US4281311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for increasing effective light intensity of a rotating light
Assignee: Federal Signal Corp
•
Filing: 1979-06-07
•
Granted: 1981-07-28
•
Expires: 1999-06-07
Abstract
Abstract A rotating signal light for use on police cars, ambulances and other vehicles on which a warning light is required, the light being driven at a non-uniform speed of rotation for the purpose of enhancing light intensity in certain predetermined directions and reducing light intensity in other directions.
Inventors
- 👤 Earl W. Gosswiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:51
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/2611
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A rotatable signal light assembly comprising, in combination, a lamp mounted for rotation for producing light flashes in a plurality of different directions during a complete revolution of the lamp, and drive means for rotating said lamp at a non-uniform rate of speed which changes at least twice during said complete revolution to produce at least two different rates of speed during said revolution, said drive means including means effecting a reduced rate of motion when said lamp is aimed in a predetermined direction where it is desired to provide a light flash of increased intensity, said drive means including a variable speed drive motor, and means for varying the speed of said motor during a complete revolution of said lamp by varying the electrical power supplied to said motor, said means for varying the electrical power supplied to said motor comprising segmented collector ring means providing at least two alternate circuits between an electrical power source and said electric motor, each of said alternate circuits being operative during a selected respective portion of one complete revolution of said lamp.
Claim 2
Dependent Claim
180 words
A rotatable signal light assembly comprising, in combination, a lamp mounted for rotation for producing light flashes in a plurality of different directions during a complete revolution of the lamp, and drive means for rotating said lamp at a non-uniform rate of speed which changes at least twice during said complete revolution to produce at least two different rates of speed during said revolution, said drive means including means effecting a reduced rate of motion when said lamp is aimed in a predetermined direction where it is desired to provide a light flash of increased intensity, said drive means including a variable speed drive motor, and means for varying the speed of said motor during a complete revolution of said lamp by varying the electrical power supplied to said motor, said means for varying the electrical power supplied to said motor comprising segmented collector ring means providing at least two alternate circuits between an electrical power source and said electric motor, each of said alternate circuits being operative during a selected respective portion of one complete revolution of said lamp.
References Cited (Backward Citations)
US2096755A
Cited
US1100748A
Cited
US1561266A
Cited
US1442543A
Cited
US2008408A
Cited
US3133263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |