JPH1012354A - Wrong connection preventing plug for terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform an inserting work without specifying the inserting direction by specifying the structure of a wrong connection preventing plug which is inserted to a terminal housing chamber from the rear end of a connector housing and engagingly locked thereby to prevent the wrong insertion of a terminal. SOLUTION: A preventing plug is, for example, made as a square pole resin molded product. The plug has a pair of contracted parts 12 reduced in rectangular section which are provided longitudinally or in symmetric positions laid along the inserting longitudinal direction to a connector housing 25; insert parts 16 formed alternately with the contracted parts 12 in three positions of the part other than the contracted parts 12; and locking stepped parts 14 to be engaged with an elastic locking piece 28 within a terminal housing chamber 26 for preventing the slip off of the terminal, which are formed on the circumferential surface of the symmetric positions in the inserting longitudinal direction, so that the degree of freedom in installation is enhanced. Thus, even when the preventing plug 10 is inserted to the terminal housing chamber 25 from any direction of longitudinal and vertical directions, the elastic locking piece 28 is engaged with the locking stepped part 14 of the preventing plug 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug for preventing erroneous connection of a terminal, and more particularly to a plug for preventing erroneous connection of a terminal for preventing the terminal from being mounted in a terminal receiving chamber.

[0002]

2. Description of the Related Art A connector housing has a plurality of terminal receiving chambers into which male terminals or female terminals are inserted and locked. As means for locking the terminal in the terminal receiving chamber, for example, an elastic locking piece (hereinafter referred to as "lance") is provided in the terminal receiving chamber, and the male terminal or the female terminal is inserted into the terminal receiving chamber. Then, by engaging the lance with the locking hole of the terminal, the terminal is locked so that it cannot come out.

[0003] By the way, it is preferable to prepare various connector housings according to the intended use, that is, to prepare a connector having a different number of accommodating chambers according to the number of connecting poles of the wire harnesses, since this increases costs in terms of management and production. Absent. 2. Description of the Related Art Conventionally, it is often practiced to share one type of connector with versatility. At this time, a so-called "blind plug", which is a plug for preventing incorrect connection, is used to close the terminal housing so that the terminal is not erroneously inserted into an unused unused terminal housing.

[0004] As this misconnection prevention plug, for example, Japanese Utility Model Publication No.
FIG. 7 illustrates a connector that is applied to the “connector” described in Japanese Patent Application Laid-Open No. 5-171987. The connector includes a bottom 51 a in a terminal insertion hole 51 of a connector housing 50.
The blind plug 52 inserted into the terminal insertion hole 51 has a lance 52 engaged with the step portion 51b.
b is formed by causing the blind plug 52 to extend rearward and downward from the bottom 52a. By inserting the blind plug 52 into the unused terminal accommodating chamber 51 that is not used, the erroneous mounting of the terminal 53 is prevented, and the versatility of the connector housing 50 can be improved.

[0005]

However, in the connector having the above structure, when the blind plug 52 is inserted into the terminal accommodating chamber 51,
The blind plug 52 must be inserted from the distal end side, and the lance 5
It is necessary to insert with 2b facing down. That is, the blind plug 52
However, since the insertion direction and posture were specified when inserting the terminal into the terminal accommodating chamber 51, there was a problem that the insertion work was troublesome and time-consuming because it was necessary to check the direction and insert. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a plug for preventing erroneous coupling of a terminal, which does not require much time for insertion work, to improve workability, and to shorten assembly time. .

[0006]

According to the present invention, there is provided a plug for preventing incorrect connection of a terminal according to the present invention, which is inserted and locked into a terminal receiving chamber from a rear end of a connector housing to prevent incorrect insertion of a terminal. In the plug for preventing incorrect connection of the terminal, a locking step is formed on each peripheral surface at a symmetrical position in the front and rear direction of insertion to form a locking step for engaging the elastic locking piece in the terminal accommodating chamber for retaining the terminal. It is characterized by having.

[0007] Alternatively, at least a cross section intersecting with the insertion direction is provided in an arbitrary shape for preventing insertion of the terminal into the terminal accommodating chamber, and a peripheral surface excluding the locking step is formed in a part corresponding to an inner wall surface of the terminal accommodating chamber. It may be one that is characterized in that it comes into direct contact.

According to the present invention, the plug for preventing incorrect connection of the terminal has an engaging step formed on each peripheral surface at a position symmetrical in the front-rear direction of insertion. Thus, even if the mis-connection preventing plug is inserted into the terminal receiving chamber from either the front-rear direction or the vertical direction, the elastic locking piece in the terminal receiving chamber engages with the engaging step of the incorrect-connection preventing plug. Therefore, the misconnection prevention plug can be inserted without paying attention to the insertion direction.

Further, the mis-coupling prevention plug does not necessarily coincide with the terminal receiving chamber as long as its cross section intersecting the direction of insertion into the terminal receiving chamber has at least a shape for preventing the terminal from being inserted into the terminal receiving chamber. It can be applied even if it does not have the specified cross-sectional shape. That is, for example, an erroneous connection preventing plug having a rectangular cross section can be applied to a round terminal receiving chamber.

Further, if the peripheral surface excluding the locking step portion is partially in contact with the inner wall surface of the terminal accommodating chamber, the insertion resistance at the time of insertion into the terminal accommodating chamber is reduced and the mounting workability is improved. And rattling in the mounted state can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the plug for preventing incorrect connection of terminals according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a plug for preventing connection of a terminal according to the present invention, FIG. 2 is a front view of the plug for preventing wrong connection of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. FIG. The terminal mis-connection prevention plug 10 according to the present invention is provided as a rectangular column-shaped resin molded product, and a pair of rectangular cross-sections are reduced at target positions along the longitudinal direction, that is, the longitudinal direction of insertion into a connector housing described later. Has a constricted portion 12. At other portions except the constricted portion 12, three insertion portions 16 are formed alternately with the constricted portion 12.

As shown in FIG. 5, the connector housing 25 has a rectangular parallelepiped shape in which a terminal accommodating chamber 26 is formed. The terminal accommodating chamber 26 originally has a large insertion opening 26b formed at the rear of the housing for inserting a terminal, and a terminal insertion hole 26c for inserting a terminal of a mating connector is provided at the front of the housing. Although not shown, a plurality of terminal accommodation chambers are formed. An elastic locking piece (lance) 2 for locking the terminal to the ceiling surface in the present embodiment is partially provided on the inner wall surface 26a of the connector housing 25.
8 protrude into the terminal accommodating chamber 26.

As shown in FIG. 4, the constricted portion 12 is formed in a rectangular shape having a width w which is smaller than one side of the prism and has a horizontal cross section which intersects the front-rear direction of insertion.
X) and left and right (with respect to the axis Y-Y). The constricted portion 12 forms a space for engaging the lance 28 with the insertion portions 16 located on both sides, and a locking step portion 14 with which the lance 28 is engaged is formed at an outer end thereof. The locking step 14 is formed evenly on the entire peripheral surface of the prism and enables the lance 28 to be engaged on any surface.

The insertion portion 16 is formed in a square shape with one side of a prism having a length W, and the outer peripheral surface 16 a is formed in a connector housing 25.
It is formed so as to be able to contact the inner wall surface 26a of the terminal accommodating chamber 26 (see FIG. 5). The cross section of the terminal chamber 26 is also square. Insertion part 16 located in the front-back direction of insertion
Is formed with a chamfered tapered surface 16c.

A corner 1 along the front-back direction of insertion of the insertion portion 16
6b is formed with a concave portion 18 having a concave central portion except for both ends. That is, as shown in FIG. 3, the concave portions 18 are formed at 90 ° intervals in a form in which the corners 16 b of the insertion portion 16 are omitted at the center portion, and the erroneous coupling prevention plug 10 is removed from any direction. However, when it is inserted into the terminal accommodating chamber 26, the sliding portion with the inner wall surface 26a of the terminal accommodating chamber 26 is reduced. As a result, the incorrect coupling prevention plug 10 can always be inserted with a small insertion resistance, and the insertion portion 16 excluding the concave portion 18 can be inserted.
As a result, no rattling occurs in the terminal accommodating chamber 26. The shape of the recess 18 for reducing the insertion resistance is as follows.
The present invention is not limited to the rectangular shape but can be set arbitrarily.
Further, the formation position and the number can be appropriately set, but it is premised that rattling does not occur.

The misconnection prevention plug 10 is formed as described above, and the cross section of the constricted portion 12 and the insertion portion 16 is vertically (as shown in FIG. 3 and FIG. 4) with respect to the axis XX. ) And left and right (with respect to the axis Y-Y), and symmetrically in the front-rear direction of insertion.

Next, the operation of the terminal having the above-described structure will be described with reference to FIGS. First, the insertion portion 16 at an arbitrary one end of the incorrect coupling prevention plug 10 is opposed to the insertion port 26b of the predetermined terminal accommodating chamber 26. In this state, the incorrect connection prevention plug 10 is inserted into the terminal accommodating chamber 26.

At this time, the tapered surface 1 is
6c, the plug 10 for preventing incorrect connection can be easily inserted into the terminal accommodating chamber 26. Further, since the concave portion 18 is formed around the insertion portion 16, the insertion resistance with the inner wall surface 26a of the terminal accommodating chamber 26 is reduced, and the insertion can be performed with a small insertion force.

When the mis-connection prevention plug 10 is inserted sufficiently deep into the terminal accommodating chamber 26, as shown in FIG.
The tip of the wrong coupling prevention plug 10 abuts against a stopper wall 26d of the terminal accommodating chamber 26 in which the terminal insertion hole 26c is formed. At this time, the lance 28 enters the constricted portion 12 and engages with the locking step portion 14 to regulate the position of the erroneous coupling prevention plug 10 in the terminal accommodating chamber 26. As described above, by mounting the incorrect coupling prevention plug 10 in the terminal accommodating chamber 26, the terminal is connected to the terminal accommodating chamber 2.
6 is prevented.

By the way, as described above, the erroneous connection preventing plug 10 of the terminal is symmetrical in any of the insertion front-rear direction, the vertical direction, and the rollover direction rotated by 90 ° about the axis. Therefore, the terminal can be inserted into the terminal accommodating chamber 26 without specifying the insertion direction, and the degree of freedom in mounting can be increased.

In the above-described embodiment, the erroneous connection preventing plug 10 is used.
Has a configuration in which a cross section that intersects with the insertion direction is provided in a square shape that matches the terminal accommodating chamber 26. However, the cross section may be provided in any shape as long as it is at least large enough to prevent terminal insertion. Can be. For example, a terminal having a rectangular cross section, an ellipse, a circle, or the like can be applied to the terminal receiving chamber 26 having the above-described shape. In addition, the erroneous connection preventing plug 10 having a square cross section can be applied to a terminal receiving chamber such as a rectangle, an ellipse, and a circle. At this time, the erroneous coupling prevention plug can be formed in a loosely fitted state to the extent that no rattling occurs in the terminal accommodating chamber. Thereby, the versatility of the incorrect coupling prevention plug can be improved.

[0022]

As described above, according to the plug for preventing erroneous connection of the terminal according to the present invention, the insertion direction is not specified in any direction. Becomes easier. Further, the misconnection prevention plug can be selected to have an arbitrary shape as long as at least the cross section intersecting the insertion direction is a shape that prevents the terminal from being inserted into the terminal accommodating chamber. In other words, the erroneous-coupling prevention plug can be applied to a terminal accommodating chamber where the cross-sections do not match, and versatility is obtained. In addition, since the insertion portion has a concave portion and is partially in contact with the inner wall surface of the terminal accommodating chamber, insertion resistance can be reduced and insertion can be performed with low insertion force. Can be. In addition, since the insertion portion except for the locking step portion partially contacts the inner wall surface of the terminal accommodating chamber, it is possible to prevent rattling of the erroneous coupling prevention plug.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of a terminal mis-connection prevention plug according to the present invention.

FIG. 2 is a front view of the misconnection prevention plug of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a view for explaining the operation of a wrong coupling prevention plug.

FIG. 6 is a view for explaining the operation of the wrong coupling prevention plug.

FIG. 7 is a view illustrating a conventional blind plug.

[Description of Signs] 10 Plug for preventing incorrect connection of terminal 12 Constricted portion 14 Locking step 16 Insertion portion 18 Recess 25 Connector housing 25 Connector housing 26 Terminal housing chamber 28 Lance (elastic locking piece)

Claims (2)

[Claims] 1. An erroneous connection preventing plug for inserting and locking a terminal from the rear end of a connector housing into a terminal accommodating chamber to prevent erroneous insertion of a terminal. An erroneous connection prevention plug for a terminal, wherein a locking step to be engaged is formed on each peripheral surface at a position symmetrical in the front-rear direction of insertion to increase the degree of freedom in mounting. 2. A terminal device according to claim 1, wherein at least a cross section intersecting the insertion direction is provided in an arbitrary shape for preventing insertion of the terminal into the terminal receiving chamber, and a peripheral surface excluding the locking step portion is formed on an inner wall surface of the terminal receiving chamber. The plug for preventing incorrect connection of a terminal according to claim 1, wherein the stopper partially contacts.