JP2531955Y2 - Light bulb socket - Google Patents

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 used for a wedge-based light bulb, and more particularly to a light bulb socket for easily attaching and detaching a light bulb and stably holding the light bulb.

[0002]

2. Description of the Related Art Conventionally, a light bulb socket of a wedge-based light bulb used for a vehicular lamp is a contact provided inside a socket body, and is electrically connected to a lead wire provided on a base portion of the light bulb so as to conduct electricity. Has become. Also, a part of the contact is provided with a locking piece for engaging the engaging projection provided on the base portion of the bulb to hold the bulb in the socket. FIG. 5 is a perspective view showing an example of a conventional contact, which is formed by cutting and bending a metal plate material. The contact 3B has a side edge piece 31 for fixing the contact inside the socket body, which is formed straight upward, and a contact piece 33 which contacts the lead wire of the electric bulb bent downward at an adjacent portion thereof. Further, a locking piece 34 that engages with the engaging projection of the base portion of the electric bulb is bent upward. Further, a cord 9 for connecting to an external power supply or the like is caulked and fixed below the contact 3B.

[0003]

In such a conventional light bulb socket, the contact 3B is cut from one metal plate.
The contact piece 33 and the locking piece 34 are formed to have a narrow width corresponding to the lead wire and the engaging projection provided on the base portion of the bulb. For this reason, there is a limit in increasing the spring force of the contact piece 33 and the locking piece 34. In particular, the locking piece 34 has a small engaging force with respect to the engaging projection, and the locking piece 34 can be easily moved rearward. It is easy to tilt and disengage from the engagement projection, and it is difficult to stably hold the light bulb in the socket. On the other hand, it is conceivable to use a thick material for the metal plate material constituting the contact, but it is difficult to process the metal plate, and the spring force of the locking piece 34 increases. The operability at the time of attaching and detaching the light bulb while performing it is deteriorated. SUMMARY OF THE INVENTION It is an object of the present invention to provide a light bulb socket capable of holding a light bulb stably while easily attaching and detaching the light bulb.

[0004]

The light bulb socket of the present invention has a flat plate shape on the rear side of the locking piece provided on a part of the contact.
And locking along the same plane direction as the locking piece
A reinforcing piece is formed along the entire surface of the piece by bending a part of the contact.

[0005]

According to the present invention, the reinforcing piece prevents the locking piece from being tilted rearward and prevents the locking piece from easily coming off the engaging projection of the electric bulb, thereby improving the holding strength.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 and 2 are views showing one embodiment of the present invention.
Here, an example in which the present invention is applied to a socket for a wedge-based bulb having a double filament structure is shown. FIG. 1 is a partially exploded perspective view with a part broken away, and FIG. 2 is a cross-sectional view in a state where a light bulb is mounted. In these figures, reference numeral 7 denotes a wedge-based bulb, which has a flat base portion 72 made of glass integrally with a bulb portion 71, and a double filament (bulb) in the bulb portion 71 is provided on both side surfaces of the base portion 72. (Not shown), and two pairs of lead wires 73 are exposed and provided along the opposite surfaces of the base portion 72. Engagement projections 74 are integrally formed on both side surfaces of the base portion 72 so as to engage with engagement pieces 34 and 42 of the contacts 3 and 4 to be described later and prevent them from falling off.

The light bulb socket 1 includes a socket body 2 formed of an insulating material such as a resin, and contacts made of a metal material contained in the socket body 2, here, first to third three contacts 3. 4 and 5. The socket body 2 has a flat tubular bulb mounting portion 21 corresponding to the base portion 72 of the bulb 7, and the contacts 3, 4, and 5 are provided inside the bulb mounting portion 21, and the distal end opening is provided. The wedge base bulb 7 is configured to fit and support the base 72.

Further, a circular sleeve 22 is formed integrally with the lower part of the socket body 2, and a disk-shaped bush 8 made of rubber or the like is press-fitted into the sleeve 22 to seal the inside of the sleeve 22. be able to. The bush 8 is provided with a hole 81 through which the cord 9 connected to the contacts 3, 4, 5 is inserted. In addition, the socket body 2 has a circular flange 23 and a cylindrical portion 24 connected thereto at an intermediate portion on the outer side, and an annular gasket (not shown) is fitted on the flange 23. A fitting projection 25 to be fitted to an opening edge of a lamp body (not shown) is integrally formed on the outer peripheral surface, and the flange 23, the gasket, and the fitting projection 25 constitute a bayonet-structured socket mounting portion.

