JPH057104Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a trolley that supports heavy objects such as trailers, and the wheels are brought out when moving, and the wheels are retracted when supporting heavy objects. This relates to a wheel entry/exit structure.

(Prior Art) Conventionally, as a structure for moving wheels in and out of a bogie that supports heavy objects, a wheel support plate with wheels provided on the underside is rotatably attached to both sides of the lower frame of the bogie. It is known that the wheel is moved in and out by the rotation of the wheel.

This will be explained based on FIG.

The truck 30 is formed entirely into a triangular pyramid shape in order to support a trailer (not shown), has a jack 30a disposed on its upper part, and has a lower frame 31 formed in a rectangular shape. One side of wheel support plates 34 and 35 having wheels provided on the lower surface is fixed to each of the opposing edges 32 and 33 of the lower frame 31, and an operating rod 36 is attached to the upper surface of the wheel support plate 34. There is. On the other hand, the wheel support plate 35
A metal abutment member 37 having a circular cross section is disposed on the upper surface of the control rod 3 that abuts on this abutment member 37.
A protective tube 38 is placed over the portion 6. When the wheels are brought out below the lower frame, the operating rod 36 is pressed against the contact member 37 to rotate the wheel support plates 34, 35 downward.

Note that when the operating rod 36 is pressed against the abutting member 37, the lower surface of the operating rod 36 and the abutting member 37 rub against each other.

Further, a hook-shaped fixing member 38 is provided on the other wheel support plate 35, and when the wheel is extended,
That is, the operating rod 36 is locked to the fixing member 39 with the wheel support plates 34 and 35 held horizontally.

In addition, by attaching the operating rod 36 so that it can rotate horizontally on the wheel support plate, the work of locking it to the fixing member 39 becomes easier.

During this horizontal rotation, the lower surface of the operating rod 36
It will rub against the contact member 37.

(Problem to be solved by the invention) However, in the conventional wheel loading and unloading structure, when the wheel protrusion is increased, the wheel support plate has a large inclination when the wheel is stored.
The angular difference between the wheel support plates increases, and when lowering the wheel, the operating rod must be pushed down with great force, and the frictional force between the operating rod and the contact member increases, further increasing the wheel's protrusion. There is a problem that it becomes difficult to insert.

Furthermore, since the operating rod and the contact member rub back and forth and from side to side, scratches and scrapes are likely to occur relatively early, making operation even more difficult.

The basic purpose of this invention is to solve the above-mentioned problems, and to provide a wheel loading/unloading structure that allows easy wheel loading/unloading and is excellent in durability.

(Means for Solving the Problems) In order to achieve the above object, in this invention, one side of each wheel support plate is attached to the opposing lower frames of the heavy object support truck so as to be rotatable up and down, and On the wheel support plate of the wheel support plate, an operating lever is attached that extends inward and partially contacts the upper surface of the other wheel support plate, and a rotatable ball is interposed on the contact surface of the operating lever. and further, for the operating lever,
A fixing means for holding the wheel support plate in a depressed state is provided, and the other wheel support plate facing the rotatable ball has a bent portion with a tip end inclined downward. It is something.

Note that the operating rod can be horizontally rotatably mounted on one wheel support plate, and a hook-shaped fixing member can be provided on the other wheel support plate.

(Function) According to this invention, the operating rod and the other wheel support plate contact and move with extremely low friction because the ball is in rolling contact therebetween. Therefore, even when the wheels are extended, the operation will not become difficult due to an increase in frictional force, and the wheels can be moved in and out with a small amount of force. Additionally, scratches are less likely to form between the operating rod and the wheel support plate, resulting in improved durability. In addition, since a bent portion is provided at the tip of the other wheel support plate that faces the ball, the ball can always be in contact with the other wheel support plate and the operating rod itself can be prevented from sliding against it. .

(Example) An example of this invention will be described below based on FIGS. 1 to 3.

A rectangular frame-shaped lower frame 1 is arranged below a trailer support truck equipped with jacks (not shown) on the upper part so as to support a trailer. A wheel support plate 2 made of a small rectangular flat plate is pivoted on one side, and a wheel 2a is attached to the lower surface of the wheel support plate 2. Further, an inwardly extending operating rod 4 is rotatably fixed on the upper surface of the wheel support plate 2 so as to be rotatable along the upper surface of the wheel support plate 2 . A ball caster 5 in which a ball 5a is rotatably disposed is provided on the lower surface of the central portion of the operating rod 4 at a portion that comes into contact with the other wheel support plate, which will be described later. Further, a flat foot plate 6 is attached to the tip of the operating rod 4.

On the other hand, inside the other end edge 1b of the frame 1,
One side of the approximately triangular wheel support plate 7 is fixed to a shaft so that it can rotate up and down, and the wheels 7a,
7a is provided. A bent portion 8 bent downward is provided at the other end of the wheel support plate 7 . A frame member 9 is provided on the top surface of the tip of the bent portion 8, and the operating rod 4 is inserted through the frame member 9. Further, on the upper surface of the wheel support plate 7 on the axle side, a hook-shaped fixing member 1 that engages with the operating rod 4 is provided.
0 is set.

To explain the operation of this embodiment, when the wheel is brought out downward from the lower frame 1, the operating rod 4 is pushed down with the hand or foot using the foot treadle 6, and the ball 5a on the lower surface and the upper surface of the wheel support plate 7 are pressed down. The wheel support plate 2 and the wheel support plate 7 are rotated downward while they are in contact with each other. In this rotation, the ball 5a and the upper surface of the wheel support plate 7 roll into contact, and the wheel support plate 2 and the wheel support plate 7 rotate downward with little friction.

Note that at the beginning of rotation, the ball 5a rolls into contact with the bent portion 8 on the wheel support plate 7, so even if the angular difference between the wheel support plate 2 and the wheel support plate 7 is large, the operation cannot be performed. The rod 4 does not directly contact the bent portion 8, and only the ball 5a is in contact with the bent portion 8, so rolling contact is not inhibited and the operating rod 4 is not damaged by the edge of the bent portion 8. This can also be avoided. Also, the wheel support plate 7
If the bending part 8 is not provided in the bending part 8, the action of the operating rod 4 will be transmitted quickly, and the wheels 7a will protrude below the frame before the wheels 2a, which will impair the operability of the truck. By providing this, the movement of wheels 7a and 2a is coordinated,
Operability can be improved.

As the rotation progresses further and the wheel support plate 2 and wheel support plate 7 become horizontal, the operating rod 4 is rotated along the upper surface of the wheel support plate 7, and the fixing member 10
the hook 10a. As a result, the wheel support plate 2 and the wheel support plate 7 are fixed and prevented from rotating upward, and the wheels are maintained in a protruding state, so that the cart can be moved by the wheels.

Next, a case where the wheels are housed in the lower frame 1 will be described.

The operating rod 4 engaged with the fixed member 10 is rotated along the upper surface of the wheel support plate 7, and the hook portion 10a is rotated.
disengage with.

During the rotation of the operating rod 4, the operating rod 4 and the wheel support plate 7 are in contact with each other at the balls 5a, and the operating rod 4 can rotate smoothly.

Next, the operating rod 4 is rotated upward together with the wheel support plate 7. Due to this rotation, the operating rod 4 comes into contact with the frame member 9 of the wheel support plate 7, and together with the upward rotational force exerted on the wheel support plate due to the weight of the truck, the wheel support plate 7 is pulled upward and rotated. . In this way, the wheel support plate 2 and the wheel support plate 7 rotate upward, and the wheels are housed within the frame of the truck.

In the above embodiment, the fixing member is provided on the upper surface of the other wheel support plate 7, but it can also be provided on the frame, and the means for fixing it to the operating rod can be changed as appropriate. In short, any device that can be fixed so as to prevent rotation of the operating rod with the wheels extended will suffice.

(Effects of the invention) As explained above, according to this invention, wheel support plates are provided on both sides of the lower part of the bogie body, each of which has a wheel attached to its lower surface and whose outer end is rotatably pivoted up and down. An inwardly extending operating rod is attached to the upper surface of one wheel support plate, and a freely rotatable ball is disposed on the lower surface of the operation rod and the contact surface with the other wheel support plate, The other wheel support plate is provided with a locking part that locks with the operating rod, so the operating rod and the other wheel support plate contact with extremely little friction, making operation easier and preventing slippage. This has the effect of reducing the occurrence of scratches and improving durability. In particular, the tip of the other wheel support plate that faces the rotatable ball is bent downward, so that the ball always comes into contact with the other wheel support plate and does not make sliding contact with the operating rod. This has the effect of avoiding this, improving operability at the initial stage of operation, and improving durability.
By coordinating the movement of the retracting wheels, it has the effect of improving operability as a trolley.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of this invention, FIG. 2 is a front view, FIG. 3 is an enlarged side view showing a fixing member, and FIG. 4 is a front view showing a conventional example. 1... Lower frame, 2, 7... Wheel support plate,
4... Operating rod, 5a... Ball, 10... Fixing member.

Claims (1)

[Scope of claims for utility model registration] 1. On the opposing lower frames of the heavy object support truck,
One side of each wheel support plate is attached to be rotatable up and down, and on one wheel support plate is attached an operating rod that extends inward and partially contacts the top surface of the other wheel support plate. On the contact surface of the operating rod,
A rotatable ball is interposed, and furthermore,
A fixing means is provided for fixing the operating rod in a state where the wheel support plate is pushed down, and the other wheel support plate facing the rotatable ball has a bent end portion inclined downward. A wheel loading/unloading structure for a heavy object support truck, characterized in that the wheel loading/unloading structure is provided as a part. 2. A heavy object support truck characterized in that the operating rod is horizontally rotatably mounted on one wheel support plate, and a hook-shaped fixing member is provided on the other wheel support plate. Wheel entry and exit structure.