Rotating signal light with variable voltage lamp circuit
AssigneeFederal Signal Corporation
InventorEarl W. Gosswiller
Life of this patent
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Abstract
A rotating signal light for use on police cars, ambulances and other vehicles on which a warning light is required, the light being connected with a variable voltage lamp circuit which provides a higher voltage in predetermined rotational positions of the lamp to produce enhanced light in certain directions while providing a lower voltage in other positions of the light to increase lamp life and reduce wattage requirements.
Claims6
A rotatable signal light assembly for use on emergency vehicles comprising, in combination, a lamp mounted for rotation about a generally upright axis for producing light flashes in a plurality of generally radial directions during each 360 degree lamp revolution, drive means for rotating said lamp at a substantially uniform rate of speed, and voltage control means operative during each said revolution to provide increased lamp voltage during a first predetermined portion of said revolution and reduced lamp voltage during a second predetermined portion of said revolution, thereby to produce increased intensity light flashes when said lamp is aimed in predetermined radial directions corresponding to said first predetermined portion of said revolution and light flashes of lesser intensity when said lamp is aimed in other radial directions corresponding to said second predetermined portion of said revolution.
Dependencies are inferred from the claim text.