switch

Abstract

The present invention provides a switch capable of reliably contacting contacts with a small load and preventing malfunction. The switch (1) has a plunger (30) and a lower torsion spring (50) that changes according to the direction of movement of the plunger (30). When the plunger (30) is in the operating position, the lower torsion spring (50) The opposite direction of the reset direction exerts force on the plunger (30), and when the plunger (30) is at the reference position, the lower torsion spring (50) exerts force on the plunger (30) in a direction different from the opposite direction of the reset direction.

Description

technical field [0001] The present invention relates to switches. Background technique [0002] Conventionally, among switches that open and close contacts according to the movement of the plunger, a switch having a coil spring for returning the plunger is known. For example, Patent Document 1 discloses an emergency stop switch in which a coil spring is provided below the moving direction of the plunger. [0003] Patent Document 1: Japanese PCT Publication No. 2013-541145 (published on November 7, 2013) [0004] In a normally open switch in which the fixed contact on the side of the switch frame is in contact with the movable contact on the plunger side during operation, in order to make the contacts reliably contact during operation, it is required to make the contacts contact with a specified pressure . However, in the switch described in Patent Document 1, since the coil spring is compressed as the plunger moves, if the plunger movement amount increases, the compressio...

AI Technical Summary

Problems solved by technology

However, if a spring with a small spring constant is used, the contacts are likely to come into contact with each other due to external vibrations, etc., and malfunctions may occur.

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