JP3002995U - Small plug - Google Patents

Abstract

(57) [Abstract] [Purpose] Makes the jack insertion smooth and normal, eliminates the deformation and damage of the opposing spring piece of the center electrode due to the jack collision, and ensures a reliable and stable three-point contact to ensure electrical reliability. Provide a compact plug with high performance. [Structure] Opposing spring pieces 9, 9'provided on an upper base portion 8 of a center electrode 4 fitted in a cylindrical hole are bent at a position outside the hole of a plug hole 1, and the spring pieces 9, 9'and The contact dowels 10, 10 ', 11 are provided at the triangular points with the base 8 at short distances on both spring parts and on the base 8 side in a vertically long manner at a height such that the contact dowels 10, 10', 11 are projecting inside the plug hole 1. Smooth, safe and collision-free insertion of the spring pieces 9 and 9 ', the deformation and damage of the spring portion is eliminated, and reliable and stable three-point contact is secured by installing triangular points of long and short dowels.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small plug used for a jack or the like.

[0002]

[Prior art]

 As shown in FIGS. 5 and 6 (enlarged views) of the accompanying drawings, a conventional small plug is a resin cylinder body in which a plug hole 1 and a step hole 2 having a wide rear opening are communicated with each other and a sleeve portion S is attached to the outer periphery. A flat centered center electrode 4 to be brought into contact with and separated from an electrode pin (not shown) of an insertion jack from the plug hole 1 is inserted into the stepped hole 2 of the plug hole 1. The fitting of the cock-like lid 5 is fixed to the rear opening of the hole 2. That is, the electrode lower part is held by the cock part of the lid body 5, the terminal part 7 under the electrode 4 is fitted through the slit 6 provided on the lid plate part, and the upper step surface and the inner surface of the lid plate part are inserted. The upper and lower edges of the electrodes are clamped so that they are fixedly fitted (see FIG. 6).

Further, the conventional center electrode 4 is merely formed by bending the facing spring pieces 9 and 9 ′ from the upper base portion 8 inward so as to move in the hole, and also the spring pieces. As a design for directly contacting the electrode pins of the jack 9 and 9 ', the spring pieces 9 and 9'are bent so as to face each other in the position of the plug hole 1 (see FIG. 5). Has the following decisive drawbacks.

(1) Insertion from the plug hole 1 The jack is in a collision state at right angles to the sides of the flat spring plates 9 and 9'opposed to the flat plate in the plug hole 1, so that the jack can be smoothly inserted. Disturbed. (2) If the position of the center electrode 4 is slightly displaced from the center of the plug hole 1 or the spring pieces 9 and 9'are deformed even slightly, the collision of the jack will be severe, and forcible insertion will cause the spring piece to be damaged. It easily causes kinking, deformation and damage of 9 and 9 ', resulting in unusable failure in a short time. (3) In order to maintain a good contact state between the jack and the electrode 4, a sufficient contact pressure of the spring pieces 9 and 9'is necessary, so that it is considerably inward from the plug hole 1 toward the center. It is desirable to position the spring pieces 9 and 9'on the above, but if this is done, the jack collision will be worse and the spring deformation and damage due to it will be easier. It is extremely difficult to design a bend that ensures a high contact pressure. (4) To install only the spring pieces 9 and 9'in the position inside the plug hole 1, two-point contact of only the spring part with the jack or spring contact pressure from the opposite side due to looseness of the jack When the electrode pin is pushed toward the upper base 8 side and tilted, the pin head comes into contact with the surface of the base 8 and three-point contact is obtained, but the looseness of the jack is not normal and There is contact instability, which correlates with the high frequency of defective products.

[0005]

[Problems to be solved by the device]

 The present invention surely eliminates the above-mentioned drawbacks of the conventional product, and ensures a stable and stable three-point contact with the center electrode under the smooth and safe insertion of the jack into the plug hole, thus ensuring electrical reliability. The purpose is to provide a small plug that is stable and has long-term stable use.

[0006]

[Means for Solving the Problems]

 The opposing spring piece provided on the upper base of the center electrode for flat plate processing that fits into the wide stepped hole that communicates with the plug hole of the resin cylinder of the small plug is bent and formed so that it is located outside the hole of the plug hole. In addition, at the height where it projects into the position of the inside of the plug hole with respect to the triangular points between both tip parts of the spring piece and the center part of the base part, the contact pieces that are opposed to each other on the side of the spring piece are short. In addition, a contact tab, which is long in the vertical direction toward the lower terminal portion, is provided on the base side so as to project inwardly so as to make three-point contact with the electrode pin.

[0007]

[Action]

 The opposite electrode spring piece of the center electrode bent outside the plug hole does not come into direct contact with the electrode pin of the jack, and the height that protrudes into the plug hole at the triangular point between the spring piece and the upper base. The electrode pins will hit the long and short contact dowels that are provided on the shaft, and the pins will slide along the slopes of the dowels to push out the spring pieces, allowing smooth jack insertion under the spring motion. And a reliable three-point contact state occurs. In this three-point contact state, the electrode pin that has received the contact pressure of the short dowel on the spring piece side is in contact with the long dowel on the upper base side in the long pin range, so the insertion jack is straight and does not tilt. The insertion will be normal and the contact will be reliable.

If the dowel on the base side is a short dowel as on the spring piece side, the electrode pin pressed from the spring piece side will have a short tab on the base side as if it were a lever, and the pin will be attached to the pin. Although there is instability that causes lever movement and tilt, the vertically long dowel keeps the pin in contact over a long range, so the pin tilt is completely prevented and the above instability is eliminated. That is, the normal straight jack insertion without inclination is achieved.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 (enlarged views) of the accompanying drawings. The lower portion is the terminal portion 7 and the upper portion is the stepped hole 2 in the stepped hole 2 of the resin cylindrical body 3 having the plug hole 1 and the stepped hole 2 having a wide rear opening communicated with each other and the sleeve portion S attached to the outer periphery. A central electrode 4 for flat plate processing, which is formed by bending and forming opposed spring pieces 9 and 9'which are spring-moved inside, and a cock shape in which a slit 6 for inserting a terminal portion 7 of the electrode 4 into a lid plate portion is provided. Holding the lid against the rear opening of the step hole 2 of the lid 5, holding the electrode lower part at the cock part, fitting the terminal part 7 through the slit 6, and the upper and lower edges of the electrode on the upper step surface and the lid plate inner surface. In a small plug that is fixedly fitted by holding the opposite electrode springs 9 and 9'of the center electrode 4 in such a manner as to fit along the plug hole 1 at a position outside the hole (see FIG. 1). At the same time, the triangular points between the tips of the spring pieces 9 and 9'and the center of the upper base 8 (see FIG. 3). In contrast, at the height of the protrusion at the inner position of the plug hole 1, a short contact dowel 10, 10 'is provided on the spring piece 9, 9'side and a terminal is provided on the upper base 8 side. A configuration in which a contact dowel 11 which is considerably long in the vertical direction toward the portion 7 (see FIG. 4) is provided so as to project inwardly so as to make three-point contact with the electrode pin of the insertion jack from the plug hole 1 (see FIG. 4). A small plug characterized by (See Figures 1 and 2). The long and short contact dowels 10, 10 ′ and 11 of the center electrode 4 may be replaced by a cut-and-raised piece having a lower opening.

Since the present invention has the above-mentioned structure, the opposing spring pieces 9 and 9 ′ of the center electrode 4 fitted in the stepped hole 2 in the cylinder are bent outside the plug hole 1. , The electrode pin of the insertion jack has no direct collision with the spring pieces 9 and 9 ', and the long and short contact dowels 10 and 10' at the triangular points provided in the projecting position in the plug hole 1 , 11 and the pins slide along the slopes of the dowels 10, 10 ′, 11 so that the spring pieces 9, 9 ′ are pushed and spread smoothly, and the jacks move under the spring movement. The insertion operation is performed smoothly and a reliable three-point contact state is achieved.

In this three-point contact state, the contact dowel 11 on the center side of the base 8 is formed to be considerably longer than the short contact dowels 10 and 10 ′ on the spring side. The electrode pin that receives contact pressure from two opposing points contacts the long dowel for a long pin range, so the pin inclination is blocked and the insertion jack is straight and has no inclination. , 3 point contact is sure. This is because the three dowels are long and short, and the upper base 8 side is a long dowel. If the three-point dowel is the same short dowel, the electrode pin pushed from the spring side will be like a lever fulcrum even if the short dowel on the base side is the same, causing a lever movement to the pin and causing no tilt. Causes normal instability.

[0012]

[Effect of device]

 From the above, the present invention is as follows. Since the flat plate opposite spring pieces 9 and 9'of the center electrode 4 do not appear in the plug hole 1, the insertion jack does not collide with the spring pieces 9 and 9'as in the conventional case. There is no deformation, damage, or failure of the springs 9 and 9 ', and a really smooth and safe jack insertion operation can be performed. 2. The contact pressure of the electrode pin against the dowel at the triangular point ensures a reliable and stable three-point contact, increasing the electrical reliability. 3. Since the opposing spring pieces 9 and 9'are located outside the plug hole 1 and the dowels at the triangular points are projected into the plug hole 1, even if the center electrode 4 is slightly displaced from the center of the plug hole 1, Since there is no obstacle to jack impact on the spring pieces 9 and 9'and a sufficient contact pressure can be secured with the dowel protruding in the hole, the spring bending design is easy, and the center electrode 4 is easy to manufacture and install. Therefore, the manufacturing of small plugs can be simplified. 4. By providing the contact dowel 11 on the upper base 8 side of the center electrode 4 to be considerably longer than the contact dowels 10 and 10 ′ of the spring part, the tilt insertion of the jack can be regulated and straight normal insertion can be ensured. A small plug that ensures stable long-term usability is provided in correlation with the three-point contact for stable contact pressure. There is an effect.

[Brief description of drawings]

[Figure 1] Enlarged front view of the product

FIG. 2 is a sectional view taken along the line AB of FIG.

FIG. 3 is a cross-sectional view of the front of the product of the present invention taken along the line C-D in FIG.

FIG. 4 is an enlarged center electrode diagram used in the present invention.

FIG. 5 is an enlarged front view of a conventional product.

6 is a sectional view taken along the line EF of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug hole 2 Step hole 3 Resin cylinder 4 Center electrode 7 Terminal part 8 Upper base 9,9 'Opposing spring piece 10,10' Short contact dowel 11 Vertical contact dowel

Claims (1)

[Scope of utility model registration request] 1. A pair of opposing spring pieces 9, 9 having a lower portion as a terminal portion 7 and an upper base portion 8 which is spring-moved in the hole with respect to the inside of the step hole 2 of a resin cylindrical body 3 which connects the plug hole 1 and the step hole 2 to each other. In a small plug in which the center electrode 4 having a curved shape is fitted and fixed by the cover of the cock-shaped lid body 5, the opposing spring pieces 9 of the center electrode 4 are
9'is bent in a position outside the hole of the plug hole 1, and the inner position of the plug hole 1 is set to the triangular points between the tip ends of the spring pieces 9 and 9'and the center part of the base 8. At a certain height, a short contact dowel 10,1 is provided on the spring piece 9,9 'side.
0 ', and a vertically elongated contact dowel 11 toward the terminal portion 7 on the side of the base portion 8 is convexly provided inward so as to make three-point contact with the electrode pin of the insertion jack. A small plug that does.