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US 5,427,420 AGranted
Latchbolt assembly, with fusibly-actuated deadlocking
AssigneeSchlage Lock Company LLC
InventorWalter G. Moore
Life of this patent
Estimating the term…
Abstract
A link, used to allow retraction of the latchbolt against the bias of a spring, is formed of a fusible material to insure that, in the presence of intense heat, the link will melt and will no longer override a deadlocking pawl to allow the latchbolt to be withdrawn.
Claims8
A latchbolt assembly for a door in a door jamb comprising:
- a substantially cylindrical housing with a faceplate mounted thereon;
- a latchbolt slidably engaged with said housing and extendible therefrom through said faceplate;
- a plunger extendible through said faceplate adjacent said latchbolt and operably engaged with means, within said housing, for preventing prying of said latchbolt when the door is closed in the door jamb;
- means for biasing said latchbolt and said plunger to an extended position from said housing;
- and
- linkage means, within said housing and coupled to said latchbolt, for overriding said means for preventing prying of said latchbolt when said latchbolt is being retracted by operation of a door knob spindle, wherein said linkage means is fusible.
3 more elements
Dependencies are inferred from the claim text.