JPH03125784U

JPH03125784U -

Info

Publication number: JPH03125784U
Application number: JP3462890U
Authority: JP
Priority date: 1990-03-30
Filing date: 1990-03-30
Publication date: 1991-12-19

Description

【図面の簡単な説明】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図は捻転ガイド溝が設けられた
連結ロツドを一部展開し拡大して示す図、第１０
図は第１図状態における補助連結具の拡大水平断
面図、第１１図は第１０図−線拡大断面図、
第１２図は本考案の第２実施例を示す第２図相当
図、第１３図は同第９図相当図、第１４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１５図は第１４図Ｙ−Ｙ線拡大断面図、
第１６図は本考案の第４実施例を示すジブ基端部
の側面図、第１７図は従来例を示すジブ格納状態
の一部拡大側面図である。１……ブーム、１１，１２……ジブ取付軸、２
……ジブ、２１，２２……ジブフツト、３……補
助連結具、３２……補助連結具のハウジング、３
３……同連結ロツド、３４……同ロツドの連結体
、４……捻転ガイド溝、４１……同ガイド溝の螺
旋溝部、４２……同直線溝部、６……係合ピン、
７……ピンケース、９……バネ、Ｒ……ジブ昇降
手段としての補巻ロープ、Ｆ……同補フツク、２
００……補助連結具、２０１……補助連結具を構
成する油圧シリンダ、２０１ａ……ハウジングと
してのシリンダチユーブ、２０１ｂ……連結ロツ
ドとしてのピストンロツド、２０３……連結体、
３００……ピンケース。[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a side view of the first embodiment of the present invention when the jib is in the retracted state, Fig. 2 is the jib hanging stage when the jib is extended, and Fig. 3 is the jib in the middle of twisting. Figure 4 is a side view showing the completion stage of the jib twisting.
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. A perspective view, FIG. 9 is a partially unfolded and enlarged view of a connecting rod provided with a torsion guide groove, and FIG. 10 is a perspective view.
The figure is an enlarged horizontal sectional view of the auxiliary connector in the state shown in Fig. 1, and Fig. 11 is an enlarged sectional view taken along the line of Fig.
Fig. 12 is a view corresponding to Fig. 2 showing the second embodiment of the present invention, Fig. 13 is a view corresponding to Fig. 9 of the same, and Fig. 14 is a partially enlarged view of the jib hanging state showing the third embodiment of the present invention. A side view, FIG. 15 is an enlarged sectional view taken along the Y-Y line in FIG. 14,
FIG. 16 is a side view of the base end of the jib showing a fourth embodiment of the present invention, and FIG. 17 is a partially enlarged side view of the jib in a retracted state showing a conventional example. 1...Boom, 11, 12...Jib mounting shaft, 2
...Jib, 21, 22...Jib foot, 3...Auxiliary coupling, 32...Auxiliary coupling housing, 3
3... Connecting rod, 34... Connecting body of the rod, 4... Twisting guide groove, 41... Spiral groove of the guide groove, 42... Straight line groove, 6... Engaging pin,
7... Pin case, 9... Spring, R... Auxiliary rope as means for raising and lowering the jib, F... Auxiliary hook, 2
00... Auxiliary connector, 201... Hydraulic cylinder constituting the auxiliary connector, 201a... Cylinder tube as a housing, 201b... Piston rod as a connecting rod, 203... Connector,
300...Pin case.

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, and jib feet are provided on both left and right sides of the base end of the jib that are removably connected to the jib mounting shafts, and the jib is attached to this jib. The jib foot on both sides is stored on the side of the boom in a vertical position in a vertical position, the jib foot on both sides is connected to the jib mounting shaft and extends from the boom tip, and the lower side of the jib base end in the jib retracted state. is provided with an auxiliary coupling device, and the auxiliary coupling device includes a cylindrical housing fixed to the lower side of the jib, and a cylindrical housing that is rotatable around an axis substantially parallel to the lower side of the jib and movable in the axial direction with respect to the housing. With this connecting rod connected to one of the jib mounting shafts, the jib is suspended below the tip of the boom using this connection point as a fulcrum. The jib is extended to the tip of the boom through a jib twisting process in which the connecting tool is twisted around the axis of the connecting rod, and a jib lifting process in which the entire jib is pulled up after this twisting and the jib feet on both sides are engaged with the jib mounting shafts on both sides. In a crane in which the jib is stored on the side of the boom through a jib lowering process and a jib twisting process, which are opposite to the above, one member of the housing and the connecting rod of the auxiliary coupling device has a torsion guide groove, and the other member has a torsion guide groove. Engagement pins that can be engaged with and disengaged from the torsion guide grooves are provided, and the torsion guide grooves have a directionality that corresponds to the twisting direction of the jib in the jib twisting process and a circumferential angle range that corresponds to the jib twisting angle. a spiral groove extending over the
a straight groove portion having a length corresponding to the amount of lifting and lowering of the jib in the jib lifting process and the jib lowering process; A jib extension and storage device for a crane, characterized in that it is equipped with means for raising and lowering a jib to move it. 2. A pin case is provided on the member on which the engagement pin is provided, and the pin case is provided to guide the engagement pin in a slidable manner between an engagement position where the engagement pin is engaged with the torsion guide groove and a disengagement position where the engagement pin is removed from the torsion guide groove. 2. The crane jib extension and storage device according to claim 1, further comprising a spring for biasing the engagement pin toward the engagement position.