Boring device
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United States of America Patent
Stats
-
Dec 2, 2008
Grant Date -
Jul 13, 2006
app pub date -
Oct 21, 2003
filing date -
Oct 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A punching unit is arranged so that a plurality of punches is grouped into a first group having a predetermined number of punches and a second group containing any one of the punches in the first group and having a smaller number of punches. A punching state of the predetermined number of punches is produced by reciprocating a reciprocating member within a first range and by vertically moving the punches of the first group through the intermediary of cams and followers corresponding to the first group and another punching state of the smaller number of punches is reached by reciprocating the reciprocating member within a second movable range and vertically moving the punches of the second group through the intermediary of cams and followers corresponding to the second group. This arrangement allows the number of punches and dies to be reduced as compared to the prior art.
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