Patent attributes
A workpiece holding apparatus comprises a body, a bladder carried by the body, and a sleeve that is carried by the bladder. A fluid chamber is at least partially defined by the body and the bladder for containing a fluid therein. The bladder comprises at least one first polymer-containing section composed of a first polymer-containing material and is adapted to radially deflect the sleeve into engagement with the workpiece. The bladder further comprises at least one second polymer-containing section disposed adjacent to the first polymer-containing section(s) and is composed of a second polymer-containing material that is less flexible than the first polymer-containing material and where at least a portion of the second polymer-containing section(s) are constructed to engage elastomeric seals of the body of the workpiece holding apparatus to thereby seal pressurized fluid within the fluid chamber.
