Rotary damper
US4691811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1986 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rotary damper comprises a cylindrical case closed at the bottom and having a housing containing a viscous liquid, a lid mounted in the case to close the housing and having a central circular hole, and a rotor having a shaft passing through the hole of the lid, a driven gear secured to its distal end and a brake plate rotatably disposed in the viscous liquid in the housing. The central circular hole has an increased diameter portion provided adjacent to the housing, and an O-ring is fitted on the shaft of the rotor and received in the increased diameter portion such that it is radially compressed by the peripheral wall of the increased diameter portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.