Piston shoe retaining means

Full Title

Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00) > having cylinder axes coaxial with, or parallel or inclined to, main shaft axis > Details or component parts, e.g. valves, sealings or lubrication means (for machines or pumps having rotary cylinder blocks F04B1/2014) > Pistons > Piston shoe retaining means