Sensing edgeswitch for a door
US5023411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1990 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Oct 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2009/0083
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A redundant sensing edge for a door causes a closing door to open by actuating a device upon force being applied to the sensing edge. The sensing edge includes a flexible air-impervious elongate outer sheath which is compressible upon application of external pressure. A substantially sealed air-impervious first chamber is positioned within the elongate sheath. A pressure-sensitive switch is in fluid communication with the first chamber for sensing pressure change within the chamber, such that upon application of external pressure to the sheath, the pressure switch is actuated. A second chamber is positioned within the sheath proximate the first chamber. A switch is positioned within the second chamber and includes a first generally cylindrical layer of resiliently compressible material, a first generally cylindrical layer of electrically conductive material, a generally cylindrical layer of non-conductive material, a second generally cylindrical layer of electrically conductive material, a second generally cylindrical layer of resiliently compressible material and a generally cylindrical support member layered in the recited order. Upon application of external pressure to the sheat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.