Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent
1983-01-24
1986-06-17
Blix, Trygve M.
Traversing hoists
Having vertically swinging boom
Having means to swing boom vertically
212168, 212182, 212231, 212264, 403 53, B66C 2304, B66C 2344
Patent
active
045951080
ABSTRACT:
An apparatus for stretching and folding an extension jib in a wheeled type crane including a telescopic boom, and a suspension-rod-supported compression column type extension jib to be supported in a flat posture at the fore end of the boom in stretched state through right and left jib foot portions rotatably engaged with horizontal boom point pins extending transversely of the boom at the fore end thereof, the method including the steps of (a) providing on opposite sides of the extension jib right and left jib foot portions disengageably engageable with the boom point pins, one of the jib foot portions being rotatable relative to the boom about an axis extending in the axial direction of the jib; (b) stretching the jib from a folded position in which the top and bottom sides of the jib are disposed in an upright posture along one side of the boom, by engaging the one jib foot portion with the boom point pin on the folding side and turning the boom into an inclined position from a horizontal position, rotating the jib around the axis of the boom point pin into a vertically suspended position; (c) turning the jib in the vertically suspended position through a predetermined angle about the axis extending in the axial direction of the jib to engage the other jib foot portion with the corresponding boom point pin, and stretching the jib in a flat posture; and (d) in the folding operation, folding the jib into the initial folded position by performing steps (a) to (c) in an inverse order.
REFERENCES:
patent: 2657940 (1953-11-01), Davidson
patent: 2854261 (1958-09-01), Spaide
patent: 3366250 (1968-01-01), Grove
patent: 3698569 (1972-10-01), Lamer et al.
patent: 3944082 (1976-03-01), Fritsch
patent: 4091936 (1978-05-01), Wuerflein et al.
patent: 4141455 (1979-02-01), Henderson et al.
patent: 4303165 (1981-12-01), Cassens et al.
patent: 4394914 (1983-07-01), Privat
patent: 4431109 (1984-02-01), Behrendt et al.
patent: 4453643 (1984-06-01), Thomasson
Koizumi Yukio
Miyazawa Hiroshi
Blix Trygve M.
Johnson R. B.
Kabushiki Kaisha Kobe Seiko Sho
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