Patents by Inventor Earl C. Andrews

Earl C. Andrews has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • One-piece collet and process for making same
    Patent number: 4249748
    Abstract: A one-piece collet for use in machine tools, which collet comprises a rear portion which is cold worked to provide a bore of smaller diameter than the bore of the central portion of the collet, which reduced bore is threaded. The cold working of the rear portion produces a transitional area between the different sized bores of the rear and central portions which is characterized by a smooth, uniform grain flow, with unbroken flow lines, resulting in increased tensile strength and longer fatigue life of the collet. The front portion of the collet may also be cold worked to provide a similar transitional area between the central portion of the collet and the reduced bore of the front portion of the collet.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: February 10, 1981
    Assignee: Hardinge Brothers, Inc.
    Inventor: Earl C. Andrews
  • One-piece collet
    Patent number: 4245846
    Abstract: A one-piece collet for use in machine tools, which collet comprises a rear portion which is cold worked to provide a bore of smaller diameter than the bore of the central portion of the collet, which reduced bore is threaded. The cold working of the rear portion produces a transitional area between the different sized bores of the rear and central portions which is characterized by a smooth, uniform grain flow, with unbroken flow lines, resulting in increased tensile strength and longer fatigue life of the collet. The front portion of the collet may also be cold worked to provide a similar transitional area between the central portion of the collet and the reduced bore of the front portion of the collet.
    Type: Grant
    Filed: May 2, 1978
    Date of Patent: January 20, 1981
    Assignee: Hardinge Brothers, Inc.
    Inventor: Earl C. Andrews