JPH0430770Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-output incandescent light bulb having a cap that is easy to install.

[Prior art and its problems]

Incandescent light bulbs are usually fitted with caps, but
This base is required to be easily and reliably attachable. In response to this, various mounting structures have been proposed and put into practical use. by the way,
For example, with high-output incandescent light bulbs for studio lighting, the bulb becomes hot when lit.
In order to make it difficult for this heat to be conducted to the base, first,
Adhesive was applied to the cap mounting part of the valve, heat-resistant tape for insulation was wrapped and glued on top of this, and then adhesive was spread on top of the heat-resistant tape and the cap was press-fitted and glued. Here, since there is variation in the outer diameter dimension of the valve cap mounting portion, the number of times the heat-resistant tape is wound is varied in accordance with this variation, thereby adjusting the variation. Therefore, the process of attaching the cap is very complicated with many steps, and if the number of wraps of the heat-resistant tape is not appropriate, the cap may spin idle and fall off.
On the other hand, there was a problem in that it was extremely difficult to press-fit the cap.

[Purpose of invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a high-output incandescent light bulb that has a base that is easy to install and can be installed reliably.

[Structure of the idea and its function]

The incandescent light bulb of the present invention is fitted onto a heat-resistant tape wrapped around the base mounting part of the bulb, and has multiple notches from one end and an inner base with multiple protrusions facing outward. The device is characterized by comprising an outer cap that is placed over the outside of the inner cap, the inner surface of which contacts the protrusion, and is fixed to the other end of the inner cap.

That is, since a plurality of notches are provided from one end of the inner cap and a plurality of protrusions are formed toward the outside, when the inner cap is press-fitted into the cap mounting portion of the valve wrapped with heat-resistant tape,
One end of the cap is deformed outward, but since the protrusion is in contact with the inner surface of the outer cap, the protrusion buckles a little and comes into pressure contact with the outer cap. Therefore, this protrusion acts like an elastic body and is firmly press-fitted and fixed by the elastic force, so that no adhesive or the like is required. Since the amount of buckling changes depending on the variation in the outer diameter of the valve fitting, there is no need to change the number of wraps of the heat-resistant tape depending on the variation, making the installation process very simple. .

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows an incandescent light bulb for studio lighting with a rating of 10 KW, in which one end of the quartz glass bulb 10 is reduced in diameter to a slightly smaller diameter via a step 12, and a cap mounting portion 11 is formed. . Inside the valve 10, a filament 13 is connected to a pair of upper and lower bridges 1.
4, 14. One end of the valve 10 has a small diameter, and its opening is sealed with a sealing plug 18 made of molybdenum, and a molybdenum rod 15 for energization that supports the lower bridge 14 extends from the sealing plug 18. ing. A twisted wire 16 made of thin wires is attached to the tip of this molybdenum rod 15.
One end of the stranded wire 16 is brazed, and a copper rod 17 is brazed to the other end of the stranded wire 16.

The inner cap 20 is made of a stainless steel tube with a plate thickness of 0.3 to 0.4 mm, and its inner diameter is almost the same as the outer diameter of the cap mounting part 11. However, as shown in Fig. 2, a number of notches 21 are provided from one end side 20a to a predetermined length, and a number of hemispherical projections 22 are formed between the notches 21 toward the outside. The other end side 20b has rivet holes 23.
, and a plurality of heat radiation windows 24 are formed on the peripheral surface.

The outer cap 30 is also made of a stainless steel tube with a plate thickness of 0.5 mm, and its inner diameter is approximately the same as the circle connecting the apexes of the protrusion 22, but as shown in FIG. A terminal 31 protrudes from there through an insulator (not shown). Rivet holes 33 are drilled on the circumferential surface, and a large number of heat dissipation windows 32 are formed.
is drilled.

Next, the installation operation will be described. First, as shown in FIG. 4, a Teflon heat-resistant tape 41 having an adhesive surface formed on one side is wrapped around the cap attachment part 11. There is no need to consider variations in the outer diameter of the cap mounting portion 11 when determining the number of times of winding. Then, the inner cap 20 is inserted from the one end side 20a, and the end edge is brought into contact with the stepped portion 12, but since the heat-resistant tape 41 is wrapped around it, its outer diameter is larger than the inner diameter of the inner cap 20. Due to the action of the notch 21, one end side 20a of the inner base 20 is deformed outward. Note that, at this time, no adhesive was applied onto the heat-resistant tape 41.

Next, the outer cap 30 is press-fitted so as to cover the inner cap 20, its edge is brought into contact with the stepped portion 12, and the copper rod 17 is inserted into the terminal 31, but one end side 20a of the inner cap 20 is Because it is deformed outward,
In the process of press-fitting the outer cap 30, the protrusion 22 is slightly buckled by the inner surface of the outer cap 30, and is pressed into contact with the protrusion 22 in an elastically deformed state. The amount of buckling of the protrusion 22 changes depending on the variation in the outer diameter of the base mounting portion 11. Then, insert the rivet 42 into both rivet holes 23 and 33, caulk it, and attach the inner cap 2.
0 and the outer base 30 are fixed, and the copper rod 17 inserted into the terminal 31 is further brazed to the terminal 31 to complete the assembly. In addition, the inner cap 20 and the outer cap 3
0 fixing means is not limited to rivets.

In this way, the projections 22 are pressed against the inner surface of the outer base 30 in an elastically deformed state, so that they are fixed very firmly. Even though no adhesive is used, these bases do not spin freely during use.
In addition, since the amount of buckling of the projections 22 varies according to the variation in the outer diameter of the base mounting portion 11, there is no need to adjust the variation in the outer diameter of the base mounting portion 11 by changing the number of times the heat-resistant tape 41 is wrapped around it, and therefore the mounting operation is extremely simplified.

[Effect of idea]

As explained above, in the incandescent light bulb of the present invention, a plurality of notches are provided from one end side of the inner cap, and a plurality of protrusions are formed outward, and the outer cap is press-fitted to cover the inner cap. The protrusion acts like an elastic body that adjusts variations in the valve, and its elastic force allows it to be firmly fixed. Therefore, it is possible to obtain a high-output incandescent light bulb that is easy to install and has a cap that can be installed reliably.

[Brief explanation of the drawing]

FIG. 1 is a side view of the incandescent light bulb, FIG. 2 is a front view of the inner cap, FIG. 3 is a side view of the outer cap, and FIG. 4 is a cross-sectional explanatory view of the assembled state. 10... Valve, 11... Base mounting part, 12...
...Stepped portion, 20...Inner cap, 21...Notch,
22...Protrusion, 30...Outer cap, 31...Terminal, 23, 33...Rivet hole, 41...Heat-resistant tape, 42...Rivet.

Claims (1)

[Scope of utility model registration request] It is fitted onto the heat-resistant tape wrapped around the valve's base mounting part, and has an inner base with multiple notches from one end and a plurality of protrusions facing outward. An incandescent light bulb comprising: an outer cap whose inner surface is in contact with the protrusion and which is fixed to the other end side of the inner cap.