JPS5995085U

JPS5995085U - crane boom

Info

Publication number: JPS5995085U
Application number: JP19183582U
Authority: JP
Inventors: 周二片山
Original assignee: 株式会社タダノ
Priority date: 1982-12-17
Filing date: 1982-12-17
Publication date: 1984-06-28
Also published as: JPS6338219Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は、本考案の１実施例を示すクレーンブームの全
縮小説明図、第２図は第１図から第１シリンダを伸長さ
ｉた状態の説明図、第３図は第２図から更に第２シリン
ダを中間量だけ伸長させた状態の説明図、−第４図は、
第３図から第２シリンダを全量伸長させた状態の説明図
、第５図は、第２図のＡ−Ａ矢視図である。゛１・・・・・・基端ブーム、２・・・・・・外癲ブーム
、３・・・・・・中間ブーム、４・・・・・・内側ブー
ム、５・・・・・・第１シリンダ、８・・・・・・第２
シリンダ、１７・・・・・・折り返し案内具、１４・・
・・・・滑車、１８・・・・・・縮小用ロープ。Fig. 1 is a fully reduced explanatory view of a crane boom showing one embodiment of the present invention, Fig. 2 is an explanatory view of the first cylinder in the extended state i from Fig. 1, and Fig. 3 is an explanatory view from Fig. 2. An explanatory diagram of the state in which the second cylinder is further extended by an intermediate amount, FIG.
FIG. 3 is an explanatory view of the state in which the second cylinder is fully extended, and FIG. 5 is a view taken along the line A--A in FIG. 2.゛1... Proximal boom, 2... External boom, 3... Intermediate boom, 4... Inner boom, 5... 1st cylinder, 8...2nd cylinder
Cylinder, 17...Folding guide, 14...
...Pulley, 18...Reduction rope.

Claims

[Scope of utility model registration request]

An outer boom is telescopically inserted into the base boom, an intermediate boom is inserted into the outer boom, and an inner boom is telescopically inserted into the intermediate boom. Two cylinders are arranged internally in an inverted manner, and the base ends of the cylinder tubes of the first and second cylinders are connected and fixed to the base ends of the outer boom and the intermediate boom, respectively. A folding guide is installed at the tip of the cylinder tube of the second cylinder, and a pair of pulleys are installed on the left and right sides at the base end of the cylinder tube of the second cylinder. When the second cylinder is driven to contract, the second cylinder is rotated around one of the pulleys, the folding guide, and the other of the pulleys so as to be inverted and folded in turn, and then the other end is fixed to the inner boom. A crane boom characterized in that an inner boom is retracted into an intermediate boom via a retracting lobe.