Hammer protection circuit

Details Hammer protection circuit Hammer protection circuit

1976-06-28

1978-01-31

Duggan, Donovan F.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 57, 361100, 361104, H02H 308

Patent

active

040718743

ABSTRACT:
A hammer protection circuit automatically disconnects a power supply from a hammer actuating coil in order to inhibit current flow through the coil when such current flow is either greater than a predetermined level or present for greater than a predetermined time period. The circuit comprises charging means coupled to the coil for charging up to a voltage level proportional to the level and duration of the current flow through the coil, comparator means coupled to the charging means for comparing the voltage level with a reference voltage and for generating an output signal when the voltage level bears a predetermined relationship toward the reference voltage, and means coupled to the comparator means and to the power supply and responsive to the output signal for disconnecting the power supply from the coil.

REFERENCES:
patent: 3359434 (1967-12-01), Galluzzi
patent: 3376478 (1968-04-01), Sheng et al.
patent: 3480834 (1969-11-01), Billings
patent: 3512044 (1970-05-01), Jones
patent: 3748537 (1973-07-01), Vigini
patent: 3819986 (1974-06-01), Fukuoka
patent: 3909681 (1975-09-01), Campari et al.
patent: 3912982 (1975-10-01), Fasulkey

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