JP2000118407A - Carriage and travel assisting device for carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably vary a support height of an auxiliary wheel against a load by connecting a booster for amplifying operation force between an operation lever and the auxiliary wheel. SOLUTION: A carriage is composed of the carriage part A composed of a hand-push type having no travel driving part and the travel assisting part B attachable to the carriage part A. The carriage part A is composed of a flat cargo mounting stage 1 capable of placing a cargo on the upper surface, a hand-push arm 2 erected in the rear part of the cargo mounting stage 1 and traveling wheels supported in the front part and the rear part on the under surface of the cargo mounting stage 1. The travel assisting part B is composed of an operation lever 4, a connecting link 5, a booster (a rod 6, a hydraulic pump 7 and a hydraulic cylinder 8), an auxiliary wheel 9 and an installing bracket 10. Original operation force is amplified by the booster (the rod 6, the hydraulic pump 7 and the hydraulic cylinder 8). Thus, even in a state of placing a cargo on the cargo mounting stage 1, a support height of the auxiliary wheel 9 can be reliably varied against a load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to a technical field related to a step traveling of a truck carrying a load.

[0002]

2. Description of the Related Art Conventionally, as a bogie, for example, a bogie described in JP-A-10-181609 is known.

[0003] In this conventional truck, a traveling wheel and an auxiliary wheel are supported on the lower surface of the luggage mounting table, and the supporting height of the auxiliary wheel on the luggage mounting table can be changed by an operation lever.
By raising the supporting height of the auxiliary wheels and lifting the running wheels from the running surface, it is possible to get over a step.

[0004]

In the above-described conventional bogie, since the operating force of the operating lever is transmitted to the auxiliary wheels via a link mechanism or the like, the operating lever is operated in a load state in which the load is placed on the load carrier. However, there is a problem in that the supporting height of the auxiliary wheels cannot be reliably changed against the load even if the user operates.

The present invention has been made in consideration of the above problems, and a trolley capable of reliably changing the supporting height of the auxiliary wheels against a load, and a supporting height of an existing trolley. An object of the present invention is to provide a trolley traveling assist device that can be equipped with wheels or the like having a variable function.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, a truck according to the present invention employs the following means.

That is, according to a first aspect of the present invention, there is provided a bogie in which a traveling wheel and an auxiliary wheel are supported on a lower surface of the luggage mounting table, and a supporting height of the auxiliary wheel on the luggage mounting table is changed by an operation lever. And a booster for amplifying the operation force is connected between the operation lever and the auxiliary wheel.

In this means, since the operating force of the operating lever is amplified by the booster and transmitted to the auxiliary wheels, the supporting height of the auxiliary wheels can be reliably changed against the load.

Further, as described in claim 2, claim 1
In the bogie, the booster includes a rod connected to the operation lever, a fluid pressure pump connected to the rod, and a built-in fluid is pressurized by the rod, and a fluid pressure connected to the auxiliary wheel connected to the fluid pressure pump to the fluid pressure. And a responsive hydraulic cylinder.

In this means, the booster is constructed in a simple fluid pressure responsive structure.

[0011] Further, as described in claim 3, claim 1
Alternatively, in the trolley of the second aspect, the operation lever is supported by a rear portion of the luggage carrier and is formed in a foot pedal shape.

According to this means, a large original operating force can be obtained from the operating lever formed in the shape of a foot pedal.

Further, in order to solve the above-mentioned problems, a traveling assistance device for a truck according to the present invention employs the following means.

That is, as described in claim 4, claim 1
An operation lever, an auxiliary wheel, and a booster provided on any one of the trucks of (1) to (3) can be equipped with a mounting bracket on the lower surface of the luggage carrier.

[0015] In this means, the auxiliary wheels and the like are mounted on the existing bogie with the mounting bracket.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a truck and a traveling assist device for a truck according to the present invention will be described below with reference to the drawings.

In this embodiment, a carriage unit A of a known hand-operated type having no traveling drive unit is provided, and a traveling auxiliary unit B detachable from the carriage unit A.

The carriage unit A includes a flat luggage mounting table 1 on which luggage can be placed on the upper surface, a hand pushing arm 2 erected at the rear of the luggage mounting table 1, and a front part of the lower surface of the luggage mounting table 1. , And running wheels 3 respectively supported at the rear.

The travel assisting section B comprises an operating lever 4, a connecting link 5, a booster (rod 6, hydraulic pump 7, hydraulic cylinder 8), auxiliary wheels 9, and a mounting bracket 10.

The operation lever 4 is formed in the shape of a foot pedal for putting down a foot and pressing it down, and is attached to a rear portion of the lower surface of the luggage carrier 1 (see FIG. 3).

The connecting link 5 is composed of a plurality of link arms, link shafts and the like, and connects the operating lever 4 and the rod 6.

The rod 6 is made of a straight rod member, is connected to the connecting link 5 and is disposed along the lower surface of the luggage carrier 1 toward the front, and moves downward to depress the operating lever 4. Performs a forward movement of sliding to the front side.

The hydraulic pump 7 is of a cylinder type. The hydraulic pump 7 is disposed on the extension side of the rod 6 and presses the built-in oil when the rod 6 moves forward.

The hydraulic cylinder 8 is of a cylinder rod retractable type. The hydraulic cylinder 8 is rotatably mounted on the front side of the lower surface of the luggage mounting table 1 and advances the cylinder rod with pressurized oil. As shown in detail in FIG. 2, the hydraulic cylinder 8 includes a check valve 8a for preventing a backflow of oil inside. An operation piece 8b for holding and releasing the check function is connected to the check valve 8a. The operation piece 8b is arranged adjacent to the operation lever 4.

The auxiliary wheel 9 comprises a support arm 9a and a wheel 9b. The support arm 9a is rotatably supported at a substantially intermediate portion on the front side and the rear side of the lower surface of the luggage carrier 1 so as to be rotatable. The hydraulic cylinder 8 extends downward and rotates downward when the cylinder rod of the hydraulic cylinder 8 advances, so that the supporting height is increased.
As shown in detail in FIG. 4, the auxiliary wheel 9 includes a reverse rotation preventing mechanism 9c for preventing reverse rotation between the support arm 9a and the wheel 9b.

The mounting bracket 10 is composed of an L-shaped piece, a T-shaped piece, etc., and includes the operating lever 4, the connecting link 5, the rod 6, the hydraulic pump 7, the hydraulic cylinder 8, and the auxiliary wheel 9 in the luggage mounting table 1. (See FIG. 5).

According to this embodiment, the traveling assisting section B can be easily mounted on the bogie section A of a known manually pushed type by using the mounting bracket 10.
Moreover, since the equipment is provided on the lower surface of the luggage mounting table 1, the equipment is not obstructed by other parts. In addition, since the travel assisting portion B is configured with a simple fluid pressure responsive structure, it can be manufactured at low cost and easily.

When the truck A is equipped with the travel assist B,
Similarly to the above-described conventional example, by operating the operation lever 4, the supporting height of the auxiliary wheel 9 is increased, so that the traveling wheel 3 is lifted off the traveling surface R, and the vehicle can climb over a step (FIG. 1B). reference).

At this time, the operation lever 4 is in the form of a foot pedal, and the original operation force can be increased. In addition, the original operating force is amplified by the booster (rod 6, hydraulic pump 7, hydraulic cylinder 8). Therefore, even when the load is placed on the load table 1, the supporting height of the auxiliary wheels 9 can be reliably changed against the load.

The reverse rotation preventing mechanism 9c provided on the auxiliary wheel 9 is provided with a reverse rotation force (rotational force in the direction opposite to the running direction) applied to the wheels 9b by the inclination of the luggage mounting table 1 when climbing over a step. ) Is prevented from rotating. Therefore, it is possible to smoothly climb over the step without retreating.

Also, after climbing over the step, FIG.
As shown in (5), the check function of the check valve 8a is released by the operation piece 8b, and the operation lever 4 is returned in the reverse direction.
This operation is smoothly performed by the reaction force of the hydraulic pressure of the hydraulic cylinder 8.

As described above, in addition to the illustrated embodiment, it is also possible to adopt a configuration in which the carriage unit A is provided with a traveling drive unit.

Further, a booster that responds to air pressure and gas pressure can be selected.

[0034]

As described above, the bogie according to the present invention includes:
Since the operating force of the operating lever is amplified by the booster and transmitted to the auxiliary wheels, there is an effect that the supporting height of the auxiliary wheels is reliably changed against the load.

According to a second aspect of the present invention, since the booster is configured with a simple fluid pressure responsive structure, there is an effect that the booster can be easily manufactured at low cost.

According to a third aspect of the present invention, since the original operating force can be obtained from the operating lever formed in the form of a foot pedal, the supporting height of the auxiliary wheels can be more reliably changed against the load. There is.

Further, since the traveling assist device for a trolley according to the present invention is mounted on the luggage mounting table using the mounting bracket, there is an effect that the trolley can be easily mounted on the trolley.

In addition, since it is attached to the lower surface of the luggage mounting table, there is an effect that the equipment is not obstructed by other parts of the carriage.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a bogie and a bogie traveling assist device according to the present invention, wherein (A) shows a normal traveling state and (B) shows a state over a step.

FIG. 2 is a simplified configuration diagram of a main part of FIG. 1,
(A) shows a state in which the supporting height of the auxiliary wheel is increased,
(B) shows a state in which the supporting height of the auxiliary wheels is lowered.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an enlarged sectional view of another main part of FIG. 1;

FIG. 5 is a non-equipped state diagram of each part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Luggage mounting stand 3 Running wheel 4 Operation lever 6 Rod (booster) 7 Hydraulic pump (booster) 8 Hydraulic cylinder (booster) 9 Auxiliary wheel 10 Mounting bracket

Claims (4)

[Claims] 1. A truck in which a traveling wheel and an auxiliary wheel are supported on a lower surface of a luggage mounting table and a supporting height of the auxiliary wheel on the luggage mounting table is changed by an operation lever. A bogie characterized by connecting a booster to amplify the operating force. 2. The bogie according to claim 1, wherein the booster comprises:
From a rod connected to the operating lever, a fluid pressure pump connected to the rod and built-in fluid is pressurized by the rod, and a fluid pressure cylinder connected to the auxiliary pressure wheel connected to the fluid pressure pump and responsive to fluid pressure A bogie characterized by becoming. 3. The truck according to claim 1, wherein the operation lever is supported by a rear portion of the luggage carrier and is formed in the shape of a foot pedal. 4. A traveling assisting and running device for a truck, wherein the operating lever, the auxiliary wheel, and the booster provided on the truck of any one of claims 1 to 3 can be mounted on a lower surface of the luggage mounting table by a mounting bracket. .