JPH0145951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a female contact used in an electrical connector, and more particularly to a type of contact that receives a mating contact from the side.

An example of this type of female contact is shown in FIG. In FIG. 1, a pair of opposing spring pieces 1, 1' are connected at their lower portions by a connecting portion 2. As shown in FIG. Furthermore, following the lower end of one of the spring pieces 1, a fixing part 3 and a connecting part 4 are integrally provided to be held by an insulator (not shown). Further, the upper ends of the pair of spring pieces 1, 1' each have integrally bent pieces 5, 5' bent at right angles in a direction toward each other. Pair of bent pieces 5,
The tip of 5' has a corresponding contact insertion guide surface 6 facing each other in a V-shape when viewed from above;
This is followed by a mutually planar counterpart stable contact surface 7 . Then, the corresponding pin contact 8 is inserted from the side as shown by the arrow 9, and is pressed against the insertion guide surface 6 to deflect the pair of spring pieces 1 and 1' away from each other, while contacting the stable contact surface 7. , this contact is configured. However, the contact shown in FIG. 1 has the following disadvantages because the pair of spring pieces 1, 1' are in parallel positions when viewed from above.

First, with reference to Figure 2, the corresponding pin contact 8
The force P ₁ that pushes the corresponding contact insertion guide surface 6 during insertion must be larger than the reaction force W ₁ of the spring pieces 1, 1' due to the boosting effect, as can be seen from the following equation.

P ₁ =1/cos θW ₁ (1) Therefore, a relatively large insertion force R ₁ is required to insert the corresponding pin contact 8.

Further, referring to FIG. 3, the force pushing the corresponding contact stable contact surface 7 when the corresponding pin contact 8 is inserted is completed, that is, the contact force P ₂ is the reaction force of the spring pieces 1 and 1' as can be seen from the following equation. You can only get a size equal to W ₁ .

P ₂ = W ₂ ...(2) Here, in order to increase the contact force P ₂ , spring pieces 1,
If the reaction force W ₁ of 1' is designed to be large, there is a problem that the insertion force R ₁ becomes even larger.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a female contact which requires less force to insert a mating contact and which provides a greater contact force.

According to the present invention, between the other ends of a pair of opposing spring pieces having one end fixed, a contact insertion guide surface facing each other in a V-shape when viewed from the axial direction connecting the one end and the other end; In a contact forming a V-shaped constricted end of the corresponding contact insertion guide surface and a stable contact surface of the corresponding contact parallel to each other, the pair of spring pieces themselves are also connected to the corresponding contact insertion guide surface. A contact is obtained which is characterized by exhibiting a V-shape in the same direction as the above.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows an embodiment of a contact according to the invention. In FIG.
1' are facing each other in a V-shaped posture when viewed from above. The upper ends of the spring pieces 11, 11' integrally have bent pieces 15, 15' bent at right angles in a direction toward each other. The tips of these bent pieces 15, 15' have corresponding contact insertion guide surfaces 16 facing each other in a V-shape when viewed from above, and corresponding contact stable contact surfaces 7 that are parallel to each other. is forming. Here, the V-shaped shape of the corresponding contact insertion guide surface 16 is as follows.
The direction is chosen to be the same as the V-shaped shape of the spring pieces 11, 11'.

Further, at the lower end of the connecting part 12, a fixing part 13 and a connecting part 14, which are to be held by an insulator (not shown), are continuously and integrally provided.

Then, the corresponding pin contact is inserted from the side, pushes the insertion guide surface 16, and presses the pair of spring pieces 11 and 1.
1' are bent in the direction away from each other and brought into contact with the stable contact surface 17, as in the conventional case.

The contact shown in Figure 4 consists of a pair of spring pieces 1
Since the contacts 1 and 11' have a V-shape in the same direction as the corresponding contact insertion guide surface 16 when viewed from above, the contact has the following advantages over the conventional contact shown in FIG.

First, referring to Fig. 5, select the corresponding pin contact 1.
Contact insertion guide surface 16 for when 8 is in the middle of insertion
The force _P3 for pushing is given by the following formula.

P ₃ =1/cos(θ−α)W ₁ (3) Here, if α≒θ, the force P ₃ is hardly subjected to boosting action, so P ₃ ≒W ₁ . Therefore, the force required to insert the corresponding pin contact 18 is R ₃
is the insertion force in the contact shown in Figure 1.
It is smaller than _R1 .

Furthermore, referring to FIG. 6, when the insertion of the corresponding pin contact 18 is completed, the corresponding contact stable contact surface 1
As can be seen from the following equation, the force pushing 7, that is, the contact force P ₄ is boosted by the reaction force of the spring pieces 1 and 1'.
W becomes larger than ₁ .

P ₄ = 1/cosαW ₁ ...(4) By the way, in the above explanation, for convenience, we ignored the frictional force and explained as α≒θ, but when the frictional force is taken into account, there is some difference between the angles θ and α. Sometimes there are differences. For practical purposes, it is preferable to design θ to be approximately 30°.

Further, FIGS. 7 to 9 each show other embodiments of the present invention. Although these embodiments differ slightly in appearance from the embodiment shown in FIG. 4, they have substantially the same effect.

As explained above, the contact of the present invention is
The corresponding contact can be inserted smoothly and effortlessly with a relatively small force, and after the insertion is completed, the contact is made with a relatively strong force, so that reliable contact can be achieved.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a conventional example of a contact, FIG. 2 is an explanatory diagram of the operation when the corresponding contact is being inserted, FIG. 3 is an explanatory diagram of the operation when the corresponding contact has been inserted, and FIG. 4 is a diagram according to the present invention. FIG. 5 is an explanatory diagram of the operation when the corresponding contact is being inserted, FIG. 6 is an explanatory diagram of the operation when the corresponding contact has been inserted, and FIG. 7 is an external perspective view of one embodiment of the contact.
9 to 9 are perspective views of other different embodiments of the contact according to the present invention. 11, 11'... Spring piece, 13... Fixed part, 1
6... Compatible contact insertion guide surface, 17... Compatible contact stable contact surface, 18... Compatible pin contact.

Claims (1)

[Claims] 1. Between the other ends of a pair of opposing spring pieces with one end fixed, corresponding contact insertion guide surfaces facing each other in a V-shape when viewed from the axial direction connecting the one end and the other end, and the corresponding contact insertion guide surface. In a contact in which a V-shaped concave end of the guide surface is followed by a stable contact surface for the corresponding contact that is parallel to each other, the pair of spring pieces themselves also have a halves in the same direction as the corresponding contact insertion guide surface. A contact characterized by exhibiting a square shape.