Door opening/closing apparatus
US5634297A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1994 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Dec 30, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door opening/closing apparatus, which can cause quick and smooth start of movement of a sliding door in an emergency, without any possibility of breakage of the door due to quick movement, so that it can be used reliably and safely. When an operating member is released from its lock, it is pulled along with the sliding door, by a uniform force. To start movement of the operating member, a pushing member mounted on a slidable member is pushed by the spring forces of two coil springs, thus aiding the operation of pushing the operating member and permitting quick and smooth start of movement of the operating member, sliding door, etc. With the screwing of an adjustment screw, the spring force of an adjustment spring is adjusted. The adjusted spring force causes a pushing member to be pushed against a guide member via a pivotal member and a pushing member to effect adjustment of the speed of movement of the operating member for braking action.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.