Counterbalanced door assembly with reduced initial closing force
US5205073A · kind A · utility
Inventor
Key dates
| Filing date | Oct 1, 1992 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Oct 1, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2999/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door closing mechanism, preferably mounted on a counterbalanced door assembly, which provides a mechanical advantage to close the door and overcome the forces of friction, inertia and any counterbalancing forces. A slot plate with a curved control slot is mounted to the door. A control arm, pivotally mounted at one end to the door frame, has a handle and slot engager mounted at the other end. The slot engager slides along the control slot and pulls the door closed as the handle is pulled. The control slot is preferably curved only along a first portion and straight in a second portion to provide greater mechanical advantage at the beginning of its motion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.