JPH06290825A - Contact - Google Patents

Abstract

PURPOSE: To push lead pin into gap between both elastic contact pieces of a contact even by a weak force and hold the lead pin with sufficient force after pushing in. CONSTITUTION: In this contact 10, a lead pin P is to be at first brought into contact with curved line parts 13a of both elastic contact pieces 13, 13 at the upper front ends and the height L from the deformation supporting point 12 to the contact position 13b is made high as compared with a conventional one. Moreover, in the case that pushing force is further applied to the lead pin P, the pushing force applied to the lead pin P is transmitted in the direction in which both elastic contact pieces 13, 13 are forcedly and efficiently spread as the lead pin P is pushed deep between both curved line parts 13a, 13a. Consequently, even by a weak pushing force, the lead pin P can smoothly be thrust between both elastic contact pieces 13, 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact into which a lead pin of an electronic component (IC chip or the like) can be inserted with a weak insertion force.

As the above contact, there is one proposed by the present applicant in Japanese Patent Application No. 4-5314. The contact is held by a base member, and a lead pin of an electronic component is inserted into an insertion hole formed in a slide member that is slidable with respect to the base member. When the lead pin is inserted, the lead pin extends in front of the contact and engages or does not contact the contact, so that the insertion force up to this point is zero. Then, by sliding the slide member with respect to the base member, the lead pin is pushed into the contact through the opening of the contact.

Here, as shown in FIGS. 4 and 5, the conventional contact has a pair of plate-like elastic contact pieces 43, which are vertically arranged so as to face each other. As shown in FIG. 4 (A), these elastic contact pieces 43, 43 are integrally connected to the main body section 41 at the bottom,
The upper part is formed by being bent in a diagonal straight line so as to approach the other party. Further, the front end portion 43a of each elastic contact piece 43 is also formed by cutting out in a diagonal linear shape.

Both elastic contact pieces 43 thus formed,
The side surface of the lead pin P of the electronic component is brought into contact with the front end portions (openings) 43a, 43a of 43. Then, as it is, the lead pin P is pushed between the two contact pieces so as to spread the elastic contact pieces 43, 43, and is pushed further deeper. As a result, the contact 40 contacts the lead pin P while sandwiching it. Both elastic contact pieces 4
The pinching force of the lead pin P by 3, 43 is determined according to the difference between the initial gap before the lead pin is received and the gap after the lead pin is received (the diameter of the lead pin) between the upper ends of the elastic contact pieces 43, 43. The larger the value, the stronger the clamping force.

[0005]

However, the contact 40 as described above has a problem that a large pushing force is required when the lead pin P is interrupted between the elastic contact pieces 43, 43. That is, since each contact piece 43 is formed in a linear shape so that the upper part approaches the other party, the lead pin P initially contacts the portion of the front end portion 43a of each contact piece 43 from the lower part. Therefore, the distance L'between the initial contact position (initial contact position 43b) and the lower portion (hereinafter referred to as the deformation fulcrum) 42 connected to the main body 41 is reduced, and if a large force is applied accordingly. The contact pieces 43, 43 cannot be spread against the elastic force. Further, since the front end portion 43a of each elastic contact piece 43 is cut out in a slanting linear shape, even if the interruption of the lead pin P progresses and the elastic force of the both contact pieces 43, 43 to return to the original state increases, The pushing force applied to the lead pin P is not efficiently transmitted to the elastic contact pieces 43, 43 in a direction to spread them, and a large pushing force is required accordingly.

The present invention has been made in view of the above problems, and it is possible to easily push the lead pin between both elastic contact pieces even with a weak force, and to secure a sufficient holding force after pushing. The purpose is to provide the contact made.

[0007]

In order to achieve the above object, the contact of the present invention is formed by notching the upper front end portion of each elastic contact piece in a curved shape that bulges upward, The upper part is formed by bending it in a curved shape that bulges upward so that it approaches the other party.

[0008]

In such a contact, the lead pin initially contacts the curved portions of the upper front ends of both elastic contact pieces, but the height from the aforementioned deformation fulcrum to the contact position is higher than that of the conventional one. Get higher Further, when a pushing force is applied to the lead pin, the pushing force applied to the lead pin is efficiently transmitted in a direction in which both elastic contact pieces are spread as the lead pin deeply cuts between the curved portions. Therefore, the lead pin can be smoothly inserted between both elastic contact pieces even with a weak pushing force.

Further, since both elastic contact pieces are bent in a curved shape so as to get closer to each other as they go upward, a sufficient gripping force can be obtained while keeping the height to the contact portion (upper end portion) to the lead pin low. An initial gap that can be created can be left between the upper ends of both elastic contact pieces.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1A, 1B and 2 show a contact 10 according to the present invention. This contact 10 is integrally connected to the main body 11 extending vertically in FIG. 1B and FIG. 2 and the left and right of an intermediate portion in the vertical direction of the main body 11 via connecting portions 12 and 12. A pair of plate-shaped elastic contact pieces 13 and 1 which are bent to the front side and vertically arranged so as to face each other.
3 and 3. The lower part of the main body 11 is
It is soldered to a board (not shown).

