Patent US2339174A successfully refreshed from Google Patents.
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US3556243A
Expired / Lapsed
US
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Steering system
Assignee: Doosan Bobcat North America Inc
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Filing: 1969-04-21
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Granted: 1971-01-19
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Expires: 1989-04-21
Abstract
Abstract A fluid steering system for a land vehicle having front and rear pairs of dirigible wheels. First and second fluid motors are connected in series with each other and serve to actuate first and second valves, respectively, which control pivotal movement of the front and rear pairs of dirigible wheels. Under certain conditions of nonsynchronization of the front and rear pairs of wheels and pivotal movement of the pairs of wheels in a direction so that the front pair of wheels is lagging the rear pair of wheels, provision is made to bypass fluid around the second fluid motor so that the front pair of wheels can catch up with the rear pair of wheels when the rear pair of wheels is substantially in a centered position.
Inventors
- 👤 Jerome R Susag
- 👤 Donald W York
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:36
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/06; B62D7/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
436 words
For use with a vehicle having a body and first and second dirigible wheel means spaced longitudinally from each other and pivotal about substantially vertical steering axes, a steering system comprising first means for pivoting the first wheel means in one direction or the opposite direction from a centered position, the said first pivoting means including a first valve having a first element connected to the first wheel means and a second element movable relative to the said first element for controlling pivoting of the first wheel means second means for pivoting the second wheel means in one direction or the opposite direction from a centered position, the said second pivoting means including a second valve having a third element connected to the second wheel means and a fourth element movable relative to the said third element for controlling pivoting of the second wheel means, a first fluid motor for actuating the said first valve, the said first fluid motor including a fifth element connected to the said second element, a sixth element connected to the vehicle body, and first and second fluid chambers, a second fluid motor for actuating the said second valve, the said second fluid motor including a seventh element connected to the said fourth element, an eighth element connected to the vehicle body, and third and fourth fluid chambers, a source of pressurized fluid, a fluid reservoir, a fiRst conduit connected to the said first chamber, a second conduit connecting the said second and third chambers, a third conduit connected to the said fourth chamber, a third valve connected to the said source, reservoir and first and third conduits and operable to connect the said first conduit to the said source and the said third conduit to the said reservoir and vice versa, and means responsive to the positions of the first and second wheel means for connecting the said second and third conduits for fluid flow from the said second conduit to the said third conduit when the second wheel means is substantially in the centered position thereof and the first wheel means is disposed away from the centered position thereof in one direction and connecting the said second and third conduits for fluid flow from the said third conduit to the said second conduit when the second wheel means is substantially in the centered position thereof and the first wheel means is disposed away from the centered position thereof in the opposite direction so that the first wheel means can be actuated to substantially the centered position thereof while the second wheel means remains substantially at the centered position thereof.
Claim 2
Dependent Claim
436 words
For use with a vehicle having a body and first and second dirigible wheel means spaced longitudinally from each other and pivotal about substantially vertical steering axes, a steering system comprising first means for pivoting the first wheel means in one direction or the opposite direction from a centered position, the said first pivoting means including a first valve having a first element connected to the first wheel means and a second element movable relative to the said first element for controlling pivoting of the first wheel means second means for pivoting the second wheel means in one direction or the opposite direction from a centered position, the said second pivoting means including a second valve having a third element connected to the second wheel means and a fourth element movable relative to the said third element for controlling pivoting of the second wheel means, a first fluid motor for actuating the said first valve, the said first fluid motor including a fifth element connected to the said second element, a sixth element connected to the vehicle body, and first and second fluid chambers, a second fluid motor for actuating the said second valve, the said second fluid motor including a seventh element connected to the said fourth element, an eighth element connected to the vehicle body, and third and fourth fluid chambers, a source of pressurized fluid, a fluid reservoir, a fiRst conduit connected to the said first chamber, a second conduit connecting the said second and third chambers, a third conduit connected to the said fourth chamber, a third valve connected to the said source, reservoir and first and third conduits and operable to connect the said first conduit to the said source and the said third conduit to the said reservoir and vice versa, and means responsive to the positions of the first and second wheel means for connecting the said second and third conduits for fluid flow from the said second conduit to the said third conduit when the second wheel means is substantially in the centered position thereof and the first wheel means is disposed away from the centered position thereof in one direction and connecting the said second and third conduits for fluid flow from the said third conduit to the said second conduit when the second wheel means is substantially in the centered position thereof and the first wheel means is disposed away from the centered position thereof in the opposite direction so that the first wheel means can be actuated to substantially the centered position thereof while the second wheel means remains substantially at the centered position thereof.
Claim 3
Dependent Claim
105 words
A steering system as set forth in claim 1 wherein the said connecting means includes valve means actuatable from a first position blocking fluid communication between the said second and third conduits to a second position connecting the said second and third conduits for fluid flow only from the said second conduit to the said third conduit or to a third position connecting the said second and third conduits for fluid flow only from the said third conduit to the said second conduit and means connected to the said valve means for actuating the said valve means to the said second or third positions thereof.
Claim 4
Dependent Claim
163 words
A steering system as set forth in claim 2 wherein wherein the said actuating means includes a source of electrical power, first and second solenoids connected to the said valve means, 23 a first switch connected to the said source of electrical power and the said solenoids and operable from a first position in which neither solenoid is energized to a second position in which the said first solenoid is energized or to a third position in which the said second solenoid is energized, a third solenoid connected to the said first switch, a second switch actuatable between first and second positions, and a third switch actuatable between third and fourth positions, the said second and third switches being connected in circuit to the said source of electrical power, the said third solenoid and each other and actuatable to connect the said third solenoid to the said source for current flow in one direction or the other direction or to open the circuit.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |