JP2002178927A - Carriage equipped with falling down preventing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carriage capable of stably conveying an object even if the object has a high center of gravity and a small bottom area. SOLUTION: This carriage 1 having a rectangular platform 2 with a caster is provided with the falling down preventing mechanism 11 for preventing falling down of the carriage to a short side direction of the platform. The falling down preventing mechanism is provided with a pair of rod-shaped members 12 and 13 protrudable to both sides from the platform along the short side direction. The caster is disposed respectively on a tip part of the pair of the rod shaped members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley provided with a mechanism for preventing the trolley from falling, and more particularly to a stable transport of a trolley having a rectangular platform with casters.

[0002]

2. Description of the Related Art Conventionally, a push-type trolley having a rectangular platform has been known. Casters are provided at the four corners of the platform, and the object placed on the platform is conveyed by gripping and pushing or pulling a handle provided on the platform.

[0003]

However, in the conventional truck as described above, if an object having a high center of gravity and a small bottom area is to be conveyed, the placed object is short of the platform together with the truck. There is an inconvenience that it is easy to fall down in the side direction and eventually to damage the object.

[0004] The present invention has been made in view of the above-mentioned problems, and has as its object to provide a bogie that can stably convey an object having a high center of gravity and a small bottom area. .

[0005]

In order to solve the above-mentioned problems, according to the present invention, in a bogie having a rectangular platform with casters, a fall prevention mechanism for preventing the platform from falling in a short side direction. A trolley characterized by comprising:

According to a preferred aspect of the present invention, the fall prevention mechanism has a pair of bar-shaped members that can protrude from the platform along both short sides thereof on both sides. In this case, it is preferable that casters are provided at the tip portions of the pair of rod-shaped members, respectively.

In this case, in a state where the casters protrude from the platform, the lower ends of the casters provided at the tips of the pair of rod members are slightly smaller than the lower ends of the casters provided at the four corners of the platform. Is preferably set to be located above.

Further, according to a preferred aspect of the present invention, there is provided a pair of connecting members, one ends of which are pivotally connected to the distal ends of the pair of rod-shaped members, and the other ends of the pair of connecting members are pivotally connected to each other. ing.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is provided with a mechanism for preventing the platform from falling in the short side direction. Specifically, the fall prevention mechanism has, for example, a pair of bar-shaped members that can project from the platform to both sides along the short side direction thereof.

Therefore, in the truck of the present invention, even if an object having a high center of gravity and a small bottom area is placed,
By the action of the pair of rod-shaped members protruding from the platform, it is possible to reliably prevent the placed object from falling down in the short side direction of the platform together with the carriage, and as a result, the object placed on the platform can be stably held. Can be transported.

An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing an entire configuration of a truck provided with a fall prevention mechanism according to an embodiment of the present invention. FIG. 2 is a view for explaining the configuration and operation of the fall prevention mechanism in the bogie of FIG.

Referring to FIG. 1, a truck 1 according to the present embodiment is shown.
Is provided with a rectangular platform 2 for placing an object to be transported. In addition, casters are provided at the four corners on the lower side of the platform 2, but are not shown for clarity of the drawing. On the platform 2, a U-shaped handle 3 is provided upright.

Further, the carriage 1 of the present embodiment includes a fall prevention mechanism 11 for preventing the platform 2 from falling in the short side direction. Referring to FIGS. 1 and 2,
The fall prevention mechanism 11 has a pair of bar-shaped members 12 and 13 that can protrude from the platform 2 to both sides along the short side direction. Casters 12b and 1 are attached to tip portions 12a and 13a of a pair of rod members 12 and 13, respectively.
3b (not shown in FIG. 1) are provided.

Here, in the state of being protruded from the platform 2, the lower ends of the casters 12b and 13b provided at the tips 12a and 13a of the pair of rod members 12 and 13 are connected to the casters provided at the four corners of the platform 2. (Not shown) so as to be located slightly above the lower end.

Further, a pair of connecting members 14 are attached to the tip portions 12a and 13a of the pair of bar members 12 and 13.
And 15 are pivotally connected at one end (pinned in the plane of FIG. 2). The other ends of the pair of connecting members 14 and 15 are pivotally connected to each other.

More specifically, the pair of connecting members 14 and 15 are set to extend linearly on the platform 2 in a state where the pair of bar members 12 and 13 project horizontally from the platform 2. (See FIG. 2 (c)). Therefore, the pair of rod members 12
In a state where most of and 13 are accommodated under the platform 2, a pair of connecting members 14 and 15 are provided.
Are configured to form an isosceles triangle on the platform 2 (see FIG. 2A).

Therefore, in this embodiment, FIG.
As shown in the figure, when the cart 1 is not in use, most of the pair of rod members 12 and 13, that is, the tip 1
Parts other than 2a and 13a are accommodated under the platform 2. When using the cart 1, FIG.
(B) and (c), as shown in FIG.
The joint (the vertex of the isosceles triangle) of the pair of connecting members 14 and 15 is pushed down until the and 15 extend linearly on the platform 2.

