Dale Gardner
Electrician at Beacon St, Colorado Springs, CO

5782588, Jul 21, 1998

Jun 25, 1996

8/670065

Dale W. Gardner - Colorado Springs CO

B23B 4514

408 80

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.

5785467, Jul 28, 1998

Jul 2, 1996

8/675340

Dale W. Gardner - Colorado Springs CO

B23B 4500

408 87

A multi-method capable portable machining apparatus including a lever bar and fulcrum that allows user to place multiplied pressure on the rotating cutting tool while at the same time controlling the torque and other reactional forces introduced by the operation. Provision is also made, in the work anchored fulcrum embodiment, so the operator can safely control break thru of the cutting tool by utilizing the compressive capability of the fulcrum in combination with a safety stop on the fulcrum. The design includes provision to apply multiplied pressure to the cutting tool using a fulcrum in either compression or tension mode. The device is light, compact, easily adjustable and multi-versatile to allow user ingenuity in method of application of the device to the situation at hand. One embodiment includes provision that allows safe, controlled operation without physically attaching fulcrum to the work.