Jib crane
AssigneeIshikawajima Transport Machinery Co., Ltd.
InventorsDaisuke Omori, Isao Miyazawa, Toshinori Fukumoto, Seikichi Tanaka
Life of this patent
Estimating the term…
Abstract
A jib crane is provided which can prevent an unexpected movement of a burden and can sufficiently ensure the safety of a burden handling work. The jib crane has hoisting wire ropes 22 for lifting up and down of a hook 34, derricking wire ropes 24 for derricking operation of a jib 14 and a conversion device 38 for fixing tips of the wire ropes 22 and 24 to a revolving frame 58 of a revolving table. The conversion device 38 has a V-shaped link 62 pivotally supported on a bearing bracket 56 via a pivot pin 60. The tips of the wire ropes 22 and 24 are connected to paired link arms 62a and 62b of the link 62.
Claims4
In a jib crane comprising
- a jib pivoted to a revolving table for derricking motion,
- a hoisting device having a hoisting drum on said revolving table with hoisting wire ropes being wound around the hoisting drum, a hanger being suspended by the hoisting wire ropes unreeled from the hoisting drum via a tip of the jib while tips of the hoisting wire ropes are fixed to said revolving table, said hanger being lifted up and down by reeling and unreeling said hoisting wire ropes to and from said hoisting drum, and
- a derricking device having a derricking drum on said revolving table with derricking wire ropes being wound around the derricking drum, said jib being suspended by the derricking wire ropes unreeled from the derricking drum while tips of said derricking wire ropes are fixed to said revolving table, said jib being derricked by lead-in and pull-out of said derricking wire ropes to and from said derricking drum,
- the jib crane which comprises a conversion device on said revolving table for converting load applied to said hoisting wire ropes into lead-in of said lead-in wire ropes during a burden handling work.
Dependencies are inferred from the claim text.