Safety device for a tool powered by an electric motor

Details Safety device for a tool powered by an electric motor Safety device for a tool powered by an electric motor

1987-08-12

1989-07-11

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 86, 361240, 361242, 361 33, 318434, 318450, 318463, 307120, H02H 7093

Patent

active

048477214

ABSTRACT:
A safety device for a tool powered by an electric motor. It has a main switch, electronic controls, and a tachometer-generator. In order to provide a device for switching off a motor as a function of motor speed that is simple and economical and that will retain the same nominal switch-off value for the total life of the device, a relay is wired in parallel with the motor and controls the supply of power to the motor through a relay contact.

REFERENCES:
patent: 3284668 (1966-11-01), Heaslip
patent: 3575636 (1971-04-01), Etienne
patent: 3958164 (1976-05-01), Hess
patent: 4161681 (1979-07-01), Rathje
patent: 4196462 (1980-04-01), Pohl
patent: 4412158 (1983-10-01), Jefferson et al.
patent: 4739435 (1988-04-01), Nothofer

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