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Portable hand machine tool, particularly angle gringer

  • US 4,901,479 A
  • Filed: 04/14/1989
  • Issued: 02/20/1990
  • Est. Priority Date: 12/10/1986
  • Status: Expired due to Fees
First Claim
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1. A portable hand machine tool, particularly, an angle grinder, comprising a hollow drive shaft having opposite ends;

  • a counterflange mounted on one of said opposite ends of said hollow drive shaft for joint rotation therewith;

    a spindle having a longitudinal central axis and extending through said hollow drive shaft and coupled thereto for joint rotation therewith and axial displacement relative thereto, said spindle extending through said counterflange and having a threaded end portion;

    a clamp nut received on said threaded end portion of said spindle and cooperating with the said counterflange for clamping a tool therebetween;

    a slide member having an inclined surface and slidable in a direction transverse to the longitudinal central axis of said spindle to provide for axial displacement of said spindle relative to said drive shaft and for axial slackening of said clamp nut, said slide member being formed as a wedge coupled to said drive shaft and said spindle for joint rotation therewith and extending transverse through said drive shaft and said spindle, said drive shaft having a wedge surface, said inclined surface of said slide member being located on a side thereof facing the counter flange and said inclined surface abutting said wedge surface of said drive shaft and being displaceable therealong, said inclined surface of said wedgeand said wedge surface of said drive shaft having an inclination angle such that self-locking of said wedge and said drive shaft occurs; and

    means spaced from said drive shaft and said spindle for displacing said wedge.

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