Cutting – Means to drive or to guide tool – Means to change datum plane of tool or tool presser stroke
Patent
1976-01-12
1976-11-30
Abercrombie, Willie G.
Cutting
Means to drive or to guide tool
Means to change datum plane of tool or tool presser stroke
83450, 83453, 83594, 83666, 30 11, 30310, 408189, B26D 136, B26D 726
Patent
active
039941949
ABSTRACT:
A cutting apparatus for making circular or circular arc-like cuts in a sheet of material such as paper, cloth, leather, plastic, rubber and the like. A substantially planar base is provided to receivably support said sheet and a hinged apertured clamping plate is lowered over the supported sheet to secure it against movement during the cutting operation which takes place through the aperture. An arcuate arm is secured to the base and an elongated portion of the arm positions an internally-threaded vertically-oriented boss above the aperture. An externally-threaded member is operably received within the boss and includes an adjustment disc for turning said member to raise or lower same within said boss. A blade-positioning shaft is received within a vertically-oriented central bore in the member and includes a shoulder to secure the shaft for vertical movement with the member. The lower distal end of the shaft includes a threaded pin for being slideably received within a radius selecting slot of the blade. The threaded pin may be turned to secure the blade to the lower distal end of the shaft at any selected radial distance from the vertical axis thereof which is defined by a centering tip received into a vertically-oriented bore in the threaded pin. A lever or knob is provided at the upper end of the shaft for rotating same to make the desired cut after the height or depth of the cut has been adjusted by the adjustment disc of the externally threaded member and the proper radius of curvature has been selected.
REFERENCES:
patent: 1201456 (1916-10-01), Gruner
patent: 1661136 (1928-02-01), Endrezze
patent: 1799305 (1931-04-01), Lyness
patent: 2263637 (1941-11-01), Maupin
patent: 2546292 (1951-03-01), Bell
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