JP6045978B2 - Transformer terminal block - Google Patents

Description

  The present invention relates to a terminal block of a transformer.

In the terminal block of the transformer that fixes the terminal of the electric connection line, as a method of detachably connecting the electric connection line to the terminal plate (electric conduction plate) provided in the terminal block, for example, shown in Patent Document 1 and Patent Document 2, There has been proposed a method of connecting an electrical connection line to a terminal board using a screw.
In either of Patent Documents 1 and 2, it is necessary to turn a screw when connecting to a terminal plate (electric conduction plate), and the connection of the electrical connection line to the terminal plate cannot be performed with one touch.
For this reason, a screwless terminal block of a type different from the screwed terminal block found in Patent Documents 1 and 2, for example, shown in Patent Document 3 and Patent Document 4, has been proposed.

As shown in FIG. 6 (A), in Patent Document 3 (Japanese Patent Publication No. 11), the end of the stranded wire, that is, the electrical connection wire (not shown) exposed by peeling off the insulating coating from the insertion portion a0 of the casing a. In the locking terminal for connecting an electric wire, the terminal plate b is inserted into the casing a, and the tip of the electric connection line is sandwiched between a leaf spring c (pressing portion) and a terminal plate b (pressed portion). A fuel wire guide surface that is inclined toward the surface b1 (twisted wire receiving surface) and guides the tip of the electrical connection wire into the terminal is provided in the pressing limb c1 of the leaf spring c, and both sides of the stranded wire guiding surface in the pressing limb c1 The lock terminal for electric wire connection which provided the protrusion part which contacts the side surface of the said to-be-pressed part is shown.
Also, as shown in FIG. 6B, in Patent Document 4 (publication FIG. 1), as in FIG. 6A, the tip of the electrical connection line d (electric wire) is inserted into the insertion portion a0 (terminal) of the casing a (housing). It is inserted into the casing a from the insertion port), and the tip of the electrical connection line d is sandwiched between a leaf spring c (plate spring) and a terminal plate b (pressed portion) to make the connection.

Each of the terminal blocks shown in FIGS. 6A and 6B presses the pressing limb c1 along the connection surface b1 at the distal end portion of the electrical connection line d by the insertion of the distal end portion of the electrical connection line d. By this pressing, the pressing limb c1 is bent to widen the gap between the pressing limb c1 and the connection surface b1, and the tip of the pressing limb c1 is bitten by the tip of the electrical connection line d to make an electrical connection. The line d is not retractable.
In the terminal block shown in FIGS. 6 (A) and 6 (B), when the connection is released, the pressing limb c1 is pressed by pressing the release lever e with a tool k such as a screwdriver, and the connection surface b1 of the pressing limb c1. The electrical connection line d can be pulled out.

In the terminal block shown in FIGS. 6 (A) and 6 (B), with respect to the insertion direction x of the electrical connection line d, the clamping of the distal end of the electrical connection line d by the connection surface b1 of the terminal plate b and the leaf spring c is performed by the pressing limb c1. I carry it in one.
As a terminal block of a type different from the terminal block shown in FIGS. 6 (A) and 6 (B), as shown in FIG. 6 (C), the leaf spring c depicted in FIG. One having two pressing limbs, a limb c1 and a second pressing limb c2, has been proposed. In this type, the leaf spring c is substantially U-shaped, and both U-shaped limbs constitute the first pressing limb c1 and the second pressing limb c2.
The second pressing limb c2 is positioned ahead of the first pressing limb c1 in the insertion direction x of the electric connecting line d, that is, in the back of the casing a with respect to the insertion direction x.
In the terminal block of the type shown in FIG. 6 (C), the distal end portion of the electrical connection line d that has penetrated from the first pressing limb c1 into the second pressing limb along the insertion direction x becomes the second pressing limb together with the first pressing limb. The electrical connection line d is more reliably connected to the terminal plate b by being sandwiched.
In the terminal block of the type shown in FIG. 6C, the connecting portion c3 that connects the rear end of the first pressing limb c1 and the rear end of the second pressing limb c2 is such that the leaf spring c of the casing a is connected to the terminal plate b. A straight line extends between the rear end of the first pressing limb c1 and the rear end of the second pressing limb c2 along the restriction surface a1 that restricts the distance from the rear end. That is, the entire surface of the connecting portion c3 facing the side opposite to the connection surface b1 of the terminal plate b is in contact with the restriction surface a1 of the casing a.

