Patent US4915581A successfully refreshed from Google Patents.
Patent US3877345A successfully refreshed from Google Patents.
US3877345A
Expired / Lapsed
US
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Displacement sensitive automatic diverter valve
Assignee: Caterpillar Inc
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Filing: 1973-11-19
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Granted: 1975-04-15
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Expires: 1993-11-19
Abstract
Abstract Hydraulic drive circuitry for an elevator equipped scraper vehicle. Separate circuitry including pump means and motor means for operating the elevator drive and for steering the vehicle respectively. A portion of steering pump means flow is selectively directed to the elevator drive circuitry and such directed flow is automatically returned to the steering circuitry to provide maximum flow when needed. Diverter valve means are mechanically linked to the steering control mechanism so that the valve automatically responds to the movement of such control mechanism for directing steering flow from the elevator drive circuitry to the steering circuitry upon demand. Upon fulfillment of steering demand, flow is again automatically supplied to the elevator drive circuitry from the steering circuit by means of the mechanically linked diverter valve.
Inventors
- 👤 Edward J Ohms
- 👤 Lawrence F Schexnayder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:55
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; E; E02; E02F; E02F3/00; E02F3/04; E02F3/64; E02F3/65; E02F3/651; E02F3/654; E02F3/655; E02F9/00; E02F9/20; E02F9/22; E02F9/2221; E02F9/2239; E02F9/2278; E02F9/2292; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/20576; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/3059; F15B2211/30595; F15B2211/60; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/71; F15B2211/7142
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
204 words
A fluid control system for controlling flow of pressure fluid from first and second pump means to first and second fluid motor means for driving said motor means including; first fluid communication means for communicating fluid from said first pump means to said first fluid motor means, second fluid communication means for communicating fluid from said second pump means to said second fluid motor means, said first fluid communication means including first control valve means for controlling fluid flow to said first motor means and for controlling the speed of operation of said first motor means, second control valve means for controlling the amount of fluid flow to sAid second motor means, diverter means for selectively diverting some fluid flow from said second fluid communication means to said first fluid communication means, said diverter means including sensing valve means and mechanical linkage means between said sensing valve means and said second control valve means for directly mechanically transmitting movements of said second control valve means to said sensing valve means for automatically conditioning said diverter means to redirect diverted fluid from said first fluid communication means to said second fluid communication means in response to movement and positioning of said second control valve means.
Claim 2
Dependent Claim
204 words
A fluid control system for controlling flow of pressure fluid from first and second pump means to first and second fluid motor means for driving said motor means including; first fluid communication means for communicating fluid from said first pump means to said first fluid motor means, second fluid communication means for communicating fluid from said second pump means to said second fluid motor means, said first fluid communication means including first control valve means for controlling fluid flow to said first motor means and for controlling the speed of operation of said first motor means, second control valve means for controlling the amount of fluid flow to sAid second motor means, diverter means for selectively diverting some fluid flow from said second fluid communication means to said first fluid communication means, said diverter means including sensing valve means and mechanical linkage means between said sensing valve means and said second control valve means for directly mechanically transmitting movements of said second control valve means to said sensing valve means for automatically conditioning said diverter means to redirect diverted fluid from said first fluid communication means to said second fluid communication means in response to movement and positioning of said second control valve means.
Claim 3
Dependent Claim
34 words
The invention of claim 1, wherein said diverter means further include pilot valve means for transmitting pilot fluid pressure to said sensing valve means in response to movement of said first control valve means.
Claim 4
Dependent Claim
46 words
The invention of claim 2, wherein said diverter means further includes diverter valve means for selectively directly connecting said first fluid communication means with said second fluid communication means in response to a pilot pressure signal from said pilot valve means and said sensing valve means.
Claim 5
Dependent Claim
25 words
The invention of claim 2, wherein said first control valve means and said pilot valve means are mechanically connected for simultaneous movement by lever-linkage means.
Claim 6
Dependent Claim
52 words
The invention of claim 1 in a scraper vehicle equipped with an elevator device, wherein said first fluid motor means include a variable speed fluid motor for said elevator device in said scraper vehicle and wherein said second fluid motor means include a plurality of fluid motors for steering said scraper vehicle.
Claim 7
Dependent Claim
88 words
The invention of claim 4, wherein said lever-linkage means is selectively manually positionable in any of a neutral position or first, second or third sequentially placed speed positions and wherein said diverter means is operative to divert fluid flow from said second fluid communication means to said first fluid communication means only when said lever-linkage means is disposed in said third position, and detent means associated with said first control valve means for retaining said lever-linkage means in each of said neutral or first, second, and third positions.
Claim 8
Dependent Claim
115 words
The invention of claim 3, wherein said sensing valve means include a sensing spool member which is directly connected for movement with said mechanical linkage means and which responds directly to movements of said second control valve means, said spool member being axially moveable within said sensing valve means between opposed extreme end positions and a mid-range between said extreme positions, said sensing spool member acting to block flow of pilot pressure from said pilot valve means to said diverter valve means when disposed in either of said opposed extreme end positions and acting to permit flow of pilot pressure from said pilot valve means to said diverter valve means when disposed in said mid-range.
Claim 9
Dependent Claim
49 words
The invention of claim 5, wherein said mechanical linkage means include a manually activated operator control lever for causing selective movement of said second control valve means and said sensing valve means to control the flow of fluid transmitted to said second motor means for steering said scraper vehicle.
Claim 10
Dependent Claim
35 words
The invention of claim 8, wherein said second pump means include primary and secondary fluid pumps and wherein said primary fluid pump communicates at all times with said second motor means for steering said vehicle.
Claim 11
Dependent Claim
62 words
The invention of claim 3, wherein said diverter valve means include a diverter spool member mounted for reciprocating movement within said diverter valve means, said diverter spool member being moveable in a first direction under the influence of pilot pressure from said sensing valve means and said diverter spool member being biased for movement in the opposite direction by mechanical spring means.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |