JPH0214149Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a compact jack that can be constructed in a compact size and takes into consideration the retention of an inserted plug.

``Prior Art'' In conventional small jacks, the inserted plug is held by engagement with a contact piece or engagement between the contact piece and the body. Therefore, for example, even if the plug is inserted into the body with the contact piece removed from the body, the plug will not be held by the body, and if the plug is placed on the lower side, the plug will fall from the body. As described above, in conventional jacks, the inserted plug is primarily held by the contact piece. As the jack becomes smaller, the thickness of the contact piece becomes thinner and the width of the contact piece also becomes smaller, so the force that holds the inserted plug through engagement with the contact piece becomes weaker, making it easier to insert the plug. There was a risk that it would slip out. This made it difficult to downsize the jack. Furthermore, since there is play between the plug and the jack when the plug is inserted, if the direction of insertion of the plug is oblique during insertion, there is a risk that the contact piece will be greatly displaced and permanently deformed.

The object of this invention is to provide a compact jack which can be made extremely small, can hold a plug sufficiently, and is strong against prying.

``Means for Solving the Problems'' According to this invention, a protrusion that engages with the tip of the plug and holds the plug in the body when the plug is inserted is formed integrally with the body. The contact piece is held on the body by inserting both side edges of the contact piece into holding grooves formed opposite to the opposing inner surfaces of the body, and the convex portion is formed on at least one of the opposing inner surfaces of the body. Moreover, the portion where the convex portion is formed can be partially displaced in the direction perpendicular to the plate surface of the body, and the partial displacement does not affect the holding of the contact piece. The portion that can be displaced is limited to a certain extent. For example, only that part can be made thin, or a slit can be formed to allow partial displacement. In this way, in this invention, the inserted plug is held by the body, so the holding force can be strengthened.
Further, by selecting the shape of the convex portion, it is possible to make it difficult for the plug to be strained when inserting the plug.

``Example'' An example of a small jack according to this invention will be described with reference to the drawings. As shown in FIG. 1, the body 11 of the jack according to this invention has a substantially rectangular parallelepiped shape, and a sleeve 13 is integrally formed in the center of a front plate 12, projecting forward and into which a plug is inserted. That is, a plug insertion hole 14 is formed in the front plate 12 so as to communicate with the sleeve 13. Furthermore, the body 11 has a top plate 15 and a bottom plate 16 opposite thereto.
The left and right side plates 17 and 18 are integrally formed with the front plate 12 as a molded product of synthetic resin. The interval between the top plate 15 and the bottom plate 16 is narrow;
There is a narrow distance between the inner surfaces, which is approximately equal to the outer circumferential diameter of the plug inserted through the sleeve 13. The distance between the left and right side plates 17 and 18 is larger than this, and the contact pieces are held on both left and right sides of the inserted plug.

As shown in FIG. 2, in this example, the contact piece 2 is bent into a substantially V-shape close to the left side plate 17.
1 is housed in the body 11 with one half thereof facing the side plate 17, and a fixed contact piece 22 is provided relatively close to and facing the side plate 17.
In addition, the free end portion of the movable contact piece 21 is elastically pressed against the side plate 17 side. On the other hand, on the right side plate 18 side, the movable contact piece 2 is similarly bent into a substantially V-shape.
3 is housed in the body 11 with one half thereof facing the side plate 18, and a fixed contact piece 24 is held on the body 11 relatively closely facing the side plate 18. The half portion is in elastic contact with the fixed contact piece 24 on the right side plate 18 side.

The V-shaped bent part of the movable contact piece 21 is located on the front plate 12 side, and the middle part of the other half that does not contact the side plate 17 protrudes toward the side plate 18 so as to make contact with the inserted plug. The plug contact portion 21a is located close to an extension of the axis of the sleeve 13. On the other hand, the V-shaped bent part of the movable contact piece 23 is located on the front plate 12 side, and the free end of the half opposite to the side plate 18 extends near the center so as to come into contact with the inserted plug. This is used as a plug contact portion 23a. Plug contact part 21
a is located on the front side with respect to the plug contact portion 23a. FIG. 6 shows a perspective view of the contact pieces 21, 22, 23, and 24.

These contact pieces 21 to 24 are held between the top plate 15 and the bottom plate 16 at their side edges. That is, as shown in FIGS. 1 and 4, holding grooves 25a and 25b are formed in the top plate 15 and bottom plate 16 in contact with the left side plate 17 and extending in the front and back direction, respectively.
5a and 25b, both side edges of one half of the movable contact piece 21 are press-fitted from the rear side toward the front. Further, corresponding to the fixed contact piece 22, holding grooves 26a and 2
6b are respectively formed, and the upper and lower side edges of the fixed contact piece 22 are inserted into the holding grooves 26a and 26b from the rear and held. Similarly, the left side plate 18
Holding grooves 28a and 28b are formed in the top plate 15 and the bottom plate 16 along the front-rear direction, respectively, in contact with the holding grooves 28a and 28b.
One half of the is inserted and held by its upper and lower side edges from the rear. Furthermore, holding grooves 29a and 29b are formed in the top plate 15 and the bottom plate 16, respectively, corresponding to the fixed contact piece 24, and the upper and lower edges of the fixed contact piece 24 are inserted and held therein, respectively.

Each holding groove 25b, 26b, 28 on the bottom plate 16 side
b, 29b each have a kerf at the rear end,
Terminals 31 to 33 are integrally formed on the contact pieces 21 to 24, respectively, extending downward at right angles to the front-back direction.
b, 28b, 29b are inserted into the grooves of bottom plate 1.
6, and these ends are positioned by pressing against the front ends of the corresponding kerfs. As shown in FIG. 2, the free end of the movable contact piece 21 is the contact part 21b for the fixed contact piece 22, and the intermediate part between the free end and the bent part of the movable contact piece 23 is the fixed contact part. 24 is a contact portion 23b.

In this example, the sleeve 13 into which the plug is inserted also has a convex portion 43 integrally formed on one of the arc-shaped convex portions 46, which engages with the tip portion 42 of the inserted plug. This convex portion 43 extends in the left-right direction.

In the portion where the convex portion 43 is formed, the plate portion of the body 11 can be partially displaced in a direction perpendicular to the plate surface, in this example, the top plate, to the extent that it does not affect the holding of the contact piece. . Therefore, in this example, as shown in FIGS. 1, 3, and 4, the outer surface of the top plate 15 is shaved off at the portion where the convex portion 43 is formed to form a thin portion 48. Further, a cut groove 49 is formed in the thin portion 48 from the rear end thereof, facing the center thereof, that is, the center between the left and right side plates 17 and 18, that is, the insertion axis of the plug. This thin part 48 is located inside the holding grooves 26a, 29a, and therefore, the thin part 48 can be displaced in a direction perpendicular to the plate surface of the top plate 15, but due to this displacement, the holding grooves 26a, 29a are not displaced. be prevented from receiving it. Further, the convex portion 43 is shaped so as to follow the circumferential surface of the tip portion 42 of the inserted plug.

According to the small jack according to the invention described above, when the plug is inserted through the plug insertion sleeve 13, the contact portions 21a and 23a of the movable contact pieces 21 and 23 are brought into contact with each other by the plug, and the movable contact pieces 21 and 23 are displaced toward the side plates 17 and 18, respectively. and fixed contact piece 22,
24 is released and the contact portion 21a
contacts the ring portion of the plug, the contact portion 23a contacts the constricted portion bordering the tip portion, and the earth cylinder elastically contacts the contact portions 35b and 35c of the earth contact piece, respectively.

When the plug is inserted, its tip portion 42 contacts the engagement protrusion 43 and elastically displaces the thin wall portion 48, and then is further inserted, causing the engagement protrusion 43 and the tip portion 4 to
2 are engaged. Therefore, the holding force for the inserted plug is obtained between the engaging convex portion 43 and the tip portion 42 of the body, and there is no need for the holding force for holding the plug by the contact piece 23. In other words, in this jack, even if only the plug is inserted into the body with the contact piece removed from the body, the plug is held in the body 11 by the engagement between the tip portion 42 and the engagement convex portion 43. Therefore, since the holding force of the conventional contact piece is not required, the thickness of the movable contact piece is made thinner.
Moreover, its width, in the vertical direction in the figure, can be made smaller. In this case, a part of the body is displaced in order to sufficiently engage with such a convex portion 43 during insertion, and the displaced portion is a thinned portion 48 in this example and a cut groove 49 is formed. The body is displaced only in a part of the body, and the holding groove holding the contact piece is not affected, and the state of holding the contact piece is maintained stably.

As shown in this example, the engaging convex portion 43 is shaped to fit with the outer peripheral surface of the tip portion 42 of the plug, and in this case, the shape of the arcuate convex portions 46 and 47 also allows the inserted plug to be in an oblique direction. However, there is no risk of the contact pieces being guided by these convex portions and being largely displaced. In this case, the direction in which the contact pieces 21 and 23 are twisted is the left-right direction, and the direction in which the thin wall portion 48 is likely to be displaced is the up-down direction. The thin wall portion 48 is also relatively difficult to displace in the left-right direction, and therefore the inserted plug is difficult to be forced diagonally in the left-right direction. There is no risk of causing permanent deformation due to large deformation of the contact piece, that is, a prying prevention effect can be obtained.

In the above description, the protrusions 43 may be formed on both the top plate 15 and the bottom plate 16. Further, the displaceable portion may be constituted only by the thin wall portion, that is, the cut groove 49 may not be formed, or conversely, the cut groove 49 may be formed alone, or, for example, two portions corresponding to both sides of the thin wall portion may be formed. It is also possible to form only the book kerf and omit the thin wall portion. Such displacement can be achieved by the action of either the kerf or the thinned section, or both. It may also be applied to both sides of the top plate and bottom plate. Furthermore, the number of contact pieces is not limited to the above example. Further, the plug insertion/removal sleeve 13 may be made of a metal material.

``Effects of the invention'' As described above, according to this invention, the engaging protrusion that engages with the inserted plug is formed integrally with the body, and by making that part partially displaceable. The inserted plug can be held, and the holding force is strong, so there is no need to use the contact piece to hold the plug, and the thickness and width of the contact piece can be reduced, making the jack smaller. It can be done. Further, by using the above example, it is possible to make the plug strong against prying when inserting and removing the plug.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a small jack according to this invention, Fig. 2 is a horizontal sectional view thereof, Fig. 3 is a vertical sectional perspective view of the body 11, and Fig. 4 is a perspective view of the body 1.
1, FIG. 5 is a horizontal cross-sectional view of the body 11 viewed from above, and FIG. 6 is a perspective view of the contact piece. 11: Body, 21 to 24: Contact piece, 25a,
25b, 26a, 26b, 28a, 28b, 29
a, 29b: Holding groove, 14: Plug insertion/removal hole, 4
1: Plug, 42: Tip portion, 43: Engagement convex portion,
48: Thin wall portion, 49: Cut groove.

Claims (1)

[Claims for Utility Model Registration] A plug insertion hole is provided on one side of the insulating material body.
Holding grooves extending in the plug insertion/removal direction are formed on a pair of opposing inner surfaces of the body parallel to the insertion/removal direction of the plug inserted through the plug insertion hole, and both side edges of the contact piece are formed between these holding grooves. In a small jack into which a plug is inserted and its contact piece is held by the body, and the contact piece is directly driven by the inserted plug, the convex part that engages with the tip of the inserted plug is held by the body. It is formed integrally with the inner surface where the groove is formed, and the part where the convex portion is formed can be partially displaced in a direction perpendicular to the inner surface of the body within a limited range that does not affect the holding of the contact piece. A small jack characterized by being provided with means for