Working cylinder for pneumatic or hydraulic pressure media

A piston-cylinder module for fluid pressure media, comprising:

• a cylinder formed from a quadrangularly-shaped, preformed imperforate hollow-sectioned material having quadrangularly-shaped inner and outer wall surfaces, the bore of said cylinder extending along the longitudinal axis of said hollow-sectioned material such that opposing wall members of said cylinder are parallel and have smooth outer surfaces, said cylinder including a longitudinally extending threaded hole in an end face thereof;
• a cylinder cap including a projecting portion extending into said cylinder and a cover member forming a continuous external surface with the cylinder wall members, said projecting portion including a groove extending around the periphery thereof and a sealing member within said groove for sealing said cylinder bore, said cylinder cap further including a hole having a countersunk portion in the end surface thereof and aligned with said threaded hole receiving fastening means to be flush with said cap end surface and threadably engaging said threaded hole to secure said cylinder cap to said cylinder;
• a wall of said cylinder further defining an enlarged wall section extending transverse to said longitudinal axis and including a laterally extending bore therein extending between the smooth outer surface of the opposing parallel wall members, said enlarged wall section including a countersunk portion on one surface thereof opening onto said laterally extending bore and being adapted for receiving means for fastening said cylinder to a mounting surface;
• and
• a quadrauqularly shaped piston within said cylinder bore and including a piston rod extending through the open end of said cylinder.