US3944295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Towing valve arrangement for fail-safe brake system
Assignee: Caterpillar Inc
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Filing: 1975-01-30
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Granted: 1976-03-16
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Expires: 1995-01-30
Abstract
Abstract A brake system having spring applied fluid pressure released brakes is provided with an auxiliary source of pressure for release of the brakes and a valve that is locked into an inoperative position effective to thereby render it tamper-proof.
Inventors
- 👤 Michael K. Lloyd
- 👤 Paul C. Rosenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:46
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/22; B60T17/00; B60T17/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
A vehicle brake control system having spring applied brake means and fluid pressure responsive release means; a brake control valve for controlling said brakes; a primary source of fluid pressure for controlling said brakes; an auxiliary source of fluid pressure for controlling said brakes upon failure of said primary source; an auxiliary control valve comprising a valve body, a valve spool reciprocably mounted in said valve body and movable between a communicating position and a noncommunicating position, for controlling communication of said auxiliary source with said control valve, both ends of said valve extending from said valve body; and, locking means including a bracket operative to engage both ends of said spool and adapted to be secured in a fixed position to block movement of said spool to said communicating position.
Claim 2
Dependent Claim
131 words
A vehicle brake control system having spring applied brake means and fluid pressure responsive release means; a brake control valve for controlling said brakes; a primary source of fluid pressure for controlling said brakes; an auxiliary source of fluid pressure for controlling said brakes upon failure of said primary source; an auxiliary control valve comprising a valve body, a valve spool reciprocably mounted in said valve body and movable between a communicating position and a noncommunicating position, for controlling communication of said auxiliary source with said control valve, both ends of said valve extending from said valve body; and, locking means including a bracket operative to engage both ends of said spool and adapted to be secured in a fixed position to block movement of said spool to said communicating position.
Claim 3
Dependent Claim
23 words
The brake control system of claim 1 wherein said bracket is slidable between two extreme positions to define said communicating and non-communicating positions.
Claim 4
Dependent Claim
20 words
The brake control system of claim 2 wherein said bracket is a U-shaped bracket engaging both ends of said spool.
Claim 5
Dependent Claim
129 words
A fluid control system for operating a fluid responsive motor; a main control valve for controlling said motor; a primary source of fluid pressure for operating said motor; an auxiliary source of fluid pressure for operating said motor upon failure of said primary source; an auxiliary control valve comprising a valve body, a valve spool reciprocably mounted in said valve body and movable between a communicating position and a noncommuicating position for controlling communication of said auxiliary source with said control valve, said valve spool having both ends extending from said valve body; and, locking means including a bracket, said bracket being operative to engage both ends of said spool and adapted to be secured in a fixed position to block movement of said spool to said communicating positon.
Claim 6
Dependent Claim
129 words
A fluid control system for operating a fluid responsive motor; a main control valve for controlling said motor; a primary source of fluid pressure for operating said motor; an auxiliary source of fluid pressure for operating said motor upon failure of said primary source; an auxiliary control valve comprising a valve body, a valve spool reciprocably mounted in said valve body and movable between a communicating position and a noncommuicating position for controlling communication of said auxiliary source with said control valve, said valve spool having both ends extending from said valve body; and, locking means including a bracket, said bracket being operative to engage both ends of said spool and adapted to be secured in a fixed position to block movement of said spool to said communicating positon.
Claim 7
Dependent Claim
23 words
The brake control system of claim 4 wherein said bracket is slidable between two extreme positions to define said communicating and non-communicating positions.
Claim 8
Dependent Claim
20 words
The brake control system of claim 5 wherein said bracket is a U-shaped bracket engaging both ends of said spool.
Claim 9
Dependent Claim
108 words
A safety control valve for operating a fluid system comprising: a control valve having a communicating position and a noncommunicating position; a control valve comprising a valve body, a valve spool reciprocably mounted in said valve body and movable between a communicating position and a noncommunicating position, for controlling communication of fluid from a source, said valve spool extending from both ends of said valve body; and, locking means including a bracket, said bracket being operative to engage both ends of said spool and adapted to be secured in a fixed position to block movement of said spool from a selected one of said communicating and noncommunicating positions.
Claim 10
Dependent Claim
108 words
A safety control valve for operating a fluid system comprising: a control valve having a communicating position and a noncommunicating position; a control valve comprising a valve body, a valve spool reciprocably mounted in said valve body and movable between a communicating position and a noncommunicating position, for controlling communication of fluid from a source, said valve spool extending from both ends of said valve body; and, locking means including a bracket, said bracket being operative to engage both ends of said spool and adapted to be secured in a fixed position to block movement of said spool from a selected one of said communicating and noncommunicating positions.
Claim 11
Dependent Claim
22 words
The control valve of claim 7 wherein said bracket is slidable between two extreme positions to define said communicating and non-communicating positions.
Claim 12
Dependent Claim
19 words
The control valve of claim 8 wherein said bracket is a U-shaped bracket engaging both ends of said spool.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |