JP2519167Y2 - Truck crane - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truck crane equipped with a hoisting machine.

[0002]

2. Description of the Related Art As a truck crane of this type, there is an invention disclosed in Japanese Patent Laid-Open No. 1-317996. This truck crane is provided above the loading platform and has a supporting member on which a turning supporting member is rotatably attached by a vertical axis,
A swivel elevation arm whose base end is pivotally attached to the swivel support member by a horizontal axis, a guide rail horizontally extended below the swivel elevation arm and fixed to the swivel support member, and a base end of the swivel elevation arm. An arm upward tilt support fulcrum that is foldably attached to the middle part by a horizontal axis, a guide member provided at the tip of this arm upward tilt support fulcrum and guided by a guide rail, and a tip of the swivel elevation arm. It is composed of an attached chain block.

In the truck crane constructed as described above, when the swing / elevation arm is swung about the support member about the vertical axis, the chain block is swung. Also, if the swing / elevation arm is pivoted upward about the horizontal axis and is tilted upward, the middle part of the swing / elevation arm is supported by the guide rail via the arm upward tilt support fulcrums. The chain block is supported at a level position, and the chain block is supported at a low level position when the swivel / descend arm is laid down in a state in which the supporting arm for tilting upward of the arm is folded with respect to the swivel / elevation arm.

Further, when the swivel / elevation arm is swung upward, the swivel radius of the chain block is reduced, and when the swivel / elevated arm is swung in the reclining state, the swivel radius of the chain block can be increased. .

[0005]

The above-mentioned truck crane has various characteristics such as being able to be stored in a garage with a low roof and being capable of traveling in a stable state. However, the chain block is moved from the high level position to the low level position. If you do
That is, when the swinging and elevating arm is to be laid down, the operator must support the rotating and elevating and lowering arm with one hand while pressing the rotating handle with the other hand toward the base end side of the guide rail. Since it requires a large amount of force and both hands have to be used, the work is troublesome and there is a safety problem.

The present invention has been made to solve the above problems, and an object thereof is to obtain a truck crane that is easy to operate and safe.

[0007]

SUMMARY OF THE INVENTION A truck crane according to the present invention comprises a lateral arm rotatably mounted horizontally on a column vertically mounted on a bed of a truck, and a base end of which is perpendicular to the lateral arm. , A lifting arm with a hoisting machine attached to the tip, a bracket provided at approximately the middle of the lifting arm, a first support leg with one end axially fixed to the bracket, and one end A second support leg that is axially fixed to the first support leg and has a roller at the other end, and a bending and extending support leg that includes a second support leg and a spring interposed between the bracket, and a lateral arm and a vertical arm. And a protective plate that shields the space formed by the bending and supporting legs.

[0008]

When the arm is rotated in the horizontal state, the hoist can be held at a desired position and the load can be hoisted, hoisted and moved. Further, if the elevation arm is rotated in the vertical direction and supported by the second support leg, the hoisting machine can be held at a high level to lift, hang and move the load.
When the elevation arm is rotated further in the vertical direction, the first support leg and the second support leg become substantially linear, and the roller of the second support leg rolls and moves on the lateral arm by the action of the spring, so that the elevation arm is moved. Can be returned to the horizontal state.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of an embodiment of the present invention, a part of which is shown in cross section, and FIG. 2 is an enlarged view of the main part thereof. In the figure, 1
Is a truck, 2 is its loading platform, 3 is a support column standing on the front end of the loading platform 2, and a vertical axis 4 is rotatably attached to the upper end. Reference numeral 5 denotes a lateral arm having an open upper portion and having a U-shaped cross section. The base end portion is fixed to the vertical axis 4 by welding or the like. 6
Is a lifting arm whose base end is pivotally attached in the vertical direction to the vicinity of the base end of the lateral arm 5 by a pin 7, and the hoisting machine 8 is attached to the other end.

Reference numeral 9 denotes a bracket having a U-shaped cross section, which is provided at a substantially central portion of the lower surface of the elevation arm 6, and 11 has a pin 12 at one end.
The first support leg pivotally fixed to the bracket 9 by the
A second support leg 13 has one end rotatably connected to the first support leg 11 by a pin 14 and a roller 15 attached to the other end,
Reference numeral 16 is a spring interposed between the bracket 9 and the second support leg 13, and these first support leg 11, second support leg 13 and spring 1
A bending and extending type support leg 10 is constituted by 6. Reference numeral 17 denotes a support portion of the first support leg 11 provided on the lower surface of the elevation arm 6, 1
Reference numeral 8 is a stopper of the roller 15 provided at the tip of the inner wall of the lateral arm 5, and 19 is a stopper provided at substantially the center of the inner wall of the lateral arm 5 for preventing the second support leg 13 from floating.

