Patent ID: 6377158
Filing Date: 2002-04-23
Classification: H01H

Abstract:
A push button current cut-off safety switch comprising:a housing having an opening; a push button mounted within the housing and being fitted to said opening; a push rod being mounted below said push button and including a triangular passage and an insulating element; a spring being inserted into and compressed by the push rod; an interlinking rod having one end pivotally connected to the housing and the other end being connected to the triangular passage of the push rod; a first conductive plate; a second conductive plate being connected to the first conductive plate by a resilient plate such that the downward movement of the push rod electrically connects to the first and the second conductive plates and the upward movement of the push button disconnects the first and the second conductive plates; an alloy metal made of a shape memory alloy which is thermally deformable, said alloy metal being linked to the second conductive plate and connected to the interlinking rod; a third conductive plate being connected to the second conductive plate by the alloy metal; and whereby when the switch is at a closed circuit state and the current exceeds a predetermined current value, the alloy metal curves upward as a result of elevated temperature, and causes the interlinking rod to drive the insulating element to a position between the third conductive plate and the alloy metal.