Patent US5934406A successfully refreshed from Google Patents.
US5934406A
Expired / Lapsed
US
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Jerk control valve for pilot operated steering system
Assignee: Caterpillar Inc
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Filing: 1997-05-29
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Granted: 1999-08-10
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Expires: 2017-05-29
Abstract
Abstract A jerk control valve adapted for use in a pilot operated steering system has a pilot operated valve biased to an open position by a spring for communicating left steer and right steer pilot lines to a tank through a pair of orifices. The pilot operated valve is moveable to a closed position blocking communication through the first and second orifices when the highest pressure of the left and right steer pilot lines exceeds a predetermined value. The left and right steer pilot lines are continuously communicated with the tank through a pair of orifice devices.
Inventors
- 👤 Paul A. Dvorak
- 👤 Steven R. Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:31
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
A jerk control valve adapted for use in a pilot operated steering system having a tank, left steer and right steer pilot lines, and a check valve disposed in each of the pilot lines, the jerk control valve comprising: a right steer flow passage communicating the right steer pilot line with the tank; a left steer flow passage communicating the left steer pilot line with the tank; first orifice means disposed between the right steer flow passage and the tank; second orifice means disposed between the left steer flow passage and the tank; third orifice means disposed in the right steer flow passage; fourth orifice means disposed in the left steer flow passage; a pilot operated valve having an open position establishing communication through the first and second orifice means and a closed position blocking communication through the first and second orifice means, the pilot operated valve having a spring biasing the pilot operating valve to the open position; and a resolver disposed to transmit the highest pilot pressure from the right steer pilot line and the left steer pilot line to the end of the pilot operated valve.
Claim 2
Dependent Claim
189 words
A jerk control valve adapted for use in a pilot operated steering system having a tank, left steer and right steer pilot lines, and a check valve disposed in each of the pilot lines, the jerk control valve comprising: a right steer flow passage communicating the right steer pilot line with the tank; a left steer flow passage communicating the left steer pilot line with the tank; first orifice means disposed between the right steer flow passage and the tank; second orifice means disposed between the left steer flow passage and the tank; third orifice means disposed in the right steer flow passage; fourth orifice means disposed in the left steer flow passage; a pilot operated valve having an open position establishing communication through the first and second orifice means and a closed position blocking communication through the first and second orifice means, the pilot operated valve having a spring biasing the pilot operating valve to the open position; and a resolver disposed to transmit the highest pilot pressure from the right steer pilot line and the left steer pilot line to the end of the pilot operated valve.
Claim 3
Dependent Claim
33 words
The jerk control valve of claim 1 wherein the effective areas of the first and second orifice means are equal and the effective areas of the third and fourth orifice means are equal.
Claim 4
Dependent Claim
22 words
The jerk control valve of claim 2 wherein the third and fourth orifice means each include a pair of serially disposed orifices.
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) | 2002-08-09 | 2003-02-08 | 2003-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-09 | 2007-02-08 | 2007-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-09 | 2011-02-08 | 2011-08-10 | $7700.00 | Window Closed / Lapsed |