By the way, the three contacts 3, 4,
5 are formed by bending into different shapes. The first contact 3 is bent in a U-shape, and a part of the first contact 3 is provided with a side edge piece 31 fitted into the bulb mounting part 21, and a cut-and-raised piece 32 provided on a part thereof is used. It is fixed in the bulb mounting part 21. On both side pieces, contact pieces 33 that are respectively in contact with the lead wires 73 of the light bulb 7 are formed by bending, and on one side piece, locking pieces that are engaged with the engaging projections 74 of the electrode base portion 72. 34 is formed by bending. Further, as shown in an enlarged view in FIG. 3, an elongated portion is provided in a part of the contact 3 and is bent in the lateral direction, so that the reinforcing piece 35 standing upright along the rear side of the locking piece 34 is provided. Provided.

The second contact 4 has a cut-and-raised piece 41 for fixing it in the bulb mounting portion 21 at a part thereof, and an engaging projection 7 provided on the side opposite to the base 72 of the bulb 7.
A locking piece 42 to be engaged with the contact piece 4 is formed, and a reinforcing piece 43 is formed on the rear side of the locking piece 42 by bending a part of the elongated portion of the contact 4 in the lateral direction. Although not clearly shown in the drawing, the second contact 4 also has a bent contact piece that is in contact with the lead wire 73 of the light bulb. Similarly, the third contact 5 has a cut-and-raised piece 51 for fixing it in the bulb mounting portion 21 at a part thereof and a contact piece 52 to be brought into contact with the lead wire 73 of the bulb 7. A cord 9 is fixed to the three contacts 3, 4, 5 by caulking, and the cord 9 is led out of the socket body 2 through the hole 81 of the bush 8.

According to this configuration, when the wedge-based bulb 7 is fitted into the bulb mounting portion 21, the contact pieces 33, 52 of the first and third contacts 3, 5 are respectively connected to the lead wires of the bulb 7. The electric current is supplied by being brought into contact with 73. At the same time, the engaging pieces 34 and 42 of the first and second contacts 3 and 4 are engaged with the upper edge of the engaging protrusion 74 of the light bulb 7, thereby holding the light bulb 7 in the light bulb mounting portion 21. In this case, since the locking pieces 34 and 42 are formed of the same material and dimensions as the conventional one, the spring force thereof is not excessively large.
The attachment and detachment of the light bulb 7 can be easily performed. On the other hand, the locking pieces 34, 42 of the contacts 3, 4
Since the reinforcing pieces 35, 43 are provided along the rear side, the reinforcing pieces 35, 43 prevent the locking pieces 34, 42 from tilting more than necessary to the rear side, and the tilting of the locking pieces 34, 42 is prevented. Directional strength is increased. Accordingly, the engaging force of the bulb 7 with the base 72 is increased, and the engaging projection 74 is prevented from being deformed and disengaged from the locking pieces 34, 42, and the holding strength of the bulb 7 is increased to stably hold the bulb 7. It is possible to do.

Incidentally, like a contact 3A shown in FIG.
The auxiliary piece 35A may be formed by bending an elongated portion provided at a lower portion of the locking piece 34 in the vertical direction and extending along the rear side.
Although not shown, even if the reinforcing piece is provided only at the base portion of the locking piece, the locking piece can be effectively prevented from tilting. Here, the above embodiment shows an example in which the present invention is applied to a light bulb socket for a wedge-based light bulb having a double filament structure, but the present invention can be similarly applied to a socket for a wedge-based light bulb having a single filament structure. .

[0013]

As described above, according to the present invention, the reinforcing piece formed by bending a part of the contact is provided along the rear side of the locking piece provided on a part of the contact. The locking piece can be prevented from tilting backward without increasing the spring force, thereby preventing the locking piece from easily coming off the engagement projection of the bulb without increasing the attaching / detaching force of the bulb. Thus, there is an effect that the holding strength of the bulb can be improved. The reinforcing piece is formed in a flat plate shape, and
Along the entire surface of the locking line along the same plane direction as the direction
The thickness of the contact including the locking piece
The increase is minimal and the space in the socket body is minimized.
There is also an effect that the expansion of the source can be suppressed.

[Brief description of the drawings]

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

FIG. 2 is a vertical cross-sectional view of the socket with a light bulb mounted.

FIG. 3 is an enlarged perspective view of a main part of a first contact.

FIG. 4 is an enlarged perspective view of a main part of a contact according to another embodiment of the present invention.

FIG. 5 is a perspective view of a portion of a conventional light bulb socket contact.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bulb socket 2 Socket main body 3, 4, 5 Contact 7 Bulb 33, 52 Contact piece 72 Base part 34, 42 Locking piece 73 Lead wire 35, 43 Reinforcement piece 74 Engagement projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A locking piece is provided on a part of a contact supported in a socket body, and the locking piece is engaged with an engaging projection provided on a base portion of a wedge-based bulb fitted in the socket body. In the light bulb socket configured to hold the light bulb, a flat reinforcing piece in which a part of a contact is bent at a rear side of the locking piece is formed on a flat surface of the locking piece.
A light bulb socket characterized by being provided along the entire surface of the locking piece along the same plane direction as the direction .