Reference numeral 21 denotes two substantially trapezoidal protection plates whose hypotenuse is fixed to the upper surface of the elevation arm 6 and hangs down on both sides.
In order to make it easier to understand the inner mechanism,
The protective plate 21 is indicated by a chain line. Reference numeral 22 is a lock device for locking the elevation arm 6, and 23 is a handle provided at the tip of the elevation arm 6.

In the present invention constructed as described above, first, the lock device 22 is released, and the elevation arm 6 is horizontally rotated about the vertical axis 4 to hold the hoisting machine 8 at a desired position. The load can then be hoisted, hoisted or moved. Next, when the elevation arm 6 is rotated upward with the pin 7 as the center while holding the handle 23, the second support leg 13 rotates counterclockwise with the pin 14 as the center, as shown in FIG. The roller 15 provided at the position is rolled on the bottom of the lateral arm 5 to move to the right in the figure, stops at the stopper 18, and is held in that position by the spring 16. At this time, the first support leg 11 to which the second support leg 13 is connected is in contact with the support portion 17.
As a result, the elevation arm 6 is supported by the second support leg 13,
The hoisting machine 8 is held at a high level by stopping at the elevation angle defined by the length of the second supporting leg. In this state, the hoisting machine 8 can lift or lower the load, or the lateral arm 5 can be turned to move the load.

In order to return the elevation arm 6 to the original state (horizontal), the elevation arm 6 is rotated further upward while holding the handle 23. As a result, the first support leg 11 and the second support leg 13 are shown in FIG.
As shown in, the first support leg 11 is in the second line.
It stops by hitting a stopper 20 provided on the support leg 13. At this time, the pin 16 connecting the first support leg 11 and the second support leg 13
Is a line 0-0 connecting the pin 11 and the pin 15a of the roller 15
It is located slightly outside (to the right of the figure). Then, when the elevation arm 6 is rotated downward, the roller 15 is moved inward (on the left side in the figure) on the lateral arm 13 by the action of the spring 13, and the bending and extending support leg 10 is automatically folded and the roller 15 in FIG. Then, the elevation arm 6 is held horizontally.

By the way, as is apparent from the figure, when the elevation arm 6 is pulled up and the hoisting machine 8 is held at a high position, the lateral space 5, the elevation arm 6 and the bending / extending support leg 10 form a triangular space A. It is formed. Because of this, the supine arm 6
When returning to the horizontal state, a hand or the like may be caught in the space A, which is extremely dangerous.

Therefore, in the present invention, a substantially trapezoidal protection plate 21 is attached to the elevation arm 6 and hangs down from both sides.
The space A is shielded. As a result, the space A is shielded regardless of the state of the elevation arm 6, so that a safe truck crane can be obtained without the risk of being caught by a hand or the like.

[0016]

As is apparent from the above description, the present invention includes a lateral arm mounted on a column so as to be horizontally rotatable.
A hoisting arm attached to a hoisting machine and rotatably pivoted in a vertical direction on a lateral arm, a bending / extending support leg interposed between the hoisting arm and the lateral arm, and a space formed by these. Since the crane is configured with the protective plate that shields the vehicle, it is possible to obtain a truck crane that has a simple structure, is extremely easy to operate, and is safe.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention showing a part in section.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a diagram illustrating the operation of the present invention.

FIG. 4 is an explanatory view of the operation of the present invention

[Explanation of symbols]

 1 Track 2 Bed 3 Support 4 Vertical axis 5 Horizontal arm 6 Suspension arm 8 Hoisting machine 9 Bracket 10 Bending / expanding type supporting leg 11 First supporting leg 13 Second supporting leg 15 Roller 16 Spring 18, 19 Stopper 21 Protective plate

Claims (1)

(57) [Scope of utility model registration request] 1. A lateral arm having an opening at the top, which is rotatably mounted in a horizontal direction on a supporting column erected on a bed of a truck, and a base end portion of which is rotatably pivoted in a vertical direction to the lateral arm. And a lifting arm with the hoisting machine attached to the tip, and a bracket provided in the middle of this lifting arm,
A first supporting leg whose one end is rotatably supported by the bracket, one end of which is rotatably supported by the first supporting leg, and the other end of which has a roller which rolls on the lateral arm; A bending / extending support leg composed of a second support leg whose movable range is restricted by a stopper provided on the second support leg and a spring interposed between the second support leg and the bracket, and the lateral arm attached to the elevation arm. A truck crane, comprising: a protection plate that shields a space formed by the elevation arm and the bending and supporting legs.