Patent ID: 7219526

Claim:
A portable pneumatic compression riveter comprising: a valve body constructed of a composite material, said valve body housed in a valve assembly used to actuate a portable pneumatic compression riveter by allowing compressed air to flow into an adjacent cylinder assembly of the compression riveter, a cylinder assembly provided adjacent to the valve assembly, the cylinder assembly provided with at least one chamber, a piston provided in each chamber so that compressed air flowing into the cylinder assembly from the valve assembly causes pressure to build up behind each piston and causes the piston to move toward an adjacent rivet head assembly, each piston sealed within its associated chamber by a bulkhead, all pistons attached to a single shaft so that the shaft moves with the pistons, a clevis attached to the shaft, a rivet head assembly provided adjacent to the cylinder assembly, said rivet head assembly having two jaws, one jaw in the head assembly being stationary and one jaw being pivotable about a center pin, a wedge movably provided within the rivet head assembly, said wedge pinned to the clevis so that the wedge moves with the shaft and pistons, the wedge movable between a set of bearing provided in the rivet head assembly and engaging a rear end of the pivoting jaw so that the pivoting jaw pivots and closes a forward end of the pivoting jaw with a forward end of the fixed jaw whenever the wedge extends between the set of bearings, the pistons constructed of a composite material, the composite pistons fitted with u-ring seals; the cylinder made of aluminum and without the benefit of a surface hardening treatment such as hard anodize on the interior; the outside diameter of the composite pistons being a wear ring so that the u-ring seals seal the gaps that form between the pistons and their associated cylinders.