JP2002289298A - Movable connector assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a moving amount of a movable connector assembly, to absorb three-dimensional dislocation between connectors, and to make it durable without applying dislocation load to a contact when inserting/removing the connector. SOLUTION: A movable connector assembly 1 has one connector 2 and the other connector 200. The connector 2 has an inner housing 100 holding a contact 114 and an outer housing 8 movably supporting this housing 100 through a coil spring 12 and a rod 10. The connector 200 has an inner housing 300 holding a contact 310 and an outer housing 202 supporting this inner housing 300 through a pin 228 and a coil spring 230. Both the connectors 2 and 200 have a guide means 216, the rod 10 is deviated like a pivot when fitted, both the inner housings 100 and 300 are aligned and fitted, and the contacts 114 and 310 are brought into contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable connector assembly.

[0002]

2. Description of the Related Art A connector assembly of this kind generally has a floating mechanism (floating mechanism) for absorbing or compensating for a positional shift between connectors. For example, JP-A-6-60953 (Japanese Patent No. 2552225)
JP-A-6-231840 and JP-A-3-3939.
A movable connector disclosed in each publication of No. 268 is known. In these movable connectors, there is a connector having a female contact having two contact pieces, and another connector having a male contact inserted between the contact pieces. An elastic portion is formed so as to be able to follow the positional deviation between the connectors during fitting. When the connectors are fitted together, the male contacts are inserted into the female contacts by a predetermined fitting length and are electrically connected.

[0003]

This type of connector is
For example, it is used by attaching an electric display function to a door (lid), for example, a main body of an electric refrigerator having a liquid crystal panel, and the door. In particular, in recent years, in the case of a refrigerator in which the door can be opened to both the left and right, a three-dimensional displacement occurs with respect to the refrigerator body when the door is opened and closed due to a unique mechanism of the hinge portion of the door. Moreover, the unique door hinge mechanism has the feature that the displacement between the door and the main body is large. In such a refrigerator, when an electric display function is provided on the door, connectors mounted on the door and the body of the refrigerator are required to have a large shift amount (floating amount) and durability to withstand multiple insertions and removals. .

In the above-described prior art connector assembly, since male contacts are inserted into female contacts by a predetermined length and connected, if the amount of displacement between the connectors during connector insertion and removal is large, A large force may be applied to a contact portion serving as an electrical contact of the contact. That is, when the male contact located between the two contact pieces of the female contact is shifted to press the contact piece, the male and female contacts become
There is a possibility that a large load is applied and plastic deformation of the contact is caused. Further, in the above-described prior art, since the displacement is coped with by the elastic portion of the contact, there is a problem that the amount of floating (the amount of floating) is small. In addition, when the insertion and removal of these contacts are repeated many times, the life of the contacts may be shortened.

The present invention has been made in view of the above points, has a large amount of play, can absorb positional displacement between connectors in all directions, and does not impose a load on the contacts when the connectors are inserted and removed. It is an object of the present invention to provide a movable connector assembly having the following features.

[0006]

SUMMARY OF THE INVENTION A movable connector assembly of the present invention includes an inner housing having at least one contact and an outer housing for holding the inner housing free to move through a spring member. A guide having a connector and another connector mating with one connector having the other contact in contact with one contact, wherein the inner housing and the other connector cooperate with each other to position when mated. Means, and at least one of the one contact and the other contact has an elastic portion so as to be urged toward the other contact, and both contacts come into contact with each other It is characterized by having such a configuration.

[0007] The spring member may be a plurality of compression coil springs each having one rod therein for loosely connecting the inner housing and the outer housing.

Further, one of the contacts may be pin-shaped, the other contact may have an elastic portion, and both contacts may have contact surfaces at their ends which contact each other in a contact state.

The term "pin-shaped" refers to an elongated shape having an outer shape, and includes a case where the cross-sectional shape is a circular rectangle or another shape.

[0010]

The movable connector assembly according to the present invention includes one connector having an inner housing having contacts, an outer housing holding the inner housing via a spring member, and the other connector having the other contacts. Wherein the inner housing and the other connector each have a guide means for positioning in cooperation with each other at the time of fitting, and at least one of the one contact and the other contact is provided with a mating contact. It has an elastic portion so as to be urged toward, and is configured so that both contacts are in contact with each other, so that the following effects are obtained.

