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Multi-mode drill with mode collar

  • US 8,109,343 B2
  • Filed: 06/29/2011
  • Issued: 02/07/2012
  • Est. Priority Date: 11/21/2007
  • Status: Active Grant
First Claim
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1. A hammer-drill comprising:

  • a housing;

    a motor and a non-rotatable hammer member coupled to the housing;

    a parallel axis transmission coupled to the housing, the parallel axis transmission comprising;

    a spur gear, a high speed gear, and a low speed gear positioned around an intermediate shaft;

    a cooperating high speed gear, a cooperating low speed gear and a rotatable hammer member positioned around an output spindle;

    a manually actuated rotary switch coupled to the housing and movable between a low speed position, a high speed position, and a hammer-drilling position;

    wherein, when the manually actuated rotary switch is in the low speed position, the manually actuated rotary switch is operably coupled to the parallel axis transmission to drivingly couple the motor to the output spindle through the spur gear, the low speed gear, and the cooperating low speed gear while maintaining the non-rotatable hammer member and the rotatable hammer member in a non-contacting spaced-apart relationship;

    wherein, when the manually actuated rotary switch is in the high speed position, the manually actuated rotary switch is operably coupled to the parallel axis transmission to drivingly couple the motor to the output spindle through the spur gear, the high speed gear, and the cooperating high speed gear while maintaining the non-rotatable hammer member and the rotatable hammer member in a non-contacting spaced-apart relationship; and

    wherein, when the manually actuated rotary switch is in the hammer-drilling position, the manually actuated rotary switch is operably coupled to the parallel axis transmission to drivingly couple the motor to the output spindle through the spur gear, the high speed gear, and the cooperating high speed gear while allowing the rotatable hammer member to contact the non-rotatable hammer member to impart axial vibratory impacts to the output spindle;

    wherein axial vibratory impacts are only imparted to the output spindle when the output spindle is drivingly coupled to the motor through the high speed gear and the cooperating high speed gear.

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