Disconnect and overload bypass arrangement for a portable tool

Details Disconnect and overload bypass arrangement for a portable tool Disconnect and overload bypass arrangement for a portable tool

1979-07-25

1981-12-15

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

310 68C, 318345G, 318334, 318783, 361 26, 361 32, 361 58, H02H 7085

Patent

active

043062644

ABSTRACT:
The invention is directed to a disconnect and overload bypass arrangement for a hand-held portable tool equipped with an electric motor supplied from a source of electrical energy and a manually operable on-off switch for switching the tool on and off. The arrangement includes a self-reclosing disconnect switch operatively connected to the motor to temporarily disconnect the same from the energy source in response to an overload condition; and, circuit control means for supplying energy to the motor at a reduced level when the disconnect switch is open whereby the motor will continue to operate at reduced torque pending self-reclosure of the disconnect switch and thereby provide the operator of the tool with an audible and visual indication that the motor has not been deactivated by manually actuating the on-off switch.

REFERENCES:
patent: 1830578 (1931-11-01), Vaughan
patent: 2056040 (1936-09-01), Dozler
patent: 2514012 (1950-07-01), Rypinski
patent: 3225280 (1965-12-01), Happe et al.
patent: 3292069 (1966-12-01), Evans, Jr.

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