That is, since the positional deviation is absorbed or compensated by the rod and the coil spring, the amount of play is large, and the positional deviation between the connectors in all directions can be absorbed. Furthermore, since the contacts are in contact with each other, even if there is a displacement in a direction intersecting with the insertion / removal direction, no load (bending stress) is applied to the contacts, and the electrical connection portions of the contacts may be deformed. There is no. Therefore, the reliability of the electrical contact can be maintained, and a durable movable connector assembly can be obtained.

In the case where the spring member is a plurality of compression coil springs each having one rod therein for connecting the inner housing and the outer housing in a floating manner, the elasticity of the rod and the coil spring makes it possible to provide a three-dimensional structure. Accordingly, a movable connector assembly having a large amount of movement in all directions can be obtained. Since the displacement can be compensated for in any direction, it can be used for a wide range of applications.

In the case where one of the contacts has a pin shape, the other contact has an elastic portion, and the two contacts have contact surfaces at their ends which are in contact with each other, the contact Since the two contacts come into contact with each other, no load is applied to the contacts, and there is no risk of plastic deformation. Therefore, a durable movable connector assembly can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a movable connector assembly (hereinafter, simply referred to as an assembly) according to the present invention will be described in detail with reference to the accompanying drawings. Figure 1
FIG. 2 is a perspective view of one connector constituting the assembly 1 of the present invention. FIG. 2 is a cross-sectional view of the connector 2 of FIG.
(A) is a sectional view along the line 2A-2A in FIG. 1, (B)
Shows cross-sectional views along line 2B-2B in FIG. Hereinafter, the connector 2 attached to the refrigerator door will be described with reference to FIGS. 1 and 2. Note that, in the description, the front side or the front side refers to a fitting portion side to be fitted with a mating connector.

The connector 2 has a rectangular resin outer housing (hereinafter, simply referred to as a housing) 8 having a rectangular flange 4 on the periphery of the fitting portion side, and a metal rod 10 and a spring member in the housing 8. That is, it has a resin inner housing (hereinafter simply referred to as a housing) 100 movably attached via a compression coil spring (hereinafter simply referred to as a coil spring) 12. Housing 8
A recess 6 is formed in the inside, and a mating connector 2 to be described later is formed.
The guide projections 214, 216 (FIG. 3)
It is configured to accept Bottom wall 1 of housing 8
4 are provided with four spaced mounting holes 16 for mounting the rod 10. The mounting hole 16 has a dish shape or a mortar shape having a large diameter on the inner surface side of the housing 8 and a small outer diameter.

The housing 100 has an outer shape sized to be received in the recess 6 of the housing 8, and has a locking hole 102 at a position corresponding to the mounting hole 16 of the housing 8. At a substantially central portion of the housing 100, a rectangular fitting concave portion 104 into which a fitting portion of the other connector 200 described later is inserted is formed. A connection portion 106 that is electrically connected to the other connector is arranged in the fitting recess 104. The connecting portion 106 includes a plurality of contacts (one contact) 1 at a portion surrounded by two separated end walls 108 and a side wall 110 that integrally connects the end walls 108 on one side.
2 (FIG. 2A). A concave portion 116 is formed on the back side of the connection portion 106 so that an electric wire (not shown) is connected to the contact 114.

At four corners of the fitting recess 104, passages 118 communicating with the locking holes 102 are formed. The rod 10 is inserted through the passage 118 and the coil spring 1 interposed between the housing 8 and the housing 100.
2 and attached to the mounting hole 16 of the housing 8. The rod 10 has a head 1 that is larger in diameter than its shaft 18.
The head 120 is locked in the locking hole 102. On the other hand, the distal end portion 20 of the rod 10 is
A spring washer (trade name: “push nut”) 22 or the like protruding from the mounting hole 16 of the bottom wall 14 and having a chrysanthemum seat portion at the tip end portion 20 is attached to prevent falling off.

