JPH0668363U - Light bulb socket - Google Patents

Abstract

(57) [Summary] [Purpose] In a light bulb socket for mounting a light bulb having a base, the cylinder length of the socket body is shortened to achieve miniaturization. [Structure] A cylindrical socket main body 21 into which a base 11 of a light bulb 1 is inserted, and a positive terminal insertion portion 26 opened in the socket main body 21 in a direction perpendicular to a cylindrical axis of the socket main body.
A positive terminal 30 inserted from the terminal insertion portion and arranged at the inner bottom portion of the socket body, a negative terminal insertion portion 33 provided on the bottom surface of the socket body, and a portion of the circumference of the socket body from the negative terminal insertion portion. By including the minus terminal 36 arranged along the inner side surface and by inserting the plus terminal 30 from the direction perpendicular to the cylinder axis of the socket body 21, the cylinder axis length of the socket body 21 is shortened. To achieve miniaturization.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light bulb socket having a base, and particularly to a light bulb socket with a reduced size.

[0002]

[Prior art]

 FIG. 8 shows an example of a socket for a base bulb. This light bulb socket is provided with a positive terminal 42 that comes into contact with the positive electrode 12 of the light bulb 1 at the bottom of a cylindrical socket body 41 into which the base 11 of the light bulb 1 is inserted, and a part of the peripheral surface of the socket body 41. Has a negative terminal (not shown) that contacts the negative electrode of the light bulb. A part of the negative terminal projects from the inner peripheral surface of the socket body, and is brought into contact with the peripheral surface of the base 11 of the light bulb 1 inserted in the socket body, that is, the negative electrode. Further, the plus terminal 42 is formed by bending an elastic metal piece into an S shape and is brought into contact with the plus electrode 12 provided on the base of the electric bulb with its elastic force. A cord 43 connected to each electrode is pulled out of the socket main body from a cord pull-out portion 44 provided at the bottom of the socket main body 41, and a rubber bushing 45 for waterproofing the inside of the socket is provided in the cord pull-out portion. Is decorated.

[0003]

[Problems to be solved by the device]

 In such a conventional light bulb socket, the plus terminal 42 is inserted through the bottom portion of the socket body 41, and the plus terminal 42 is supported at this insertion portion. For this reason, it is necessary to provide a thick portion enough to support the plus terminal 42 at the bottom of the socket body 41, and the cylinder length of the socket body 41 becomes long. In addition to this, the cord 43 connected to the plus terminal 42 is pulled out from the cord pull-out portion 44 provided at the bottom of the connector body, but this portion requires a tubular portion for housing the rubber bushing 45. Therefore, the cylinder length of the socket body 41 becomes longer. In addition, in order to apply elastic force to the plus terminal 42, in the configuration in which the metal piece is bent and formed into an S shape, in order to obtain the required elastic force, it is necessary to design the H2 dimension shown in the figure to be large. However, in order to secure this dimension, it is necessary to lengthen the cylinder length of the socket body. Therefore, in the conventional light bulb socket, it is difficult to shorten the tube length of the socket body, which is an obstacle to downsizing the light bulb socket. SUMMARY OF THE INVENTION An object of the present invention is to provide a light bulb socket in which the cylinder length of the socket body is shortened so as to be downsized.

[0004]

[Means for Solving the Problems]

 According to the present invention, a cylindrical socket body into which a cap of a light bulb is inserted, a plus terminal insertion portion opened at a bottom portion of the socket body in a direction perpendicular to a cylinder axis of the socket body, and the inside of the socket body from the terminal insertion portion. The positive terminal that is inserted into the socket body and placed on the inner bottom of the socket body, the negative terminal insertion portion that is provided on the bottom surface of the socket body, and from this negative terminal insertion portion along the inner surface of part of the circumference of the socket body. It has a negative terminal to be arranged.

[0005]

【Example】

 Next, the present invention will be described with reference to the drawings. 1 is an exploded perspective view of a part of an embodiment of the present invention. In the figure, reference numeral 1 denotes a base bulb in which two filaments are enclosed in a glass bulb, and a base 11 for supporting the glass bulb has a negative electrode on its peripheral surface and an insulating material at its tip. Two positive electrodes 12 corresponding to each filament are arranged. Further, an engaging pin 13 for locking a light bulb is radially projected on a part of the peripheral surface of the base 11. On the other hand, reference numeral 2 denotes a light bulb socket. A plan view of this light bulb socket is shown in FIG. 2, and a cross-sectional view taken along the line AA and a cross-section taken along the line BB is shown in FIGS. 3 and 4, respectively. A rear view is shown in FIG. In these drawings, the socket main body 21 is formed of a short double-ended cylindrical shape by an insulating material such as resin, and the base 11 of the light bulb 1 is inserted into the opening of the cylinder 22 inside thereof. ing. A J-groove 22a is formed on the inner peripheral surface of the socket body 21 for engaging the engagement pin 12 of the light bulb 1 and locking the light bulb in the socket body. Further, flanges 24 and 25 used when mounting the light bulb socket on a lamp or the like are integrally provided on the outer peripheral surface of the outer cylinder 23 of the socket body 21.

A positive terminal insertion portion 26 is provided on a part of the peripheral surface of the socket main body 21 near the bottom thereof so as to face a direction perpendicular to the cylinder axis of the socket main body. The positive terminal insertion portion 26 has two insertion openings 27a and 27b arranged side by side so that the inner bottom portion of the socket body 21 communicates with the outside. Each of the insertion ports 27a and 27b has an elongated opening shape in the cylinder axis direction of the socket body, and a pair of slits 28 are formed on both sides of the inner side surface of the socket body in the inward and outward directions. Further, a tapered projection 29 is integrally formed on the inner bottom surface of the socket body 21 corresponding to each of the insertion openings 27a and 27b.

Then, the two positive terminals 30 are inserted into the socket body through the respective insertion openings 27a and 27b of the positive terminal insertion portion 26. As shown in FIG. 1, these plus terminals 30 are formed by bending a slender metal plate. A fixing piece 30a provided at one end of the plus terminal 30 is formed in an annular shape and is caulked and fixed to the tip of the plus cord 31. An electrical connection is made with this. In addition, the other end is configured as a contact piece that comes into contact with the positive electrode of the light bulb, and guide pieces 30b projecting on both sides are provided at the base side of the contact piece. It is bent, and further at a position beyond that, it is bent upward at an acute angle to be inclined. Then, a portion 30d on the tip side from the inclined portion 30c is folded back slightly upward at a dimension position slightly shorter than the inner diameter of the socket body 21, and as a whole, the inclined portion 30c is oriented downward. Formed in the shape of. Further, the inclined portion 30c is provided with a square hole 30e into which the tapered projection 29 is fitted.

As shown in FIG. 6A, the plus terminal 30 is inserted into the socket body 21 from the tip thereof through the insertion port 27 a (27 b) of the plus terminal insertion portion 26. At this time, as shown in FIG. 6B, the inclined portion 30c of the contact piece is guided by the tapered surface of the protrusion 29 during the insertion, whereby the posture is gradually adjusted. When it is further inserted, as shown in FIG. 6C, the square hole 30e of the inclined portion 30c is fitted into the projection 29, and the guide piece 30b is positioned in the slit 28. In this state, the positive terminal 30 is socketed. It is supported within the body 21. Further, the oval rubber bushing 32 fitted to the plus cord 31 is fitted to the inner surface of the insertion opening 27a (27b) for waterproofing.

On the other hand, a small-cylindrical negative terminal insertion portion 33 is provided on a part of the circumference of the bottom portion of the socket body 21, and from this negative terminal insertion portion 33 to a part of the circumference of the inner cylinder 22 of the socket body 21. A groove 34 extending in the axial direction is formed. This groove 34 is provided at a position perpendicular to the plane terminal insertion portion 26 in the plane direction, and extends from the bottom of the socket body 21 to a position where a part 21a of the opening is left. The part 21a is configured as a stopper. Further, a lance engagement protrusion 23 a protruding in the inner diameter direction is formed on the inner surface of the outer cylinder 23 facing the groove 34. Further, a semicircular clamper 35 is integrally formed on one side of the minus terminal insertion portion 33 so as to cover the opening thereof. The clamper 35 clamps a minus cord as described later.

A minus terminal 36 is inserted and supported in the groove 34. As shown in FIG. 1, the minus terminal 36 is formed by processing an elongated metal plate having elasticity. The tip portion 36a is bent into a U shape and a bending piece 36b provided at the base end portion is used. Then, it is caulked and fixed to the minus cord 37, and is electrically connected. Further, the intermediate portion is partially notched and then bent and bent to form a lance 36c. When the minus terminal 36 is inserted from the tip side into the minus terminal insertion portion 33 and further inserted into the socket body 21 through the groove 34, the top surface of the U-shaped tip portion 36a comes into contact with the stopper 21a. At this time, the lance 36c engages with the lance engaging projection 23a, and the minus terminal 36 is supported by the socket body 21. In this supported state, the tip portion 36a of the minus terminal 36 is projected in the inner diameter direction from the inner surface of the inner cylinder 22.

