Electromagnetic percussion appliance

Details Electromagnetic percussion appliance Electromagnetic percussion appliance

1977-06-28

1980-07-29

Duggan, Donovan F.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

310 30, 318114, 318132, H02K 3300

Patent

active

042152976

ABSTRACT:
An electromagnetic hammer has a coil coacting with an axially reciprocable armature including a ferromagnetic core traversed by an elongate nonmagnetic ram which carries at one end a spring-loaded piston head forming part of a pneumatic damping device, its other end co-operating with a working tool. The coil is intermittently energizable by a control system including a capacitor chargeable from an electric power supply by way of a first thyristor and dischargeable through the coil by way of a second thyristor, the two thyristors being sequentially triggered in response to a control pulse applied to a transformer with two secondaries generating staggered firing pulses with the aid of a delay network in the output circuit of one of these secondaries.

REFERENCES:
patent: 773120 (1904-10-01), Christmas
patent: 1431808 (1922-10-01), Jackson
patent: 1583583 (1926-05-01), Dominguez
patent: 1723607 (1929-08-01), Dominguez
patent: 1753454 (1930-04-01), Weyandt
patent: 3147419 (1964-09-01), Cope
patent: 3345546 (1967-10-01), Beltramo
patent: 3377541 (1968-04-01), Farkas
patent: 3400316 (1968-09-01), Kuschel
patent: 3681629 (1972-08-01), Drye
patent: 3766455 (1973-10-01), Zakrewsky
patent: 3971969 (1976-07-01), Wines et al.
patent: 4069444 (1978-01-01), Heim

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