JP2574325Y2 - Stopper mechanism for vehicle-mounted cranes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted crane that can be mounted on a carrier such as a truck, and more particularly to a stopper mechanism for holding an arm in a storage position.

[0002]

2. Description of the Related Art In general, for delivery of electric appliances and transportation of agricultural products, these products are carried on a carrier of a small truck (light truck). However, at present, the work of placing or unloading these loads on the truck bed is largely dependent on manual labor. It is conceivable to use a crane for the above-mentioned luggage lifting work,
Large cranes such as those used in construction sites cannot be used. Therefore, a small crane that can be mounted on a truck bed is being developed.

In such a small crane, an arm is attached to a support provided on a loading platform, and the support is rotatable so that the arm can swing up and down with respect to the support, or the support is fixed. Regardless of whether the arm is rotatable and swingable with respect to the column, it is necessary to enable the arm to rotate at least as a whole in order to improve workability.

[0004]

In the case where the arm can be turned in this way, if the arm can be freely turned while the vehicle is running, the arm may be protruded out of the vehicle due to the carelessness of the driver. There is a risk of running.

[0005]

In order to solve the above-mentioned problems, a vehicle-mounted crane according to the present invention is provided with a stopper mechanism for locking and holding a column rotatably supported on a carrier of a vehicle at an arm storage position. Was.

[0006]

The arm can be prevented from protruding out of the vehicle while the vehicle is running by providing a stopper mechanism for locking and supporting a column rotatably supported on the bed of the vehicle at the arm storage position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state where a vehicle-mounted crane to which a stopper mechanism according to the present invention is applied is mounted on a light truck.
FIG. 2 is an overall view of the crane.

The on-board type crane mainly includes a column 1, a crane arm 2, a power unit 3 and a rope 4. The column 1 is formed of a square pipe, and the lower end thereof is perpendicular to a pedestal 6 detachably mounted on a loading platform with bolts 5. It is rotatably supported about a shaft, and the upper end is detachably supported using a bolt 9 on a bracket 8 provided on a torii 7 provided at the front of the loading platform.

The crane arm 2 is supported by a bracket 10 provided on the upper end of the column 1 via a shaft 11 so as to be swingable in a vertical plane. A bracket 12 is provided at the tip of the bracket 10, and a pulley 13 is mounted on the bracket 12. A rope 4 that is pivotally supported and fixed to the lower portion of the column 1 is hung over a pulley 13 and hangs downward, and a hook 14 for hooking a load is attached to the lower end thereof.

The power unit 3 includes a motor, a hydraulic pump driven by the motor, a cylinder unit for supplying and discharging hydraulic oil from the hydraulic pump, a sub-tank for compensating a piston rod of the cylinder unit to enter and exit, and a hydraulic oil flow path. A switching valve mechanism is integrated, and a base end of a cylinder unit is provided on a bracket 16 provided at an intermediate portion of a column 1, and a tip of a piston rod is connected to a crane arm 2.
Are rotatably connected to the brackets 17 provided at the respective positions.

On the other hand, the pedestal 6 is provided with a stopper mechanism 20. As shown in FIGS. 3 to 5, the stopper mechanism 20 has a block 21 fixed to the lower end of the column 1 and a shaft 22 projecting downward from the block 21 is inserted into the upper surface of the base 6 to rotate the column 1. The stopper pin 23 is freely supported, and a stopper pin 23 projects laterally from the block 21.

A bracket 24 is provided on the pedestal 6,
A horizontal shaft 25 is mounted on the bracket 24, and a base end of a stopper lever 26 is rotatably mounted on the horizontal shaft 25. The cam surface 27 and the cam surface 2
7 is formed, and a return spring 29 is interposed between the bracket 24 and the stopper lever 26 to urge the stopper lever 26 downward. In addition, a stopper 30 is provided on the upper surface of the pedestal 6 to come into contact with the support 1 when the support 1 is rotated to a predetermined angle.

In the above, when the load is to be placed on the carrier, the operator turns the crane arm 2 to the suspended position, and then drives the power unit 3 to cause the cylinder unit to perform a compression movement, thereby moving the crane arm 2 to the position shown in FIG. After the hook 14 at the end of the rope 4 is hooked on the luggage, the power unit 3 is driven to extend the cylinder unit, and the crane arm 2 is moved as shown by the one-dot chain line in FIG. Raise and rotate to the mounting position.

When the work is completed and the crane arm 2 is rotated to the arm storage position (the position along the torii gate 7 as shown in FIG. 1), the support column 1 is also integrally rotated about the vertical axis. The stopper pin 23 attached to the support 1
Together but pushed against the stopper lever 26 to the return spring 29 abuts against the cam surface 27 of the stopper lever 26, and finally the stopper pin 23 abuts against the stopper 30, the step portion 28 of the stopper lever 26 Then, the crane arm 2 is locked and held at the arm storage position. This can prevent the crane arm 2 from swinging outward.

In this case, the stopper pin 23 and the stopper 3
Since the rotation of the column 1 is restricted at the arm storage position by the engagement with the column 0 , the column 1 can be reliably stopped at the arm storage position and locked and held there.

When the crane arm 2 is taken out of the arm storage position, the operator lifts the stopper lever 26 upward to release the locking of the stopper pin 23 by the locking step 28. In the present invention, the dimensions of the entire crane are stored in a stored state so as to fall within a range surrounded by the torii gate 7 when viewed from behind.

Next, another example of the stopper mechanism is shown in FIG.
A description will be given based on FIGS. This stopper mechanism 40
Fixed a disk 41 to the lower end of the column 1,
Has an engaging hole 42 formed therein. Then, a bracket 43 having a U-shaped cross section is fixed on the pedestal 6.
A stopper pin 44 which can be inserted vertically into the engagement hole 42 of the disc 41 is inserted through the engagement hole 42 in a vertically movable manner, and the stopper pin 44 is moved upward by a spring 46 interposed between the locking ring 45 and the bracket 43. It is energizing. This stopper pin 4
The lower end of the lever 4 faces the pedestal 6, and the link member 4 is attached to the distal end of a lever 48 pivotally supported by the shaft 47 in the pedestal 6.
9.

In this stopper mechanism 40, the support 1
Is rotated to the arm storage position, the stopper pin 23 comes into contact with the stopper 30, and the stopper pin 44 is inserted into the engagement hole 42 of the disk 41, so that the column 1 and thus the crane arm 2 are moved to the arm storage position. It is locked and held. By raising the lever 48, the stopper pin 44 is lowered via the link member 49,
Since it comes off the disk 41, the column 1 becomes rotatable.

Next, another example of the stopper mechanism is shown in FIG.
It will be described based on. The stopper mechanism 50 is also used for the support 1
A disc 51 is fixed to the lower end of the base plate, an engagement hole 52 is formed in the disc 51, and a bracket 54 having a U-shaped cross section is fixed to the side of a fixing member 53 fixed on the pedestal 6. A stopper pin 55 that can be inserted into the engagement hole 52 of the disc 51 is inserted through the bracket 54 so as to be vertically movable.
Is urged upward by a spring 57 interposed between the locking ring 56 and the bracket 54, and the stopper pin 55
Is formed into an L-shaped bent portion 55a.

In this stopper mechanism 50, the support 1
Is rotated to the arm storage position, so that the stopper pin 55 is inserted into the engagement hole 52 of the disk 51, so that the column 1 and thus the crane arm 2 are locked and held at the arm storage position, and the stopper pin 55 is folded. When the curved portion 55a is depressed, the column 1 comes off the disk 51, so that the column 1 can rotate.

[0021]

[Effects of the Invention] As described above, according to the present invention,
Since the stopper mechanism for locking and supporting the column rotatably supported on the bed of the vehicle at the arm storage position is provided, it is possible to prevent the arm from swinging out of the vehicle while the vehicle is traveling.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a vehicle-mounted crane to which a stopper mechanism according to the present invention is applied is mounted on a light truck.

FIG. 2 is an overall view of the crane.

FIG. 3 is an enlarged front view of a main part of the stopper mechanism.

FIG. 4 is an enlarged plan view of a main part of the stopper mechanism.

FIG. 5 is an enlarged side view of a main part of the stopper mechanism.

FIG. 6 is an enlarged front sectional view of a main part of another stopper mechanism according to the present invention .

FIG. 7 is an enlarged plan view of a main part of the stopper mechanism.

FIG. 8 is an enlarged side view of a main part of the stopper mechanism.

FIG. 9 is an enlarged front view of a main part of still another stopper mechanism according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Prop, 2 ... Crane arm (arm) , 3 ... Power unit, 4 ... Rope, 6 ... Pedestal, 7 ... Torii, 20, 4
0,50 ... stopper mechanism, 23, 44 and 55 ... stopper pin, 26 ... stopper lever 27 ... cam surface, 28 ... step portion, 41, 51 ... disc, 42, 52 ... engaging hole.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66C 23/00-23/94

Claims (1)

(57) [Scope of request for utility model registration] 1. A support column rotatably supported about a vertical axis on a carrier of a vehicle, and a support member rotatably supported on an upper end portion of the support column in a vertical plane and hanging from a tip thereof. In a vehicle-mounted crane with an arm that performs
A stopper pin protrudes from the side of the support, and a stopper lever urged downward is swingably disposed on the carrier side, and a cam surface which the stopper pin follows the stopper lever and a cam surface continuous with the cam surface. A stopper step for engaging the stopper pin when the column is turned to the arm storage position.