Back to results
US 4,544,996 AGranted
Underwater lighting system with grounded return line
AssigneeTivoli Industries, Inc.
InventorBenjamin B. George
Life of this patent
Estimating the term…
Abstract
Pools and spas formed with lamp house accommodating wall conformations below normal water level are fitted with a flexible tubing lamp house containing special lamps having a safety conductor ending unconnected in the interior of the lamp envelope. The lamp energizing circuits and a grounding circuit connected to the safety conductors of the lamps are disposed in the lamp house with a water insoluable, light transmitting electrical insulating material which serves to insulate the circuits and exclude water.
Claims13
A lamp comprising:
- a sealed envelope;
- a filament disposed within the envelope;
- first and second electrical conductors each extending from a point at the exterior of said envelope through said envelope and each being connected at the interior of the envelope to a respectively associated end of said filament;
- and
- a third electrical conductor extending from a point at the exterior of said envelope to the interior of said envelope to a point proximate to but separated from said first and second conductors and said filament and having no internal connection to said first or second conductor and no connection to said filament.
2 more elements
In combination:
- a plurality of lamps each comprising a sealed envelope, a filament, energizing conductors connected to said filament and extending from the interior to the exterior of the envelope, and a safety conductor unconnected to said filament or the energizing conductors and extending from the interior to said envelope to its exterior;
- an electrical power transmission line and a safety conductor line;
- means for connecting said energizing conductors in circuit with one another and said transmission line for energizing the filaments of said plurality of lamps;
- and
- means for connecting the safety conductor of each lamp of said plurality of lamps to said safety conductor line.
2 more elements
In an underwater lighting system:
- an electrical power line comprising at least two conductors and a grounded return line extending in parallel with the power line;
- at least one lamp comprising an enclosure envelope, a pair of conductors extending through said envelope, a filament connected across said pair of conductor at the interior of the enclosure;
- means for interconnecting the pair of conductors of the lamp with said power line for energizing the filaments of said lamps;
- and
- means in the form of a third electrical conductor associated with the lamp for completing an electrical circuit from said grounded return line to a point proximate to, but not in physical contact with, said pair of conductors of the lamp in the event that the envelope of the lamp is broken.
2 more elements
Dependencies are inferred from the claim text.