Japanese Patent Publication No. 7-60706 Japanese Patent No. 4527577 JP-A-4-4576 Japanese Patent Publication No.59-53667

In the terminal block provided with the two pressing limbs c1 and c2 shown in FIG. 6C, the electrical connection line d tends to be difficult to be inserted as much as it can be reliably fixed. For this reason, as shown in FIG. 6C, the second pressing limb c2 is bent into an S-shape so that it can be compressed and deformed, and the second pressing limb c2 is connected to the connection surface b1 compared to the first pressing limb c1. Some measures have been taken, such as making the waist soft and easy to separate.
The connecting portion of the leaf spring c of the terminal block shown in FIG. 6C receives the force from the first pressing limb c1 and is displaced along the restricting surface a1 in the insertion direction x. The force received from the pressing part c1 does not act on the second pressing limb c2 in the direction away from the connection surface b1.
For this reason, the ease of insertion of the distal end of the electrical connection line d between the distal end of the second pressing limb c2 and the connection surface b1 depends only on the compression deformation of the second pressing limb c2 itself.

The same applies to the surface where the electrical connection line d is smoothly pulled out at the time of release as well as at the time of connection.
That is, when the release rod e is pressed with the tool k, the first pressing limb c1 is pressed by the inclined surface inside the casing a and can be bent in a direction away from the connection surface b1. However, even if the displacement of the connecting portion c3 due to the bending allows the second pressing limb c2 to move along the regulating surface a1, the direction in which the second pressing limb c2 is separated from the connection surface b1. It does not act on. On the contrary, when the release rod e is pressed, it is displaced in the direction approaching the connection surface b1, and the second pressing limb c2 is never easily released.
In this invention, it is a terminal block which can perform the reliable connection to the terminal board of an electrical connection line by one-touch, Comprising: The leaf | plate spring which presses the front-end | tip part of an electrical connection line to a terminal board is electrically connected in a casing For the type having two pressing limbs in the front and back of the line insertion direction, it is possible to smoothly separate the pressing limbs arranged in the back from the terminal plate connection surface, and to solve the above problems. Plan.

The present invention includes a casing having an insertion portion for an electrical connection line, a terminal plate and a leaf spring, each provided in the casing, and the distal end portion of the electrical connection line is inserted into the casing from the insertion portion. Then, a terminal block of a transformer that connects the electrical connection line to the terminal plate by sandwiching the tip end portion of the electrical connection line between the terminal plate and the leaf spring is provided with the following configuration. .
That is, the connection surface of the terminal plate is arranged substantially along the insertion direction of the electrical connection line,
The leaf spring is composed of a first pressing limb, a second pressing limb, and a connecting portion that connects the base ends of the both pressing limbs. The end side is disposed at a position away from the connection surface of the terminal plate, and the tip is directed to the connection surface of the terminal block. The first pressing limb is on the insertion portion side with respect to the second pressing limb. The tip of the first pressing limb is a contact portion and the tip of the second pressing limb is a sub-contact portion, and each of the contact portion and the sub-contact portion is a terminal plate. The connection surface is abutted with or smaller than the thickness of the distal end portion of the electrical connection line, and the connection portion has a contact portion and the second pressing limb more than the contact portion. And a retraction part provided on the side, and the leaf spring is brought into contact with the connection part in the casing. A restricting surface is provided for restricting the terminal plate from moving away from the connection surface, and the contact surface is in contact with the restricting surface, whereby the restricting surface is connected to the terminal plate by the first pressing limb. Restricting movement in a direction away from the surface, the contact portion protrudes more toward the restriction surface than the retracting portion, and due to the protrusion of the contact portion, between the retracting portion and the restriction surface, The gap between the contact portion and the restricting surface is larger than that, and the insertion of the distal end portion of the electrical connection line causes the first pressing limb to move along the connection surface at the distal end portion of the electrical connection line. The connection surface of the terminal plate can be pressed by bending the first pressing limb by the pressing and moving the contact portion in the insertion direction with respect to the base end side of the first pressing limb. Between the connection surface and the contact portion From the contact portion of the tip of the electrical connection line to the tip of the insertion direction, the connecting portion is deformed by receiving a force and between the regulating surface of the retracting portion The distance can be reduced, and the second pressing limb is displaced in a direction away from the connection surface of the terminal plate without being regulated by the regulation surface as compared with the first pressing limb by the deformation of the connecting portion. After the intrusion, the tip of the electrical connection line is further moved in the insertion direction, so that the tip of the electrical connection line smoothly enters between the connection surface and the sub-abutting portion. Can do.
In addition, the transformer here includes not only an ordinary transformer having an iron core but also a transformer without an iron core.
Moreover, this invention is provided with the operation part which can insert operation members, such as a tool, in the said casing, inserts the said operation member in the said operation part, presses the said 1st press limb, and makes the said 1st press limb. By bending, the contact portion is moved in the insertion direction with respect to the base end side of the first pressing limb, and a gap between the contact portion and the connection surface of the terminal plate is enlarged, and the first With the bending of the pressing limb, the abutting portion is drawn toward the proximal end side of the first pressing limb, and the retracting portion is pulled by the abutting portion and deforms to reduce the distance between the regulating surface, Provided is a transformer terminal block that enables smooth pull-out from between the connection surface and the leaf spring at the front end portion of the electrical connection line that has entered.
Furthermore, in the invention of the present application, the connecting portion is connected to the rear end of the first pressing limb, and is extended from the rear end to the rear end side of the second pressing limb with a convex curve with respect to the restriction surface. A first protrusion, and a second protrusion whose one end is connected to the other end of the first protrusion and extends from the other end to the rear end side of the second pressing limb in a convex manner with respect to the restriction surface The other end of the second protrusion is connected to the rear end of the second pressing limb, and the first protrusion protrudes toward the regulating part from the second protrusion. The convex top portion of the first protrusion constitutes the contact portion, the valley portion between the first protrusion and the second protrusion and the second protrusion constitute the retracting portion, and at least, Due to the bending of the first pressing limb due to the pressing of the operating member, the first protrusion is pulled toward the rear end side of the first pressing limb, and the trough between the first protrusion and the second protrusion Previous Are those undulations of the second projection is extended, in the elongation of the undulations, the retracting section provides the transformer terminal block is intended to reduce the spacing between the regulating surface.
Still further, in the present invention, the leaf spring is formed of phosphor bronze, and has a conductive restriction portion and a support portion that supports the restriction portion, and is provided integrally with the terminal plate, and the restriction portion is The restriction portion is provided, and the support portion supports the restriction portion so that the restriction surface is spaced from the connection surface of the terminal plate and faces the connection surface, and the insertion portion of the electrical connection line As a result of the insertion, the electrical connection line is electrically connected directly to the terminal plate, and is electrically connected to the terminal plate from the leaf spring via the restricting portion and the support portion. Provides transformer terminal blocks.

In the invention of the present application, the electrical connection line can be connected to the terminal plate of the terminal block with one touch, and the leaf spring responsible for the connection includes the first and second pressing limbs. Enables smooth connection of electrical connection wires for terminal blocks.
That is, when the connecting portion of the leaf spring is provided with a retracting portion, the pressing to the first pressing limb during insertion of the distal end portion of the electrical connection line between the distal end of the first pressing limb and the connection surface of the terminal plate, The leaf spring connecting portion can be deformed so that the second pressing limb is easily separated from the connection surface regardless of the restriction surface that restricts the movement of the leaf spring in the direction away from the connection surface in the casing. And
Moreover, this invention can cancel | release the said connection of an electrical connection line easily by inserting operation members, such as a tool. In particular, the connection can be smoothly released by the deformation of the connecting portion.
In particular, the present invention uses a force applied to the first pressing limb to separate the second pressing limb from the terminal board, thereby making it possible to smoothly connect and disconnect the electrical connection line. Could provide a terminal block.
In the present invention, the leaf spring is formed of a material suitable for the deformation and the above-described deformation of each part, and the terminal plate is provided with a restriction part that has conductivity and provides the restriction surface. The electrical and physical connection of the electrical connection lines was made possible.

The perspective view which shows the use condition of the terminal block which concerns on this invention, ie, the whole perspective view of the transformer provided with the terminal block which concerns on this invention. (A) is an expansion perspective view of the terminal block of FIG. 1, (B) is a front view of (A). VV sectional drawing of FIG. 2 (B) before an electrical-connection line connection. 2A is a cross-sectional view taken along the line XX in FIG. 2B showing a connection state of the electrical connection line, and FIG. 2B is a cross-sectional view taken along the line XX in FIG. (A) is a front view of the terminal board shown in FIG. 3 (A), (B) is a right side view of the terminal board of (A), (C) is a rear view of the terminal board of (A), and (D) is The front view of the metal fitting shown in Drawing 3 (A), (E) is the right view of (D), and (F) is the rear view of (D). (A) And (B) is a longitudinal cross-sectional view of a conventional terminal block with one type of pressing limb, and (C) is a vertical cross-sectional view of a conventional terminal block with two types of pressing limb.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
For convenience of explanation, in each figure, U indicates the upper side, S indicates the lower side, F indicates the front side, B indicates the rear side, L indicates the left side, and R indicates the right side.
As shown in FIG. 1, a terminal block 100 according to the present invention is provided in a transformer t. In this example, a plurality of terminal blocks 100 are integrally attached to a rail t1 provided in a transformer. Moreover, in the example shown to FIG.1 and FIG.2 (A), the three terminal blocks 100 are united and the terminal unit is formed. In the example shown in FIG. 2B, four terminal blocks 100 are integrated.

As shown in FIG. 3A, each terminal block 100 includes a casing 1, a terminal plate 2 provided with a connection surface 21 for the electrical connection line d (FIG. 4A), and a leaf spring 3. The electrical connection line d can be connected to the terminal plate 2 by inserting the electrical connection line d into the casing 1 and sandwiching it between the connection surface 21 of the terminal plate 2 and the leaf spring 3.
Hereinafter, the configuration of each part of the terminal block 100 will be described in order.

(Casing 1)
The casing 1 is a case formed of an insulating material. In this example, the casing 1 is made of plastic.
As shown in FIG. 3 (A), the casing 1 includes a connection line accommodating portion 11 that accommodates the distal end portion of the electric connection line d, a leaf spring accommodating portion 12 that accommodates the leaf spring 3, and a through hole 13. The rail through hole 14 is provided.
On the front surface of the casing 1, an opening that communicates with the connection line accommodation portion 11 inside the casing 1 is provided as an insertion portion 11 a that inserts the distal end portion of the electrical connection line d into the connection line accommodation portion 11. In this example, as shown in FIG. 2B, two insertion portions 11 a are provided on the front surface of the casing 1, and the distal ends of two parallel electrical connection lines d are inserted into the connection line accommodation portion 11. be able to. However, the number of the insertion portions 11a can be one or three or more. Even if only one insertion portion 11a is provided, a plurality of electrical connection lines d can be inserted into the insertion portion 11a. Moreover, as shown to FIG. 2 (B), also when the casing 1 is provided with the two insertion parts 11a, it can implement as what inserts only one electrical connection line d in any one insertion part 11a.
On the front surface of the casing 1, a front lid 15 is attached below the insertion portion 11a (FIG. 3).

As shown in FIG. 3, the connection line accommodating portion 11 is a space extending in the insertion direction x of the electric connection line d in the casing 1. In this example, the electrical connection line d is inserted into the casing 1 from an insertion portion 11a provided on the front surface of the casing 1, and the insertion direction x is directed from the front F to the rear B.
In the connection line accommodating portion 11, the connection surface 21 of the terminal plate 2 is arranged along the insertion direction x of the electrical connection line d. Specifically, the casing 1 includes a shelf portion 16 that supports the terminal plate 2 with the connection surface 21 being substantially horizontal.

The leaf spring accommodating portion 12 is a room that communicates with the connecting line accommodating portion 11 at a position facing the connecting surface 21 in the casing 1. The leaf spring accommodating portion 12 has a depth direction as a direction away from the connection surface. That is, in this example, as shown in FIG. 3, the leaf spring accommodating portion 12 has the above-described contact position with the connection line accommodating portion 11 as a downward direction and a direction from the contact position upward as a depth direction. The leaf spring accommodating portion 12 includes a back defining surface 12a that defines the depth, a front defining surface 12b that defines the front with the insertion direction x as the front-rear direction, and a rear defining surface 12c that defines the rear.
In this example, the back defining surface 12 a is the top surface of the connection line housing portion 11.
An opening that opens above the insertion portion 11 a on the front surface of the casing 1 and opens to the front defining surface 12 b in the casing 1 is provided as an operation portion 17 in the casing 1.

The through-hole 13 is a hole that penetrates the casing 1 to the left and right as shown in FIGS. A plurality of terminal blocks 100 can be coupled together through a fastener having a seating surface such as a screw or a bolt / nut in the through hole 13.
The rail through hole 14 is a hole having a cross-sectional shape corresponding to the rail t1 and penetrating the casing 1 left and right. As shown in FIGS. 1, 2A and 3, the rail terminal block 100 can be attached to the transformer t by passing the rail t <b> 1 of the transformer t through the rail through hole 14.
The front lid 15 opens and closes the lower portion of the insertion portion 11a on the front surface of the casing 1, and the lower end portion 22 of the terminal board 2 can be exposed by opening the front lid 15 (FIG. 4A).

(Terminal board 2)
As shown in FIGS. 3 and 5B, the main part of the terminal board 2 has a substantially inverted L shape in a side view. In this example, the terminal plate 2 is a metal plate that is a good electrical conductor, and is preferably formed of brass. However, the formation of the terminal plate 2 with a material other than brass is not limited. The upper surface of the inverted L-shaped horizontal portion of the terminal board 2 is the connection surface 21. In this example, two recesses 25 that can be positioned when connecting two electrical connection lines d are extended from the front to the rear on the connection surface 21 (FIGS. 5A and 5C). )).
Moreover, the lower end part 22 of the terminal plate 2 which is reverse L-shaped can be exposed to the exterior of the casing 1 by opening the front cover 15 as above-mentioned (FIG. 4 (A)). Another connecting line (not shown) is connected to the exposed lower end portion 22 by soldering or screws from the direction indicated by the white arrow in FIG.

In this example, as shown in FIG. 3 and FIGS. 5A to 5C, the support portion 23 extending from the right or left side of the connection surface 21 in the depth direction of the leaf spring accommodating portion 12, that is, upward, and the support portion. The terminal plate 2 is integrally provided with the terminal plate 2 and is provided with a restricting portion 24 that is supported by 23 and that provides the inner surface 12 a of the leaf spring accommodating portion 12. The restriction part 24 and the support part 23 are good electrical conductors. The restricting portion 24 and the support portion 23 may be formed integrally with the terminal plate 2 using the same material as the terminal plate 2. However, the restriction portion 24 and the support portion 23 can be formed separately from the terminal plate 2 and fixed to the terminal plate 2 with a fixing tool such as a screw or a bolt.
The depth defining surface 12a of the restricting portion 24 is a surface that faces the connecting surface 22, and is a restricting surface that restricts the leaf spring 3 accommodated in the leaf spring accommodating portion 12 from separating from the connecting surface 22 ( Hereinafter, it will be referred to as a restriction surface 12a as necessary).
However, it is also possible to carry out without providing the restriction part 24 and the support part 23. When the restriction portion 24 is not provided, the casing 1 may be provided with the restriction surface 12a.
However, a support portion 23 and a restriction portion 24 made of a conductive member are provided on the terminal plate 2 in the same manner as the terminal plate 2, and a conductive member can be formed between the restriction surface 12 a of the restriction portion 24 and the connection surface 21 of the terminal plate 2. It is preferable to sandwich the plate spring 3 in that the electrical connection line d and the terminal plate 2 can be more reliably connected electrically and physically.

(Leaf spring 3)
The leaf spring 3 is provided with a resilience that bends when a force is applied and returns to the original shape by eliminating the force. Further, the leaf spring 3 is preferably formed of a good electrical conductor. The leaf spring 3 is preferably formed of a conductive metal, and is particularly preferably formed of phosphor bronze.
As shown in FIG. 3 and FIGS. 5D to 5F, the leaf spring 3 includes a first pressing limb 31, a second pressing limb 32, and base ends 31 b and 32 b of the both pressing limbs 31 and 32. It is comprised with the connection part 33 to connect.
The first and second pressing limbs 31, 32 are arranged at positions where the base ends 31 b, 32 b are separated from the connection surface of the terminal plate 2, that is, closer to the regulation surface 12 a of the spring accommodating portion 12. 31a and 32a are directed to the connection surface 21 of the terminal block.
The distal end portions of the first and second pressing limbs 31 and 32 protrude from the leaf spring accommodating portion 12 into the connecting wire accommodating portion 11. Due to the protrusion, the distal ends 31 a and 32 a are arranged in the connection line housing portion 11.
The first pressing limb 31 is arranged at a distance from the second pressing limb 32 toward the insertion portion 11 a with respect to the second pressing limb 32. In other words, the second pressing portion 32 is arranged at a distance from the first pressing portion 31 in the back of the casing 1 with respect to the insertion direction x of the electrical connection line d, rather than the first pressing portion 31.
The tip 31a of the first pressing limb 31 is the contact portion 31a, the tip 32a of the second pressing limb is the sub-contact portion 32a, and the contact portion 31a and the sub-contact portion 32a are connected to the terminal board 2, respectively. An interval smaller than the thickness of the tip of the electrical connection line is made between the connection surface 21 or the surface 21. In this example, the tip of the first pressing limb 31 and the tip of the second pressing limb 22 are branched by slits 34 and 35 to correspond to the two electrical connection lines d (FIG. 5 ( D) (F)). That is, the first pressing limb 31 includes two left and right contact portions 31 a with the slit 34 interposed therebetween. Further, the second pressing limb 32 includes two left and right auxiliary contact portions 32 a with the slit 35 interposed therebetween.
A broken line part in FIG. 5D shows a reinforcing part of the first pressing limb 31. The reinforcing portion can be formed by embossing the first pressing limb 31.

  The connection part 33 is comprised by the contact part and the retracting part provided in the rear end 32b side of the 2nd press limb 32 rather than the said contact part. When the contact portion comes into contact with the restriction surface 12 a, the restriction surface 12 a restricts the first pressing limb 31 from moving in a direction away from the connection surface 21 of the terminal plate 2. The contact portion protrudes toward the regulation surface 12a from the retracting portion, and the protrusion of the contact portion causes a larger gap between the retracting portion and the regulation surface 12a than between the contact portion and the regulation surface 12a. Yes.

As shown in FIG. 4A, the first pressing limb 31 can be pressed along the connection surface 21 at the distal end portion of the electrical connection line d by inserting the distal end portion of the electrical connection line d into the insertion portion 11a. it can. By the pressing, the first pressing limb 31 can be bent and the contact portion 31 a can be moved in the insertion direction x with respect to the proximal end 31 b side of the first pressing limb 31. And by the said movement, the clearance gap between the connection surfaces 21 of the terminal board 2 is expanded, and it is the insertion direction x rather than the contact part 31a of the electrical connection line d front-end | tip from between the connection surface 21 and the contact part 31a. Allows intrusion to the destination. The connecting portion 33 is deformed by receiving a force and can reduce the distance between the restricting surface 12a of the retracting portion. Due to the deformation of the connecting portion 33, the second pressing limb 32 can be displaced in a direction away from the connection surface 21 of the terminal plate 2 without being regulated by the regulating surface 12 a as compared with the first pressing limb 31, so that the intrusion By further moving the distal end portion of the rear electrical connection line d in the insertion direction x, the distal end portion of the electrical connection line d can smoothly enter between the connection surface 21 and the auxiliary contact portion 32a.
When the invading electrical connection line d tries to retreat, the contact portion 31a contacts the connection surface 21 of the terminal board 2 following the movement in the direction opposite to the insertion direction x with respect to the base end 31b side of the first pressing limb 31. The gap between the portions 31a is narrowed. That is, when the invading electrical connection line d tries to retreat, the contact portion 31a bites into the tip of the electrical connection line d, and the connection surface 21 and the contact portion 31a between the tip of the electrical connection line d once invaded. It is impossible to withdraw from the space.

The leaf spring 2 will be described in more detail. In a state where the leaf spring 2 is housed in the leaf spring housing portion 12, the first pressing limb 31 extends vertically along the front defining surface 12b. The front defining surface 12a restricts the front end side of the first pressing limb 31 from moving forward. Further, the second pressing limb 32 extends vertically along the rear defining surface 12c. The rear defining surface 12c restricts the distal end side of the second pressing limb 32 from moving backward.
The first pressing limb 31 is formed with a guide surface extending from the base side of the first pressing limb 31 to the contact portion 31a with respect to the contact portion 31a. The guide surface is an inclined surface that gradually inclines downward from the front toward the insertion direction x, and guides the tip of the electrical connection line d in the insertion direction x. Further, the second pressing limb 32 is formed with a lucky guide surface extending from the base side of the second pressing limb 32 to the sub abutting portion 32a rather than the sub abutting portion 32a. The auxiliary guide surface is an inclined surface that gradually inclines downward from the front toward the insertion direction x, and guides the distal end of the electrical connection line d in the insertion direction x, similar to the guide surface.
The rear defining surface 12c of the leaf spring accommodating portion 12 is provided with a projecting portion 12d that projects forward from the rear defining surface 12c.
The second pressing limb 32 is provided with a concave curved portion 32c that recedes forward. In the concave curved portion 32c, the second pressing limb 32 bypasses the protruding portion 12d, and the proximity and separation of the second pressing limb 32 from the connection surface 21 is not obstructed by the protruding portion 12d. The auxiliary guide portion of the second pressing limb 32 constitutes a part of the concave curved portion 32c.

  In this example, the connecting portion 33 has one end connected to the rear end 31b of the first pressing limb 31 and is curved convexly with respect to the regulating surface 12a from the rear end 31b to the rear end 32b side of the second pressing limb 32. The first protrusion 33a that extends and one end of the first protrusion 33a is connected to the other end of the first protrusion 33a, and extends from the other end toward the rear end 32b of the second pressing limb 32 in a convex manner with respect to the restriction surface. A second protrusion 33b. The other end of the second protrusion 33 b is connected to the rear end of the second pressing limb 32. About the depth direction of the leaf | plate spring accommodating part 12, the 1st protrusion 33a protrudes to the control part 12a side rather than the 2nd protrusion 33b. In this example, the top of the convex first protrusion 33a constitutes the contact portion, and the valley 33c and the second protrusion 33b between the first protrusion 33a and the second protrusion 33b are retracted. Parts.

(Connection of electrical connection line d)
As shown in FIG. 4A, the first protrusion 33a is pulled toward the rear end 31b of the first pressing limb 31 by the bending of the first pressing limb 31 that moves the contact portion 31a in the insertion direction x. The undulations of the valley 33c and the second protrusion 33b between the first protrusion 33a and the second protrusion 33b are extended. Due to the stretch of the undulations, the retracting portion can reduce the distance between the regulating surface 12a. Due to the deformation of the retracting portion, the second pressing limb 32 smoothly uses the bending of the first pressing limb 2 to smoothly place the distal end portion of the electric connection line d between the auxiliary contact portion 32a and the connection surface 21. Can accept. Further, by compressing the concave curved portion 32c, the tip end portion of the electrical connection line d can be more smoothly introduced between the sub-abutment portion 32a and the connection surface 21.
As shown in FIG. 3, in this example, the connection line is accommodated so that the auxiliary contact portion 32 a of the second pressing limb 32 can also move in the insertion direction x in response to pressing of the distal end portion of the electrical connection portion d. The portion 11 includes an extending portion 11b that extends rearward from the leaf spring accommodating portion 12, that is, ahead in the insertion direction x.

(Disconnecting the electrical connection line d)
When the connection of the electric connection line d is released and the electric connection line d is pulled out from the insertion portion 11a, a tool k such as a screwdriver or other rod-like body is inserted as an operation member from the operation portion 17 in FIG. The first pressing limb 31 is pressed. By the pressing of the operation member, the contact portion 31a of the first pressing limb 31 is moved in the insertion direction x, so that the space between the contact portion 31a and the connection surface 21 is greatly opened. Also due to the bending of the first pressing limb 31, as shown in FIG. 4B, the first protrusion 33a is pulled toward the rear end 31b of the first pressing limb 31, and the first protrusion 33a and the second protrusion The undulations of the valley portion 33c and the second protrusion 33b between 33b are extended, and the retracting portion reduces the distance between the regulating surface 12a by the extension of the undulations. As long as the space between the retracting portion and the regulating surface 12a allows, the reduction is possible, and by the reduction, the auxiliary contact portion 32a of the second pressing limb 32 can be separated from the connection surface 21 upward. it can.
When the operation member is pushed too much, the concave curved portion 32c is caught on the protruding portion 12d and the leaf spring 3 is prevented from rotating.
The operation member may be attached to the casing 1 as a release rod. For example, the operation member may be formed as a release rod accommodated slidably in the operation unit 17. In this case, the operation member may be operated with a fingertip or a separate tool such as a screwdriver.

(Example of change)
The shape of the connecting portion 33 of the leaf spring 3, that is, the configuration of the contact portion and the retracting portion is not limited to the above. For example, the retracting portion may include a separate protrusion having a protrusion width smaller than that of the first protrusion 33a in addition to the second protrusion 33b.
Further, in order to secure the space between the regulating surface 12a and the retracting portion, the regulating portion 12a may be provided with a portion that retreats higher than a portion that contacts the contact portion as a portion corresponding to the retracting portion. it can.
Moreover, if there is no fear that the leaf | plate spring 3 will rotate, it can also implement without providing the said concave curved part 32c and the protrusion part 12d.
As shown in FIGS. 1 and 2A, three terminal blocks 100 are integrally provided, and as shown in FIG. 2B, four terminal blocks 100 are integrally provided. One can be provided on each of the front and rear rails t1, or two can be integrated on one rail t1. Also, five or more terminal blocks 100 can be used as a unit.
Moreover, it can implement also as what integrally molds the several terminal block 100 from the beginning so that separation is impossible.

DESCRIPTION OF SYMBOLS 1 Casing 2 Terminal board 3 Leaf spring 11 Connection line accommodating part 11a Insertion part 12 Leaf spring accommodating part 12a Restriction surface 12b Front regulation surface 12c Rear regulation surface 12d Protrusion part 15 Front cover 16 Shelf part 17 Operation part 21 Connection surface 31 1st Pressing limb 31a Abutting part 31b (first pressing limb 31) rear end 32 Second pressing limb 32a Sub-abutting part 32b (second pressing limb 32) rear end 32c Concave bending part 33 Connecting part 33a First protrusion 33b Second projection 33c Valley 100 Terminal block d Electrical connection line t Transformer x (Electrical connection line d) insertion direction

Claims (4)

