Crane spreader beam having radio-controlled load release

Details Crane spreader beam having radio-controlled load release Crane spreader beam having radio-controlled load release

2007-05-24

2010-11-23

Kramer, Dean J (Department: 3652)

Handling: hand and hoist-line implements

Spacing hoist bar or frame

Load supporting units

C294S081540, C294S082300, C294S082350, C294S905000

Reexamination Certificate

active

07837245

ABSTRACT:
A hollow crane spreader beam incorporates at least one radio-controlled load-release assemblies. Each assembly includes a slidable bolt that is coupled to the plunger of an electric-motor-driven, radio-controlled door lock unit that is installed within the beam. When in a first position, taken in response to application of first polarity voltage to the door lock motor, the bolt traps a free end of a load-supporting chain or cable between a pair of eye blocks, each having an aperture through which the bolt slides. When in a second position, taken in response to application of a second polarity voltage, the bolt releases the free end. The spreader beam also incorporates a radio receiver/controller unit and a battery that is coupled to both the radio receiver/controller unit and the multiple door lock units.

REFERENCES:
patent: 1426764 (1922-08-01), Parker
patent: 3578373 (1971-05-01), Metz
patent: 3895836 (1975-07-01), Barnes
patent: 3897097 (1975-07-01), Davis, Jr.
patent: 4109798 (1978-08-01), Comyns-Carr
patent: 4453622 (1984-06-01), Betz
patent: 5580113 (1996-12-01), Pomerville et al.
patent: 7380849 (2008-06-01), Mongan
patent: 2005/0242602 (2005-11-01), Protesto
patent: 2-188392 (1990-07-01), None
EZ-Release advertisement on p. 56 of Jul. 2005 issue of American Cranes & Transport magazine.
RIG-Release advertisement on p. 41 of Aug. 2005 issue of American Cranes & Transport magazine.

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