winding and anti-drop assembly for door counterbalance system
US7254868B2 · kind B2 · utility
25Cited by
72References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2004 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Jun 18, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/106
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A counterbalance system (25) for a door (D) movable between a closed position and an open position having an axle (20), a cable drum (15) attached to the axle, a winding shaft (35) interconnected with the axle by a counterbalance spring (26), and a pawl (70) selectively movable between a first position for adjusting tension in the counterbalance spring and a second position for preventing rotation of the cable drum upon failure of the counterbalance spring, thereby limiting movement of the door toward the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.