US3581590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for facilitating transmission shifting
Assignee: Mack Trucks Inc
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Filing: 1969-05-23
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Granted: 1971-06-01
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Expires: 1989-05-23
Abstract
Abstract A shifting apparatus for a vehicle transmission having a multiplicity of sets of gears, operator-controlled means to change the speed of rotation of the transmission countershaft prior to the completion of a gear shift operation, an electrical circuit actuated by the operator for actuating the operatorcontrolled means, and a device responsive to the speed of the countershaft to exercise control over the electrical circuit whereby a desired speed relationship may be established between the countershaft and related rotating parts prior to completion of a gear-shifting operation.
Inventors
- 👤 Irvin G Detra
- 👤 Patrick J Crowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:06
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H61/0274; F16H2708/00; F16H2708/24; F16H2708/28; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19284
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A vehicle transmission mechanism having a driving shaft, a driven shaft, a countershaft driven by the driving shaft, sets of gears between the countershaft and one of the other shafts, friction means operable to vary the speed of rotation of the countershaft, and means responsive to the speed of rotation of the countershaft to control the operation of the friction means, the means to control the friction means comprising an electrical circuit, means actuated by the circuit to operate the friction means, a switch in the circuit and operating mechanism therefor responsive to the speed of the countershaft, switches in the circuit operated by the vehicle clutch pedal and gearshifting mechanism respectively, and a switch in the circuit to bypass the speed responsive switch.
Claim 2
Dependent Claim
124 words
A vehicle transmission mechanism having a driving shaft, a driven shaft, a countershaft driven by the driving shaft, sets of gears between the countershaft and one of the other shafts, friction means operable to vary the speed of rotation of the countershaft, and means responsive to the speed of rotation of the countershaft to control the operation of the friction means, the means to control the friction means comprising an electrical circuit, means actuated by the circuit to operate the friction means, a switch in the circuit and operating mechanism therefor responsive to the speed of the countershaft, switches in the circuit operated by the vehicle clutch pedal and gearshifting mechanism respectively, and a switch in the circuit to bypass the speed responsive switch.
Claim 3
Dependent Claim
104 words
A vehicle transmission mechanism having a driving shaft, a driven shaft, a countershaft driven by the driving shaft, sets of gears between the countershaft and one of the other shafts, friction means operable to vary the speed of rotation of the countershaft, and means responsive to the speed of rotation of the countershaft to control the operation of the friction means, the friction means including brake mechanism and actuating means therefor to apply a braking force to the countershaft and a clutch mechanism between the driven shaft and countershaft and actuating means therefor to increase the speed of the countershaft by the driven shaft.
Claim 4
Dependent Claim
104 words
A vehicle transmission mechanism having a driving shaft, a driven shaft, a countershaft driven by the driving shaft, sets of gears between the countershaft and one of the other shafts, friction means operable to vary the speed of rotation of the countershaft, and means responsive to the speed of rotation of the countershaft to control the operation of the friction means, the friction means including brake mechanism and actuating means therefor to apply a braking force to the countershaft and a clutch mechanism between the driven shaft and countershaft and actuating means therefor to increase the speed of the countershaft by the driven shaft.
Claim 5
Dependent Claim
37 words
Transmission mechanism according to claim 2 wherein the means to control the operation of the friction means comprises a control circuit which includes a manually operated switch to select the operation of the brake or the clutch.
Claim 6
Dependent Claim
162 words
Transmission mechanism according to claim 2 wherein the means to control the operation of the friction means comprises a control circuit which includes two switches actuated by the speed responsive means, one connected to the brake-actuating means and one to the clutch-actuating means, and a manually operated switch to select either of the two last-named switches. 5 A vehicle transmission mechanism having a driving shaft, a driven shaft, a countershaft driven by the driving shaft, sets of gears between the countershaft and one of the other shafts, braking means for applying a braking force to the countershaft, means responsive to the speed of rotation of the countershaft to control the operation of the barking means comprising a control circuit, means actuated by the circuit to operate the braking means, first switch means in the circuit, means responsive to the speed of the countershaft to actuate the first switch means, and second switch means in the circuit for bypassing the first switch means.
Claim 7
Dependent Claim
46 words
Transmission meChanism according to claim 5 including means responsive to the gearshifting mechanism of the transmission for actuating the second switch means to bypass the first switch means when a gear set is to be engaged in order to move the vehicle from a standstill position.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |