Door closer
US5572768A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1994 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Apr 13, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary friction damper in a device for connecting a door to an adjacent structure such that the door pivots about an axis during opening and closing of the same and including a torsion spring operatively connected to the door and to the structure for movement about the pivot axis to store energy during opening of the door and to release energy to provide closing during closing of the door. The rotary friction damper is operatively associated with the torsion spring and has an axis of rotation disposed substantially parallel to the pivot axis for controlling the door closing speed. The rotary friction damper is adjustable and variable. A mechanism operatively associated with the damper varies the resistance of the damper to movement of the torsion spring to produce a controlled uniform closing speed of the door and for reducing the resistance of the damper to movement of the torsion spring when the door nears the closed position to allow the torsion spring to close the door in an unrestricted manner. The mechanism for varying the resistance of the damper is responsive to movement of the torsion spring so that maximum resistance of the damper to movement of the torsion spring occur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.