Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Multiple filament load devices
Patent
1998-07-13
2000-04-25
Wong, Don
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Multiple filament load devices
315 64, 315 65, H01J 744
Patent
active
060548126
DESCRIPTION:
BRIEF SUMMARY
(2) CROSS REFERENCED APPLICATIONS
The following prior art disclosures relate to the same field of invention.
(3) BACKGROUND TO THE INVENTION
A filament type light bulb only has a certain lifespan. Once the filament has become worn away in response to continuous use, it breaks thus rendering the bulb defective and of no use any more. At this time the bulb, except for the filament, is normally still intact but has to be disposed of The object of this invention is thus to provide a light bulb which can be re-used thus lengthening its useful lifespan.
(3.1) FIELD OF THE INVENTION
This invention relates to an electric current utilising facility connectable to an electric current supply outlet for causing the conduction of current along a desired circuit along the facility in response to manipulation of the facility. Although not so limited, he invention finds useful application when applied to a multiple use filament type light bulb.
(3.2) PRIOR ART DESCRIPTION
Multi-filament light bulbs are known in the art. Various approaches of changing between the filaments have been suggested. According to one arrangement, another filament is caused to become electrically connected by the base of the lamp being formed with a plurality of suitably isolated foldable contact members with a further contact member becoming exposed on folding away the contact member of the defective filament. (U.S. Pat. No. 3,673,534).
(4) SUMMARY OF THE INVENTION
According to the invention there is provided an electric current utilising facility conventionally connectable to an electric current supply outlet for causing the diversion of current along a desired circuit in response to manipulation of the facility.
(5) BRIEF DESCRIPTION OF THE DRAWING
The invention is now described, by way of example, with reference to the accompanying drawings. In the drawings
FIG. 1 three dimensionally shows one embodiment of an electric current utilising facility in the form of a light bulb,
FIG. 2 shows another embodiment of the light bulb of the invention in side elevation, and
FIG. 3 three dimensionally shows an adapter, according to the invention by means of which a bayonet type light bulb is connectable to a screw in socket type outlet.
(6) DETAILED DESCRIPTION OF THE DRAWINGS
Referring to FIG. 1 of the drawings, one embodiment of an electric current utilising facility in the form of a re-usable light bulb is generally indicated by reference numeral 10. The bulb 10 comprises a circuit carrying device in the form of a globe 12 fitted with a number of independent filament circuits 14, and a circuit selecting mechanism providing a swivellable member firmly securable to a matchingly formed current supply outlet as provided by a sleeve 16 which snugly but freely swivellably in the direction of arrow 17 sits onto the stem 18 of the globe 12 while being retained against slipping owing to the stem 18 providing a ridge 20 on its socket engaging side. The sleeve 16 is fitted with pins 22 enabling the bayonet coupling engagement of the bulb 10 to a conventional light bulb socket outlet.
Each circuit 14 extends between its own contact 24, 26 and 28 and an arcuate common base contact 30 and incorporates a filament 32. The leads 34 of the circuits 14 and filaments 32 are conventionally light bulb fashion supported to also limit the possibility of short circuiting between the circuits 14. In this respect the three independent lead wires of the three filaments 32 can, for example, extend on both sides along capillary apertures along a core 36. The globe 12 is fitted with fuses 38 along each of the circuits 14.
Referring to FIG. 2 and in another embodiment of the light bulb 10, the member firmly securable to a matchingly formed current supply outlet is in this embodiment in the form of a ring 40 which snugly but freely swivellably fits along a groove 41 in the stem 18 of the globe 12. The ring 40 is fitted with pins 42 spaced to bayonet coupling fashion engage the bulb 10 to a conventional light bulb socket outlet. Like components of this embodiment are
REFERENCES:
patent: 708159 (1902-09-01), Meyers
patent: 955748 (1910-04-01), Bill et al.
patent: 982470 (1911-01-01), Camp, Jr.
patent: 1513407 (1924-10-01), Lombos
patent: 1742630 (1930-01-01), Becket
patent: 2139762 (1938-12-01), Major
patent: 2150232 (1939-03-01), Major
patent: 5345143 (1994-09-01), Little
Lee Wilson
Wong Don
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