Patent ID: 6516523
Filing Date: 2003-02-11
Classification: B26F

Abstract:
Apparatus comprisinga frame which defines a tool head with a handle portion extending therefrom, said tool head having a front face and a back face, an upper end and a lower end, a first lateral side and a second lateral side, said tool head defining a lower jaw and an upper jaw spaced apart from the lower jaw to define a first slot opening into the tool head from the first lateral side between the upper jaw and the lower jaw, said lower jaw defining a first vertical borehole therethrough extending alongside the first lateral side, said first vertical borehole having a longitudinal axis and opening toward the upper jaw, said upper jaw defining a second vertical borehole therethrough extending alongside the first lateral side, said second vertical borehole having a longitudinal axis and opening toward the lower jaw and being in alignment with the first vertical borehole, said tool head further defining a second slot which is vertically elongated and forms a passage from the first vertical borehole to the second lateral side of the tool head, said tool head further defining a first transverse aperture which forms a passage extending from the front face of the tool head to the second slot and a second transverse aperture which forms a passage extending from the back face of the tool head to the second slot, said second transverse aperture being in alignment with the first transverse aperture, wherein the handle portion extends from the lower end of the tool head, a plunger having a longitudinal axis, a first end and a second end slidably mounted in the first vertical borehole, said plunger having a downwardly facing cam face between its first end and its second end, and wherein the second end of the plunger defines a blade suitable for forming a hole in a flat stock, said blade being sized so as to be received by the second borehole in the upper jaw a lever arm having a cam end, a cam end portion extending from the cam end, a handle end, a handle end portion extending from the handle end, and a pivot portion which connects the cam end portion and the handle and portion and defines a transverse aperture for receiving a pivot pin, and a pivot pin which extends through the transverse aperture in the lever arm, the first transverse aperture in the tool head, and the second transverse aperture in the tool head, to pivotally mount the lever arm to the tool head with the cam end portion of the lever arm being positioned in the second slot so that the cam end of the lever arm cammingly contacts the downwardly facing cam face of the plunger, wherein the handle portion of the frame has a longitudinal axis and extends from the head at an angle between about 15 degrees and about 60 degrees as measured from the longitudinal axis of the borehole, and the pivot portion of the lever arm defines a bend in the range of from about 30 degrees to about 60 degrees so that the cam end portion of the lever arm extends from the longitudinal axis of the plunger at an angle in the range of which is in the range of from about zero degrees to about 30 degrees, and the lever arm is mounted to the tool head for pivotal motion over an angle in the range of from about zero degrees to about 45 degrees with respect to the longitudinal axis of the handle portion of the frame.