Patent US4306230A successfully refreshed from Google Patents.
Patent US3118520A successfully refreshed from Google Patents.
US3118520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for automatic regulation of air-gap and spring force in brakes
Assignee: Individual
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Filing: 1960-11-28
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Granted: 1964-01-21
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Expires: 1980-11-28
Abstract
No abstract record available.
Inventors
- 👤 Tjernstrom Ove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:26
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/72; F16D65/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
IN A BRAKE HAVING A SHOE MEMBER, A STATIONARY MEMBER AND A BRAKE WHEEL, MEANS FORMING A BRAKE CYLINDER HAVING AN ABUTMENT PORTION, A FIRST PISTON SLIDABLE IN SAID CYLINDER, A SECOND PISTON SLIDABLE WITHIN THE FIRST PISTON, ONE OF SAID MEMBERS BEING RIGID WITH THE CYLINDER FORMING MEANS AND THE OTHER OPERATIVELY CONNECTED WITH SAID SECOND PISTON, THE FIRST PISTON HAVING FIRST AND SECOND BORES THEREIN AND THE SECOND PISTON HAVING TWO ADJACENT PORTIONS OF DIFFERENT DIAMETERS AND A SHOULDER CONNECTING SAID PORTIONS, ONE OF SAID PORTIONS BEING WITHIN AND OF LESS CROSS-SECTION THAN THE CORRESPONDING PORTION OF THE FIRST BORE SO AS TO PROVIDE A SPACE WITHIN THE FIRST BORE OUTSIDE SUCH PORTION, SAID FIRST PISTON HAVING A PORTION SLIDABLY ENGAGING THE SECOND PISTON ON THE SIDE OF SAID SPACE REMOTE FROM THE SECOND BORE IN THE FIRST PISTON, THE OTHER PORTION OF THE SECOND PISTON FITTING SLIDABLY IN THE SECOND BORE OF THE FIRST PISTON, FIRST SPRING MEANS ENGAGING THE FIRST PISTON AND URGING IT IN A DIRECTION TO MOVE THE SECOND PISTON, BY ACTION ON THE SHOULDER OF THE SECOND PISTON OF A PRESSURE MEDIUM CONTAINED IN SAID SPACE, TO
Claim 2
Dependent Claim
194 words
IN A BRAKE HAVING A SHOE MEMBER, A STATIONARY MEMBER AND A BRAKE WHEEL, MEANS FORMING A BRAKE CYLINDER HAVING AN ABUTMENT PORTION, A FIRST PISTON SLIDABLE IN SAID CYLINDER, A SECOND PISTON SLIDABLE WITHIN THE FIRST PISTON, ONE OF SAID MEMBERS BEING RIGID WITH THE CYLINDER FORMING MEANS AND THE OTHER OPERATIVELY CONNECTED WITH SAID SECOND PISTON, THE FIRST PISTON HAVING FIRST AND SECOND BORES THEREIN AND THE SECOND PISTON HAVING TWO ADJACENT PORTIONS OF DIFFERENT DIAMETERS AND A SHOULDER CONNECTING SAID PORTIONS, ONE OF SAID PORTIONS BEING WITHIN AND OF LESS CROSS-SECTION THAN THE CORRESPONDING PORTION OF THE FIRST BORE SO AS TO PROVIDE A SPACE WITHIN THE FIRST BORE OUTSIDE SUCH PORTION, SAID FIRST PISTON HAVING A PORTION SLIDABLY ENGAGING THE SECOND PISTON ON THE SIDE OF SAID SPACE REMOTE FROM THE SECOND BORE IN THE FIRST PISTON, THE OTHER PORTION OF THE SECOND PISTON FITTING SLIDABLY IN THE SECOND BORE OF THE FIRST PISTON, FIRST SPRING MEANS ENGAGING THE FIRST PISTON AND URGING IT IN A DIRECTION TO MOVE THE SECOND PISTON, BY ACTION ON THE SHOULDER OF THE SECOND PISTON OF A PRESSURE MEDIUM CONTAINED IN SAID SPACE, TO
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) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |