JP2019096470A - Leaf spring, connection terminal block, manufacturing method of leaf spring - Google Patents

Abstract

To expand pluggable wire size.
An open angle between a free end side section 51 and a fixed end side section 52 when no load is applied is set to be θ1 larger than a predetermined set angle θs. From this initial state, due to plastic deformation of the first bending section 53, the opening angle when no load is applied to the free end section 51 is set to be the set angle θs.
[Selected figure] Figure 8

Description

  The present invention relates to a plate spring, a connection terminal block, and a method of manufacturing a plate spring.

  Patent Document 1 discloses, as a terminal structure for connecting an electric wire to an electric circuit, a push-in terminal which only needs to be inserted into the housing. In this terminal structure, a leaf spring bent in a substantially V shape is used. As the wire is inserted, the plate spring is first pushed by the tip of the wire, and when the end of the wire passes the tip of the plate spring, it shifts to an engaged state in which the wire is pressed by the tip of the plate spring.

Patent No. 5539809 gazette

The elastic deformation of the leaf spring has a proportional area in which the load and the amount of deflection are in proportion, and the size of the proportional area determines the size of the pluggable wire. That is, when the proportional area is narrow, the size of the pluggable wire also becomes smaller.
An object of the present invention is to increase the size of pluggable wires.

  When the wire is inserted into the wire insertion hole of the housing, the plate spring according to one aspect of the present invention engages with the wire inside the housing and suppresses the displacement of the wire in the pulling direction. The position where the electric wire passes inside the housing is the electric wire track, and the tip end projects toward the back side in the insertion direction and the electric wire track, and the plate surface has a linear free end side section arranged to intersect the electric wire track . It comprises a straight fixed end section fixed to the housing and extending parallel to the wire path. A first bending section is interposed between the free end section and the fixed end section, and is bent to a convex side as viewed from the front side in the insertion direction. When the wire is inserted, the tip of the wire pushes the free end section, and when the tip of the wire exceeds the tip of the free end section, the tip of the free end section shifts to the engaged state to push the wire . The opening angle formed by the free end side section and the fixed end side section when no load is applied to the free end side section is set to be larger than a predetermined set angle. From this state, due to plastic deformation of the first bending section, the opening angle when no load is applied to the free end section is set to be the set angle.

  In the method of manufacturing a leaf spring according to one aspect of the present invention, when an electric wire is inserted into the electric wire insertion hole of the housing, the leaf spring engages with the electric wire inside the housing and suppresses the displacement of the electric wire in the pulling direction. Manufacture. The flat spring has a position where the electric wire passes inside the housing as the electric wire path, and the tip end projects toward the back side in the insertion direction and the electric wire path, and the linear free end is disposed so that the plate surface intersects the electric wire path. It has a side section. It comprises a straight fixed end section fixed to the housing and extending parallel to the wire path. A first bending section is interposed between the free end section and the fixed end section, and is bent to a convex side as viewed from the front side in the insertion direction. When the wire is inserted, the tip of the wire pushes the free end section, and when the tip of the wire exceeds the tip of the free end section, the tip of the free end section shifts to the engaged state to push the wire . The first method of forming a leaf spring so that the opening angle between the free end section and the fixed end section when a load does not act on the free end section is larger than a predetermined set angle. Including the steps. After the first step, a load is applied to the free end side section to plastically deform the first bending section, thereby forming the leaf spring so that the opening angle becomes the set angle when the load is removed. Including the steps of

  According to the present invention, the opening angle is made larger than the setting angle, and the opening angle is set to the setting angle by plastic deformation of the first bending section from that state. Work hardening occurs. This work hardening increases the proportional area in the relationship between the load and the amount of deflection, so the size of the pluggable wire can be expanded.

It is a perspective view of a connection terminal block. It is the perspective view of the connection terminal block which showed the inside partially. It is sectional drawing which shows the state before inserting a ferrule terminal. It is sectional drawing of the state which the terminal part contact | abutted to the free end side area of a leaf | plate spring. It is a sectional view in the state where the tip of a terminal area reached the tip of a free end side section. FIG. 7 is a cross-sectional view of a state in which insertion of a ferrule terminal is completed. It is sectional drawing of the state which inserted the tool. It is a figure which shows the manufacturing method etc. of a leaf | plate spring. It is a figure which shows the jig | tool used at a 2nd process. It is a figure which shows the relationship between load and deflection amount.

  Hereinafter, embodiments of the present invention will be described based on the drawings. Each drawing is schematic and may be different from the actual one. In addition, the following embodiments illustrate apparatuses and methods for embodying the technical idea of the present invention, and the configuration is not specified to the following. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

"Constitution"
FIG. 1 is a perspective view of the connection terminal block.
In the following description, three directions orthogonal to one another are referred to as the width direction, the vertical direction, and the depth direction for convenience.
The connection terminal block 11 is a terminal socket for connecting a relay to an external circuit. At one end side in the longitudinal direction, a primary side terminal portion 12 for a coil terminal to which a primary side lead wire can be connected is formed. At the center in the longitudinal direction, for example, a relay terminal portion 13 to which a relay having contacts of four poles can be connected is formed. On the other end side in the vertical direction, there is formed a secondary side terminal portion 14 to which a secondary side lead wire for common terminal, a contact terminal, and b contact terminal can be connected. The primary side terminal portion 12, the relay terminal portion 13, and the secondary side terminal portion 14 are integrated by a housing 15.

In the housing 15, the relay terminal portion 13 is disposed on the rear side in the depth direction with respect to the primary side terminal portion 12 and the secondary side terminal portion 14 on the front side in the depth direction.
The primary side terminal portion 12 has a spring-type terminal structure, and a plurality of wire insertion holes 21 into which lead wires can be inserted along the depth direction are formed on the upper surface of the housing 15. Two wire insertion holes 21c and 21d for one polarity are formed at one end side in the width direction, and two wire insertion holes 21a and 21b for the other polarity are formed at the other end side in the width direction. It is formed. Therefore, there are a total of four wire insertion holes 21 in the primary side terminal portion 12. The two wire insertion holes 21a and 21b or 21c and 21d having the same polarity are arranged to be shifted in both the width direction and the vertical direction. A plurality of tool insertion holes 22 into which tools can be inserted are formed in the top surface of the housing 15 along the depth direction. The tool insertion holes 22 are provided one by one for each of the wire insertion holes 21a to 21d, and are respectively disposed on the other end side in the longitudinal direction than the wire insertion holes 21a to 21d. Therefore, there are a total of four tool insertion holes 22 in the primary side terminal portion 12.

  The relay terminal portion 13 has a plug-in type terminal structure, and a plurality of plug insertion ports 23 into which the plug can be inserted are formed on the top surface of the housing 15 along the depth direction. At one end side in the longitudinal direction, two plug insertion ports 23 for coil terminals are formed. On the other end side in the vertical direction, three plug insertion ports 23 for the common terminal, for the a contact terminal and for the b contact terminal are formed along the vertical direction, and these three are taken as one set, Four groups are arranged along the width direction. Therefore, the relay terminal portion 13 has a total of 14 plug receptacles 23.

  The secondary side terminal portion 14 has a spring-type terminal structure, and a plurality of wire insertion holes 24 corresponding to four poles into which lead wires can be inserted along the depth direction are formed on the upper surface of the housing 15 There is. The secondary side terminal portion 14 has three steps whose heights in the depth direction sequentially decrease from one end side to the other end side in the vertical direction. In the upper stage, for example, two wire insertion holes 24a to 24h are formed per pole for the b contact terminal. In the middle stage, for example, two wire insertion holes 24i to 24p are formed per pole for a contact point terminal. On the lower side, for example, two wire insertion holes 24 q to 24 x are formed per pole for a common terminal. In each stage, two wire insertion holes 24 (for example, 24a and 24b) of one electrode are arranged to be shifted in both the width direction and the longitudinal direction. These six wire insertion holes 24 (for example, 24a, 24b, 24i, 24j, 24q, and 24r) form one set, and four poles are arranged along the width direction. Therefore, there are a total of 24 wire insertion holes 24 in the secondary side terminal portion 14. A plurality of tool insertion holes 25 into which tools can be inserted along the depth direction are formed on the top surface of the housing 15. In each step, one tool insertion hole 25 is provided for each of the wire insertion holes 24a to 24x, and each tool insertion hole 25 is disposed on one end side in the longitudinal direction with respect to the wire insertion hole 24. Therefore, there are a total of 24 tool insertion holes 25 in the secondary side terminal portion 14.

FIG. 2 is a perspective view of the connection terminal block partially showing the inside.
Since the primary side terminal portion 12 and the secondary side terminal portion 14 basically have the same structure, the secondary side terminal portion 14 will be described as an example here.
Inside the housing 15, a blade receiving spring 31 is provided on the back side in the depth direction of each plug insertion port 23. The blade receiving spring 31 is provided with a pair of oppositely biased spring pieces, and holds the inserted plug between the pair of spring pieces. A spring metal fitting 32 is provided on the far side in the depth direction of each of the wire insertion holes 24 a to 24 x, and each spring metal fitting 32 is attached to the intermediate base 46. The spring metal fitting 32 includes a pressing surface 33 substantially parallel to the depth direction and the width direction, and a plate spring 34 biased against the pressing surface 33. The spring fitting 32 is inserted between the pressing surface 33 and the plate spring 34. Sandwich the lead wire. A relay conductive plate 35 for electrically connecting the blade receiving spring 31 and the spring metal fitting 32 is provided on the back side in the depth direction. The relay conductive plate 35 has two systems for coil terminals, and four systems for common terminals, a contact terminals, and b contact terminals.

The ferrule terminal 17 is crimped to the lead wire 16 (electric wire) inserted into the electric wire insertion hole 24. Here, the ferrule terminal 17 inserted into the wire insertion hole 24x of FIG. 1 is shown. The ferrule terminal 17 is a rod-type crimp terminal for preventing wire breakdown and stabilizing the quality of the electrical connection. The ferrule terminal 17 includes an insulated collar portion 18 and a terminal portion 19. A tapered surface 18 a having a smaller diameter toward the tip is formed on the tip end side of the collar 18, and the terminal 19 is thinner than the diameter of the collar 18.
When the lead wire 16 is inserted into the wire insertion hole 24 of the housing 15, the leaf spring 34 engages with the terminal portion 19 inside the housing 15 to suppress the displacement in the pulling direction. Further, when a tool (not shown) is inserted into the tool insertion hole 25, the engagement with the terminal 19 is released inside the housing 15.

Next, the structure of the wire insertion hole 24 will be described.
The wire insertion holes 24 formed in the secondary side terminal portion 14 have the same structure, but here, the wire insertion hole 24 formed in the lower part will be described as an example.
FIG. 3 is a cross-sectional view showing a state before inserting the ferrule terminal.
The wire insertion hole 24 includes a large diameter portion 43, an abutting portion 44, and a small diameter portion 45 in order toward the inside of the housing 15. The diameter of the large diameter portion 43 is slightly larger than the collar portion 18. The contact portion 44 is a tapered surface whose diameter decreases toward the back in the depth direction. The taper angle of the contact portion 44 with respect to the depth direction is larger than the angle of the tapered surface 18 a with respect to the depth direction. The diameter of the small diameter portion 45 is smaller than the diameter of the collar portion 18 and larger than the diameter of the terminal portion 19.

The plate spring 34 is made of, for example, stainless steel, and the plate thickness is about 0.5 mm and uniform. The leaf spring 34 includes a free end section 51, a fixed end section 52, a first bending section 53, a second bending section 54, and a tool contact section 55. A position through which the terminal portion 19 passes inside the housing 15 is referred to as a terminal path 56 (electric wire path).
The free end side section 51 is disposed so that the tip end projects linearly toward the back side in the insertion direction and the terminal track 56, the plate surface is intersected with the terminal track 56, and is biased toward the pressing surface 33. Section. In the state where the ferrule terminal 17 is not inserted, the tip end 51 a of the free end side section 51 is in contact with the pressing surface 33.
The fixed end side section 52 is a straight section fixed to the intermediate base 46 and extending in parallel with the terminal track 56.

The first bending section 53 is a section which is interposed between the free end side section 51 and the fixed end side section 52 and is curved to be convex as viewed from the front side in the insertion direction. If the radius of curvature is too small, plastic deformation is likely to occur and the elastic force is further reduced. Therefore, the radius of curvature is set to be twice or more, preferably three times or more, of the plate thickness. Therefore, it is preferable to set it as the curvature radius of 1.5 mm or more here.
The second bending section 54 is interposed between the free end section 51 and the first bending section 53, and is a section bent on the front side in the insertion direction or on the concave side as viewed from the terminal path 56. is there.
The tool contact section 55 is interposed between the first bending section 53 and the second bending section 54, and is linear which is pushed to the outside of the terminal path 56 by the outer peripheral surface of the tool when the tool is inserted. Section of the

The operation of the plate spring 34 will be described.
FIG. 4 is a cross-sectional view of the state in which the terminal portion is in contact with the free end section of the plate spring.
When the ferrule terminal 17 is inserted into the wire insertion hole 24, first, the terminal portion 19 passes through the small diameter portion 45, and the tip 19a of the terminal portion 19 abuts on the plate surface of the free end section 51 of the plate spring 34. .
When the ferrule terminal 17 is pushed in from this state, the tip 19a of the terminal portion 19 pushes the plate surface of the free end section 51 of the plate spring 34 to the back side in the depth direction. At this time, the range from the free end side section 51 to the tool contact section 55 rotates around the curvature center of the first bending section 53 as a fulcrum, and the degree of opening of the tool contact section 55 with respect to the fixed end side section 52 Of the leaf spring 34 in the closing direction.

