Device for placing a tower crane in weathervaning mode

Details Device for placing a tower crane in weathervaning mode Device for placing a tower crane in weathervaning mode

2009-05-13

2011-12-13

Brahan, Thomas J (Department: 3654)

Traversing hoists

Boom position lock

C212S247000

Reexamination Certificate

active

08074816

ABSTRACT:
The crane includes a rotating part composed of a jib and of a counterjib, and a mechanism for slewing the rotating part that has at least one geared motor unit with a motor and reduction gear, and an internal main brake which is deactivated when the crane is placed out of service, in order to allow the rotating part to slew freely according to the direction of the wind. The geared motor unit also includes an internal auxiliary brake which is interposed between the motor and the reduction gear and which is activated when the crane is placed out of service in order to exert on the rotating part a braking torque which avoids uncontrolled rotation of said part when placed in weathervaning mode. The auxiliary brake can be designed to exert an adjustable braking torque.

REFERENCES:
patent: 3763968 (1973-10-01), Noly
patent: 4588057 (1986-05-01), Weich et al.
patent: 6010018 (2000-01-01), Pech
patent: 6772863 (2004-08-01), Jessen et al.
patent: 7357132 (2008-04-01), Hayden
patent: 783205 (1980-11-01), None

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