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Impact wrench having speed control circuit

  • US 5,526,460 A
  • Filed: 04/25/1994
  • Issued: 06/11/1996
  • Est. Priority Date: 04/25/1994
  • Status: Expired due to Term
First Claim
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1. A variable speed impact wrench having an operator settable maximum speed control to limit the maximum torque applied to a tool bit holder of the wrench, said impact wrench comprising:

  • a motor for driving the tool bit holder;

    a speed control circuit for controlling the speed of said motor;

    a trigger engageable by an operator, said trigger being operably coupled to said speed control circuit to allow said operator to generate a speed control signal in relation to the degree of actuation of said trigger;

    a speed limiting device electrically communicating with said speed control circuit and manually adjustable by said operator for enabling said operator to electrically limit a maximum speed at which said motor can be driven when said trigger is fully engaged.

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