Electric arc saw apparatus
AssigneeThe United States of America as represented by the United States Department of Energy
InventorPaul R. Deichelbohrer
Life of this patent
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Abstract
A portable, hand held electric arc saw has a small frame for supporting an electrically conducting rotary blade which serves as an electrode for generating an electric arc to erode a workpiece. Electric current is supplied to the blade by biased brushes and a slip ring which are mounted in the frame. A pair of freely movable endless belts in the form of crawler treads stretched between two pulleys are used to facilitate movement of the electric arc saw. The pulleys are formed of dielectric material to electrically insulate the crawler treads from the frame.
Claims7
A portable hand-held electric arc saw apparatus comprising:
- a frame, means for mounting a rotatable shaft on said frame, an electrically conducting blade rigidly secured to said shaft and engagable with a workpiece of opposite polarity for generating an electric arc therebetween, electrically conducting means mounted on said frame for transmitting current to said blade and including a slip ring secured to said shaft, a plurality of brushes mounted on said frame and having inner ends engaging the periphery of said slip ring, a handle mounted on said frame for facilitating handling and guidance of said blade relative to said workpiece, a base member mounted on said frame and having a slot therein for accommodating said blade, means for adjustably mounting said blade for varying the extent of blade projection past said base member, mobile means projecting through said member and engagable with said workpiece for facilitating movement of said apparatus relative to said workpiece, and means for electrically insulating said mobile means from said base member.
Dependencies are inferred from the claim text.