Patents Assigned to Circle Machine Company
  • Boring bar holder and insert with precision placement insert locator means
    Patent number: 5288182
    Abstract: A boring bar holder and removable insert member each equipped with cooperating precision locator means wherein any replacement of the insert within the boring bar holder will index the new insert with precision to the location of the previous insert. There are biasing means associated with the boring bar and the insert to wedgingly move the insert rearwardly to bias against a bore in the boring bar and to index the position of the cutting head of the insert in exact relationship to a previous insert placement.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: February 22, 1994
    Assignee: Circle Machine Company
    Inventors: Harvey L. Patterson, Efren D. Ofalla, John G. Harrel
  • Carbide shank boring bar with steel head
    Patent number: 5098233
    Abstract: A carbide shank boring bar having a coolant/lubricant bore running axially therethrough fitted with a steel head, said head being machinable to produce a pocket to receive a metal cutter insert wherein said boring bar shank and said steel head have a diameter less than one-half inch and said head is brazed without flux to said boring bar and no flux residue remains in said coolant/lubricant bore upon completion of said brazing. The method of achieving the fusion includes using an atmospheric vacuum chamber to conduct the fusion.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: March 24, 1992
    Assignee: Circle Machine Company
    Inventors: Harvey L. Patterson, Reginald Quintana