JP2011150845A - Accessory device of breaker for wiring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accessory device of a breaker for wiring which allows easy and reliable internal connection without soldering operation in the connection of a terminal to a printed wiring board. <P>SOLUTION: The accessory device 100 of the breaker for wiring includes a casing 3, a U-shaped terminal 4 fixed to the casing 3 to perform external connection, and a function unit 5 received in the casing which adds a function such as insufficient voltage detection or electric leak detection. The U-shaped terminal 4 has an external connecting surface 4a for external connection and a contact surface 4b formed at the side facing the external connecting surface 4a on which a conductive portion of a printed wiring board 6 that is a part of the function unit 5 abuts. The printed wiring board 6 is fixed to the contact surface 4b by screwing. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an accessory device that is attached to a circuit breaker for protecting a wire of an electric circuit from a short circuit accident and adds a function to the circuit breaker for wiring, and more particularly to simplification of internal wiring of the accessory device.

  In a conventional accessory for a circuit breaker for wiring, a casing made of an insulator, an external connection terminal for connecting an external wiring, and a function that is housed in the casing, such as detecting a leakage, are added to the wiring breaker. It consists of a functional unit, and a lead wire that electrically connects the printed wiring board that is a part of this functional unit and the external connection terminal. Solder is used for electrical connection between the external connection terminal and the lead wire. Attaching is used (for example, refer to Patent Document 1).

  As for the connection method between the external connection terminal and the printed wiring board, one end of the external connection terminal is formed into a pin shape, and a land for inserting one end of the pin shape of the external connection terminal is provided on the printed wiring board. One in which one end of an external connection terminal is inserted and soldering is performed is known (see, for example, Patent Document 2).

JP 2000-149758 A FIG. Japanese Patent Laid-Open No. 7-22094 FIG.

  As described above, in a conventional circuit breaker, when using a lead wire for internal wiring, it is necessary to solder the external connection terminal and the lead wire. There was a problem of requiring storage space.

  Also, in the case of the connection method in which one end of the external connection terminal is inserted into the land of the printed wiring board and soldered, stress tends to concentrate on the soldered part due to rattling of the external connection terminal and solder cracks occur over time. As a result, there is a problem that connection failure may occur.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain an attachment device for a circuit breaker for wiring that enables a simple and reliable internal connection.

  The accessory device for the circuit breaker of the present invention includes a housing formed of an insulating resin, an external connection terminal fixed to the housing for external connection, and a function that is housed in the housing and adds functions. In the accessory device of the circuit breaker composed of the unit, the external connection terminal is connected to the external connection surface for external connection and the conductive circuit of the printed wiring board that is a part of the functional unit on the surface facing the external connection surface. And a conductive surface of the printed wiring board is screwed to the contact surface of the U-shaped terminal with a screw.

  According to the present invention, the external connection terminal includes an external connection surface for external connection, and a contact surface that contacts the conductive portion of the printed wiring board, which is a part of the functional unit, on a surface facing the external connection surface. It has a U-shaped terminal and the conductive part of the printed wiring board is screwed to the contact surface with a screw, so there is no need to use soldering and the printed wiring board and the external connection terminal can be easily connected and fixed. Can do.

It is side surface sectional drawing which shows the attachment apparatus of the circuit breaker for wiring in Embodiment 1 of this invention. It is a principal part enlarged view of the side cross section which shows the attachment apparatus of the circuit breaker for wiring in Embodiment 1 of this invention. It is a perspective view which shows the U-shaped terminal of the attachment apparatus of the circuit breaker for wiring in Embodiment 1 of this invention. It is a side view which shows the U-shaped terminal of the attachment apparatus of the circuit breaker for wiring in Embodiment 1 of this invention. It is a top view which shows the upper surface of the printed wiring board accommodated in the attachment apparatus of the circuit breaker in Embodiment 1 of this invention. It is a disassembled perspective view which shows the attachment apparatus of the circuit breaker for wiring in Embodiment 1 of this invention.

Embodiment 1.
1 is a side sectional view showing an attachment device 100 for a circuit breaker according to Embodiment 1 of the present invention, FIG. 2 is an enlarged view of a main part of a side section of the attachment device 100, and FIG. 3 shows a U-shaped terminal 4. FIG. 4 is a side view showing the U-shaped terminal 4, FIG. 5 is a plan view showing the upper surface of the printed wiring board 6, and FIG. 6 is an exploded perspective view showing the accessory device 100.

