Safety device for an electric power tool

Details Safety device for an electric power tool Safety device for an electric power tool

1986-01-24

1988-04-19

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 86, 318463, H02H 708

Patent

active

047394358

ABSTRACT:
A safety device for an electric power tool, especially a portable tool. It has a main switch, electronic controls, a tachometer-generator, and a relay. The relay electrically parallels the motor, acts on the supply of current to the motor through a relay contact, and is activated through the tachometer-generator and through a subsequent safety circuit. To provide a means of switching off the motor at excessively high speeds that will be inexpensive to manufacture and that will maintain a constant switch-off reference speed throughout its life, the safety circuit consists of a synchronization stage, an adjustable timer stage, a processing stage, an ignition amplifier, and an output section.

REFERENCES:
patent: 3284668 (1966-11-01), Heaslip
patent: 3558978 (1971-01-01), Nye, Jr.
patent: 3575636 (1971-04-01), Nantes
patent: 4196462 (1980-04-01), Pohl
patent: 4314186 (1982-02-01), Gille et al.
patent: 4384312 (1983-05-01), Fry
patent: 4389692 (1983-06-01), Sanders et al.
patent: 4412158 (1983-10-01), Jefferson et al.
patent: 4473856 (1984-09-01), Takahashi et al.

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