US 4,511,166 A · 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 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.

A handle-operated door lock, comprising:

(a) a housing structure having front and rear faces connected by opposed sides, with the front and rear faces each having an opening formed therethrough, and with the openings being aligned along a common axis;
(b) a pair of hook-shaped rotary latch bolts each projecting from a separate one of the opposed sides of the housing structure;
(c) inner and outer rotary handles each located near a separate one of the front and rear faces of the housing structure and each having a shaft portion that extends through an associated one of the openings and along the common axis;
(d) connection means carried within the housing structure and extending along the common axis for coupling the shaft portions of the rotary handles with the rotary latch bolts, and for cooperating with the housing structure for mounting the shaft portions of the handles for rotation about the common axis such that either of the handles may be rotated about the common axis independently of the other handle to selectively rotate either of the bolts from latched to unlatched positions;
(e) biasing means carried within the housing for biasing the rotary latch bolts toward their latched positions;
(f) latch operator means supported by the housing structure for sliding movement toward and away from the common axis between a locked position wherein the latch operator means functions to prevent the outer handle form rotating either of the bolts, and an unlocked position wherein the latch operator means does not interfere with rotation of either of the handles or with rotation of either of the bolts about the common axis;
(g) latch-operator override means connected to the housing and being movably mounted relative to the housing for moving the latch operator means to its unlocked position in response to rotation of the inner handle so that the latch-operator override means assures that the latch operator means cannot prevent inner handle rotation about the common axis, and the inner handle can, at all times, be operated to rotate either of the bolts about the common axis from its latched position to its unlatched position;
(h) the housing structure including a pair of metal plates, one of the plates having opposed side walls defining opposite sides of a chamber located between the plates, the side walls each having at least one tab-like projection extending therefrom, the other of the plates having formations configured to receive the tab-like projections in interfitting engagement, the tab-like projections being bent into interfitting engagement with the formations during assembly of the housing structure;
(i) the connection means including a pair of rotary tumblers journaled within the housing structure for rotation about the common axis, each of the tumblers being drivingly connected to a separate one of the inner and outer rotary handles;
and,
(j) the latch-operator means being engageable with at least one of the rotary tumblers when the latch operator is in its locked position.

8 more elements

Handle-operated door lock with latch-operator override

Life of this patent

Handle-operated door lock with latch-operator override

Life of this patent

Abstract

Claims10