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Expanding collet assembly

  • US 5,397,135 A
  • Filed: 07/01/1993
  • Issued: 03/14/1995
  • Est. Priority Date: 07/01/1993
  • Status: Expired due to Term
First Claim
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1. A collet assembly, comprising:

  • an arbor including a flange portion having a tapered annular recess constructed and arranged to cooperate with an annular tapered projection of a machine tool spindle for centering said arbor with respect to said machine tool spindle when said arbor is coupled thereto, said arbor including a shaft portion extending from said flange portion;

    said shaft portion including a first conical surface disposed at its free end and a second conical surface disposed adjacent said flange portion;

    said first and second conical surfaces being parallel to each other and disposed radially inwardly in the direction away from said flange portion;

    an expanding collet having alternately disposed slots to form a plurality of fingers extending inwardly from opposite collet ends and having inner conical surfaces at said collet ends that cooperate with said first and second conical surfaces;

    said expanding collet being axially slidably disposed around said shaft portion between a relaxed position when said collet is disposed away from said flange portion and an expanded position when disposed toward said flange portion;

    a draw plug disposed axially through said arbor in an opening in said shaft portion, said plug having a flanged head in engagement with one end of said collet;

    a draw bar adapter disposed within a recess in said arbor and securing one end of said draw plug, said adapter being secured to a draw bar for axially actuating said draw plug, thereby actuating said collet;

    an annular work locating stop secured to said flange portion and overlying at least a portion of an annular periphery of said collet, said stop having an annular free edge for abutting against a workpiece; and

    a key screw disposed on said arbor and engaging said adapter to prevent relative motion of said adapter with said arbor.

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