Interlocking cross tee
US4827681A · kind A · utility
23Cited by
17References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Sep 8, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B9/122
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fire-resistant suspended ceiling grid structure having cross tees and main beams, to support ceiling tiles. The structure has shear means to permit a cross tee to expand into a main beam during a fire. The shear means have a notch behind a transverse tab formed in the cross tee which acts as a stop against the main beam in normal conditions, and shears or bends during a fire to permit the cross tee to expand into the main beam and still hold the tile in place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.