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Lamp Bulb
How do automotive lamps work?
FIG. 1 is a vertical sectional view showing a clearance lamp to which a first embodiment of the present invention is applied;
FIG. 2 is a partly cut away perspective view of a lamp body of the clearance lamp shown in FIG. 1;
FIGS. 3A, 3B, 3C and 3D are views for explaining steps of unitarily attaching a gasket to a seal leg;
FIG. 4 is a vertical sectional view showing a clearance lamp to which a second embodiment of the present invention is applied;
FIG. 5 is a sectional view showing a conventional automotive leds ; and
FIG. 6 is a sectional view of an essential part of another conventional automotive lamp.
FIG. 5 is a vertical sectional view showing a conventional automotive lamp of the type as disclosed, for example, in Unexamined Japanese Patent Publication No. Hei. 3-15748. The conventional automotive lamp shown in FIG. 5 includes a lamp body 1 which is formed on a back wall thereof with a seal leg 2 projecting therefrom for surrounding a bulb insertion hole 2 and a gasket 8 disposed between the seal leg 2 and an automobile body panel 6. Both a front and a rear side of the gasket 8 have a respective high adhesive surface so that the gasket 8 sticks both to the seal leg 2 and the automobile body panel 6. In the figure, reference numeral 3 designates a front lens and a reference numeral 4 designates lamp bulb.
FIG. 6 is a sectional view of an essential part of another conventional automotive lamps . As shown in FIG. 6, a gasket 8A is formed like an endless web a cross section of which is U-shaped. An adhesive agent is applied, if desirable, to a tip end of the seal leg 2 so that the gasket 8A sticks to the seal leg 2.
According to the conventional gasket 8 as described above and shown in FIG. 5, however, since the gasket 8 is formed by cutting out a seat-like material to have a frame-shape to fit to the configuration of the tip end of the seal leg 2, the yield rate of the material is very unsatisfactory which raises manufacturing cost.
Further, the high adhesive surfaces of the gasket 8 shown in FIG. 5 are actually made from a double-sided adhesive tape. More specifically, the double-sided adhesive tape with a peel-off sheet on each side is attached to each the front and rear surfaces of the gasket 8. Accordingly, during assembly of the conventional automotive lamp, when the lamp is coupled to the automobile body, the gasket 8 is disposed between the seal leg 2 and the automobile body panel 6, the peel-off sheet on one side of the gasket 8 is peeled off to expose the adhesive surface, and then the adhesive surface is pressed against the seal leg 2 so that the gasket 8 sticks integrally to the seal leg 2. Next, the peel-off sheet of the other side of the gasket 8 is peeled off, and then the lamp is coupled to the automobile body, so that the adhesive surface of the gasket 8 sticks to the automobile body panel 6. Thus, the conventional automotive lamps manufacturer requires complicated steps during assembly, which steps take a relatively long time. That is a problem because it raises the manufacturing cost.
On the other hand, according to the secondary conventional gasket 8A shown in FIG. 6, the gasket 8A is formed by the injection molding operation, and the cost for the mold die apparatus or the like is very high. In addition, the gasket 8A must be attached to the seal leg 2 prior to coupling the lamp to the automobile body. This is intricate. Further, in a case where no adhesive agent is applied to the tip end of the seal leg 2, the gasket 8A may sometimes drop off the seal leg 2.
As described above, according to the automotive lamp of the present invention, a gasket can be molded integrally with a seal leg merely by inserting the seal leg into a foamed gasket material injected into a molding groove. Therefore, the present invention greatly improves the yield rate of the gasket material, and reduces the cost for the gasket, which in turn reduces, the cost for the lamp.
Further, because the gasket is securely integrated with the seal leg, and because the gasket automatically becomes press-fitted between the seal leg and the automobile body panel at the same time the lamp is coupled to the automobile body, the workability is much improved.
The gasket tightly contacts to the seal leg and the automobile body panel when the automotive lamp china is coupled to the automobile body. Therefore, the sufficient sealability of the gasket can be maintained compared with the conventional gasket.
Incidentally, when the gasket is molded integrally with the tip end part of the seal leg, some of the molding steps can be readily automated. If some steps are automated, mass-production of the lamps can be achieved while excessively reducing the manual works.
In addition, if the seal leg is subjected to the surface active treatment, the gasket would hardly detach from the seal leg because of the high adhesibility of the foamed gasket to the seal leg. As a result, easy treatment of the lamp with which the gasket is integrated, improved operation for coupling the lamp to the automobile body, and good workability when the gasket is fitted, can be accomplished.
It should be understood that the form of the invention herein shown and described is to be taken as a preferred example of the invention and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.
from:freepatentsonline
About the Author
If you remove a light bulb from a multi-bulb lamp, does it put more strain on the remaining bulbs?
I am wondering if I were to remove all the bulbs except one from my dining table lamp if it would put more wear on the remaining bulb. I am using fluorescent energy saving bulbs and having 5 of them is way too bright, plus I could save some energy with only one bulb being used. Thanks
The are wired in parallel, meaning the bulbs have the same voltage and amperage if you remove some.
Remove as many as you need to get the brightness you want.
Captret Lights a LED bulb for half the needed power