Patents by Inventor David G. Greene

David G. Greene 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).

  • Patent number: 4946149
    Abstract: A programmable bed is provided for machine tools and the like, such as routers, boring tools, and other powered cutters and shapers. The programmable bed has a platen shaped to support differently sized workpieces thereon, and includes a plurality of retractable stops slidably mounted in the platen. The stops are selectively and individually shifted vertically between extended and retracted positions in response to the identification of a particular workpiece, so as to automatically locate or index the same on the platen at a preselected position relative to the machine tool. A plurality of pop-up suction chucks are also slidably mounted in the platen, and are selectively communicated with a source of vacuum. The suction chucks are reciprocated vertically between a retracted disengaged position, and an extended engaged position abutting an adjacent surface of the workpiece, so as to securely retain the workpiece in its preselected position during the machining operation.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: August 7, 1990
    Assignee: Steelcase, Inc.
    Inventor: David G. Greene
  • Patent number: 4880218
    Abstract: A programmable bed is provided for machine tools and the like, such as routers, boring tools, and other powered cutters and shapers. The programmable bed has a platen shaped to support differently sized workpieces thereon, and includes a plurality of retractable stops slidably mounted in the platen. The stops are selectively and individually shifted vertically between extended and retracted positions in response to the identification of a particular workpiece, so as to automatically locate or index the same on the platen at a preselected position relative to the machine tool. A plurality of pop-up suction chucks are also slidably mounted in the platen, and are selectively communicated with a source of vacuum. The suction chucks are reciprocated vertically between a retracted disengaged position, and an extended engaged position abutting an adjacent surface of the workpiece, so as to securely retain the workpiece in its preselected position during the machining operation.
    Type: Grant
    Filed: December 3, 1987
    Date of Patent: November 14, 1989
    Assignee: Steelcase Inc.
    Inventor: David G. Greene