alternatively, the bracket 2 may be connected via a bearing so as to be rotatable around a vertical axis, and the link 3 may be turned so that the wheel 4 is directed in the traveling direction.

The base end of the link 3 is supported by the bracket 2 via a pin 10 so as to be rotatable around a horizontal axis (vertical direction). A bolt 6 penetrating the link 3 is fastened to the tip of the link 3, and the wheel 4 is rotatably supported by the bolt 6 via a bearing (not shown).

A damper unit 20 is connected between the bracket 2 and the link 3 so as to be able to expand and contract. Damper unit 2
0 is a rod-shaped rod 22 in a cylindrical cylinder tube 21
Is inserted. As shown in FIG.
A cylinder end member 28 is attached to the open end of the rod 1, and the rod 22 is slidably supported via the cylinder end member 28. The proximal end of the cylinder tube 21 is rotatably connected to the bracket 2 via a pin 25, and the proximal end of the rod 22 is rotatably connected to the arm 3 via a pin 26.

The first compressed rubber block 11 and the second compressed rubber block 12 are interposed between the cylinder tube 21 and the rod 22, and the first compressed rubber block 11 and the second compressed rubber block 11 are contracted as the damper unit 20 contracts. The rubber block 12 is configured to be sequentially deformed by compression.

In the present embodiment, the first compressed rubber block 11 and the second compressed rubber block 12 are arranged inside and outside the cylinder tube 21 side by side in the axial direction of the damper unit 20.

The first compressed rubber block 11 is housed in a cylinder tube 21 and has a pair of spring seats 23,
24. The spring seat 23 is connected to the bottom of the cylinder tube 21 and the spring seat 24
Is connected to the end of the rod 22. The first compressed rubber block 11 is formed in a cylindrical shape, and each spring seat 23,
The first compressed rubber block 11 is supported coaxially with the cylinder tube 21 by inserting the columnar projections 23 a and 24 a protruding from the 24 into the holes 27 opened at both ends of the first compressed rubber block 11. .

As shown in the figure, a radial gap 1 is formed between the inner wall surface of the cylinder tube 21 and the outer peripheral surface of the first compressed rubber block 11 in a free state in which the damper unit 20 is substantially extended.
8 and the inner wall surface of the cylinder tube 21 and the first compressed rubber block 1 during the contraction of the damper unit 20.
The outer peripheral surfaces of the first compressed rubber blocks 11 are in contact with each other so that the elastic compression deformation of the first compressed rubber block 11 is restricted.

The second compressed rubber block 12 is formed in a cylindrical shape, and is interposed between the cylinder end member 28 and the rod end portion 29. The rod 22 is the second compressed rubber block 1
The second compressed rubber block 12 is supported coaxially with the cylinder tube 21 by being inserted into the hole 19 opened to the second.

As shown in the figure, an axial gap 14 is provided between the rod end portion 29 and the second compressed rubber block 12 in a free state in which the damper unit 20 is substantially extended, and the damper unit 20 is contracted in the process of contracting. The rod end portion 29 abuts on the end face of the second compressed rubber block 12 to compress the second compressed rubber block 12.

The hardness or shape of the first compressed rubber block 11 and the second compressed rubber block 12 is arbitrarily set according to the load resistance and cushioning characteristics required for the casters 1.

FIG. 3 is a characteristic diagram showing the relationship between the amount of displacement of the damper unit 20 and the spring load, and has a non-linear characteristic in which the rate of increase of the spring load with respect to the amount of displacement increases stepwise. This means that when the damper unit 20 contracts, only the first compressed rubber block 11 is initially compressed,
Subsequently, the first compressed rubber block 11 and the second compressed rubber block 12 are both compressed. Then, as the damper unit 20 contracts, the first compressed rubber block 11 abuts on the inner wall surface of the cylinder tube 21 and is gradually restrained, whereby the rate of increase of the spring load with respect to the displacement increases.

