JPH0345431Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a light bulb adapter used when attaching a halogen light bulb with a small diameter base to a socket for a beam light bulb with a large diameter.

[Background technology]

Conventionally, beam light bulbs have been used as floodlight bulbs. However, recently, the use of halogen light bulbs has been increasing as they are small, inexpensive, have a clear light distribution pattern, and can be easily designed for light distribution. in this way,
When replacing a beam light bulb with a small halogen light bulb, it would be expensive to replace the entire lighting fixture, so an adapter was devised that allows you to attach a small halogen light bulb to a beam light bulb lighting fixture. There is. For example, Utsukai Showa 62-
There is an adapter as shown in FIGS. 5 to 7 disclosed in Japanese Patent No. 5579. Note that this adapter is used when attaching a halogen light bulb to an incandescent light bulb socket.

In FIG. 5, the adapter has a reflective cap 7 at the tip.
0, a middle body 71, and an incandescent lamp cap 72 at the rear end. The reflective shade 70 is formed of a dichroic mirror with an optical multilayer reflective coating applied to the inner surface of a glass material. Further, as shown in FIG. 6, the middle body 71 is formed by molding ceramics into two halves, and an inner cylinder body 75 has a small-diameter socket 74 in the center of which a halogen light bulb 73 is attached.
and an outer cylindrical body 76 extending toward the tip so as to surround the inner cylindrical body 75. The tip of 76 serves as a mounting portion 78 for the reflective shade 70.

Further, two jetties 83 and 84 are provided on the outer wall of the upper end of the outer cylinder 76, and the inner cylinder 75
includes an electrode fitting 79 disposed in the socket 74,
Pinch grooves 81 and 82 are formed to sandwich and hold the tongue portions 80 (see FIG. 7).

In the adapter having such a configuration, the tongue portion of the electrode fitting 79 is inserted into the groove 81, and the electrode fitting 8 is inserted into the groove 81.
The tongue part of the ring 85 is placed between the pair of protrusions 83 and 84, and the middle body 71 is integrated in a temporarily fixed state.

Next, the incandescent light bulb cap 72 is placed on the attachment part 77 at the rear end of the middle body 71 and cemented, and the neck of the reflector 70 is inserted into the attachment part 78 at the tip and cemented.

With the halogen bulb 73 screwed and attached to the socket 74, the incandescent bulb cap 72 can be attached to an existing incandescent bulb lighting fixture for use.

However, according to the adapter configured in this way, the outer cylindrical body 76 of the middle body 71 and the reflective shade 70 are directly bonded with cement. Moreover, the middle body 71 is made of ceramic, and the reflective shade 70 is made of glass.
The thermal expansion coefficients of the middle body 71 and the reflective shade 70 are different from each other. For this reason, the degree of expansion of the middle body 71 and the reflective shade 70 due to the radiant heat of the halogen light bulb 73 is different, resulting in a problem that damage such as cracking occurs to the middle body 71 or the reflective shade 70.

Furthermore, since the halogen light bulb 73 is covered by the middle body 71, there is a problem in that the life of the light bulb is shortened due to the heat generated by the light bulb at high temperatures.

[Purpose of invention]

The purpose of this invention is to provide a light bulb adapter that can prevent damage to the adapter body or reflective shade or shorten the life of the light bulb due to expansion due to radiant heat of the light bulb.

[Disclosure of invention]

The light bulb adapter of this invention includes an adapter body having a holder at the tip and a base mounting part formed at the base, and a light bulb insertion hole located at the tip of the adapter body at a position facing the holder. With a reflective hat,
The device includes a metal connecting ring that is fitted over the reflective shade and the adapter body to connect the adapter body and the reflective shade, and a cap attached to the cap attachment portion.

According to the configuration of this invention, the adapter main body and the reflective shade are connected by a connecting ring, and the cap is attached to the cap mounting portion at the base of the adapter main body. Then, the light bulb is inserted into the receiver of the adapter body through the light bulb insertion hole of the reflective shade, and the base is attached to an existing lighting fixture for use.

Since the metal connecting ring is fitted over the adapter body and the reflective shade, it can absorb the difference in expansion between the adapter body and the reflective shade caused by the radiant heat of the light bulb.
Therefore, even if the adapter body and the reflective shade have different coefficients of thermal expansion, damage to the adapter body or the reflective shade can be prevented. Moreover, since the connecting ring is made of metal, the radiant heat of the bulb is radiated through the connecting ring, lowering the temperature of the bulb sealing part and extending the life of the bulb.

