Abstract: A blind riveting system is disclosed having a rivet gun with a housing defining a fluid chamber. A piston is slidably mounted in the fluid chamber and is moveable between a forward and a retracted position. The piston divides the fluid chamber into a drive chamber and a return chamber. A first source of incompressible fluid is fluidly connected to the drive chamber while, similarly, a second source of incompressible fluid is fluidly connected with the return chamber. A trigger on the rivet gun is moveable between an actuated position and a release position. Upon movement of the trigger to its actuated position pressurized, and incompressible fluid is provided under pressure to the drive chamber which drives the piston towards the retracted position, and in doing so, fastens the blind rivet. Upon release of the trigger, pressurized incompressible fluid is provided to the return chamber to thereby return the piston to its forward position in preparation for a subsequent riveting operation.

Abstract: Production hand tool equipped with pistol grip type handle for manipulating the tool at a comfortable angle including pivotal means for adjusting the angular relation of the handle in the central plane of the tool in order to optimize hand comfort in operation and relieve muscular fatigue incident to operating the tool over protracted periods at a constant angle. A male and female toroidal segment connection establishes a virtual transverse pivotal axis with handle rigidly secured by an internal clamp having cylindrical segment area bearing contact on an interior hollow connection end of the handle.