US3622207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic translating and valving unit
Assignee: SPX Technologies Inc
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Filing: 1970-06-25
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Granted: 1971-11-23
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Expires: 1990-06-25
Abstract
Abstract The disclosure concerns hydraulic translating and valving mechanisms particularly suited for use on railway cars to join a single set of hydraulically operated brake cylinders with both handbrake and service brake circuits. Each mechanism affords slack-compensating action to the handbrake, allows either brake to be cycled regardless of whether the other is applied or released, and prevents unintentional release of a handbrake application as a result of operation of the service brake circuit.
Inventors
- 👤 Thomas H Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:40
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/16; B60T11/00; B60T11/10; B60T13/00; B60T13/10; B60T13/24; B60T13/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
229 words
Hydraulic translating and valving mechanism for use in joining a brake cylinder with service and hand brake circuits and comprising a. a cylinder (28) containing a reciprocable piston (29) which divides it into two working spaces (31,32) and has equal and opposed reaction areas subject to the pressures in said spaces; b. a bypass passage (37) interconnecting the working spaces and containing check valves means (39,41 or 48,49,53) for blocking flow from the second (32) to the first (31) space but permitting flow in the reverse direction upon the development of a predetermined differential between the pressures in said spaces; c. spring means (33) biasing the piston (20) in the direction of the first working space (31); d. first and second fluid transfer passages (35,36) adapted to connect the handbrake circuit and the brake cylinder in continuous communication with the first and second working spaces, respectively; e. a third fluid transfer passage (43) adapted to connect the service brake circuit with the second working space (32) through a shutoff valve (29,44) which is normally open but is closed by the piston (29) when the latter reaches a predetermined point in its travel toward the second working space (32); and f. means, including a chEck valve (47), for allowing flow from the third fluid transfer passage (43) to the second such passage (36) when the shutoff valve (29,44) is closed.
Claim 2
Dependent Claim
229 words
Hydraulic translating and valving mechanism for use in joining a brake cylinder with service and hand brake circuits and comprising a. a cylinder (28) containing a reciprocable piston (29) which divides it into two working spaces (31,32) and has equal and opposed reaction areas subject to the pressures in said spaces; b. a bypass passage (37) interconnecting the working spaces and containing check valves means (39,41 or 48,49,53) for blocking flow from the second (32) to the first (31) space but permitting flow in the reverse direction upon the development of a predetermined differential between the pressures in said spaces; c. spring means (33) biasing the piston (20) in the direction of the first working space (31); d. first and second fluid transfer passages (35,36) adapted to connect the handbrake circuit and the brake cylinder in continuous communication with the first and second working spaces, respectively; e. a third fluid transfer passage (43) adapted to connect the service brake circuit with the second working space (32) through a shutoff valve (29,44) which is normally open but is closed by the piston (29) when the latter reaches a predetermined point in its travel toward the second working space (32); and f. means, including a chEck valve (47), for allowing flow from the third fluid transfer passage (43) to the second such passage (36) when the shutoff valve (29,44) is closed.
Claim 3
Dependent Claim
46 words
The mechanism defined in claim 1 in which the shutoff valve comprises a circumferential series of ports (44) opening into the second working space (32) through a wall of the cylinder (28) and which are positioned to be overtraveled and thereby closed by the piston (29).
Claim 4
Dependent Claim
74 words
The mechanism defined in claim 1 in which a. the bypass passage (37) extends longitudinally through the piston (29); and b. the check valve means is a ball-type check valve (39) in the piston (29) and provided with a biasing spring (41) which holds it closed at differentials between the pressures in said spaces (31,32) below that required to move the piston (29) to the position in which it closes the shutoff valve (29,44).
Claim 5
Dependent Claim
90 words
The mechanism defined in claim 1 in which the check valve means comprises a. a pair of reversely set check valves (48,49) arranged in series in the bypass passage (37), b. the check valve (48) located nearer the first working space (31) being adapted to open at a pressure differential materially smaller than said predetermined differential, and c. the other check valve (49) being arranged to be opened by a stationary mechanical actuator (53) after the piston (29) reaches said predetermined point in its travel toward the second space (32).
Claim 6
Dependent Claim
35 words
The mechanism defined in claim 4 in which a. both check valves (48,49) are of the ball type; and b. these check valves (48,49) are biased closed by a common spring (51) located between them.
Claim 7
Dependent Claim
166 words
The mechanism defined in claim 2 in which a. the piston (29) is provided with a pair of longitudinally spaced, resilient sealing members (46,47) which engage the cylinder (28) around its entire circumference and thereby inhibit leakage from either of said spaces (31,32) to the other space across the piston; b. said series of ports (44) registers with a clearance space (45) between the piston and the cylinder located between said sealing members when the shutoff valve is closed; and c. at least the sealing member (47) disposed adjacent the second working space (32) is a flexible packing which bears against the cylinder and permits flow from the clearance space (45) to said second working space (32) but precludes flow in the reverse direction, d. whereby the ports (44), the clearance space (45), the flexible packing (47) and the second working space (32) constitute said means for allowing flow from the third (43) to the second (36) fluid transfer passage when the shutoff valve is closed.
References Cited (Backward Citations)
US3508794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |