Double filament incandescent lamp

(19)

(11)

EP 0 500 340 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.12.1992 Bulletin 1992/53

(43)	Date of publication A2:
	26.08.1992 Bulletin 1992/35

(21)	Application number: 92301359.3

(22)	Date of filing: 19.02.1992

(51)	International Patent Classification (IPC)⁵: H01K 9/08, H01K 1/18

(84)	Designated Contracting States:
	DE FR GB IT

(30)

Priority:

21.02.1991 US 659204

(71)	Applicant: GENERAL ELECTRIC COMPANY
	Schenectady, NY 12345 (US)

(72)	Inventors:
	Rachel, Bernard White Highland Heights, Ohio 44143 (US) LeCrone, Richard Clair Chesterland, Ohio 44026 (US) Bowen, Michael Wayne Memphis, Tennessee 38115 (US)

(74)	Representative: Pratt, Richard Wilson
	London Patent Operation G.E. Technical Services Co. Inc. Essex House 12/13 Essex Street London WC2R 3AA London WC2R 3AA (GB)

(56)

References cited: :

(54)	Double filament incandescent lamp

(57) This incandescent lamp comprises a glass bulb having a longitudinal axis and two filaments of coil form within the bulb supported with their longitudinal axes oriented parallel to the bulb longitudinal axis. For supporting the filaments, three support wires are provided, each with an outer portion fixed to the bulb and extending parallel to said bulb longitudinal axis and an inner portion extending substantially perpendicular to the outer portion. The inner and outer portions of all three support wires are located in a single reference plane extending parallel to the bulb longitudinal axis. The filaments are joined to the support wires by four welded joints, one between one filament and the inner portion of a first one of the support wires, a second between said one filament and the inner portion of a second one of the support wires, a third between the other filament and the inner portion of said first support wire, and the fourth between the other filament and the inner portion of a third one of the support wires. The inner portions of said second and third support wires extend toward each other and are substantially aligned.
For fixing the outer portions of the support wires to the glass bulb, the bulb has a glass seal portion through which said outer portions extend in sealed laterally-spaced relationship; and through this seal portion also extends an exhaust tube for the bulb which is located between said outer portions of said second and third support wires.

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