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Mechanism in a powered hand-held rotary driver for counteracting reaction torque

  • US 5,354,246 A
  • Filed: 03/01/1993
  • Issued: 10/11/1994
  • Est. Priority Date: 02/11/1991
  • Status: Expired due to Fees
First Claim
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1. In a hand operated rotary power tool having a housing, a mechanism for counteracting reaction torque that would otherwise be exhibited directly on the housing, said mechanism comprising:

  • a powered rotor rotatable on a defined axis with respect to the housing;

    a planetary differential mechanism including a ring gear rotatably supported from the housing, a sun gear rotatably supported from the housing being coaxial with said rotor, and a set of planetary gears coacting with both said sun gear and said ring gear, said sun gear being rotatably driven by said rotor;

    an output coaxial with both said rotor and said sun gear and drivingly coupled to said set of planetary gears so as to be rotatably driven thereby;

    a shaft rotatably supported from the housing on an axis that is laterally offset from the axis of said rotor, said ring gear being drivingly coupled to said laterally offset shaft; and

    means for inhibiting rotation of said laterally offset shaft relative to the housing in the direction that said output rotates relative to the housing.

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