JP2013008613A - Plug-in connection device of switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug-in connection device of a switch, capable of increasing contact pressure of a clip terminal fitting and improving assemblability thereof.SOLUTION: A plug-in connection device of a switch comprises: a clip terminal fitting which is made of a plate-shape conductive material, has an aperture, and includes a nut arranged in internal space thereof; and a plug-in terminal fitting which is made of a conductive material and plugged in the aperture of the clip terminal fitting so as to be electrically connected. One of the clip terminal fitting and the plug-in terminal fitting is installed on the switch, and the other terminal fitting is connected to a circuit conductor. The plug-in connection device also comprises an auxiliary spring which is attached to the clip terminal fitting, increases contact pressure between the clip terminal fitting and the plug-in terminal fitting, and prevents the nut arranged in the internal space of the clip terminal fitting from falling.

Description

  The present invention relates to an insertion connection device for a switch including a circuit breaker such as a circuit breaker for wiring or an earth leakage circuit breaker, and more particularly to an improvement in contact pressure of the insertion connection device for the switch and an improvement in assembly. It is related with the structure which aims at.

  Conventionally, the connection arrangement means of the circuit breaker that is arranged between the power circuit of the wiring circuit and the load circuit and protects the load circuit from the arrangement point to the load device and the conductor in the distribution board, in particular, in the distribution board As is well known, “front surface type” or “back surface type” is selected and used depending on the facility situation of the conductor.

  However, these “front surface type” or “back surface type” directly connect the load circuit wires or conductors in the switchboard to the circuit breaker. For example, the circuit breaker needs to be replaced. When this occurs, it is easily predicted that a great deal of labor and labor will be required.

  Therefore, an electrical connection between the power supply circuit and the load circuit can be obtained simply by installing a connection means between the terminal block for connection installation in the switchboard and the circuit breaker and inserting the circuit breaker. A “break-in circuit breaker” is widely known.

  That is, as an example, a terminal block is disposed in advance on a panel of a switchboard, and the power supply side and load side conductors are connected to the insertion terminal fitting provided in the terminal block. On the other hand, in the circuit breaker, clip terminal fittings are fixed to the power supply side and load side terminals of the circuit breaker so as to face the insertion terminal fitting. And when installing the circuit breaker, by inserting the clip terminal fitting of the circuit breaker of the circuit breaker into the inserted terminal fitting, the pressure contact force by this clip terminal fitting becomes an electrical connection, and the circuit breaker Is installed between the power circuit of the distribution line and the load circuit.

  In this way, the load circuit is opened and closed by opening and closing the circuit breaker. Generally, this type of circuit breaker is called an insertion type circuit breaker or an insertion circuit breaker. This insertion type circuit breaker, or what is called an insertion circuit breaker, may cause poor contact when the pressure contact force of the clip terminal fitting against the insertion terminal fitting is weak.

In order to solve this problem, a special part is added so that it is possible to identify whether normal electrical contact is maintained in the inserted state (see Patent Document 1) or pressure contact force A connection device that reduces insertion force during insertion while securing the above has been considered (see Patent Document 2).

  In general, in a circuit breaker, the maximum value that can be energized by the circuit breaker is AF (ampere frame), and it is well known that each rated current is determined in this AF. (For example, in the case of 63AF, the rated current is 3A to 63A).

  One of the merits of adopting the above insertion circuit breaker is related to this AF (ampere frame). That is, even if AF is determined, even if the rated current and rated breaking capacity remain indefinite, if only the insertion terminal block is provided, wiring can be performed. Even if there is a change in the rated current due to an increase in load capacity or the like, if it is within the AF range, the replacement work is easy and easy.

  However, the biggest merit is that it is easy to replace, so that it is possible to replace it with a spare part after a circuit breaker has failed or short-circuited, and to quickly resume power supply. Is a point. Therefore, the demand for the main circuit for important circuits or for ships is relatively high.

JP 2004-363066 A JP 2009-123604 A

  The above-mentioned conventional insertion connecting device for a switch, on the other hand, is easy to use, but its electrical contact relies on pressure contact rather than screwing or fixing, so that it is also disclosed in Patent Document 2 described above. Therefore, it is required to secure the pressure contact force and not cause poor contact. This is nothing but to avoid “lifting and igniting” of the contact portion due to the electromagnetic repulsion force caused by the current concentration at the contact point. That is, increasing the pressure at the contact portion leads to an improvement in the current-carrying capacity of the insertion connecting device. However, as the demand for downsizing the outer shape of the circuit breaker and increasing the breaking capacity has increased, clip terminals There is a problem that it is difficult to amplify the pressure at the contact portion with a single metal fitting.

  In addition, the clip terminal fitting is fixed to the circuit breaker terminal using the mounting screw and nut. However, the position of the nut is uncertain during installation, and the nut is easy to drop off. There was a problem.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to increase the contact pressure of the clip terminal fitting and to clip to the circuit breaker terminal when assembling the insertion type circuit breaker. Provided is a switch insertion connection device capable of improving the assembling property of a terminal fitting.

  According to another aspect of the present invention, there is provided a switch insertion device including a clip terminal fitting formed of a plate-like conductive material, having an opening and having a nut disposed in an internal space thereof, and the clip terminal fitting formed of the conductive material. An insertion terminal fitting that is inserted into and electrically connected to the opening of the first terminal, and attaches one of the clip terminal fitting and the insertion terminal fitting to the switch, In a switch insertion connecting device constituted by connecting the terminal fitting to a circuit conductor, the contact fitting is attached to the clip terminal fitting and increases the contact pressure between the clip terminal fitting and the insertion terminal fitting. The auxiliary spring for preventing the nut arranged in the internal space of the clip terminal fitting from falling off is provided.

  According to the switch insertion device according to the present invention, the auxiliary spring attached to the clip terminal fitting increases the contact pressure to the clip terminal fitting and fixes the position of the nut in the clip terminal fitting. Thus, it is possible to obtain a switch insertion device that can improve the assembling property of the clip terminal fitting to the circuit breaker terminal portion during assembly of the insertion type circuit breaker.

It is a side view which shows the state which applied the insertion insertion apparatus of the switch concerning Embodiment 1 of this invention to the switch. It is a top view which shows the connection part of the insertion connection apparatus of the switch concerning Embodiment 1 of this invention. It is a top view which shows the clip terminal metal fitting part in the insertion connection apparatus of the switch concerning Embodiment 1 of this invention. FIG. 3 is a side view showing a clip terminal fitting part in the switch insertion connection device according to Embodiment 1 of the present invention. It is a top view which shows the clip terminal metal fitting part in the insertion connection apparatus of the switch concerning Embodiment 2 of this invention. It is a side view which shows the clip terminal metal fitting part in the insertion connection apparatus of the switch concerning Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. 1, and in each of the drawings, the same or equivalent members and parts will be described with the same reference numerals. FIG. 1 is a side view showing a state in which the switch is applied to an insertion / connection device switch for a switch according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing a connection portion of the switch connection device according to Embodiment 1 of the present invention.
FIG. 3 is a plan view showing a clip terminal fitting part in the switch insertion device according to Embodiment 1 of the present invention. FIG. 4 is a side view showing the clip terminal fitting in the switch insertion device according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the insertion connecting device 11 of the switch 13 includes at least a clip terminal fitting 19 and an insertion terminal fitting 1, and a terminal block depending on the configuration of the insertion connecting device 11. 3 is used. Therefore, the first embodiment of the present invention will be described with a configuration using the terminal block 3.

  In such a configuration, reference numeral 3 denotes a terminal block made of an insulating material such as a synthetic resin. The terminal block 1 is attached in advance, and is fixed to the angle 15 in the switchboard using the mounting screws 16. The At this time, the insertion terminal fitting 1 is screwed to the external conductor 12 on the power supply side and the load side provided in the switchboard by a bolt portion 1b formed at one end of the insertion terminal fitting 1. .

  In addition, 2a is a nut for attaching the terminal fitting 1 to the terminal block 3 via the flange 1c of the insertion terminal fitting 1, and 2b is for attaching the terminal fitting 1 to the external conductor 12. It is a nut.

  A parallel surface contact portion 1 a is formed at the other end of the inserted terminal fitting 1. The switch 13 is attached to the parallel surface contact portion 1a of the inserted terminal fitting 1 by inserting the switch 13 having the clip terminal fitting 19 formed of a plate-like conductive material on the back.

  The clip terminal fitting 19 is attached to the internal conductor 20 of the switch 13 using a mounting screw 21 and a nut 22. The switch 13 is attached to the terminal block 3 by inserting the clip terminal fitting 19 into the parallel surface contact portion 1a and then inserting the attachment screw 18 through the attachment hole 17. .

  In addition, what is shown is a so-called single phase portion, but in the case of three phases, the same shape of the insertion terminal fitting 1 maintains a predetermined inter-electrode dimension in the depth direction on the paper surface of the figure, and three sets are juxtaposed. And fixed to the terminal block 3.

  Next, details of the clip terminal fitting part will be described. The clip terminal fitting 19 is substantially U-shaped, and the opening 19a is displaced by the insertion of the parallel surface contact portion 1a of the insertion terminal fitting 1 to generate contact pressure. Further, an auxiliary spring 23 is provided to prevent the nut 22 disposed in the internal space of the clip terminal fitting 19 from falling off by disposing the U-shaped portion 23 b relative to the both side surface portions 19 c of the clip terminal fitting 19. . The auxiliary spring 23 is substantially U-shaped and is connected to the clip terminal fitting 19 via the parallel surface contact portion 23a, and generates a contact pressure against the displacement of the opening portion 19a as a U-shaped spring facing each other. .

  The nut 22 is located inside the beak shape of the clip terminal fitting 19 and between the parallel surface contact portions 23 a of the auxiliary spring 23, and the positions of the U-shaped inside of the clip terminal fitting 19 and the U-shaped portion 23 b of the auxiliary spring 23. It is fixed to.

  As the circuit breaker external shape is reduced, the entire length of the clip terminal fitting 19 needs to be shortened, and it is difficult to increase the plate thickness of the clip terminal fitting 19 in order to secure the displacement of the opening 19a. For this reason, burring to the clip terminal fitting 19 cannot be performed, and is fixed with the nut 22.

  Next, a process in which the clip terminal portion is attached to the inner conductor 20 of the switch 13 will be described. The mounting screw 21 passes through the inner conductor 20 and the mounting holes 20 a and 19 b of the clip terminal fitting 19 and is screwed with a nut 22. Here, the conditions that can be screwed are that the hole position of the nut 22 is in the coaxial position on the mounting direction axis and that the nut 22 needs to be prevented from rotating. Workability was poor because parts had to be set and aligned.

  In the first embodiment, the nut 22 is located inside the clip terminal fitting 19 and between the parallel surface contact portions 23a of the auxiliary spring 23, and is arranged so as to be opposed to the both side surface portions 19c of the clip terminal fitting 19. The nut 22 is disposed at the position of the U-shaped portion 23b of the spring 23, and the position of the nut 22 is fixed. In addition, the nut 22 can be prevented from falling off.

  As described above, according to the first embodiment, the clip terminal fitting 19 is attached to the clip terminal fitting 19 to increase the contact pressure between the clip terminal fitting 19 and the insertion terminal fitting 1. By providing the auxiliary spring 23 for preventing the nut 22 from being dropped, the contact pressure to the clip terminal fitting 19 is increased, and the position of the nut 22 within the clip terminal fitting 19 is fixed, and the insertion type is inserted. It is possible to obtain a switch insertion device that can improve the assemblability of the clip terminal fitting 19 to the circuit breaker terminal portion during assembly of the circuit breaker.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In the drawings, the same or corresponding members and parts are denoted by the same reference numerals. FIG. 5 is a plan view showing a clip terminal fitting portion in a switch insertion device according to Embodiment 2 of the present invention.
FIG. 6: is a side view which shows the clip terminal metal fitting part in the insertion connection apparatus of the switch concerning Embodiment 2 of this invention.

In the first embodiment described above, the case where a normal hexagonal nut is used as the nut 22 has been described. However, as shown in FIGS. 5 and 6, the nut 24 is formed in a substantially U shape of the clip terminal fitting 19. If the outer shape portion 24a along the U-shaped inclined surface 19d is used, and a screw hole 24b for connection in the axial direction from the end portion is used at the center portion, the detent fixing position is further stabilized, and the screw size In addition, the hole position of the nut 24 can be fixed regardless of the sizes of the clip terminal fitting 19 and the auxiliary spring 23, and the same effect as that of the first embodiment described above can be obtained.

  The present invention relates to a switch insertion connection device capable of increasing the contact pressure of a clip terminal fitting and improving the assembly of the clip terminal fitting to the circuit breaker terminal portion during assembly of the insertion type circuit breaker. It is suitable for realization.

DESCRIPTION OF SYMBOLS 1 Insertion terminal metal fitting 3 Terminal block 11 Insertion terminal connection apparatus 12 External conductor 13 Switch 19 Clip terminal metal fitting 19a Opening part 19c Side part 19d U-shaped slope 20 Inner conductor 22 Nut 23 Auxiliary spring 23a Parallel surface contact part 23b U-shaped part 24 Nut 24a External part

Claims (3)

  A clip terminal fitting formed of a plate-like conductive material, having an opening and having a nut disposed in the internal space, and formed of a conductive material, and inserted into the opening of the clip terminal fitting to be electrically connected. Opening and closing configured with an insertion terminal fitting, with one of the clip terminal fitting and the insertion terminal fitting attached to a switch, and the other terminal fitting connected to a circuit conductor In the insertion connecting device of the container, the nut attached to the clip terminal fitting increases the contact pressure between the clip terminal fitting and the insertion terminal fitting, and the nut arranged in the internal space of the clip terminal fitting. An insertion and connection device for a switch, characterized in that an auxiliary spring for preventing the drop-off is provided.   The auxiliary spring has a U-shaped portion disposed to face both side portions of the clip terminal fitting formed of a plate-shaped conductive material, and is a parallel surface contact connected to the vicinity of the opening of the clip terminal fitting. The switch insertion connection device according to claim 1, wherein a nut disposed in an internal space of the clip terminal fitting is prevented by having a portion.   The clip terminal fitting is formed in a substantially U shape, and an outer peripheral portion of a nut disposed in an internal space of the clip terminal fitting is formed in a shape along the substantially U shape of the clip terminal fitting. The switch insertion connection device according to claim 1 or 2.

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