Embodiment An embodiment of this invention will be explained based on FIGS. 1 to 4. That is, as shown in FIG. 1, the light bulb adapter of this embodiment has a receiver 1 at the tip.
1 and a base mounting portion 12 formed at the base; a reflective shade 14 disposed at the tip of the adapter body 10 and provided with a light bulb insertion hole 13 at a position facing the receiver 11; Reflective shade 14
a metal connecting ring 15 that is fitted over the adapter body 10 and connects the adapter body 10 and the reflective shade 14; and the base mounting portion 12.
It is equipped with a base 16 attached to the base.

The reflective shade 14 is composed of a dichroic mirror with a multilayer optically functional reflective surface 18 on the inner surface of a glass material 7, and it blocks unnecessary heat rays (infrared rays) from light bulbs.
Transmits 80% backwards. Further, a light bulb insertion hole 13 is provided in the neck portion 14' of the reflective shade 14, and a recess 19 is formed in the outer periphery of the neck portion 14'.

The adapter body 10 is formed by molding and sintering a ceramic material into a pair of adapter body constituent members 10a and 10b which are vertically divided into two and have the same shape, as shown in FIG. The adapter main body components 10a and 10b have a concave portion 28 formed on the outer periphery of the tip, and a small-diameter cap attachment portion 12 at the base. Further, a light bulb insertion hole 20 is open on the tip side, and a receiver mounting groove 21 is formed on the inner peripheral surface of this light bulb insertion hole 20. Further, a pair of conductive metal fitting grooves 22 and 23 are arranged in parallel extending from the light bulb insertion hole 20 to the base ends of the adapter body components 10a and 10b, and the same conductive metal fitting grooves 22 and 23 are arranged in parallel. A conductive fitting fitting groove 24 is formed. Further, a screw insertion hole 25 is formed to open into the conductive metal fitting groove 24 from the base end of the adapter body constituent members 10a, 10b.

Further, the connecting ring 15 is made of stainless steel and has a cylindrical shape, and has a flange 26 protruding from the inner peripheral surface of one open end. And Tsuba 26
A plurality of locking claws 27 are provided to protrude inward.

Next, the assembly of the light bulb adapter will be explained. First, both adapter main body constituent members 10a, 10
When aligning b, the adapter body component 10
The receiver 11 and conductive fittings 29, 30 shown in FIG. 3 are fitted into the receiving fitting grooves 21 and the conducting fitting fitting grooves 22, 23, 24 of a and 10b. The receiver 11 and the conductive metal fittings 29 and 30 are both made of brass. The receiver 11 is provided with a protruding collar 31 having a protruding piece 32 on the outer periphery, and the collar 31 is inserted into the receiver mounting groove 2.
1. Further, the conductive metal fitting 29 includes an L-shaped piece 35 having a screw hole 34 and an elastic contact piece 3.
32 are riveted, and the piece 33 is placed in the light bulb insertion hole 20 of the adapter body constituent members 10a, 10b, and the L-shaped piece 35 is fitted into the electrode fitting fitting grooves 22, 24. Furthermore, conductive metal fittings 3
0 is provided with a pair of guide pieces 36 at one end, which fit into the conductive fitting fitting grooves 23 of the adapter main body constituent members 10a and 10b, and between the guide pieces 36, the projecting piece 32 of the receiver 11 is inserted. Insert it and connect it to the money receiver 11.

And adapter main body constituent members 10a, 10b
are fitted together, the connecting ring 15 is fitted onto the tip of the connecting ring 15, and the locking claw 27 is inserted into the concave portion 2 of the adapter body 10.
Lock at 8. Furthermore, a brass cap 16 is fitted onto the cap mounting portion 12 at the base end of the adapter body 10 . Note that, as shown in FIG.
Fix it with. Furthermore, as shown in FIG. 1, an insulating cap 40 is placed on the bottom surface of the base 16,
Insert the fixing screw 41 of the conductor into the screw insertion hole 25 of the adapter body 10, and insert the screw hole 34 of the conductive metal fitting 29.
and fix the cap 16. The neck portion 14' of the reflective shade 14 is inserted into the connecting ring 15, and the connecting ring 15 is caulked to engage the recess 10 of the reflective shade 14, thereby fixing the reflective shade 14.

