JPH0422537Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a base for a double filament light bulb from which two lead wires are taken out in the lateral direction.

As this type of light bulb cap, the structure shown in FIGS. 4 and 5 is well known as a conventional example. In this conventional example, 1 is a valve, and two filaments 2 and 3 are disposed within the valve, and one lead wire 4 and 5 is taken out from each filament in the lateral direction, It has a structure in which the cap 6 is folded back to the outside at a notch 7 provided on the upper edge thereof, and the two lead wires 4 and 5 are brought together and fixed to the body of the cap 6 with solder 8.

[Problems to be solved by the invention] In the conventional example, the two lead wires 4 and 5 are bundled together and soldered in a substantially contacting state, resulting in a narrow gap between the two lead wires 4 and 5. The molten solder flows through the narrow gap, wraps around the inside of the cap due to so-called capillary action, and comes into contact with the bulb of the glass bulb. This contact of molten solder with the bulb results in a thermal shock that can crack or break the glass bulb.

[Means for Solving the Problems] As a specific means for solving the above-mentioned problems, the present invention provides a base for a double filament light bulb from which two lead wires are taken out in the horizontal direction. The present invention provides a light bulb base, characterized in that a guide groove is provided on the edge of the bulb, in which the two lead wires are guided separately, the guide groove being provided with a guide groove in which the two lead wires are guided separately in a separated state. In order to
Even if both lead wires are soldered together during the soldering process, molten solder will not flow along the lead wires and get inside the cap.

[Examples] Next, the present invention will be explained in more detail with reference to illustrated examples. In order to facilitate understanding, the same parts as in the conventional example will be described with the same reference numerals.

In the first embodiment shown in FIGS. 1 and 2, 1 is a valve, and two filaments 2 and 3 are disposed inside the valve, and one lead wire 4 is connected from each filament. , 5 are taken out laterally, folded back outward at the notch 7 provided on the upper edge of the cap 6, and the two lead wires 4, 5 are brought together and soldered 8.
It is fixed to the body of the cap 6 with. In this case, guide grooves 9 and 10 for guiding the two lead wires 4 and 5 separately are formed at appropriate intervals in the notch, and two guide grooves are formed along the guide grooves. The lead wires 4 and 5 are folded back to the outside and soldered.

In the second embodiment shown in FIG. 3, the guide groove 9 is
a, 10a, and as in the previous embodiment, take out the two lead wires 4, 5 along these guide grooves, respectively, fold them back, and then solder them together at the body of the cap. . In either embodiment, the two lead wires taken out in the lateral direction are guided separately by the respective guide grooves, and a contact state is established where capillary phenomenon occurs between the two lead wires. Therefore, even if both lead wires are soldered together, molten solder will not run between the lead wires and enter the inside of the cap 6.

[Effect of the invention] As explained above, the light bulb base according to the present invention is a double filament light bulb base from which two lead wires are taken out in the horizontal direction, and the two lead wires are attached to the upper edge of the base. By adopting a configuration in which guide grooves are provided in which the lead wires are guided separately, even if the two lead wires are soldered together, there is still a gap between the two lead wires that would cause capillary action. Therefore, during the soldering process, the molten solder will not travel between the two lead wires and wrap around the inside of the cap, and the glass bulb will not crack or break due to the thermal shock of the molten solder, which previously occurred. This has the excellent effect of eliminating the inconvenience caused by

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of a light bulb cap according to the present invention, FIG. 2 is a perspective view of a light bulb with the same cap attached, and FIG. 3 is a side view showing the cap of the second embodiment. FIG. 4 is a perspective view of a conventional light bulb, and FIG. 5 is an explanatory diagram showing only the main parts of the conventional light bulb in an enlarged manner. 1... Valve, 2, 3... Filament, 4,
5... Lead wire, 6... Base, 7... Notch, 8
... Solder, 9, 10, 9a, 10a... Guide groove.

Claims (1)

[Claims for Utility Model Registration] (1) A base for a double filament light bulb from which two lead wires are taken out in the horizontal direction, and a guide for guiding the two lead wires separately on the upper edge of the base. A light bulb base characterized by having a groove. (2) The light bulb cap according to item (1) above, wherein the ends of the two lead wires are soldered together.