JPH02112692U

JPH02112692U -

Info

Publication number: JPH02112692U
Application number: JP2243989U
Authority: JP
Priority date: 1989-02-27
Filing date: 1989-02-27
Publication date: 1990-09-10

Description

[Brief explanation of drawings]

第１図は本考案の実施例にかかるジブ内蔵式ブ
ームの縦断面図、第２図及び第３図はそれぞれ第
１図の−及び−断面図、第４図は第１図
のジブ内蔵式ブームの分解斜視図、第５図は第１
図のジブ内蔵式ブームにおけるジブ先端部の側面
図、第６図は第１図のジブ内蔵式ブームの使用状
態図、第７図は公知のジブ内蔵式ブームの縦断面
図、第８図及び第９図はそれぞれ第７図の−
及び−断面図、第１０図は他の従来例を示す
ジブ内蔵式ブームの断面図である。１……ブーム、３……ジブ、３ａ……ジブ基端
部、４……牽引装置（ウインチ装置）、５……ジ
ブ引出し用ロープ、５ａ，５ｂ……端部、８……
シーブ、１３……先端ブーム、１３ａ……ブーム
先端、３３……凹溝。 Fig. 1 is a vertical cross-sectional view of a boom with built-in jib according to an embodiment of the present invention, Figs. 2 and 3 are - and - cross-sectional views of Fig. 1, respectively, and Fig. 4 is a boom with built-in jib of Fig. 1. Exploded perspective view of the boom, Figure 5 is the first
FIG. 6 is a side view of the jib tip of the boom with built-in jib shown in FIG. 1, FIG. 7 is a longitudinal sectional view of a known boom with built-in jib, FIG. Figure 9 is the − of Figure 7, respectively.
FIG. 10 is a sectional view of another conventional example of a boom with a built-in jib. DESCRIPTION OF SYMBOLS 1... Boom, 3... Jib, 3a... Jib base end, 4... Traction device (winch device), 5... Rope for pulling out the jib, 5a, 5b... End part, 8...
Sheave, 13...tip boom, 13a...boom tip, 33...concave groove.

Claims

[Scope of utility model registration request]

A box-shaped jib 3 is telescopically stored inside the box-shaped boom 1, and one end 5a is connected to the jib 3.
Jib pulling rope 5 fixed to the base end 3a of
By passing the other end 5b side through the space between the jib 3 and the boom 1 and bypassing the boom tip 13a, and by pulling the other end 5b of the rope 5 with the traction device 4, the jib 3 is attached to the boom. A boom with a built-in jib that can be extended with respect to A boom with a built-in jib, characterized in that a pull-out rope 5 is installed through the groove 33.