Closure fasteners – Bolts – Sliding
Patent
1986-03-03
1988-02-23
Moore, Richard E.
Closure fasteners
Bolts
Sliding
292DIG66, 292150, 292245, E05C 116
Patent
active
047266139
ABSTRACT:
A door latch bolt spring-biased to projected position and retracted by a lever or other unbalanced handle is provided with a blocker plate loosely mounted on the rear face of the bolt and held in nonblocking position by a fusible pin or other heat-sensitive element. In case of fire, when elevated temperature may weaken the biasing spring and allow the unbalanced handle to exert retracting force on the latch, the heat-sensitive element releases the blocker plate and allows it to drop to an operative position where it will move against a stop to block retraction of the bolt. The plate is movable in either direction on the bolt so as to be operative on either hand or door. The tailpiece of the latch bolt carries means for mounting a reaction plate for the biasing spring and the blocker plate is loosely received between such plate and the rear face of the latch bolt. The reaction plate can be omitted when the blocker is not used, but can be supplied at any stage of manufacture or in the field when desired.
REFERENCES:
patent: 1086126 (1914-02-01), Berry
patent: 2253547 (1941-08-01), Adams
patent: 3318123 (1967-05-01), Piazza
patent: 3705739 (1972-12-01), Adler
patent: 3811717 (1974-05-01), Floyd et al.
patent: 4183565 (1980-01-01), Allemann
patent: 4437693 (1984-03-01), Godec
patent: 4589691 (1986-05-01), Foshee et al.
Best Lock Corporation
Moore Richard E.
LandOfFree
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