Tool Holder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 1, 2001
Grant Date -
N/A
app pub date -
Sep 23, 1999
filing date -
Sep 25, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tool holder has a shank, a flange and a tool holding portion. From its front to rear end, the shank has on its outer periphery a first cylindrical surface, a tapered surface, and a second cylindrical surface. A tapered sleeve is mounted on the shank. Belleville springs are mounted between the large-diameter end of the tapered sleeve and the flange of the tool holder. The tapered sleeve is formed with a tapered outer surface adapted to be brought into close contact with a tapered inner surface of a bore formed in the spindle, and a cylindrical inner surface adapted to be brought into close contact with the second cylindrical surface of the shank. If a gap forms between the spindle and the tapered sleeve when the spindle is rotating at a high speed, the tapered sleeve is urged by the belleville springs in such a direction that the gap disappears, thereby maintaining a centripetal tendency and rigidity.
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