Tool chuck for a hand-held power-driven punching machine or the like
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 1, 2002
Grant Date -
Jan 10, 2002
app pub date -
Jul 3, 2001
filing date -
Jul 7, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A punching machine has a power-driven plunger to which a punch is chucked to be driven into and out of a die for perforating sheet-metal work. The plunger has a punch socket formed centrally in its end for receiving the shank of the punch, and a plurality of ball guideways extending radially outwardly from the punch socket. Locking balls are slidably received one in each ball guideway for movement into and out of locking engagement in an annular groove in the shank of the punch received in the punch socket. Concentrically mounted on the plunger, a cam ring is sprung in one axial direction of the plunger for urging the locking balls into locking engagement with the punch shank. Each locking ball is elongated radially of the plunger with a view to reduction of the machine dimension axially of the plunger for given diameters of the plunger and the punch.
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