Patent US3692138A successfully refreshed from Google Patents.
US3692138A
Expired / Lapsed
US
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Dual steering system
Assignee: Doosan Bobcat North America Inc
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Filing: 1970-12-09
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Granted: 1972-09-19
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Expires: 1990-12-09
Abstract
Abstract A dual fluid steering system utilizing two pumps to supply fluid to actuators which turn the wheels for steering. The control valves and other portions of the system are arranged so that each of the pumps supplies fluid to both of the actuators during normal operation whereby if one of the pumps fails, the other pump can continue to be utilized to operate both actuators and turn both of the wheels at a reduced rate under emergency conditions resulting from the failure of one pump. One control valve is connected to the head end of one actuator and the rod end of the other. The other control valve is connected to the rod end of the one actuator and the head end of the other.
Inventors
- 👤 Kenneth C Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:53
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/30; B62D5/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A dual steering system comprising two extensible and contractible fluid actuators, located in allochiral relation and connected respectively to turn pivotally two dirigible wheels of a vehicle, two pumps for supplying fluid to the said actuators, and two steering valves connected respectively to control the outputs of the said two pumps, in a manner one of the said valves being connected to the inner end of one actuator and the outer end of the other and the other valve being connected to the outer end of the one actuator and the inner end of the other such that during normal operation each pump delivers fluid to both actuators but without intermixing of the fluid outputs of the two pumps.
Claim 2
Dependent Claim
119 words
A dual steering system comprising two extensible and contractible fluid actuators, located in allochiral relation and connected respectively to turn pivotally two dirigible wheels of a vehicle, two pumps for supplying fluid to the said actuators, and two steering valves connected respectively to control the outputs of the said two pumps, in a manner one of the said valves being connected to the inner end of one actuator and the outer end of the other and the other valve being connected to the outer end of the one actuator and the inner end of the other such that during normal operation each pump delivers fluid to both actuators but without intermixing of the fluid outputs of the two pumps.
Claim 3
Dependent Claim
46 words
A dual steering system as specified in claim 1 in which the said actuators are piston and cylinder type devices arranged with the piston rods inwardly disposed and pivotally connected to the vehicle and the cylinders outwardly disposed and connected to linkages for pivoting the wheels.
Claim 4
Dependent Claim
64 words
A dual steering system as specified in claim 2 which includes an operator''s steering wheel mounted on a steering mechanism connected to operate the said two valves in unison, a link connecting the two dirigible wheels to maintain them in the desired relationship at all times, and a follow up connection between one of the said wheel linkages and the said valve operating mechanism.
Claim 5
Dependent Claim
75 words
A dual steering systeM as specified in claim 1 which includes a pair of emergency valves located respectively between each said pump and its respective steering valve, conduits connected respectively between each pump and the other emergency valve, whereby upon failure of one of the said pumps an emergency valve may be opened to provide for one pump to supply fluid through both steering valves to accomplish emergency steering at a slower than normal rate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |