JP2006103518A - Traveling truck with step climbing function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily climb over a step and the like from a roadway toward a sidewalk by a simple structure and operation, and to safely travel. <P>SOLUTION: To a front axle 5 of a truck frame 1, a wheel attaching arm 4 rotatably attached with a front main wheel 2 and a sub wheel 3 is attached so as to rotate only in a backward direction of the truck frame 1 and hold a caster angle. An auxiliary handle 10 is united to a rear axle 6 side, and a connecting rod 8 is pivotally united to a link arm 7 from a middle part of the auxiliary handle 10. A slider 9 coupling/fixing the front axle 5 and the rear axle 6 is installed. When abutting on a step, only by pushing the auxiliary handle 10, the truck easily climbs over safely the step by leverage and a link action. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention is a light vehicle having a front wheel and a rear wheel. When the wheel is brought into contact with the wall surface of the step with the step elimination technology, the step can be overcome with a light force by the lever boosting mechanism and the link mechanism. It is related with the technology of the light vehicle which has.

In the technology to eliminate the steps of traveling vehicles such as elderly vehicles, baby carriages, transport vehicles, etc., all wheels use relatively small-diameter wheels. Next, lift the handle frame and place the rear wheel. All the operators overcame the steps by moving the handle frame up and down with the power of their hands. In the baby carriage, the operator is a young mother, so there is a feeling that some steps are not taken care of. Especially in the case of an old lady, the whole body is weak and the strength of the hand is even weaker, so there is a difference of more than 10 cm in the level difference from the roadway to the sidewalk.

However, in the conventional proposal, the structure of the step-over device is complicated, the size of the device is large, the weight of the device is excessive, and the technical means of the simple structure is added to the small-diameter wheel. There aren't many effective ones. In recent years, slopes have been provided so as not to hinder the running of wheelchairs, etc., and dedicated lifting devices have been installed. The level difference between the roadway and the sidewalk, and the level difference at the entrance of the store are obstructing the traveling vehicle equipped with small diameter wheels. It is also an issue that the operator can operate with a light force.

The goal is to obtain technical means that can easily get over steps that are difficult to get on with only wheels, such as steps on a sidewalk, from relatively low steps without improving the body of the traveling vehicle. It is an object of the present invention to provide technical means that does not cause the center of gravity movement of a traveling vehicle that occurs in the future.

Therefore, the present invention employs the following configuration for the purpose of surely and efficiently reducing the burden on the frame and the wheels during step traveling, ensuring safety during step traveling, and the like.

That is, the traveling vehicle provided with the step traveling wheel of the present invention adds a step traveling wheel to a traveling vehicle such as a traveling vehicle for the elderly, a baby carriage, a transport cart, etc., and an auxiliary handle is provided on the rear side to connect the front wheel with the connecting rod. By connecting and pushing the auxiliary handle with the link mechanism, it is possible to easily get over the step.

A T-type tilting axle arm is fitted with a support wheel and a front main wheel is locked at the lower end, which is called a wheel mounting arm. An auxiliary handle is installed at the rear of the vehicle body, and the upper end of the wheel mounting arm and the auxiliary handle Join the articulated rod at half the length of the. In normal driving, when the wheel comes into contact with the step, it is possible to get over the step with a light pressing force by pushing the auxiliary handle to urge the wheel mounting arm to rotate through the connecting rod.

The carriage frame having the wheels of the present invention can pass through steps and obstacles with a small force.
The wheel mounting arm of the T-type tiltable axle is installed on the front axle so that it can rotate at a caster angle of 10 degrees. When the front main wheel comes into contact with the step, it falls backward. A circular arc is drawn in the center, and the caster angle is slightly 10 degrees, but the support wheel extends backward. In other words, it is challenging a step that is as high as the back stretch.

Since the wheel mounting arm is independently suspended, the present invention is excellent in stability because it reacts individually even when it is obliquely passed with respect to the step.

