JPS6116306Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a crane equipped with a telescoping boom having one or more booms that are extended and retracted by hydraulic cylinders, and in particular relates to a new mounting structure for side pads attached to the telescoping boom. The purpose of this invention is to provide a mounting structure that has a simple structure, is inexpensive to manufacture, and allows for easy position adjustment of the side pads. In the telescopic boom of a hydraulic telescopic boom crane, the side pads are fitted into the rectangular cylindrical boom of one boom and have side pads attached to both sides of the base of one boom that slide on the inside surface of the other boom. Attach the screw to the side of the
In addition to providing a shearing pin across the side pad and one of the booms, a U-shaped notch is provided from the side between the base of the side pad and the side surface of one of the booms at a position corresponding to the position of the screw and the shearing pin. This is due to the insertion of a shim with .

To explain in detail using the drawings below, one boom 1
In a crane equipped with a telescoping boom, which is telescopically fitted into the other rectangular cylindrical boom 2 using a hydraulic cylinder (not shown), it is attached to the inside of the other boom 2 on both sides of the base end of one boom 1. One or more side pads 3, 3 each are provided for guiding against the sides.

Conventionally, these side pads 3 and 3 were connected to one boom 1.
As shown in Figure 2, a receiving frame 4 made of square steel welded into a rectangular frame shape is protruded from the side of one boom 1, and the side pad 3a is inserted into the receiving frame 4 as shown in Figure 2. , the side pad 3a is screwed onto one of the booms 1 with a screw 5a, and considering that this type of booms 1 and 2 are generally manufactured as so-called canned products, considerable manufacturing errors are inevitable; A structure is adopted in which a plurality of shims 6a are inserted between the base surface of the side pad 3a and the side surface of one boom 2.

However, in the prior art described above, when assembling the boom or when adjusting the shim after long-term use, once it becomes necessary to increase or decrease the shim thickness after assembly, the screw 5a must be completely pulled out. Moreover, it is necessary to change the shim thickness and reassemble the side pad 3a after the side pad 3a is completely extracted from the receiving frame 4. Therefore, not only is the shim adjustment work considerably troublesome, but also the manufacturing process is troublesome since the receiving frame 4 is welded. It is.

On the other hand, according to this invention, as shown in Figure 3,
Something like the receiving frame 4 is not provided, and the pad 3b is screwed onto the side of the boom 1 with a screw 5b, and two shear pins 7, 7 are provided between the pad 3b and the boom 1. Side and pad 3b
A screw 5b is inserted between the base end surface of the shim 6b and a shim 6b having U-shaped notches 8, 9, 9 is inserted from the side (lower side) at a position corresponding to the position of the shear pins 7, 7. In the conventional example shown in FIG. 2, the sliding resistance generated when the pads 3a, 3a slide against the boom 2 is supported by the receiving frame 4, but in this proposal, the sliding resistance caused by the sliding of the pads 3a, 3a with respect to the boom 2 is supported by the receiving frame 4. It is supported by shear resistance. Here, it is preferable to use so-called spring pins as the shear pins 7, 7.

As mentioned above, this invention is easy to manufacture because the material equivalent to the receiving frame 4 is not welded, and the seam 6b can be inserted and removed from the side (upper part), so the screw 5b,
Shim adjustment is possible without completely removing the side pad 3b, and the work is easy.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of a portion of the telescopic boom showing the side pad, and FIGS. 2 and 3 are split perspective views of a conventional example and an example of the present invention, respectively, showing the mounting structure of the side pad. 1: One boom, 2: Other boom, 3,3
a, 3b: side pad, 5b: screw, 7: shear pin, 6b: shim.

Claims (1)

[Scope of utility model registration request] In the telescopic boom of a hydraulic telescopic boom crane, one boom is telescopically fitted into the other square tubular boom, and side pads are attached to both sides of the base of one boom to slide on the inner surface of the other boom. In addition to screwing the side pad onto the side of one boom with a screw, and providing a shear pin between the side pad and one boom, the screw and the shear pin are provided between the base of the side pad and the side of one boom. A side pad mounting structure characterized in that a shim with a U-shaped notch is inserted from the side at a position corresponding to the pin position.