Patent US4177884A successfully refreshed from Google Patents.
US4177884A
Expired / Lapsed
US
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Damping mechanisms
Assignee: W Vinten Ltd
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Filing: 1978-06-02
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Granted: 1979-12-11
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Expires: 1998-06-02
Abstract
Abstract The invention comprises an adjustable damping mechanism for such as pan and tilt heads comprising two or more mateable surfaces operating with lubrication wherein the pressure of one surface on the other is variable and combines solidity when stationary, drag proportional to velocity in movement up to whip pan velocity after which the drag remains substantially constant.
Inventors
- 👤 William P. Vinten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:07
CPC Classifications
F; F16; F16M; F16M11/00; F16M11/02; F16M11/18; F16F; F16F7/00; F16F7/02; F16F7/04; F16M11/04; F16M11/06; F16M2200/00; F16M2200/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A damping mechanism comprising at least a pair of mateable surfaces, one of said surfaces being substantially resistive to lubricants, the other of said surfaces being substantially absorbent of lubricants, said surfaces being in engagement, and means for varying the pressure of one of said surfaces on the other of said surfaces to vary the degree of drag so that when said two surfaces are moved in the same plane relative to each other the degree of damping is proportional to the relative velocity of said two surfaces up to a whip pan velocity.
Claim 2
Dependent Claim
94 words
A damping mechanism comprising at least a pair of mateable surfaces, one of said surfaces being substantially resistive to lubricants, the other of said surfaces being substantially absorbent of lubricants, said surfaces being in engagement, and means for varying the pressure of one of said surfaces on the other of said surfaces to vary the degree of drag so that when said two surfaces are moved in the same plane relative to each other the degree of damping is proportional to the relative velocity of said two surfaces up to a whip pan velocity.
Claim 3
Dependent Claim
16 words
A damping mechanism according to claim 1 wherein said surface resistive to lubricants is of polytetrafluoroethylene.
Claim 4
Dependent Claim
16 words
A damping mechanism according to claim 1 wherein said surface absorbent of lubricants is of Nebar.
Claim 5
Dependent Claim
16 words
A damping mechanism according to claim 1 and further including channels in said lubricant absorbent surface.
Claim 6
Dependent Claim
14 words
A damping mechanism according to claim 1 wherein said surfaces are of frusto-conical section.
Claim 7
Dependent Claim
19 words
A damping mechanism according to claim 5 and further including means in said frusto-conical sections for improved lubricant dispension.
References Cited (Backward Citations)
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Cited
US2614896A
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US3101979A
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US3140761A
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US3877552A
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |