JPH05246346A - Conveyor truck - Google Patents

Abstract

PURPOSE:To dispense with a moving space at the turning time with compact and simple constitution by providing a rod for connecting a set of wheels mounted to the right and left sides of the lower face of a truck so as to rotate the wheels in the same direction, and providing pistons for driving the rod to change the direction of the wheels. CONSTITUTION:Plural sets of forks 2 with traveling wheels 1 fitted thereto are rotatably journalled to the lower face of a truck frame 3, and arms 5 fixed to the forks 2 are mutually interlocked through rods 6. A double acting type two-stage expansion cylinder 11 is integrated between the truck frame 3 and the center arm 8 of an oscillating means for the arms 5, and two sets of pistons 11a, 11b are provided therein. With the expansion of one of the pistons 11a, 11b, the traveling wheels 1 perform the direction changing action in the longitudinal or lateral right-angled direction, and with the expansion of the other piston, the traveling wheels l perform the steering adjusting action in the respective longitudinal-lateral directions. These actions are performed independently by the double acting mechanism of one cylinder 11 so as to perform easy steering in an optional direction in the same position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carriage used for carrying heavy objects, long materials and the like.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional carrier truck used for carrying heavy goods, long materials and the like. In the figure, the carriage shown in FIG. 1 (a) is an example of the simple type that has been most widely used in the past, and is equipped with traveling wheels 1 that can be steered at an arbitrary angle on the front side or front and rear sides of the bottom surface of the bogie frame 3. Therefore, it is possible to drive the vehicle in a desired direction by moving it back and forth in a steered state.

Further, in the carrier vehicles shown in FIGS. 1B and 1C, the fulcrum shafts 13 serving as the turning centers of the traveling wheels 1 are provided.
The gear 14 is attached to the
Is engaged with the gear 15 provided at the center, and the gear 15 provided at the center is rotated to rotate the gear 14
Are rotated in synchronism, and all the traveling wheels 1 can be steered in the same direction.

[0004]

As described above, there are various types of conventional trolleys, but the one shown in FIG. 3 (a) is one in which the trolley is moved back and forth while being steered during turning. It requires a wide movement space to move the head to the right side, and it is difficult to make fine movement adjustments such as width adjustment. In addition, FIG.
Although the one shown in (c) can be steered to run in any direction, there is a problem that the manufacturing cost becomes high because the steering mechanism is large and complicated.

[0005]

A carrier truck according to the present invention is intended to solve the above-mentioned problems, and a rod for connecting a pair of wheels mounted on the left and right of the lower surface of the truck to rotate them in the same direction. And a piston that is engaged with the rod and drives the rod to change the direction of the wheel.

[0006]

That is, in the carrier truck according to the present invention, a pair of wheels mounted on the left and right of the lower surface of the truck and connected by rods and rotating in the same direction are driven by the pistons engaged with the rods. By changing the direction of the wheels with a small and simple steering mechanism, it is possible to run the truck in the left, right, side, and diagonal directions at the same position without moving it back and forth. it can.

[0007]

1 and 2 are explanatory views of a carrier truck according to an embodiment of the present invention. In the figure, the carrier according to the present embodiment is used for carrying heavy objects, long materials, etc., and has a simple structure and can be easily steered in the front-rear direction, the left-right direction, and the oblique direction. It is possible to drive the vehicle to drive it.

That is, at the four corners of the lower surface of the carrier, as shown in FIG.
As shown in (a) and (b), four sets of forks 2 having traveling wheels 1 attached to their lower ends are pivotally supported on a bogie frame 3 through pins 4 so as to be vertically rotatable, and rods 6 are respectively provided. It is equipped with an arm 5 for attachment. A rod 6 is connected between the arms 5 facing each other on the left and right, and a front and rear rods 6 are fixed to a central shaft 7 provided at the center of the bogie frame 3 so that a center arm 8 can be turned. And the front and rear rods 9 are connected to each other. A cylinder 11 that applies a steering force to the traveling wheels 1 is attached between one end of the center arm 8 and the bracket 10 that is fixed to the bogie frame 3. This cylinder 11 is generally referred to as a double-acting two-stage telescopic cylinder, and as shown in FIG. 2C, two sets of pistons 11a and 11b are incorporated in the body of the integrated cylinder 11. Pair of pistons 11a, 11b
Each is capable of expanding and contracting independently. Although not shown, the cylinder 11 is equipped with a hydraulic unit for operating and controlling this double-acting two-stage telescopic cylinder for steering, a control box, operation units such as an operation pendant, and the like. In the case of steering at right angles in the front-back and left-right directions, that is, in the vertical and horizontal directions, one of the double-acting two-stage telescopic cylinders 11, for example, the piston 11a.
The expansion and contraction of the other piston 11b is used for steering in each direction with respect to the front-back and left-right directions. FIG. 2 (a) shows a case in which the carriage is set so as to be able to travel in the front-rear direction. By contracting the piston 11a to the shortest position and steering diagonally, the expansion / contraction position of the piston 11b is adjusted. To do. Further, FIG. 2B shows a case where the carrier is set to be able to travel in the left-right (horizontal width) direction. The piston 11a is extended to the longest position, and steering is performed in the diagonal lateral direction with reference to this position. Is performed by appropriately adjusting the expansion / contraction position of the piston 11b.

As described above, in this carrier, a plurality of sets of forks 2 having traveling wheels 1 attached to the lower surface of the bogie frame 3 are rotatably supported, and an arm 5 fixed to the forks 2 is connected via a rod 6. Of the two pistons 11a and 11b by incorporating a double-acting two-stage telescopic cylinder 11 between the center arm 8 of the swinging means of the arm 5 and the bogie frame 3. By traveling wheel 1
Is operated to change the direction to the front-back or left-right direction, and the other side is extended or contracted to adjust the steering in the front-back or left-right directions. By performing the turning operation and the steering adjustment operation in the right-angle direction separately by the double-acting mechanism of one cylinder 11, the structure is simple, and the plane can be moved in any direction such as front, rear, left and right without turning the plane. It can be steered and run easily, and the moving space can be greatly reduced. In addition, the steering mechanism is simple and the manufacturing cost can be significantly reduced. Further, by connecting the forks 2 for mounting the traveling wheels 1 to each other via the arms 5, the rod 6 and the like and rotating them in synchronization, it is possible to provide four or more sets of traveling wheels 1. The plane layout of the traveling wheels 1 can be arbitrarily laid out to some extent. Note that such a steering device can be widely applied to not only a self-propelled carriage but also a driven carriage on which an engine, a motor 12 and the like are not mounted. In this way, the present carriage is constructed and functions, and the steering mechanism is simple. Moreover, there is a feature that a wide space is not required for changing the traveling direction. In addition, a plurality of main carriages can be arranged in a vertical or horizontal direction and used for various purposes such as transporting heavy objects such as vehicles and bridges. Also, various types can be used other than the examples of the type of cylinder 11 used, the structure of the bogie frame 3, and the like.

The carriage according to the present invention is not limited to the above embodiment, but various modifications can be made without departing from the spirit of the present invention.

[0011]

The carriage according to the present invention is constructed as described above, and can be moved in any direction at the same position by changing the direction of the wheels by a small and simple steering mechanism. No moving space is required and the manufacturing cost is reduced.

[Brief description of drawings]

1A is a bottom view of a carrier according to an embodiment of the present invention, FIG. 1B is a side view, and FIG. 1C is a sectional view of a cylinder thereof.

FIG. 2 is an explanatory view of its operation.

3 (a) and 3 (b) are bottom views of a conventional carrier, respectively, and FIG. 3 (c) is a view on arrow c in FIG. 3 (b).

[Explanation of symbols]

 1 Running Wheel 2 Fork 3 Bogie Frame 4 Pin 5 Arm 6 Rod 7 Center Axis 8 Center Arm 9 Rod 10 Bracket 11 Cylinder 12 Motor

Claims (1)

[Claims] 1. A rod for connecting a pair of wheels mounted on the left and right of the lower surface of a bogie to rotate them in the same direction, and a direction of the wheels for driving the rod by being engaged with the rod. A carriage having a piston for changing the carriage.