JPH03173075A - Receptacle type contact - Google Patents

Abstract

PURPOSE: To provide an electric receptacle which has high contact pressure and whose inserting force is low by arranging a central part whose base part extends in the shaft direction and which is connected to the base part on the front end and the rear end and whose front end part inclines to the free end side of an elastic arm. CONSTITUTION: A fitting front end part 4 contains a base part 10, and has an integral side wall 12 rising from this base part 10. This side wall 12 is bent in the inverse (downward) direction after rising, and forms a curved surface part 14, and this curved surface part 14 forms an elastic arm part 16 proceeding to the base part 10, and the tip of this elastic arm part 16 is again bent upward, and forms an arc-shaped contact part 18. Then, when a tab type contact is inserted into a receptacle type contact 2, a central part 22 is made eccentric downward, and enables the tab type contact to contact with a contact surface 38. As a result, inserting force is reduced since it runs along the surfaces 38 and 40 forming an almost line contact surface. Therefore, a receptacle type contact whose inserting force is extremely low and contact pressure is high, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electrical contacts, and particularly to a receptacle type contact with a low insertion force that mates with a flat mating tab type contact.

[Prior art and its problems]

U.S. Pat. No. 4,448,468 discloses an electrical receptacle that mates with flat tab contacts.

The contact has a base with curled sidewalls extending from the base. At the end of this curled sidewall is a free end. It has a latch tongue that is punched out from the base and includes a boss (protrusion) formed upwardly. The boss is configured to be locked within the through hole of the tab contact. and the base includes an upwardly directed portion on each side of the tongue approaching and spaced from the free end;
Increases the mating contact pressure with tab-type contacts.

The latch tongues are stamped from the base metal and are connected together only at the front fixing section. The rear of the latch member forms an ear with a downwardly bent free end.

Moving this ear unlocks the tab from the receptacle.

Although the above-mentioned receptacle type contact is effective in increasing the mating contact pressure, it has the disadvantage that the insertion force is high due to the sliding friction of the large surface area.

It is therefore an object of the present invention to provide an electrical receptacle with high contact pressure and low insertion force.

Another object of the invention is to improve the wipe action between a receptacle and a mating tab contact.

Yet another object of the invention is to improve the introduction into the receptacle to eliminate collisions during insertion.

[Means to solve problems]

In order to achieve the above object, the receptacle type contact of the present invention is configured to rise from the base and then curl downward toward the base.

This contact is characterized in that the base of the terminal has a punched central part. The central portion extends axially along the base, is integral with the base at the front and rear, and has an upwardly sloped portion at the front.

In a preferred embodiment, the base further has a contact arm stamped therefrom. This contact arm stands to the side of the central part. The arm is angled upwardly and bent near the free end of the contact arm to form a curved contact. The lower side of the contact arm part has a recessed part on the axial center of the curved contact part. This concave portion makes line contact with the inner surface of the curved contact portion. The front end of the contact arm forms an acute angle with respect to the axial center and slopes from front to rear, and the axial distance along the front end of the contact arm is lower than the same axial distance along the central slope. do.

In a further preferred embodiment, the free end of the upper arm is bent back upwardly to form a downwardly facing curved contact. The outer surface of the upper arm has a recess tangential to the upper curved section and makes axial contact with the inner surface of the upper curved section.

Preferably, the beginning of the forward ramp is axially proximate the forward end of the upper arm. Furthermore, the central portion includes a flat portion axially rearward of the forward slope, and returns from the flat portion to the base via a downward slope.

〔Example〕

Hereinafter, preferred embodiments of the receptacle type contact of the present invention will be described in detail with reference to the accompanying drawings.

Reference is first made to FIG. 3, which shows a perspective view of a preferred embodiment of the receptacle-type contact of the present invention. The electrical receptacle or receptacle type contact 2 has a mating front end 4, a crimp portion 6 and a strain relief portion 8. The mating front end 4 includes a base 10 and has an integral sidewall 2 rising from the base 10. After this side wall 12 stands up, it is turned upside down (downward).
The curved surface portion 14 is formed by being bent in the direction shown in FIG. This curved surface part 1
4 forms an elastic arm portion 16 facing the base 10, and the tip of this elastic arm portion 16 is bent upward again to form an arcuate contact portion 18.

