Handle-operated door lock with latch-operator override

Details Handle-operated door lock with latch-operator override Handle-operated door lock with latch-operator override

E - Fixed Constructions

05

C

292/19, 292/32

E05C 9/00 (2006.01)

Patent

CA 1208254

HANDLE-OPERATED DOOR LOCK WITH LATCH-OPERATOR OVERRIDE Abstract A handle-operated lock for use on a sliding door has hook-shaped, rotary latch bolts which project from opposite sides of a housing for selectively engaging spaced strikes to selectively retain the sliding door in open or closed positions. A compression coil spring is carried within the housing for biasing the latch bolts toward their latched positions. Inside and outside rotary handles are provided for selectively rotating the latch bolts to unlatch them in opposition to the action of the spring. Inner and outer rotary tumblers are provided within the housing to drivingly connect the rotary handles with the rotary latch bolts. A slidable latch-operator is provided near the inside handle for movement between a locked position wherein it prevents rotation of the outer tumbler to disable the outside handle from operating either of the bolts, and an unlocked position wherein it permits the outside handle to operate the latch bolts. A latch-operator override mechanism is provided for moving the latch-operator to its unlocked position when the inside handle is operated at a time when the latch-operator is in its locked position. The lock housing is formed from a pair of stamped metal plates which are interconnected both by spot welds and by a plurality of tabs which project from one of the plates and extend into interfitting engagement within recess formations provided on the other of the plates. Portions of the recess formations are utilized to position the spring properly between portions of the latch bolts, and to guide the movement of the latch operator between its locked and unlocked positions. The handles have independently rotatable shafts which extend along a common axis. The tumblers and the lock bolts also rotate about the common axis and cooperate to provide a rugged, tamper-resistant assembly.

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