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Cutting mechanism

  • US 5,943,933 A
  • Filed: 07/23/1997
  • Issued: 08/31/1999
  • Est. Priority Date: 08/09/1994
  • Status: Expired due to Fees
First Claim
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1. A cutting mechanism for accurately cutting a notch through a first wall of a workpiece, and a co-operating score in a second wall of the workpiece;

  • said cutting mechanism comprising;

    a base member defining a generally planar base surface, and having first and second jig members mounted on the base surface such that respective base faces of the first and second jig members contact the base surface, in which said first and second jig members define a blade receiving aperture therebetween, said first and second jig members having respective first and second workpiece receiving surfaces opposite said respective base faces and each workpiece receiving surface disposed at a respective side of said blade receiving aperture, said first and second workpiece receiving surfaces being coplanar, and each of said first and second workpiece receiving surfaces being disposed in a first selected plane at a first selected distance from said base surface;

    said first and second jig members each having a front face, an opposing back face, and opposing side faces all extending generally perpendicularly from said base surface to said first and second workpiece receiving surfaces, respectively;

    workpiece clamping means mounted on said base member for clamping the workpiece against said first workpiece receiving surface of said first jig member and against said second workpiece receiving surface of said second jig member;

    a cutting blade having an inverted "V" configuration, said inverted "V" configuration having a vertex, said vertex of said inverted "V" configuration of said cutting blade being disposed in a second selected plane which is spaced at a predetermined distance "S" from said first selected plane, wherein said second selected plane defines the height of said blade with respect to said base surface, and wherein the height of sad blade receiving aperature with respect to said base surface is defined by said first selected distance, and is substantially the height of said blade; and

    actuation means to permit selective movement of said cutting blade between a first, retracted position and a second, extended position;

    whereby, when said cutting blade is moved from said retracted position to said extended position thereof, said cutting blade passes through said blade receiving aperture between said first and second jig members, and said vertex is moved in said second selected plane as said cutting blade is moved through said blade receiving aperture and through said first selected plane.

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