Patents by Inventor Leonard R. Arnold

Leonard R. Arnold 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).

  • Heavy duty cutting insert
    Patent number: 4218160
    Abstract: A heavy duty, indexable insert for use in single-point and multiple-point negative rake holding devices, which includes a polygonal body having conjunctive sides providing cutting edges bounding a flat, narrow, downwardly inclined land which drops off sharply into a wide pocket which inclines at a very low angle to the center or axis of the insert and also narrows in width from the corners of a particular edge to center.
    Type: Grant
    Filed: September 15, 1978
    Date of Patent: August 19, 1980
    Assignee: Fansteel Inc.
    Inventor: Leonard R. Arnold
  • Positive chip control insert
    Patent number: 4189265
    Abstract: An indexable, insert for single-point and multiple-point negative rake holding devices which convert the cutting point to a positive cutting geometry. The insert has straight descending and widening V-shaped grooves from each corner along the adjacent sides, each groove modulating into a low angle straight section which rises abruptly into a radial cross-ridge at the midpoint of the groove, the cross-ridge rising to a crest line below the plane of the resulting island created by the grooves around the insert.
    Type: Grant
    Filed: September 15, 1978
    Date of Patent: February 19, 1980
    Assignee: Fansteel Inc.
    Inventors: Leonard R. Arnold, Robert W. Berry, Jr.