JPH035099Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a plug, and particularly to a plug connected to a socket.

2. Description of the Related Art A plug generally has a structure in which a contact pin holder that holds a contact pin is surrounded by a metal shell, and a resin cover is provided on the outside of the shell to cover the shell. The relative orientation of the cover in the circumferential direction with respect to the shell is determined to be a predetermined orientation due to the relationship between the fixing structure between the cover and the shell, marks on the outside of the cover, and the like.

Problems to be solved by the invention The cover is attached by fitting around the shell from the rear side of the shell. Conventionally, when the cover can be fitted into the shell, the circumferential direction of the cover with respect to the shell has not been limited to a predetermined direction, and if the direction of the cover with respect to the shell is in a direction other than the above-mentioned predetermined direction. However, the cover could be fitted onto the shell. Therefore, when installing the cover, it is necessary to determine the orientation of the cover, and even if you are careful during the installation process, there is a problem that the cover may be installed in the wrong direction.

The present invention aims to provide a plug that solves the above problems.

Means for Solving the Problems The present invention has a structure in which a contact pin is surrounded by a conductive shell, and an insulating cover is fitted to the shell from the rear side and is attached to cover the shell. Yes, in the plug inserted and connected to the socket, the socket 13 is attached to the front part of the shell 10.
A concave line 12 formed to prevent incorrect insertion into the
is formed to extend along the axis of the shell to the rear end of the shell, and a protrusion 18 corresponding to the groove is provided on the inner surface of the cover 11 and extends in the axial direction of the cover. , the cover 11 engages the protrusion 18 with a portion 12a of the recessed line 12 that is formed by extending to the rear end of the shell 10;
The structure is such that it is fitted and attached to the

Embodiment Next, an embodiment of the plug according to the present invention will be described.

As shown in Figure 1, Figures 2A and B, and Figure 3,
The plug 1 is formed by combining a contact pin holding member 7 that holds a plurality of contact pins 2 to 6 and a pair of metal shell halves 8 and 9, and surrounds the contact pin holding member 7. It consists of a cylindrical metal shell 10 with a square cross section, and an insulating resin cover 11 that covers the shell 10 and has a cylindrical shape with a square cross section. As shown in FIG. 4, this plug 1 is constructed by fitting the groove 12 into the groove 14 of the socket 13 with the groove 12 formed on the shell half 8 facing the groove 14 of the socket 13. It is inserted and connected to the socket 13.

As shown in FIGS. 1 and 3, the cable 15
The end of the cable 15 is caulked and fixed to the rear end of the shell half 8, and an electric wire 16 drawn out from the end of the cable 15 is connected to the rear end of the contact pins 2 to 6. Furthermore, the shell half 8 is connected to a braided shield 17 exposed at the end of the cable 15.

As shown in FIGS. 5 and 6, the groove 12 for preventing incorrect insertion is formed to extend to the rear end of the shell half 8.
a functions to eliminate errors in attaching the cover 11.

As shown in FIGS. 1, 2A, and 3, a protrusion (engaging portion) 18 is formed on one of the four inner walls of the cover 11 and extends in the longitudinal direction. be.

As shown in FIG. 7, the cover 11 is moved in the direction of arrow A and fitted onto the metal shell 10 from the rear end side of the metal shell 10.
Installed as shown in Figure A.

If the circumferential direction of the cover 11 with respect to the metal shell 10 is such that the protrusions 18 are different from the grooves 12, when trying to fit the cover 11 to the metal shell 10, the protrusions may The tip of the cover 18 is locked to the rear end 10a of the metal shell 10, thereby restricting the fitting of the cover 11 into the metal shell 10. This reliably prevents the cover 11 from being attached in the wrong direction.

When the circumferential direction of the cover 11 with respect to the metal shell 10 is such that the protrusions 18 and the grooves 12 coincide with each other, the protrusions 18 fit into the grooves 12 from the rear end side, so that the cover 11 It fits on the outside of the metal shell 10. As shown in FIG. 1, the cover 11 is fitted to a position where the stepped portion at the end of the inner thick portion 21 abuts the rear end 10a of the metal shell 10, and a locking pawl 19 integrally formed on the cover 7 is fitted. is locked by the locking claw 20 of the shell half 9, and the shell 1
Fixed to 0.

That is, the presence of the protrusions 18 and the grooves 12 prevents the cover 11 from being attached to the metal shell 10 in the wrong orientation, and the cover 11 is always attached in the correct orientation.

As shown in FIGS. 5 and 6, the grooves 12 are formed without being separated by the openings 22. As shown in FIGS. Therefore, the bottom surface of the grooved line 12 extends without a step even at the opening 22. Therefore, the protrusions 18 fit into the grooves 12 without being caught in the middle of the grooves 12, and the cover 11 is smoothly attached to the metal shell 10. Note that when the opening 22 crosses the grooved strip 12, the bottom surface of the grooved strip 12 is likely to have a step at the opening 22, and there is also a possibility that burrs may appear.
If the protrusions 18 get caught on these, it may become difficult to attach the cover 11. Also, protrusion 18
The tip is a slope 18a, making it easy to fit into the groove.

Further, the contact pin holding member 7 is also attached with its direction regulated using the above-mentioned grooved line 12 for preventing erroneous insertion. That is, as shown in Figure 2,
The holding member 7 is assembled in such a direction that the wall 23 formed on one surface fits into the grooved strip 12. Further, the holding member 7 is attached so that the plurality of protrusions 27 on the circumferential surface fit into the openings 22 and 25 (see FIG. 1) of the metal shell 10, so that movement in the axial direction is restricted.

Note that by making the grooved line 12 protrude inward from the shell half 8 as shown in FIG. There is no need to make it any thicker than normally required.

Further, in the present invention, the metal shell and cover are not limited to square shapes as described above, but may be circular shapes.

Effects of the invention As described above, the invention of the present application has the following features.

The grooves on the shell and the protrusions on the cover, both of which are formed to extend in the axial direction, restrict the direction of the cover around the axis relative to the shell when attached to the shell to be in the - direction. As a result, the cover is always attached to the shell in a predetermined direction in the circumferential direction, and it is possible to reliably eliminate assembly errors in which the cover is attached in the wrong direction.

The part where the protruding part of the cover fits is an extension of the recessed part previously formed on the shell to prevent incorrect insertion of the plug into the socket. It is easier to form grooves than when forming grooves, and it is advantageous in terms of manufacturing.

When forming a groove on the inner surface of the cover, the thickness of the cover must be adjusted to take into account the depth of the groove, which results in a thicker cover. Since it has a structure with protruding stripes, the thickness of the cover can be made thinner. Therefore, it is possible to avoid increasing the size of the plug.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the plug according to the present invention, Figs. 2A and B are front views of the shell of Fig. 1, and Fig. 3 is a half shell with a contact pin holding member attached. A perspective view showing the cover with the upper side cut out and removed, FIG. 4 is a view showing the plug and socket corresponding to each other, and FIGS. Perspective views of a certain shell half in an upright state and an upside-down state, No. 7
The figure is a diagram illustrating how to attach the cover to the metal shell. 1...Plug, 2-6...Contact pin, 7
. . . Contact pin holding member, 10 . Cable, 18... protrusion, 18a... slope.

Claims (1)

[Claim for Utility Model Registration] It has a structure in which a contact pin is surrounded by a conductive shell, and an insulating cover is fitted to the shell from the rear side to cover the shell, and the contact pin is attached to the socket. In the plug to be inserted and connected, a groove is formed in the front part of the shell to prevent incorrect insertion into the socket, the rear end of the shell is extended along the axis of the shell, and the cover is A protrusion corresponding to the groove is provided on the inner surface of the cover and extends in the axial direction of the cover, and the cover extends the protrusion to a rear end of the shell among the grooves. The plug is configured to be fitted and attached to the shell while being engaged with the formed portion.