US3712342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for compensating for the variations of the viscosity of a fluid in a hydraulic circuit depending on its temperature
Assignee: Cibie Projecteurs SA
•
Filing: 1971-02-26
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Granted: 1973-01-23
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Expires: 1991-02-26
Abstract
Abstract A compensating device for use in correcting for variations of viscosity in a hydraulic fluid comprising an apertured diaphragm construction of such a nature that the aperture is reduced in area when there is a temperature increase in the hydraulic fluid.
Inventors
- 👤 R Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:40
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/04; F15B21/045; B; B60; B60Q; B60Q1/00; B60Q1/02; B60Q1/04; B60Q1/06; B60Q1/08; B60Q1/10; B60Q1/105
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
A device for use in a hydraulic circuit to compensate for variations in the viscosity of fluid contained in the circuit, comprising: a. A spigot adapted to be engageable with the hydraulic circuit; b. A socket adapted to be engageable with the hydraulic circuit, said spigot and socket being coupled to each other to provide a chamber through which fluid can pass and which is in series with the hydraulic circuit, said chamber having spacedapart, opposed walls defined by the spigot and socket, respectively; and c. at least one diaphragm in the chamber for the control of fluid flow, said diaphragm including a first ring having a substantially zero thermal coefficient of expansion, a second ring coaxial with and adjacent to the first ring and having a non-zero thermal coefficient of expansion, said second ring having a central part axially extending into the first ring, thereby providing an annular section for through fluid flow, and a sealing washer coaxial with said rings and located between one of the rings and the socket, said rings and washer being pressed together to form the diaphragm by the walls of the chamber.
Claim 2
Independent Claim
189 words
A device for use in a hydraulic circuit to compensate for variations in the viscosity of fluid contained in the circuit, comprising: a. A spigot adapted to be engageable with the hydraulic circuit; b. A socket adapted to be engageable with the hydraulic circuit, said spigot and socket being coupled to each other to provide a chamber through which fluid can pass and which is in series with the hydraulic circuit, said chamber having spacedapart, opposed walls defined by the spigot and socket, respectively; and c. at least one diaphragm in the chamber for the control of fluid flow, said diaphragm including a first ring having a substantially zero thermal coefficient of expansion, a second ring coaxial with and adjacent to the first ring and having a non-zero thermal coefficient of expansion, said second ring having a central part axially extending into the first ring, thereby providing an annular section for through fluid flow, and a sealing washer coaxial with said rings and located between one of the rings and the socket, said rings and washer being pressed together to form the diaphragm by the walls of the chamber.
Claim 3
Dependent Claim
24 words
A device according to claim 1, in which the first ring is made of ceramic while the second ring is made of a polyamide.
Claim 4
Dependent Claim
30 words
A device according to claim 1, wherein the spigot is threaded, the socket is threaded, and the spigot and socket are coupled by the threads on the spigot and socket.
References Cited (Backward Citations)
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US2872120A
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US2960109A
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US3340893A
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |