US3613844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forward-reverse and brake control valve
Assignee: Aisin Corp
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Filing: 1969-11-25
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Granted: 1971-10-19
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Expires: 1989-11-25
Abstract
Abstract A transmission control device for use on a self-propelled vehicle such as an industrial lift truck wherein a changeover valve connected both to a manually shiftable lever and to a brake pedal is rotatable and axially shiftable thereby so as to have clutch means communicate with or cutoff from a source of pressurized fluid.
Inventors
- 👤 Tadao Asano
- 👤 Hiroji Yamaguchi
- 👤 Kazuo Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:22
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/07509; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
A transmission control device including a hydraulic clutch for a self-propelled vehicle having a brake pedal in which the hydraulic clutch may be engaged, disengaged or partially engaged by hydraulic fluid under pressure, comprising a control valve for controlling the flow of hydraulic fluid to the hydraulic clutch, said control valve having a longitudinal axis and being rotatably movable about its longitudinal axis and independently reciprocally movable along its longitudinal axis, a first means operable by hand and a second means operable by the brake pedal for moving said control valve, one of said means operable to move said control valve to a neutral position with respect to the hydraulic clutch and to a clutch-operating position and the other of said means operable to move said control valve from any one of the positions established by the one means to a second neutral position with respect to the hydraulic clutch and to return the control valve to its first position when rendered inoperable; each of said means being independently operable.
Claim 2
Dependent Claim
170 words
A transmission control device including a hydraulic clutch for a self-propelled vehicle having a brake pedal in which the hydraulic clutch may be engaged, disengaged or partially engaged by hydraulic fluid under pressure, comprising a control valve for controlling the flow of hydraulic fluid to the hydraulic clutch, said control valve having a longitudinal axis and being rotatably movable about its longitudinal axis and independently reciprocally movable along its longitudinal axis, a first means operable by hand and a second means operable by the brake pedal for moving said control valve, one of said means operable to move said control valve to a neutral position with respect to the hydraulic clutch and to a clutch-operating position and the other of said means operable to move said control valve from any one of the positions established by the one means to a second neutral position with respect to the hydraulic clutch and to return the control valve to its first position when rendered inoperable; each of said means being independently operable.
Claim 3
Dependent Claim
38 words
A transmission control device as claimed in claim 1 wherein said first hand-operated means moves said control valve reciprocally along its longitudinal axis, and wherein said second brake-operated means moves said control valve rotatable about its longitudinal axis.
Claim 4
Dependent Claim
35 words
A transmission control device as claimed in claim 2 wherein said control valve includes flange means thereon for engagement with said hand-operated means and further includes axial splines thereon for engagement with said brake-operated means.
Claim 5
Dependent Claim
31 words
A transmission control device as claimed in claim 2 and further comprising spring-loaded ball means for positively locating the longitudinal position of said control valve when operated by said hand-operated means.
Claim 6
Dependent Claim
24 words
A transmission control device as claimed in claim 4 wherein said control valve is provided with circular grooves to cooperate with said ball means.
Claim 7
Dependent Claim
78 words
A transmission control device as claimed in claim 2 wherein a cylindrical portion of said control valve is provided with an axially extending recess for controlling flow of the hydraulic fluid to the hydraulic clutch when moved axially and wherein said portion of the control valve is provided with at least one longitudinal flat surface adjacent the recess in said control valve for establishing the second neutraL position when said control valve is rotated about its longitudinal axis.
Claim 8
Dependent Claim
38 words
A transmission control device as claimed in claim 1 wherein said first hand-operated means moves said control valve rotatably about its longitudinal axis and wherein said second brake-operated means moves said control valve reciprocally along its longitudinal axis.
Claim 9
Dependent Claim
35 words
A transmission control device as claimed in claim 7 wherein said control valve includes flange means thereon for engagement with said brake-operated means and further includes axial splines thereon for engagement with said hand-operated means.
Claim 10
Dependent Claim
67 words
A transmission control device as claimed in claim 7 wherein a cylindrical portion of said control valve is provided with a recess for controlling flow of the hydraulic fluid to the hydraulic clutch when said control valve is rotated about its axis and is further provided with an annular groove spaced from the recess for establishing the second neutral position when said control valve is moved axially.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |