US3881779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake anti-lock mechanism
Assignee: Echlin Inc
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Filing: 1973-05-21
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Granted: 1975-05-06
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Expires: 1993-05-21
Abstract
Abstract An electro-pneumatic control valve for use in a brake anti-lock system is provided with a relay portion for controlling fluid pressure applied to the system in response to predeterminately selected fluid pressure samples supplied thereto and an electric sampling device responsive to signals supplied thereto upon the occurrence of pre-selected conditions in the brake system for controlling the fluid pressure samples supplied to said relay portion.
Inventors
- 👤 John A Machek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:50
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/0891; B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633; B60T8/32; B60T8/34; B60T8/36; B60T8/361; B60T8/3615; B60T8/3675; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; G01P15/16; G01P3/00; G01P3/42; G01P3/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
324 words
A control valve for an anti-lock brake system comprising: a housing; relay means movable in the housing and operable generally in response to control fluid pressure subjected thereto to effect a metered application through the housing of fluid pressure supplied thereto; means for controlling the control fluid pressure subjected to the relay means comprising an electric solenoid valve energized in response to a preselected condition to isolate the control fluid pressure acting on the relay means and vent the isolated control fluid pressure, the relay means being responsive to the reduction of the control fluid pressure upon the venting thereof to effect a proportional reduction of the applied fluid pressure; a flow passage in the housing for the flow therethrough of the control fluid pressure upon the subjection thereof to the relay means; exhaust passage means in the housing corresponding to the flow passage for exhausting the control fluid pressure prior to energizing the solenoid valve; a valve seat in the housing about the flow passage; valve means for engagement with the valve seat, the valve means being movable into engagement with the valve seat to close the flow passage and isolate the control fluid pressure acting on the relay means upon the energization of the solenoid valve; other exhaust passage means in the housing for communication with the isolated control fluid pressure; another valve seat in the housing about the other exhaust passage means, the solenoid valve including other valve means for engagement with the other valve seat, the other valve means movable toward a position disengaged from the other valve seat to vent the isolated control fluid pressure through the other exhaust passage means upon the energization of the solenoid valve to engage the first named valve means with the first named valve seat; recess means in the housing constituting a portion of the flow passage, the exhaust passage, and the other exhaust passage; and a chamber connected with the recess means.
Claim 2
Dependent Claim
324 words
A control valve for an anti-lock brake system comprising: a housing; relay means movable in the housing and operable generally in response to control fluid pressure subjected thereto to effect a metered application through the housing of fluid pressure supplied thereto; means for controlling the control fluid pressure subjected to the relay means comprising an electric solenoid valve energized in response to a preselected condition to isolate the control fluid pressure acting on the relay means and vent the isolated control fluid pressure, the relay means being responsive to the reduction of the control fluid pressure upon the venting thereof to effect a proportional reduction of the applied fluid pressure; a flow passage in the housing for the flow therethrough of the control fluid pressure upon the subjection thereof to the relay means; exhaust passage means in the housing corresponding to the flow passage for exhausting the control fluid pressure prior to energizing the solenoid valve; a valve seat in the housing about the flow passage; valve means for engagement with the valve seat, the valve means being movable into engagement with the valve seat to close the flow passage and isolate the control fluid pressure acting on the relay means upon the energization of the solenoid valve; other exhaust passage means in the housing for communication with the isolated control fluid pressure; another valve seat in the housing about the other exhaust passage means, the solenoid valve including other valve means for engagement with the other valve seat, the other valve means movable toward a position disengaged from the other valve seat to vent the isolated control fluid pressure through the other exhaust passage means upon the energization of the solenoid valve to engage the first named valve means with the first named valve seat; recess means in the housing constituting a portion of the flow passage, the exhaust passage, and the other exhaust passage; and a chamber connected with the recess means.
Claim 3
Dependent Claim
199 words
A control valve according to claim 1 wherein: the solenoid valve includes a pole piece having opposed portions disposed within the recess means and the chamber; a portion of the other exhaust passage means formed in the pole piece between the recess means and chamber; coil means in the chamber about at least a portion of the pole piece; armature means movable in the coil means for magnetic holding engagement with the pole piece upon energization of the coil means for actuation of the first named and other valve means; the solenoid valve further comprises valve stem means movable in the other exhaust passage means and having opposite ends, one of the opposite ends being disposed in the recess means and carrying the first named and other valve means, the other of the opposite ends being disposed in the chamber for driven engagement with the armature means upon movement thereof. 3. A control valve according to claim 2 wherein: the first named valve seat is disposed on a wall of the recess means about the flow passage; and the other valve seat is disposed on the pole piece within the recess means and about the other exhaust passage means.
Claim 4
Dependent Claim
43 words
A control valve according to claim 1 wherein: another solenoid valve in the housing is operable to open further exhaust passage means for exhausting the isolated control fluid pressure to supplement exhausting of the control fluid pressure through the other exhaust passage 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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |