JPH0581184U - On-board crane arm structure - Google Patents

Abstract

(57) [Summary] [Purpose] Expand the work area of in-vehicle cranes. [Structure] In the crane arm 2, the base ends of two links 11 and 12 are pivotally supported by shafts 13 and 14 on a bracket 10 provided on the upper end of a column 1 so as to be swingable in a vertical plane, and the tip end is A parallel link arm 18 is rotatably supported on the bracket 15 by shafts 16 and 17, and an extension arm 20 is rotatably supported on a tip bracket 15 of the parallel link arm 18 by a pole 19. .

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 particularly to a structure of an arm that suspends a hanging member.

[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 bed of a truck is being developed, and such a small crane includes one arm pivotally supported by a support column.

[0004]

[Problems to be solved by the device]

 However, in such a vehicle-mounted crane having one arm, it is difficult to suspend the load around the column, and the load may cause the arm to rotate by itself.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is constructed by rotatably attaching an extension arm to the ends of two horizontal link arms that pivotally support the arm on a column.

[0006]

[Action]

 Since the arm consists of two parallel link arms and an extension arm rotatably attached to the tip of it, it is possible to lift the load around the column, and the extension arm is held horizontally by using the parallel link arm. As a result, the arm is less likely to rotate by the load of the luggage.

[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 vehicle-mounted crane to which an arm structure according to the present invention is applied, mounted on a light truck, Fig. 2 is a front view of the main portion of the crane, and Fig. 3 is a diagram of the crane in other states. FIG.

The vehicle-mounted crane is mainly composed of a support column 1, a crane arm 2 and a power unit 3, and the support column 1 is a square pipe whose lower end has a vertical axis on a pedestal 6 which is detachably mounted on a loading platform S by a bolt 5. It is rotatably supported as a center, and its upper end is detachably supported by a bracket 8 provided on a torii 7 provided at the front part of the loading platform S using bolts 9.

In the crane arm 2, the base ends of the two links 11 and 12 are pivotally supported by shafts 13 and 14 on a bracket 10 provided on the upper end of the column 1 so as to be swingable in a vertical plane, and the tip end of the crane arm 2 is supported. A parallel link arm 18 which is rotatably supported on the bracket 15 by shafts 16 and 17, and an extension arm 20 which is rotatably supported by a pole 19 on a tip bracket 15 of the parallel link arm 18. The extension arm 20 is provided with a bracket 21. A rope (including a wire and a chain) 22 is hung downward from the bracket 21, and a hook 23 for hanging luggage is attached to the lower end of the rope 22.

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. Integrating a valve mechanism for switching the cylinder unit, the base end of the cylinder unit is attached to the bracket 25 provided in the middle of the strut 1, and the tip of the piston rod is attached to the bracket 26 provided on the link 12 of the parallel link arm 18. It is rotatably connected.

In the above, when putting a load on the loading platform, the operator turns the crane arm 2 to the hanging position, and then drives the power unit 3 to compress the cylinder unit to move the crane arm 2 to the position shown in FIG. 3, hook the hook 23 at the end of the rope 22 on the load, drive the power unit 3 to extend the cylinder unit, and raise the crane arm 2 as shown in FIG. Turn to the position.

In this case, since the crane arm 2 is composed of the two parallel link arms 18 and the extension arm 20 rotatably attached to the tip thereof, the extension arm 20 can be rotated to the support column 1 side. Luggage can be suspended around the column 1, and the entire working range of the crane arm 2 can be used as the working area. The parallel link arm 18 can be used to extend the extension arm 20 horizontally. Since the crane arm 2 can be held, the crane arm 2 does not easily swing by the load of the load.

[0013]

[Effect of the device]

 As described above, according to the present invention, the extension arm is rotatably attached to the ends of the two parallel link arms that pivotally support the arm, and the working area is expanded. At the same time, it is possible to suppress self-rotation due to the load of the luggage.

[Brief description of drawings]

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

[Figure 2] Front view of the main parts of the crane

FIG. 3 is a front view of a main part of the crane in another state.

[Explanation of symbols]

1 ... Prop, 2 ... Arm, 3 ... Power unit, 6 ... Pedestal, 7 ... Torii, 10, 15 ... Bracket, 18 ... Parallel link arm, 19 ... Pole, 20 ... Extension arm.

Claims (1)

[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
The arm structure of a vehicle-mounted crane, wherein the extension arm is rotatably attached to the ends of two parallel link arms pivotally supported by the column.