A metal plate 9 through which a rod 10 passes is disposed on the inner surface and the outer surface of the bottom wall 14, respectively.
2 and the washer 22. Thus, the housing 100 is held in a state of being urged forward of the housing 8 by the cooperation of the rod 10 and the coil spring 12. Although the rod 10 is attached to the mounting hole 16, the part of the mounting hole 16 is used as a pivot fulcrum,
It is mounted so that it can move in any direction.
When a force is applied to the housing 100 from the front, the coil spring 12 is bent, and the housing 100 can move into the recess 6.

At both ends of the housing 100, guide notches (guide means) 122 which are cut out outward are formed. The guide notch 122 is provided in the housing 100.
Slopes 128, 128 facing the longitudinal direction of the housing 100 from the end faces 124, 126 of the housing 100, and inclined so as to converge from the front to the rear, and the slope 13 extending so as to converge continuously from the front to the rear from the slope 128.
Has zero. Further, the guide notch 122 is formed on the slope 12.
8, 130, and extend inward (rearward) to form an end face 1
24 or an end face 126 has a guide groove 132 opened. The function of the guide notch 122 will be described later.

As shown in FIG. 2, a rectangular opening 5 is formed substantially at the center of the housing 8.
The electric wire connected to the contact 114 is led out from the opening 5. On the outer surface and the inner surface of the housing 8, the above-described metal plates 9 each having a rectangular hole 7 are arranged so as to surround the opening 5. Each metal plate 9 has a hole (not shown) through which a rod 10 is inserted.
It is drilled corresponding to the rod 10, and the rod 10 is fixed to the housing 8 via the metal plate 9. The metal plate 9 is for protecting the resinous housing 8 from being twisted by the coil spring 12 and the C-ring 22.

Next, the other connector attached to the main body of the refrigerator will be described with reference to FIGS. FIG. 3 is a perspective view of the other connector 200, and FIG.
4 is a cross-sectional view of the connector of FIG. 3, FIG. 4A is a cross-sectional view taken along 4A-4A of FIG. 3, and FIG.
The sectional view which follows the B-4B line is shown.

The connector 200 has a resin outer housing (hereinafter simply referred to as a housing) 202 and a resin inner housing (hereinafter simply referred to as a housing) 300 held by the housing 202. The housing 202 includes a base portion 208 having an outer shape smaller than the flange 4 of the housing 8 described above, and a pair of brackets 21 integrally formed on a rear portion of the base portion 208.
0 is integrated. The housing 8 is attached to the base 208.
And a fitting recess 206 large enough to receive the above-described housing 100 inside the flange 204.

A rectangular opening 212 for receiving the housing 300 is formed substantially at the center of the fitting recess 206. The housing 3 is provided at both ends of the fitting recess 206.
00 on the longitudinal extension of said guide notch 122
Guide projections (guide means) 214, 216
Are formed. The guide projections 214 and 216 extend from the flange 204 to the fitting recess 206 so that the housing 2
02 protrudes forward integrally. Each guide projection 21
4 and 216 have the same size and shape, and have a substantially flat plate shape along the longitudinal direction of the base 208. The tips of the guide projections 214 and 216 have roundness,
The base portion 208 is formed to be higher in the longitudinal direction, that is, the outer side in the X direction in FIG. 3, and to be inclined rearward as it goes inward. In addition, this guide protrusion 214,
216 in the thickness direction of the housing 100
Is set to a size that can pass through the guide groove 132.

Each bracket 210 is spaced apart from each other by X
It comprises a wall 220 protruding along the direction and a mounting wall 222 extending perpendicularly from the tip of the wall 220. Reinforcing ribs 224 protrude from the wall 220. At a substantially center of the mounting wall 222 of the bracket 210, one mounting hole 226 for inserting a pin 228 for mounting the housing 300 is formed.

Next, the housing 300 will be described. The housing 300 includes a main body 306 disposed between the walls 220, a rectangular receiving section 308 protruding from a front portion of the main body 306, and a fitting section 304 further protruding from the receiving section 308. Have. The fitting portion 304 has a recess 30
2 are formed, and a contact (the other contact) 310 is provided therein. The accommodated portion 308 is similar in shape to the opening 212, and is configured to fit loosely into the opening 212.

