Patent US4574423A successfully refreshed from Google Patents.
US4574423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary damper having a clutch spring and viscous fluid
Assignee: Fuji Seiki KK
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Filing: 1984-02-06
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Granted: 1986-03-11
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Expires: 2004-02-06
Abstract
Abstract A rotary damper with a directional property is disclosed which is capable of being simplified in structure, manufactured with a low cost, and stably and precisely operated. The rotary damper is constructed in such a manner that a clutch spring is interposed between a revolving shaft and a rotor to selectively carry out the integral rotation of the rotor with the shaft or the stop of the rotor independent from the shaft.
Inventors
- 👤 Kenji Ito
- 👤 Masanori Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:10
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/14; F; F16; F16F; F16F9/00; F16F9/10; F16F9/12; G; G11; G11B; G11B15/00; G11B15/675; G11B15/67502; G11B15/67507; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/21; E05Y2201/252; E05Y2201/254; E05Y2201/262; E05Y2201/266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A rotary damper with a directional property, comprising: a housing having a bottom; a rotor rotatably received in said housing, said rotor having a circular recess formed on the upper surface thereof; a viscous liquid interposed between the bottom of said housing and the lower surface of said rotor to apply a viscous resistance to said rotor; a revolving shaft having a part thereof rotatably inserted in said recess of said rotor; clutch means in the form of a coil spring fitted on said part of said revolving shaft in a manner to be interposed between said rotor and said revolving shaft through said recess and form a frictional contact with said revolving shaft; a cutout formed in said part of said revolving shaft opposite to the upper end of said recess and having one end of said clutch spring securely supported therein; and friction means comprising a rubber ring interposed between and mutually engaging an annular recess formed at the lower portion of the outer periphery of said rotor and the bottom of said housing.
Claim 2
Dependent Claim
176 words
A rotary damper with a directional property, comprising: a housing having a bottom; a rotor rotatably received in said housing, said rotor having a circular recess formed on the upper surface thereof; a viscous liquid interposed between the bottom of said housing and the lower surface of said rotor to apply a viscous resistance to said rotor; a revolving shaft having a part thereof rotatably inserted in said recess of said rotor; clutch means in the form of a coil spring fitted on said part of said revolving shaft in a manner to be interposed between said rotor and said revolving shaft through said recess and form a frictional contact with said revolving shaft; a cutout formed in said part of said revolving shaft opposite to the upper end of said recess and having one end of said clutch spring securely supported therein; and friction means comprising a rubber ring interposed between and mutually engaging an annular recess formed at the lower portion of the outer periphery of said rotor and the bottom of said housing.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |