Automatic resetting anti 2-block crane warning system

Details Automatic resetting anti 2-block crane warning system Automatic resetting anti 2-block crane warning system

1979-12-20

1981-11-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 47, 212152, G08B 2100

Patent

active

043001343

ABSTRACT:
An automatic resetting anti 2-BLOCK condition crane warning system gives audible and visual warning of an imminent 2-BLOCK condition and prevents occurrence of an actual 2-BLOCK condition by means of a control output signal. The warning system is further operable to permit override of the indication of and control against the 2-BLOCK condition. Three distinct audible and visual indications are provided for NORMAL, 2-BLOCK, and OVERRIDE system states. The system is further operative to automatically reset to a NORMAL state from either a 2-BLOCK or OVERRIDE state upon sensing a transition from a 2-BLOCK condition to a NORMAL condition.

REFERENCES:
patent: 3391906 (1968-07-01), Duerst
patent: 3922789 (1975-12-01), Sarrell
patent: 3969714 (1976-07-01), Greer
patent: 4178591 (1979-12-01), Geppert
patent: 4178591 (1979-12-01), Geppert
"Anti-Two-Block Warning System", Form No. 1511778-5M of Grove Mfg. Co., supplied by applicant.

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