The head 22 is located near the wall 220 of the main body 306.
An opening 311 through which a pin 228 having 8a is inserted is formed. The pin 228 is attached to the mounting hole 226 of the mounting wall 222.
, And further inserted into the opening 311, and fixed by attaching an E-ring (not shown) to the tip. Pin 2
28 is the mounting wall 222 and the main body 306 of the housing 300
Are inserted through a compression coil spring (hereinafter, simply referred to as a coil spring) 230 disposed between
Is mounted in a state of being urged forward. But,
The housing 300 can be displaced inward by bending the coil spring 230 when receiving a force from the front when fitting the connectors. At this time, the housing 300
The accommodated portion 308 is guided by the opening 212, and the main body 306 is guided by the wall 220 of the bracket 210.

Next, the behavior of each of the connectors 2 and 200 when the connectors are fitted will be described with reference to FIGS. 5A and 5B show the positional relationship between one connector 2 and the other connector 200 before the start of fitting. FIG. 5A is a front view, and FIG. 5B is the positional relationship shown in FIG. FIG. 5C is a side view as viewed from an arrow 5C in FIG. 5A. FIG. 6 is a view similar to FIG. 5 showing a positional relationship between the connector 2 and the connector 200 at the initial stage of fitting.
FIG. 6A is a front view similar to FIG. 5A, and FIG.
Is a cross-sectional view similar to FIG. 5B, and FIG.
It is a side view similar to (C). FIG. 7 is a view similar to FIG. 5 showing the positional relationship between the connector 2 and the connector 200 immediately before the end of the fitting. FIG. 7A is a front view similar to FIG. FIG. 7B is a sectional view similar to FIG.
(C) is a side view similar to FIG. 5 (C). FIG.
FIG. 8A is a view similar to FIG. 5 showing a positional relationship between the completely fitted connector 2 and the connector 200, and FIG.
8A is a front view similar to FIG. 5B, FIG. 8B is a cross-sectional view similar to FIG. 5B, and FIG. 8C is a side view similar to FIG. 5C.

First, as shown in FIG. 5, before the start of fitting, the connector 2 is
In (A), the position is shifted to the right.
That is, it is shifted to the right in the longitudinal direction (X direction).
Also, in the short direction (Y direction), as shown in FIG. 5C, the connector 2 is displaced rightward with respect to the connector 200. The reason why the connector 2 and the connector 200 are not displaced in parallel is because the connector 2 is shown as a connector attached to the door side of the refrigerator and thus has an angle of rotation about a hinge (not shown). Further, the large displacement in the Y direction is caused by the three-dimensionally opening and closing movement of the refrigerator door in a special relationship until the door is completely closed with respect to the refrigerator main body. In this state, as shown in FIG. 5B, the connection portion 106 of the connector 2 and the connector 20
It can be seen that the 0 fitting portion 304 is considerably displaced.
At this time, the guide notch 122 of the connector 2 is located near the guide protrusion 214 of the connector 200. The guide projection 214 is about to be guided by one slope 128 of the guide notch 122.

Next, in the initial state of the fitting, as shown in FIG. 6, the connector 2 and the connector 200 further approach each other, and the housing 100 of the connector 2 and the connector 200
Guide projections 214 and 216 partially overlap each other. That is, the guide protrusion 214 enters the guide notch 122, and the slope 130 contacts the guide protrusion 214 (FIG. 6B). Since the base portion 208 of the connector 200 is fixed, the housing 100 moves to the left as shown in FIG. 6B by the cooperation of the slope 130 and the guide protrusion 214. At this time, when the rod 10 pivots to the left, the connectors 2 and 200 are moved.
It is important to absorb the displacement in the X direction in FIG. Since this displacement exists not only in the X direction but also in the Y direction in FIG.
As shown in (C), the guide projection 214 and the inclined surface 128 cooperate to shift the housing 100 to the left to absorb the displacement. Accordingly, although not shown in FIG. 6, it can be understood that the rod 10 is also shifted in the Y direction.

Next, when the connectors 2 and 200 are fitted together,
The state immediately before the end of the fitting, which has been considerably advanced, will be described with reference to FIG. Even in this state, it can be seen from the appearance shown in FIG. 7A that the connector 2 and the connector 200 are considerably displaced from each other. In this fitting stage, the engagement between the inclined surface 130 of the housing 100 and the guide protrusion 214 further advances, and the tip portion 214a of the guide protrusion 214
Has entered the guide groove 132 of the housing 100. As a result, the housing 100 further shifts in the X-axis direction and the Y-axis direction, and the other guide protrusion 216 also enters the guide notch 122 and the guide groove 132. 216. Accordingly, the connecting portion 106 of the connector 2
Approach so as to align with the fitting portion 304 of the connector 200. At this stage, the inclination of the rod 10 becomes maximum. Thus, the pivot movement of the rod 10
A large displacement of the housing 100 is possible. In the movable connector assembly of the present invention, the deviation amount (the amount of play) for absorbing the displacement can be as large as about ± 5 mm in the X direction and about 2.8 mm in the Y direction. Further, a deviation of ± 1.2 mm is possible in the fitting direction.

FIG. 8 shows a state in which the connector 2 and the connector 200 are brought close to each other and completely fitted together. In this completely fitted state, the housings 8 and 202 of the connectors 2 and 200 are
Due to the fitting of the fitting recess 206 of the housing 1 and the housing 202, the positional shift is substantially eliminated. As described above, the connector 2 attached to the door side is largely displaced with respect to the other connector 200 during the fitting process, but when the fitting is completed, the positional displacement is eliminated. In the completely fitted state, as shown in FIG. 8B, both guide projections 214 and 216 pass through the guide groove 132 and
The housing 100 is arranged in the fitting recess 206 of the connector 200 (FIG. 8B), and the metal contacts 114 and the contacts 310 come into contact with each other.

The completely fitted state will be described with reference to FIG. FIG. 9 is a sectional view along the Y direction of the assembly 1 of the present invention in a completely fitted state. FIG. 8 (B),
As shown in FIG. 9, the fitting part 304 of the connector 200 is housed in the fitting recess 104 of the connector 2, and the connection part 106 holding the contact 114 of the connector 2 is housed in the fitting part 304 of the connector 200. Have been. At this time,
Since the housing 100 and the housing 300 are urged by the coil springs 12 and 230, respectively, the coil springs 12 and 230 are bent to maintain an appropriate positional relationship in a contact state.

Next, referring to FIG.
4, 310 will be further described. FIG. 10 shows the respective contacts 1 when the connectors 2, 200 are fitted together.
14, housing 1 of connector 2 showing the behavior of 14, 310
FIG. 10A is a schematic sectional view of a housing 300 of the connector 200, and FIG.
00 and 300, and FIG. 10B shows both housings 100 and 300 fully fitted. However, in FIG. 10, the contact portion 138 of the contact 114 is
Except for 4, it has a shape similar to that of FIG. Also, each contact 114,
310 is shown without cutting.

The contact 114 has a contact portion 138 formed at the tip of a columnar main body 136. Contact part 138
Is formed by bending, and a connector 2,
200 has a flat contact surface 134 substantially perpendicular to the insertion / extraction direction.

The contact 310 of the housing 300
It is composed of two metal plates. In other words, it is composed of a bent spring piece 312 and a flat support plate 314. The spring piece 312 has a substantially U-shaped tip 316.
And a similar U-shaped rear end portion 318 and an elastic portion 320 connecting therebetween. A contact surface 330 that contacts the contact surface 134 of the contact 114 is formed at the distal end 316. The contact surface 330 slightly protrudes from the front surface 322 of the housing portion 308 of the housing 300.

The other support plate 314 has a base 324, a tine 326 extending rearward from the base 324, and a support 328 extending forward. The support portion 328 supports the free end of the tip portion 316 when the free end moves backward, that is, inward of the housing 300 when the contacts come into contact with each other. The base 324 of the support plate 314 is provided with a substantially U-shaped holding piece 33 for holding the rear end 318 of the spring piece 312 described above.
6.

Next, attachment of the contact 310 will be described. The spring piece 312 is connected to a contact insertion slot (hereinafter simply referred to as a slot) 3 of the housing 300.
In FIG. 10, the U-shaped rear end 318 is attached to the mounting rib 334 of the housing 300 and attached to the housing 300. Next, the support plate 314 is similarly inserted into the slot 332,
The holding piece 336 is attached to the mounting rib 334 by covering the rear end portion 318 of the spring piece 312 and attaching the holding piece 336 to the spring piece 312. In this state, the elastic portion 320 can be bent in the left-right direction in the slot 332 in FIG.

