Hole saw and mandrel assembly
AssigneeRule Industries, Inc.
InventorsWilliam Cain, Ernest Emond, Karl Glawischnig, Robert Grant
Life of this patent
Estimating the term…
Abstract
A one piece hole saw assembly with mandrel permanently affixed to the hole saw cup. The mandrel contains a hollow shaft, a locking flange and reinforcing flange which are integrally formed as by machining. The locking flange of the mandrel mates with a locking hole or slot in the top surface of the hole saw cup. The reinforcing flange on the mandrel is welded during manufacture to the top surface of the hole saw cup. A pilot drill bit is inserted into the shaft core and welded to the shaft. The resulting product is a one piece hole saw assembly intended for use by simple insertion of the mandrel or shaft end of the pilot drill into the chuck of a conventional electric drill.
Claims13
A hole saw assembly comprising a hole saw cup and mandrel, said mandrel comprising a hollow shaft, a reinforcing flange and a locking flange, said shaft and said flanges integrally formed from one piece, said locking flange located proximally at one end of the shaft, the hole saw cup formed from one piece and having an open end and a substantially closed end surface opposite said open end, said open end having cutting teeth located along the peripheral edge thereof and said closed end surface having a locking hole at least substantially therethrough, said locking flange being engaged in the locking hole and said reinforcing flange being welded to said closed end surface of the hole saw cup.
A hole saw assembly comprising a hole saw cup and mandrel, said mandrel comprising a hollow shaft, a reinforcing member and a locking member, said shaft and said reinforcing member and said locking member integrally formed from one piece, the hole saw cup integrally formed from one piece and having an open end and a substantially closed end surface opposite said open end, said open end having cutting teeth located along the peripheral edge thereof, and said closed end surface having a locking hole at least substantially therethrough, said locking member being engaged in the locking hole and said reinforcing member being welded directly to the closed end surface of the hole saw cup.
A hole saw assembly comprising a hole saw cup and mandrel, said mandrel comprising a hollow shaft, a reinforcing member and a locking member, said shaft and said reinforcing member and said locking member integrally formed from one piece, the hole saw cup integrally formed from one piece and having an open end and a substantially closed end surface opposite said open end, said open end having cutting teeth located along the peripheral edge thereof, and said closed end surface having a locking hole at least substantially therethrough, said locking member being engaged in the locking hole and said reinforcing member being welded to the hole saw cup.
Dependencies are inferred from the claim text.