US Patent: 2,555,302 - Twist Drill


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US Patent: 2,555,302

Twist Drill

Patentee:

Glen H. Cogsdill (exact or similar names) - Plymouth, Wayne County, MI

USPTO Classifications:

408/226, 408/59

Tool Categories:

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

Assignees:

Glen H. Cogsdill - Plymouth, Wayne County, MI

Floyd F. Cogsdill - Detroit, Wayne County, MI

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Aug. 25, 1947
Granted:	Jun. 05, 1951

Patent Pictures:

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

Description:

Claim:

It is an object of the present invention to provide a twist drill having a longitudinally extending oil passage throughout its major portion and a plurality of inclined straight oil passages at its tip portion communicating at their inner ends with the first mentioned oil passage.