Apparatus for adjusting torque and speed of a dentist handpiece

Details Apparatus for adjusting torque and speed of a dentist handpiece Apparatus for adjusting torque and speed of a dentist handpiece

1987-07-02

1988-12-20

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318308, 318332, 361 57, G05B 500

Patent

active

047927356

ABSTRACT:
A D.C. motor control circuit for a dentist's hand drill including a feedback loop to vary the torque of the motor according to the load on the motor while keeping the motor speed constant. Power to the motor is provided through a three terminal regulating IC circuit. The IC regulating circuit is protected against power surges by an overload detecting circuit incorporated into the feedback loop.

REFERENCES:
patent: 3359434 (1967-12-01), Galluzzi
patent: 3396323 (1968-08-01), Auld
patent: 3725739 (1973-04-01), Gniffey
patent: 4384241 (1983-05-01), Stillhard
patent: 4494057 (1985-01-01), Hotta
patent: 4594633 (1986-06-01), Townsend et al.

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