Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent
1990-05-10
1992-05-26
Swinehart, Edwin L.
Traversing hoists
Having vertically swinging boom
Having means to swing boom vertically
212188, 212187, B66C 2370
Patent
active
051159252
ABSTRACT:
A jib stretching and folding device including an auxiliary connector mounted on a lower surface of a jib in the vicinity of a base end portion ofo the jib in a jib folded condition. The auxiliary connector includes a cylindrical housing fixed to the lower surface of the jib and a connecting rod rotatably supported by the housing and having an axis which is substantially parellel to the lower surface of the jib. The jib is twisted about the axis of the connecting rod to effect a jib stretching or folding operation. A twist guiding groove is formed on one of the housing and the connecting rood of the auxiliary connector, and an engagement projection is provided on the other of the housing and the connecting rod to engage the twist guiding groove. When the jib is raised or lowered by a jib raising/lowering means, the engagement projection is moved in the twist guiding groove to generate a jib twisting force. Thus, the jib is automatically twisted in the jib stretching or folding operation. Accordingly, a burden of labor of an operator in stretching and folding the jib can be reduced. Further, the operation can be made continuous to thereby improve the efficiency of the jib stretching and folding operation.
REFERENCES:
patent: 3339463 (1967-09-01), Updegrove
patent: 4483447 (1984-11-01), Bernabe, Jr.
patent: 4658972 (1987-04-01), Koizumi et al.
patent: 4828124 (1989-05-01), Igg
patent: 4953724 (1990-09-01), Koizumi
patent: 4967917 (1990-11-01), Koizumi et al.
Kabushiki Kaisha Kobe Seiko Sho
Swinehart Edwin L.
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