Apparatus for carrying a load

Details Apparatus for carrying a load Apparatus for carrying a load

2011-02-15

2011-02-15

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Traveling bridge

Having plural trolleys

C472S080000

Reexamination Certificate

active

07886920

ABSTRACT:
An apparatus for use in carrying a load particularly in theatrical performances comprising a supported guide rail, with a first and second carriage movably mounted on the guide rail, the first carriage being adapted to carry a movable lift line for carrying the load, and a compensator system linking the first and second carriage and being arranged such that on movement of the first carriage or the second carriage, the other carriage moves in the same direction and the second carriage moves a shorter distance than the first carriage. Lifting and lowering of the load may be achieved independently of travel along the rail and a load may be transported at a constant height.

REFERENCES:
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patent: 2954879 (1960-10-01), McLean
patent: 3476385 (1969-11-01), Foy
patent: 3575300 (1971-04-01), Durand
patent: 3834552 (1974-09-01), Lofink
patent: 4363411 (1982-12-01), Blair et al.
patent: 4392648 (1983-07-01), Foy
patent: 5147051 (1992-09-01), Liljedahl
patent: 5492236 (1996-02-01), Foy
patent: 89 00 981.9 (1990-03-01), None
European Search Report for EP 08 01 8040 dated Jan. 5, 2009.

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