Clamp device
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United States of America Patent
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Jun 23, 2015
Grant Date -
Apr 26, 2012
app pub date -
Jun 11, 2010
filing date -
Jul 9, 2009
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A clamp device has a gripping member which is expandable and contractible and is inserted into an aperture in a workpiece and grips the aperture, a clamp rod including a tapered shaft portion that fits into the gripping member, and a drive means for driving the clamp rod forwards and backwards. Provided is a support mechanism that supports the gripping member by fluid pressure when the gripping member is radially expanded, and a fluid pressure release means that releases the fluid pressure of the support mechanism after radial expansion of the gripping member when the clamp rod is driven by the drive means to perform clamping. The support mechanism has an annular pressure reception member that supports the gripping member, and a supporting fluid chamber that causes fluid pressure in the direction opposite to the clamping direction to be received on the annular pressure reception member.
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