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US5048375: Method for constructing a rotating cutting tool

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Filing Information

Inventor(s) Yoshinobu Kobayashi ·
Assignee(s) KOBAYASHI YOSHINOBU ·
Attorney/Agent(s) Cushman, Darby & Cushman ·
Primary Examiner Daniel W. Howell ·
Application Number US7598814
Filing date 10/16/1990
Issue date 09/17/1991
Predicted expiration date 09/08/2009
U.S. Classifications 76/108.6  · 408/144  · 279/103  · 408/226  · 408/239R  ·
International Classifications B21K 502  ·
Kind CodeA
International Classifications 279102;103;104 ·
Related U.S. Application DataThis is a continuation of application Ser. No. 07/404,496, filed on Sept. 8, 1989, which was abandoned upon the filing hereof.
Foreign Priority JP63124412[U] - 09/22/1988 ·
3 Claims, No Drawings


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.

Independent Claims | See all claims (3)

  1. 1. A method for constructing a rotating cutting tool comprising the steps of:providing a rotating cutting part;providing a solid monolithic shank which is larger in diameter than the rotating cutting part;providing a through-aperture in the shank extending from a first end of the shank to a second end of the shank;heating the shank to expand the shank;inserting the rotating cutting part into the first end of the through-aperture of the heated shank;cooling the shank to contract the shank around the rotating cutting part; wherein the rotating cutting part can be removed from the shank and replaced when the rotating cutting part has worn and when the rotating cutting part has broken by reheating the shank to expand the shank, and pushing the rotating cutting part out of the shank through-aperture with a rod inserted in the second end of the through-aperture.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US1285589 Barnes Nov 1918
US1409753 MOORE JOHN B Moore Mar 1922
US2369321 GEN MOTORS CORP Stalker Feb 1945
US3678632 KENNAMETAL INC Eversole et al. Jul 1972
US3751176 VON HOLLEN TOOL CO INC Von Hollen Aug 1973
US3790297 MAURSEY E Maursey Feb 1974

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
DE2811977HAWERA PROBST KG HARTMETALLSep 1979
DE3232686MAIER KG ANDREASMar 1984
NL8101761SKIL NEDERLAND NVNov 1982
CH53632LAIS EUGENOct 1910
SU645773KORNEEV NIKOLAJ NFeb 1979
GB5471Feb 1913

Other Publications

Popular Mechanics Shop Notes, 1942, p. 202.

Patent Family

The current document is not in a family.