US Patent: 2,358,304 - Method of Making Oil Hole Twist Drills


	Home\| FAQ	Search:Advanced\|Person\|Company\| Type\|Class	Login


Quick search:	Patent number:	Patent Date:

US Patent: 2,358,304

Method of Making Oil Hole Twist Drills

Patentee:

Stuart A. Cogsdill (exact or similar names) - Detroit, Wayne County, MI

USPTO Classifications:

72/324, 72/372, 76/108.1

Tool Categories:

metalworking machines : drilling and boring : drill bits : metalworking twist drills

Assignees:

Cogsdill Twist Drill Co., Inc. - Detroit, Wayne County, MI

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Dec. 07, 1942
Granted:	Sep. 19, 1944

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Cogsdill Twist Drill Co.

Description:

Claim:

In the manufacture of an oil hole twist drill from a cylindrical blank, the steps of forming a pair of longitudinally extending grooves in an exterior surface of said blank, one of said grooves being deeper and narrower than the other and said other of said grooves being disposed equally on, both sides thereof and shaped to form a bead along each side of the first-mentioned groove, and then simultaneously operating upon said beads to displace them toward one another and into contacting and sealing engagement with respect to each other whereby to close the outer side of said first-mentioned groove.