Method of making die-cast masonry drill

Details Method of making die-cast masonry drill Method of making die-cast masonry drill

1980-11-28

1982-07-06

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

B22D 1906

Patent

active

043376770

ABSTRACT:
A method for manufacturing a masonry drill is disclosed. The drill has an axially elongated body which is made from a die cast material and has one or more spiral grooves cast in its exterior surface substantially along its length. A hard insert is embedded in the leading end of the body. The insert is formed with sides having generally planar side portions, a top chisel edge, and a bottom edge. The insert preferably has projections for interlocking with the body. Each projection extends the greatest distance from the plane of the side portions near the bottom edge of the insert. The insert is held in place by casting the body around it so that the body substantially surrounds the projection, and especially entirely covers the portion of the projection nearest the chisel edge. As the die cast material of the body cools following the casting operation, it contracts around the insert to securely hold the insert in place. An extremely economical yet rugged drill is thus formed.

REFERENCES:
patent: 1186094 (1916-06-01), Heinkel
patent: 1657063 (1928-01-01), Brown
patent: 1866602 (1932-07-01), Ridgeway et al.
patent: 2614813 (1952-10-01), Shepherd
patent: 2635856 (1953-04-01), Scheffer
patent: 3447616 (1969-06-01), Granat

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