FIG. 5 is a cross-sectional view of the state in which the tip of the terminal portion has reached the tip of the free end section.
When the ferrule terminal 17 is further pushed in, the tip 19 a of the terminal portion 19 reaches the tip 51 a of the free end section 51.
When the ferrule terminal 17 is further pushed in and the tip 19a of the terminal portion 19 exceeds the tip 51a of the free end section 51, the terminal section 19 enters so as to cut between the tip 51a of the free end section 51 and the pressing surface 33 Do. At this time, by the elastic force of the plate spring 34, the tip 51 a of the free end side section 51 shifts to an engaged state in which the terminal 19 is pressed against the pressing surface 33.

  Since the free end side section 51 protrudes toward the back side in the insertion direction, in this engaged state, the displacement of the terminal portion 19 in the insertion direction becomes a forward direction, and is permitted. On the other hand, since the displacement in the pullout direction is the reverse direction in which the free end side section 51 is reversed, the tip 51a of the free end side section 51 is caught on the terminal portion 19, and the displacement in the pullout direction is suppressed. Therefore, loosening or falling off of the ferrule terminal 17 can be suppressed. As described above, the terminal portion 19 is held between the end 51 a of the free end side section 51 and the pressing surface 33, whereby the terminal 19 is held in a restraining state. The width dimension of the terminal portion 19 is about 1.5 mm, and the gap between the front end 51a of the free end side section 51 and the pressing surface 33 is equal to the width dimension of the terminal portion 19.

Here, for the sake of convenience, the ferrule terminal 17 is depicted in a non-inclined state, but the terminal 19 is actually pressed by the plate spring 34 toward the pressing surface 33, whereby the ferrule terminal 17 is in the depth direction. It will be in an inclined state. Therefore, when the ferrule terminal 17 is inserted, the diameter of the large diameter portion 43, the taper angle of the contact portion 44, the diameter of the small diameter portion 45, and the like are set to positively allow slight inclination.
FIG. 6 is a cross-sectional view of a state in which insertion of the ferrule terminal is completed.
When the ferrule terminal 17 is further pushed in and the tip end side of the tapered surface 18a of the collar portion 18 abuts on the contact portion 44 of the wire insertion hole 24, further insertion is blocked and stopped. At this time, the tip end 19 a of the terminal portion 19 is set to have a gap with respect to the bottom surface 47 in the housing 15. Here, the length of the collar portion 18 is about 6.0 mm, the length of the terminal portion 19 is about 8.0 mm, and the overall length is about 14.0 mm.

FIG. 7 is a cross-sectional view of a state in which the tool is inserted.
When the leaf spring 34 is engaged with the terminal portion 19, the tool insertion hole 25 is a first bending section from the other end side in the longitudinal direction in the free end side section 51 when viewed from the near side in the depth direction It is disposed at a position overlapping with the area extending to one end side in the longitudinal direction in the direction 53. The tool insertion hole 25 is formed to be inclined by about 10 degrees with respect to the depth direction so as to approach the terminal portion 19 as it goes to the far side in the depth direction. When the leaf spring 34 is engaged with the terminal portion 19, the tool contact section 55 extends substantially parallel to the axis of the tool insertion hole 25. For the tool 61, for example, a minus driver is used.

  When the tool 61 is inserted, the outer peripheral surface of the tool 61 slides in a range from the one end side in the longitudinal direction in the first bending section 53 to the tool contact section 55 while sliding, and the tool contact section 55 to the outside of the terminal portion 19 And push. Alternatively, the tip end of the tool 61 abuts in a range from the other end side in the longitudinal direction in the free end side section 51 to the second bending section 54, and the free end side section 51 is pushed down. Thus, the degree of opening of the tool contact section 55 is narrowed relative to the fixed end section 52 by pushing the tool contact section 55 to the outside of the terminal portion 19 or pushing down the free end section 51, that is, in the closing direction. The leaf spring 34 is elastically deformed. As a result, the engagement between the end 51a of the free end section 51 and the terminal 19 is released, and the terminal 19 is released from being restrained by the plate spring 34, and the ferrule terminal 17 can be pulled out. .

