JP3014032B2 - Connector plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of components such as a contact and a coil spring for biasing a head terminal in a connector plug, and more particularly to a connector plug used for a cigarette lighter connector plug for an automobile. It is.

[0002]

2. Description of the Related Art In recent years, in response to a rapid increase in demand for portable telephones, a power supply and a charger are required when the portable telephone is mounted on a vehicle. Along with that, an automotive connector plug for extracting power from the cigarette lighter connector socket,
Demand is increasing although a DC-DC converter is integrated therein.

Various conventional connector plugs 10 for automobiles have been proposed. The attachment of a contact 13 made of a thin metal plate having conductivity and elasticity is generally performed by a method shown in FIG. 6 or FIG. Was. The contact 13 shown in FIG. 6 includes a linear base 33 and this base 33.
A contact piece 34 extending integrally from the contact piece 34 and a folded piece 36 formed by bending the tip of the contact piece 34 inward,
One (upper side in the figure) is a ground side, and the other (lower side in the figure) is a dummy side. Of these, contact 1 on the ground side
The lead wire 19 of the power cord 20 is connected only to the base 33 of the third power supply. The upper and lower contacts 13 are connected to the base 3.
3 is fitted into the base holding groove 41 of the housing 11, the contact piece 34 is provided so as to protrude slightly outward from the projecting window 12, and the folded piece 36 faces the circuit protection wall 50 and is assembled.

A fuse tube 15 and a conductive coil spring 16 for urging the fuse tube 15 are housed inside the fuse tube holder portion 14. One end of the coil spring 16 is connected to the fuse tube holder. The coil spring 16 protrudes from the end of the portion 14 and is connected to the lead wire 19.
Is urged outward. In addition, 17 is a cap. The housing 11 has a cylindrical shape as a whole when the lead wire 19 of the power cord 20 is simply passed through. However, when the housing 11 has a built-in stabilized power supply circuit, it has a large shape like a chain line. Be composed.

In such a configuration, when inserted into the connector socket 24, the contact piece 34 of the contact 13
Is inserted while smoothly contacting the inner wall of the connector socket 24. Then, the contact piece 34 of the contact 13 is compressed, and the folded piece 36 contacts the circuit protection wall 50.

Next, the contact 13 shown in FIG. 7 has a contact piece portion 34 in which both ends of a base portion 33 and a tip portion 51 are linear, and a curved portion is formed between them.
0 lead wire 19 is connected. And the tip 51
Is inserted into the insertion hole 22, and the base 33 is
Into the base holding groove 41. As in FIG. 6, one (upper side in the figure) is on the ground side and the other (lower side in the figure) is on the dummy side.

In such a configuration, when inserted into the connector socket 24, the contact piece 34 of the contact 13
Are inserted and compressed while smoothly contacting the inner wall of the connector socket 24. Then, the linear tip portion 51 and the base portion 33 are laterally shifted by the insertion hole 22 and the base holding groove 41 to absorb the compression of the contact piece portion 34.

[0008]

The conventional contacts 13 shown in FIGS. 6 and 7 are simply fixed by fitting them into the base holding grooves 41 and the insertion holes 22 of the housing 11, so that the contacts 13 at the time of assembly are not required. Since the number of parts is increased and the assembling work is not only troublesome, but especially in the case of FIG. 6, since the plug 10 is only held in the base holding groove 41, the plug 10 can be inserted into or removed from the socket 24 at the time of insertion and removal. There was a problem of twisting. Also, the contact 13 on the ground side
Since the lead wire 19 is connected, the lead wire 19 becomes an obstacle, and the assembling work is troublesome. Also, since the dummy side contact 13 does not connect the lead wire 19,
There is a risk that the assembling work may fall off, and the assembling work is also troublesome.

In addition, the assembly of the conductive coil spring 16 for urging the fuse tube 15 and the head terminal 18 and the connection with the lead wire 19 are also troublesome.

An object of the present invention is to provide a contact mounting structure for a connector plug which simplifies the connecting and assembling work of the contact 13 and further simplifies the connecting and assembling work of the conductive coil spring 16. It is assumed that.

[0011]

According to the present invention, there is provided a connector plug for a cigarette lighter for an automobile , wherein a contact made of a leaf spring is provided on a plug housing so as to be able to move forward and backward. A narrow metal plate having a base portion 33 and contact piece portions 34 extending from both sides of the base portion 33, and formed in a substantially U-shape,
The fixed piece 37 integral with the base 33 is
And fixed with solder 43 and connected to a circuit pattern.
The connector plug is fitted into the base holding groove 41 of the housing 11 .

[0012]

The contact 13, the coil spring 45 and the like are fixed to the printed circuit board 27, and the circuit element 29 is incorporated therein and housed in the lower housing 11b. When the contact 13 is fixed to the printed circuit board 27, the base 33 is fitted into the base holding groove 41 of the housing 11, and the contact piece 34 is pressed slightly inward to apply the initial pressure. After attaching the printed circuit board 27 to the lower housing 11b, the upper housing 11a is covered and fixed integrally with screws or the like. A cap 17 into which a head terminal 18 is loosely fitted is screwed into a tip of the housing 11. At this time, when the coil spring 45 is screwed into the head terminal 18 so as to be inserted, the head terminal 18 is always projected from the cap 17 by the coil spring 45.

In such a configuration, when inserted into the socket 24 having a large diameter, the contact piece 3 of the contact 13
4 is inserted and removed while smoothly contacting the inner wall of the socket 24. When inserted into the small-diameter socket 24, the contact piece 34 of the contact 13 is inserted and removed while smoothly contacting the inner wall of the connector socket 24 as described above.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 11 denotes a housing having a shape obtained by dividing a cylindrical body into two in the vertical direction, and is composed of an upper housing 11a and a lower housing 11b. By combining these two housings 11a and 11b with each other, the front end of the connector housing 2 is substantially halfway.
The rear end is a base end 26 for accommodating the DC-DC converter 30 mainly composed of the circuit element 29. The shape of the base end portion 26 is such that the mounting side of the power cord 20 gradually increases in diameter, but is not particularly limited to this.

On both sides of the insertion end 25, a projecting window 12 for projecting the contact 13 is formed. Inside the projecting window 12, a circuit protection wall 50 is formed integrally with the housing 11. Have been. The two housings 1
The printed circuit board 27 is housed in the hollow portion 28 formed by 1a and 11b, and is mounted and fixed on the mounting table 42. A circuit element 29 such as a transistor, a capacitor, a resistor, and a choke coil is attached to the printed board 27 to form a DC-DC converter 30.

In addition to the circuit element 29, the contact 13, the coil spring 45, the power cord 20, the power lamp 32 and the like are integrally mounted on the printed board 27. The contact 13 is, as shown in FIG.
A thin metal plate having conductivity and elasticity is formed by bending a base 33 and contact pieces 34 extending from both sides of the base 33 into a substantially U-shape. The base 33 has a fixed piece 3
7, forming a horizontal holding piece 38 and a positioning projection 39,
In the contact pieces 34 on both sides, a spherical portion 35 is formed by bulging outward, and the tip of the contact piece 34 is bent inward to form a folded piece 36. The spherical portion 35 is formed into a spherical shape having an outer diameter substantially equal to or slightly smaller than the inner diameter of the connector socket 24 having a small diameter among the connector sockets 24 to be inserted.

The contact 13 thus formed
The fixing piece 37 is inserted into a substantially central through-hole of the printed board 27, and the tip of the fixed piece 37 protruding from the back surface of the printed board 27 while the horizontal holding piece 38 is in contact with the printed board 27. It is fixed with solder 43 and connected to a circuit pattern.

An end of a coil spring 45 having conductivity and elasticity is inserted into a through hole at the tip of the printed circuit board 27. The end of the coil spring 45 passes through the through hole 46 and Is fixedly attached by solder 43 on the back surface of the chip, and is connected to a chip type fuse 44 via a circuit pattern. A power lamp 32 is fixedly and electrically attached to the corner of the base end of the printed circuit board 27 by solder 43. When the power supply lamp 32 is housed in the housing 11,
One is faced.

The projecting window 12 in the housing 11
A projection 21 for locking the contact 13 bent in advance outward and applying an initial pressure is integrally provided between the circuit protection wall 50 and the circuit protection wall 50. In addition, the circuit protection wall 50
The plug 1 is inserted into the small-diameter socket 24 at the tip of
A contact recess 40 is formed to absorb a large bend at the tip of the contact 13 when 0 is inserted. A cap 17 is screwed into the distal end of the insertion end 25 of the housing 11. The head terminal 18 is loosely fitted in the advance / retreat hole 47 of the cap 17 so as to freely advance and retreat, and is constantly urged forward by the coil spring 45. are doing. The diameter of the cap 17 is formed according to the size of the bimetal 49 of the smallest connector socket 24.

Next, the contacts 13 and the coil springs 45 are fixed to the printed circuit board 27,
-A circuit element 29 for constituting the DC converter 30 is incorporated and housed in the lower housing 11b. At this time, when fixing the contact 13 to the printed circuit board 27,
The base 33 is fitted into the base holding groove 41 of the housing 11, and the contact piece 34 is pressed slightly inward to apply the initial pressure, and the folded piece 36 is pressed to the protrusion 21 and the circuit protection wall 5.
Fit between 0.

The printed circuit board 27 is mounted on the lower housing 11b.
After mounting, the upper housing 11a is covered and fixed integrally with screws or the like. A cap 17 into which the head terminal 18 is loosely fitted is screwed to the tip of the insertion end 25. At this time, the coil spring 45 is connected to the head terminal 18.
Is inserted and screwed together, the head terminal 18 always projects from the cap 17 by the coil spring 45. Connector plug 10 thus incorporated
The contact 13 is set such that the distance d between the spherical portions 35 is slightly larger than the inner diameter of the connector socket 24, which is the largest.

In the above-described configuration, when the contact portion 13 is inserted into the large-diameter connector socket 24, the spherical portion 35 of the contact 13 is slightly smaller than the inner diameter of the small-diameter connector socket 24 or is curved to be approximately the same. ,
The connector is inserted and removed while smoothly contacting the inner wall of the connector socket 24. Also, the connector socket 24
Since the diameter is large, the folded piece 36 comes into contact with the circuit protection wall 50, but does not fall into the contact escape recess 40.

Further, when the contact portion 13 is inserted into the small-diameter connector socket 24, the spherical portion 35 of the contact 13 is slightly smaller than the inner diameter of the small-diameter connector socket 24 as described above, or is curved substantially the same. It is inserted and removed with smooth contact with the inner wall of the 24. Here, since the connector socket 24 has a small diameter, the tip of the contact piece 34 comes into contact with the circuit protection wall 50 and is further pushed in, so that the tip of the contact piece 34 falls down to the contact recess 40. Bend like so.

In the above embodiment, the contact 13 has a base 33 and two contact pieces 3 extending from both sides of the base 33.
4, but is not limited to this, but is not limited to this, and is divided into two in the middle between the base 33 and the horizontal holding piece 38 as shown by the chain line in FIG. The pieces 34 may be separated from each other, and further, the fixing pieces 37 may be provided respectively, and the pieces may be individually fixed to the printed circuit board 27. Also, two contact piece portions 34 extending from both sides.
Are separately provided, one contact piece 34 connected to the lead wire 19 and on the ground side is fixed to the printed circuit board 27, and the other contact piece 34 as a dummy is fixed.
May be mounted in a free state in the same manner as in the conventional method.

[0025]

According to the present invention, the base 33 of the contact 13 is fixed to the printed circuit board 27, the printed circuit board 27 is stored and fixed in the plug housing 11, and
The base 33 of the tact 13 is connected to the base holding groove 4 of the housing 11.
Since the contacts 13 are fitted into the printed circuit board 1, the contacts 13 are merely assembled together with the printed circuit board 27. Therefore, the number of components at the time of assembly is reduced, and the assembling work is simplified. Moreover, the plug 10 is not twisted when being inserted into or removed from the socket 24.

The conductive coil spring 16 for urging the head terminal 18 is also fixed to the printed circuit board 27, and is stored and fixed in the plug housing 11, so that the assembling and the connection with the lead wire 19 are simplified. It has the effect of.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a connector plug according to the present invention, from which an upper housing is removed.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a perspective view showing one embodiment of a contact according to the present invention.

FIG. 4 is an end view taken along line BB in FIG. 1;

FIG. 5 is an end view taken along line EE in FIG. 1;

FIG. 6 is a partially cutaway front view showing a conventional automobile connector plug.

FIG. 7 is a partially cutaway front view showing another conventional example of an automobile connector plug.

[Explanation of symbols]

10 ... Connector plug for automobile, 11 ... Housing, 1
2. Projection window, 13 Contact, 14 Fuse tube holder, 15 Fuse tube, 16 Conductive coil spring,
17 ... Cap, 18 ... Head terminal, 19 ... Lead wire, 20 ... Power cord, 21 ... Protrusion, 22 ... Insertion hole, 23 ... Both sides, 24 ... Connector socket, 25 ...
Insertion end, 26 ... Base end, 27 ... Printed circuit board, 28 ...
Hollow part, 29 ... Circuit element, 30 ... DC-DC converter, 31 ... Transparent plate part, 32 ... Power lamp, 33 ... Base part,
34 ... contact piece part, 35 ... spherical part, 36 ... turned piece part,
37: fixing piece, 38: horizontal holding piece, 39: positioning projection, 40: contact escape recess, 41: base holding groove, 42: mounting table, 43: solder, 44: chip type fuse, 45: coil spring , 46 ... through hole, 47 ... advance / retreat hole,
48: Socket body, 49: Bimetal, 50: Circuit protection wall, 51: Tip.

Claims (4)

(57) [Claims] An automobile cigar comprising a plug housing and a contact made of a leaf spring provided on a plug housing so as to be movable forward and backward.
In the connector plug 10 for a writer, the fixing piece 37 provided on the base 33 of the contact 13 is fixed to the printed circuit board 27, and the printed circuit board 27 is stored and fixed in the plug housing 11, and the contact
13 into the base holding groove 41 of the housing 11
A connector plug characterized by being embedded therein. 2. The contact 13 is formed by bending a narrow metal plate having conductivity and elasticity into a substantially U-shape with a base 33 and contact pieces 34 extending from both sides of the base 33. The connector plug according to claim 1, wherein a fixing piece (37) integral with the base (33) is inserted into a through hole of the printed circuit board (27), fixed with solder (43), and connected to a circuit pattern. 3. A cigarette lighter connector plug 10 for an automobile, wherein a head terminal 18 provided on a plug housing 11 to be movable forward and backward is urged by a coil spring 45.
The head terminal 18 of the coil spring 45
The other end opposite to the side that is urging is fixed to the printed circuit board 27, and the coil spring 45 is inserted into the head terminal 18.
A connector plug, wherein the printed board 27 is housed and fixed in the plug housing 11 while being compressed . 4. A head terminal 18 provided in the plug housing 11 so as to be able to advance and retreat, and a contact 13 made of a leaf spring, which is provided in the plug housing 11 so as to advance and retreat.
Plug 1 urged by a coil spring 45
0, the contact 13
The base 33 of the head terminal 18 is fixed.
A connector plug characterized in that one end of a coil spring 45 for urging the printed circuit board is fixed, and the printed board 27 is housed and fixed in the plug housing 11.