Control system for hole cutting machines

Details Control system for hole cutting machines Control system for hole cutting machines

1991-06-24

1992-06-30

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 31, 307119, 307142, B23B 4502, H01H 3514

Patent

active

051266431

ABSTRACT:
A control system for an electric-motor-driven power tool, comprising solenoid operated switching contacts in a mains supply circuit for controlling the supply of mains current to the motor, a latching circuit for normally holding said switching contacts closed during normal operation, a stop switch for breaking the latching circuit to open said switching contacts when it is desired to stop the motor in normal operation, and a reed relay having switching contacts disposed in the latching circuit and a coil disposed in the mains supply circuit to the motor. The reed relay is arranged to break the latching circuit automatically, and thereby disable the motor, if the current supply to the motor exceeds a predetermined level. A movement detection device is adapted to trigger the latching circuit to open the solenoid operated switching contacts in the event of the control system being physically moved in operation.

REFERENCES:
patent: 4013895 (1977-03-01), Akiyoshi et al.
patent: 4105899 (1978-08-01), Velosa
patent: 4208555 (1980-06-01), Ikeda et al.
patent: 5035547 (1991-07-01), Shoji

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