Next, the manufacture of the plate spring 34 will be described.
FIG. 8 is a view showing a method of manufacturing a plate spring and the like.
In the plate spring 34 in the initial state, the opening angle θ1 between the free end side section 51 and the fixed end side section 52 when a load does not act on the free end side section 51 is larger than a predetermined set angle θs It is set to become. The set angle θs is, for example, about 70 degrees. Thereafter, the plastic deformation of the first bending section 53 sets the opening angle when no load is applied to the free end section 51 so as to be the set angle θs, whereby a finished product is obtained.
Next, a method of manufacturing a leaf spring will be described.
In the first step, a leaf spring 34 in an initial state shown by a dotted line is formed. Here, the leaf spring 34 is set so that the opening angle between the free end side section 51 and the fixed end side section 52 when the load does not act on the free end side section 51 is θ1 larger than the set angle θs. To mold.

  In the second step, plastic deformation is applied to form a leaf spring 34 in a completed state shown by a solid line. First, from the initial state, for example, a load is applied to the free end side section 51 by the piston 81, and the load is pushed down to the position indicated by the dashed dotted line. The piston 81 has a hemispherical tip so as not to damage the free end section. Further, a stopper 82 is provided at a position at which the free end side section 51 is stopped so that the free end side section 51 is not pushed downward below the position indicated by the alternate long and short dash line. Thus, when the free end section 51 reaches the position indicated by the alternate long and short dash line, the first bending section 53 exceeds the elastic limit, and plastic deformation in which permanent strain remains even when the load is removed occurs. Therefore, when the load is removed, the position shown by the solid line is restored but the initial position shown by the dotted line is not returned. The tip position of the free end side section 51 when no load is applied is different between the initial state and the completed state, and a difference d of, for example, about 0.2 mm occurs.

FIG. 9 is a view showing a jig used in the second step.
The jig 83 is a hand press, and includes a mount 84 for holding the plate spring 34, and a header 85 which can be advanced and retracted in the vertical direction. A stopper 82 is formed on the upper surface side of the gantry 84. Also, although not shown in the figure, a piston 81 is formed on the back side of the header 85. Therefore, the second step is performed by depressing the header 85 in a state where the plate spring 34 is set to the mount 84.
FIG. 10 is a view showing the relationship between the load and the amount of deflection.
The relation in the initial state is indicated by a dotted line, and the relation in the completed state is indicated by a solid line. The elastic deformation of the leaf spring 34 has a linear proportional area in which the load and the deflection amount are proportional, and in the completed state, the proportional area is longer than in the initial state. This is because the first bending section 53 is work-hardened by plastic deformation and the proof stress is improved. When no load is applied, the tip position of the free end side section 51 has a difference of about 0.2 mm between the initial state and the completed state.

<< Operation >>
Next, main functions of the embodiment will be described.
The pluggable wire size has a certain width, and the minimum size is determined by the maximum current to be supplied, and the maximum size is influenced by the relationship between the load on the leaf spring 34 and the amount of deflection. That is, the elastic deformation of the plate spring 34 has a proportional area in which the load and the amount of deflection are in proportion, and the size of the proportional area determines the size of the pluggable wire. For example, when the proportional area is narrow, the size of the pluggable wire also becomes smaller, which leads to a problem that the producibility of the wire is reduced.

  Therefore, in the first step of manufacturing the leaf spring 34, as an initial state, the opening angle between the free end side section 51 and the fixed end side section 52 when no load is applied is a preset setting angle θs. It is set to be larger than θ1. In the second step, as a completed state, the plastic deformation of the first bending section 53 sets the open angle when no load is applied to the free end section 51 to be the set angle θs. At this time, the first bending section 53 is work-hardened by plastic deformation and the proof stress is improved, so that the proportioned area in the completed state becomes longer than in the initial state. Therefore, the size of the pluggable wire can be expanded, and the producibility of the wire can be improved.

  In the second step, a jig 83 is used. That is, in a state in which the plate spring 34 is set in the mount 84 of the jig 83, a load can be applied to the free end section 51 by the piston 81 by pushing down the header 85. Further, the stand 84 is provided with a stopper 82 at a position at which the free end side section 51 is stopped so that the free end side section 51 is not pushed down more than necessary. Thus, it is possible to prevent plastic deformation from occurring in the first bending section 53 more than necessary, and easily form the uniform leaf spring 34 having a desired spring characteristic with the opening angle set to the set angle θs. it can.

<< Modification >>
In the above embodiment, although the case where the ferrule terminal 17 is crimped to the lead wire 16 has been described, the present invention is not limited to this, and a single wire, a stranded wire, or a bare wire may be used.
In the above embodiment, the c-contact relay in which the a-contact terminal and the b-contact terminal are combined is described. However, the present invention is not limited to this, and can be applied to the a-contact relay and the b-contact relay. Also, although the relay having the four-pole contact has been described, the present invention is not limited to this, and can be applied to a one-pole, two-pole or three-pole relay. Furthermore, the invention is not limited to relays, and can be applied to timers.
In the above embodiment, although the terminal socket for connecting a relay, a timer, etc. to an external circuit was described, it is not limited to this. The point is that any spring-type terminal structure capable of holding the ferrule terminal 17 inserted into the housing 15 can be applied to any other electric devices and accessories.

  Although the foregoing has been described with reference to a limited number of embodiments, the scope of rights is not limited to them, and modifications of the embodiments based on the above disclosure are obvious to those skilled in the art.

  DESCRIPTION OF SYMBOLS 11 ... Connection terminal block, 12 ... Primary side terminal part, 13 ... Relay terminal part, 14 ... Secondary side terminal part, 15 ... Housing, 16 ... Lead wire, 17 ... Ferrule terminal, 18 ... Collar part, 18a ... Taper surface , 19: terminal part, 19a: tip, 21: electric wire insertion hole, 22: tool insertion hole, 23: plug insertion port, 24: electric wire insertion hole, 25: tool insertion hole, 30: angle, 32 ... Spring fitting, 33 ... pressing surface, 34 ... leaf spring, 35 ... relay conductive plate, 43 ... large diameter part, 44 ... contact part, 45 ... small diameter part, 46 ... middle base, 47 ... bottom surface, 51 ... free end Side section, 51a: tip, 52: fixed end section, 53: first bending section, 54: second bending section, 55: tool contact section, 56: terminal path, 61: tool, 81: piston, 82 ... stopper, 83 ... jig, 84 ... mount, 85 ... header

Claims (5)

When a wire is inserted into the wire insertion hole of the housing, the leaf spring is engaged with the wire inside the housing to suppress the displacement of the wire in the pulling direction,
A position where the electric wire passes inside the housing is a wire path, and a tip end projects toward the back side in the insertion direction and the wire path, and a linear free end is disposed so that a plate surface intersects the wire path Side section,
A straight fixed end section fixed to the housing and extending parallel to the wire path;
A first bending section interposed between the free end side section and the fixed end side section and bent to a convex side as viewed from the front side of the insertion direction;
When the wire is inserted, the tip of the wire pushes the free end section, and when the tip of the wire exceeds the tip of the free end section, the tip of the free end section presses the wire Transition to the engaged state,
From the state where the opening angle formed between the free end side section and the fixed end side section when no load is applied to the free end side section is set to be larger than a predetermined setting angle, A leaf spring characterized in that the opening angle when no load is acting on the free end side section is set to the set angle by plastic deformation of one bending section.   Providing a second bending section which is interposed between the free end section and the first bending section and which is bent on the near side of the inserting direction or on the concave side as viewed from the electric wire path; The leaf spring according to claim 1, characterized in that:   The connection terminal block provided with the leaf | plate spring of Claim 1 or 2. When a wire is inserted into a wire insertion hole of a housing, the housing engages with the wire inside the housing to manufacture a plate spring for suppressing displacement of the wire in the drawing direction,
The leaf spring is
A position where the electric wire passes inside the housing is a wire path, and a tip end projects toward the back side in the insertion direction and the wire path, and a linear free end is disposed so that a plate surface intersects the wire path Side section,
A straight fixed end section fixed to the housing and extending parallel to the wire path;
A first bending section interposed between the free end side section and the fixed end side section and bent to a convex side as viewed from the front side of the insertion direction;
When the wire is inserted, the tip of the wire pushes the free end section, and when the tip of the wire exceeds the tip of the free end section, the tip of the free end section presses the wire Transition to the engaged state,
Forming the leaf spring such that an opening angle between the free end side section and the fixed end side section when a load is not applied to the free end side section is larger than a predetermined set angle One step,
After the first step, a load is applied to the free end side section to plastically deform the first bending section so that the opening angle becomes the set angle when the load is removed. And a second step of molding the spring. In the second step,
5. The method according to claim 4, wherein a jig having a stopper for stopping the free end section to which a load is applied at a predetermined position is used.

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