JPH0581189U - In-vehicle crane stopper mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the crane arm from swinging when an on-vehicle crane is loaded on the bed of a vehicle and traveling. [Structure] A stopper pin 23 is projected to the side of the lower end of the column 1, and a stopper lever 26 is swingably attached to a bracket 24 provided on the pedestal 6, and a cam surface 27 on which the stopper pin 23 follows the stopper lever 26. And this cam surface 27
A locking step portion 28 for locking the stopper pin 23 at the arm retracted position is formed continuously, and the stopper lever 26 is urged downward by the return spring 29.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle-mounted crane that can be mounted on a loading platform such as a truck, and more particularly to a stopper mechanism for holding an arm in a storage position.

[0002]

[Prior Art]

 For the delivery of electric appliances and the transportation of agricultural products, generally, these products are carried on the bed of a small truck (light truck). However, the present situation is that most of the work of loading and unloading these loads on the truck bed depends on manpower. It is possible to use a crane for the above-mentioned loading and unloading work, but it is not possible to use a large crane that is used at construction sites. Therefore, a small crane that can be mounted on the 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. In order to improve workability, it is necessary to allow the arm to rotate at least as a whole, regardless of whether the arm is rotatable and swingable with respect to the column.

[0004]

[Problems to be solved by the device]

 By the way, in the case where the arm can be turned in this way, if the arm can freely turn while the vehicle is running, there is a risk that the driver may run with the arm protruding outside the vehicle due to carelessness.

[0005]

[Means for Solving the Problems]

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

[0006]

[Action]

 By providing a stopper mechanism that locks and holds the support rotatably supported on the loading platform of the vehicle at the arm storage position, it is possible to prevent the arm from protruding outside the vehicle while the vehicle is traveling.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a light truck mounted with an on-vehicle crane to which the stopper mechanism according to the present invention is applied, and FIG. 2 is an overall view of the crane.

The vehicle-mounted crane is mainly composed of a pillar 1, a crane arm 2, a power unit 3 and a rope 4, the pillar 1 is a square pipe, and the lower end of which is a pedestal detachably mounted on a cargo bed with bolts 5. 6 is rotatably supported about a vertical axis, and its upper end is detachably supported by a bracket 8 provided on a torii 7 provided at the front of the loading platform using bolts 9.

The crane arm 2 is swingably supported in a vertical plane via a shaft 11 on a bracket 10 provided on the upper end of the support column 1, and a bracket 12 is provided at the tip thereof, and a pulley 13 is attached to the bracket 12. Also, a rope 4 fixed to the lower part of the column 1 is hung on the pulley 13 and hung downward, and a hook 14 for hooking luggage is attached to the lower end thereof.

Further, the power unit 3 is a motor, a hydraulic pump driven by the motor, a cylinder unit to which hydraulic oil is supplied and discharged from the hydraulic pump, a sub tank for compensating for the piston rod of the cylinder unit, and a hydraulic oil flow path. The valve mechanism for switching between the cylinder unit is rotatable, and the base end of the cylinder unit is freely rotatable to the bracket 16 provided at the middle of the column 1 and the tip of the piston rod is freely rotatable to the bracket 17 provided at the crane arm 2. Connected to.

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 protruding downward from the block 21 is inserted into the upper surface of the pedestal 6 to rotate the column 1. It is freely supported and stopper pins 23 project laterally from the block 21.

A bracket 24 is provided on the pedestal 6, a horizontal shaft 25 is installed on the bracket 24, and a base end portion of a stopper lever 26 is rotatably attached to the horizontal shaft 25, and a cam is attached to the stopper lever 26. A surface 27 and a locking step portion 28 continuous with the cam surface 27 are formed, and a return spring 29 is provided between the bracket 24 and the stopper lever 26 to urge the stopper lever 26 downward. ing. Further, a stopper 30 is provided on the upper surface of the pedestal 6 to come into contact with the support 1 when it is rotated to a predetermined angle.

In the above, when the luggage is placed on the loading platform, the operator turns the crane arm 2 to the hanging position, then drives the power unit 3 to compress the cylinder unit 2 to move the crane arm 2 to the position shown in FIG. 2 As indicated by the chain double-dashed line in Fig. 2, hook the hook 14 at the tip of the rope 4 on the load, and then drive the power unit 3 to extend the cylinder unit to extend the crane arm 2 in the same manner. Lift it up like this and turn it to the mounting position.

When the crane arm 2 is rotated to the arm retracted position (positioned along the torii 7 as shown in FIG. 1) after the work is completed, the support column 1 is also integrated around the vertical axis. Then, the stopper pin 23 attached to the column 1 comes into contact with the cam surface 27 of the stopper lever 33 and pushes up the stopper lever 26 against the spring 29, and finally the stopper pin 23 contacts the stopper 40. At the same time, the crane arm 2 enters the locking step portion 28 of the stopper lever 26, and 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, since the rotation of the support column 1 is restricted by the arm storage position by the engagement of the stopper pin 23 and the stopper 40, the support column 1 is securely stopped at the arm storage position, and is retained there. can do.

Further, when the crane arm 2 is taken out from 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 portion 28. In the present invention, the size of the entire crane is set within the range surrounded by the torii gate 7 when it is stored and is seen from the rear.

Next, another example of the stopper mechanism will be described with reference to FIGS. 6 to 8. The stopper mechanism 40 has a disc 41 fixed to the lower end of the column 1, and an engaging hole 42 is formed in the disc 41. Then, a bracket 43 having a U-shaped cross section is fixed on the pedestal 6, and a stopper pin 44 that can be inserted into the engagement hole 42 of the disc 41 is vertically movably inserted into the bracket 43. Is urged upward by a spring 46 provided between the locking ring 45 and the bracket 44. The lower end of the stopper pin 44 is exposed to the inside of the pedestal 6, and is connected to the tip of a lever 48 pivotally supported in the pedestal 6 by a shaft 47 via a link member 49.

In this stopper mechanism 40, when the support column 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 disc 41. Therefore, the column 1 and hence the crane arm 2 are locked and held in the arm retracted position. Further, when the lever 48 is lifted, the stopper pin 44 is lowered via the link member 49 and is disengaged from the disc 41, so that the column 1 can be rotated.

Next, another example of the stopper mechanism will be described with reference to FIG. This stopper mechanism 50 also has a circular plate 51 fixed to the lower end of the column 1, an engaging hole 52 is formed in the circular plate 51, and a U-shaped cross section is formed on the side of a fixing member 53 fixed on the pedestal 6. The bracket 54 is fixed to the bracket 54, and the stopper pin 55, which can be inserted into the engaging hole 52 of the disc 51, is vertically movably inserted into the bracket 54. The stopper pin 55 connects the locking ring 56 and the bracket 54 to each other. It is urged upward by a spring 57 interposed between the stopper pin 55 and the lower end of the stopper pin 55 is an L-shaped bent portion 55a.

In this stopper mechanism 50 as well, the stopper pin 55 is inserted into the engagement hole 52 of the disk 51 when the support column 1 is rotated to the arm storage position, so that the support column 1 and the crane arm 2 are inserted. Is locked and held in the arm storage position, and the bent portion 55a of the stopper pin 55 is pushed down to come off from the disc 51, so that the column 1 can be rotated.

[0021]

[Effect of the device]

 As described above, according to the present invention, since the stopper mechanism that locks and holds the support column that is rotatably supported on the loading platform of the vehicle at the arm storing position is provided, the arm can move outside the vehicle while the vehicle is traveling. It can prevent swinging.

[Brief description of drawings]

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

[Fig. 2] Overall view of the crane

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

FIG. 4 is an enlarged plan view of an essential part of the stopper mechanism section.

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

FIG. 6 is an enlarged front cross-sectional view of an essential part of another stopper mechanism portion according to the present invention.

FIG. 7 is an enlarged plan view of an essential part of the stopper mechanism section.

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

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

[Explanation of symbols]

1 ... Prop, 2 ... Arm, 3 ... Power unit, 4 ... Rope, 6 ... Pedestal, 7 ... Torii, 20, 40, 50 ... Stopper mechanism, 23 ... Stopper pin, 26 ... Stopper lever, 2
7 ... Cam surface, 28 ... Lock step, 41, 51 ... Disc, 4
2, 52 ... Engagement holes, 44, 55 ... Stopper pins.

Claims (2)

[Scope of utility model registration request] 1. A support column rotatably supported on a loading platform of a vehicle about a vertical axis, and a support member pivotably supported by an upper end of the support column in a vertical plane and a lifting member hanging from a tip end thereof. In a vehicle-mounted crane equipped with
A stopper pin is provided on the side of the pillar, and a stopper lever urged downward is swingably arranged on the side of the cargo bed. The stopper lever follows the cam surface and the cam surface is continuous with this cam surface. Then, a stopper mechanism for a vehicle-mounted crane, characterized in that a stopper step portion is formed which engages with the stopper pin when the column is rotated to the arm storage position. 2. A support column rotatably supported on a loading platform of a vehicle about a vertical axis, and an upper end portion of the support column pivotably supported in a vertical plane and a lifting member hanging from a tip thereof. In an on-vehicle crane equipped with a
A plate member having an engagement hole is provided on the column, and a stopper pin that can be inserted into the plate member is provided on the cargo bed side so as to be vertically movable when the column rotates to an arm storage position. This is a stopper mechanism for an on-vehicle crane.