JP2006277954A - Disconnecting terminal board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disconnecting terminal board, in which a short-circuit leaf spring integrated with a knob for opening/closing a disconnecting terminal is inserted between a pair of conductive plates or pulled up for closing or opening a circuit, hardly causing false operations, with the less number of operations and scarce contact failure. <P>SOLUTION: In order to change from an open circuit state to a closed circuit state, safety pin holders 9a, b are rotated in a pulling up direction, and a knob 2 for opening/closing a disconnecting terminal is inserted with projected parts of knob safety pins 8a, b and the safety pin holders 9a, b in a non-contact state to realize a closed circuit between the conductive plates 4a, b by the short-circuit leaf spring 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disconnect terminal block that is inserted into a wiring path of a control system and physically disconnects an electric circuit when changing the connection of a wiring or confirming the operation of the system.

  The disconnection terminal block is provided on the external line terminal block in the control panel in order to temporarily shut off the signal supply from, for example, an electromagnetic valve, a small drive electric product, or a detector from the outside.

  FIG. 2 is a diagram illustrating an example of the structure of a conventional disconnect terminal block. 2A shows a closed circuit state in which the electric circuit is connected, and FIG. 2B shows an open circuit state in which the electric circuit is interrupted. In the figure, 1 is a disconnect terminal block, 2 is a disconnect terminal opening / closing knob, 3 is a knob stopper, 4a and b are conductive plates, 5 is a short-circuit leaf spring, 6 is an arm for mounting the disconnect terminal block, and 7a and b are wires. Connection bolts 10 are knob-side sliding surfaces, and 11 is a disconnect terminal fixing side sliding surface.

  A pair of conductive plates 4a and 4b are fixed to the disconnecting terminal block 1 having the disconnecting terminal block mounting arm 6 by wiring connection bolts 7a and 7b. A short-circuit leaf spring 5 is used to electrically connect and disconnect both conductive plates 4a, 4b. The short-circuit leaf spring 5 is integrally attached to the disconnect terminal opening / closing knob 2. When the short-circuit leaf spring 5 is pulled up by moving the disconnect terminal opening / closing knob 2 in the vertical direction in the figure, the two conductive plates 4a and 4b are disconnected, that is, open circuited (FIG. 2 (b)). When the short-circuit leaf spring 5 is inserted, a path is formed between the two conductive plates 4a and 4b, that is, a closed circuit (FIG. 2A).

  The knob stopper 3 is fixed to the disconnecting terminal block 1 and is an upper / lower limit stopper for the vertical movement of the knob 2 and is attached to prevent the knob 2 from being excessively pushed and removed.

  The conventional disconnecting terminal block shown in FIG. 2 prevents the disconnecting terminal opening / closing knob 2 from moving in the insertion direction by the frictional force between the knob side sliding surface 10 and the disconnecting terminal fixing side sliding surface 11. Yes. However, it is impossible to prevent insertion due to human error, and there is a high possibility that the electrical product to be cut off and the control panel are erroneously energized.

As a countermeasure against this problem, for example, there is a technique disclosed in Japanese Patent Laid-Open No. 2001-6475 (Patent Document 1). This is a technique for preventing a circuit from being closed due to a malfunction by hooking a blade for bridging contacts of a terminal block to a window hole.
JP 2001-6475 A

  However, in the technique disclosed in Patent Document 1, although the cover is opened and closed, the blade is rotated and applied to the window hole so that the blade does not bridge the contact, there are many operation procedures. There are problems that the number of operations is large and that a portion where the blade is applied to the window hole may cause contact failure due to wear.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a disconnect terminal block that hardly causes an erroneous operation, has a small number of operations, and does not easily cause a contact failure.

  According to a first aspect of the present invention, a circuit for closing or opening a circuit is provided by inserting or pulling up a short-circuit leaf spring integrally attached to a disconnect terminal opening / closing knob between a pair of conductive plates. In the disconnecting terminal block to be made, a safety pin for the knob installed on the outside of the disconnecting terminal opening / closing knob, having a protruding portion at the tip and rotating around the axis perpendicular to the insertion direction, and the disconnecting A disconnecting terminal block, which is provided on a fixed side of the terminal block, and which is provided with a safety pin stopper that fits the protruding portion of the safety pin for the knob in an open circuit state, thereby preventing the circuit from being closed. It is.

  In the present invention, in the disconnect terminal block that opens or closes the circuit by inserting or pulling up the short-circuit leaf spring integrally attached to the disconnect terminal opening / closing knob between the pair of conductive plates, the safety pin for the knob and Since the safety pin stopper is provided, it is possible to reduce an open circuit state due to an erroneous operation and to reduce the number of operations. Further, since the short-circuiting blade is not applied to the window hole as in Patent Document 1, the short-circuit blade is not worn, and a circuit contact failure is not caused semipermanently.

  Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a diagram showing an example of the structure of a disconnect terminal block according to the present invention. FIG. 1A shows a closed circuit state in which the electric circuit is connected, and FIG. 1B shows an open circuit state in which the electric circuit is interrupted. In the figure, 8a and b are knob safety pins, 9a and b are safety pin stoppers, and the other symbols are the same as those in FIG.

  A pair of knob safety pins 8a and 8b are provided on the outside of the disconnect terminal opening / closing knob 2 so as to rotate about the disconnect terminal opening / closing knob 2 in the insertion / pull-up direction and have a stopper overhang at the tip. . Further, a pair of safety pin stoppers 9a and 9b are provided on the fixed side of the disconnect terminal block, and even if an attempt is made to insert the disconnect terminal opening / closing knob as shown in FIG. The overhanging portions of the knob safety pins 8a and 8b are stopped by the safety pin stoppers 9a and 9b. That is, the disconnecting terminal opening / closing knob 2 is mistakenly inserted from the open circuit state between the conductive plates 4a and 4b so that the shorted plate spring 5 does not enter the closed circuit state between the conductive plates 4a and 4b.

  In order to change from the open circuit state to the closed circuit state, the safety pin stoppers 9a and 9b are rotated in the pulling direction to avoid contact between the protruding portions of the knob safety pins 8a and 8b and the safety pin stoppers 9a and 9b. In this state, the disconnecting terminal opening / closing knob 2 is inserted, and the short circuit leaf spring 5 realizes a closed circuit between the conductive plates 4a and 4b (FIG. 1 (a)).

  On the other hand, in order to change from the closed circuit state to the open circuit state, the disconnecting terminal opening / closing knob 2 is pulled up and the knob safety pins 8a and 8b are rotated around the rotary shaft 12 so that the safety pin stoppers 9a and 9b It is held at the top (FIG. 1 (b)).

  As described above, the number of operations is small. (To make a closed circuit, rotate the safety pin stopper and insert the disconnect terminal opening / closing knob. To open the circuit, pull the disconnect terminal opening / closing knob. The safety pin for the knob is held on the top of the safety pin stopper). Moreover, since it is not hooked by the short-circuiting blade as in Patent Document 1, the short-circuiting blade is not worn, and a circuit contact failure is not caused semipermanently. Furthermore, if the safety pin stoppers 9a and 9b are held at the top during the closed circuit, it is easy to visually determine whether or not the circuit is disconnected depending on the position of the safety pin stopper.

It is a figure which shows an example of the structure of the conventional disconnection terminal block. It is a figure which shows an example of the structure of the disconnection terminal block which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disconnecting terminal block 2 Disconnecting terminal opening / closing knob 3 Knob stopper 4a, b Conductive plate 5 Shorting leaf spring 6 Disconnecting terminal block mounting arm 7a, b Wiring connection bolt 8a, b Safety pin 9a, b Safety pin stopper Tool 10 Knob side sliding surface 11 Disconnect terminal fixed side sliding surface 12 Rotating shaft

Claims (1)

In the disconnecting terminal block that closes or opens the circuit by inserting or pulling up the short-circuiting leaf spring integrally attached to the disconnecting terminal opening / closing knob between the pair of conductive plates,
A safety pin for the knob that is installed outside the disconnect terminal opening / closing knob, has a protruding portion at the tip, and the rear end rotates around an axis perpendicular to the insertion direction;
A disconnection characterized in that it is provided on the fixed side of the disconnection terminal block and is provided with a safety pin stopper that fits the protruding portion of the safety pin for the knob in an open circuit state, thereby preventing the circuit from being closed. Terminal block.

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