FR2754936A1 - Dual filament incandescent lamp allowing use after first filament has failed - Google Patents

Abstract

The incandescent lamp bulb is fitted with two filaments which operate one at a time. The filaments may be geometrically in parallel or perpendicular. The lamp bulb (1) has the two filaments (2, 3) connected at one end to a common current connector (4) but has the other end (5, 6) of each of the filaments going to separate current connections. One of the connections is covered by a cap (7) made of an insulating material. The cap is coated with a conducting layer so the power connection make contact with the other filament termination. When the first filaments fails the cap is removed to allow connection direct to the other filament.

Description

 The present invention relates to the reuse of incandescent lamps once burnt out (out of order) .when an incandescent lamp is burnt out, phenomenon caused in most cases by the rupture of the filament internal to the bulb, this- it no longer works is to be thrown away.

 The device according to the invention overcomes this drawback and allows the bulb to be able to be reused, by multiplying the number of filaments. In fact, according to a first characteristic, a bulb having two filaments in parallel or perpendicular does not These filaments have the same current input but different outputs. In the case of baffle bulbs, the base is equipped with two contact points, to circulate the electric current, we add a third. We keep a old contact point as common current input, the two other contact points will serve as current output for each filament. We cover an old contact point used as current output with a cap made of insulating material, we stick on it a conductive material connected to the third contact point (this point is the second current output) so the device works co even a bulb having a filament through which the electric current passes and a base with its two conventional contact points.

Once the filament is burnt out (broken), it is enough to remove the cap to be able to use the contact point current output which feeds the second filament; by doing so we have just reused the bulb.

The accompanying drawings illustrate the invention:
Figure 1 shows a top view of the bulb.

Figure 2 shows a cross-sectional view of the bulb.

FIG. 3 represents a detailed view of the cap which covers the contact point.

 With reference to these drawings, the device comprises a bulb (1) equipped with two filaments (2) and (3) connected to a current input by the contact (4) and two current outputs (5) and (6) with a cap (7) covering the contact (5). This cap is composed of an insulating material (8) and a conductor (9).

 Of course, the invention is not limited to the embodiments described and shown for which it is possible to provide variants in particular in - the materials making up the device.

- the shape of the bulbs.

- the method of fixing the bulbs to the sockets (clean balloon, screwing or other).

- the number of filaments.

without departing from the scope of the invention.

Claims (2)

 CLAIM  I) Incandescent bulb (1) characterized in that it has two independent filaments (2) and (3), in parallel or perpendicular, connected to a common current input (4) and to two outputs (5) and (6) located on the base of the bulb, one of the outlets (5) being covered with a cap (7), said cap (7) consisting of an insulating material (8) covered with a conductive material ( 9) which is connected to the other outlet (6) of the other filament (2). 2) A method of reusing an incandescent bulb according to claim 1 in the case where the filament (2) is broken characterized in that the cap (7) is removed in order to be able to use the contact point of sortlzS) which feeds the second intact filament (3) to be used.