Then, the object to be conveyed is placed on the platform 2. At this time, Platform 2
It is preferable to provide a pair of pedestals 4a and 4b on the platform 2 so that the pair of connecting members 14 and 15 extending linearly does not hinder stable placement of the object. In this case, it goes without saying that the height position of the upper surfaces of the pedestals 4a and 4b is set slightly higher than the height position of the upper surfaces of the pair of connecting members 14 and 15 extending linearly on the platform 2. Nor.

When the carriage 1 is used exclusively for transporting an object having a predetermined size, bar-like holding guides (not shown) are provided upright at the four corners above the platform 2. Is preferred. In this case, the object can be stably held on the platform 2 by the operation of the four holding guides. Thus, the carrier
The object placed on the platform 2 can be conveyed by gripping the handle 3 and pushing or pulling the cart 1.

The base ends of the pair of rod members 12 and 13 (ends opposite to the end portions 12a and 13a).
It is preferable to provide a stopper for preventing the pair of bar-shaped members 12 and 13 from projecting from the platform 2 for a predetermined distance or more. With this configuration, when the pair of connecting members 14 and 15 extend linearly on the platform 2 as shown in FIG. 2C, the pair of bar members 12 and 13 move freely with respect to the platform 2. Can be prevented.

In the present embodiment, when the pair of connecting members 14 and 15 extend linearly on the platform 2 as shown in FIG.
Even if a force toward the center acts on the distal end portions 12a and 13a of the actuators 13 and 13, there is no danger of easily falling down as shown in FIG. Hereinafter, this point will be briefly described with reference to FIG.

As shown in FIG. 3, when the pair of connecting members 14 and 15 extend linearly on the platform 2, the distal end portion 12a of the rod member 12 and the connecting member 14 are connected to each other.
A pivot joint C with one end of the rod member 13 and a tip 13
The pivotal joint A between the “a” and one end of the connecting member 15 and the pivotal joint B between the other end of the connecting member 14 and the other end of the connecting member 15 do not line up at the same height. That is, a state in which the central pivot joint B contacts the platform 2 by the action of gravity is a stable state. In this stable state, the height position of the central pivot joint B is the pivot joints C and A at both ends. Lower than the height position. Therefore, as shown in FIG.
Even when a force toward the center (indicated by an arrow F in the figure) acts on the distal end portions 12a and 13a of the pair, the pair of connecting members 14 and 15 maintain a state of linearly extending on the platform 2, and FIG. There is no danger of falling easily as in (b).

As described above, in the present embodiment, as the fall prevention mechanism 11 for preventing the platform 2 from falling in the short side direction, a pair of protruding sides from the platform 2 along the short side direction can be used. The rod-shaped members 12 and 13 are provided. Therefore, even if an object with a small center area is placed at a position where the center of gravity is high, the
In addition, it is possible to reliably prevent the platform 2 from falling in the short side direction, and to stably transport the object.

In the above-described embodiment, the pair of rod members 12 and 13 and the pair of connecting members for driving the pair of rod members 12 and 13 constitute a falling prevention mechanism. Without being limited, various modifications are possible as the fall prevention mechanism.

[0025]

As described above, according to the present invention, as a fall prevention mechanism for preventing the platform from falling in the short side direction, for example, a pair of platforms that can project from the platform to both sides along the short side direction. It has a rod-shaped member. Therefore, even if an object having a small center area is placed at a position where the center of gravity is high, it is possible to reliably prevent the object from falling down in the short side direction of the platform together with the bogie, and to stably transport the object. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an entire configuration of a truck provided with a fall prevention mechanism according to an embodiment of the present invention.

FIG. 2 is a view for explaining the configuration and operation of a fall prevention mechanism in the bogie of FIG. 1;

FIG. 3 is a diagram illustrating a risk that the pair of connecting members may easily fall down as shown in FIG. It is a figure explaining that it does not become a state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dolly 2 Platform 3 Handle 4 Pedestal 11 Fall prevention mechanism 12, 13 A pair of rod-shaped members 12b, 13b Casters 14, 15 A pair of connection members

Claims (5)

[Claims] 1. A trolley having a rectangular platform with casters, wherein the trolley is provided with a fall prevention mechanism for preventing the platform from falling in a short side direction. 2. The bogie according to claim 1, wherein the fall prevention mechanism has a pair of rod-shaped members protruding from both sides of the platform along a short side direction thereof. 3. The bogie according to claim 2, wherein casters are provided at tip portions of the pair of rod-shaped members, respectively. 4. A lower end portion of a caster provided at a tip portion of the pair of rod-shaped members is slightly higher than a lower end portion of a caster provided at four corners of the platform in a state of protruding from the platform. The trolley according to claim 3, wherein the trolley is set to be located. 5. The apparatus according to claim 1, further comprising a pair of connecting members each having one end pivotally connected to a tip end of said pair of rod-shaped members, and the other ends of said pair of connecting members being pivotally connected to each other. The cart according to any one of items 2 to 4.