Patent ID: 6633015
Filing Date: 2003-10-14
Classification: B23K,F15B

Abstract:
A soft-touch pneumatic drive unit comprising first cylindrical wall means, a first end block closing off an end of said cylindrical wall means, a first separator block closing off another end of said first cylindrical wall means, second cylindrical wall means, said first separator block closing off an end of said second cylindrical wall means, a second separator block closing off another end of said second cylindrical wall means, third cylindrical wall means, said second separator block closing off an end of said third cylindrical wall means, a second end block closing off another end of said third cylindrical wall means, piston rod means extending through said first end block, said first separator block, and said second separator block, a floating piston movable within said second cylindrical wall means on said piston rod means, a first piston affixed on said piston rod means within said second cylindrical wall means on the side of said floating piston toward said second separator block, a second piston affixed on said piston rod means within said third cylindrical wall means, said piston rod means having a first passage with a first port located within said second cylindrical wall means, and having a second port located toward said first cylindrical wall means from said first port, said piston rod means having a second passage with a third port located on the side of said first piston toward said third cylindrical wall means and having a fourth port on the side of said second piston opposite said second cylindrical wall means, means for supplying cushioning fluid through said first separator block, means for supplying return fluid through said first separator block, and means for supplying advance and welding fluid under pressure through said second end block.