Derrick crane

Details Derrick crane Derrick crane

2005-02-17

2008-10-28

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Adjustable to transport or nonuse position

Collapsible or foldable boom

C212S239000, C212S262000

Reexamination Certificate

active

07441670

ABSTRACT:
The invention relates to a derrick crane having a main boom and having a derrick boom which are connected to one another by a stay cable to guy the main boom, having an auxiliary tip adjoining the main boom and a stay cable for its guying. In accordance with the invention, the stay cable of the auxiliary tip engages at the auxiliary tip at the one end and at the stay cable of the main boom at the other end.

REFERENCES:
patent: 2443306 (1948-06-01), De Cuir
patent: 3072265 (1963-01-01), Nickles
patent: 3209920 (1965-10-01), De Cuir
patent: 3252585 (1966-05-01), Wieschel
patent: 4159776 (1979-07-01), Holter
patent: 4194638 (1980-03-01), Morrow et al.
patent: 4381060 (1983-04-01), Morrow et al.
patent: 4446976 (1984-05-01), Imerman et al.
patent: 4557390 (1985-12-01), Mick
patent: 3640068 (1987-07-01), None
patent: 29624267 (2001-06-01), None
patent: 20108816 (2002-07-01), None

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