Metal tools and implements – making – Blank or process – Drill
Patent
1990-10-16
1991-09-17
Howell, Daniel W.
Metal tools and implements, making
Blank or process
Drill
279103, 408144, 408226, 408239R, B21K 502, B23B 5102
Patent
active
050483757
ABSTRACT:
Disclosed is a very small sized rotating and cutting tool comprising a rotating and cutting part such as drill bit and a shank which is a separate solid body having a through aperture permitting insertion of the rotating and cutting part into the through aperture and removal of the rotating and cutting part from the through aperture when it has been worn or broken. With this arrangement the worn or broken rotating and cutting part can be easily removed from the shank simply by pushing the rotating and cutting part out of the through aperture of the shank, and the shank can be reused. Also, advantageously the lathing of a relatively large cylinder into a "large-and-small cylindrical object" as is carried out in making a conventional miniature drill, is not required. For these reasons miniature rotating-and-cutting tools can be manufactured and marketed at reduced price.
REFERENCES:
patent: 1285589 (1918-11-01), Barnes
patent: 1409753 (1922-03-01), Moore
patent: 2369321 (1945-02-01), Stalker
patent: 3678632 (1972-07-01), Eversole et al.
patent: 3751176 (1973-08-01), Von Hollen
patent: 3790297 (1974-02-01), Maursey
Popular Mechanics Shop Notes, 1942, p. 202.
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