JP2002240752A - Structure of crawler for handcart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize excellent travelability of a crawler-type travel device for a handcart, a wheel chair, etc., by solving problems of the crawler-type travel device such as a complex structure, heavy weight and high rotation resistance thereof. SOLUTION: This structure of a crawler belt is composed of a flexible belt, rollers and closely arranged shoes so that its weight and rotation resistance can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type traveling device, and more particularly, to a structure of a crawler belt for a cart.

[0002]

2. Description of the Related Art The crawler type has been conventionally used for agricultural and construction vehicles and has excellent running performance, but it is well known that the structure is more complicated and the rotation resistance is larger than that of the wheel type. There have been various attempts to develop light-weight tools for transporting people and goods using human power and auxiliary small power, but they have not yet become widespread.

[0003]

One of the reasons why the rotational resistance is so large is that the crawler belt is tensioned. That is, the belt is pushed up at the convex portion of the road surface together with the deflection due to its own weight. When the belt is loosened so that it fits into the unevenness of the road surface, the resistance of the rolling wheel that rolls on it increases, and when the belt is too tight, In addition to worsening the follow-up performance, the rotational resistance of the belt itself also increases.Therefore, in general, a tensioner is provided to maintain the tension of the belt properly. Aside from industrial vehicles with sufficient power, this is a problem for hand-held vehicles. Lever can be effective in small and light trucks because rotational resistance is also reduced by a large margin. The present invention provides a moving device that utilizes the traveling performance of a crawler and has a simple mechanism, which can be used in a hand cart or a wheelchair for nursing care, so that the range of use can be simplified and expanded. The purpose is to do.

[0004]

SUMMARY OF THE INVENTION In view of the above objects, the present invention provides a guide wheel on a lower surface having a guide rail for rolling wheels, a guide wheel attached to both ends of a frame which is long in the moving direction, and a crawler belt attached to the guide wheel. In the crawler device configured so as to extend, the rolling wheels are arranged on the inner peripheral surface of the belt, and the shoes are densely arranged and mounted on the outer peripheral surface, and the contact surface is configured to be slidable.

[0005] With the above-described structure, even if a convex portion or a nose portion of the road surface hits between the rolling wheels, the shoes in contact with the honey press against each other, and the force for pulling the belt works. No, if the belt is twisted due to the condition of the road surface, the shoes will slide together and respond flexibly.In both cases, no tension is generated on the crawler belt due to unevenness on the moving road surface, and the shoe is a belt passing through the guide wheel The crawler belt can move smoothly because it is installed without any trouble in the bend.

[0006]

Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a guide wheel 4 is attached to both ends of a frame 3 and a guide rail 7 having a sectional shape shown in FIG. 2 is provided on the lower surface. As shown, the shaft of the rolling wheel 5 is attached to the inner surface of the belt 2, and the shoes 6 are closely arranged on the outer surface, and are attached with screws (not shown) as shown in the figure. In addition, the tread surface of the elastic material 8 has a chamfer to prevent foreign substances from being caught or corners being damaged,
In addition to engraving the pattern to reduce the resistance at the time of turning and various road conditions, it is also possible to form the shoe 6 from a material having an appropriate elasticity and integrate it.

[0007]

Since the present invention is configured as described above, the following effects can be obtained.

[0008] Even if a bump on the road surface or a nose portion of a step hits the crawler belt, the portion will not be dented, and the pulling force of the belt will not work. In order to respond flexibly, the movement is light, and the entire structure such as the guide wheels can be manufactured easily and lightly.

[0009] By shaping the guide rail so that the ground contact portion of the crawler belt is slightly warped, an effect like a wheel having a very large diameter is produced. A smooth ride can be obtained even on paved roads, eliminating the risk of punctures like pneumatic tires.

When used in a wheelchair for nursing care or the like which can be disassembled and carried because it can be manufactured lightweight, there is no part having an area like a wheel, so that it is easy to carry.

[0011]

[Brief description of the drawings]

FIG. 1 is a schematic side view of a crawler device.

FIG. 2 is a partial sectional view showing a relationship between a frame and a crawler belt.

FIG. 3 is a perspective view illustrating an embodiment of a configuration of a crawler belt.

FIG. 4 is an explanatory view showing the degree of twist between shoes in cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crawler belt 2 Belt 3 Frame 4 Guide wheel 5 Roller wheel 6 Shoe 7 Guide rail 8 Elastic material

Claims (1)

[Claims] A guide rail (7) for rolling wheels running on a lower surface.
A guide wheel (4) is attached to both ends of a frame (3) which is long in the moving direction and has a crawler belt (1).
In the crawler device constructed by rolling over, a rolling wheel (5) is arranged on the inner peripheral surface of the belt (2), and shoes (6) are densely arranged and attached on the outer peripheral surface, and the contact surface thereof is slidable. A structure of a crawler for a hand-carrying vehicle, comprising: