Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Frictionally engaging sides of opening in work
Patent
1996-06-25
1998-07-21
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Frictionally engaging sides of opening in work
408101, 408120, 408137, 408204, B23B 4514
Patent
active
057825882
ABSTRACT:
Improved, draw bar assisted, rotary hole sawing apparatus that provides the versatility and methods required whereby operator ingenuity can achieve a set up to accomplish the required hole sawing or similar type machine operation in a wide variety of positions, conditions and situations. The design provides for applying rotational force from either the cutter side or opposite side of the device, and can be applied by hand power or with power tools. Provision is made, with a backing plate, to facilitate sawing very thin materials and to increase stability. The setup can be arranged so that draw bar pressure can be applied from either end of the device. Provision is made so that compensating force can readily and constantly be applied to resist the side force which tilts the tool axis relative to the work piece as a result of the secondary force introduced by the ratchet type method of rotating the cutter. Included in the design is a draw bar thrust nut handle of a shape and size that allows the operator to increase cutter pressure by gripping the handle as it rotates with a slipping friction to controllably tighten it. A lever bar embodiment allows operator to increase and decrease cutter pressure as desired when such control is required.
REFERENCES:
patent: 1435502 (1922-11-01), Sager
patent: 1590994 (1926-06-01), Misener
patent: 2777341 (1957-01-01), Marchant
patent: 2815569 (1957-12-01), Powers
patent: 4380990 (1983-04-01), Giardini
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