Patent US1552286A successfully refreshed from Google Patents.
Patent US3770076A successfully refreshed from Google Patents.
US3770076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic systems
Assignee: Ferranti Engineering Ltd
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Filing: 1971-05-27
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Granted: 1973-11-06
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Expires: 1991-05-27
Abstract
Abstract In an hydraulic system a pump draws liquid from a header tank by way of an auxiliary tank which is connected to the header tank, and the discharge from the pump is fed to either tank or partly to each tank under the control of a diverter valve in order to maintain the temperature of the working liquid within desired limits.
Inventors
- 👤 P Ward
- 👤 R Smith
- 👤 D Siverns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:58
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F15; F15B; F15B21/00; F15B21/04; F15B21/042; F15B21/0423; F15B21/0427; F16F; F16F9/00; F16F9/32; F16F9/42; G; G05; G05D; G05D23/00; G05D23/01; G05D23/12; G05D23/185; F15B1/00; F15B1/26; F15B2211/00; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/51; F15B2211/515; F15B2211/5157; F15B2211/60; F15B2211/61; F15B2211/611; F15B2211/62
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
185 words
A vehicle for handling freight containers, said vehicle comprising an arched frame, a set of wheels supporting each side of the frame, and engine on each side of the frame, a main pump and a booster pump driven by each engine, the wheels of each set being driven by pressure liquid from the main pump, an auxiliary tank from which the booster pump draws liquid for supplying the suction side of the main pump, a header tank connected to the auxiliary tank means for maintaining a difference in temperature between the liquids in each tank, a diverter valve having an inlet port connected to the discharge side of the main pump, an outlet port connected to the auxiliary tank and a second outlet port connected to the header tank, and a temperature sensitive element arranged in the liquid discharged from the main pump to control the operation of the diverter valve whereby the liquid from the main pump is directed between the auxiliary and header tanks in accordance with the temperature of the liquid to maintain the temperature of the working liquid within desired limits.
Claim 2
Dependent Claim
185 words
A vehicle for handling freight containers, said vehicle comprising an arched frame, a set of wheels supporting each side of the frame, and engine on each side of the frame, a main pump and a booster pump driven by each engine, the wheels of each set being driven by pressure liquid from the main pump, an auxiliary tank from which the booster pump draws liquid for supplying the suction side of the main pump, a header tank connected to the auxiliary tank means for maintaining a difference in temperature between the liquids in each tank, a diverter valve having an inlet port connected to the discharge side of the main pump, an outlet port connected to the auxiliary tank and a second outlet port connected to the header tank, and a temperature sensitive element arranged in the liquid discharged from the main pump to control the operation of the diverter valve whereby the liquid from the main pump is directed between the auxiliary and header tanks in accordance with the temperature of the liquid to maintain the temperature of the working liquid within desired limits.
Claim 3
Dependent Claim
26 words
A vehicle as in claim 1 wherein the auxiliary tank is located near the engine and the header tank is located higher up on the frame.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |