JP2009295310A - Overcurrent tripping mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overcurrent tripping mechanism in the small number of components capable of obtaining constant time required until an electric path is broken, by installing a structure preventing fear that engagement pieces arranged astride the middle wall of a case are bent toward a case middle wall side as they are press-driven by bending of bimetals and are inhibited from movement by hitting the middle wall of the case. <P>SOLUTION: The overcurrent tripping mechanism provided inside a case of a circuit breaker comprises a plurality of bimetals made of long plates each with one end fixed and the other end free, engagement pieces press-driven by bending of the bimetals, and biasing members biasing movement of the engagement pieces. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an overcurrent tripping mechanism in a circuit breaker.

Conventionally, in a circuit breaker using an overcurrent tripping mechanism, a bimetal provided in the case 51 when an abnormality such as an overcurrent, a short circuit, or a leakage occurs in a main circuit as described in Patent Document 1. 53. The tripping mechanism comprising 53 and the engaging piece 54 is driven to release the pressing of the movable contact by the opening / closing mechanism, and the main circuit is shut off by separating the movable contact from the fixed contact by a spring. There was a circuit breaker.
JP 2004-55173 A

  However, in the invention described in Patent Document 1, when the bimetal is bent and presses the engaging piece arranged across the inner wall of the case, the engaging piece bends to the inner wall side of the case by the force of the bimetal, and the case body There is a disadvantage that the movement of the hooking piece may be worsened. For this reason, even if the bimetal bends due to an overcurrent and presses the engaging piece, extra force is required to press the engaging piece, and there is a possibility that the time until the circuit is interrupted may vary. is there.

  For this reason, the problem to be solved by the present invention is to provide a structure that prevents the engagement piece from being bent when the engagement piece is pressed and driven by the bending of the bimetal and hitting the wall surface of the case, thereby preventing the movement of the engagement piece. Thus, an overcurrent tripping mechanism that provides a constant time required until the electric circuit is interrupted is provided with a small number of components.

  The overcurrent tripping mechanism of the present invention made to solve the above-mentioned problem is an overcurrent tripping mechanism provided inside a case of a circuit breaker, and this overcurrent tripping mechanism is formed from a long plate. And a bimetal in which one end is fixed and the other end is freely provided, a latching piece that is pressed and driven by the curvature of the bimetal, and a biasing member that biases the movement of the latching piece.

  According to the overcurrent tripping mechanism of the present invention, by providing an urging member for not hindering the movement of the engagement piece inside the case, the engagement piece that is pressed and driven by the bending of the bimetal bends and hits the wall surface of the case. It is possible to prevent the possibility of hindering the movement of the engaging piece. Thereby, when an overcurrent flows, it is possible to obtain a constant time until the bimetal is bent to press the engaging piece and the electric circuit is interrupted.

  In the present invention, a structure capable of obtaining a constant time until the electric circuit is interrupted is made possible with a small number of parts.

Embodiments of the present invention will be described below.
An overcurrent tripping mechanism provided inside the case 1 of the circuit breaker, the overcurrent tripping mechanism being formed of a long plate, having one end fixed and the other end being freely provided; The urging force is applied by the bending of the bimetals 3 and 13 and the movement of the engaging pieces 4, 14, 24 and the engaging pieces 4, 14, 24 arranged across the inner walls 2, 12 of the case 1. It consists of members 7, 17, and 27. It is formed in a disk shape at the end of each of the L1 pole foot portions 15 and 25 and the L2 pole foot portions 6, 16 and 26 of the engaging pieces 4, 14 and 24 arranged across the inner walls 2 and 12 of the case 1. By providing the urging members 7, 17, and 27 that can be rotated together, the engagement pieces 4, 14, and 24 are bent by the pressing of the bimetals 3 and 13, and the possibility that the movement may be worsened by hitting the inner walls 2 and 12 is prevented. Is possible. Thereby, when overcurrent flows, it is possible to obtain a constant time until the bimetals 3 and 13 are bent to press the engaging pieces 4, 14 and 24 and the electric circuit is interrupted.

  An overcurrent tripping mechanism provided inside the case of a circuit breaker, the overcurrent tripping mechanism being formed from a long plate and having one end fixed and the other end freely provided, and bimetal bending The engaging piece 34 is configured to be pressed and driven across the inner wall of the case, and an urging member 37 that urges the movement of the engaging piece 34. A bimetal is formed by providing a biasing member 37 that is formed in a disk shape and rotatable in the middle of each of the L1 pole foot portion 35 and the L2 pole foot portion 36 of the engaging piece 34 that is disposed across the inner wall of the case. It is possible to prevent the engagement piece 34 from being bent by the pressing of and the possibility of movement becoming worse by hitting the inner wall. Thereby, when an overcurrent flows, it is possible to obtain a constant time until the bimetal bends and presses the engaging piece 34 to cut off the electric circuit.

  An overcurrent tripping mechanism provided inside the case of a circuit breaker, the overcurrent tripping mechanism being formed from a long plate and having one end fixed and the other end freely provided, and bimetal bending And a latching piece 44 disposed across the inner wall 42 of the case and a biasing member 47 that biases the movement of the latching piece 44. The engaging piece 44 is disposed across the inner wall 42 of the case. The engaging piece 44 is formed in a disk shape on the inner wall 42 with respect to each of the L1 pole foot portion 45 and the L2 pole foot portion 46 of the engaging piece 44 and is rotatable. By providing the member 47 in the upper stage with respect to the L1 pole foot portion 45 and in the lower stage with respect to the L2 pole foot portion 46, the engaging piece 44 is bent by the bimetal pressing, and the movement may be worsened by hitting the inner wall 42. It is possible to prevent. Thereby, when an overcurrent flows, it is possible to obtain a constant time until the bimetal bends and presses the engaging piece 44 and the electric circuit is interrupted.

  An overcurrent tripping mechanism provided inside the case of a circuit breaker, the overcurrent tripping mechanism being formed from a long plate and having one end fixed and the other end freely provided, and bimetal bending The engaging piece 54 is arranged to be pressed and driven across the inner wall of the case, and an urging member 57 that urges the movement of the engaging piece 54. The engaging piece 54 is disposed across the inner wall of the case, and an urging member 57 formed of a substantially hemispherical convex portion is provided on each of the L1 pole 55 foot portion and the L2 pole foot portion 56 of the hook piece 54 on the inner wall side. Even if the engagement piece 54 is bent by the bimetal pressing and hits the inner wall, the biasing member 57 is a substantially hemispherical convex portion, so the area in contact with the inner wall can be reduced. It is possible to prevent a fear that the movement of the piece 54 becomes worse. Thereby, when an overcurrent flows, it is possible to obtain a constant time until the bimetal bends and presses the engaging piece 54 and the electric circuit is interrupted.

  As described above, the overcurrent tripping mechanism of the present invention provides a constant time for the bimetal to bend and press the engaging piece when an overcurrent flows by providing a biasing member inside the case. Is possible.

It is sectional drawing of the overcurrent tripping mechanism in Example 1 of this invention. It is the elements on larger scale seen from A of the overcurrent tripping mechanism in Example 1 of this invention. It is a perspective view of the latching piece which provided the urging member of the overcurrent tripping mechanism in Example 1 of this invention. It is a perspective view of the latching piece which provided the urging member of the overcurrent tripping mechanism in Example 2 of this invention. It is the elements on larger scale of the inner wall which provided the urging member of the overcurrent tripping mechanism in Example 3 of this invention. It is a perspective view of the latching piece which provided the urging member of the overcurrent tripping mechanism in Example 4 of this invention. It is sectional drawing of the overcurrent trip mechanism of patent document 1 in a prior art.

Explanation of symbols

1, 61 Case 2, 12, 42 Middle wall 3, 13, 43, 63 Bimetal 4, 14, 24, 34, 44, 54, 64 Latching piece 15, 25, 35, 45, 55 L1 Pole foot 6, 16 , 26, 36, 46, 56 L2 pole part 7, 17, 27, 37, 47, 57 Biasing member

Claims (1)

  An overcurrent tripping mechanism provided inside a case of a circuit breaker, wherein the overcurrent tripping mechanism is formed of a long plate and has one end fixed and the other end freely provided, and the bimetal An overcurrent tripping mechanism comprising: an engaging piece that is pressed and driven by the bending of the engaging member; and an urging member that urges the movement of the engaging piece.

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