JPS6313996U

JPS6313996U -

Info

Publication number: JPS6313996U
Application number: JP10296587U
Authority: JP
Priority date: 1987-07-03
Filing date: 1987-07-03
Publication date: 1988-01-29
Also published as: JPH0420872Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る三段同時伸縮ブームの側
面図、第２図は本考案のその他の実施例を示す説
明図、第３図は従来の三段同時伸縮ブームの側面
図、第４図は縮小用ワイヤロープを内側ブーム内
に配設した三段伸縮ブームの説明図である。１；外側ブーム、２；中間ブーム、３；内側ブ
ーム、４；伸縮用油圧シリンダ、７；支承具、１
１；ロツド、１２；支承具、１３；案内具、１４
；支承具。 Fig. 1 is a side view of a three-stage simultaneous telescopic boom according to the present invention, Fig. 2 is an explanatory view showing another embodiment of the present invention, Fig. 3 is a side view of a conventional three-stage simultaneous telescopic boom, and Fig. 4 The figure is an explanatory view of a three-stage telescopic boom in which a reduction wire rope is disposed inside the inner boom. 1; Outer boom, 2; Intermediate boom, 3; Inner boom, 4; Telescoping hydraulic cylinder, 7; Support, 1
1; Rod, 12; Supporting tool, 13; Guide tool, 14
;Support.

Claims

[Scope of claim for utility model registration] An outer boom 1, an intermediate boom 2 telescopically inserted into the outer boom 1, an inner boom 3 telescopically inserted into the intermediate boom 2, and an intermediate boom relative to the outer boom 1. In order to extend and retract the boom 2, the tip of the piston rod is fixed to the base end of the outer boom 1, and the end of the piston rod side of the cylinder is fixed to the base end of the intermediate boom 2, thereby connecting the outer boom 1 and the intermediate boom 2. A hydraulic cylinder for expansion and contraction is installed internally between the
an extension synchronization device for extending the inner boom 3 relative to the intermediate boom 2 in synchronization with the extension movement of the intermediate boom 2 relative to the outer boom 1, and the outer boom 1;
A three-stage simultaneous telescopic boom comprising a retraction synchronization device for retracting the inner boom 3 with respect to the intermediate boom 2 in synchronization with the retracting movement of the intermediate boom 2, provided at the cylinder tip of the telescopic hydraulic cylinder. a support 7 that slides or rolls into contact with the lower inner surface of the inner boom 3 or the tip boom telescopically inserted into the inner boom 3; and the telescopic hydraulic cylinder 4.
a rod 11 having approximately the same length as the cylinder 5, one end of which is fixed to the base end of the outer boom 1, and extends into the three-stage simultaneous telescopic boom at a position below the telescopic hydraulic cylinder; The rod 11
A support 12 and a rod 11 provided at the tip of the inner boom 3 or sliding or rolling contact with the lower inner surface of the tip boom telescopically inserted into the inner boom 3.
The cylinder 5 is provided at the tip of the telescopic hydraulic cylinder 4 and slides or rolls into contact with the cylinder 5.
a guide tool 13 that supports the intermediate boom 2;
A support device for a telescoping hydraulic cylinder in a three-stage simultaneous telescoping boom, comprising a support 14 provided at the base end of the rod 11 and supporting the rod 11 by sliding or rolling contact therewith.