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Telescopic boom

A telescopic arm and telescopic sleeve technology, applied in the field of telescopic arms, can solve the problems of increased manufacturing cost, increased base cost, difficult processing, etc., and achieve the effects of light buckling strength, easy assembly operation, and excellent manufacturability

Inactive Publication Date: 2012-07-11
KOBELCO CONSTR MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the radius of curvature of the lowermost end of the ellipse is smaller than the radius of curvature of the telescopic arm of prior art 1, there is a problem that this part is easily buckled.
In addition, since it must be formed into an ellipse, there is a problem that the manufacturing cost of the arm increases
Furthermore, since the processing of the base supporting the telescopic insertion arm is difficult, there is a problem that the cost of the base also increases.
Furthermore, when assembling the arms, there is also a problem that it is difficult to adjust the gap between the arms using a spacer.

Method used

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Embodiment Construction

[0018] Hereinafter, the telescopic arm of embodiment of this invention is demonstrated. First, refer to figure 1 and figure 2 The telescopic arm according to Embodiment 1 of the present invention will be described.

[0019] figure 1 Reference numeral 11 shown indicates a self-propelled crane equipped with a telescopic boom B described below. The self-propelled crane of Embodiment 1 is a wheeled crane. This self-propelled crane 11 is equipped with a mobile trolley 12. The mobile trolley 12 is provided with front wheels 12a on the front side in the traveling direction on the right side in the figure, and on the rear side in the traveling direction on the left side in the figure. There are rear wheels 12b. On this mobile trolley 12 is mounted an upper revolving body 13 that freely revolves around a vertical axis via a revolving bearing 12c. A cab 14 is disposed on the front side of the upper swing body 13 . On one side of the cab 14 , a telescopic arm B that is tilted by ...

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PUM

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Abstract

A telescopic boom (1) of the present invention comprises a base boom (1) and inserted booms (2 to 5) telescopically inserted into this base boom (1). A cross-section of each of the inserted booms (2 to 5) cut in a direction orthogonal to a longitudinal direction thereof is formed by a lower half portion on the side of a ventral surface and an upper half portion on the side of a rear surface. The lower half portion is formed by an arc part along a virtual arc (22) of a semicircle or less having an opening width Wr which is smaller than an outer width Wo of the inserted booms (2 to 5), and a pair of left and right inclined flat plate portions (24) continuous to this arc part. Left and right ends of the upper half portion and left and right ends of the lower half portion are coupled to each other by the inclined flat plate portions (24) formed in the lower half portion.

Description

technical field [0001] The present invention relates to a telescopic arm capable of being mounted on a freely rotatable upper revolving body of a wheeled crane or the like in a pitching manner. More specifically, it relates to a telescopic arm that is not only lightweight but also has high buckling strength, an arm and a pad with excellent manufacturability, and easy gasket adjustment during assembly. Background technique [0002] The telescopic boom that can be mounted on a swingable upper swing body such as a wheeled crane in a pitching manner is preferably made as small as possible for the purpose of weight reduction and miniaturization. In addition, it is preferable that it can be manufactured through a simple manufacturing process. [0003] As the first prior art of such a telescopic arm, the invention described in Japanese Patent Application Publication No. H9-501384 is known, for example. In this prior art, in a cross-sectional shape cut in a direction perpendicular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C23/687B66C23/36
CPCB66C23/701
Inventor 奥村昌好中山浩树塙洋二横山俊辅元山功
Owner KOBELCO CONSTR MASCH CO LTD