JPS63154592U

JPS63154592U -

Info

Publication number: JPS63154592U
Application number: JP4628887U
Authority: JP
Priority date: 1987-03-27
Filing date: 1987-03-27
Publication date: 1988-10-11

Description

[Brief explanation of the drawing]

第１図は本考案の実施例にかかる伸縮ブームの
一部切欠側面図、第２図は同ブームの部分拡大側
面図、第３図は同ブームの屈折状態の第２図相当
図、第４図は第２図―線断面図、第５図は同
ブームによるクレーン作業状況を示す側面図であ
る。１……基本ブーム、２……中間ブーム、３……
屈伸可能な先端ブーム、３ａ……先端ブームの下
部セクシヨン、３ｂ……同上部セクシヨン、５…
…両セクシヨンを連結する水平軸、８，８……屈
伸用シリンダ、４……伸縮シリンダ。 Fig. 1 is a partially cutaway side view of a telescopic boom according to an embodiment of the present invention, Fig. 2 is a partially enlarged side view of the same boom, Fig. 3 is a view corresponding to Fig. 2 of the boom in a bent state, and Fig. 4 The figure is a sectional view taken along the line shown in FIG. 2, and FIG. 5 is a side view showing the crane working situation using the same boom. 1...Basic boom, 2...Intermediate boom, 3...
Bending and extensible tip boom, 3a... lower section of the tip boom, 3b... upper section of the same, 5...
...Horizontal shaft connecting both sections, 8, 8...bending cylinder, 4... telescopic cylinder.

Claims

[Scope of utility model registration request]

It consists of a box-shaped boom with at least three stages including a basic boom and a tip boom, and is telescopically operated using one or more telescoping cylinders installed inside as a driving source, and at least the tip boom is telescopic inside in the extended state. In a telescopic boom of a crane that does not have a cylinder and is configured to be telescopically driven by a rope-type boom telescoping device that transmits the telescoping force of the boom driven by a telescoping cylinder to another boom, the above-mentioned extension In this state, there is no telescoping cylinder inside the boom, and the boom, which is driven to extend by a rope-type boom telescoping device, is divided into an upper section and a lower section at an intermediate position in the length direction where the boom protrudes outside the lower boom in the extended state. and the two sections are rotatably connected around a horizontal axis at opposing ends, so that the boom can be bent and extended into a straight state and a bent state where the upper section is tilted forward. A telescoping boom for a crane, characterized in that a bending/extending cylinder is provided between the connected ends of the two sections.