JPS6348069Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a socket for a baseless metal light bulb with an improved contact fitting part.

[Technical background of the invention and its problems]

An example of a small baseless metal bulb with a sealing part called a wedge base lamp is the first one.
As shown by reference numeral 1 in the figure, the end of the glass bulb 2 is crushed to form a sealing part 3, and a pair of lead wires 4, 4 are folded back along the sealing part 3. The lead wires 4, 4 are electrically connected to the filament inside the bulb. 5 indicates an exhaust pipe.

Various types of sockets for use in the baseless light bulb 1 have been proposed and put into practical use.
In general, conventional sockets for socketless metal bulbs include a socket body made of synthetic resin that has a bulb insertion hole, and a pair of contact fittings that are inserted into the socket body and sandwich the sealing part of the bulb. The contact fitting simultaneously supports the bulb and makes electrical contact with the lead wire.

By the way, a conventional contact fitting has a pair of elastic contact pieces bent on both sides, and by sandwiching the sealing part of the valve from the thickness direction with the elastic contact pieces, the sealing part At the same time, the lead wire is also clamped.

However, when inserting a light bulb into a socket,
The lead wire may be deformed, or the lead wire 4 may move laterally as shown by the imaginary line A in FIG. In some cases, contact could not be made, resulting in unstable contact.

In order to solve the above problems, some proposals have been made to increase the reliability of contact by changing the shape and structure of the contact fittings, but although they have become more complicated in shape and higher in cost, they are not effective. It is difficult to say that satisfactory sockets have been obtained.

[Purpose of invention]

This idea was made based on the above circumstances,
The purpose is to provide a socket for a baseless light bulb that can maintain good contact with the lead wire and also exhibit the effect of reinforcing the contact fitting.

[Summary of the idea]

The gist of the present invention is to provide a socket for baseless light bulbs that includes a synthetic resin socket body having a light bulb insertion hole, and a pair of contact fittings that are inserted into the socket body and sandwich the sealing part of the bulb. In the socket, the contact fitting includes a pair of elastic contact pieces bent on both sides of the contact fitting and sandwiching the sealing portion of the valve from the thickness direction, and a pair of elastic contact pieces located between these elastic contact pieces and extending outward from the socket body. The present invention is characterized in that it includes a power feeding terminal portion that is bent in a manner similar to that of the power feeding terminal portion, and a convex portion that extends downwardly from the bent portion of the power feeding terminal portion and protrudes inwardly.

According to the above configuration, even if the lead wire is deformed or moved and deviates laterally from the elastic contact piece when inserting a light bulb into a socket, electrical contact with the lead wire is maintained due to the presence of the convex portion. can be maintained, and poor contact can be eliminated. Furthermore, since the convex portion is formed between the elastic contact pieces, the convex portion can function as a reinforcing portion and is also effective in reinforcing the contact fitting. Moreover, since it is sufficient to simply add the above-mentioned convex portion to the contact fitting similar to the conventional one, the structure is not so complicated, and it is easy to implement and can be implemented at low cost.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the baseless light bulb 1 has a crushed sealing part 3 at the end of the glass bulb 2, as described above, and a pair of lead wires 4, 4 are folded back along this sealing part 3. . The above configuration may be the same as the conventional one.

On the other hand, the socket 10 includes a synthetic resin socket body 12 having a light bulb insertion hole 11, and a pair of contact fittings 13, 1 inserted into the socket body 12.
3, and the sealing portion 3 is sandwiched between these contact fittings 13,13.

The socket body 12 has a flange portion 14 protruding from its outer circumferential portion and locking portions 15, 15.
By sandwiching the mounting board 16, it is configured to mechanically support the mounting board 16 and to electrically contact the power supply terminal portions 22, 22 of the contact fittings. Furthermore, insertion grooves 20, 20 are formed that open along the light bulb insertion hole 11, and the flat plate portions 21, 21 of the contact fittings 13, 13 are inserted along these insertion grooves 20, 20. .

Since the contact fittings 13 and 13 have the same structure, one will be explained below as a representative. The contact fitting 13 includes a flat plate part 21, a power supply terminal part 22 integrally formed on the upper end side of the flat plate part 21 in the drawing, and elastic contact pieces 23, 23 bent on both sides. These elastic contact pieces 23, 23 sandwich the sealing part 3 of the valve from the thickness direction, and
At the same time, the lead wires 4 are also clamped to make electrical contact.

Further, on the lower end side of the flat plate part 21 in the drawing, there are locking parts 24, 24 for preventing slippage, and a stopper 25 for regulating the position of the end of the protrusion/sealing part 3 for inserting the contact fitting 13. is formed.

Further, a convex portion 26 is formed downward from the bending portion of the power feeding terminal portion 22 so as to protrude inward. The convex portion 26 is provided so as to protrude so as to face the side wall of the sealing portion 3 of the light bulb 1, that is, so that the convex portions 26, 26 face each other. (See Figures 2 and 3) In this embodiment configured as described above, after the contact fittings 13, 13 are inserted into the socket body 12,
When the sealing part 3 of the light bulb 1 is inserted into the light bulb insertion hole 11, the sealing part 3 is sandwiched between the elastic contact pieces 23, 23, and the lead wires 4, 4 are inserted through the elastic contact pieces 23, 23. Electrical contact is also made at the same time.

Even if the lead wire 4 were to move laterally, for example, as shown by the imaginary line A in FIG. 26 and the lead wire 4 are in contact with each other, and electrical continuity can be maintained. Therefore, poor contact that causes non-lighting can be prevented, and reliability is improved.

Also, by providing the protrusions 26, 26 on the contact fittings 13, 13, the socket 10 can be attached to the mounting board 16.
This has the effect of reinforcing the contact fittings 13, 13 when inserting the lamp, and the presence of the protrusions 26, 26 stabilizes the shape of the contact fittings 13, 13, thereby preventing deformation due to heat during lighting. Very effective in maintaining good contact. Moreover, the convex portions 26, 2
6 has the advantage that it can be integrally formed by pressing or the like when forming the contact fittings 13, 13, and has a simple structure and can be implemented at low cost.

[Effect of idea]

As described above, the present invention has a relatively simple structure, but is extremely effective in improving the reliability of contact with the lead wire, and has the effect of reinforcing the contact fitting.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a plan view of the socket, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a contact fitting. FIG. DESCRIPTION OF SYMBOLS 1...Baseless metal light bulb, 2...Bulb, 3...Sealing part, 4...Lead wire, 10...Socket, 11...
...Light bulb insertion hole, 12...Socket body, 13...
Contact fitting, 22...Power supply terminal portion, 23...Elastic contact piece, 26...Convex portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A socket for a baseless light bulb, comprising a synthetic resin socket body having a light bulb insertion hole, and a pair of contact fittings that are inserted into the socket body and sandwich the sealing part of the bulb. In this case, the contact fitting has a pair of elastic contact pieces that are bent on both sides to sandwich the sealing portion of the valve from the thickness direction, and a pair of elastic contact pieces that are bent outward from the socket body and are located between these elastic contact pieces. A socket for a baseless metal light bulb, comprising a bent power supply terminal part and a convex part that projects inwardly from the bent part of the power supply terminal part downward.