Door positioning system
US5377448A · kind A · utility
9Cited by
7References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Jan 21, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door positioning mechanism with a moveable carriage driven by a motor through a lead screw, wherein the moveable carriage is connected to open and close the door by movement of the door rectilinearly along a track through the expedient of a drive train utilizing a multiple sheave and cable connection between the door and the moveable carriage. A hand disconnect is provided to disable the positioning mechanism and allow manual movement of the door. A thermal (fire switch) dead weight control is also provided to over-ride the positioning mechanism and automatically shut the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.