Next, a state where the connectors are fitted to each other will be described. When the housing 100 and the housing 300 are fitted to each other, as shown in FIG. 10B, the contacts 114 and 310 are respectively brought into contact with the contact surfaces 134 and 3.
30 are in contact with each other and are electrically connected. At this time,
The elastic portion 320 of the contact 310 is elastically deformed and the tip portion 316 is slightly pushed inward while its free end is supported by the support portion 328. This allows
Reliable electrical contact is made between the abutment surfaces 134, 330.

When the connectors 2 and 200 are separated from each other, the above steps are performed in reverse order.

Although the assembly according to the present invention has been described in detail, it is not limited to the embodiment of the present invention.
Various modifications and changes are possible. For example, contact 1
Although the positive elastic portion is not formed on the contact 14, an elastic portion may be formed on the contact 114. Also, the assembly of the present invention has been described as an embodiment that can be attached to a door and a main body of a refrigerator, but is not limited to a refrigerator, and is used in a wide range of applications due to the large amount of play. Of course, it can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view of one connector constituting a movable connector assembly of the present invention.

FIGS. 2A and 2B are cross-sectional views of the connector of FIG. 1; FIG. 2A is a cross-sectional view taken along line 2A-2A of FIG. 1;
2A and 2B show cross-sectional views along line -2B, respectively.

FIG. 3 is a perspective view of another connector constituting the movable connector assembly of the present invention.

FIGS. 4A and 4B are cross-sectional views of the connector of FIG. 3, wherein FIG. 4A is a cross-sectional view taken along 4A-4A of FIG. 3, and FIG.
Sectional views along line 4B are shown.

5A and 5B show a positional relationship between one connector and the other connector before the start of fitting, wherein FIG. 5A is a front view and FIG.
FIG. 5A is a cross-sectional view showing the positional relationship shown in FIG.
(A) is a side view seen from arrow 5C.

FIG. 6 is a view similar to FIG. 5, showing a positional relationship between one connector and the other connector at the initial stage of fitting; FIG. 6A is a front view similar to FIG. 5A; FIG. 5B is a sectional view similar to FIG. 5B, and FIG. 5C is a side view similar to FIG. 5C.

FIG. 7 is a view similar to FIG. 5, showing a positional relationship between one connector and the other connector immediately before the end of the fitting;
5A is a front view similar to FIG. 5A, FIG. 5B is a cross-sectional view similar to FIG. 5B, and FIG. 5C is a side view similar to FIG. 5C.

FIG. 8 is a view similar to FIG. 5, showing the positional relationship between one connector and the other connector that are completely fitted, and FIG.
5A is a front view similar to FIG. 5A, FIG. 5B is a cross-sectional view similar to FIG. 5B, and FIG. 5C is a side view similar to FIG. 5C.

FIG. 9 is a sectional view along the Y direction of the movable connector assembly of the present invention in a completely fitted state.

FIGS. 10A and 10B are schematic cross-sectional views of a housing of one connector and a housing of the other connector, showing a behavior of a contact when the connectors are fitted. FIG. B) shows both housings which are completely fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable connector assembly 2 One connector 8 Outer housing 10 Rod 12 Spring member (compression coil spring) 100 Inner housing 114 One contact 122 Guide means (notch for guidance) 134 Contact surface 200 The other connector 214, 216 Guide means (guide protrusion) 310 The other contact 320 Elastic part 330 Contact surface

Claims (3)

[Claims] 1. A connector having an inner housing having at least one contact and an outer housing holding the inner housing for movement through a spring member, and another contact contacting the one contact. The inner housing and the other connector each have guide means for cooperating and positioning each other at the time of fitting, and the one contact And the other contact,
A movable connector assembly, characterized in that at least one of the contacts has an elastic portion so as to be urged toward a counterpart contact, and the two contacts are configured to come into contact with each other. . 2. The movable member according to claim 1, wherein said spring member is a plurality of compression coil springs each having a rod therein for movably connecting said inner housing and said outer housing. Type connector assembly. 3. The one contact is pin-shaped,
The movable connector assembly according to claim 1, wherein the other contact has the elastic portion, and the two contacts each have a contact surface at an end thereof in contact with each other.