As shown in FIG. 1 (B), each elastic contact piece 13 is curved inward (arcuately) so as to bulge (convex) upward from the upper portion of each connecting portion 12 in a front view. It is bent and formed. Therefore, both elastic contact pieces 1
3 and 13 are closer to each other as they go up, and an initial gap S with a width that allows an appropriate clamping force to be obtained between the upper ends.
Is left.

The front end portion of each elastic contact piece 13 is shown in FIG.
As shown in, it extends straight upward from the lower end to the vicinity of the upper end. The vicinity of the upper end portion is formed by cutting out in a curved surface shape (arcuate shape) so as to bulge upward (become convex). Hereinafter, this portion is referred to as a front end cutout portion 13a.

A lead pin P of an electronic component (not shown) is press-fitted into the contact 10 thus formed. First, as shown by a chain line in FIGS. 1 and 2, the lead pin P has a side surface on which the front end notch portion 1 of both elastic contact pieces 13 and 13 is formed.
It is brought into contact with 3a and 13a. The initial contact position of the lead pin P will be referred to as initial contact points 13b and 13b of the elastic contact pieces 13 and 13, respectively.

Next, as shown in FIG. 1A, the lead pin P is pushed in a direction of approaching the main body 11. This pushing force acts diagonally laterally on both elastic contact pieces 13, 13 via the front end notches 13a, 13a. Therefore, the elastic contact pieces 13 and 13 are pushed and spread while elastically deforming with the connecting portions 12 and 12 as fulcrums.

Here, the height L of the initial contact points 13b, 13b from the connecting portion 12 is higher than that of the conventional one (L ') shown in FIG. Therefore, both elastic contact pieces 13, 1
Even if the pushing and spreading force applied to 3 is smaller than the conventional one, these both elastic contact pieces 13 and 13 can be pushed and spread against the elastic force. Further, as shown in FIG. 3, the front end notch 1
As the interruption of the lead pin P with respect to 3a and 13a progresses, the direction of the force received by the elastic contact pieces 13 and 13 from the lead pin P approaches the direction in which they should be moved, and this force acts effectively as a spreading force. Both elastic contact pieces 13, 13 can be spread more smoothly than the conventional one in which the linear shape is formed.

The lead pin P, which is interposed between the elastic contact pieces 13 and 13 in this manner, is pushed further deeply to be sandwiched between the elastic contact pieces 13 and 13. In this way, the contact 10 can contact the lead pin P while holding it. Here, as shown in FIG. 2, the range H in which each lead pin P can be sandwiched in each elastic contact piece 13 is wider than the conventional range (H ′). Therefore, the lead pin P
Even if the lead pin P is not pushed in until it comes close to the full body portion 11, the lead pin P can be securely held.

[0017]

As described above, if the contact of the present invention is used, the height of the lead pin to the initial contact position at the upper front ends of both elastic contact pieces (height from the deformation fulcrum).
Can be higher than the conventional one. Further, when a pushing force is applied to the lead pin, the pushing force applied to the lead pin is efficiently transmitted in a direction in which both elastic contact pieces are spread as the lead pin deeply cuts between the curved portions. Therefore, the lead pin can be smoothly inserted between both elastic contact pieces even with a weak pushing force.

Further, since both elastic contact pieces are curved in a curved shape so as to get closer to each other as they go to the upper part, the height of the contact portion (upper end portion) to the lead pin is kept low and the lead pin is sufficiently clamped. Can generate force.

[Brief description of drawings]

FIG. 1A is a plan view of a contact according to the present invention, and FIG. 1B is a front view of the contact.

FIG. 2 is a side view of the contact.

FIG. 3 is an enlarged plan view of an upper portion of an elastic contact piece of the contact.

FIG. 4A is a plan view of a conventional contact,
(B) is a front view of this contact.

FIG. 5 is a side view of the conventional contact.

[Explanation of symbols]

 10,40 Contact 11,41 Main body 13,43 Elastic contact piece 13b, 43b Initial contact point P Lead pin

Front page continuation (72) Inventor Hiroshi Kanzaki No. 510 Minamikochi Futakoji, Takatsu-ku, Kawasaki-shi, Kanagawa No. 3 Inoue Building Ogut Co., Ltd.

Claims (1)

[Claims] 1. A pair of plate-shaped elastic contact pieces arranged upright so as to face each other, and side surfaces of lead pins of an electronic component are brought into contact with upper front end portions of these elastic contact pieces, and the lead pins are left as they are. In a contact that contacts the lead pin while sandwiching the lead pin by being pushed between the elastic contact pieces, the upper front end portion of each elastic contact piece is formed by cutting out in a curved shape that bulges upward, and A contact characterized in that each elastic contact piece is formed by bending it into a curved shape that bulges upward so that the upper part approaches the other party.