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Telescopic boom device

A technology for telescopic beams and installation parts, which is applied to hoisting devices, cranes, etc., and can solve the problems of difficult arrangement and reduced strength of the beam main body 21

Inactive Publication Date: 2006-04-05
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Extremely speaking, it will happen that the beam main body 21 is difficult to arrange on the vehicle body
On the contrary, under the condition that the cross-sectional shape of the base end beam 21a is to be kept constant, the thickness of the sliding pad is correspondingly reduced due to the cross-sectional shape of the middle beam 21b and the front end beam 21c, which will make the strength of the two sections of beams 21b, 21c reduce

Method used

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Examples

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Embodiment Construction

[0030] Below, refer to Figure 1 to Figure 10 One embodiment of the telescopic beam device of the present invention will be described.

[0031] Depend on figure 1 It can be seen that the telescopic beam device of this embodiment is composed of a first beam 1; a second beam 2 accommodated in the first beam 1 and capable of free expansion and contraction; and a telescopic hydraulic cylinder not shown in the figure.

[0032] The first beam 1 is composed of the following parts: a main part 1a formed into a straight bottomless square cylinder; a bushing setting part 1c integrally provided with one end of the main part 1a through a partition 1b; The sliding pad installation part 1e provided integrally with the other end of the above-mentioned main part 1a through the partition 1d; the bushing 1f provided on the above-mentioned bushing installation part 1c; the bushing 1f provided on the above-mentioned sliding pad installation part 1e The sliding liner 1g.

[0033] Such as fig...

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PUM

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Abstract

A telescopic boom device is constituted of a first boom (1), a second boom (2) telescopingly received in the first boom (1), and a telescopic cylinder. The booms (1, 2) are constructed, respectively, from main portions (1a, 2a), boss installation portions (1c, 2c) integrally provided at one ends of the main portions (1a, 2a) with separation walls (1b, 2b) in between, slide pad installation portions (1e, 2e) integrally provided at the other ends of the main portions (1a, 2a) with separation walls (1d, 2d) in between, bosses (1f, 2f) arranged at the boss installation portions (1c, 2c), and slide pads (1g, 2g) arranged at the slide pad installation portions (1e, 2e). The slide pads (1g) are attached to an inner surface of the slide pad installation portion (1e) of which width and height are larger than those of the main portion (1a). Further, the slide pads (2g) are attached to an outer surface of the slide pad installation portion (2e) of which width and height are smaller than those of the main portion (2a). The structure above prevents the outside dimensions of a cross-section of a boom from becoming larger even when the slide pads are attached.

Description

technical field [0001] The present invention relates to a telescopic beam device included in a hydraulic working machine such as a lift truck and an aerial work vehicle, and particularly relates to the structure of each beam of the telescopic beam device. Background technique [0002] In the past, on hydraulic working machines such as lift loading and unloading trucks and aerial work vehicles, there were telescopic telescopic beam devices that can be telescopically telescopic by means of telescopic hydraulic cylinders. [0003] Figure 12 It is a cross-sectional view showing an example of such a conventionally known telescopic beam device. As can be seen from this figure, the conventional telescopic beam device is composed of the following various parts: a straight cylindrical base end beam 21a with an open end; a straight cylindrical intermediate beam 21b that is inserted into the base end beam 21a and can freely expand and contract; In the middle beam 21b, there is a stra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66F9/08B66C23/68B66F9/06B66F11/04B66C23/687B66C23/697B66C23/70
CPCB66C23/707B66F9/08B66C23/68B66F9/06B66F11/04
Inventor 五木田修
Owner NIHON KENKI CO LTD