Closure fasteners – Bolts – Emergency operating means
Patent
1988-05-09
1989-09-12
Smith, Gary L.
Closure fasteners
Bolts
Emergency operating means
292153, 292DIG66, 49 1, 49 7, F05B 6510, F05B 1520
Patent
active
048653675
ABSTRACT:
A door lock structure includes a frame and a latch bolt carried by the frame for movement between retracted and advanced positions relative to a jamb. The bolt in its retracted position allows the door to open and when its in its advanced position blocks the closed door from opening. A first heat-fusible spring carried by the frame urges the bolt toward the advanced position. A lever pivotally carried by the bolt pivots between a first bolt blocking position and a second bolt freeing position. The lever has a second heat fusible spring carried by the bolt and acting on the lever for urging the lever toward the first bolt blocking position. The frame carries an actuator for pivoting the lever into the second position allowing movement of the bolt toward the retracted position. The lever also has a counterweight on the lever for keeping the lever in the first position to block retraction of the bolt in the event that the first and second springs melt.
REFERENCES:
patent: 2772905 (1956-12-01), Dusing
patent: 3659885 (1972-05-01), Nail
patent: 3705739 (1972-12-01), Adler
patent: 3811717 (1974-05-01), Floyd et al.
patent: 4003593 (1977-01-01), Wilzig et al.
patent: 4003614 (1977-01-01), Geer et al.
patent: 4007954 (1977-02-01), Erickson
patent: 4012066 (1977-03-01), Savatore
patent: 4130306 (1978-12-01), Brkic
patent: 4145900 (1979-03-01), Ohno
patent: 4183565 (1980-01-01), Allemann
patent: 4311329 (1982-01-01), Kral
patent: 4458928 (1984-07-01), Hirschbein
patent: 4510779 (1985-04-01), Ahad
patent: 4726613 (1988-02-01), Foshee
Adams Rite Manufacturing Company
Haefliger William W.
Nicholson Eric K.
Smith Gary L.
LandOfFree
Safety door with counterweight locking does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Safety door with counterweight locking, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety door with counterweight locking will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-911102