Door closing apparatus
US4103392A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1976 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Oct 26, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for automatically closing a door with respect to a fixed support adjacent thereto which includes a torsional spring, a one-way clutch mechanism and a swash plate hydraulic damper concealably retained within a compact housing. The housing is secured to either the door or the fixed support and a first rotatable portion of the one-way clutch is coupled to the other of either of the door or fixed support so that the first rotatable portion rotates in a first direction when the door is opened in the opposite direction when the door is closed. The torsional spring is at least partially disposed about the one-way clutch mechanism and has one end anchored to the housing and the other end secured for movement with the first rotatable portion. As the door is opened, the first rotatable portion is rotated in the first direction to wind up the torsional spring. When the door is released, the torsional spring unwinds to reverse the process and close the door. As the torsional spring unwinds, the first rotatable portion is driven in the opposite direction causing the one-way clutch mechanism to drive a second rotatable portion in the opposite direction as well. The swash plate hydra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.