Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-12-30
1985-07-16
Myracle, Jerry W.
Communications: electrical
Condition responsive indicating system
Specific condition
340666, G08B 2100
Patent
active
045299757
ABSTRACT:
A separate overload detecting and warning system for hydraulic jacks comprises a load sensing bypass pipe channel communicating with the high-pressure piping of the hydraulic jack, a linear load sensing unit directly connected to the load sensing bypass pipe channel for receiving the pressure signal therefrom, a warning circuit system having a multiple load-limit setting arrangement electrically coupled with the linear load sensing unit, and a power source switch mechanically connected with the release valve of the hydraulic jack and electrically connected to the warning circuit system for automatically energizing and de-energizing the warning circuit system along with the closing and opening of the release valve. When the valve is turned to the closed position for starting a load-lifting operation, the warning circuit system will be energized to effect the circuit test to automatically indicate the circuit condition and to begin detecting the pressure state of the load-lifting operation with complete assurance of safe operation.
REFERENCES:
patent: 1828022 (1931-10-01), Brand
patent: 3918037 (1975-11-01), Hall
patent: 4039084 (1977-08-01), Shinohara et al.
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