Patent ID: 6025663
Filing Date: 2000-02-15
Classification: E05F,E05Y,H02K

Abstract:
An operating mechanism for a closure member comprising:an electric motor with an axially displaceable, rotatable rotor shaft extending from the motor at the first end thereof;a helical gearing on the rotor shaft at said first end;a brake assembly on the rotor shaft at the other end of the motor;the helical gearing on the rotor shaft engaging a mating drive gear which drives the closure member;said brake assembly compromising a brake cone concentrically mounted on the rotor shaft and adapted to engage a conical braking surface;and a spring means for biasing the rotor shaft and said brake cone when said motor is not energized such that said cone bears lightly against said conical braking surface;whereby any rotational force applied to the rotor shaft from the drive gear displaces the rotor shaft axially such that said cone is forced against said conical braking surface and rotation of rotor shaft is prevented.