Patent ID: 8061019

Claim:
A head for a riveting machine for applying shear rivets, the head comprising: a front part and a rear part comprising a plate and a body, respectively; said plate having an axial hole for receiving a stem of a rivet and said body having an axial hole formed along the same or substantially same axis of the hole formed in the plate; said plate and body slidable relative to each other along a direction parallel to said axis of the hole formed in the plate; a sliding engagement assembly arranged within a sliding chamber, defined inside said body, so as to engage the stem of a shear rivet, said engagement assembly being capable of taking a first, advanced position and a second, retracted position inside said chamber; a chuck having a set of radial segments or jaws arranged to engage a threaded or grooved end of the stem of the rivet; a flexible sleeve which has secured thereto the segments or jaws of said chuck; a control member controlling the backward movement of said engagement assembly due to a thrust of said plate during a return movement of said plate towards said body, said control member comprising a pin slidable within a side channel, parallel to said sliding chamber and having an extension that opens at the surface of said body towards said plate so as to let said pin come out from said body; a bushing onto which said flexible sleeve is fitted; and a ring nut that surrounds said flexible sleeve and is held between said sleeve and said bushing by an internal annular projection; said control member fastened to a radial support provided by said ring nut.