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Power tools

  • US 8,747,036 B2
  • Filed: 03/18/2011
  • Issued: 06/10/2014
  • Est. Priority Date: 03/19/2010
  • Status: Active Grant
First Claim
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1. A power tool comprising:

  • a drive unit having a housing and a spindle and configured to rotatably drive the spindle, the spindle being configured to be able to attach a tool bit used for machining a workpiece, the housing having an outer circumferential surface; and

    a base configured to be placed on the workpiece, the base having a base plate configured to contact the workpiece and a tubular holding portion extending from the base plate and positioned to be opposed to the outer circumferential surface of the housing;

    a relative position adjusting mechanism configured to adjust a position of the drive unit relative to the base; and

    a relative position fixing mechanism configured to fix a position of the drive unit relative to the base,wherein;

    at least one member is used commonly between the relative position adjusting mechanism and the relative position fixing mechanism, the at least one member including a support shaft member mounted to the tubular holding portion of the base and extending in a tangential direction of the tubular holding portion;

    the relative position adjusting mechanism includes the support shaft member and a rotational member mounted on the support shaft member;

    the rotational member is configured to rotate along the outer circumferential surface of the housing in a direction parallel to a central axis of the drive unit, so that the position of the drive unit relative to the base changes as the rotational member rotates along the outer circumferential surface of the housing;

    the support shaft member has a first end portion and a second end portion opposite to the first end portion with respect to an axial direction;

    the first end portion of the support shaft member is rotatably supported by a first part of the tubular holding portion of the base;

    the second end portion of the support shaft member is rotatably supported by a second part of the tubular holding portion of the base, the second part being spaced from the first part in a circumferential direction of the tubular holding portion;

    the relative position fixing mechanism includes the support shaft member and is configured to be able to move the support shaft member in the axial direction, so that the first part and the second part move toward each other to reduce a circumferential length of the tubular support portion for tightening the tubular holding portion around the outer circumferential surface of the housing;

    the relative position fixing mechanism further includes a shift mechanism for moving the support shaft member in the axial direction;

    the shift mechanism corn rises a cam portion rotatable about a rotational axis and an operation lever portion extending from the cam portion in a radial direction with respect to the rotational axis of the cam portion;

    the cam portion acts on the support shaft member to move the support shaft member in the axial direction according to the rotational position of the cam portion;

    the operation lever portion is operable for rotating the cam portion; and

    the operation lever portion is configured to rotate about the rotational axis within a plane perpendicular to an axial direction of the tubular holding portion.

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