In the present invention, the lever booster mechanism of the auxiliary handle and the link arm of the wheel mounting arm are connected by a linkage mechanism by the link mechanism, so that when the wheel mounting arm contacts the step, the auxiliary handle is pushed. Therefore, the hand pressure is doubled and transmitted to the link arm of the wheel mounting arm via the connecting rod. The support wheel rides on the step and rolls, and the wheel mounting arm is urged to rotate, so the cart can easily get over the step without requiring great force, and the force from all wheels to the rear wheel Transmission is carried over by sliding on the upper surface of the step with a slider.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, reference numeral 1 denotes a bogie frame, 2 denotes a front main wheel pivoted to the lower end of the wheel mounting arm 4, and 3 denotes a support wheel having a small diameter with respect to the front main wheel 2. The relationship between the front main wheel 2 and the auxiliary wheel 3 is set such that when the front main wheel 2 contacts the step wall A, the auxiliary wheel 3 rides on the step upper surface A ′.
Reference numeral 4 denotes a wheel mounting arm that fixes the front main wheel 2 and the auxiliary wheel 3. The base of the arm can be rotated only backward on the front axle 5 of the carriage frame 1, and a rotation restricting portion 4 ′ is provided. . Reference numeral 6 denotes a rear axle, and a slider 9 connecting the front axle 5 and the rear axle 6 is installed in a bow shape. The wheel mounting arm 4 is provided with a rotation restricting portion 4 ′ which is held at a caster angle of 10 degrees and rotates only in the rear direction, and the pulling spring 11 holds the caster angle to maintain the normal posture. The wheel mounting arm 4 has a T shape, one end of which forms a link arm 7, 8 is a connecting rod, and is connected to the link arm 7, and the other end is the rear axle of the carriage frame 1. 6 is connected to a position half the length of the auxiliary handle 10, 10 'is a shaft portion to which the connecting rod 8 is connected, and 12 is an operation handle frame.

FIG. 2 is an enlarged detailed view of the wheel mounting arm 4. When the front main wheel 2 comes into contact with the stepped wall surface A, the wheel mounting arm 4 moves the rotation restricting portion 4 'forward, the center of gravity approaches the assisting wheel 3, and the assisting wheel 3 already on the upper surface A' of the stepped wall surface A is The front main wheel 2, which has come down to land and acts to get over the upper surface A ′ of the stepped wall surface A and the center of gravity has moved to reduce the burden, can easily get over the upper surface A ′ of the stepped wall surface A.

As shown in FIG. 3, when the auxiliary handle 10 is pushed and the pressure boosted by the lever is transmitted to the link arm 7 through the connecting rod 8, the center of gravity is placed on the assist wheel 3 of the wheel mounting arm 4 that has rotated. It moves and raises the front main wheel 2 at a stretch and pushes it up to the upper surface A ′ of the step wall A.

As shown in FIG. 4, the slider 9 slides on the upper surface A ′ of the step at the same time as the front wheel portion gets on, and the rear wheel is also driven as it is, so that it rides lightly. When all the wheels are on board, the traveling carriage suddenly loses resistance.

As shown in FIG. 5, the caster angle of the wheel mounting arm 4 of each part is restored by the action of the tension spring 11, and the auxiliary handle 8 is also restored to the original position.

As shown in FIG. 6, after returning to the normal shape on the step upper surface A ′, the vehicle is moved to the operation handle frame 12 and travels. Reference numeral 13 denotes a part of the operator's arm with a dotted line.

The normal state of the traveling carriage is shown. FIG. 5 is an enlarged detail view of the wheel mounting arm 4. The state which contact | abutted to the level | step difference wall surface A is shown. A state in which the slider 9 slides on the step upper surface A ′ is shown. FIG. 1 shows a state in which the entire carriage has climbed on the upper surface A ′ of the step and each part has returned to the origin as shown in FIG. The same normal state as shown in FIG. 1 is shown.

Claims (2)

A wheel mounting arm 4 having a front main wheel 2 and an auxiliary wheel 3 rotatably attached thereto is attached to the front axle 5 of the carriage frame 1 so as to be able to rotate only in the rear direction while maintaining a caster angle. Is a traveling carriage in which an auxiliary handle 10 is coupled, a connecting rod 8 is axially coupled to the link arm 7 from the middle of the auxiliary handle 10, and a slider 9 in which the front axle 5 and the rear axle 6 are connected and fixed is installed. The traveling carriage according to claim 1, wherein the operation handle frame (12) of the carriage frame (1) is omitted by extending the auxiliary handle (10).

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