Lockset with motorized system for locking and unlocking

PCT No. PCT/US97/12586 Sec. 371 Date Jan. 11, 1999 Sec. 102(e) Date Jan. 11, 1999 PCT Filed Jul. 14, 1997 PCT Pub. No. WO98/02630 PCT Pub. Date Jan. 22, 1998A door lock (1), preferably operable both by a mechanical key (C) with a key cylinder (60) and by an electronic signal and having inside and outside handles (A, B) mounted on inside and outside hollow spindles (10, 50), for mounting on a door having an inside face and an outside face, has a cylindrical lock chassis (80) with a provision for retracting a latch bolt (4) in response to rotation of either of the hollow spindles (10, 50); a member (40) for selectively locking the outside spindle (50) against rotation; a reversible electric motor (20) mounted coaxially within the inside spindle (10), the motor being secured against rotation but free to slide axially against resistance provided by a biasing member (21), and having a motor shaft (31) extending through the cylindrical lock chassis (80) to operably engage the member (40) for locking the outside spindle (50); a power supply (101) for the motor (20); and a mechanism (42, 45, 61) for selectively moving the member (40) between locked and unlocked positions.