Crane anti tractor lift system

Details Crane anti tractor lift system Crane anti tractor lift system

1994-07-18

1995-10-03

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

212281, 340540, 340531, G08B 2100

Patent

active

054555671

ABSTRACT:
An automatic signaling system from a tractor-trailer being accidentally lifted with the cargo by the overhead traveling crane includes a height-change sensor for triggering a pulse generator which drives a strobe light that is seen by a discriminator mounted above on the crane. The discriminator is coupled into the hoisting circuitry only and does not affect the "lowering" circuitry; it will interrupt hoisting only if the discriminator sees strobe flashes of a particular predetermined frequency and pulse duration.

REFERENCES:
patent: 3805257 (1974-04-01), Litman et al.
patent: 5260688 (1993-11-01), Curry et al.

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