Fire-rated runner

Details Fire-rated runner Fire-rated runner

Filed on

1992-04-06

Date issued

1994-05-24

Examiner

Friedman, Carl D.

Patent Class

Static structures (e.g., buildings)

SubClass

Irreversibly reactive component

Other Related Categories

525731, 52DIG5, 5250607, E04B 908

Type

Patent

Status

active

Patent number

053137507

Description

ABSTRACT:
The grid member is formed of sheet metal and has an inverted T-shape with a bulb at the top, a double thickness central web and oppositely disposed flanges at the bottom. To achieve controlled expansion, an extended angular lance is cut at the top of the bulb. No metal is removed at this area of maximum bending stress. Further, staggered cutouts are placed in the two thicknesses which make up the web. By staggering the cutout areas of adjacent web layers, the overall web strength is maintained. These web cutouts and the lance at the top of the bulb cooperate upon thermal expansion, causing the bottom flanges to buckle down, and the web and bulb to separate laterally and fold. The folded web configuration directed by the staggered cutout pattern will maintain longitudinal rigidity.

REFERENCES:
patent: 3189139 (1965-06-01), Znamirowski
patent: 3778947 (1973-12-01), Sauer
patent: 4713919 (1987-12-01), Platt

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