JPS6233242Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a lamp cap for a tube, especially a cap for an annular fluorescent lamp.
This invention relates to a cap for a U-shaped fluorescent lamp.

For example, a cap for an annular fluorescent lamp is generally formed by providing a cap pin insertion hole in one of the cap main bodies that can be separated into two parts, and inserting the cap pin into the cap pin insertion hole. However, in most of the various conventional structures, the cap pin inserted into the cap pin insertion hole protrudes inward from the surface of the cap pin insertion hole by the thickness of the cap pin. Therefore, when the lead-in wire is inserted into the cap pin, the lead-in wire gets caught on the protruding portion of the cap pin, making it impossible to insert the lead-in wire into the cap pin. For this reason, the work of inserting the lead-in wire into the cap pin has been done manually because it is extremely difficult to automate the process. The disadvantage was that the work was extremely difficult because it got stuck.

Therefore, the object of the present invention is to provide a tube cap having a structure that allows the lead-in wire to be inserted into the cap pin extremely smoothly, and also allows automation of the insertion work. be.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a cross-sectional view of an annular fluorescent lamp cap which is an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the same main part, and Fig. 3
The figure is an enlarged sectional view of the base body. As shown in FIG. 1, the main components of this annular fluorescent lamp cap include a plastic cap body 1, 2 that can be separated into two parts, and a cap pin 3. The cap body 2 includes a tapered guide hole 4 that guides a lead-in wire (not shown) connected to a filament coil (not shown) into the cap pin 3, and a tapered guide hole 4 that is connected to the small diameter part of the guide hole 4 to form a cap. A cap pin insertion hole 5 is provided, through which one end of the pin 3 is inserted, and which has a diameter large enough to create a gap between it and the outer peripheral surface of the cap pin 3. The small diameter portion is smaller in diameter than the cap pin insertion hole 5, and forms a protrusion 8 near the entrance of the cap pin insertion hole 5 so as to partially block this entrance. An annular protrusion 6 having a height that contacts the outer peripheral surface of the cap pin 3 in the circumferential direction is formed on the circumferential surface of the cap pin insertion hole 5 (see FIGS. 2 and 3). As shown in FIG. 2, the tip region of one end of the base pin 3 is located between the protrusion and the protrusion 6, and is expanded in a tapered shape. The tapered inner surface 3a of the tip region of the cap pin 3 and the tapered surface 4a of the guide hole 4 are smoothly connected.

To manufacture a cap for an annular fluorescent lamp having such a structure, first, one end of the cap pin 3 is inserted into the cap pin insertion hole 5 of the cap body 2 . At this time, the inner peripheral edge of one end of the base pin 3 is in a state of slightly projecting inward of the hole on the small diameter side of the tapered portion of the guide hole 4. Next, after supporting the other end of the cap pin 3 with a jig (not shown), using a punch 7 whose tip end is formed in the same shape as the tapered shape of the guide hole 4,
When this tip is inserted into the guide hole 4 and pressurized, the tip region of one end of the cap pin 3 is pushed out into a tapered shape using the protrusion 6 as a fulcrum, so that the tapered inner surface 3a of the tip region of the cap pin 3 is expanded. and the tapered surface 4a of the guide hole 4 are smoothly connected.

FIG. 4 shows another embodiment of the present invention, and FIG.
The figure shows the base body, in which the protrusions are provided discontinuously on the circumferential surface of the base pin insertion hole, rather than continuously as in the above embodiment. This protrusion 6
3 to 3 in the circumferential direction on the circumferential surface of the cap pin insertion hole 5
Five pieces are formed.

In the annular fluorescent lamp cap configured as described above, the tip region of one end of the cap pin 3 is located between the protrusion and the protrusion 6, and the tip region is expanded in a tapered shape. Since the tapered inner surface 3a is smoothly connected to the tapered surface 4a of the guide hole, the lead-in wire can be smoothly inserted into the cap pin 3, and even if a large tensile force is applied to the cap pin 3, The cap pin 3 can be prevented from slipping out from the cap pin insertion hole 5. Moreover, since the shape of the cap pin insertion hole 5 is simple, it can be formed very easily.

Next, specific embodiments of the present invention will be described.

