Highway intersection warning system
Abstract
Abstract AN INTERSECTION WARNING SYSTEM WHEREIN A PAIR OF SPACEDAPART TREADLE-TYPE SWITCHES ARE DISPOSED IN ONE OF THE ROADS. THE FIRST SWITCH IS ELECTRICALLY ARRANGED TO ACTIVATE A LIGHT WARNING SYSTEM ON BOTH ROADS. THIS IS INACTIVATED WHEN THE INTERSECTION IS CLEAR AND THE VEHICLE PASSES OVER THE SECOND TREADLE. WHEN ADAPTED TO AN EXIT RAMP THE TWO SWITCHES ACTIVATE TIME DELAY RELAYS SO THAT WHEN THE VEHICLE PASSES OVER THE SECOND SWITCH WITHIN A SELECTABLE TIME THE WARNING SYSTEM DOES NOT OPERATE. HOWEVER, WHEN THE VEHICLE IS DELAYED OR SLOWED THE WARNING SYSTEM OPERATES. ONE SET OF TREADLES IS DISPOSED AT THE RAMP TERMINAL AND THE OTHER PROXIMATE THE RAMP ENTRANCE. WHERE AN AUTOMOBILE ATTEMPTS TO ENTER THE EXIT RAMP IN THE WRONG DIRECTION THE SECOND SWITCH IS TRIPPED AND THE ALARM ACTIVATED. THE WARNING SYSTEM CONSISTS OF LAMPS CARRIED ON POLES ALONG THE RAMP. THE ENTRANCE TREADLES ACTIVATE WARNING LIGHTS ALONG THE HIGHWAY TO INFORM ONCOMING MOTORISTS OF THE RAMP CONDITION.
Inventors
- 👤 John Jospeh Davin
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |