Hold and release mechanism for a fire door spring tension adjust

Details Hold and release mechanism for a fire door spring tension adjust Hold and release mechanism for a fire door spring tension adjust

1992-09-29

1993-10-19

Purol, David M.

Flexible or portable closure, partition, or panel

Automatic control

With starting or driving means

160 9, 160315, E05F 1520

Patent

active

052536939

ABSTRACT:
A hold and release mechanism for a fire door spring tension adjusting wheel includes a finger which is retractable when the adjusting wheel is rotated in a direction to increase the tension of the door spring but remains in engagement with a notch on the periphery of the adjusting wheel to prevent rotation of the adjusting wheel in the other direction as urged by the spring tension. The finger is held within a bore in a block which is pivotably mounted to the plate supporting the adjusting wheel. A toggle arrangement coupled to the holding chain and the block keeps the finger engaged in the notch. When tension on the holding chain is released, the block is allowed to pivot so that the finger disengages from the adjusting wheel, which is then allowed to rotate under the urging of the fire door spring. This arrangement permits an operator to adjust the spring tension without requiring that the tension applied by the holding chain be relieved.

REFERENCES:
patent: 1089347 (1914-03-01), Rush
patent: 1118033 (1914-11-01), McCloud
patent: 1204738 (1916-11-01), Brunst et al.
patent: 1272347 (1918-07-01), Brunst
patent: 1795390 (1931-03-01), Graystone
patent: 2696250 (1954-12-01), Michelman
patent: 2969932 (1961-01-01), Becker
patent: 4147197 (1979-04-01), Bailey et al.
patent: 4583706 (1986-04-01), Whitehouse et al.

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