Example 1 In an annular fluorescent lamp cap having the structure shown in FIGS. 1 and 2, the plastic cap body has a cap pin insertion hole with a diameter of 2.38 mm and a length of 3.5 mm.
The tapered part has a guide hole with a diameter of 2.4 mm in the small diameter part, a diameter of 4.0 mm in the large diameter part, and a length of 3.5 mm. Protrusions with a height of 0.1 mm are formed at locations 1.0 mm apart. Then, each of the four cap pin insertion holes has a diameter of 2.35 mm and a length that conforms to the pin dimensions of the G10Q cap stipulated in JIS C7709 "Types and dimensions of caps and holders for light bulbs". Insert one end of four brass cap pins with a protruding length of 7.1 mm from the bottom of the cap body, and use a punch to push the tip area of one end of the cap pins into a tapered shape.
The tapered inner surface of the tip region of the base pin smoothly connects with the tapered surface of the guide hole.

Note that the outer diameter of the cap pin is slightly larger than the diameter obtained by adding the height of the protrusion to the diameter of the cap pin insertion hole, but when inserting the cap pin into the cap pin insertion hole, the cap pin does not touch the protrusion. There is no problem because it is inserted deep into the cap pin insertion hole by climbing over the cap.

In the work of inserting the lead-in wire into the cap pin of the annular fluorescent lamp cap obtained in this way, we investigated the insertion property and found that the tip of the lead-in wire was in contact with the guide hole while the lead-in wire was inserted into the cap pin insertion hole. It entered near the entrance of the guide hole and passed through the joint between the guide hole and the cap pin very smoothly, and was inserted all the way to the tip of the cap pin. In other words, it was confirmed that the insertion property was extremely good. In addition, when the tensile strength of the cap pin was examined, it was confirmed that it could withstand a tensile force of approximately 12 kg, and was found to pose no practical problems.

Example 2 In the structure shown in the fourth figure, a height of 0.1 mm and a width of 0.2 mm are placed along the circumferential direction of the base pin insertion hole.
Five protrusions with a length of 2.0 mm and a length of 2.0 mm were provided at equal intervals, and the dimensions of the guide hole and the diameter and length of the base pin insertion hole were the same as in Example 1, making it easy to insert the lead-in wire. When the tensile strength of the cap pin was examined, the same effects as in Example 1 were obtained.

Furthermore, this invention is applicable not only to caps for annular fluorescent lamps, but also to
Of course, the present invention can also be applied to a U-shaped fluorescent lamp cap having a single-cap structure.

As explained above, according to the present invention, the lead-in wire can be inserted into the base pin extremely smoothly without any problems, so work efficiency is greatly improved.
In addition, the insertion work can be automated, and there is no problem in actual use with respect to the tensile strength of the cap pin, and the guide hole and cap pin insertion hole have a simple shape. , these can be formed very easily on the base body.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a tube cap, which is an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the same main part, Fig. 3 is an enlarged sectional view of the main body of the cap, and Fig. 4 is an enlarged sectional view of the main part of the same. A sectional view of a tube cap according to another embodiment, and FIG. 5 is an enlarged sectional view of the main body of the cap. 1, 2...Base body, 3...Base pin, 4...
Guide hole, 5...Base pin insertion hole, 6...Protrusion, 8
...protrusion.

Claims (1)

[Scope of utility model registration request] This tube cap has a cap pin through which a lead-in wire is inserted into a plastic cap body, and a tapered guide hole for guiding the lead-in wire into the cap pin, and a small diameter portion of the guide hole. The cap body is provided with a cap pin insertion hole having a diameter large enough to allow one end of the cap pin to be inserted therethrough and to create a gap between the cap pin and the outer circumferential surface of the cap pin, and the small diameter portion is inserted through the cap pin insertion hole. forming a protruding portion having a smaller diameter than the hole and protruding the small diameter portion near the entrance of the base pin insertion hole so as to partially block the entrance;
A protrusion having a height that contacts the outer peripheral surface of the cap pin is formed continuously or discontinuously in the circumferential direction on the circumferential surface of the cap pin insertion hole, and a tip region of one end of the cap pin is connected to the protrusion and the protrusion. The tube cap is located between the protrusion and the tip region is pushed out in a tapered shape so that the tapered inner surface of the tip region of the cap pin is smoothly connected to the tapered surface of the guide hole.