Patent EP0467799A1 successfully refreshed from Google Patents.
Patent US5472354A successfully refreshed from Google Patents.
US3672475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dash pot including temperature sensitive valve means
Assignee: Individual
•
Filing: 1970-07-07
•
Granted: 1972-06-27
•
Expires: 1990-07-07
Abstract
Abstract A dashpot or damper has means for compensating for changes of viscosity in the damping fluid due to changes of temperature. Restricted flow paths for the damping fluid that determine the damping force are composed in part of members that are displaceable with changes of temperature so that the crosssectional areas of the flow paths vary at different temperatures and compensate at least partially for the concurrent fluid viscosity changes.
Inventors
- 👤 Alan Richard Brine Nash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:02
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/10; F16F15/16; F16F15/161; E; E05; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/21; E05Y2201/252; E05Y2201/254; E05Y2201/256; E05Y2201/262; E05Y2201/266
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
248 words
A dashpot comprising, in combination, a body, at least one enclosed space within said body, a damping fluid in said space, a damping member mounted in the body to be movable in said space against the resistance afforded by the damping fluid, a flow route being provided for the damping fluid displaced by movement of the damping member, a temperature-sensitive device comprising a control member defining a boundary portion of said flow route and a mounting on which the control member is displaceable to increase and reduce the cross-sectional area of said route, said control member comprising opposite end elements and an intermediate element interconnecting said end elements by regions of reduced thickness and being pivotable relatively thereto at said regions, the end elements being disposed at a small angle to the intermediate element, mutually remote regions of the end elements engaging the mounting pivotally and the spacing of said regions being determined thereby, variations between said spacing and the combined lengths of the elements of the control member with change of temperature causing pivoting of the end elements on the mounting and therewith pivoting of the intermediate element relative to the end elements to move the intermediate element towards and away from the mounting thereby varying the cross-sectional area of said flow route, the arrangement being such that variations in damping rate due to changes in viscosity of the damping fluid with changes of temperature are reduced by the associated variation of the flow route cross-sectional area.
Claim 2
Dependent Claim
248 words
A dashpot comprising, in combination, a body, at least one enclosed space within said body, a damping fluid in said space, a damping member mounted in the body to be movable in said space against the resistance afforded by the damping fluid, a flow route being provided for the damping fluid displaced by movement of the damping member, a temperature-sensitive device comprising a control member defining a boundary portion of said flow route and a mounting on which the control member is displaceable to increase and reduce the cross-sectional area of said route, said control member comprising opposite end elements and an intermediate element interconnecting said end elements by regions of reduced thickness and being pivotable relatively thereto at said regions, the end elements being disposed at a small angle to the intermediate element, mutually remote regions of the end elements engaging the mounting pivotally and the spacing of said regions being determined thereby, variations between said spacing and the combined lengths of the elements of the control member with change of temperature causing pivoting of the end elements on the mounting and therewith pivoting of the intermediate element relative to the end elements to move the intermediate element towards and away from the mounting thereby varying the cross-sectional area of said flow route, the arrangement being such that variations in damping rate due to changes in viscosity of the damping fluid with changes of temperature are reduced by the associated variation of the flow route cross-sectional area.
Claim 3
Dependent Claim
28 words
A dashpot according to claim 1 including resilient means acting upon the mounting-engaging regions of the control member to maintain said regions in pivotal contact with the mounting.
Claim 4
Dependent Claim
33 words
A dashpot according to claim 1 wherein said end and intermediate elements are formed integrally in said control member, said regions of reduced thickness defining the junctions of the elements with each other.
Claim 5
Dependent Claim
63 words
A dashpot according to claim 1 further comprising resilient acting upon the control member to urge the intermediate element in a direction that provides an increased cross-sectional area for the flow route. 5. A dashpot according to claim 1 further comprising restraint means between the intermediate element and the mounting to prevent or limit pivoting of the intermediate element relative to said mounting.
Claim 6
Dependent Claim
57 words
A dashpot according to claim 5 wherein said restraint means comprises a location element carried by the control member, an element of the mounting providing a non-rotatable engagement for said location element, said location element being on or adjacent to said intermediate element and being slidable relative to said mounting element with movement of the intermediate element.
Claim 7
Dependent Claim
61 words
A dashpot according to claim 1 wherein the damping member comprises a pivot support on which it is angularly displaceable, and a plurality of vanes projecting symmetrically from the axis of rotation of the member, respective enclosed spaces being provided in the body for each of said vanes, respective flow routes for the displaced fluid being provided between the enclosed spaces.
Claim 8
Dependent Claim
106 words
A dashpot according to claim 7 wherein respective temperature-sensitive devices are provided between each of said enclosed spaces, each device comprising a control member that defines a boundary portion of the flow route between associated spaces and being displaceable to increase and reduce the cross-sectional area of said route, pivot mounting means for each control member being provided in a radially outer region of the dashpot body so that the member projects inwardly across the radial space between said region of the dashpot body and the damping member, a clearance between the camping member and each control member defining said flow routes between the enclosed spaces.
Claim 9
Dependent Claim
41 words
A dashpot according to claim 8 wherein clearances are provided between the vanes and the adjacent walls of the dashpot body, said clearances being arranged to be of substantially smaller cross-section than the clearances associated with said temperature-sensitive device flow routes.
References Cited (Backward Citations)
GB859839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |