JPH03125785U

JPH03125785U -

Info

Publication number: JPH03125785U
Application number: JP3462990U
Authority: JP
Priority date: 1990-03-30
Filing date: 1990-03-30
Publication date: 1991-12-19

Description

[Brief explanation of drawings]

第１図は本考案の第１実施例を示すジブ格納状
態の側面図、第２図は同ジブ張出し時におけるジ
ブ垂下段階、第３図は同ジブ捻転途中、第４図は
同ジブ捻転完了段階をそれぞれ示す側面図、第５
図は第４図状態の正面図、第６図は同状態からさ
らにジブを引上げた状態の正面図、第７図は張出
し完了状態の側面図、第８図は第１図状態の一部
拡大斜視図、第９図は第８図の一部拡大垂直断面
図、第１０図は捻転ガイド溝が設けられた可動連
結具のロツド一部展開し拡大して示す図、第１１
図は本考案の第２実施例を示す第２図相当図、第
１２図は同第１０図相当図、第１３図は本考案の
第３実施例を示すジブ垂下状態の一部拡大側面図
、第１４図は第１３図−線拡大断面図、第１
５図は本考案の第４実施例を示すジブ基端部の側
面図、第１６図は本考案の第５実施例を示す第９
図相当図、第１７図は同第１０図相当図である。１……ブーム、１１，１２……ジブ取付軸、２
……ジブ、２ａ……ジブ左側主桁、２ｂ…同右側
主桁、３……固定連結具、４……可動連結具、４
１……同連結具を構成するロツド、４２……同連
結体、５……捻転ガイド溝、５１……同ガイド溝
の螺旋溝部、５２……同直線溝部、６，９……係
合ピン（係合部材）、Ｒ……ジブ昇降手段として
の補巻ロープ、Ｆ……同補フツク、７……ガイド
板、Ｃ……可動連結具を構成しかつジブ昇降手段
となる油圧シリンダ。 Fig. 1 is a side view of the jib in the retracted state showing the first embodiment of the present invention, Fig. 2 is the jib hanging stage when the jib is extended, Fig. 3 is the jib in the middle of twisting, and Fig. 4 is the completed jib twisting. Side view showing each stage, 5th
The figure is a front view of the state shown in Fig. 4, Fig. 6 is a front view of the state with the jib further pulled up from the same state, Fig. 7 is a side view of the fully extended state, and Fig. 8 is a partially enlarged view of the state shown in Fig. 1. FIG. 9 is a partially enlarged vertical sectional view of FIG. 8; FIG. 10 is a partially expanded and enlarged view of the movable connector rod provided with the torsion guide groove; FIG.
The figure is a view equivalent to Figure 2 showing the second embodiment of the present invention, Figure 12 is a view equivalent to Figure 10, and Figure 13 is a partially enlarged side view of the jib hanging state showing the third embodiment of the present invention. , FIG. 14 is an enlarged cross-sectional view of FIG.
5 is a side view of the base end of the jib showing the fourth embodiment of the present invention, and FIG. 16 is a side view of the base end of the jib showing the fourth embodiment of the present invention.
FIG. 17 is a diagram equivalent to FIG. 10. 1...Boom, 11, 12...Jib mounting shaft, 2
...Jib, 2a...Jib left main spar, 2b...Jib right side main spar, 3...Fixed connector, 4...Movable connector, 4
DESCRIPTION OF SYMBOLS 1... Rod constituting the connecting tool, 42... Connecting body, 5... Twisting guide groove, 51... Spiral groove of the guide groove, 52... Straight line groove, 6, 9... Engaging pin (Engagement member), R... Auxiliary rope as a jib elevating means, F... Auxiliary hook, 7... Guide plate, C... Hydraulic cylinder constituting a movable connector and serving as a jib elevating means.

Claims

[Scope of Claim for Utility Model Registration] 1. Jib mounting shafts are provided on both left and right sides of the tip of the boom, while a fixed connector is installed at the base end of one main girder of the jib, and a movable connector is installed at the base end of the other main girder. This movable coupling is provided to be slidable on the main girder axis and rotatable around the main girder axis with respect to the jib main girder, and this movable coupling is attached to one of the jib mounting shafts. In the connected state, there is a jib hanging process in which the jib is hung down below the boom tip using this connection point as a fulcrum, a jib twisting process in which the jib is twisted after this hanging, and after this twisting, the jib is pulled up and the above-mentioned fixed connector is attached to the other side. The jib is extended to the tip of the boom through the jib lifting process where it is engaged with the jib mounting shaft.
In a crane that stores the jib on the side of the boom in a vertical position with both main girders located above and below through a jib lowering process and a jib twisting process that are opposite to this, the above movable coupling and the jib to which the same coupling is attached are used. One member of the main girder is provided with a torsion guide groove, and the other member is provided with an engaging member that engages with this torsion guide groove, and the torsion guide groove corresponds to the twist angle of the jib in the jib twisting process. It has a spiral groove portion extending over a circumferential angle range and a straight groove portion corresponding to the amount of lifting and lowering of the jib in the jib lifting process and the jib lowering process, and the jib is raised or lowered in the jib twisting process to achieve the above engagement. A jib extension and storage device for a crane, comprising a jib lifting means for moving a mating member within a torsion guide groove. 2. An arc-shaped guide plate is attached to one member of the movable connector and the jib main girder to which the movable connector is attached, and a torsion guide groove is provided on this guide plate, and an engagement member is provided on the other member. The crane jib extension and storage device according to claim 1. 3. The crane jib extension and storage device according to claim 1 or 2, wherein the engaging member is a pin that can be engaged with and disengaged from the torsion guide groove.