Abstract: In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a deadbolt, and has a spindle coupling ring sleeved co-rotatably thereon, and a rotary seat sleeved rotatably thereon. The rotary seat has a clutch portion surrounded by a stationary seat and provided with angularly displaced resilient locking units that normally engage the stationary seat, and is disengaged from the stationary seat to permit operation of the rotary knob to rotate the spindle. An electric driving motor has a transmission shaft coupled to the rotary seat. The locking units are disengaged from the stationary seat and engage the spindle coupling ring when the motor is operated to rotate the rotary seat, thereby resulting in co-rotation of the spindle. The locking units include ball members which move rollingly out of locking grooves in the stationary seat when the rotary seat is rotated.

Abstract: In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a deadbolt, and has a spindle coupling ring sleeved co-rotatably thereon, and a rotary seat sleeved rotatably thereon. The rotary seat has a clutch portion surrounded by a stationary seat and provided with angularly displaced resilient locking units that normally engage the stationary seat, and is disengaged from the stationary seat to permit operation of the rotary knob to rotate the spindle. An electric driving motor has a transmission shaft coupled to the rotary seat. The locking units are disengaged from the stationary seat and engage the spindle coupling ring when the motor is operated to rotate the rotary seat, thereby resulting in co-rotation of the spindle. The locking units include ball members which move rollingly out of locking grooves in the stationary seat when the rotary seat is rotated.

Abstract: In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a dead bolt, and has a spindle coupling plate sleeved non-rotatably thereon, and a gear plate unit sleeved rotatably thereon. The spindle coupling plate is provided with a ball member which is biased to project from the spindle coupling plate and engage one of a plurality of angularly displaced ball recesses formed in the gear plate unit. An electric driving motor has a transmission shaft engaging the gear plate unit. The ball member disengages the spindle coupling plate from the gear plate unit when the rotary knob is operated to rotate the spindle and the spindle coupling plate. The motor is operable to rotate the gear plate unit which rotates the spindle coupling plate by virtue of the engagement between the ball member and the ball recesses, thereby resulting in co-rotation of the spindle.

Abstract: In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a deadbolt, and has a spindle coupling ring sleeved co-rotatably thereon, and a rotary seat sleeved rotatably thereon. The rotary seat has a clutch portion which is surrounded by a stationary seat and which is provided with angularly displaced resilient locking units that normally engage the stationary seat, and is disengaged from the stationary seat to permit operation of the rotary knob to rotate the spindle. An electric driving motor has a transmission shaft coupled to the rotary seat. The locking units are disengaged from the stationary seat and engage the spindle coupling ring when the motor is operated to rotate the rotary seat, thereby resulting in co-rotation of the spindle.