JPH057898Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a handcart (cart) that can not only travel on flat ground but also be able to go up and down while supported on an escalator.

[Conventional technology]

Conventionally, a front wheel consisting of a caster is installed at the front of a car body that has a hand handle, and a rear wheel is installed at the rear of the car body, and the lower surface of the car body is supported by multiple step corners of an escalator, and the car moves up and down as the escalator goes up and down. A handcart that made this possible is known.

[The problem that the idea aims to solve]

There is no problem in transporting the above-mentioned hand truck on flat ground, but when the vehicle is placed on an escalator and descends with the front wheels suspended in the air, the casters of the front wheels may be damaged. The horizontal rotation support part rotates under its own weight, causing the wheels to move eccentrically to the front. In this state, when the vehicle moves forward by touching the comb at the descending end of the escalator, the front wheels change eccentricity from the state in which the vehicle is moving backwards to the forward state. Since it rotates, it becomes unstable at the beginning when moving forward.

At both ends of the escalator, the upper surface of the step enters the comb part and circulates through the back side, so when the vehicle body is lowered from the escalator, the resistance increases when the front or rear wheels ride up from the step onto the comb part. It will not be possible to unload it smoothly.

There was an inconvenience.

The present invention has been made to solve the above-mentioned disadvantages, and an object of the present invention is to provide a handcart that can be stably moved up and down on an escalator as well as when traveling on flat ground.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following features. The rotation support section allows the front wheels to rotate freely in the horizontal direction when moving the transport vehicle with the wheels in contact with the ground, and allows the front wheels to rotate in the horizontal direction due to their own weight when descending on an escalator without touching the front wheels. (2) A rake that is located on the front side of the front wheels and the rear wheels in the direction in which the vehicle moves, and contacts the escalator comb before the front and rear wheels when the transport vehicle is taken down the escalator. Each of them is characterized by the provision of a roller.

[Effect]

With the above configuration, the present invention has the following advantages: First, even when the transport vehicle descends on the escalator, the front wheels are kept in a forward running state, and the first forward run when moving from the escalator to a flat area is performed stably. .

Next, when the carrier vehicle is taken down from the escalator, the scooping roller comes into contact with the comb part before the front wheels or the rear wheels come into contact with the comb part, so that the vehicle body can be taken down smoothly from the escalator, and does not cause trouble to those following.

〔Example〕

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

In FIGS. 1 to 3, reference numeral 1 denotes the body of a hand truck. Handle columns 2 are erected on both sides of the rear of the body 1, and a hand handle 3 is provided between the upper ends of the columns 2, 2. is provided.
A single front wheel 4 made of a caster is provided at the center of the front of the vehicle body 1, and a pair of left and right rear wheels 5, 5 are provided at both rear sides of the vehicle body 1. Also, car body 1
is formed in a tapered shape where the front side is narrow and the rear side is wide when viewed from above, and multiple transport vehicles can be piled up front and back from the space between the handle supports 2 and 2 toward the front of the vehicle body, reducing the parking space. I'm starting to be able to do it. The front frame 6 of the vehicle body is rotated and folded as shown by the imaginary line in FIG. 1 when the vehicle bodies are in the stored state with the vehicle bodies stacked together, and when the vehicle bodies are not stacked, that is,
When in use, it stands up as shown by the solid line.

The hand handle 3 also serves as a brake operating lever, and when nothing is in contact with the handle 3, the brake is applied to the rear wheel 5. When the operator holds the handle 3 and rotates it downward or upward, When the brake is released, the vehicle body can be moved forward and backward freely, and when multiple vehicle bodies are stacked back and forth as described above, the handlebar 3 can be moved with the handle part of another vehicle body that is superimposed on the handlebar 3. The brakes are released by rotating the brakes so that only the brake at the rear end of the stack is applied.
Therefore, by putting a plurality of carrier vehicles in a stacked state and releasing the brake of the rearmost carrier vehicle, all of the stacked carrier vehicles can be moved at the same time.

On both sides of the lower part of the vehicle body between the front wheels 4 and the rear wheels 5, as shown in FIG. A support portion 8 is provided. This support part 8 is made of a cushioning material such as rubber, and has continuous unevenness so that it can easily engage with the corner of the step. In FIG. 1, the unevenness has the same shape, the same pitch, and the same plane. (lower surface), but it may be partially irregularly shaped, unevenly pitched, or unevenly flat (lower surface). Also, the parts of the vehicle body to be placed on the escalator 7 are not limited to the support section 8, but the front of the vehicle body. It can be anywhere from the lower part to the rear. Further, the support part 8 is connected to the escalator 7
When moving up and down while being supported by the corner of the steps of the escalator, the front wheels 4 and the vehicle body in front of them, and the rear wheels 5 and the vehicle body behind them are suspended in the air without contacting the steps of the escalator 7. .

As shown in FIGS. 4 and 5, the front wheel 4 has a rotating abutting portion having a rectangular planar shape, rounded corners, and a constant thickness on the horizontal rotating support portion 4a of the caster. 4b is provided, and when the horizontal rotation support part 4a and the rotation abutment part 4b rotate around the rotation center ○, the wheel 4c rotates eccentrically and functions as a free wheel. Rotation regulating members 9 are provided on both left and right sides of the rotation abutting portion 4b.

This rotation regulating member 9 moves one end of the left and right pair of swing arms 9a, 9a to the vehicle body at an interval slightly larger than the rotation radius when the rotation abutting portion 4b rotates about the center ○. are pivotally supported via shafts 9b, 9b, and the swinging arms 9a, 9a are normally held in a state narrower than the spacing between the shafts 9b, 9b, at the other ends of the swinging arms 9a, 9a. A spring 9c is tensioned so that it expands when an external force is applied to the spring 9a. In the middle of the swinging arms 9a, 9a,
The roller 9 faces the side surface of the rotating contact portion 4b.
d and 9d are provided, and when the rotary contact portion 4b rotates significantly, they come into contact and swing the swinging arms 9a, 9a against the elastic force of the spring 9c, thereby increasing the distance between them. ing.

The rotation regulating member 9 controls the front wheels 4,
When the rear wheels 5 are in contact with the ground, that is, when moving on flat ground, the elastic force of the springs 9c is set so that the front wheels 4 can fully function as casters, allowing free horizontal rotation, and transporting the vehicle. When the car is placed on the escalator 7 and descends, the weight of the front wheels 4 causes the car body 4c to eccentrically rotate forward, causing the rotary contact portion 4b to contact the roller 9d and push the swing arms 9a, 9a apart. However, the elastic force of the spring 9c prevents this and prevents the front wheel 4 from rotating horizontally.

Scoop rollers 10 are provided on the vehicle body in front of the front wheels 4 and rear wheels 5, respectively. As shown in FIG. 6, this scooping roller 10 comes into contact with the comb portion 7a of the escalator before the front wheels 4 and rear wheels 5 when the transport vehicle is placed on the escalator 7 and taken down from the escalator 7 at the end of its ascending and descending. , which functions to move the transport vehicle smoothly from the escalator to flat ground.

In a hand truck with such a configuration, when driving on flat land with cargo loaded on the truck,
The operator can move the transport vehicle by holding the hand handle 3 and pushing it with the top turned slightly downward. When changing direction or moving the vehicle backwards, the front wheels 4
A large horizontal rotational force is applied to the rotary contact portion 4b, which causes the rotary contact portion 4b to rotate around the center ○.
Its side surface contacts the roller 9d of the rotation regulating member 9 and pushes the swinging arms 9a, 9a apart against the elastic force of the spring 9c, thereby performing the same operation as a normal caster.

When placing the transport vehicle on the escalator 7 and going up and down, as shown in Fig. 7, with the handle 3 facing backwards, first roll the front wheels 4 into contact with the steps and place the vehicle on the escalator, so that the front wheels 4 touch the corners of the steps. After passing the step corner, the step corner on the front wheel 4 side is supported by the escalator support part 8, and at the same time, the support part 8 on the front side of the rear wheel 5 also moves up and down while being supported by the other step corner.

When the escalator and the transport vehicle descend, the front wheels 4 try to rotate 180 degrees horizontally around the horizontal rotation support part 4a due to their own weight, but when the rotation contact part 4b contacts the roller 9d. , the swinging arms 9a, 9a do not expand due to the elastic force of the springs 9c, and the front wheels 4 are held in the state in which the transport vehicle moves forward. Therefore, when the transport vehicle is pushed out from the descending end of the escalator, the front wheels 4 are maintained in the forward state, so that the transport vehicle can be moved forward smoothly and stably moved onto a flat ground.

When the transport vehicle is lowered from the ascending/descending end of the escalator 7, as shown in FIG.
comes into contact with the comb portion 7a, so the front wheel 4 or the rear wheel 5
The resistance of the comb part 7a to run on the comb part 7a is reduced, and
The straightness of the front wheels 4 and rear wheels 5 is improved, and the transport vehicle can be lowered from the escalator 7 smoothly and stably.

In the above embodiment, the front wheel 4 is one wheel, but even if the front wheel 4 is a plurality of wheels, the same effect can be achieved by providing a rotation regulating member 9 for each wheel.

[Effect of idea]

As explained above, according to the handcart of the present invention, the following effects can be achieved.

The entire lower part of the vehicle body, from the front to the rear, can be placed on the escalator, making it easy to operate, and a restriction member is provided to prevent the front wheels, which are made of casters, from rotating horizontally under their own weight. Therefore, when the transport vehicle travels on flat ground, the front wheels operate in the same way as normal casters, allowing transport work with good turning performance. Furthermore, when the transport vehicle is placed on an escalator and descends, the horizontal rotation of the front wheels due to its own weight is prevented by the regulating member.
When the transport vehicle moves from the escalator to a flat area, it can stably travel straight ahead, so that it can be safely and smoothly taken down from the escalator.

Since scoop rollers are provided in front of the front and rear wheels, when the transport vehicle is lowered from the ascending/lowering end of the escalator, the scoop rollers first come into contact with the comb section of the escalator, reducing the resistance of the front and rear wheels from running onto the comb section. The vehicle can be lowered easily and smoothly from the escalator. Further, since the scoop roller contacts the comb portion of the escalator, the straightness of the transport vehicle is improved, and the transport vehicle can be lowered stably.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the entire handcart, FIG. 2 is a plan view of the same, and FIG.
Figure 4 is a rear view of the same, Figure 4 is a perspective view of the front wheel and rotation restriction member, Figure 5 is a bottom view of the rotation restriction member, and Figure 6 is a perspective view of the front wheel and rotation restriction member.
The figure is an explanatory diagram of the operation of the rear wheel and rake roller.
The figure is a side view of a transport vehicle placed on an escalator and moved up and down. DESCRIPTION OF SYMBOLS 1...Vehicle body, 2...Handle pillar, 3...Push handle, 4...Front wheel, 4a...Horizontal rotation support part, 4b...Rotation contact part, 5...Rear wheel, 6...Front Frame, 7... Escalator, 7a... Comb part, 8...
Escalator support part, 9... Rotation regulating member, 9a
...Swinging arm, 9b...Axis, 9c...Spring, 9
d...Roller, 10...Scooping roller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A front wheel made of casters is installed at the front of a vehicle body having a hand-held handle, a rear wheel is installed at the rear of the vehicle body, and the lower surface of the vehicle body is supported at the corners of multiple steps of an escalator. In the hand truck, which can be raised and lowered as the escalator goes up and down, an uneven support part formed at the lower part of the vehicle body extending from the front to the rear part is supported by the plurality of step corners of the escalator, and the front wheel When moving the transport vehicle with its wheels on the ground, the front wheels can be rotated freely in the horizontal direction, and when descending on an escalator without touching the front wheels, the horizontal rotation support part of the A handcart characterized by being provided with a rotation regulating member that prevents rotation. (2) A scooping roller is provided which is located in front of the front wheels and the rear wheels in the direction in which the vehicle moves, and comes into contact with the escalator comb before the front wheels and the rear wheels when lowering the transport vehicle from the escalator. 1) Hand truck as described.