JP2015222614A - Terminal part structure, terminal connection part, and circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal part structure capable of sufficiently securing a screw thread for mounting a screw to a terminal part with a simple configuration even when a plate thickness of a terminal plate is decreased.SOLUTION: The terminal part structure is composed of a terminal plate having a hole through which a screw is to be inserted and a washer including a blurring part to be coaxially engaged in the hole of the terminal plate. On an inner surface of the blurring part, a female screw to be screwed with a male screw of the screw is formed.

Description

  The present invention relates to a terminal part structure to which a crimp terminal or the like is connected.

Conventionally, what was described in Unexamined-Japanese-Patent No. 2000-222996 (patent document 1) is known as terminal part structures, such as a circuit breaker.
Patent Document 1 discloses a terminal portion structure for connecting a crimp terminal or the like by performing burring on an upper piece serving as a terminal plate and forming a screw thread on the inner surface of the burring hole. Have been described.

JP 2000-222996 A

In the terminal portion structure described in Patent Document 1, a box-type terminal fitting is used in which an electric wire holding metal is fastened with a terminal screw, thereby connecting and fixing the electric wire with the electric wire holding metal.
In such a box-type terminal fitting, burring is performed on the upper piece screwed with the terminal screw to form a screw thread.
Generally, in the terminal part of the circuit breaker, a screw hole is provided in the base metal. However, in order to reduce the thickness of the terminal plate in order to make the entire circuit breaker compact and lightweight, it is formed on the inner surface of the screw hole. A sufficient number of threads cannot be secured. Therefore, a technique of burring the base metal to secure a thread may be used.
However, since a certain amount of space is required for the burring portion, there is a problem that it is difficult to perform burring processing on the base metal when the size of the terminal portion is small.
In order to deal with such a problem, for example, a structure may be employed in which a nut is disposed on the back side of the terminal plate and a crimp terminal is connected by inserting a screw through the nut.
However, as described above, in order to arrange a nut having a sufficient thread for screwing, there is a new problem that a space is required in the terminal portion structure corresponding to the height of the nut, making compactness difficult. It was.
Therefore, the present invention provides a terminal portion structure that can sufficiently secure a screw thread for attaching a screw to a terminal portion with a simple configuration even when the thickness of the terminal plate is reduced.

  As a configuration for solving the above problems, the terminal part structure of the present invention includes: a terminal plate having a hole through which a screw is inserted; and a washer provided with a burring part that is coaxially inserted into the hole of the terminal plate Thus, an internal thread is formed on the inner surface of the burring portion to be engaged with the external thread of the thread.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the board thickness of a terminal board becomes thin, the terminal part structure which can fully ensure the screw thread for attaching a screw to a terminal part by simple structure can be provided.
Moreover, since the washer used for the terminal part structure of this invention can be manufactured by carrying out sheet metal processing of the plate material, various shapes can be selected and the cost can be reduced.

It is a figure which shows the terminal connection part containing the terminal part structure of this invention. It is the figure which decomposed | disassembled for every component the state before the connection of the terminal connection part of FIG. It is a figure which shows an example of the shape of the washer applied to the terminal part structure of this invention. It is a figure which shows the modification of the shape of the washer applied to the terminal part structure of this invention. It is a figure which shows the modification of the shape of the washer applied to the terminal part structure of this invention. It is a figure which shows the circuit breaker which applied the terminal part structure of this invention to the contact. It is the figure which applied the terminal part structure of this invention to the fixed contact stand of the circuit breaker of FIG. It is a figure which shows the modification of the terminal connection part of the circuit breaker of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
Example 1
FIG. 1 is a diagram showing a terminal part structure of the present invention. FIG. 2 is an exploded view of each part in the state before the connection of the terminal portion structure of FIG.

As shown in FIG. 1, the terminal portion structure 1 of the present invention includes a terminal plate 10 and a washer 20 disposed in combination on the back side of the terminal plate 10, and the terminal plate 10 and the washer 20 are respectively It has a hole through which the screw 40 is inserted (see FIG. 2).
In the terminal portion structure 1 of the present invention, the connection portion 31 of the crimp terminal 30 is overlapped on the surface side of the terminal plate 10, and the terminal plate 10, the washer 20, and the connection portion 31 are integrally screwed together with screws 40. As a result, a terminal connection portion is formed.

As shown in FIG. 2, the terminal plate 10 is formed with a hole 11 through which a burring portion 21 of a washer (described later) and a screw 40 are inserted.
The washer 20 is formed by forming a burring portion 21 and a hole 22 in a thin plate material by burring, and providing an internal thread 23 with an internal thread 23 to be engaged with the external thread 41 of the screw 40.
At this time, the height of the burring portion 21 from the surface of the washer 20 is preferably the same as the thickness of the terminal plate 10.
With such a configuration, the burring portion 21 of the washer 20 does not protrude from the upper surface of the terminal plate 10, and the number of necessary threads can be ensured to the maximum.

In the terminal part structure 1 of the present invention, the connection part 31 of the crimp terminal 30 is arranged on the surface side of the terminal board 10, the hole 32 formed in the connection part 31, the hole 11 of the terminal board 10, and the hole of the washer 20. The terminal 40 is inserted through the screw 40 in a state in which the screw 22 and the screw 22 are aligned, and the male screw 41 of the screw 40 and the female screw 23 of the washer 20 are screwed together to form a terminal connection portion.
According to the terminal connecting portion having such a structure, the number of the female screws 23 formed on the burring portion 21 of the washer 20 can be sufficiently secured. As a result, the crimping terminal 30 and the terminal plate 10 formed by the screws 40 can be secured. A sufficient fastening strength can be secured.