Insert the halogen light bulb 39 from the light bulb insertion hole 13 of the reflective shade 14 into the light bulb insertion hole 20 of the adapter body 10, screw the base of the halogen light bulb 39 into the receiver 11, and electrically connect the shell to the receiver 11. , the eyelet of the base of the halogen light bulb 39 is electrically connected to the contact piece 33 of the conductive metal fitting 29. That is, the shell of the base of the halogen light bulb 30 is
1 and the base 16 through the conductive metal fitting 30, and the eyelet is connected to the fixing screw 41 through the conductive metal fitting 29. Then, the base 16 of the adapter body 10 is used by being attached to an existing beam light bulb lighting fixture.

According to the light bulb adapter configured in this way, the metal connecting ring 15 is attached to the adapter body 10.
and the reflective shade 14, and the adapter body 1
Since 0 and reflective shade 14 are connected, halogen bulb 3
Adapter body 10 and reflective shade 14 by radiant heat of 9
can absorb the difference in expansion. Therefore, even if the adapter body 10 is made of ceramics and the reflective shade 14 is made of glass and have different coefficients of thermal expansion, damage to the adapter body 10 or the reflective shade 14 can be prevented.

Further, since the connecting ring 15 is made of metal, the radiant heat of the halogen bulb 39 is radiated through the connecting ring 15, reducing the temperature of the bulb sealing part and extending the life of the halogen bulb 39.

In addition, the adapter main body component 10 split into two
A and 10b are fitted with a connecting ring 15 externally. The connecting ring 15 is stronger than the conventional linear ring 85 shown in FIG. 6 because it is strip-shaped. Therefore, even if an external force is applied to the adapter body 10, the stress is alleviated by the connecting ring 15, and the adapter body constituent members 10a, 10b do not shift or come off from each other, and can be reliably fixed.

Furthermore, the structure is simple, and by simply butting the adapter body constituent members 10a and 10b together and fitting the connecting ring 15 outward, the adapter body constituent member 1
0a and 10b can be easily assembled.

In the above embodiment, the connecting ring 15 was made of stainless steel, but it may be made of other metals. Furthermore, although the receiver 11 is of the screw type, it may also be of the bayonet type. Furthermore, the adapter body 10 includes adapter body structural members 10a and 10b.
It may not be divided into two parts, but may be formed integrally.

[Effect of idea]

According to the light bulb adapter of this invention, the adapter body and the reflective shade are connected by a connecting ring, and the cap is attached to the cap mounting portion at the base of the adapter body.
Then, the light bulb is inserted into the receiver of the adapter body through the light bulb insertion hole of the reflective shade, and the base is attached to an existing lighting fixture for use.

Since the metal connecting ring is fitted over the adapter body and the reflective shade, it can absorb the difference in expansion between the adapter body and the reflective shade caused by the radiant heat of the light bulb.
Therefore, even if the adapter body and the reflective shade have different coefficients of thermal expansion, damage to the adapter body or the reflective shade can be prevented. Furthermore, since the connecting ring is made of metal, the radiant heat of the light bulb is radiated through the connecting ring, reducing the temperature of the bulb sealing part and prolonging the life of the light bulb.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of this invention, Fig. 2 is an exploded perspective view of the adapter body, connecting ring, and base, Fig. 3 is an exploded perspective view of the holder and conductive fitting, and Fig. 4 is an exploded perspective view of the adapter body, connecting ring, and base. FIG. 5 is a side view of the conventional example, FIG. 6 is an exploded perspective view of the middle body, and FIG. 7 is a perspective view of the electrode fitting. 10...adapter body, 11...receiver, 12...
...Base mounting part, 13...Light bulb insertion hole, 14...
Reflective hat, 15...connecting ring, 16...cap.

Claims (1)

[Scope of utility model registration request] An adapter body having a receiver at the tip and a base mounting part formed at the base, a reflective shade arranged at the tip of the adapter body and having a light bulb insertion hole at a position facing the receiver, and the reflective shade. A light bulb adapter comprising: a metal connecting ring that is fitted over the adapter main body and connects the adapter main body and the reflective shade; and a cap attached to the cap mounting portion.