The damper unit 20 is configured as described above, and in response to the input to the caster 1, the first compressed rubber block 11 and the second compressed rubber block 12 expand and contract with each other.
The swing of the link 3 is attenuated by the internal friction of the rubber block caused by this, and the impact and vibration received by the caster 1 from irregularities on the road surface can be effectively absorbed.

The damper unit 20 is compressed according to the load applied to the caster 1, and the inclination of the link 3 is determined. The damper unit 20 is configured such that the first compressed rubber block 11 is compressed first and the second compressed rubber block 12 is subsequently compressed, so that the displacement amount of the damper unit 20 increases as shown in FIG. Since the spring load suddenly increases, the bottom of the link 3 colliding with the bracket 2 is prevented.

The natural frequency of the vehicle body is expressed as a function of the vehicle weight and the spring constant of the damper unit 20, but the spring constant changes as the vehicle weight increases and the damper unit 20 contracts. It can be set so that the resonance phenomenon does not occur.

Since the first compressed rubber block 11 and the second compressed rubber block 12 are interposed between the cylinder tube 21 and the rod 22 in the axial direction, they can be prevented from interfering with each other. The degree of freedom in setting the load resistance and the cushioning characteristics of the caster 1 can be increased.

Next, another embodiment shown in FIG. 4 will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals.

In this embodiment, the cylinder tube 21
The first compressed rubber block 11, the second compressed rubber block 12, and the third compressed rubber block 13 are interposed between the first compressed rubber block 11 and the rod 22 in the axial direction, and the first compressed rubber block is contracted as the damper unit 20 contracts. The block 11 and the second compressed rubber block 12 are sequentially compressed and deformed, while the third compressed rubber block 13 is compressed and deformed as the damper unit 20 expands.

The cylindrical third compressed rubber block 13 allows the rod 22 to slidably pass therethrough, and the cylinder end member 28
And the spring seat 24.

The disc-shaped spring seats 23 and 24 have no positioning projections or the like, and the both end faces of the cylindrical first compressed rubber block 11 are fixed by vulcanization bonding or the like.

In this case, when the damper unit 20 expands, the third compressed rubber block 13 contracts, so that the link does not come into contact with the stopper of the bracket or the like, and the impact that the caster receives from the road surface is reduced. Absorb vibration.

Next, another embodiment shown in FIG. 5 will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals. Also in the present embodiment, the first compressed rubber block 11, the second compressed rubber block 12, and the third compressed rubber block 13 are arranged in the axial direction between the cylinder tube 21 and the rod 22, similarly to the embodiment shown in FIG. The first compressed rubber block 11 and the second compressed rubber block 12 are sequentially compressed and deformed as the damper unit 20 contracts, while the third compressed rubber block is extended as the damper unit 20 expands. 13 undergoes compression deformation.

The first compressed rubber block 11 is formed in a cylindrical shape and has a hole 38 extending in the axial direction. The first compressed rubber block 11 is interposed between the bottom of the cylinder tube 21 and the spring seat 24.

The first compressed rubber block 11 has a hole 38 in which one end is fitted to a rod end member 37 attached to the tip of the rod 22, and the other end of the hole 38 projects from the bottom of the cylinder tube 21. Positioning is performed by fitting to the columnar convex portion 21 a, which is supported coaxially with the cylinder tube 21.

As shown in the drawing, when the damper unit 20 is at the intermediate stroke position in a free state, a radial gap 18 is provided between the inner wall surface of the cylinder tube 21 and the outer peripheral surface of the first compressed rubber block 11. In the process of contraction, the inner wall surface of the cylinder tube 21 and the outer peripheral surface of the first compressed rubber block 11 come into contact with each other, so that the elastic compression deformation of the first compressed rubber block 11 is gradually restricted according to the stroke. I have.

The second compressed rubber block 12 is formed in a cylindrical shape and has a hole 19 extending in the axial direction. The second compressed rubber block 12 is interposed between the cylinder end member 28 and the rod end member 39. The second compressed rubber block 12 is supported coaxially with the cylinder tube 21 by slidably inserting a rod 22 into the hole 19. As shown in the figure, when the damper unit 20 is in the intermediate stroke position in a free state, an axial gap 14 is provided between the rod end portion 29 and the second compressed rubber block 12, and the rod end portion is contracted in the process of contracting the damper unit 20. The portion 29 abuts on the end face of the second compressed rubber block 12 to compress the second compressed rubber block 12.

The third compressed rubber block 13 is formed in a cylindrical shape and has a hole 59 extending in the axial direction. The third compressed rubber block 13 is interposed between the cylinder end member 28 and the spring seat 24. Third compressed rubber block 13
Is supported coaxially with the cylinder tube 21 by slidably inserting the rod 22 into the hole 59. As shown in the figure, a gap 58 is provided between the inner wall surface of the cylinder tube 21 and the outer peripheral surface of the third compressed rubber block 13 when the damper unit 20 is at the intermediate stroke position in a free state,
As the damper unit 20 contracts, the inner wall surface of the cylinder tube 21 and the outer peripheral surface of the third compressed rubber block 13 come into contact with each other, so that the elastic compression deformation of the third compressed rubber block 13 is gradually restricted according to the stroke. Has become.

In this case, since the first compressed rubber block 11 is formed in a cylindrical shape and is interposed between the bottom of the cylinder tube 21 and the spring seat 24, the first compressed rubber block 11 has an outer peripheral surface. Is the cylinder tube 2
When it is compressed in a state in which it is in contact with the inner wall surface, elastic compression deformation that expands inward occurs. By changing the diameter of the hole 38, the change characteristic of the spring load can be changed, so that the degree of freedom in setting the load resistance and the cushioning characteristic of the caster 1 can be increased.

The second compressed rubber block 12 is formed in a cylindrical shape, a rod 22 protruding from the cylinder tube 21 is inserted into the second compressed rubber block 12, and the second compressed rubber block 12 is arranged outside the cylinder tube 21. Due to the structure, the size of the damper unit 20 can be prevented from being increased by the second compressed rubber block 12.

Since the third compressed rubber block 13 is formed in a cylindrical shape and the rod 22 inserted into the cylinder tube 21 is inserted into the third compressed rubber block 13, elastic compression deformation of the third compressed rubber block 13 is prevented. It is possible to restrict the inner wall surface of the cylinder tube 21, and by changing the outer diameter of the third compressed rubber block 13, it is possible to change the change characteristic of the spring load, thereby increasing the degree of freedom in setting the cushioning characteristic of the caster 1.

Next, another embodiment shown in FIG. 6 will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals.

In this embodiment, the cylinder tube 21
A first compressed rubber block 11 having a cylindrical shape and a second compressed rubber block 12 having a cylindrical shape are interposed inside and outside, and the first compressed rubber block 11 and the second compressed rubber block 11 are contracted as the damper unit 20 contracts. The rubber block 12 is configured to be sequentially deformed by compression.

The first compressed rubber block 11 and the second compressed rubber block 12 are sandwiched between a pair of spring seats 33,34. Disc-shaped spring seats 33,3
Numeral 4 has annular convex portions 35 and 36, both ends of the first compressed rubber block 11 having a cylindrical shape are inserted inside the convex portions 35 and 36, and a cylindrical shape is formed outside the convex portions 35 and 36. Both ends of the second compressed rubber block 21 are fitted, and the first compressed rubber block 11 and the second compressed rubber block 12 are supported coaxially with the cylinder tube 21.

As shown in the figure, when the damper unit 20 is substantially extended and in a free state, a predetermined gap 32 is provided between the end face of the second compressed rubber block 12 and the spring seat 34, and the damper unit 20 contracts. Thus, the second compressed rubber block 12 comes into contact with the spring seat 34 and is elastically compressed and deformed.

Similarly, a predetermined gap 31 is provided between the inner wall surface of the cylinder tube 21 and the outer peripheral surface of the second compressed rubber block 12 in a state where the damper unit 20 is in the most extended state. The inner wall surface of the cylinder tube 21 and the outer peripheral surface of the second compressed rubber block 12 are in contact with each other, so that the elastic compression deformation of the second compressed rubber block 12 is restricted.

In this case as well, as the damper unit 20 contracts, the first compressed rubber block 11 is compressed first, and the second compressed rubber block 12 is subsequently compressed, so that the bottom of the caster is reduced. In addition to preventing vibrations, it effectively absorbs vibrations and shocks that the casters receive from the road surface.

Since the first compressed rubber block 11 and the second compressed rubber block 12 are arranged inside and outside the cylinder tube 21, the size of the damper unit 20 can be reduced.

Next, another embodiment shown in FIG. 7 will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals.

In this embodiment, a compression deformation adjusting mechanism 40 for adjusting the amount of compression deformation of the first compressed rubber block 11 and the second compressed rubber block 12 is provided.

The first compressed rubber block 11 is sandwiched between the spring seats 44 and 45, and the second compressed rubber block 12 is sandwiched between the spring seats 44 and 46. As the compression deformation adjusting mechanism 40, a cylindrical adjusting sleeve 47 is interposed between the spring seats 45 and 47. Screw portions are formed on the inner and outer circumferences of the adjusting sleeve 47, and each screw portion is screwed to the outer circumference of the spring seat 45 and the inner circumference of the spring seat 46, respectively.
A knock pin 48 is interposed between the spring seat 46 and the cylinder tube 21 to prevent rotation of both.

By changing the screwing position of the spring seat 45 with the adjusting sleeve 47 by rotating the spring seat 45, the spring seat 45 is displaced in the axial direction, and the initial compression amount of the first compressed rubber block 11 is adjusted. . The spring seat 45 is fastened to the adjusting sleeve 47 via a lock nut 49.

When the adjusting sleeve 47 is rotated to change the screwing position of the spring seat 46 with the adjusting sleeve 47, the spring seat 46 is displaced in the axial direction, and the position between the end face of the second compressed rubber block 12 and the spring seat 44 is changed. The gap 42 is adjusted. The adjusting sleeve 47 is fastened via the lock nut 43.

In this case, for example, it is possible to adjust the load-carrying capacity and the shock-absorbing characteristics of the casters according to the weight of the person in the wheelchair, so that the casters can be prevented from bottoming and the casters can receive vibrations and impacts from the road surface. Can be effectively absorbed.

Next, another embodiment shown in FIG. 8 will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals.

In the present embodiment, the cylinder tube 21
A cylindrical second compressed rubber block 12 and a first compressed rubber block 11 are arranged inside and outside of the cylinder tube 21 outside, and hydraulic oil is filled into the cylinder tube 21 to constitute a hydraulic damper 50.

The first compressed rubber block 11 and the second compressed rubber block 12 are connected to a pair of spring carriers 53, 54.
Sandwiched between. The spring carrier 53 is connected to the outer periphery of the cylinder tube 21 and includes a spring carrier 54.
Is connected to the rod end portion 29.

As shown in the drawing, the first compressed rubber block 11 is interposed between the spring carriers 53 and 54 in a compressed state in which the damper unit 20 is substantially fully extended.

Similarly, a predetermined gap 52 is provided between the end face of the second compressed rubber block 12 and the spring carrier 53 in a state where the damper unit 20 is in the most extended state. The block 12 abuts on the spring carrier 54 and is elastically compressed and deformed.

Similarly, with the damper unit 20 in the most extended state, a predetermined gap 5 is provided between the inner wall surfaces of the spring carriers 53 and 54 and the outer peripheral surface of the first compressed rubber block 11.
5 and 56 are provided, and the inner wall surfaces of the spring carriers 53 and 54 come into contact with the outer peripheral surface of the first compressed rubber block 11 in the process of contracting the damper unit 20, and the first compressed rubber block 11 is elastically compressed and deformed. Is to be restrained.

As the hydraulic damper 50, a piston 57 is connected to the tip of the rod 22.
The interior is partitioned by a piston 57 into two oil chambers. As the damper unit 20 expands and contracts, the hydraulic oil flows between the oil chambers through the orifice or the annular gap, and applies a damping force. Cylinder tube 21
The inside is filled with a gas, and absorbs the working oil corresponding to the intrusion volume of the rod 22.

In this case, as the damper unit 20 expands and contracts, the damping force applied by the hydraulic damper 50 and the damping force applied by the first compressed rubber block 11 and the second compressed rubber block 12 work together, Vibrations and shocks that the casters receive from the road surface can be effectively absorbed.

The cylinder tube 2 is filled with high-viscosity hydraulic oil such as silicone oil having a high compression ratio as the hydraulic oil.
A configuration may be adopted in which the spring load of the damper unit 20 is shared by the pressure rise in 1. Silicone oil is a synthetic oil having a dimethylpolysiloxane structure, and its viscosity increases rapidly under pressure and has a higher compression ratio than organic oils. In this case, there is no need to fill gas into the hydraulic damper.

Further, three or more compressed rubber blocks may be sequentially compressed when the damper unit contracts.

The damper unit 2 shown in FIGS.
Regarding 0, a third compressed rubber block that compresses and deforms as it expands may be interposed.

It is apparent that the present invention is not limited to the above-described embodiment, and that various changes can be made within the scope of the technical concept.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the damper unit.

FIG. 3 is a characteristic diagram showing a relationship between a displacement amount of a link and a spring load of a compression rubber block.

FIG. 4 is a cross-sectional view of a damper unit showing another embodiment.

FIG. 5 is a cross-sectional view of a damper unit showing another embodiment.

FIG. 6 is a cross-sectional view of a damper unit showing another embodiment.

FIG. 7 is a sectional view of a damper unit according to another embodiment.

FIG. 8 is a side view of a damper unit showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Caster 2 Bracket 3 Link 4 Wheel 11 First compression rubber block 12 Second compression rubber block 13 Third compression rubber block 20 Damper unit 21 Cylinder tube 22 Rod 40 Compression deformation adjusting mechanism 50 Hydraulic damper

Claims (9)

[Claims] A bracket connected to the vehicle body; a link rotatably connected to the bracket; a wheel rotatably connected to the link; and a telescopic member between the bracket and the link. A damper unit to be connected, the damper unit inserts a rod into a cylindrical cylinder tube, a first compressed rubber block and a second compressed rubber block interposed between the cylinder tube and the rod, A caster, wherein the first compressed rubber block and the second compressed rubber block are sequentially compressed and deformed as the damper unit contracts. 2. The first compressed rubber block is formed in a cylindrical shape, the first compressed rubber block is interposed between the bottom of the cylinder tube and the rod, and the damper unit is compressed during the compression process. The caster according to claim 1, wherein an outer peripheral surface of the first compressed rubber block is in contact with an inner wall surface of the cylinder tube. 3. The caster according to claim 1, wherein the first compressed rubber block and the second compressed rubber block are interposed in the axial direction of the damper unit. 4. The second compressed rubber block is formed in a cylindrical shape, the rod protruding from the cylinder tube is inserted into the second compressed rubber block, and the second compressed rubber block is placed outside the cylinder tube. The caster according to claim 3, wherein the casters are arranged. 5. At least one of said first compressed rubber block and said second compressed rubber block is formed in a cylindrical shape, and said first compressed rubber block and said second compressed rubber block are interposed inside and outside. Claim 1 characterized by the following:
Or the caster according to 2. 6. The caster according to claim 1, further comprising a third compressed rubber block that is compressed and deformed as the damper unit is expanded. 7. The third compressed rubber block is formed in a cylindrical shape, the rod inserted into the cylinder tube is inserted into the third compressed rubber block, and the third compressed rubber block is placed inside the cylinder tube. The caster according to claim 6, wherein the caster is arranged at a position. 8. The apparatus according to claim 1, further comprising a compression deformation adjusting mechanism for adjusting a compression deformation of at least one of said first compressed rubber block and said second compressed rubber block.
The caster according to any one of items 1 to 7. 9. The caster according to claim 1, further comprising a hydraulic damper through which hydraulic oil flows as the damper unit extends.