Patent US3565220A successfully refreshed from Google Patents.
US3565220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A transmission neutralizer operated by service and parking brakes
Assignee: Caterpillar Inc
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Filing: 1969-09-02
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Granted: 1971-02-23
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Expires: 1989-09-02
Abstract
Abstract A control system for a vehicle having air-actuated service brakes, air-actuated parking brakes and a hydraulically actuated power transmission is provided with a common interconnection between both sets of brakes and the transmission so that the transmission may be quickly neutralized when either set of brakes is applied. The system also includes a warning means associated with the parking brakes and means for allowing the operator of the vehicle to override the warning means.
Inventors
- 👤 Edward J Lammers
- 👤 George E Schubert
- 👤 Thomas F Teter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:29
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/103; B60T17/00; B60T17/18; B60T17/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
In a vehicle which has air-actuated service brakes, airactuated parking brakes, and a hydraulically actuated power transmission; means including a source of air under pressure; first valve means for controlling air supply from the air source to the service brakes; second valve means for controlling air supply from the air source to the parking brakes; booster valve means operable to communicate air supply from the air source to a transmission neutralizer valve; said transmission neutralizer valve operable, when actuated by the booster valve, to disengage the transmission; said first valve means having a first interconnection with the booster valve whereby operation of the first valve means to apply the service brakes causes the booster valve to communicate air supply to the transmission neutralizer value to thereby neutralize the transmission; and said second valve means having a second interconnection with the booster valve whereby operation of the second valve means to apply the parking brakes causes the booster valve to communicate air supply to the transmission to the neutralizer valve to thereby neutralize the transmission.
Claim 2
Dependent Claim
174 words
In a vehicle which has air-actuated service brakes, airactuated parking brakes, and a hydraulically actuated power transmission; means including a source of air under pressure; first valve means for controlling air supply from the air source to the service brakes; second valve means for controlling air supply from the air source to the parking brakes; booster valve means operable to communicate air supply from the air source to a transmission neutralizer valve; said transmission neutralizer valve operable, when actuated by the booster valve, to disengage the transmission; said first valve means having a first interconnection with the booster valve whereby operation of the first valve means to apply the service brakes causes the booster valve to communicate air supply to the transmission neutralizer value to thereby neutralize the transmission; and said second valve means having a second interconnection with the booster valve whereby operation of the second valve means to apply the parking brakes causes the booster valve to communicate air supply to the transmission to the neutralizer valve to thereby neutralize the transmission.
Claim 3
Dependent Claim
72 words
Apparatus as set forth in claim 1 wherein operation of the first valve means to disengage the service brakes causes the booster valve to block air supply to the transmission neutralizer valve whereby the neutralizer valve reengages the transmission, and wherein operation of the second valve means to disengage the parking brakes causes the booster valve to block air supply to the transmission neutralizer valve, whereby the neutralizer valve reengages the transmission.
Claim 4
Dependent Claim
89 words
Apparatus as set forth in claim 1 and further including warning means located in the cab of the vehicle and operably associated with the second valve means and the parking brakes, said warning means including an air pressure operated switch which actuates the warning means when the air supply pressure to the parking brakes drops below a predetermined level, and manually operable valve means for controlling air supply from the air source to the pressure switch to thereby allow the operator of the vehicle to override the warning means.
Claim 5
Dependent Claim
35 words
Apparatus as set forth in claim 3 wherein the last mentioned manually operable valve includes means interconnected with the transmission for disengaging the transmission when the manual valve is operated to override the warning 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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |