JPH0241825Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention is applicable to various OA equipment, FA equipment,
The present invention relates to the structure of a contact lance that is particularly effective as a contact for an electrical connector that is often used for internal wiring of electronic devices such as measuring instruments and connections between devices.

2. Description of the Related Art Electrical connectors used for the internal wiring of electronic devices or connections between devices are, for example, as shown in FIG. The contact 3 is connected and the contact 3 is connected to the connector housing 4.
They are designed to be inserted and housed in parallel.

Problems to be Solved by the Invention Incidentally, in order to prevent each contact 3 fitted into the connector housing 4 from accidentally coming out, the contact 3 usually has a lance (a lance) integrally stamped and bent from the bottom plate. (not shown) is provided. However, since each electric wire 2 is very thin, the contact 3 connected to it must also be made of a thin plate and small in size. Therefore, the holding force of the contact 3 to the housing 4 by the lance is weak, and buckling occurs at the root. There was a problem that it was easy to cause

The present invention was developed with the aim of solving the above-mentioned problems, and although it is made of a thin plate and is compact, the holding force of the contact against the housing by the lance is large and stable, and it is easy to insert. The purpose is to provide a contact with low resistance.

Means for Solving the Problems That is, the present invention has a U-shaped cross-sectional body with opposing side plates erected on both sides of the bottom plate, and a fitting connection part is connected to one end of the body, and a wire connection part is connected to the other end. The contact is provided with locking lugs protruding from both sides of a free end of a lance formed by punching and bending from the bottom plate between the both side plates, and the locking lugs protrude from both sides of the lance. The present invention relates to a contact of an electrical connector in which the lance is loosely engaged with a window hole opened between the two, so that the lance can be bent within a certain range regulated by the window hole.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Figures 1 and 2 show contact 1 according to the present invention.
0, and the whole is made by punching and bending a single thin conductive metal plate (for example, 0.2 mm thick). The contact body 11 has a bottom plate 12
It has a U-shaped cross section with a pair of opposing side plates 13, 13 erected on both sides, and a pin-shaped fitting connection part 14 is connected to one end, and the electric wire 2 of the multicore cable 1 is connected to the other end. A mouth ring part 15 that is crimped and connected to the core wire 2a and a mouth ring part 16 that is crimped and connected to the covering part 2b are arranged in series (see FIG. 4).

Reference numeral 17 is a lance formed by punching and bending from the bottom plate 12, and a root portion 17a is connected to the bottom plate 12, and extends obliquely upward between the both side plates 13, 13, and a free end portion 17b is formed. It has a slightly bent cantilevered structure, and locking ears 18, 18 are protruded from both sides of the free end portion 17b.

As clearly shown in FIGS. 1 and 3, the locking tabs 18, 18 are loosely engaged with window holes 19, 19 opened in the side plates 13, 13,
As a result, the lance 17 can be bent within a certain range regulated by the window holes 19, 19, as shown by the imaginary line in FIG.

FIG. 4 shows the use state of the contact 10 having the above-mentioned structure, and 20 is an insulating housing molded from an insulating plastic material such as nylon, and receiving chambers 21 for accommodating the contacts 10 individually and spaced apart are arranged in parallel. There are many. Each of the receiving chambers 21 is formed in a penetrating state with openings 22 and 23 at both front and rear ends, and a locking protrusion 24 is provided at approximately the center top portion of the inside. A locking shoulder 25 is formed on the front end surface of the locking protrusion 24, and an inclined guide wall surface 26 is formed on the rear end opening 23 side. In the figure, 27 is a cover casing.

The contact 10 connected to the tip of the electric wire 2 is
The lance 17 is inserted into the receiving chamber 21 through the rear end opening 23, and during the insertion, the lance 17 comes into contact with the inclined guide wall surface 26 and becomes bent as shown by the imaginary line in FIG. When the lance 17 is inserted to a predetermined position protruding from the rear end opening 22, the lance 17 returns to the position shown by the solid line due to its elastic restoring force, its tip is locked to the locking shoulder 25, and the contact 10 comes out of the rear end opening 23. to prevent Note that the contact 10 inserted into the predetermined position shown in FIG.
The front edges 13a, 13a of the side plates 13, 13 are connected to the locking shoulders 18, 28 provided on the insulating housing 20.
, and is prevented from coming out of the front end opening 22.

When inserting the contact 10 into the insulating housing 20 described above, the lance 17 punched out from the bottom plate 12 extends obliquely upward on both side plates 13, 13, so that it is easily bent and positioned at the position shown by the imaginary line in FIG. easily succumb to. Therefore,
The insertion resistance is very low, and the contact 10 can be inserted to a predetermined position with a light insertion force. On the other hand, after the contact 10 has been inserted into the predetermined position shown in FIG. 25 to prevent this, but in this case, the locking ears 18, 18 on both sides
are pressed and held against the side edges 19a and upper edges 19b of both window holes 19, 19, and thereby the contact 10
A large holding force is obtained to prevent the lance from coming off, and an excessive load is not applied to the root part 17a of the lance 17. Therefore, buckling of the lance 17 at the root portion 17a can be effectively prevented.

Effects of the invention As explained above, according to the invention, locking ears are provided protruding from both sides of the free end of the lance formed by punching and bending from the bottom plate of the contact body between both side plates. The lug pieces are loosely engaged with the window holes opened in the side plates, and the lance can be bent within a certain range regulated by the window holes, so that the contact with respect to the insulating housing can be bent. The holding force is large and stable, and sufficient holding force can be obtained even if the contact is made of a thin plate and small in size. Moreover, since the lance extends upward from the bottom plate, it is easily flexible and has very low insertion resistance. This is advantageous for electrical connectors for multi-conductor cables, which require contacts to be connected to a large number of wire ends and inserted into an insulating housing; Ideal as a contact for cable electrical connectors, such as D-sub connectors.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the contact according to the present invention, Fig. 2 is a partially cutaway side view of the contact, and Fig. 3 is the same as shown in Fig. 1.
FIG. 4 is an enlarged cross-sectional view taken along line -3, FIG. 4 is a longitudinal sectional front view of the main part showing the state of use, and FIG. 5 is a perspective view showing a conventional example. 10... Contact, 11... Contact body, 12... Bottom plate, 13... Side plate, 14... Fitting connection part, 15, 16... Crimp ring part, 17... Lance, 18... Locking ear Piece, 19...Window hole, 20...
…Insulated housing.

Claims (1)

[Scope of Claim for Utility Model Registration] A contact having a U-shaped cross-sectional body with opposing side plates upright on both sides of the bottom plate, in which a fitting connection part is connected to one end of the body, and a wire connection part is connected to the other end. A locking lug protrudes from both sides of the free end of the lance formed by punching and bending from the bottom plate between the both side plates, and the locking lug has a window hole opened between the both side plates. A contact of an electrical connector, wherein the lance is loosely engaged with the lance so that the lance can be bent within a certain range regulated by the window hole.