US3256045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor-trailer brake system
Assignee: ZF Active Safety US Inc
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Filing: 1962-06-22
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Granted: 1966-06-14
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Expires: 1982-06-22
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:51
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
IN A TRACTOR-TRAILER BRAKE SYSTEM, FLUID PRESSURE OPERATED BRAKE ACTUATORS ON THE TRACTOR AND ON THE TRAILER, MEANS COMPRISING AN ELECTRICALLY OPERABLE DEVICE FOR SUPPLYING PRESSURE, FLUID TO THE TRAILER BRAKE ACTUATOR AND INCLUDING A CIRCUIT, A CONTROLLED PRESSURE LINE, A SOURCE OF PRESSURE, A PEDAL OPERATED PRESSURE CONTROL VALVE CONNECTED BETWEEN SAID SOURCE AND SAID CONTROLLED PRESSURE LINE, A FLUID LINE CONNECTED TO THE TRACTOR BRAKE ACTUATORS, AND A SWITCH DEVICE CONNECTED IN SAID CONTROLLED PRESSURE LINE AND NORMALLY PROVIDING FOR A LIMITED FLOW OF FLUID THERETHROUGH, SAID CIRCUIT INCLUDING A NORMALLY OPEN SWITCH IN SAID SWITCH DEVICE, SAID SWITCH DEVICE HAVING A MEMBER CONNECTED TO SAID SWITCH AND SUBJECT TO THE VELOCITY OF FLUID FROM SAID CONTROLLED PRESSURE LINE, WHEN SAID VELOCITY IS ABOVE THE NORMAL RATE AT WHICH FLUID WOULD OTHERWISE FLOW THROUGH SAID SWITCH DEVICE, FOR CLOSING SAID SWITCH TO ENGERIZE SAID ELECTRICALLY OPERABLE DEVICE TO CAUSE FLUID TO BE SUPPLIED TO SAID TRAILER BRAKE ACTUATORS, SAID SWITCH DEVICE COMPRISING A BODY HAVING A CAP PROVIDED WITH A CHAMBER, SAID MEMBER CONNECTED TO SAID SWITCH COMPRISING A DIAPHRAGM FORMING ONE WALL OF SAID CHAMBER, SAID CAP HAVING AN AXIAL PORTION FORMING A SEAT NORMALLY ENGAGING SAID DIAPHRAGM, SAID SEAT AND SAID DIAPHRAGM HAV-
Claim 2
Dependent Claim
207 words
IN A TRACTOR-TRAILER BRAKE SYSTEM, FLUID PRESSURE OPERATED BRAKE ACTUATORS ON THE TRACTOR AND ON THE TRAILER, MEANS COMPRISING AN ELECTRICALLY OPERABLE DEVICE FOR SUPPLYING PRESSURE, FLUID TO THE TRAILER BRAKE ACTUATOR AND INCLUDING A CIRCUIT, A CONTROLLED PRESSURE LINE, A SOURCE OF PRESSURE, A PEDAL OPERATED PRESSURE CONTROL VALVE CONNECTED BETWEEN SAID SOURCE AND SAID CONTROLLED PRESSURE LINE, A FLUID LINE CONNECTED TO THE TRACTOR BRAKE ACTUATORS, AND A SWITCH DEVICE CONNECTED IN SAID CONTROLLED PRESSURE LINE AND NORMALLY PROVIDING FOR A LIMITED FLOW OF FLUID THERETHROUGH, SAID CIRCUIT INCLUDING A NORMALLY OPEN SWITCH IN SAID SWITCH DEVICE, SAID SWITCH DEVICE HAVING A MEMBER CONNECTED TO SAID SWITCH AND SUBJECT TO THE VELOCITY OF FLUID FROM SAID CONTROLLED PRESSURE LINE, WHEN SAID VELOCITY IS ABOVE THE NORMAL RATE AT WHICH FLUID WOULD OTHERWISE FLOW THROUGH SAID SWITCH DEVICE, FOR CLOSING SAID SWITCH TO ENGERIZE SAID ELECTRICALLY OPERABLE DEVICE TO CAUSE FLUID TO BE SUPPLIED TO SAID TRAILER BRAKE ACTUATORS, SAID SWITCH DEVICE COMPRISING A BODY HAVING A CAP PROVIDED WITH A CHAMBER, SAID MEMBER CONNECTED TO SAID SWITCH COMPRISING A DIAPHRAGM FORMING ONE WALL OF SAID CHAMBER, SAID CAP HAVING AN AXIAL PORTION FORMING A SEAT NORMALLY ENGAGING SAID DIAPHRAGM, SAID SEAT AND SAID DIAPHRAGM HAV-
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |