Bushingless workhead
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United States of America Patent
Stats
-
Jun 14, 1994
Grant Date -
N/A
app pub date -
Mar 18, 1992
filing date -
Mar 18, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bushingless workhead comprises a flexible drill collet inside a flexible chucking collet. The chucking collet has external frusto-conical surfaces on the ends thereof that mate with corresponding frusto-conical surfaces on a pair of pistons. The pistons are slidable within a housing away from each other to apply opposed forces to the chucking collet. The forces cause the chucking collet to collapse and to also collapse the drill collet to grip a tool inside the drill collet. One piston applies a greater force on the chucking collet than the other piston. The chucking collet is thus forced to move longitudinally in one direction, and it abuts a fixed reference surface that repeatably locates the chucking collet during each tool gripping operation prior to the chucking collet collapsing to grip the tool.
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