PNEUMATISCH-HYDRAULISCHES NIETGERÄT

摘要

A rivet gun includes a pneumatic motor (4), that drives a segment stem 7. A pneumatic cylinder (21) actuates a hydraulic cylinder (22) which sends oil under pressure to an expansion chamber (10) provided for moving back the segment stem (7) and buckling the rivet (2) fixing it to a laminate structure (100). The rivet gun also includes a change-over switching device (30) linked to controls (50,60) for reversing rotation of the motor (4). The controls (60) include an inlet valve (61) operated by a trigger (64) for connecting a compressed air infeed duct 14 with a feed-discharge duct (23) leading to the pneumatic cylinder (21). A discharge valve (63) is disposed in series with the inlet valve (61) and has an adjustment ring (176) for adjusting of the maximum traction force. Another discharge valve (90) is disposed in series with the discharge valve (63) previously mentioned and is provided for adjustment of the stroke of the segment stem (7).