Twist drill

Cutting by use of rotating axially moving tool – Tool or tool with support – Having inversely angled cutting edge

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

408230, B23B 5102

Patent

active

042092752

ABSTRACT:
A twist drill for producing or enlarging holes in a metal workpiece includes a point with peripheral cutting shoulders and concave cutting lips leading inwardly from the shoulders to a central chisel point. The cutting shoulders are spaced slightly toward the shank end of the drill from the chisel point along the axis of the drill. The cutting lips are longitudinally convex so that points along the bases thereof will be spaced axially toward the drill shank from the cutting shoulders. The concave configuration along with the smooth curvature of the cutting lips facilitates quick removal of metal while causing minimal wear along the actual cutting surfaces. Chips are directed inwardly from the cutting shoulders and outwardly from the chisel point. The oppositely flowing chips converge within the drill flutes and are carried outward of the hole along the drill axis.

REFERENCES:
patent: 112115 (1871-02-01), Boyden
patent: 167766 (1871-09-01), Hunt
patent: 189265 (1877-04-01), Richardson
patent: 262588 (1882-08-01), Hartshorn
patent: 2600286 (1952-06-01), Weiland
patent: 3045513 (1962-07-01), Andreasson
patent: 3564947 (1971-02-01), Maier

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Twist drill does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Twist drill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Twist drill will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1479061

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.