Fire-rated beam with expansion relief section
USRE33501E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1988 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Aug 18, 2008 |
Classification
- Technology area (CPC —)General
Abstract
A beam for a fire-rated suspended ceiling structure wherein the beam has an inverted-T construction and includes a central web having a bulb at the top and a pair of oppositely disposed flanges at the bottom for supporting ceiling tiles, and an improved expansion relief section of the beam comprising a section of the web having a pair of spaced vertical cuts in the web and an horizontal cut extending between the upper ends of the vertical cuts to form a tab extending upwardly from the pair of flanges, the tab having an inverted triangular cut-out portion the apex thereof adjacent the pair of flanges and dividing the tab into two portions, a pair of protuberances formed in the upper edge of the tab portion contacting the upper portion of the web, and a section of the bulb having a crushed portion opposite the apex of the triangular cut-out portion, the crushed portion of the bulb having a substantially Z-shaped configuration whereby when the beam is subjected to expansion forces accompanying fire conditions the Z-shaped configuration of the crushed portion of the bulb is compressed along the axis of the beam and the vertical cuts on the tab portion cooperate with the opposed section…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.