JP2003346932A - Electric wire connecting terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wire connecting terminal capable of widening the range of a connectable wire diameter. <P>SOLUTION: This electric wire connecting terminal 1 has a terminal strip 2 made of a conductive material, a pressing spring 3 made of an elastic material for electrically connecting a core 61 of the electric wire and the terminal strip 2 by pressing the core 61 of the electric wire to the terminal strip 2, and an electric wire locking member 4 for locking the core 61 of the electric wire by biting the core 61 of the electric wire at its tip, and is stored in a terminal storage chamber 12 formed in a unit body 11. The pressing spring 3 is configurated by first and second spring parts 31, 32 for pressing the core 61 of the electric wire to the terminal strip 2, and a third spring part 33 continuously integrated with both spring parts 31, 32, energizes both spring parts 31, 32 to the neighborhood of the terminal strip 2, and is deflected in the direction to widen the interval between both spring parts 31, 32 and the terminal strip 2 when the deflection amount of the both spring parts 31, 32 is over a predetermined value. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire connection terminal for connecting an electric wire to a terminal plate.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view of a conventional wiring device such as a switch using a wire connection terminal. The body 11 of the switch includes a body 12 on the rear end and a cover 1 on the front end.
3. The body 12 is provided with a terminal storage chamber 14 for storing the wire connection terminal 1 including the terminal plate 2, the locking spring 52, and a release button (not shown). Has an electric wire insertion hole 15 opened.

The terminal plate 51 has a U-shaped portion 51a at one end, and a locking spring 52 is housed in the U-shaped portion 51a to form a quick connection terminal.

As shown in FIG. 9, a locking piece 52b and a pressing piece 52c of a locking spring 52 are formed by bending both ends of a strip made of an elastic material having a high stress limit such as stainless steel. It is formed at both ends of the central piece 52a. Lock spring 5
2 center piece 52a is one side piece 51b of the U-shaped part 51a.
, And the lock piece 52b is connected to the center piece 52a from the connecting portion toward the distal end edge of the other side piece 51c of the U-shaped portion 51a.
Inclining (obliquely upward). The pressing piece 52c of the locking spring 52 is formed in a substantially S-shape, and the locking piece 52b and the pressing piece 52c provided on the locking spring 52 face the other side piece 51c of the U-shaped portion 51a. I do.

When the electric wire 60 is connected to the electric wire connection terminal 1, when the core wire 61 from which the coating of the electric wire 60 is removed is inserted through the electric wire insertion hole 15, the locking spring 52 The conductor of the core wire 61 is sandwiched between the locking piece 52b and the pressing piece 52c and the side piece 51c of the terminal plate 51, and the leading edge of the locking piece 52b bites into the conductor of the core wire 61, so that the core wire 61 comes off. Is prevented. Therefore, by simply inserting the core wire 61 of the electric wire 60 into the electric wire insertion hole 15, the core wire 61 is held and the electrical connection to the terminal plate 51 is made.

The electric wire 6 connected to the electric wire connection terminal 1
To remove the 0 core wire 61, insert the tip of the tool through a tool insertion hole (not shown) opened in the bottom surface of the body 12, push the release button, and move the lock piece 52b to the terminal plate 51 with the release button.
By pressing the wire 60 away from the side piece 51c, the locked state of the electric wire 60 is released, and the electric wire 60 can be easily pulled out.

[0007]

In the electric wire connection terminal 1 having the above structure, the core wire 61 of the electric wire 60 is attached to both ends of the locking spring 52.
And a pressing piece 52c for pressing the core wire 61 of the electric wire 60 against the side piece 51c.
When the core wire 61 of the electric wire 60 is inserted between the lock piece 1c and the lock piece 52b, the lock piece 52b and the pressing piece 52c are separately bent.
FIG. 10 shows the amount of bending x1 of the lock piece 52b and the pressing piece 52c.
x2 and the spring loads F1 and F2 are shown, and the spring loads F1 and F2 applied to the lock piece 52b and the pressing piece 52c are shown.
Respectively increase linearly with the increase in the amount of deflection x1, x2. Assuming that the spring constants of the locking piece 52b and the pressing piece 52c are K1 and K2, the spring load F1 applied to the locking piece 52b is F1 = K1 × x1, and the spring load F2 applied to the pressing piece 52c is F2 = K2 × x2. It is expressed as

Here, a spring portion (locking piece 52b) for locking the core wire 61 of the electric wire 60 and a spring portion (pressing piece 52c) for pressing the core wire 61 of the electric wire 60 are separate parts of the locking spring 52. , The individual spring portions (lock pieces 52
b and the stress limit value of the pressing piece 52c) will depend on the shape and size of each spring portion, and the shape of the spring portion,
When the dimensions are determined to some extent, the amount of deflection of each spring portion is limited due to the relationship of the stress limit value, and as a result, there is a problem that the range of the connectable electric wire diameter cannot be expanded.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wire connection terminal in which the range of connectable wire diameters is widened.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a terminal plate formed of a conductive material and an electric wire formed by pressing an electric wire against the terminal plate are formed of an elastic material. And a terminal spring, and a pressing spring that electrically connects the terminal board and the terminal plate, and an electric wire locking member that locks the electric wire by cutting into the electric wire. First and second spring portions respectively pressing against the terminal plate, and formed integrally and continuously with both spring portions to urge both spring portions in a direction approaching the terminal plate, and the amount of deflection of both spring portions becomes a predetermined value. A third spring portion that bends in a direction in which the distance between the two spring portions and the terminal plate increases when the distance exceeds the third spring portion.

According to a second aspect of the present invention, in the first aspect of the present invention, the pressing spring and the wire locking member are integrally formed.

[0012]

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

(Embodiment 1) Embodiment 1 of the present invention is shown in FIG.
A description will be given based on FIG. In the following description, unless otherwise specified, the description will be made by defining the upper, lower, left, and right directions in the direction shown in FIG.

The electric wire connection terminal 1 comprises a terminal plate 2, a pressing spring 3, an electric wire locking member 4, and a release button 5,
It is stored in the terminal storage chamber 12 of the container 11 made of a synthetic resin molded product. In addition, an electric wire insertion hole 13 for inserting an electric wire into the terminal storage chamber 12 and a release button insertion hole 14 for exposing the release button 5 to the outside are opened on the surface of the housing 11.

The pressing spring 3 is formed by bending a sheet metal made of an elastic material. FIG. 2A is an exploded view of the pressing spring 3. The pressing spring 3 has a rectangular main portion 30, and has an L-shaped first spring portion from both side edges along the longitudinal direction of the main portion 30. (First spring portion) 31 and second spring portion (second
The first and second spring portions 31 and 32 are bent in a direction (downward) substantially orthogonal to the main portion 30. A third spring portion (third spring portion) 33 in the form of a strip is formed from one side edge along the short width direction of the main portion 30.
Are continuously and integrally extended, and a strip-shaped release operation piece 34 is continuously and integrally extended from the opposite side edge.

The first and second spring portions 31 and 32 are substantially L-shaped, and the leading ends of the short-side pieces 31a and 32a are
0 and a piece on the longitudinal side (hereinafter referred to as a spring piece) 31
b and 32b protrude in the same direction (left side) as the direction in which the third spring portion 33 protrudes. In addition, the first and second spring portions 3
The ends of the spring pieces 31b, 32b are bent inward from the middle part in the vertical direction, and a plurality of teeth 31c, 32c projecting from the lower edge of each piece mesh with each other. It has become.

The side edge of the main portion 30 on which the third spring portion 33 is projected is bent upward, and the third spring portion 33 projects from the upper edge in a direction parallel to the main portion 30. The third spring portion 33 is formed in an elongated plate shape, is bent downward near a connection portion with the main portion 30, and has a tip inclined obliquely downward.

The release operation piece 34 is bent upward in the vicinity of the connection portion with the main part 30, and further has a distal end protruding substantially in parallel with the main part 30 toward the opposite side to the main part 30, and has a combined end. A release button 5 made of a resin molded product is attached.

The electric wire locking member 4 has a cross section L having a fixing piece 4a fixed to the lower surface of the main portion 30 by a method such as caulking or welding, and a locking piece 4b projecting downward from one end edge of the fixing piece 4a. The lock piece 4b is formed with an insertion hole 4c for inserting an electric wire.

Here, when the electric wire connection terminal 1 is incorporated into the terminal storage chamber 12 of the housing 11, the pressing spring 3 to which the electric wire locking member 4 is fixed is pushed with the release operation piece 34 side at the top. The release operation piece 34 is inserted into the storage chamber 12, the release operation piece 34 is inserted into the release button insertion hole 14, and the release button 5 is put on the tip of the release operation piece 34 protruding outside from the release button insertion hole 14. Then, the band-shaped terminal plate 2 is inserted into a space surrounded by the first to third spring portions 31 to 33, and the end of the terminal plate 2 is inserted into the insertion hole 4c of the electric wire locking member 4, whereby The installation work ends. The electric wire insertion hole 13 is formed between the terminal plate 2 and the first and second spring portions 31 and 32 when the core wire 61 of the electric wire inserted into the electric wire insertion hole 13 passes through the insertion hole 4c of the locking piece 4b. It is opened at a position where it can be inserted into the gap.

By the way, when the electric wire is not connected to the electric wire connection terminal 1, the pressing spring 3 is inclined downward to the right by its own weight, as shown by the dashed line in FIG. 1 (b). In this state, when the core wire 61 from which the coating of the electric wire is removed is inserted from the electric wire insertion hole 13, the core wire 61 of the electric wire passes through the insertion hole 4 c of the electric wire locking member 4, and the first and second spring portions 31,
32 is inserted into a gap between the spring pieces 31b, 32b and the terminal plate 2. Here, the tip of the third spring portion 33 is the terminal plate 2
Of the first and second spring portions 31 and 32, since the terminal plate 2 is restricted from moving upward by the spring force of the third spring portion 33. The spring pieces 31b and 32b are bent outward by the core wire 61 of the electric wire inserted into the gap between the terminal strip 2 and the spring pieces 31b and 32b by the spring force of the spring pieces 31b and 32b.
The core wire 61 of the electric wire is sandwiched between the terminal plate 2 and the terminal plate 2, and the terminal plate 2 and the core wire 61 are electrically connected. Further, when the terminal plate 2 and the core wire 61 of the electric wire are sandwiched between the spring pieces 31 b and 32 b of the first and second spring parts 31 and 32 and the third spring part 33, the main part 30 of the pressing spring 3 Moves upward, and the pressing spring 3 moves to the position shown by the solid line in FIG.
The locking piece 4b of the electric wire locking member 4 moves upward, and the locking piece 4
Since the edge of the insertion hole 4c provided in the hole b cuts into the core wire 61 of the electric wire, the core wire 61 is prevented from falling off. Therefore, just by inserting the core wire 61 of the electric wire into the electric wire insertion hole 13, the core wire 61 is mechanically held and the terminal plate 2
The electrical connection to is made.

Here, the spring constant of the third spring portion 33 is the first and second spring portions 31, 32 (spring pieces 31b, 32b).
Is set to a value larger than the spring constant of the spring piece 3b in a region where the amount of deflection of the spring pieces 31b and 32b is small.
Only 1b and 32b are bent, and the third spring portion 33 is not bent. On the other hand, when the amount of deflection of the spring pieces 31b, 32b exceeds a predetermined value, the terminal plate 2 is pushed upward against the spring force of the third spring portion 33 by the spring force generated in the spring pieces 31b, 32b. At this time, since the third spring portion 33 is bent upward and the gap between the terminal plate 2 and the spring pieces 31b and 32b is widened, it is possible to suppress an increase in the amount of bending of the spring pieces 31b and 32b. . Thus, the spring pieces 31b, 3
In the region where the amount of deflection of 2b is large, the third spring portion 33 bends, thereby suppressing an increase in the amount of deflection of the spring pieces 31b and 32b, and increasing the local stress applied to the first and second spring portions 31 and 32. Therefore, the core wire 61 having a larger wire diameter can be connected, and the range of the wire diameter connectable to the wire connection terminal 1 can be expanded.

When the electric wire is detached from the electric wire connection terminal 1, when the release button 5 is pressed downward, the lock piece 4b moves downward, and the end of the insertion hole 4c and the core wire 61 are connected. Since the locked state is released, the core wire 61 of the electric wire can be easily pulled out.

(Embodiment 2) FIG. 3 shows Embodiment 2 of the present invention.
This will be described with reference to FIG. In the first embodiment, the pressing spring 3 and the electric wire locking member 4 are separate members. However, in the present embodiment, a locking piece 35 that locks the core of the electric wire continuously and integrally with the pressing spring 3 is formed. Since the configuration other than the pressing spring 3 is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

The electric wire connection terminal 1 comprises a terminal plate 2, a pressing spring 3, and a release button 5, and is accommodated in a terminal accommodating chamber 12 of a vessel 11 made of a synthetic resin molded product.

The pressing spring 3 is formed by bending a sheet metal made of an elastic material. FIG. 4 shows a developed view of the pressing spring 3. The pressing spring 3 has a rectangular main portion 30,
An L-shaped first spring portion 31 and a second spring portion 32 are continuously and integrally extended from both side edges along the longitudinal direction of the main portion 30, and the first and second spring portions 31 and 32 are substantially the same as the main portion 30. It is folded in the direction (downward) perpendicular to it. A strip-shaped third spring portion 33 extends continuously and integrally from one side edge along the short width direction of the main portion 30. Further, a strip-shaped release operation piece 34 is protrudingly provided substantially at the center of the other side edge along the short width direction of the main part 30, and both side pieces 35 b, 35 b of a U-shaped lock piece 35 are provided on both sides. Are connected. As described above, in the present embodiment, the pressing spring 3 and the locking piece 35 are formed from one sheet metal, and the pressing spring 3 and the locking piece 35 are integrally formed to reduce the number of parts. , Assembly workability is improved.

The first and second spring portions 31 and 32 are substantially L-shaped, and the leading ends of the short-side pieces 31a and 32a are
0, and the long side pieces (spring pieces) 31b and 32b protrude in the same direction (left side) as the direction in which the third spring portion 33 protrudes. The spring pieces 31b and 32b of the first and second spring portions 31 and 32 are bent inward from the middle part in the vertical direction toward the inside, and a plurality of spring pieces protrude from the lower edge of each piece. Are engaged with each other.

The third spring portion 33 is formed in an elongated plate shape.
It is bent downward near the connection part with the main part 30, and its tip is inclined obliquely downward.

The release operation piece 34 is bent upward in the vicinity of the connection portion with the main portion 30, and further has a tip projecting substantially in parallel with the main portion 30 toward the opposite side to the main portion 30. A release button 5 made of a resin molded product is attached.

The both side pieces 35b, 35b of the lock piece 35 are bent downward near the connection part with the main part 30, and the core of the electric wire is inserted into the insertion hole 35a opened at the center.

Here, when the electric wire connection terminal 1 is incorporated into the terminal storage chamber 12 of the body 11, the pressing spring 3 is moved to the terminal storage chamber 12 with the release operation piece 34 and the lock piece 35 side at the top.
And the rib 15 provided on the body 11 is inserted into the insertion hole 35a of the lock piece 35, and the release operation piece 34
Is inserted into the release button insertion hole 14, and the release button 5 is put on the tip of the release operation piece 34 protruding outside from the release button insertion hole 14. Then, the band-shaped terminal plate 2 is inserted into the space surrounded by the first to third spring portions 31 to 33, and the end of the terminal plate 2 is inserted into the insertion hole 35 a of the lock piece 35, thereby assembling. Is completed. In addition, the electric wire insertion hole 13 is
Is opened at a position where the core wire of the electric wire inserted into the lock plate 35 is inserted into the gap between the terminal plate 2 and the first and second spring portions 31 and 32 through the insertion hole 35a of the lock piece 35. I have.

By the way, in a state where no electric wire is connected to the electric wire connection terminal 1, as shown by a dashed line in FIG.
The pressing spring 3 is inclined downward to the right by its own weight. In this state, when the core wire from which the coating of the electric wire is removed is inserted from the electric wire insertion hole 13, the core wire of the electric wire passes through the insertion hole 35 a of the locking piece 35, and the spring pieces 31 of the first and second spring portions 31 and 32.
b, 32b and the terminal board 2. Here, the distal end of the third spring portion 33 is in contact with the upper surface of the terminal plate 2 and regulates the upward movement of the terminal plate 2 by the spring force of the third spring portion 33. The spring pieces 31 b, 32 b of the second spring portions 31, 32 and the core pieces of the electric wires inserted into the gaps between the terminal plate 2 and the spring pieces 31 b, 32 b
32b is bent outward, the core of the electric wire is sandwiched between the spring pieces 31b, 32b and the terminal plate 2 by the spring force of the spring pieces 31b, 32b, and the terminal plate 2 and the core wire are electrically connected. . Further, when the terminal plate 2 and the core wire of the electric wire are sandwiched between the spring pieces 31b, 32b of the first and second spring portions 31, 32 and the third spring portion 33, the main portion 30 of the pressing spring 3 is moved. The locking spring 35 moves upward and the pressing spring 3 moves to the position shown by the solid line in FIG. 3, so that the locking piece 35 moves upward, and the end edge of the insertion hole 35 a provided in the locking piece 35 is aligned with the core of the electric wire. The bite prevents the core wire from falling off. Therefore, only by inserting the core wire of the electric wire into the electric wire insertion hole 13, the core wire is mechanically held and the electrical connection to the terminal plate 2 is made.

Here, the spring constant of the third spring portion 33 is the first and second spring portions 31, 32 (spring pieces 31b, 32b).
Is set to a value larger than the spring constant of the spring piece 3b in a region where the amount of deflection of the spring pieces 31b and 32b is small.
Only 1b and 32b are bent, and the third spring portion 33 is not bent. On the other hand, when the amount of bending of the spring pieces 31b, 32b exceeds a predetermined value, the terminal plate 2 is pushed upward against the spring force of the third spring portion 33 by the spring force generated in the spring pieces 31b, 32b. At this time, the third spring portion 33 is bent upward, and the gap between the terminal plate 2 and the spring pieces 31b, 32b is widened, so that an increase in the amount of bending of the spring pieces 31b, 32b can be suppressed. . As described above, in the region where the first and second spring portions 31 and 32 (spring pieces 31b and 32b) have a large amount of deflection, the third spring portion 33 bends, and the spring pieces 3 are thus bent.
Since the increase in the amount of bending of the first and second spring portions 31 and 32 can be suppressed, and the increase in the local stress applied to the spring pieces 31b and 32b of the first and second spring portions 31 and 32 can be suppressed, a core wire having a larger wire diameter is connected. The range of the diameter of the electric wire connectable to the electric wire connection terminal 1 can be expanded.

When the electric wire is removed from the electric wire connection terminal 1, when the release button 5 is pressed downward, the locking piece 35 moves downward, and the chain between the edge of the insertion hole 35a and the core wire is moved. Since the locked state is released, the core wire of the electric wire can be easily pulled out.

(Embodiment 3) FIG. 5 shows Embodiment 3 of the present invention.
This will be described with reference to FIGS. In the second embodiment, the first to third
A lock piece 35 for locking the core wire of the electric wire is provided at a portion different from the spring portions 31 to 33, whereas in the present embodiment, the core wire 61 of the electric wire 60 is locked by the third spring portion 33. Since the electric wire locking member is also used, the number of components is reduced and the assembling workability is improved as in the second embodiment. Since the configuration other than the pressing spring 3 is the same as that of the second embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

The electric wire connection terminal 1 comprises a terminal plate 2, a pressing spring 3, and a release button 5 ', and is housed in a terminal housing chamber 12 of a container 11 made of a synthetic resin molded product.

The pressing spring 3 is formed by bending a sheet metal made of an elastic material. FIG. 7 shows a developed view of the pressing spring 3, which has a rectangular main portion 30.
An L-shaped first spring portion 31 and a second spring portion 32 are continuously and integrally extended from both side edges along the longitudinal direction of the main portion 30, and the first and second spring portions 31 and 32 are substantially the same as the main portion 30. It is folded in the direction (downward) perpendicular to it. A strip-shaped third spring portion 33 extends continuously and integrally from one side edge along the short width direction of the main portion 30. Further, a T-shaped stopper piece 36 is continuously and integrally extended from the other side edge along the short width direction of the main portion 30, and a locking piece 36 a protruding laterally from both side edges of the stopper piece 36. , 36a are projected.

The first and second spring portions 31 and 32 are substantially L-shaped, and the leading ends of the short-side pieces 31a and 32a are
0, and the long side pieces (spring pieces) 31b and 32b protrude in the same direction (left side) as the direction in which the third spring portion 33 protrudes. The spring pieces 31b and 32b of the first and second spring portions 31 and 32 are bent inward from the middle part in the vertical direction toward the inside, and a plurality of spring pieces protrude from the lower edge of each piece. Are engaged with each other.

The third spring portion 33 is formed in an elongated plate shape.
It is bent downward near the connection part with the main part 30, and its tip is inclined obliquely downward.

The release button 5 'is made of a synthetic resin molded product, and is provided in the recess 16 formed on the surface of the body 11 so as to communicate with the release button insertion hole 14 so as to be movable in the left-right direction. A pressing portion 5b movably disposed in the terminal storage chamber 12 in the left-right direction; an operating portion 5a and a pressing portion 5
b.

Here, when assembling the wire connection terminal 1 into the terminal storage chamber 12 of the housing 11, the pressing portion 5 of the release button 5 '
In a state where b is inserted into the terminal storage chamber 12 from the release button insertion hole 14, the operation unit 5 a is arranged in the recess 16,
With the narrow width portion 33a at the tip of the third spring portion 33 inserted into the opening 2a provided in the terminal plate 2, the terminal plate 2 and the pressing spring 3 are inserted into the terminal storage chamber 12, and the terminal plate 2 is mounted. The positioning operation is completed with respect to the body 11. At this time,
The distal end of the pressing portion 5 b of the release button 5 ′ is arranged to face the back surface of the third spring portion 33. In addition, the electric wire insertion hole 13 is such that the core wire 61 of the electric wire 60 inserted into the electric wire insertion hole 13 is
And spring pieces 31b, 32 of the first and second spring portions 31, 32
b. The release button 5 ′ is prevented from falling out by an appropriate method to prevent the release button 5 ′ from falling off from the body 11.

By the way, in a state where the electric wire is not connected to the electric wire connection terminal 1, as shown by a dashed line in FIG.
The pressing spring 3 is inclined downward to the right by its own weight. In this state, when the core wire 61 from which the covering of the electric wire 60 is removed is inserted from the electric wire insertion hole 13, the core wire 6 is inserted into the gap between the spring pieces 31 b and 32 b of the first and second spring portions 31 and 32 and the terminal plate 2.
1 is inserted. Here, the tip of the third spring portion 33 protrudes toward the lower surface side of the terminal plate 2 through the opening 2a, and the core wire 61 is connected to the spring pieces 31b, 31b of the first and second spring portions 31, 32.
32b and the third spring portion 33, the core wire 6
1, the spring pieces 31b, 32b are deflected outward, and the spring pieces 31b, 32b are caused by the spring force of the spring pieces 31b, 32b.
The core wire 61 of the electric wire 60 is sandwiched between the second spring 3b and the third spring portion 33, and the core wire 61 is pressed against the terminal plate 2 by the spring pieces 31b and 32b, so that the terminal plate 2 and the core wire 61 are electrically connected. The third spring part 33 is connected to the core wire 6.
Biting into 1 prevents the core wire 61 from falling off. Therefore, the core wire 61 of the electric wire 60 is inserted into the electric wire insertion hole 13.
Is inserted, the core wire 61 is mechanically held and the electrical connection to the terminal plate 2 is made.

Here, since the spring constant of the third spring portion 33 is set to a value larger than the spring constant of the spring pieces 31b and 32b, the first and second spring portions 31 and 32 (ie, the spring piece 31b). , 32b) in the region where the amount of deflection is small,
Only the spring pieces 31b and 32b are bent, and the third spring portion 33 is not bent. On the other hand, when the amount of deflection of the spring pieces 31b and 32b exceeds a predetermined value, the third spring portion 33 is bent upward by the spring force generated in the spring pieces 31b and 32b, and the third spring portion 33 and the spring piece 31b are bent. , 32b is widened, so that an increase in the amount of deflection of the spring pieces 31b, 32b can be suppressed. Thus, the first and second spring portions 3
In a region where the amount of deflection of the first and second spring pieces 31b and 32b is large, the third spring portion 33 bends, so that the first and second spring pieces 31b and 3b are bent.
2b is suppressed, and the first and second spring portions 3
Since an increase in local stress applied to the spring pieces 31b and 32b of the first and second springs 32 can be suppressed, a core wire having a larger wire diameter can be connected, and the range of the wire diameter connectable to the wire connection terminal 1 is expanded. be able to.

