US3203512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic drum brake
Assignee: Valeo SE
•
Filing: 1963-02-08
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Granted: 1965-08-31
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Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Lepelletier Pierre Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:45
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/22; B; B60; B60T; B60T11/00; B60T11/10; B60T11/24; F16D65/38; F16D65/40; F16D65/42; F16D65/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A HYDRAULIC DRUM BRAKE COMPRISING GRIPPING SHOES WHICH ARE ADAPTED TO COME INTO FRICTIONAL CONTACT WITH A ROTATING DRUM WHEN THEY ARE SUBJECTED TO EXPANSION, AND WHICH ARE GUIDED WITH RESPECT TO A FIXED SUPPORT INCORPORATING THE BRAKE- PLATE WHEN THEY ARE SUBJECTED TO ELASTIC FORCES TENDING TO RETURN THEM TOWARDS A DEFINED POSITION OF REST, IN WHICH SAID SHOES CO-OPERATE WITH TWO PISTONS SLIDING RESPECTIVELY IN TWO COAXIAL BORES WHICH ARE FORMED IN A CYLINDER AND OF WHICH ONE HAS A LARGER DIAMETER THAN THE OTHER, THE LARGE PISTON HAVING A TAIL-ROD ENCLOSED BY A MOVABLE RING WHICH IS AXIALLY SLIDABLE RELATIVE TO SAID TAIL-ROD AND WHICH IS ENGAGED IN AND AXIALLY SLIDABLE RELATIVE TO THE SMALL BORE, A PRIMARY CHAMBER COUPLED TO A FLUID-PRESSURE CIRCUIT BEING DEFINED IN SAID SMALL BORE BY THE SMALL PISTON, THE TAIL-ROD OF SAID LARGE PISTON, AND SAID RING, WHILE A SECONDARY CHAMBER COUPLED TO ANOTHER FLUIDPRESSURE CIRCUIT IS DEFINED IN SAID LARGE BORE BY THE LARGE PISTON AND SAID RING.
Claim 2
Dependent Claim
168 words
A HYDRAULIC DRUM BRAKE COMPRISING GRIPPING SHOES WHICH ARE ADAPTED TO COME INTO FRICTIONAL CONTACT WITH A ROTATING DRUM WHEN THEY ARE SUBJECTED TO EXPANSION, AND WHICH ARE GUIDED WITH RESPECT TO A FIXED SUPPORT INCORPORATING THE BRAKE- PLATE WHEN THEY ARE SUBJECTED TO ELASTIC FORCES TENDING TO RETURN THEM TOWARDS A DEFINED POSITION OF REST, IN WHICH SAID SHOES CO-OPERATE WITH TWO PISTONS SLIDING RESPECTIVELY IN TWO COAXIAL BORES WHICH ARE FORMED IN A CYLINDER AND OF WHICH ONE HAS A LARGER DIAMETER THAN THE OTHER, THE LARGE PISTON HAVING A TAIL-ROD ENCLOSED BY A MOVABLE RING WHICH IS AXIALLY SLIDABLE RELATIVE TO SAID TAIL-ROD AND WHICH IS ENGAGED IN AND AXIALLY SLIDABLE RELATIVE TO THE SMALL BORE, A PRIMARY CHAMBER COUPLED TO A FLUID-PRESSURE CIRCUIT BEING DEFINED IN SAID SMALL BORE BY THE SMALL PISTON, THE TAIL-ROD OF SAID LARGE PISTON, AND SAID RING, WHILE A SECONDARY CHAMBER COUPLED TO ANOTHER FLUIDPRESSURE CIRCUIT IS DEFINED IN SAID LARGE BORE BY THE LARGE PISTON AND SAID RING.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |