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Electric switch with two switching parts acting at different times

  • US 4,286,125 A
  • Filed: 09/06/1979
  • Issued: 08/25/1981
  • Est. Priority Date: 09/07/1978
  • Status: Expired due to Term
First Claim
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1. An electric switch comprising a switch housing having a first chamber, a first contact arm in said housing chamber, bearing means pivotally supporting said first contact arm in said housing, said first contact arm having a first lever arm portion with a first movable contact thereon and an opposite second lever arm portion, a first fixed contact in said housing opposite to said first movable contact in a position to be engaged by said first movable contact when said first contact arm is pivoted, a loading spring mounted in said housing and connected to said first lever arm portion biasing said first lever arm portion in a direction to move said first movable contact into engagement with said first fixed contact, an actuator mounted in said housing for movement and having a first cam portion engageable with said second lever arm portion which in the first position of said actuator holds said first contact arm in a first operating position with said first movable contact spaced away from said first fixed contact, said actuator being movable so that said first cam portion permits rotation of said first contact arm under biasing of said spring to hold said first movable contact in electrical contacting engagement with said first fixed contact, said housing having a second chamber, a second contact arm pivotally mounted in said second chamber and having a first lever arm portion with a second movable contact thereon, said housing having a second fixed contact in said second chamber, said second contact arm having an opposite second lever arm portion, said actuator including a second cam portion engageable with said second lever arm portion of said second contact arm and holding said second lever arm portion of said second contact arm so that said second movable contact is out of engagement with said second fixed contact, a second loading spring connected to said first lever arm portion of said second contact arm, said second cam portion of said actuator permitting faster movement of said second contact arm than said first contact arm so that said second contact arm is moved to engage said second fixed contact with said second movable contact faster than said first movable contact engages said first fixed contact.

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