JPH0218479U

JPH0218479U -

Info

Publication number: JPH0218479U
Application number: JP9737688U
Authority: JP
Priority date: 1988-07-25
Filing date: 1988-07-25
Publication date: 1990-02-07

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す正面図、第２
図は第１図の根元シヤトルブームと先端シヤトル
ブームの関係を示す図、第３図は第１図の各ドラ
ムとワイヤー及びロープの掛け渡しの詳細を示す
斜視図、第４図は本考案における作用を説明する
ための図、第５図は第４図の―線矢視図、第
６図は第５図の他の例を示す図、第７図は従来例
を示す図である。図中、１はマスト、２は支持フレーム、３は根
元シヤトルブーム、４は先端シヤトルブーム、７
ａ，７ｂは引込用ロープ、８は引込ドラム、１５
は吊具、１６は巻上ドラム、１７は引込補正ドラ
ム、１８ａ，１８ｂは巻上ワイヤーロープ、２０
は動滑車である。 Figure 1 is a front view showing one embodiment of the present invention;
The figure is a diagram showing the relationship between the base shuttle boom and the tip shuttle boom in Figure 1, Figure 3 is a perspective view showing details of each drum in Figure 1 and the wiring of wires and ropes, and Figure 4 is a diagram showing the relationship between the base shuttle boom and the tip shuttle boom in Figure 1. FIG. 5 is a view taken along the - line arrow in FIG. 4, FIG. 6 is a view showing another example of FIG. 5, and FIG. 7 is a view showing a conventional example. In the figure, 1 is the mast, 2 is the support frame, 3 is the base shuttle boom, 4 is the tip shuttle boom, 7
a, 7b are retraction ropes, 8 is a retraction drum, 15
16 is a hoisting device, 17 is a retraction correction drum, 18a and 18b are hoisting wire ropes, 20
is a moving pulley.

Claims

[Scope of utility model registration request]

A telescopic shuttle boom is provided on the mast, a retracting rope is connected to the shuttle boom to extend and retract the boom, and a retracting drum is provided for winding or unwinding the retracting rope to make it extend and retract. In a jib crane device equipped with a hoisting drum that raises and lowers a hoist hanging from the tip of a boom via a hoisting wire rope, the hoisting device is attached to a movable pulley, and one hoisting wire rope of the movable pulley is attached to the hoisting drum. A jib crane retraction correction device, characterized in that the other hoisting wire rope is connected to a hoisting drum and wound around a retraction correction drum provided in conjunction with the retraction drum.