JPS6035949Y2 - Tube cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube cap, and more particularly to an improvement in the structure of a cap used in a straight tube fluorescent lamp.

Tube caps, such as those used in straight tube fluorescent lamps, are made by pressing a plate material such as aluminum into a metal shell with terminal pins installed through an insulating material. The part is caulked to an insulating member.

Conventionally, the above-mentioned insulating member has generally been a phenolic resin laminate or a cloth-filled phenolic resin laminate.

The insulating material of such a phenolic resin laminated board can be removed by applying strong pressure when bonding the insulating member to a metal shell or caulking the end of a terminal pin to the insulating material. Cracks and cuts are likely to occur in the
If the crimping force is adjusted to prevent this, the tightening force between the metal shell, the phenolic resin laminate that is the insulating member, and the terminal pin becomes weaker, resulting in insufficient adhesion between the insulating member and the terminal pin, which may result in rocking. The disadvantage was that defects were likely to occur.

In addition, phenolic resin laminates are hot-processed to prevent cracks from forming insulating members and when drilling holes in them, but if the heating temperature is not appropriate, defects such as cracks may occur. It had the disadvantage of requiring additional equipment.

This invention was made to prevent the above-mentioned drawbacks.
It is an object of the present invention to provide an improved tube cap that does not cause cracks or breakage of an insulating member and is therefore less likely to cause defects.

The details of the invention will be explained below with reference to an illustrated embodiment.

The figure is a partially cutaway front view of a fluorescent lamp cap according to an embodiment of the present invention, in which a terminal pin 4 is embedded in a metal shell 1 through insulating members 2 and 3 made of vulcanized fibers treated as described below. The ends are caulked and fixed.

Insert the external lead-in wire of the fluorescent lamp (not shown) into the through hole 5 drilled in the terminal pin 4, and attach the end of the metal shell opposite to the side on which the terminal pin 4 is mounted using base cement to the glass of the fluorescent lamp. The terminal pin 4 is fixed to the end of the bulb, and the tip of the terminal pin 4 is electrically conductively fixed to the external lead-in wire by soldering or the like to complete the fluorescent lamp.

The above-mentioned insulating members 2 and 3 are made of vulcanized fibers made by soaking paper in a concentrated solution of zinc chloride to solidify it, polymerizing it, washing it with water, and pressing it together.The insulating members 2 and 3 are impregnated with (contains) a synthetic resin such as methylated methylolmelamine. It is composed of a plate material whose waist and surface are covered with a coating of synthetic resin such as urethane.

Here, the synthetic resin coating may be formed by exudation of a synthetic resin impregnated (contained) in the vulcanized fiber.

The material of the insulating member used in this invention is that the vulcanized fiber itself has excellent heat resistance and
In addition to being water resistant, it has a resin layer on the surface, and this resin layer functions as a so-called surface protective layer, so it has good water and moisture resistance, and can be made into a long length (because it is not brittle), so it is insulated. The processing efficiency and material yield when processing into parts are also good.

Furthermore, unlike conventional phenolic resin-based laminate materials, it is not brittle, so it not only does not crack or break.
There is no need for hot processing during processing, and processing can be performed at room temperature without producing any defective products, so processing is easy, reducing the number of man-hours and reducing the number of defective products. .

Moreover, when manufacturing the cap of the present invention, there is no need to adjust the crimp force when caulking the end of the terminal pin to the insulating member, and cracks do not occur. It can be crimped and fixed to the metal shell.

As described in detail above, the present invention has terminal pins embedded in a metal shell through an insulating member, in which the insulating member is a vulcanized fiber impregnated with a synthetic resin.
This tube cap is characterized in that it is constructed from a plate material containing a synthetic resin film on its surface.

However, unlike the conventional phenolic resin laminated board, the insulating member according to the present invention does not require hot processing, does not cause cracks or breakage, and therefore allows the terminal pin to be connected to the metal via the insulating member. An improved bulb that can be fixed to the shell with sufficient crimp force, eliminating any occurrence of swinging of the terminal pin, reducing man-hours in the manufacturing process of bulb caps, and improving yield. It has the excellent effect of providing a cap for use.

Note that the present invention is not limited to the caps for fluorescent lamps explained in the embodiments, but can also be applied to caps for light bulbs, electron tubes, etc., in which terminal pins are embedded in a metal shell through an insulating member. Also, the number of insulating members is not two as in the embodiment (it goes without saying that it may be one).

[Brief explanation of the drawing]

The figure is a partially cutaway front view of a fluorescent lamp base according to an embodiment of the present invention. 1... Metal shell, 2, 3... Insulating member, 4... Terminal pin.

Claims (1)

[Scope of utility model registration request] In a device in which a terminal pin is embedded in a metal shell through an insulating member, the insulating member is a plate material made of vulcanized fibers impregnated with (containing) a synthetic resin, and a synthetic resin coating is applied to the surface of the vulcanized fiber. A tube cap characterized by comprising: