JPH06260253A - Bulb socket - Google Patents

Abstract

PURPOSE:To provide a bulb socket in which parts are commonly used to facilitate the design and manufacture, and the assembling property of a contact to a socket body is improved. CONSTITUTION:A socket body is formed of a bottomed cylindrical outer piece 1 attachable to a lighting fixture and a cylindrical inner piece 2 opened on both the ends to be inserted to the outer piece 1. A contact 3 is nipped by the outer piece 1 and the inner piece 2, whereby a cut piece for preventing the dropping out of the contact is not required, and the assembling property is improved. Further, by changing only the inner piece, this bulb socket is conformable to various bulbs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb socket, and more particularly to a light bulb socket in which socket parts are commonly used for various light bulbs and the assembly is simplified.

[0002]

2. Description of the Related Art Conventionally, a light bulb socket used for a vehicular lamp has a structure in which contacts are internally supported inside a socket body. That is, an axial groove is formed in the peripheral portion of the bottomed cylindrical socket body, and the negative and positive contacts are fitted and supported in the groove. Then, the negative side contact has a part in which the contact piece in the inner diameter direction is projected so as to electrically contact with the peripheral surface of the base of the light bulb fitted in the socket body, and the positive side contact has a part of the socket body. A curved shape is formed along the inner bottom surface so that the positive side electrode provided at the tip of the base of the bulb is brought into contact with the positive electrode.

[0003]

In such a conventional light bulb socket, the negative and positive contacts are fitted and supported in the groove provided in the socket body. However, since the contact size is small, There is a problem that the insertion work is difficult. In addition, in order to prevent the contact from falling out of the groove, a cut-and-raised piece is usually provided on the contact and locked to the inner surface of the groove, so once the contact is fitted into the groove, it becomes difficult to remove it. Another problem is that it is difficult to repair a contact failure.
Furthermore, since the size and shape of the socket body of the conventional light bulb socket are determined according to the light bulb used, it is necessary to design and manufacture the socket body for each different light bulb, which increases the number of socket types. However, there is a problem that manufacturing and management become complicated. An object of the present invention is to provide a light bulb socket which solves such a problem, allows common use of parts, and simplifies assembly.

[0004]

DISCLOSURE OF THE INVENTION An electric bulb socket of the present invention is an outer piece which is formed in a bottomed tubular shape and can be attached to a lamp, and a tubular inner body which is fitted into the outer piece and has openings at both ends. The socket body is composed of the piece,
A contact is sandwiched between the outer piece and the inner piece. In this case, an axial cut groove is formed on the peripheral edge of the inner piece to provide a radially deformable tongue piece, and a part of this tongue piece is fitted into a fitting hole provided on the peripheral surface of the outer piece. A fitting protrusion is formed to fit and support the inner piece on the outer piece.

[0005]

According to the present invention, it is possible to support the contact internally by inserting the inner piece into the outer piece after the contact is internally mounted, and to easily detach the contact by removing the inner piece. . In addition, it is possible to use different light bulbs by changing the shape and size of the inner piece.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view of an embodiment of the present invention.
Reference numeral 1 is an outer piece, and 2 is an inner piece, which form a socket body. Reference numeral 3 is a contact provided in the socket body and electrically connected to the light bulb.
The outer piece 1 is shown in plan view in FIG. 2, FIG. 3 and FIG.
As shown in the sectional view taken along the line A-A and the line B-B in FIG. An annular gasket 12 can be supported by 11a. Further, a plurality of engaging protrusions 13 are provided at a plurality of positions on the circumference that are separated from the flange 11 by a predetermined dimension in the axial direction. The flange 11 and the engagement protrusion 13 constitute a bayonet-shaped socket mounting portion, which can be fitted into a socket mounting hole opened in a lamp body (not shown) of the lamp to mount the light bulb socket on the lamp body. . Further, a wing-shaped operation piece 14 for rotating the bulb socket is integrally provided on the bottom surface of the outer piece 1.

Axial contact insertion grooves 15a, 15b, 15c are formed at three locations on the circumference of the outer piece 1, and these contact insertion grooves 15a, 15b, 15c are respectively provided with a negative contact 31 which will be described in detail later. Two positive contacts 32, 33 can be fitted. Further, at two circumferential positions different from those of the grooves 15a, 15b, 15c, there are axial guide ridges 16 protruding in the inner diameter direction.
Further, rectangular fitting holes 17 penetrating in the radial direction are formed at two circumferential positions different from the above, and fitting holes 24, which will be described later, of the inner piece 2 can be fitted therein.

The inner piece 2 is shown in plan view in FIG.
As shown in the sectional view taken along the line CC in FIG. 6, the outer piece 1 is formed into a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the outer piece 1. A guide groove 21 corresponding to the guide ridge 16 of the outer piece 1 is axially formed at two locations on the circumference, and a cut groove formed axially from the upper end opening at two different circumferences. 22 by tongue 2
3, the tongue piece 23 is integrally formed with a fitting projection 24 fitted into the fitting hole 17 of the outer piece 1 on the outer surface thereof. The tongue piece 23 is given some elasticity in the radial direction with respect to the peripheral wall of the inner piece 2 by the cut groove 22, and the fitting projection 24 can be moved in the radial direction by this elasticity. In addition, a contact groove 25 in the form of a kerf corresponding to the insertion groove 15a in which the negative side contact of the outer piece 1 is housed is axially formed in a part of a different circumference of the inner piece 2. Further, on the inner surface of the inner piece 2, there is formed an engagement groove 26 having a J-shaped upper edge into which an engagement protrusion provided on the base surface of a light bulb (not shown) is inserted. Further, protrusions 27 for sandwiching the positive side contacts 32 and 33 between the inner piece 2 and the outer piece 1 are formed at two positions on the circumference of the inner piece 2.

As shown in FIG. 1, the contact 3 is formed by bending an elongated conductive plate material having a spring property. The contact 31 on the negative side has a contact piece 31a protruding outward through the insertion groove of the outer piece at one end, and a contact piece 31b protruding inside the inner piece through the contact groove of the inner piece at the other end side. Have A cut and raised piece 31c is formed at the lower end. On the other hand, the two positive contacts 32, 33 have contact pieces 32a, 33a protruding to the outside through the insertion groove of the outer piece at one end, and bent in an S shape at the other end to form a bulb base. It has contact pieces 32b and 33b which are brought into contact with the positive electrode provided at the apex position of.

Therefore, the light bulb socket constructed by using the outer piece 1, the inner piece 2 and the contact 3 has the outer piece 1 as shown in the plan view of FIG. Insertion groove 15b, 1
The positive side contacts 32 and 33 are inserted into 5c, the negative side contact 31 is locked to the inner piece 2, and then the inner piece 2 is fitted into the outer piece 1 to enable the assembly. At this time, after positioning in the circumferential direction so that the guide groove 21 of the inner piece 2 fits into the guide protrusion 16 of the outer piece 1, the inner piece 2 is moved in the axial direction while the inner piece 2 is inside. The tongue piece 23 of the inner piece 2 elastically deforms in the inner diameter direction and the fitting protrusion 24 provided on the tongue piece 23 rides over the inner edge of the outer piece 1 and fits into the fitting hole 17 from the inside. However, the inner piece 2 can be integrated with the outer piece 1. In this state, each contact 3 is placed between the inner piece 2 and the outer piece 1.
1, 32, 33 are sandwiched and firmly supported in the outer piece 1. At this time, the negative side contact 31 causes the contact piece 31a to protrude to the outside from the insertion groove 15a of the outer piece 1, and the contact piece 31b to protrude to the inside of the inner piece 2 through the contact groove 25 of the inner piece 2.
The positive contacts 32 and 33 are contact pieces 32b and 33b.
The contact piece 32 on the inner bottom surface of the outer piece 1.
The a and 33a are projected to the outside through the insertion grooves 15b and 15c.

In this light bulb socket, the base of the light bulb is inserted into the inner piece 2 and the engaging groove of the inner piece 2 is engaged with the engaging projection of the base to attach the light bulb to the light bulb socket. Is possible. In this state, the peripheral surface of the base is the contact piece 31b of the negative contact 31.
, And the two positive electrodes of the base are brought into contact with the contact pieces 32b, 33b of the positive contacts 32, 33, respectively, so that electrical connection is made. Also, by using the socket mounting portion of the bayonet structure formed of the flange 11 and the engaging projection 13 provided on the outer piece 1 to be mounted on the lamp body of the lamp not shown, the wiring portion provided on the lamp side. The contact pieces 31a, 32a, 33a come into contact with each other to establish electrical connection.

Therefore, in this light bulb socket, when assembling the contact 3, the contact 3 is simply inserted into the insertion grooves 15b and 15c of the outer piece 1 and the insertion groove 25 of the inner piece 2, and then the inner piece 2 is placed on the outer piece. It only needs to be fitted in the piece 1, and the assembling property is improved. Further, since the contact is sandwiched between the inner piece and the outer piece, it is easy to assemble the contact, and it is also easy to remove the contact once attached for repair or the like. When using light bulbs with different caps, the same outer piece can be used by using inner pieces with the same outer diameter but different inner diameters. All that is required is to facilitate manufacturing and management. Incidentally, even when using a baseless bulb without a base, for example, a wedge base bulb, a shape corresponding to this,
All you have to do is prepare an inner piece of dimensions.

[0013]

As described above, according to the present invention, an outer piece formed in a cylindrical shape with a bottom, an inner piece fitted in the outer piece, and sandwiched between the outer piece and the inner piece. Since the light bulb socket is configured with the contacts, it is not necessary to provide a structure for preventing the contacts from falling off, the structure of the contacts can be simplified, and the contacts can be easily attached and detached. The assemblability of can be improved. In addition, various light bulbs can be dealt with by simply changing the inner piece to a different one, and the outer piece can be commonly used to simplify the design and manufacture of the light bulb socket.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view of an embodiment of the present invention.

FIG. 2 is a plan view of an outer piece.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a plan view of an inner piece.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a plan view of a light bulb socket.

8 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 1 Outer piece 2 Inner piece 3 Contact 15a, 15b, 15c Contact insertion groove 16 Guide ridge 17 Fitting hole 21 Guide groove 24 Fitting protrusion 25 Contact groove 31 Negative contact 32, 33 Positive contact

Claims (2)

[Claims] 1. A socket body is constituted by an outer piece formed in a bottomed tubular shape and attachable to a lamp, and a tubular inner piece fitted in the outer piece and having openings at both ends. A light bulb socket characterized in that a contact is sandwiched between the piece and the inner piece. 2. An inner piece is provided with a tongue piece which is formed in a circumferential direction by forming a groove in the axial direction and is deformable in a radial direction. A part of the tongue piece is provided with a fitting hole provided on a peripheral surface of the outer piece. 2. The electric bulb socket according to claim 1, wherein a fitting protrusion to be fitted is formed.