Abstract: A connection device for connecting rocker, valve or injection assemblies in internal combustion engines, comprises a button defining a recess for housing herein an insert coupled to a rocker assembly or the like, the recess including a lubricating hole and the button comprising a button face contacting a driving plate and including a slot extending radially between the lubricating hole and the outer periphery of the button.

Abstract: A compressor unit of the type in which a rotary vane compressor draws air from an intake opening and directs it to a pressure tank through a minimum-pressure valve and is self-lubricated by oil supplied by the air pressure itself includes a non-return valve in the intake opening, which maintains the compressor under pressure when it stops. Thus, the internal pressure upstream and downstream of the compressor is balanced instantaneously and the lubricating oil does not get into the compressor, avoiding the consequent danger of damage or breakage upon subsequent starting.