US Patent: 339,544 - Combined boring-tool and holder


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


Quick search:	Patent number:	Patent Date:

US Patent: 339,544

Combined boring-tool and holder

Patentee:

Simon Peter Graham (exact or similar names) - Galt, ON Canada

USPTO Classifications:

408/226, 408/231

Tool Categories:

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

woodworking machines : wood drilling and boring : drill presses : drill press chucks

metalworking machines : drilling and boring : drill presses : drill press chucks

Assignees:

None

Manufacturer:

Graham Twist Drill Co. - Detroit, MI

Witnesses:

A. Edmunds

P. J. Edmunds

Patent Dates:
Applied:	Jul. 14, 1885
Granted:	Apr. 06, 1886

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
owwm.org discussion of Graham shank drill bits

Description:

This invention is a special drill chuck and drill-bit shank that provided positive non-slip engagement. They were particularly useful in production applications with multi-spindle drilling machines where a dull bit might not be noticed immediately. The chucks and bits were manufactured by several companies, including the inventor's company after he relocated to Detroit.

"This invention relates to improvements on shanks of drills for boring iron, or shanks of bit for boring wood, or any boring-tool where a holder is required to hold it while rotating same; and this invention consists of a drill or wood-bit in the shank of which two grooves are formed, to which grooves the jaws or prongs of the holder are fitted, so as to hold said drill or bit while it is being rotated."