US3613818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency supply system for vehicle hydraulic components
Assignee: Caterpillar Inc
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Filing: 1969-09-04
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Granted: 1971-10-19
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Expires: 1989-09-04
Abstract
Abstract An emergency supply of fluid under pressure to the hydraulic system of a vehicle with a normal supply derived from a primary source of pressure such as an engine-driven pump. Pressure for the emergency system is derived from a secondary source or wheeldriven pump to insure a supply upon engine failure and whenever the vehicle is in motion. Flow from the emergency system supplements or replaces that in the normal system whenever the normal system flow falls below a predetermined value. Automatic valves also prevent flow from either system toward an idle pump or rupture in the other system.
Inventors
- 👤 George Schubert
- 👤 Lloyd D Swayze
- 👤 John B Waggoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:41
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; B; B60; B60J; B60J7/00; B60J7/08; B60J7/12; B60J7/1226; B60J7/1265; B60J7/1269; B60J7/1273; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/168
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
An emergency fluid supply system for a hydraulic circuit having a primary and a secondary source of fluid under pressure comprising means to permit flow from said secondary source into said primary system in parallel and confluently with the flow therein, normally closed valve means preventing such flow, and means responsive to the flow rate from said primary source falling below a predetermined value to automatically permit opening of said vale means, whereby said secondary source supplies supplementary fluid to said hydraulic circuit when said flow rate in said primary system drops below sad predetermined value.
Claim 2
Dependent Claim
96 words
An emergency fluid supply system for a hydraulic circuit having a primary and a secondary source of fluid under pressure comprising means to permit flow from said secondary source into said primary system in parallel and confluently with the flow therein, normally closed valve means preventing such flow, and means responsive to the flow rate from said primary source falling below a predetermined value to automatically permit opening of said vale means, whereby said secondary source supplies supplementary fluid to said hydraulic circuit when said flow rate in said primary system drops below sad predetermined value.
Claim 3
Dependent Claim
61 words
The system of claim 1 with means for sensing said flow rate from said primary source including a main fluid passage means having a normal diameter and a smaller diameter, and pressure sensing passage means intersecting and communicating with said main passage means at both diameters, said flow rate sensing means signalling said means to permit opening of said valve means.
Claim 4
Dependent Claim
41 words
The system of claim 1 for vehicle use in which power for said primary source of fluid under pressure is derived from the vehicle engine, and a separate soUrce of power is used for said secondary source of fluid under pressure.
Claim 5
Dependent Claim
31 words
The system of claim 3 in which said separate source of power is derived from the relative movement of the vehicle with respect to the surface upon which said vehicle travels.
Claim 6
Dependent Claim
37 words
The system of claim 4 in which said separate source includes a pump means which is operable in either of two directions in dependence upon the operation of said vehicle in either of forward or reverse directions.
Claim 7
Dependent Claim
43 words
The system of claim 1 in which further passage means are provided for fluid from said primary and secondary sources to combine in a common flow, and check valve means to prevent fluid from either said source from flowing toward the other source.
Claim 8
Dependent Claim
67 words
In an emergency hydraulic fluid supply system for a vehicle steering mechanism which has an engine-driven pump normally providing fluid under pressure, the improvement comprising; a reversible emergency pump which is operable only when said vehicle is in motion, and means for permitting said reversible pump to supply supplemental fluid in response to a decrease in the flow rate from said engine-driven pump to said steering mechanism.
Claim 9
Dependent Claim
67 words
In an emergency hydraulic fluid supply system for a vehicle steering mechanism which has an engine-driven pump normally providing fluid under pressure, the improvement comprising; a reversible emergency pump which is operable only when said vehicle is in motion, and means for permitting said reversible pump to supply supplemental fluid in response to a decrease in the flow rate from said engine-driven pump to said steering mechanism.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |