Apparatus and method improving safety in the operation of a...

Details Apparatus and method improving safety in the operation of a... Apparatus and method improving safety in the operation of a...

2005-01-04

2005-01-04

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S435000, C340S870030

Reexamination Certificate

active

06838996

ABSTRACT:
The invention is an apparatus and method for improved safety in operation of a crane relative to the transit of a load overhead of workmen. A initiating operator transmits a RF signal to sound a first horn alarm when a lift commences. The initiating operator transmits a second RF signal, when the transit of the load commences, to sound a second horn alarm which operates asynchronously relative to the first horn alarm. A terminating operator disengages the horn alarms when the load is placed. Workmen will hear a Doppler effect as indicative of the direction of travel and position of the load.

REFERENCES:
patent: 5343739 (1994-09-01), Curry
patent: 5924651 (1999-07-01), Penza et al.
patent: 6140930 (2000-10-01), Shaw
patent: 6208260 (2001-03-01), West et al.
patent: 6476763 (2002-11-01), Allen, Jr.
patent: 6480098 (2002-11-01), Flick
patent: 6614721 (2003-09-01), Bokhour

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