Electric lamp and discharge devices – With envelope – Having base and connector
Reexamination Certificate
1999-10-12
2001-07-03
Day, Michael H. (Department: 2879)
Electric lamp and discharge devices
With envelope
Having base and connector
C439S615000
Reexamination Certificate
active
06255763
ABSTRACT:
TECHNICAL FIELD
This invention relates to electric bulbs and more particularly to bases therefore.
BACKGROUND ART
Electric bulbs, particularly those of the kind employing any of various sizes of Edison bases, i.e., the common threaded base, have a three-part base comprising an electrically conductive eyelet portion and an electrically conductive threaded portion separated and held together by a glass insulator. Such bases are manufactured on automatic equipment, which utilizes a glass furnace for forming the insulator and connecting the separated electrically conductive pieces. These bases are made literally by the billions each year and provide a substantial part of the cost of many light bulbs. The cost of heating and melting the glass, as well as the cost of maintaining the glass furnace contribute to the cost of the bases. Accordingly, it would be an advance in the art if a base could be produced at a lesser cost.
DISCLOSURE OF INVENTION
It is therefore, an object of the invention to obviate the disadvantages of the prior art.
It is yet another object of the invention to enhance the manufacture of bulb bases.
Still another object of the invention is the provision of a new method of making bulb bases.
Yet another object is the elimination of the glass insulator from the base.
These objects are accomplished, in one aspect of the invention by providing an insulating member for a base for a light emitting bulb which comprises an electrically insulating body formed from a thermoplastic plastic material and having a first surface, a second surface spaced therefrom, and a sidewall connecting said first and second surfaces, said sidewall being formed to flexibly receive and hold an electrically conductive element.
In another aspect of the invention, a base for a light emitting bulb comprises an electrically insulating body formed from a thermoplastic plastic material and having a first surface, a second surface spaced therefrom, and a sidewall connecting the first and second surfaces. The sidewall is formed to flexibly receive and hold an electrically conductive element. An electrically conductive eyelet is affixed to the first surface while the electrically conductive element extends beyond the second surface. The electrically conductive element has a first end formed with a reentrant portion having a terminal end in contact with the sidewall.
REFERENCES:
patent: 2336529 (1943-12-01), Cartun
patent: 2403137 (1946-07-01), Strickland
patent: 4654557 (1987-03-01), Haraden
patent: 4658178 (1987-04-01), Bradley et al.
patent: 5382869 (1995-01-01), Williamson et al.
patent: 6036522 (2000-03-01), Holzer
Day Michael H.
McNeill William H.
Osram Sylvania Inc.
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