JPS5913439B2 - Foldable crane hook storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a folding crane mounted on a vehicle.
This invention relates to a hook storage device for a folding crane that allows a hook provided at the tip of a tip boom to be stored.

Generally, it is desirable for a foldable crane mounted on a vehicle to occupy a small amount of space when the crane is stored while traveling.

To avoid this, some models have a tip boom that is rotated inward for storage. Conventionally, the hook provided on the tip boom is attached to a bracket protruding from the tip surface of the tip boom. The hook was rotatably supported in the vertical direction, and the hook itself was rotatable.

However, this has the disadvantage that the hook comes into contact with the boom or vehicle due to vibrations when the vehicle is running, causing damage to the boom or vehicle.

Furthermore, in order to widen the working range of the crane, when attempting to lengthen the overall length of the tip boom by minimizing the gap between the tip boom and other booms during storage, the hook protruding from the tip of the tip boom becomes It was a huge hindrance.

The present invention has been made in view of this problem, and includes forming a storage section at the tip of the tip boom so that when the tip boom is rotated to be stored, the hook is automatically stored in the storage section. To provide a hook storage device for a folding crane in which the hook does not protrude when the boom is stored, and the hook does not vibrate and come into contact with other booms, vehicles, etc. during traveling.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 6, reference numeral 1 is a crane-equipped truck, and a folding crane 4 is mounted on a vehicle body 3 behind a driver's cab 2. As shown in FIGS.

In the folding crane 4, a disc-shaped swivel base 5 is rotatably provided on the vehicle body 3, and a support 6 is erected on the swivel base 5.

A first boom 7 is rotatably supported at the tip of the support column 6, and the first boom 7 is formed by bending a base end 7a and a body 7b into a dogleg shape, and the bottom surface of the base end 7a is bent. One end of a cylinder 9 is connected via a bracket 8, and the other end of the cylinder 9 is connected to the lower part of the support column 6, so that the first boom 7 rotates as the cylinder 9 expands and contracts.

Furthermore, a bracket 10 is provided at the tip of the first boom 7 to protrude slightly inward, and a second bracket 10 is provided at the tip of the bracket 10.
The boom 11 is rotatably supported at the rear part of a bracket 12 protruding from the lower surface of the base end of the second boom 110, and the front part of the bracket 12 of the second boom 11 is connected to a cylinder 14 via a rod 13. is connected to the tip of cylinder 1.
The tip of the cylinder 140 is connected to the base end of the bracket 100 of the first boom 7 via the rod 15, and the base end of the cylinder 140 is connected to the bent part of the first boom 7. When the cylinder 14 contracts, the second boom 11 rotates inward and is stored below the first boom 7 parallel to the body 7b of the first boom 7.

An intermediate boom 16 and a tip boom 17 are installed telescopically inside the second boom 11 so as to be freely retractable. It is connected to a telescopic cylinder 18.

There are brackets H9a on both sides at the bottom of the tip of the tip boom 17.
, 19b are provided protrudingly, and a pin 20 is fixedly provided between both brackets 19ay and 19b, a connecting ring 21 is rotatably inserted into the pin 20, and a hook 22 is attached to the connecting ring 21, and a hook 22 is attached to the hook shaft. It is rotatably attached at the tip of 22a.

Further, a housing section 23 is formed at the tip end of the tip boom 17 to accommodate the hook 22 when the tip boom 1γ is rotated to store the tip boom 1γ. Possibly opened, tip boom 17
A notch guide surface 24 is provided in the lower surface of the distal end in a U-shape, and the hook 22 is guided by the notch guide surface 24, and the hook shaft 22a is engaged with the notch guide surface 24.

Furthermore, the tip boom 1 is connected to one end of the notched guide surface 24.
A rectangular guide plate 25 is fixedly fixed to the side surface of the tip of the hook 7 so as to protrude forward, and the guide plate 25 is provided with a slight inclination to the side and rotates the hook 22 in a direction in which it can be stored. .

Next, to explain the operation, the cylinder 14 during work etc.
When extending the second boom 11,
As shown in FIG. 3, the hook 22 protrudes below the tip of the tip boom 17, and when the second boom 11 is rotated inward by retracting the cylinder 14 to store the tip boom 17, as shown in FIG. As shown, the hook 22 moves relative to the tip boom 17 and approaches the tip of the tip boom 17.

When the second boom 11 is subsequently rotated and stored, the hook 22 is guided by the cutout guide surface 24 and stored in the storage section 23, as shown in FIG.

Note that when storing the hook 22, if the hook 22 is located horizontally with respect to the front end surface of the tip boom 17, the hook 22 will come into contact with the guide plate 25 and move vertically as shown in FIG. It rotates so that it becomes storable in the storage section 23.

As described above, the present invention has a simple structure in which a hook is rotatably provided at the lower part of the tip of the tip boom, and a storage portion for storing the hook is formed at the tip of the tip boom, so that the tip boom can be stored. When rotated, the hook is automatically stored in the storage section, so even if the hook vibrates while the vehicle is running, it will not come into contact with other booms or vehicles, etc.
It is extremely safe as there is no damage to the boom or vehicle.

Furthermore, since the hook does not protrude beyond the tip boom when stored, the overall length of the tip boom can be increased.5.
The working range of the crane can be expanded.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a rear view of a truck with a crane, FIG. 2 is an enlarged perspective view showing the main parts of a folding crane, and FIG. 3 is a diagram showing the state during operation. FIG. 4 is a side view of the main parts of the folding crane shown in FIG. It is a diagram. 1... Freight vehicle with crane, 4...
Bending crane, 5... Swivel base, 6...
・Strut, 7...1st boom, 11...
Second boom, 16... Intermediate boom, 17...
...Tip boom, 20...B/, 21...
... Connection ring, 22 ... Hook, 23 ...
... Storage section, 24 ... Notch guide surface, 25.
...Guide board.

Claims (1)

[Claims] 1. In a foldable crane in which the tip boom is rotated inward and stored, a hook is rotatably supported at the bottom of the tip of the tip boom, and a notched guide surface is formed on the lower surface of the tip of the tip boom. 1. A hook storage device for a folding crane, characterized in that the hook is stored in the storage portion by rotating the tip boom to store the hook.