On the other hand, when removing the electric wire from the electric wire connection terminal 1, when the release button 5 'is pressed to the left in FIG. 5, the pressing portion 5b of the release button 5' moves to the left in the drawing, and the pressing portion 5b The third spring portion 33 is pressed to the left in the figure. At this time,
The entirety of the pressing spring 3 tends to move to the left in the drawing by being pressed by the pressing portion 5b, but the locking piece 36a provided on the stopper piece 36 of the pressing spring 3 has a stepped portion (provided on the wall surface of the terminal storage chamber 12). (Not shown), the leftward movement of the pressing spring 3 is regulated.
The spring portion 33 is bent upward, the locked state between the third spring portion 33 and the core wire 61 is released, and the core wire of the electric wire can be easily pulled out.

[0045]

As described above, according to the first aspect of the present invention, a terminal plate formed of a conductive material and a terminal plate formed of an elastic material are pressed between the electric wires and the terminal plate by pressing the electric wires against the terminal plate. A pressure spring for electrically connecting the wire and a wire locking member for locking the wire by cutting into the wire at the tip, the pressing spring being disposed on both sides of the wire to press the wire against the terminal plate; The first and second spring portions are formed continuously and integrally with the two spring portions to urge the two spring portions in a direction approaching the terminal plate, and when the deflection amount of both the spring portions exceeds a predetermined value, the two spring portions and the terminal A third spring portion that bends in a direction in which a distance between the plate and the plate is widened, wherein the pressing spring includes first and second spring portions for pressing an electric wire against the terminal plate, and both springs. , And urges both springs in a direction approaching the terminal plate, The amount of deflection of the spring portion flexes in the direction of spacing widens between the two spring portions and the terminal plate exceeds a predetermined value 3
Since it is composed of three spring portions with the spring portion, the load generated in the pressing spring can be distributed to the three portions,
If the stress limit values of the pressing springs are the same, there is an effect that the range of the wire diameter connectable to the wire connection terminal can be expanded.

According to a second aspect of the present invention, in the first aspect of the present invention, the pressing spring and the wire locking member are integrally formed, and the pressing spring and the wire locking member are integrally formed. Thus, there is an effect that the number of parts can be reduced and labor for assembling work can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B show a wire connection terminal according to a first embodiment, wherein FIG. 1A is a front view, and FIG.

FIG. 2 shows the same as above, (a) is a development view of a pressing spring,
(B) is a development view of an electric wire locking member.

FIG. 3 is a cross-sectional view illustrating a state where the electric wire connection terminal according to the second embodiment is housed in a body.

FIG. 4 is a development view of the pressing spring according to the first embodiment;

FIG. 5 is a cross-sectional view of a state where the electric wire connection terminal according to the third embodiment is housed in a body.

FIG. 6 is a perspective view of a state in which the electric wires are connected to the above, as viewed obliquely from the front.

FIG. 7 is a development view of the pressing spring according to the first embodiment.

FIG. 8 is a cross-sectional view of a switch using a conventional wire connection terminal.

FIG. 9 is a side view of a lock spring constituting the electric wire connection terminal of the above.

FIG. 10 is a diagram showing the relationship between the amount of deflection of the locking spring and the spring load.

[Explanation of symbols]

1 Wire connection terminal 2 Terminal board 3 Press spring 4 Cable lock members 11 Body 12 Terminal storage room 31 1st spring part 32 Second spring part 33 3rd spring part 61 core wire

Claims (2)

[Claims] 1. A terminal plate formed of a conductive material, a pressing spring formed of an elastic material and pressing an electric wire against the terminal plate to electrically connect the electric wire and the terminal plate, and a distal end of the electric wire. A wire locking member for locking the wire by biting into the wire; a first and a second spring portions which are arranged on both sides of the wire and press the wire against the terminal plate, respectively; The two spring portions are formed integrally with the spring portion and urge the two spring portions in a direction approaching the terminal plate, and when the amount of deflection of the two spring portions exceeds a predetermined value, the distance between the two spring portions and the terminal plate is reduced. An electric wire connection terminal, comprising: a third spring portion that flexes in a spreading direction. 2. The electric wire connection terminal according to claim 1, wherein said pressing spring and said electric wire locking member are formed integrally.