US3650359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillating piston-type dashpots
Assignee: Individual
•
Filing: 1970-02-03
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Granted: 1972-03-21
•
Expires: 1990-02-03
Abstract
Abstract The specification describes a dashpot having a vane member pivotably mounted in a fluid-filled body to be rotatable through an angle of less than 360* . Movement of the vane member displaces the dashpot fluid through a valve that has an adjustable throttling effect and the damping rate of the dashpot is controlled thereby. The valve is mounted in a recess of a necked end of the dashpot body concentric with the pivot axis of the vane member and a control knob having a lip that overlaps said necked end is fixed to the valve to rotate it. A ring-form sealing member has an inner peripheral region secured to the valve and an outer peripheral region secured to the necked end of the body. A supplementary sealing member is compressed between said outer peripheral region and the control knob lip to provide a further seal at this position. A resilient clamping band at the inner peripheral region assists the seal there. Calibration means are also provided between the control knob lip and said necked end of the body to facilitate adjustment of the valve and these calibration means are further employed to set limits to the rotational adjustment of the valve.
Inventors
- 👤 Alan Richard Brine Nash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:27
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/10; F16F9/14; F16F9/145
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
234 words
An adjustable dashpot comprising, in combination, a body, a damping member in said body, rotary bearings supporting said member for angular displacement in said body and at least one fluid-filled space into which said member projects to displace the fluid in said space with its angular movement, a valve member on said body and surrounded by a region of said body, conduit means between said space and said valve member for a flow of the displaced fluid through said valve member, means for adjustment of said valve member to vary the resistance offered by the fluid to movement of the damping member in said space, said adjustment means comprising a rotary control member connected to said valve member, a ring-form sealing member having respective peripheral portions bonded to the valve member and to said body to prevent leakage of fluid from the region of the interface between the valve member and its surrounding body region, the area of the sealing member between said peripheral portions being flexibly deformable with rotation of the control member, a circumferential lip of the control member being arranged to be axially coincident with a first of said peripheral regions of the sealing member, and a supplementary sealing member being gripped between said first peripheral region and a radially inner face of said lip to form a sliding seal between the sealing member and the lip of the control member.
Claim 2
Dependent Claim
234 words
An adjustable dashpot comprising, in combination, a body, a damping member in said body, rotary bearings supporting said member for angular displacement in said body and at least one fluid-filled space into which said member projects to displace the fluid in said space with its angular movement, a valve member on said body and surrounded by a region of said body, conduit means between said space and said valve member for a flow of the displaced fluid through said valve member, means for adjustment of said valve member to vary the resistance offered by the fluid to movement of the damping member in said space, said adjustment means comprising a rotary control member connected to said valve member, a ring-form sealing member having respective peripheral portions bonded to the valve member and to said body to prevent leakage of fluid from the region of the interface between the valve member and its surrounding body region, the area of the sealing member between said peripheral portions being flexibly deformable with rotation of the control member, a circumferential lip of the control member being arranged to be axially coincident with a first of said peripheral regions of the sealing member, and a supplementary sealing member being gripped between said first peripheral region and a radially inner face of said lip to form a sliding seal between the sealing member and the lip of the control member.
Claim 3
Dependent Claim
33 words
A dashpot according to claim 1 wherein a resilient clamping band is applied to the second of said peripheral regions of the ring-form sealing member to assist its engagement with the valve member.
Claim 4
Dependent Claim
37 words
A dashpot according to claim 1 wherein an enclosed space is formed between the ring-form member and the control member to the exterior of the seal provided by said member, said space being filled with a grease.
Claim 5
Dependent Claim
32 words
A dashpot according to claim 1 wherein respective annular recessed regions are provided in the valve member and in the dashpot body to receive said peripheral regions of the ring-form sealing member.
Claim 6
Dependent Claim
37 words
A dashpot according to claim 1 wherein a portion of the dashpot body extends axially within said circumferential lip of the control knob, said first peripheral regioN of the ring-form member being secured to said body portion.
Claim 7
Dependent Claim
48 words
A dashpot according to claim 5 wherein said body portion extends axially from said at least one fluid-filled space within the body and is of lesser cross-sectional area in a plane transverse to the axial direction than the body in the region of said at least one space.
Claim 8
Dependent Claim
39 words
A dashpot according to claim 5 wherein a calibrated scale and a fiduciary mark are respectively carried by adjacent parts of said control member and body to indicate the rotational adjustment position of the control member on the body.
Claim 9
Dependent Claim
78 words
A dashpot according to claim 7 wherein a part of the scale projects into the space between the control member lip and said body portion, an interior face of the lip bounding said space, projecting elements on the interior face of the lip at an angular spacing greater than the angular extent of said projecting part of the scale being arranged to cooperate with said projecting part in defining limits for the angular movement of the control member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |