Door latch
AssigneeNational Manufacturing Co.
InventorsMarlin D. Crown, James R. Johnston
Life of this patent
Estimating the term…
Abstract
The lock button on a door latch is slidable in a horizontal direction between a retracted unlocking position and an extended locking position wherein it blocks a latch hook release member from unlatching the latch, prevents inadvertent locking of the door and extends alongside a strike shoulder on the associated door jamb to provide a secondary latch.
Claims8
A door latch mechanism adapted to be mounted to one face of a swingable door for operative latching engagement with a strike assembly mounted to the associated door jamb at a position to intercept said latch mechanism upon closing movement of the door, said strike assembly including a fixed strike surface and a laterally moveable, retractable strike, said latch mechanism comprising
- a latch case having a notch adapted to receive said strike when said door is closed,
- release means carried by said case for movement toward and away from said jamb when said door is closed for pushing said strike out of latching engagement with said notch,
- a lock actuator mounted to said case for movement between a retracted, unlocked position out of engagement with said strike surface on said jamb and an extended, locked position wherein a portion thereof extends into operative, locking engagement with said strike surface, and
- blocking means connected to said lock actuator for blocking the movement of said release means toward said jamb when said lock actuator is in said extended, locked position.
A door latch mechanism adapted to be mounted to one side of a swingable door for operative latching engagement with a strike assembly mounted to the associated door jamb at a position to intercept said latch mechanism upon closing movement of the door, said strike assembly including a laterally movable, retractable strike, said latch mechanism comprising
- a casing having a latch notch adapted to receive said strike when said door is closed,
- release means pivotally carried by said casing for movement toward and away from said jamb when said door is closed for pushing said strike out of latching engagement with said latch notch,
- a lock actuator mounted to said casing for rectilinear movement between an unlocked position and a locked position,
- blocking means including a blocking member journaled in said casing for arcuate movement between a blocking position and a non-blocking position and connected to said lock actuator for blocking the movement of said release means toward said jamb only when said actuator is in said locked position,
- said blocking member being mounted in a cavity opening at the base of said casing,
- a leaf spring mounted to said casing and extending across said opening to hold said blocking member in said cavity in operative relationship with said lock actuator,
- said blocking member further includes at least one detent surface in an end thereof adjacent said opening,
- said leaf spring has a detent surface to prevent spurious movement of said blocking member, and
- said blocking member includes a protuberance offset from the axis of arcuate movement of said blocking member and extending into a recess in said lock actuator,
- said protuberance preventing disassembly of said lock actuator from said casing.
Dependencies are inferred from the claim text.