Including Contiguous Oppositely Moving Knife Portions Patents (Class 83/792)
  • Patent number: 7677149
    Abstract: Embodiments of the present invention include a coping apparatus and method of operation that automates the process of forming coped butt joints on strips of molding for placement on internal wall angles that alleviates at least some of the problems associated with the use of miter joints or time consuming hand or powered coping using conventional coping saws.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: March 16, 2010
    Inventors: Thomas W. Hogan, John M. Hogan
  • Patent number: 6736037
    Abstract: A coping saw is provided having two spaced-apart rotary actuators supported by a frame. Two saw-blade sections extend between the two rotary actuators and are intended to singularly engage a work piece. The saw is adapted to contain a drive mechanism which is coupled to a first of the two rotary actuators for causing the saw-blade sections to move in at least one direction. At least one guide roller assembly is disposed each of the two saw-blade sections for providing stability and retaining said two-saw blade sections between said two rotary actuators.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: May 18, 2004
    Inventor: Ethan Dean
  • Patent number: 5509206
    Abstract: An improved portable band saw having a unitary, rigid frame, a novel blade alignment, greatly increasing the depth of cut.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: April 23, 1996
    Inventors: Jack L. Rowe, Donald M. Rowe
  • Patent number: 5001957
    Abstract: An offset bandsaw uses a drive pulley and a second pulley which is angularly offset from the first drive pulley. A bandsaw blade is formed by twisting the blade before welding the two ends together to form a continuous belt. The combination of the offset rollers and the twist permit the bandsaw blade to follow a more natural path which improves blade life. Rollers may be provided intermediate the drive pulley and top pulley to position the bandsaw blade portions in the same plane. Alternatively one may provide a third or fourth pulley to create a precision saw which can cut tight radii in a workpiece and make sizeable square cuts through stock of any length.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: March 26, 1991
    Inventor: Edward T. Steckler
  • Patent number: 4784029
    Abstract: A sawing method involving in one direction continuously driven saw blades (1, 2) or saw wheels, according to which two saw blades (1, 2) or saw wheels are arranged in an adjacent position to each other, with associated saw teeths extending in an opposed relationship to each other. The saw blades (1, 2) or the saw wheels are thereafter caused to perform a continuous movement in opposite directions to each other in the operative direction for each saw blade (1, 2) or saw wheel, whereby same in a common and co-acting operation take up a saw cut in a workpiece. In order to maintain the saw teeths of the saw blades (1, 2) or the saw wheels separated from each other during a sawing operation, a pneumatical or hydraulical medium under pressure is advantageously supplied against the adjacently located surfaces of the saw blades (1, 2) or the saw wheels during the sawing operation.
    Type: Grant
    Filed: December 1, 1986
    Date of Patent: November 15, 1988
    Inventor: Sven R. V. Gebelius