(Modification of Example 1)
3-5 is a figure which shows the modification of the washer 20 applied to the terminal part structure of this invention.
As shown in FIG. 3, the washer 20 is formed by, for example, press punching or the like so as to have a quadrangular outline in a top view.
As shown in FIGS. 4 and 5, the washer 20 may be formed to have a circular shape having the protruding portion 25 or a polygonal shape having the protruding portion 25 in a top view.
In the case of a circular shape in top view, the washer 20 may be rotated together with the screw 40 when the screw is fastened. By adopting these shapes, a convex portion or a wall surface is formed on the base on which the terminal portion structure 1 is arranged. If these are present, these protrusions or the like serve as stoppers and function as detents.
In addition, in FIG. 3, although the case of the top view square was shown, as long as the function of the detent | rotation at the time of screw fastening is fulfilled as mentioned above, it is good also as an arbitrary polygonal thing.
Also, the shape of the protrusion 25 shown in FIGS. 4 and 5 may be any shape such as a cross-sectional triangle, a cross-sectional quadrangle, or a semi-circular cross-section as long as it functions as a detent.

(Example 2)
FIG. 6 is a diagram showing an example in which the terminal portion structure of the present invention is applied as a contact of a circuit breaker.
A circuit breaker 100 shown in FIG. 6 includes a fixed contact base 110, a fixed contact 120 joined to the fixed contact base 110, a movable contact 130 disposed at a position facing the fixed contact 120, and the movable contact. A movable contact base 140 for supporting 130, an arc extinguishing device 150 for extinguishing an arc generated between the two contacts when the current flowing through the circuit is interrupted, and the movable contact base 140 for opening and closing the current. And an opening / closing mechanism 160 to be driven.

The fixed contact stand 110 of FIG. 6 includes, for example, as shown in FIG. 7, two substantially parallel flat portions 114 and 115, a terminal plate 113 having two bent portions, and one flat of the terminal plate 113. A fixed contact 120 joined to the portion 114 and a washer 20 disposed in combination on the back surface side of the other flat portion 115 of the terminal plate 113, and a connecting portion of the crimp terminal 30 on the front surface side of the flat portion 115. The terminal plate 10, the washer 20, and the connecting portion 31 are integrally screwed together with the screw 40 while the 31 is overlapped.
By using the contact structure as shown in FIG. 6 and FIG. 7, it is possible to sufficiently secure the number of the internal threads 23 formed in the burring portion 21 of the washer 20. Sufficient fastening strength with the plate 10 can be ensured.
Further, the wall surface provided on the case or cover of the circuit breaker 100 and the end face or the protruding portion 25 of the washer 20 of the present invention come into contact with each other, so that the washer 20 can be prevented from rotating during the fastening with the screw 40.

(Modification of Example 2)
Further, as shown in FIG. 8, the circuit breaker to which the terminal portion structure of the present invention is applied as a contact is connected from the back side of the fixed contact base 110, that is, the side where the washer 20 is disposed, through the conductive member 170. In this case, the washer 20 is also formed of a conductive metal and functions as a part of the contact.

In addition, this invention is not limited to an above-described Example, Various modifications are included.
For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

For example, in the above-described embodiment, it is shown that the washer 20 is formed of a conductive metal when functioning as a part of the contact. In this case, the terminal plate and the washer are made of the same kind of material. However, for example, the terminal board may be made of an aluminum alloy and the washer may be made of a copper alloy.
Further, the washer can be formed of a material other than metal as long as it is strong enough to be screw-fastened.

  Furthermore, in the above-described embodiment, an example in which the terminal part structure of the present invention is applied to a circuit breaker has been shown. The present invention can also be applied to connecting portions of other electric devices and electronic devices that form the above.

DESCRIPTION OF SYMBOLS 1 Terminal part structure 10 Terminal board 11 Hole 20 Washer 21 Burring part 22 Hole 23 Female screw 30 Crimp terminal 31 Connection part 32 Hole 40 Screw 41 Male screw 100 Circuit breaker 110 Fixed contact stand 120 Fixed contact 130 Movable contact 140 Movable contact stand 150 Arc device 160 Opening / closing mechanism 170 Conductive member

Claims (7)

A terminal portion structure comprising a terminal plate having a hole through which a screw is inserted, and a washer provided with a burring portion that is coaxially inserted into the hole of the terminal plate,
A terminal part structure, wherein an inner thread of the thread is formed on the inner surface of the burring part. The terminal part structure according to claim 1,
The height of the burring portion with respect to the surface of the washer is the same as the thickness of the terminal plate. The terminal part structure according to claim 1 or 2,
The terminal part structure, wherein the washer has a quadrangular shape when viewed from above. The terminal part structure according to claim 1 or 2,
The terminal washer structure characterized in that the washer has a shape having a protrusion on the outer periphery when viewed from above.   The terminal connection part which connected the terminal part structure described in any one of Claims 1-4, and the crimp terminal by the screw coupling between the washer and screw of the said terminal part structure. The terminal connection part according to claim 5,
The terminal connection part, wherein the crimp terminal is electrically connected to the washer through a conductive member. A fixed contact having a fixed contact; a movable contact having a movable contact; an open / close mechanism that opens and closes a contact portion between the fixed contact and the movable contact by driving the movable contact; and the fixed contact and the movable A circuit breaker comprising: an arc extinguishing device that extinguishes an arc generated between the contacts;
The circuit breaker, wherein the fixed contact is formed by the terminal part structure described in any one of claims 1 to 4.

Images