Shank attachment structure
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United States of America Patent
Stats
-
Feb 12, 2013
Grant Date -
Jan 14, 2010
app pub date -
May 18, 2007
filing date -
May 31, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A shank attachment structure which may supply coolant even if a drill without a center pin is attached. A shank can be attached to a shank attachment hole with a single motion. The outer diameter of the shank can be inserted into the shank attachment hole. A chamfered portion is formed around an edge of a base end, and an elongated concave portion is formed on a tip end. A coolant hole is formed on a base end of the shank attachment hole, and a valve body is disposed in the hole. A sealing member is disposed adjacent to the tip end side. A first sleeve is disposed such that a base of the shank moves the first sleeve, so that a base of the sleeve separates from the sealing member; and when the shank is not in contact with the tip, an outer peripheral surface of the first sleeve moves the engaging member radially outwardly.
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