Patent ID: 6422965
Filing Date: 2002-07-23
Classification: E05F,E05Y,E06B

Abstract:
An apparatus comprising a motor driven door operator unit for moving a door between open and closed positions, said operator unit comprising:a drive motor including a motor output shaft; a speed reduction drive mechanism including a housing, a gear drive mechanism supported in said housing and operably connected to said motor output shaft and to an operator output shaft, said drive motor being operable to drive said operator unit output shaft at a reduced speed in opposite directions of rotation, said gear drive mechanism including a sun gear and at least one planet gear operably engaged with said sun gear and with a ring gear; an adjustable torque limiting clutch disposed between said ring gear and said operator unit output shaft and including means for adjusting a limit torque transferred between said operator unit output shaft and said gear drive mechanism; a brake assembly operably connected to said motor output shaft and said drive mechanism for braking rotation of said motor output shaft and said operator unit output shaft; and a release member operably connected to said ring gear and operable in a first position to lock said operator unit output shaft against rotation when said brake assembly is engaged, said release member being movable to a second position to allow rotation of said operator unit output shaft independent of said motor output shaft.