Fire door release mechanism

Details Fire door release mechanism Fire door release mechanism

1992-10-28

1993-11-23

Purol, David M.

Flexible or portable closure, partition, or panel

Automatic control

With starting or driving means

160310, E05F 1520

Patent

active

052635279

ABSTRACT:
A fire door release mechanism includes a pair of levers engaging a bearing disc to hold a toothed clutch in engagement between a shaft of the fire door and a shaft of its operator. One of the levers has, at its end remote from the bearing disc, a pin on which a holding block is pivotally mounted. The other lever also has a pin at its remote end which is retained within a pocket on the holding block so long as tension is applied to the block, which tension is normally provided by a fuse link chain. When the tension is released, the levers, which are lightly spring biased, pivot out of engagement with the bearing disc to allow the clutch to disengage and separate the operator shaft from the fire door shaft.

REFERENCES:
patent: 1709271 (1929-04-01), McCloud et al.
patent: 2564208 (1951-08-01), Michelman
patent: 3559716 (1971-02-01), Loucks
patent: 3613765 (1971-10-01), Sivin
patent: 4147197 (1979-04-01), Bailey et al.
patent: 4664170 (1987-05-01), Labelle
patent: 5203392 (1993-04-01), Shea

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