US3793908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric pneumatic shift control
Assignee: Ingersoll Rand Co
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Filing: 1972-04-13
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Granted: 1974-02-26
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Expires: 1992-04-13
Abstract
Abstract A means for controlling a transmission from either one of a pair of operator stations. A multi-position cylinder conditions the transmission for a given direction of travel and speed range. Air pressure is directed to various chambers within the cylinder to achieve the desired position by a plurality of solenoid-operated valves. The valves are selectively energized by a circuit means, including a switch means located in each of the operator stations. A selector switch in one station selectively connects one of the switch means with a source of electrical energy.
Inventors
- 👤 R Luft
- 👤 Halvorson Leroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:33
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/26; F16H61/28; F16H61/30; F16H61/2807; F16H2061/301
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A control means for a transmission having a shift arm capable of being moved between a plurality of positions, each of said positions conditioning the transmission for a given direction and speed range, comprising: a multiposition shift cylinder operatively connected to the shift arm for moving said arm to its said positions; said cylinder having a plurality of ports which, when selectively pressurized, cause said cylinder to move to each of its multipositions; a solenoid-actuated valve communicating with each of said ports and capable, when energized, of directing fluid pressure thereto; circuit means including a first manually actuated switch means for selectively energizing certain ones of said valves to extend said cylinder to a desired one of its multipositions.
Claim 2
Dependent Claim
119 words
A control means for a transmission having a shift arm capable of being moved between a plurality of positions, each of said positions conditioning the transmission for a given direction and speed range, comprising: a multiposition shift cylinder operatively connected to the shift arm for moving said arm to its said positions; said cylinder having a plurality of ports which, when selectively pressurized, cause said cylinder to move to each of its multipositions; a solenoid-actuated valve communicating with each of said ports and capable, when energized, of directing fluid pressure thereto; circuit means including a first manually actuated switch means for selectively energizing certain ones of said valves to extend said cylinder to a desired one of its multipositions.
Claim 3
Dependent Claim
44 words
A control for a transmission according To claim 1 and further comprising; a second manually actuated switch means for selectively energizing at least a portion of said circuit means; and a selector switch for selectively energizing one of said first and second switch means.
Claim 4
Dependent Claim
94 words
A control means according to claim 2, wherein the transmission is capable of automatically shifting from a high gear to a lower gear under conditions of acceleration, and further comprising: a throttle valve arm connected with said transmission to condition said transmission for said lower gear under conditions of acceleration; a fluid cylinder engageable with said arm and movable under the influence of fluid pressure to move and maintain the throttle valve arm in the position it would assume under said acceleration conditions; and means for selectively directing fluid pressure to said fluid cylinder.
Claim 5
Dependent Claim
102 words
A control for an automatic transmission capable of automatically shifting from a low gear to a higher gear comprising: a multiposition shift cylinder operatively connected to and capable of initially conditioning the transmission for said low gear; a plurality of solenoid-operated valves for directing fluid pressure to said cylinder; circuit means, including a first manually actuated switch means, for selectively energizing the desired ones of said valves to orient said cylinder to initially condition the transmission for said low gear; and means operable upon energization of a certain one of said valves to prevent said transmission from shifting to a higher gear.
Claim 6
Dependent Claim
102 words
A control for an automatic transmission capable of automatically shifting from a low gear to a higher gear comprising: a multiposition shift cylinder operatively connected to and capable of initially conditioning the transmission for said low gear; a plurality of solenoid-operated valves for directing fluid pressure to said cylinder; circuit means, including a first manually actuated switch means, for selectively energizing the desired ones of said valves to orient said cylinder to initially condition the transmission for said low gear; and means operable upon energization of a certain one of said valves to prevent said transmission from shifting to a higher gear.
Claim 7
Dependent Claim
72 words
A control according to claim 4 wherein said last mentioned means comprises; a throttle valve arm connected with said transmission to insure the transmission is conditioned for said low gear under conditions of acceleration; a fluid cylinder engageable with said arm and movable under the influence of fluid pressure received from said certain valve to move and maintain the throttle valve arm in the position it would assume under said acceleration conditions.
Claim 8
Dependent Claim
41 words
A control according to claim 5, and further comprising: a second manually actuated switch means for selectively energizing at least a portion of said circuit means; and a selector switch for selectively energizing one of said first and second switch means.
Claim 9
Dependent Claim
95 words
A control for an automatic transmission driven by an engine, which transmission is capable of shifting from a high gear to a lower gear under conditions of acceleration of the engine, comprising: a throttle valve arm connected with said transmission to condition said transmission for said lower gear under conditions of acceleration; a fluid cylinder engageable with said arm and movable under the influence of fluid pressure to move and maintain the throttle valve arm in the position it would assume under said acceleration conditions; and means for selectively directing fluid pressure to said cylinder.
Claim 10
Dependent Claim
95 words
A control for an automatic transmission driven by an engine, which transmission is capable of shifting from a high gear to a lower gear under conditions of acceleration of the engine, comprising: a throttle valve arm connected with said transmission to condition said transmission for said lower gear under conditions of acceleration; a fluid cylinder engageable with said arm and movable under the influence of fluid pressure to move and maintain the throttle valve arm in the position it would assume under said acceleration conditions; and means for selectively directing fluid pressure to said cylinder.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |