Edward L Larson

US Patent:

8421640, Apr 16, 2013

Filed:

Jun 7, 2010

Appl. No.:

12/802418

Inventors:

Edward Wayne Larson - Puyallup WA, US

International Classification:

G08B 21/00

US Classification:

340685, 340673, 340679, 3406861, 3406866, 212276

Abstract:

An automatic signaling system to prevent a tractor from being accidently lifted with the cargo by a ship to shore gantry crane. The embodiment includes multiple sensors to detect a lifted condition and radio output upon a lifted condition. The radio output channel is determined by an automatic identification system that identifies the crane the tractor is under. Upon receiving a lifted signal the cranes hoist will be stopped and disabled but will still allow lowering until the lifted signal stops.