A casing having an insertion portion for an electrical connection line; a terminal plate provided in the casing; and a leaf spring; and a terminal portion of the electrical connection line is inserted into the casing from the insertion portion, and the terminal In the terminal block of the transformer that connects the electrical connection line to the terminal plate by sandwiching the tip of the electrical connection line between the plate and the plate spring,
The connection surface of the terminal plate is disposed substantially along the insertion direction of the electrical connection line,
The leaf spring is composed of a first pressing limb, a second pressing limb, and a connecting portion that connects the base ends of the both pressing limbs,
Each of the first and second pressing limbs is arranged such that the base end side is disposed at a position away from the connection surface of the terminal plate and the distal end is directed to the connection surface of the terminal block. The limb is arranged at an interval toward the insertion portion with respect to the second pressing limb,
The tip of the first pressing limb is the contact portion and the tip of the second pressing limb is the sub-contact portion, and each of the contact portion and the sub-contact portion is in contact with the connection surface of the terminal board or An interval smaller than the thickness of the tip of the electrical connection line is opened between the connection surface,
The connecting portion is composed of a contact portion and a retracting portion provided on the second pressing limb side with respect to the contact portion,
In the casing, a regulation surface is provided that regulates movement of the leaf spring in a direction away from the connection surface of the terminal plate by contacting the connecting portion,
When the contact portion abuts on the restriction surface, the restriction surface restricts the first pressing limb from moving away from the connection surface of the terminal plate,
The abutting portion protrudes toward the regulation surface with respect to the retracting portion, and the projection of the abutting portion causes a larger distance between the retracting portion and the regulating surface than between the abutting portion and the regulating surface. Is opened,
By the insertion of the distal end portion of the electrical connection line, the first pressing limb can be pressed along the connection surface at the distal end portion of the electrical connection line, and the first pressing limb is bent by the pressing. Further, the contact portion is moved in the insertion direction with respect to the base end side of the first pressing limb to enlarge a gap between the connection surface of the terminal plate and the connection surface and the contact portion. Allowing entry into the tip of the insertion direction from the contact portion of the electrical connection wire tip from between
The connecting portion can be deformed by receiving a force to reduce the distance between the retraction portion and the restricting surface, and the deformation of the connecting portion causes the second pressing limb to be the first It can be displaced in a direction away from the connection surface of the terminal plate without being regulated by the regulation surface compared to the pressing limb, and by further moving the tip of the electrical connection line in the insertion direction after the entry, A terminal block of a transformer, characterized in that the front end portion of the electrical connection line can smoothly enter between a connection surface and the sub-abutting portion. An operation unit capable of inserting an operation member such as a tool into the casing;
The operation member is inserted into the operation portion, and the first pressing limb is pressed to bend the first pressing limb, whereby the contact portion is moved in the insertion direction with respect to the proximal end side of the first pressing limb. The gap between the contact portion and the connection surface of the terminal plate is enlarged, and the contact portion is drawn toward the proximal end side of the first pressing limb with the bending of the first pressing limb, and the retraction is performed. The portion is pulled and deformed by the abutting portion to reduce the distance between the regulating surface and the front end portion of the invading electrical connection line can be smoothly pulled out from between the connection surface and the leaf spring. The transformer terminal block according to claim 1, wherein: The connecting part has one end connected to the rear end of the first pressing limb, the first projecting part extending from the rear end to the rear end side of the second pressing limb in a convex shape with respect to the restriction surface, and one end A second protrusion that is connected to the other end of the first protrusion and extends from the other end to the rear end side of the second pressing limb in a convex manner with respect to the restriction surface,
The other end of the second protrusion is connected to the rear end of the second pressing limb, and the first protrusion protrudes closer to the regulating part than the second protrusion, and has a convex shape. The top portion of the first protrusion constitutes the contact portion, the valley portion between the first protrusion and the second protrusion and the second protrusion constitute the retracting portion,
At least by the bending of the first pressing limb due to the pressing of the operation member, the first protrusion is pulled toward the rear end side of the first pressing limb, and the valley between the first protrusion and the second protrusion. And the undulation of the second protrusion is extended,
3. The transformer terminal block according to claim 2, wherein the retracting portion reduces the distance between the restriction surface and the undulation. The leaf spring is formed of phosphor bronze,
A restricting portion having conductivity and a support portion supporting the restricting portion are provided integrally with the terminal plate,
The restricting portion includes the restricting surface, and the support portion supports the restricting portion such that the restricting surface is spaced from the connecting surface of the terminal plate and faces the connecting surface,
By the insertion of the electrical connection line into the insertion portion, the electrical connection line is electrically connected directly to the terminal plate, and the terminal spring is electrically connected to the terminal plate via the restriction portion and the support portion. The transformer terminal block according to claim 1, wherein the transformer terminal block is connected to each other.

Images