Fire door operator having an integrated electronically controlled descent device
US6014307A · kind A · utility
66Cited by
13References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Mar 24, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/885
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fire door opener and method of electronically controlling the door descent speed is described. The operator includes a DC brake solenoid coupled to an AC motor drive system with an inline gear reducer and an electronically controlled descent device with battery backup power. If the brake is disengaged, the door will drop by overcoming the internal inertia and friction in the inline gear reducer. Speed of descent is controlled electronically by measuring the descent speed of the fire door at its limit shaft and electrically modulating the brake engagement using the DC solenoid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.