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Power tool safety mechanism

  • US 4,063,600 A
  • Filed: 05/05/1976
  • Issued: 12/20/1977
  • Est. Priority Date: 05/05/1976
  • Status: Expired due to Term
First Claim
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1. In a portable motor driven tool, a motor housing, a motor operatively disposed within said housing, an electrical circuit for said motor, a control switch in said circuit for controlling the supply of electrical power to said motor, a handle for grasping by the user to hold said tool during operation thereof, means connecting said handle to said housing in a manner permitting limited movement of said handle with respect to said housing between first and second positions, a normally-closed switch in said circuit and operatively mechanically connected to said handle and said housing such that said switch is closed when said handle is in said first position and said switch is open when said handle is in said second position, biasing means normally maintaining said handle in said first position, whereby in response to a force acting between said housing and said handle sufficient to overcome said biasing means, said handle is moved to said second position thereby opening said switch to open said electrical circuit for said motor.

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