As shown in FIG. 7, the receptacle-type contact 2 is stamped from a metal plate including a flat stamped arm 20'. Both arms 20° are located between the central part 22' and the wing part 30. arms 20' and wings 30, respectively.
Note that elongated recesses 34 and 36 are formed by casting of sheet metal and extend axially into the inner surface of the contact terminal.

As best shown in FIG. 6, recess 34 forms an inner surface 38 and recess 36 forms an inner surface 40.

Next, a description will be given with reference to FIG. The receptacle type contact 2 is formed by stamping a metal plate as shown in FIG. 7, and includes a central portion 22 having an upwardly inclined portion 24, a substantially flat portion 26, and a downwardly inclined portion 2B. As best shown in FIGS. 4 and 5, the flat base 10 further includes a contact arm 2 extending upwardly toward the central axis of the contact.
Contains 0. The free end is bent downward to form a rounded portion 23 as shown in cross section in FIG. A recess 34 is formed in the contact arm 20 on the central axis of the bending line between the arm 20 and the free end. This places the protrusion inner surface 38 on the inner surface of the fold line of the contact arm. Similarly, the recess 36 is on the central axis of the tangent to the curved portion 28, locating the protruding surface 40 downwardly (as best shown in FIG. 5). Note that the flat portion 26 of the central portion 22 is slightly higher in the vertical direction in FIG. 4 than the upper contact surface, the protruding surface 38. I want to be

As a result of the above-described design, the receptacle-type contacts of the present invention have low insertion force, high contact pressure, excellent wipe action, and an excellent introduction surface to prevent collisions during insertion. This introduction will be explained with reference to FIG. In the figure, the upwardly inclined portion 24 is indicated by a broken line. Note that the resilient arm portion 16 extends almost to the front of the terminal. That is, it extends very close to the position where the slope of the inclined portion 24 starts. This allows for a large insertion area or target X (
Figure 2) is given.

When the tab portion is aligned between surfaces 24 and 38 and the tab contact is further inserted, the tab contact will align with the ramp portion 2.
4 and comes into contact with the upper contact surface 38. From FIGS. 1, 2, and 7, the shear end surface 32 begins at a root 42 axially rearward of the base 10 or the forward end of the resilient arm 16. The shear edge 32 is also sheared at an acute angle relative to the axial centerline, with the slope of this angle extending from the front of the terminal toward the rear toward the centerline or central portion 22.

Since these shear edges 32 have the angles described above,
To prevent a tab type contact from colliding with a receptacle type contact when inserted. The reason for this is, as best shown in FIG. , so it does not collide with the shear edge 32.

Referring to FIGS. 2 and 5, the length of the central portion 22 is sufficiently longer than the arm 16.20, so that the central portion 22 is flexible and the contact arm 16.20 is relatively tonal. I want to be noticed. Therefore, when the tab-type contact is inserted into the receptacle-type contact 2, the center portion 2
2 is biased downwardly so that the tab-shaped contact contacts the contact surface 38.
make contact with.

As a result, the insertion force can be reduced. This is because the insertion force is along the surface 38,40 forming the line contact surface.

Although the low insertion force receptacle type contact of the present invention has been described above with reference to one preferred embodiment, the present invention should not be limited to this embodiment only, and various modifications and changes can be made without departing from the gist thereof. One thing is clear.

〔Effect of the invention〕

Since the receptacle type contact of the present invention is essentially a line contact, the insertion force is extremely low (and the contact pressure is high. Therefore, the insertion operation with the tab type contact is extremely easy, and reliable electrical contact can be achieved. Furthermore, since a sufficient wiping action can be obtained when both contacts are inserted, the contact resistance is small, and collisions during insertion can be effectively avoided, making it effective for relatively large current capacity contacts that are inserted and removed frequently. .

[Brief explanation of the drawing]

Fig. 1 is a top view of a preferred embodiment of the glue receptacle type contact of the present invention, Fig. 2 is a side view of the receptacle type contact of Fig. 1, and Fig. 3 is a front view of the receptacle type contact of Fig. 1 from an oblique direction. 4 is a front view of the receptacle type contact of FIG. 1, FIG. 5 is a sectional view taken along line 5--5 of FIG. 1, and FIG.
7 shows a bottom view of the stamped metal plate forming the receptacle-type contact of FIG. 1;

Claims (1)

[Claims] (1) In a receptacle-type contact forming curled elastic arms on both sides of a base, the base extends in the axial direction and is connected to the base at front and rear ends, and the front end is inclined toward the free end of the elastic arm. A receptacle-type contact characterized by having a central portion.