US3589484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parking brake control system
Assignee: Caterpillar Inc
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Filing: 1969-07-16
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Granted: 1971-06-29
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Expires: 1989-07-16
Abstract
Abstract A control system for a vehicle having a parking brake and a transmission is provided with a valve arrangement which automatically places the transmission in a neutral condition when the parking brake is engaged.
Inventors
- 👤 Edward J Lammers
- 👤 Thomas F Teter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:54
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/103; F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F16H63/3026; F16H2063/3033; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
In a system for a vehicle having a transmission, an air controlled parking brake and an air actuated neutralizer valve means for automatically engaging and disengaging the transmission, the combination comprising: a source of air under pressure; manually operable valve means movable to a first position which blocks air from the parking brake and permits mechanical means associated with the parking brake to automatically engage the parking brake, said manually operable valve means simultaneously directing air to the neutralizer valve means to disengage the transmission; said manually operable valve means movable to a second position to direct air under pressure to the parking brake to overcome the mechanical means and disengage the parking brake, said manually operable valve means simultaneously exhausting air from the neutralizer valve means to thereby allow said neutralizer valve means to automatically move to a transmission engaging position.
Claim 2
Dependent Claim
142 words
In a system for a vehicle having a transmission, an air controlled parking brake and an air actuated neutralizer valve means for automatically engaging and disengaging the transmission, the combination comprising: a source of air under pressure; manually operable valve means movable to a first position which blocks air from the parking brake and permits mechanical means associated with the parking brake to automatically engage the parking brake, said manually operable valve means simultaneously directing air to the neutralizer valve means to disengage the transmission; said manually operable valve means movable to a second position to direct air under pressure to the parking brake to overcome the mechanical means and disengage the parking brake, said manually operable valve means simultaneously exhausting air from the neutralizer valve means to thereby allow said neutralizer valve means to automatically move to a transmission engaging position.
Claim 3
Independent Claim
225 words
A system for a vehicle having a parking brake, a transmission and a neutralizer valve means which neutralizer valve means may be actuated by air pressure to automatically place the transmission in a neutral condition, the combInation comprising: a source of air under pressure; a load cylinder having a spring normally urging a first face of a piston in a first direction to engage a parking brake; first conduit means interconnecting the air source and the load cylinder; manually operable first valve means movable to a first position which communicates air pressure through the first conduit to a second face of the piston in the load cylinder to overcome the load cylinder spring force and move the piston in a second direction which disengages the parking brake; said first valve means movable to a second position which blocks fluid communication between the air source and the load cylinder, thereby permitting the load cylinder spring to move the piston in a direction which engages the parking brake; inversion valve means in communication with both the first valve means and the neutralizer valve means; and said inversion valve means operable to supply air to the neutralizer valve means when the first valve means is in said second position and to exhaust air from the neutralizer valve means when the first valve means is in the first position.
Claim 4
Independent Claim
225 words
A system for a vehicle having a parking brake, a transmission and a neutralizer valve means which neutralizer valve means may be actuated by air pressure to automatically place the transmission in a neutral condition, the combInation comprising: a source of air under pressure; a load cylinder having a spring normally urging a first face of a piston in a first direction to engage a parking brake; first conduit means interconnecting the air source and the load cylinder; manually operable first valve means movable to a first position which communicates air pressure through the first conduit to a second face of the piston in the load cylinder to overcome the load cylinder spring force and move the piston in a second direction which disengages the parking brake; said first valve means movable to a second position which blocks fluid communication between the air source and the load cylinder, thereby permitting the load cylinder spring to move the piston in a direction which engages the parking brake; inversion valve means in communication with both the first valve means and the neutralizer valve means; and said inversion valve means operable to supply air to the neutralizer valve means when the first valve means is in said second position and to exhaust air from the neutralizer valve means when the first valve means is in the first position.
Claim 5
Dependent Claim
221 words
In a system for a vehicle having a parking brake, a transmission and a neutralizer valve means which neutralizer valve means may be actuated by air pressure to automatically place the transmission in a neutral condition, the combination comprising: a source of air pressure; a load cylinder having a spring-actuated piston for engaging a parking brake; first conduit means communicating the source of air with an opposite side of the spring-actuated piston; first valve means in said first conduit means normally open to permit air pressure from the source to overcome the spring bias and move the piston to maintain the parking brake in a released condition; second valve means in communication with the first valve means and operable to prevent air pressure from the source from actuating the neutralizer valve means when the first valve means is in an open condition; manual means for closing the first valve means to prevent communication of air pressure from the source to the spring-biased piston and thereby permitting the spring to move the piston and engage the parking brake; said second valve means operable in response to closing of the first valve means to communicate air pressure from the source to the neutralizer valve means whereby the transmission of the vehicle is placed in a neutral condition when the parking brake is engaged.
Claim 6
Dependent Claim
221 words
In a system for a vehicle having a parking brake, a transmission and a neutralizer valve means which neutralizer valve means may be actuated by air pressure to automatically place the transmission in a neutral condition, the combination comprising: a source of air pressure; a load cylinder having a spring-actuated piston for engaging a parking brake; first conduit means communicating the source of air with an opposite side of the spring-actuated piston; first valve means in said first conduit means normally open to permit air pressure from the source to overcome the spring bias and move the piston to maintain the parking brake in a released condition; second valve means in communication with the first valve means and operable to prevent air pressure from the source from actuating the neutralizer valve means when the first valve means is in an open condition; manual means for closing the first valve means to prevent communication of air pressure from the source to the spring-biased piston and thereby permitting the spring to move the piston and engage the parking brake; said second valve means operable in response to closing of the first valve means to communicate air pressure from the source to the neutralizer valve means whereby the transmission of the vehicle is placed in a neutral condition when the parking brake is engaged.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |