Tower crane with collapsible counter-jib

Details Tower crane with collapsible counter-jib Tower crane with collapsible counter-jib

2006-08-22

2006-08-22

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Adjustable to transport or nonuse position

Crane boom supported by foldable or collapsible tower

C212S300000

Reexamination Certificate

active

07093730

ABSTRACT:
The auto-erection tower crane possesses a tie-free jib, mounted at the summit of a mast and extended, toward the rear of its connection point to the summit of the mast, by a counter-jib, the end of which is connected, by a rear tie, to a bogie truck element of the crane. For the transport of the crane, the counter-jib is folded up in a vertical plane on the rear part of the jib. The unfolding and folding-up of the counter-jib are realized automatically, simultaneously with the automatic erection or dismantling of the crane. The structure of the counter-jib also allows adjustment of the working position, horizontal or inclined, of the jib.

REFERENCES:
patent: 3357572 (1967-12-01), Yoshioka
patent: 3378147 (1968-04-01), Marrie
patent: 4596336 (1986-06-01), Zwagerman
patent: 4895263 (1990-01-01), Saint Gerand
patent: 6276541 (2001-08-01), Gevaudant
patent: 6290078 (2001-09-01), Verchere
patent: 6655539 (2003-12-01), Bertinotti
patent: 2003/0160016 (2003-08-01), Ortiz et al.
patent: 36 33 582 (1987-04-01), None
patent: 0 888 997 (1999-01-01), None
patent: 0 941 958 (1999-09-01), None
patent: 1 564 958 (1969-04-01), None
patent: 2 550 176 (1985-02-01), None
Societe POTAIN, “Erection/Dismantling manual for the “GMR 321 C” crane model,” pp. 21, 25, 48 and 51, 1989.

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