JPS60180079A - Socket for baseless bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a socket for a baseless light bulb that is mounted on a mounting board such as a printed wiring board.

[Technical background of the invention]

Various types of sockets for baseless metal light bulbs have been proposed and put into practical use. Generally, this type of socket is
A socket body made of synthetic resin is provided with a knob part and a 7-run part, and a clamping piece is provided facing the 7-run part at a distance. After inserting the socket main body into the socket mounting hole of the mounting board, by rotating it in a predetermined direction (usually a right-handed screw direction), the peripheral edge of the socket mounting hole is inserted between the above-mentioned 7 run section and the clamping piece. It is designed to be clamped to secure the socket. In addition, a contact fitting that electrically contacts the external conductor of the light bulb is inserted into the socket body, and the power supply terminal portion of this contact fitting is connected to the above-mentioned 7.
It protrudes above the surface of the runnopart. When the socket main body is mounted in the socket mounting hole, the power supply terminal portion comes into contact with the conductive surface of the mounting board, thereby establishing an electrical connection.

[Problems with background technology]

As mentioned above, conventional baseless sockets for light bulbs are supported by pressure contact friction caused by sandwiching the mounting board between the 7-run part and the clamping piece. In areas that are easily affected, the socket may rotate in the opposite direction when installed due to the frictional force between the 7-run part and the clamping piece alone, causing contact misalignment on the printed wiring board, and in extreme cases. may cause it to fall out of the socket mounting hole. In addition, when maintaining mechanical support and electrical contact with a conductive surface such as copper foil using the pressure contact force of the power supply terminal on a thin mounting board such as a flexible printed wiring board, it is necessary to use the reverse direction as described above. When torque is applied, excessive force is applied to the copper foil, which can cause problems such as scraping and peeling of the copper foil.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its purpose is to provide a socket for a baseless metal light bulb that can prevent the occurrence of loosening, falling off, contact misalignment, etc. due to vibration when installed. It is in.

[Summary of the invention]

The gist of the present invention is to provide a socket body having a light bulb insertion hole and a pair of contact fittings mounted in the light bulb insertion hole, a flange portion formed on the socket body and abutting against a mounting board surface, and In the socket for a baseless metal light bulb, the socket is provided with a clamping piece that is spaced apart from the 7-run no. part and clamps the mounting board between the 7-ran no.
The surface of the run section is also provided with a detent protrusion that slightly protrudes toward the mounting board surface.

According to the baseless socket for light bulbs having the above structure, when the socket is mounted on the mounting board, the detent projection bites elastically into the surface of the mounting board, or the detent projection is cut into a notch provided in the socket mounting hole. By engaging with the edge of the socket, etc., the socket becomes locked, and the socket can be prevented from rotating in the opposite direction.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, 1 indicates a mounting board such as a printed wiring board, etc. 0 This mounting board 1 is
For example, it is installed in automobile instrument panels and other equipment,
A socket mounting hole 2 is provided.

The mounting board 1 is provided with a pair of contact fittings 5, 5 to which a baseless metal bulb socket 3 is removably attached. These contact fittings 5, 5 are
It is inserted into a light bulb insertion hole 6 formed in the socket body 4, so as to clamp the base of the baseless metal light bulb 7 and to make electrical contact with the external conductors 8, 8 drawn out from the light bulb 7. It has become. In addition, the power supply terminal portions 9, 9 of the contact fittings 5, 5 protrude outward from the flange portion 11 below,
It comes into elastic contact with a conductive surface (not shown) such as copper foil arranged on the mounting board surface 1a.

Note that the above configuration may be the same as the conventional one.

On the other hand, the socket main body 4 includes a seven-runway portion 11 that contacts the mounting board surface 1a, a knob portion 12, a body portion 13 that is inserted into the socket mounting hole 2, and a clamping piece 14 that protrudes from the body portion 13. 14, and a detent protrusion 15.15 provided on the seven lannge portion 11.

The clamping piece 14.14 has a reed at a position facing away from the flange part 11, and is adapted to clamp the mounting board 1 between the flange part 11 and the clamping piece 14.14.

Moreover, between each clamping piece 14.14 and the flange part 11,
A stop horn and a wall 16, 16 are respectively formed at the rear side in the direction of rotation when the socket is mounted. These stopper walls 16 .
17a, it has the function of preventing further rotation of the socket.

Further, the return stop projection 15.15 has its tip 15 a
+15 a is the surface of the flange part 11! llS.

It is designed to protrude slightly toward the mounting board surface.

More specifically, each of the detent projections 15.15 is a thin cantilevered elastic piece formed by cutting off a part of the 7-run wall located near the rear side of the strami R walls 16, 16. At the same time, it is designed to protrude obliquely toward the rear side in the direction of rotation of the socket.

The distance L (see FIG. 4) between the tip position of the return stop projection 15.15 and the stopper wall 16.16 is equal to or equal to the groove length 1.1 of the notch 17.17, respectively. Each dimensional relationship is set so that it is slightly shorter than 1.1.

The baseless metal light bulb socket 3 having the above structure is inserted into the socket mounting hole 2 in the same manner as conventional products, with the base of the light bulb 7 inserted into the light bulb insertion hole 6. That is, as shown in FIG. 4, the clamping pieces 14.degree. 1.4 are inserted into the notches 1.7 and 27, and when the flange section 11 comes into contact with the mounting board surface 1a, they are rotated in the right-handed screw direction. By doing this, the mounting board 1 is clamped between the flange portion 11 and the clamping piece 14.14, and the stopper wall 16.1
The rotation stops at the position where it hits point 6, resulting in the state shown in FIG. In this state, the tip 15 of the detent projection
apl 5 & slightly protrudes toward the surface of the mounting board due to elastic force, and becomes capable of engaging with the edges 17b, 17b of the notch.

Therefore, even if torque is applied to the socket in the opposite direction to that when it is installed due to the influence of vibration, for example, the return stop protrusion 15,
15 prevents the socket from rotating, thereby preventing contact points from shifting, loosening of the socket, and falling off.

Further, since the rotation of the socket can be suppressed by the detent projection 15.15 and the stopper wall 16.16 as described above, the power supply terminal portions 9, 9 relative to the conductive surface of the mounting board 1
This prevents excessive torque from being applied to the contact area, and prevents the copper foil from being scraped or peeled off. Therefore, it is also effective for thin mounting substrates such as flexible printed wiring boards.

When it is necessary to remove the socket, such as when replacing a light bulb, the socket body 4 is forcibly rotated in the opposite direction to the above using the knob 12, and the detent protrusion 15 is removed by applying a torque of more than a predetermined value. ．． '15vc
Simply disengage the socket and pull it out from the socket mounting hole 2.

In the above embodiment, the detent protrusion 15° 15 is engaged with the notch 17.17 for inserting the clamp outwardly to form a detent, but in carrying out the present invention, for example, the notch A locking hole or a recess may be formed at a position different from the portion 17.degree. 17, and the tip 15a+15a of the return stop projection may be engaged with the locking hole or recess. In this case, the detent projection would be provided at a different position than in the above embodiment, or the length of the projection would be increased.

Furthermore, as shown in FIG. 6, a return stopper projection 15 having a tapered surface 20 at its tip may be employed. In this case, it is relatively easy to reversely rotate the socket when removing it. can.

In addition, in the case where the tip of the protrusion is sharpened as in this example, since the tip 15a bites into the mounting board surface and can be expected to have a detent effect, there is no need to separately provide a locking hole or recess. In some cases.

Further, the number of return stop projections may be one or 31 or more. Further, it does not necessarily have to be a cantilevered elastic piece; in short, the present invention can be applied as long as it has a shape that can bite into the surface of the mounting board, or a shape that can be engaged with a locking hole, a recess, etc. The intended purpose can be achieved.

〔Effect of the invention〕

As described above, the present invention is highly effective in preventing contacts from shifting, loosening of sockets, and falling out due to vibrations and other causes.

[Brief explanation of drawings]

1 to 5 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 front view, and FIGS. 4 and 5 are mutually exclusive. FIG. 6 is a cross-sectional view of the vicinity of the detent protrusion showing different operating states; FIG. 6 is a cross-sectional view showing a modification of the return screw retaining protrusion. DESCRIPTION OF SYMBOLS 1...Mounting board, 1a...Mounting board surface, 2...Socket mounting hole, 3...Socket for baseless metal bulb, 4...
・Socket body, 1.. Ransor part, 14.. Clamping piece, 15.. Detent projection, 16.. Stop horn f.
Wall, 17...notch. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 5 Figure 4 Figure 6

Claims (1)

[Scope of Claims] (1) A socket body having a light bulb insertion hole and a pair of contact fittings mounted in the light bulb insertion hole, a seven-rung portion formed on the socket body and abutting against the mounting board surface; In the socket for a baseless light bulb, which is provided with a clamping piece that is spaced apart from and opposite to the 7 rung part and clamps the mounting board between the 7 rung part and the 7 rung part, the 7 rung part has a part that is slightly smaller than the surface of the 7 rung part. A socket for a headless metal light bulb, characterized by having a detent protrusion that protrudes from the surface of the mounting board. (2) A stop horn or a wall is provided between the clamping piece and the 7 rung part, located on the rear side in the direction of rotation when the socket is installed, and the above-mentioned detent protrusion is provided near the rear side of the stop horn or wall. The distance ML between the tip of the detent projection and the stopper wall is equal to or slightly shorter than the length t of the notch for inserting the clamping piece provided in the socket mounting hole. The socket for a baseless metal light bulb according to claim 1, characterized in that the socket is hidden. (3) The return retaining protrusion projects obliquely toward the rear side in the direction of rotation when the socket is installed. The socket for a baseless metal light bulb according to claim 1 or 2, characterized in that the socket is a thin elastic piece integrally formed with the flange portion.