Further, a circular rubber bushing 38 is fitted to the minus cord 37, and by fitting it into the opening of the minus terminal insertion portion 33, the inside of the socket is waterproofed. Further, by holding the minus cord 37 pulled out from the minus terminal insertion portion 33 by the semicircular portion of the clamper 35, the minus cord 37 is clamped in a bent state and pulled out from the plus terminal insertion portion 26. It can be pulled out in the same direction as the plus cord 31.

When the light bulb 1 is inserted into the light bulb socket 2 as described above, the negative electrode (peripheral surface) of the base 11 thereof has a tip portion 36 a of the negative terminal 36 as shown by chain lines in FIGS. 3 and 4, respectively. , And the two positive electrodes 12 make contact with the two positive terminals 30, respectively, and the electric bulb 1 is energized. At this time, the contact piece of the plus terminal 30 is bent downward at a position near the base, then bent obliquely upward, and then folded back at a position on the tip side, at three positions in the length direction. Since the shape is sequentially bent in different directions, a sufficient spring force can be obtained even when the height dimension H 1 (see FIG. 3) from the base to the tip is reduced. In particular, since the tapered projection 29 is provided on the bottom surface of the socket body 21 and the inclined portion 30c of the contact piece is supported by the tapered surface, the height dimension H1 can be obtained at the tip end side despite its small size. The elastic force can be increased. As a result, the lengthwise dimension occupied by the positive terminal 30 in the socket main body 21 can be shortened, and the length of the socket main body can be shortened, so that the bulb socket can be miniaturized.

Further, since the plus terminal 30 is inserted from the direction perpendicular to the cylinder axis of the socket body 21 and the plus terminal 30 is supported inside the plus terminal insertion portion 26, It is not necessary to form the bottom portion to be thick, and also in this respect, the length of the socket main body 21 can be shortened and the bulb socket can be downsized. Further, since the plus cord 31 is pulled out from the plus terminal insertion portion 26 which is perpendicular to the cylinder axis of the socket body 21, compared with the case where this cord is pulled out from the bottom portion of the socket body in the cylinder axis direction, the cord is The space required to bend it at a right angle after it is pulled out is no longer necessary, and the space occupied when the bulb socket is attached to the lamp is reduced by that amount, and the same effect as when shortening the bulb socket length is achieved. Obtainable.

Further, as shown in a perspective view of the bottom side of the socket body in FIG. 7, a negative terminal insertion is performed by using a semicircular clamper 35 provided so as to cover the opening of the negative terminal insertion portion 33. By clamping the minus cord 37 pulled out from the part 33, bending the minus cord 37 at a right angle in this clamper 35, and pulling it out in parallel with the plus cord 31, the pulling direction of each cord is unified, and the cord connection process is easy. In addition, the workability of assembling the socket for the lamp can be improved. The above embodiment shows an example in which the present invention is applied to a light bulb socket having two positive electrodes, but it goes without saying that the present invention can be similarly applied to the case where the positive electrode is one socket. .

[0015]

[Effect of device]

 As described above, according to the present invention, since the positive terminal insertion portion is provided in the direction perpendicular to the cylinder axis of the socket body and the plus terminal is mounted and supported from the side direction of the socket body, the plus terminal is inserted in the cylinder axis direction of the socket body. Since the terminal insertion portion is not provided and the bottom of the socket body does not need to be formed thick to support the positive terminal, the cylinder length of the socket body can be shortened and the bulb socket can be downsized.

[Brief description of drawings]

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

FIG. 2 is a plan view of a socket body.

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 rear view of the socket body.

FIG. 6 is a cross-sectional view showing a step of mounting a plus terminal.

FIG. 7 is a perspective view of the socket body viewed from the bottom side.

FIG. 8 is a schematic sectional view of an example of a conventional light bulb socket.

[Explanation of symbols]

 1 Light Bulb 11 Base 12 Positive Electrode 2 Light Bulb Socket 21 Socket Main Body 26 Positive Terminal Insertion Section 28 Slit 29 Protrusion 30 Positive Terminal 33 Negative Terminal Insertion Section 35 Clamper 36 Negative Terminal

Claims (1)

[Scope of utility model registration request] 1. A cylindrical socket body into which a cap of a light bulb is inserted, a positive terminal insertion portion opened at a bottom portion of the socket body in a direction perpendicular to a cylindrical axis of the socket body, and the terminal insertion portion to A positive terminal inserted into the socket body and arranged at the inner bottom portion of the socket body, a negative terminal insertion portion provided on the bottom surface of the socket body, and a portion of the circumference of the socket body from the negative terminal insertion portion. A light bulb socket, comprising: a negative terminal arranged along a side surface.