Bolt closure maintenance for fire-degraded latching assembly
US5782509A · kind A · utility
18Cited by
32References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1997 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Feb 18, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/702
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a door closure assembly, the combination comprising a latch bolt element; carrier structure to carry the bolt element to pivot between door unlatched and latched position; and means carried by a fire resistant portion of the assembly to be responsive to an increase in temperature to a level T to move into position to block door unlatching movement of the bolt element from door latching position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.