Fluid pressure operable actuators.

摘要

A fluid pressure operable tube-mounted brake actuator has a housing (1, 2) containing a pressure responsive diaphragm (4) which divides the housing into a pressure chamber (6) and a non-pressure chamber (7). The latter having an inwardly projecting end (11) of the tube and an actuator output rod (8) which passes through the tube and a flexible contaminant excluding boot (12) one end (13) of which engages a point on the rod and the other end (15) is held in engagement with the inner end of the tube by means of pressed in fastening member (16) which engages the internal surface of the tube.