  In FIG. 1, an attachment device 100 for a circuit breaker for wiring includes a housing 3 composed of a cover 1 and a base 2, both of which are made of an insulating synthetic resin, and an external connection fixed to the housing 3 for external connection. The U-shaped terminal 4 that is a terminal and the functional unit 5 that is housed in the housing 3 and adds, for example, an undervoltage detection function or a leakage detection function to the wiring breaker. The functional unit 5 includes a printed wiring board 6 having a control circuit 63 such as an undervoltage detection function and a leakage detection function of the accessory device 100, and a power supply unit 7 that supplies control power to the printed wiring board 6. Yes. Further, the cover 1 includes a locking portion 1a disposed so as to be held in a recess 4e (shown in FIG. 4) of the U-shaped terminal 4 when the U-shaped terminal 4 is attached to the cover 1, and And a nut recess 1b having a hexagonal shape so that the nut 12 is not rotated.

  As shown in FIG. 2, the U-shaped terminal 4 has screw fixing portions 6a, 6b, and 6c, which are conductive portions provided on the printed wiring board 6 with terminal fixing screws 8 from the back side of the printed wiring board 6. , 6d (shown in FIG. 5), holes 6a1, 6b1, 6c1, and 6d1 (shown in FIG. 5) are respectively threaded and screwed. When the terminal fixing screw 8 passes through the printed wiring board 6 and is screwed to the U-shaped terminal 4, the printed wiring board 6 is fixed to the cover 1. Also, crimp terminals 11 (illustrated individually as 11a, 11b, and 11c in FIG. 6) of lead wires 10 (illustrated separately as 10a, 10b, and 10c in FIG. 6) for connecting the power supply unit 7 and the printed wiring board 6 are illustrated. Are fastened together with the printed wiring board 6 to the U-shaped terminal 4 by terminal fixing screws 8 (shown individually as 8a, 8b, 8c, and 8d in FIG. 6).

  As shown in FIGS. 3 and 4, the U-shaped terminal 4 has an external connection surface 4a for connecting an external electric wire to one end on the upper surface side by a terminal screw 9, and an external connection surface 5a on the other end on the lower surface side. The contact surface 4b is provided so as to be opposed to perform electrical connection and fixing of the printed wiring board 6 by the terminal fixing screw 8. The external connection surface 4a and the contact surface 4b are substantially parallel to each other. Yes. The external connection surface 4a is provided with a screw hole 4c for screwing the terminal screw 9, and the contact surface 4b is provided with a terminal fixing screw hole 4d for screwing the terminal fixing screw 8. . When the four U-shaped terminals 4 are attached to the cover 1, the contact surfaces 4 b of the four U-shaped terminals 4 are arranged so as to be substantially in the same plane, and the printed wiring board 6 The screwed portions 6a to 6d are in contact with the contact surface 4b of the U-shaped terminal 4, respectively.

  Further, as shown in FIG. 2, the case 1 is provided with a hole 1c for releasing the terminal screw 9 on the surface of the U-shaped terminal 4 where the external connection surface 4a is disposed. The locking part 1a is formed by the part 1c. The U-shaped terminal 4 is formed by screwing a terminal screw 9 for connecting and fixing an external electric wire to the external connection surface 4a of the U-shaped terminal 4 so that the terminal screw 9 and the engaging portion 1a are engaged with each other. The U-shaped terminal 4 is prevented from dropping from 1.

  As shown in FIG. 5, the printed wiring board 6 has screw screw portions 61 a and 61 b that are conductive portions for electrical connection with the U-shaped terminal 4 at one end. The portions 61a and 61b are provided with holes 61a1 and 61b1, respectively. The other end of the printed wiring board 6 has screw screw portions 61c and 61d, which are conductive portions for making electrical connection with the U-shaped terminal 4, and the screw screw portions 61c and 61d include Respective holes 61c1 and 61d1 are provided. Each screwed portion 61a to 61d is provided with a conductive portion on the back surface side of the printed wiring board 6, and the conductive portions on the front and back surfaces are electrically connected to each other by through holes.

  Further, a slit large 62a, which is a first slit, is provided between the screw screw portions 61a and 61b so as to divide the screw screw portion 61a and the screw screw portion 61b. Between the portions 61c and 61d, a large slit 62b, which is also the first slit, is provided so as to divide the screwed portions 61c and 61d.

  Further, the printed wiring board 6 has a narrower width in the direction perpendicular to the cutting direction of the slits 62a and 62b on the inner side of the printed wiring board 6, that is, on the control circuit 63 side than the conductive portions of the screw screw portions 61a to 61d. Slit small portions 64a to 64h, which are two slits, are provided. Specifically, the small slits 64a and 64b are in the vicinity of the screw screw portion 61a, the small slits 64c and 64d are in the vicinity of the screw screw portion 61b, and the small slits 64e and 64f are in the vicinity of the screw screw portion 61c. Small slits 64g and 64h are provided in the vicinity of the attachment portion 61d. Due to the small slits 64a to 64h, the width of the printed wiring board 6 in the slit small portions 64a to 64h is narrower than the width of the conductive portions in the screw screw portions 61a to 61d. Further, in order to connect the output lead wire of the power supply unit 7, a connection portion 65 having a hole 65 a and being a conductive portion is provided in the printed wiring board 6, and the conductor portion of the connection portion 65 is the printed wiring board 6. Are provided on both sides of each other and are electrically connected by through holes.

Next, the assembly procedure of the accessory device 100 will be described with reference to FIG.
First, the U-shaped terminal 4 is inserted into the cover 1 so as to hold the locking portion 1a of the cover 1 in the recess 4e, and the terminal screw 9 is a screw hole provided in the external connection surface 4a of the U-shaped terminal 4. Screw on 4c. Since the terminal screw 9 is locked to the locking portion 1 a of the cover 1 by screwing the terminal screw 9, the U-shaped terminal 4 is not dropped from the cover 1 during the assembly.

  Subsequently, the cover 1 to which the U-shaped terminal 4 is mounted is turned upside down, the nut 12 is inserted into the nut recess 1b of the cover 1, and then the screw screw portions 61a to 61d of the printed wiring board 6 are inserted. The printed wiring board 6 is placed on the contact surface 4b of the U-shaped terminal 4 so that the contact surface 4b comes into contact with the contact surface 4b. Then, the terminal fixing screw 8a is passed through the hole 61c1 of the screw threaded portion 61c from the back surface side of the printed wiring board 6 together with the crimp terminal 11a of the lead wire 10a which is a power input line to the power supply unit 7, and the U-shaped terminal A terminal fixing screw 8a is screwed into a fixing screw hole 4d provided in the abutting surface 4b. Similarly, for the screw screw portion 61d, the terminal fixing screw 8b is inserted into the hole 61d1 of the screw screw portion 61d from the back surface side of the printed wiring board 6 together with the crimp terminal 11b of the lead wire 10b which is a common wire from the power supply unit 7. The terminal fixing screw 8b is screwed into the fixing screw hole 4d provided in the contact surface 4b of the U-shaped terminal 4 so as to penetrate. Further, the terminal fixing screws 8c and 8d are passed through the holes 61a1 and 61b1 of the screw screw portions 61a and 61b from the back surface side of the printed wiring board 6, and the fixing screws provided on the contact surface 4b of the U-shaped terminal 4 Terminal fixing screws 8c and 8d are screwed into the holes 4d.

  According to the procedure described above, the terminal fixing screws 8a, 8b, 8c, and 8d are screwed into the fixing screw holes 4d provided in the contact surface 4b of the U-shaped terminal 4, so that the printed wiring board 6 is connected to the terminal. The lead wires 10a and 10b are connected to the printed wiring board 6 and fixed between the power supply unit 7 and the printed wiring board 6 and between the printed wiring board 6 and the U-shape. The electrical connection between the external connection surfaces 4a of the terminals 4 is completed.

  Next, the wire fixing screw 13 is disposed in the nut recess 1 b of the cover 1 through the hole 65 a of the connection portion 65 of the printed wiring board 6 together with the crimp terminal 11 c of the output lead wire 10 c from the power supply unit 7. Screw onto the nut 12. Subsequently, the projection 7 a of the power supply unit 7 and the engagement recess 1 c of the cover 1 are engaged, and the power supply unit 7 is fitted to the cover 1.

  Finally, the engaging projection 1d of the cover 1 and the hole 2a of the base 2 are engaged so as to house the power supply unit 7, the base 2 is fitted into the cover 1, and the accessory device 100 for the circuit breaker for wiring is installed. Assembly is complete.

  The external connection from the external connection surface 4a of the U-shaped terminal 4 is connected to the U-shaped terminal and the screw threaded portions 61c and 61d of the printed wiring board 6, and through the through holes of the screw threaded portions 61c and 61d. To the lead wires 10a and 10b screwed to the back surface of the printed wiring board 6, respectively. Further, if the terminal fixing screws 8a and 8b are made of a conductive material, the electrical connection between the contact surface 4b of the U-shaped terminal 4 and the lead wires 10a and 10b is also performed via the terminal fixing screws 8a and 8b. Is called.

  According to the present embodiment, the external connection terminal applies the conductive portion of the printed wiring board 6 which is a part of the functional unit 5 to the external connection surface 4a for external connection and the surface facing the external connection surface 4a. Since a U-shaped terminal 4 having a contact surface 4b in contact with the conductive portion of the printed wiring board 6 is screwed to the contact surface 4b with a terminal fixing screw 8, there is no need to use soldering. 6 and external connection terminals can be easily connected and fixed.

  Since the lead wire 10 connecting the functional unit 5 and the U-shaped terminal 4 is screwed together with the printed wiring board 6 to the contact surface 4b by the terminal fixing screw 8, it is not necessary to solder the lead wire 10 for wiring. Can be simplified. If the terminal fixing screw 8 is made of a conductive material, the lead wire 10 and the U-shaped terminal 4 are electrically connected via the terminal fixing screw 8, so that the connection reliability is improved.

  Further, since the contact surface 4b of the U-shaped terminal 4 is arranged in the same plane as the printed wiring board 6, the printed wiring board 6 can be screwed to the U-shaped terminal 4 by the terminal fixing screw 8, and assembly work can be performed. Can improve cost and reduce costs.

  The cover 1 is disposed in the concave portion 4e of the U-shaped terminal 4 and has a locking portion 1a that engages with a terminal screw 9 screwed to the external connection surface 4a. Since the terminal 4 does not fall off from the cover 1 and the assembly becomes easy, the U-shaped terminal 4 and the cover 1 can be firmly fixed.

  Further, after mounting the U-shaped terminal 4 so as to hold the locking portion 1a of the cover 1, the printed wiring board 6 is placed on the U-shaped terminal 4, and the U-shaped terminal fixing screw 8 is mounted. It is possible to assemble from one direction in the order of screwing to the terminal 4, fitting the power supply unit 7 to the cover 1, and fitting the base 2 to the cover 1, thereby facilitating assembly of the accessory device 100.

  Further, even if the cover 1 is distorted or the parallelism or spacing between the external connection surface 4a and the contact surface 4b of the U-shaped terminal 4 varies, the large slit 62 and the small slit 64 provided on the printed wiring board 6 Since the screw threaded portion 61 of the printed wiring board 6 responds, the stress applied to the control circuit 63 of the functional unit 5 can be reduced, and the reliability of the accessory device 100 is improved.

1 cover, 2 base, 3 housing 4 U-shaped terminal, 4a external connection surface, 4b contact surface, 5 functional unit,
6 printed wiring board, 61 screw threaded part, 62 large slit, 64 small slit,
8 terminal fixing screw, 9 terminal screw,
10 Lead wire, 100 Ancillary equipment for circuit breakers.

Claims (5)

Attached to the circuit breaker for wiring composed of a housing formed of insulating resin, an external connection terminal fixed to the housing for external connection, and a functional unit housed in the housing to add functions In the device
The external connection terminal has an external connection surface for external connection, and a U-shape having a contact surface that contacts a conductive portion of a printed wiring board that is a part of the functional unit on a surface facing the external connection surface. An attachment device for a circuit breaker for wiring, wherein the printed circuit board is screwed to the contact surface with a screw. A lead wire connecting the functional unit and the U-shaped terminal is screwed together with the printed wiring board on the surface opposite to the contact surface of the printed wiring board to be electrically connected. The attachment device of the circuit breaker for wiring of Claim 1. The attachment device for a circuit breaker according to claim 1 or 2, wherein the contact surface of the U-shaped terminal is arranged in the same plane as the printed wiring board. The said housing | casing has a latching | locking part arrange | positioned at the recessed part of the said U-shaped terminal, and engages with the screw | thread screwed by the said external connection surface. An accessory device for a circuit breaker according to any one of the preceding claims. The printed wiring board is characterized in that a first slit extending around the conductive portion and a second slit perpendicular to the first slit are provided inside the printed wiring board from the conductive portion. The accessory device of the circuit breaker for wiring of any one of Claim 1 thru | or 4.

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