JPH06111900A - Socket contact structure and lighting fixture - Google Patents

Abstract

PURPOSE:To provide a socket which ensures electric connection between the rear end of a base and the center contact piece by making a round hole in the center of the center contact piece. CONSTITUTION:A round hole 33 is provided in a center contact piece 29 to scrape off an oxide film at the rear end 7a when the base 9 of a lamp 1 is threaded into a threaded hole 27a in a cylinder 27. By threading the base 9 into the threaded hole 27a in the cylinder 27, the lamp 1 is mechanically mounted on and electrically connected to a socket 23. When the base 9 is further turned in toward the center contact piece 29, the oxide film formed on the partial silver portion at the rear end 7a of the base 9 is rotatingly scraped off at the opening edge of the round hole 33 so that the partial silver portion and the opening edge of the round hole 33 in the center contact piece 29 have mutually linear contact. It is thus possible to improve an electric connection between the rear end 7a of the base 9 and the socket center contact piece 29 in reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a socket contact structure for mounting a so-called Edison base lamp and a luminaire using this socket contact structure.

[0002]

2. Description of the Related Art FIG. 6 shows a so-called Edison base lamp (hereinafter referred to as "lamp") 1 and a socket 3 in which the lamp 1 is mounted. The lamp 1 includes a light emitting portion 5 in which a filament (not shown) is enclosed, a support portion 7 made of porcelain for supporting the light emitting portion 5, and a screw-type base 9. The outer peripheral surface of the male screw portion of the base 9 serves as a first electrode, and the rear end portion 7a serves as a second electrode. Such a base 9 is used for the socket 3 that is assembled in advance to the lighting equipment.
Be attached to.

The socket 3 is a porcelain socket body 11
And the screw hole 13a arranged in the socket body 11
And a center contact piece 15 arranged at the bottom of the cylinder body 13, and a compression coil spring 17 for urging the center contact piece 15 toward the cylinder body 13 side. The tubular body 13 also serves as an electrode, and is in electrical contact with the outer circumference of the male screw as the first electrode. Further, as shown in FIG. 7, the center contact piece 15 has a dish shape in which a recess 15a is formed in the center, and the bottom end 15b of the recess 15a is brought into contact with the rear end 7a of the base 9 to be electrically connected. It

Then, the base 9 of the lamp 1 is screwed into the screw hole of the cylindrical body 13 so that the lamp 1 is mechanically mounted in the socket 3 and electrically connected.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the rear end portion 7a is generally formed of silver solder, it is easily oxidized and an oxide film is formed on the surface before shipping. For this reason, it is mounted in the socket 3 and the rear end portion 7 of the base 9 is
Even if a contacts the center contact piece 15, it is in contact with the center contact piece 15 through the oxide film which is a non-conductor, so that conduction failure occurs.

Therefore, as shown in FIG.
A projection 19 having a sharp tip is formed at the center of the bottom portion 15b of the bottom portion 15b, and the oxide coating on the silver brazing portion of the rear end 7a is pierced to ensure electrical conduction between the silver brazing portion and the center contact piece 15. Is proposed.

However, in this case, since the silver brazing portion of the base and the central contact piece 15 of the socket are in point contact with each other, there is a possibility that they may separate due to vibration or the like and a conduction failure may occur, resulting in reliability in electrical connection. Lacks sex.

[0008] Therefore, an object of the present invention is to provide a socket contact structure and a lighting device capable of reliably electrically connecting the rear end portion and the center contact piece.

[0009]

In order to achieve the above object, the invention of claim 1 is directed to a socket body, a tubular body provided in the socket body and having a screw hole into which a base of a lamp is screwed, and the tubular body. In the socket contact structure in which the lamp is mounted in the socket that is arranged at the bottom of the body and has the center contact piece to which the rear end of the base is electrically connected, when the base of the lamp is screwed into the screw hole of the cylinder The center contact piece is provided with a scraping means for scraping off the oxide film on the rear end of the die.

In the socket contact structure according to claim 2,
The scraping means according to claim 1 is a round hole provided in the central portion of the central contact piece.

A lighting fixture according to a third aspect of the present invention has the socket contact structure according to the first aspect.

[0012]

According to the first aspect of the invention, when the lamp cap is screwed into the screw hole of the cylindrical body and the rear end portion is brought into contact with the center contact piece, and further screwed, the cap is removed by the scraping means. The oxide film on the rear end portion is scraped off. As a result, the rear end portion of the die and the center contact piece are surely brought into contact with each other.

According to the second aspect of the present invention, when the base is screwed into the screw hole of the cylindrical body, the rear end of the base comes into contact with the round hole, and the rear end is formed at the opening edge of the round hole. The oxide film of the portion is scraped off, and the rear end portion of the die and the center contact piece are in line contact with each other, so that the connection is ensured electrically.

In the lighting equipment according to the third aspect of the invention, the base of the lamp is screwed into the screw hole of the cylindrical body in the socket body,
When the rear end portion contacts the center contact piece and is further screwed, the oxide film at the rear end portion is scraped off by the scraping means. This ensures that the rear end portion and the center contact piece are connected.

[0015]

Embodiments of the socket contact structure and the lighting equipment according to the present invention will be described below. FIG. 1 shows a socket 23 and a lamp 1 to which a socket contact structure according to the present invention is applied. 2 and 3 show the center contact piece and the rear end of the lamp. 3 and 4 show a lighting device 21 to which a socket contact structure is applied.

As shown in FIG. 1, the socket 23 comprises a porcelain socket main body 25 and a cylindrical body 27 having a screw hole 27a which is arranged in the socket main body 25 and into which the base 9 of the lamp 1 is screwed. And the center contact piece 2 arranged at the bottom of the cylindrical body 27 and electrically connected to the rear end portion 7a of the mouthpiece 9.
9 and the compression coil spring 17 for urging the center contact piece 29 toward the cylinder 27 side.

As shown in FIG. 2, the center contact piece 29 has a recess 29a formed in the center thereof, and the recess 29a has a bottom portion at the rear end thereof when the base 9 of the lamp 7 is screwed into the cylinder 27. 7
A round hole 33 is formed as a scraping means for scraping off the oxide film 31 of a. As shown in FIGS. 4 and 5, the luminaire 21 using such a socket contact structure is a so-called spotlight that is attached to the ceiling wall 35 and is embedded in the ceiling wall 39 and opens downward. The socket 23 is housed in the instrument main body 37 in which the flange portion 35 is formed on the edge portion of the opening portion 37. A reflector 41 is attached to the periphery of the socket 23 in the instrument body 37 by a reflector attachment spring 43. Further, an attachment spring 45 for fixing the instrument body 37 to the ceiling wall 39 is provided outside the instrument body 37.

Next, the case of mounting the lamp 1 in the socket 23 will be described. First, the base 9 is screwed into the screw hole 27a of the cylinder 27. The rear end portion 7a has a central contact piece 29.
When the base 9 is further screwed into the screw hole 27a after being contacted with, and the base 9 is screwed in the direction of the center contact piece 29, the base 9
The oxide film 31 formed on the silver brazing portion of the rear end portion 7a is scraped off by the opening edge 33a of the round hole 33 while rotating, and as shown in FIG.
Line contact with the opening edge 33a of the round hole 33. This makes it possible to improve reliability in electrical connection.

The opening edges 33a of the round holes 33 do not have to be horizontally opposed to each other and may be inclined in the mounting direction of the base 9. According to this structure, the contact area with the silver braces can be increased. it can.

Further, although the present embodiment has described the connection of the base of the Edison base lamp, the center contact piece for scraping off the oxide film of the silver braze can be applied to other applications, for example, as an electrical contact portion of a lifting type lighting fixture. It is also effective when used.

[0021]

As described above, according to the present invention, the center contact piece is provided with the scraping means for scraping off the oxide film at the rear end portion when the lamp base is screwed into the screw hole of the cylindrical body. , Make sure that the center contact piece and the rear end are electrically connected.
Therefore, reliability in electrical connection can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a socket to which a socket contact structure according to the present invention is applied and a lamp mounted on the socket.

2A and 2B show a center contact piece of a socket contact structure of the present invention, FIG. 2A is a perspective view showing an appearance, and FIG. 2B is a sectional view.

FIG. 3 is an enlarged cross-sectional view showing the relationship between the round hole portion of the center contact piece and the oxide film on the rear end portion of the socket contact structure of the present invention.

FIG. 4 is a perspective view showing a lighting fixture including a socket to which the socket contact structure according to the present invention is applied.

FIG. 5 is a cross-sectional view showing a lighting fixture including a socket to which the socket contact structure according to the present invention is applied.

FIG. 6 is an explanatory view showing a cross section of a conventional lamp and a socket in which the lamp is mounted.

FIG. 7 shows a conventional center contact piece, (a) is a perspective view showing an external appearance, and (b) is a sectional view.

8A and 8B show another conventional center contact piece, in which FIG. 8A is a perspective view showing an appearance, and FIG. 8B is a sectional view.

[Explanation of symbols]

 1 Lamp 9 Base 21 Lighting Fixture 23 Socket 25 Socket Main Body 27 Cylindrical Body 27a Screw Hole 29 Center Contact Piece 31 Oxide Coating 33 Round Hole 33a Opening Edge

Claims (3)

[Claims] 1. A socket body, a tube body provided in the socket body and having a screw hole into which a base of a lamp is screwed, and a rear end portion of the base body, which is disposed at a bottom portion of the tube, is electrically connected. In a socket contact structure for mounting a lamp in a socket consisting of a central contact piece, when the base of the lamp is screwed into the screw hole of the cylindrical body, a scraping means for scraping off an oxide film on the rear end of the base, A socket contact structure provided on the center contact piece. 2. The socket contact structure according to claim 1, wherein the scraping means is a round hole provided in a central portion of the central contact piece. 3. A luminaire having the socket contact structure according to claim 1.