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US3890995A
Expired / Lapsed
US
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Flow-sensing switch for backup steering system
Assignee: Deere and Co
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Filing: 1974-05-01
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Granted: 1975-06-24
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Expires: 1994-05-01
Abstract
Abstract Disclosed is a vehicle power steering system including a flowsensing switch for energizing an electrohydraulic safety backup system for supplying fluid pressure to the steering motor of the vehicle when a main pump becomes inoperative to supply pressure fluid to the steering motor. The flow-sensing switch is in the form of a poppet valve including a valve element which is normally seated to complete an electrical circuit for energizing an electric motor for driving an auxiliary pump. The poppet valve element is held open by fluid pressure delivered by the main pump when the main pump is working properly. The output of the auxiliary pump is connected to the poppet valve element such that the fluid pressure delivered by the auxiliary pump aids in maintaining the poppet valve element in its closed position.
Inventors
- 👤 Wayne Russel Miller
- 👤 Jr Robert James Lucke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:00
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/004; B; B62; B62D; B62D5/00; B62D5/06; B62D5/30; B62D5/32; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/2569; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A flow-sensing valve having components acting as electrical switch means for completing a circuit in response to a preselected flow condition, comprising: a valve body defining a valve bore; an inlet and an outlet port connected to the bore at axially spaced locations; an electrical conductive means extending through the valve body and including a valve seat located in the bore between the inlet and outlet; electrical insulating means surrounding the electrical conductive means for fixing the latter and insulating it from the valve body; a valve element axially shiftably mounted in the bore and having a seating surface located for engagement with said valve seat; axially yieldable means normally biasing said valve element to a closed position wherein the seating surface thereof engages said valve seat; and said yieldable means being responsive to a predetermined pressure at said inlet port to yield axially so as to allow the valve element to shift to an open position wherein the inlet and outlet ports are in fluid communication.
Claim 2
Dependent Claim
167 words
A flow-sensing valve having components acting as electrical switch means for completing a circuit in response to a preselected flow condition, comprising: a valve body defining a valve bore; an inlet and an outlet port connected to the bore at axially spaced locations; an electrical conductive means extending through the valve body and including a valve seat located in the bore between the inlet and outlet; electrical insulating means surrounding the electrical conductive means for fixing the latter and insulating it from the valve body; a valve element axially shiftably mounted in the bore and having a seating surface located for engagement with said valve seat; axially yieldable means normally biasing said valve element to a closed position wherein the seating surface thereof engages said valve seat; and said yieldable means being responsive to a predetermined pressure at said inlet port to yield axially so as to allow the valve element to shift to an open position wherein the inlet and outlet ports are in fluid communication.
Claim 3
Dependent Claim
23 words
The flow-sensing valve defined in claim 1 wherein said electrical conductive means comprising a metal rod threaded into a metal, ring-like valve seat.
Claim 4
Dependent Claim
27 words
The flow-sensing valve defined in claim 2, wherein said electrical insulating means comprises first and second housing means bonded to said rod and to said valve seat.
Claim 5
Dependent Claim
83 words
The flow-sensing valve defined in claim 1 wherein said valve element is a poppet valve element having a closed end defining a seating surface and being adjacent to a reduced-in-diameter portion of the valve element which cooperates with the valve bore to define an annular space; said valve element having a hollow interior; orifice means in said valve element connecting said annular space in fluid communication with said hollow interior; and said outlet port being located in fluid communication with said annular space.
Claim 6
Dependent Claim
101 words
The flow-sensing valve defined in claim 4 wherein said valve body includes a second inlet port connected to the valve bore for connection to the hollow interior of said valve element at an end thereof which is opposite said closed end, whereby if pressure fluid is admitted to the second inlet port when the valve element in said closed position it will act to aid the yieldable means in keeping the valve element closed and will flow out the outlet path by a fluid passage defined at least in part by said hollow interior and orifice means of said valve element.
References Cited (Backward Citations)
US2396984A
Cited
US3007647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |