JPH11314570A - Carrier vehicle with impact absorbing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance riding comfort and the like by letting impact received from the ground through each caster be absorbed and relaxed by a simple structure. SOLUTION: This is a wheel chair with an impact absorbing device provided with a mounting plate 5 fixed to car body frames 3 and 4, and with an impact absorbing device 9 to be mounted to the mounting plate 5. The impact absorbing device 9 is equipped with a case 11 to be fixed to the mounting plate 5, a movable member which is housed in the inside of the case 11 in such a way as to be moved up and down, and has a vertical shaft part 1a of a caster 1 connected thereto, a stationary member to be fixed to the inside of the case 11, and with an elastic member disposed to a space formed between the movable member and the stationary member in the inside of the case 11, and impact received by the caster 1 from the floor surface 100 is thereby absorbed by the elastic deformation of the elastic member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier equipped with a shock absorbing device for absorbing and reducing the impact of a caster from a road surface.

[0002]

When a carrier such as a wheelchair or a stretcher travels on a stepped road surface,
In some cases, the caster receives an impact from the road surface, hinders the ride comfort of the user or has a physical adverse effect on the user.

[0003] In view of the above problems, the present invention provides a carrier such as a wheelchair or a stretcher capable of absorbing and reducing the impact of a caster from a road surface with a simple structure and improving ride comfort. It is done for the purpose of.

[0004]

According to the present invention, there is provided a carrier with a shock absorbing device, wherein a shock absorbing device is provided between a vehicle body frame and a caster, and the shock absorbing device has a case fixed to the vehicle body frame side. A movable member housed in the case so as to be vertically movable and connected to a vertical shaft of a caster, a fixed member fixed inside the case, and the movable member and the fixed member inside the case. And an elastic member disposed in a space formed between the caster and the caster, wherein the caster absorbs an impact received from a floor surface by elastic deformation of the elastic member.

[0005] Further, another carrier with a shock absorbing device of the present invention is provided with a shock absorbing device between a body frame and a caster, the shock absorbing device is constituted by a hydraulic damper and a spring, and the caster is mounted on a floor. It is characterized in that it is configured to absorb an impact received from a vehicle.

[0006]

FIG. 1 is a side view of a main part of a wheelchair as an embodiment of a carrier with a shock absorbing device according to the present invention.
FIG. 2 is a cross-sectional view showing the internal structure of a shock absorbing device in the wheelchair, FIG. 3 is a cross-sectional view of a main part of a carrier with a shock absorbing device according to another embodiment, and FIG. It is sectional drawing of the principal part of the conveyance vehicle with an impact absorption device which concerns on FIG.

1 and 2, reference numeral 1 denotes a conventional caster which is a right front wheel of a wheelchair, 2 denotes a footrest, 3 denotes a right horizontal frame of a body frame, 4
Indicates a right vertical frame extending vertically from the right horizontal frame.

A mounting plate 5 is fixed to two positions on the outer side surface of the right horizontal frame 3 and one position on the outer side surface of the right vertical frame 4 by mounting brackets 6, 7, and 8. A shock absorbing device 9 is provided on the outer side surface of the mounting plate 5.
Are attached by mounting brackets (not shown). The caster 1 is attached to the shock absorbing device 9. Although not shown, the shock absorbing device 9 is also attached to the mounting plate 5 on the left side of the wheelchair, and the conventional caster 1 is attached to the shock absorbing device 9.

The shock absorbing device 9 has a case 11 fixed to the mounting plate 5. A movable member 12 is housed inside the case 11 so as to be vertically movable. Movable member 1
Reference numeral 2 denotes a cylindrical member 13 in which the vertical shaft portion 1a of the caster 1 is accommodated and connected in the hollow portion, and a rod-shaped member in which the lower male screw portion 14a is screwed into the upper female screw portion 13a of the cylindrical member 13 to be integrated. 14 and a cylindrical resin bearing (slide bearing) 1 which is externally provided on the cylindrical member 13
5 and a retaining ring 16 for preventing the resin bearing 15 from coming off
It is composed of Flange part 13b of cylindrical member 13
An O-ring 17 as a cushion material is mounted between the housing 11 and the bottom surface 11a of the case 11.

Further, a fixing member 18 is fixed inside the case 11. The fixing member 18 includes a cylindrical stopper member 19 and a fixing nut 20.
The stopper member 19 is screwed into a female screw portion 11b formed on the upper inner peripheral surface of the case 11 with the rod-shaped member 14 of the movable member 12 inserted through the hollow portion. The fixing nut 20 is screwed into the male screw portion 19 a of the stopper member 19 to fix the stopper member 19 to the case 11.

A space 21 is formed between the lower end surface 19b of the stopper member 19 and the upper end surface 13c of the cylindrical member 13, and a coil spring 22 as an elastic member is provided on the rod member 14 in this space 21. Is arranged.

The shock absorbing device 9 configured as described above
When the caster 1 receives an impact from the floor surface 100, the cylindrical member 13 moves upward via the vertical shaft portion 1a of the caster 1, and the coil spring 22 undergoes compression elastic deformation. Due to the elastic deformation of the coil spring 22, the impact received by the caster 1 is absorbed and reduced, and the riding comfort can be improved.

By adjusting the amount of screwing of the stopper member 19 into the case 11, the vertical spacing of the space 21 can be adjusted, and the initial compression and repulsive force of the coil spring 22 can be adjusted.

The shock absorbing device 9 shown in FIG. 3 uses a rubber ring 23 and a washer 24 instead of the coil spring 22 as an elastic member. Further, the shock absorbing device 9 shown in FIG. 4 uses a cylindrical rubber 25 as an elastic member. In any case, the same action as the above-described coil spring 22 can be exhibited, and the riding comfort can be improved.

In the above-described embodiment, the shock absorbing device 9 is fixed to the body frames 3, 4 via the mounting plate 5, but the shock absorbing device 9 is fixed directly to the body frame by welding or the like. In this case, the same operation and effect as in the above embodiment can be achieved.

FIG. 5 shows a configuration of a shock absorbing device of a carrier with a shock absorbing device according to another embodiment.

In FIG. 5, the shock absorbing device 9 has a cylindrical case 11, in which a hydraulic damper 30 is fixed by screws 31.

The hydraulic damper 30 is of a type whose absorption characteristics can be adjusted. As shown in FIG. 6, an inner tube 32, an orifice 33 formed in the inner tube 32, and a sliding member with respect to the inner tube 32. Possible piston 34, piston rod 35 and adjusting shaft 36
, Inner tube 32, piston 34 and adjustment shaft 3
6, a return spring 38 disposed in the pressure chamber 37, and an absorption characteristic adjusting portion 39 for adjusting the flow rate of oil flowing out of the pressure chamber 37 according to the rotational position of the adjustment shaft 36. , An adjusting knob 40 for rotating the adjusting shaft 36 and an accumulator 41 as main components.

The lower end of the piston rod 35 is connected to a caster mounting member 42. Caster mounting member 42
A vertical shaft portion 1a of the caster 1 is detachably fixed to a lower part of the caster. The caster mounting member 42 can move up and down in the case 11, and its lowered position is regulated by a stopper 43.

A spring 44 is provided between the upper end surface 42a of the caster mounting member 42 and the step surface 30a of the hydraulic damper 30. When the caster 1 receives an impact from the floor, the spring 44 reduces the impact together with the hydraulic damper 30 and then quickly returns the hydraulic damper 30 to its original state.

In the wheelchair with the shock absorbing device configured as described above, when an impact force is applied to the caster 1 from the floor surface, the oil rises out of the pressure chamber 37 through the orifice 33 due to the rise of the piston 34 in the hydraulic damper 30. The impact force is reduced, and the elastic force of the spring 44 also reduces the impact force. Then, the position of the caster 1 returns to the original position by the elastic return force of the elastically deformed spring 44.

In each of the above-described embodiments, the case where the shock absorbing device is provided on the wheelchair has been described. However, even when the above-described shock absorbing device is provided on the stretcher instead of the wheelchair, the same ride as described above is performed. Comfort can be improved.

[0023]

According to the present invention, the impact of the caster from the road surface can be absorbed and reduced by a simple structure, so that the riding comfort can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a carrier with an impact absorbing device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an internal structure of the shock absorbing device in the wheelchair.

FIG. 3 is a cross-sectional view of a main part of a carrier with a shock absorbing device according to another embodiment.

FIG. 4 is a cross-sectional view of a main part of a carrier with an impact absorbing device according to still another embodiment.

FIG. 5 is a configuration diagram of a shock absorbing device of a carrier with a shock absorbing device according to another embodiment.

FIG. 6 is a configuration diagram of a hydraulic damper of the shock absorbing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Caster 1a Vertical shaft part 3, 4 Body frame 5 Mounting plate 9 Shock absorber 11 Case 12 Movable member 18 Fixed member 21 Space 22 Coil spring (elastic member) 23 Rubber ring (elastic member) 24 Washer (elastic member) 25 cylinder Rubber (elastic member) 30 Hydraulic damper 44 Spring 100 Floor

Claims (7)

[Claims] An impact absorbing device is provided between a vehicle body frame and a caster. The impact absorbing device is housed in a case fixed to the vehicle body frame side, and is accommodated in the case so as to be movable up and down. A movable member to which a vertical shaft portion is connected, and a fixed member fixed inside the case,
An elastic member disposed in a space formed between the movable member and the fixed member inside the case,
A carrier equipped with a shock absorbing device, wherein the caster is configured to absorb a shock received from a floor surface by elastic deformation of the elastic member. 2. The carrier according to claim 1, wherein the case is fixed to a mounting plate fixed to the vehicle body frame. 3. The carrier according to claim 1, wherein the elastic member comprises a coil spring. 4. The carrier with an impact absorbing device according to claim 3, wherein a fixing position of the fixing member with respect to the case is adjustable, and a size of the space is adjustable. 5. The transport vehicle according to claim 1, wherein the elastic member comprises a rubber ring and a washer. 6. The vehicle according to claim 1, wherein the elastic member is made of a cylindrical rubber. 7. A shock absorbing device is provided between a vehicle body frame and a caster, wherein the shock absorbing device is constituted by a hydraulic damper and a spring, and is configured to absorb a shock received from the floor by the caster. Transport vehicle with a shock absorber.