Fire rated grid

Details Fire rated grid Fire rated grid

1975-07-23

1976-06-29

Purser, Ernest R.

Static structures (e.g., buildings)

Irreversibly reactive component

52495, 52573, 52DIG5, E04C 242, E04B 198

Patent

active

039656322

ABSTRACT:
A girder-like runner for use with fire-rated suspended ceiling structure is disclosed. The runner is provided with a bottom flange, an interrupted top bead, and a web including a diamond-shaped expansion member. A lower web portion adjacent the flange is formed with two opposed lipped ledges. Buckling forces caused by first-induced thermal expansion force the web expansion member to deform outwardly into a foreshortened diamond shape. The forces also cause the ledge web portion and the flange downwardly in a controlled, predetermined manner which retains runner strength.

REFERENCES:
patent: 3169614 (1965-02-01), McCoy
patent: 3333378 (1967-08-01), Jahn et al.
patent: 3378976 (1968-04-01), Meredith
patent: 3388519 (1968-06-01), Downing
patent: 3397501 (1968-08-01), Jahn
patent: 3589089 (1969-10-01), Kedel
patent: 3778947 (1973-12-01), Sauer
patent: 3846031 (1974-11-01), Adams

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