Fire-blocking door lock structure

Details Fire-blocking door lock structure Fire-blocking door lock structure

2006-07-04

2006-07-04

Estremsky, Gary (Department: 3676)

Closure fasteners

Bolts

Emergency operating means

C292S092000, C292SDIG065

Reexamination Certificate

active

07070210

ABSTRACT:
A fire-blocking door lock structure includes a latching member mounted on a fire-blocking door lock and an actuation mechanism mounted in the latching member. The actuation mechanism includes a latch body having a stop portion; a stop piece which prevents retraction of the latch body and is connected to a fire-blocking piece; a safety latching member which prevents the latch body from retraction into the latching member when the safety latching member abuts against the stop piece; a guide rod for allowing the latch body to be blocked by the fire-blocking piece when the safety latching member abuts against the stop piece; and an actuating piece. When the fire-blocking piece melts under a high temperature during a fire, the stop piece blocks the stop portion, such that the latch body cannot be retracted into the latching member, keeping the fire-blocking door locked.

REFERENCES:
patent: 4598939 (1986-07-01), Krupicka et al.
patent: 4709950 (1987-12-01), Zortman
patent: 4747629 (1988-05-01), Miller
patent: 4824150 (1989-04-01), Smith et al.
patent: 5890752 (1999-04-01), Lin
patent: 6205825 (2001-03-01), Haeck et al.

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