Power drill-saw with simultaneous rotation and reciprocation action

A rotatory sawing device comprising:

• an outer cylinder with an upper end and a lower end;
• a cam cylinder with first end and a second end;
• a cam cylinder drive shaft slidably connected to said cam cylinder at said first end;
• a cam cylinder shaft with a distal end, said can cylinder shaft being attached to said cam cylinder at said second end;
• cutting-rod holding means attached to said cam cylinder shaft;
• a base-plate attached to said upper end of said outer cylinder with a bearing centrally located in said base-plate;
• said base-plate being to protect the cam cylinder and said bearing to support said cam cylinder drive shaft;
• a cover attached to said lower end of said outer cylinder with a bearing centrally located thereon;
• said cover being to protect the cam cylinder and said bearing to support said cam cylinder shaft;
• and
• a cutting-rod having a proximal end and a distal end, said cutting-rod being positionable in said cutting-rod holding means;
• wherein:
• said cam cylinder is slidably positioned within said outer cylinder;
• said cam cylinder has a cam groove on its surface, said cam groove being diagonally positioned so as to trace an elliptical orbit around said cam cylinder;
• a stationary cam key is positioned in a side of said outer cylinder, said cam key being positioned to fit into said cam groove of said cam cylinder;
• and
• said cutting-rod is centrally and axially attachable to said cam cylinder by said cutting-rod holding means;
• whereby rotation of said cam cylinder imparts a reciprocatory motion to said cam cylinder by action of said cam groove upon said stationary cam key, said reciprocatory motion of said cam cylinder imparts a reciprocatory motion to a cutting-rod positioned in said cutting-rod holding means, and said cam key may be released to cause said cam cylinder to move in a solely rotatory manner.