Hole saw
AssigneeWalley Chao
InventorWalley Chao
Life of this patent
Estimating the term…
Abstract
A hole saw includes a shaft, a hole-cutter and an adjustable outer cutter unit. The shaft has a bottom coupling hole for receiving a pilot drill, a top coupling rod for fastening to a driving tool, and an outer thread extending around the periphery thereof. The hole-cutter has a top center inner thread threaded onto the outer thread of the shaft. The adjustable outer cutter unit has two locating rods perpendicularly affixed to the shaft at two sides in a line and two cutters respectively movably mounted on the locating rods, locked thereto with a respective lock screw and abutted against an outer periphery of said hole-cutter.
Claims4
A hole saw comprising:
- a shaft having a bottom coupling hole axially inwardly extending from a bottom end of the shaft for receiving a pilot drill, a top coupling rod for fastening to a driving tool, and an outer thread extending around a periphery of the shaft;
- a hole-cutter having a top center inner thread threaded onto the outer thread of the shaft;
- and
- an adjustable outer cutter unit having at least one locating rod transversely affixed to the shaft, and at least one cutter moveably and positionably mounted on a side of said at least one locating rod and abutted against an outer periphery of said hole-cutter.
Dependencies are inferred from the claim text.