Piston type pump

Claim 1

A PISTON TYPE PUMP COMPRISING, A HOUSING BODY HAVING HORIZONTAL FLAT TOP AND BOTTOM, AN UPSTANDING CYLINDRICAL BORE EXTENDING THROUGH THE FLAT TOP AND BOTTOM THEREOF AND HAVING AN ATMOSPHERIC OPENING MEDIALLY OF THE BODY CONSTITUTING A LATERAL DRIVE-RECEIVING ENLARGEMENT AT AN INTERMEDIATE PORTION OF SAID CYLINDRICAL BORE, A PAIR OF PASSAGEWAYS EACH EXTENDING THROUGH THE FLAT TOP AND BOTTOM OF SAID HOUSING BODY AT OPPOSED SIDES OF SAID CYLINDRICAL BORE, AN INLET COMMUNICATING WITH ONE OF SAID PASSAGEWAYS, AN OUTLET COMMUNICATING WITH THE OTHER OF SAID PASSAGEWAYS, A VALVE ASSEMBLY INSERTED IN EACH END OF EACH PASSAGEWAY, A CYLINDRICAL SLEEVE INSERTED IN EACH END OF SAID CYLINDRICAL BORE, A PISTON IN EACH OF SAID CYLINDRICAL BORES, A DRIVE ASSEMBLY RECIPROCABLY CONNECTED TO THE PISTONS, A HOUSING HEAD SECURED OVER THE CYLINDER BORE AND THE END OF EACH PASSAGEWAY AT THE TOP OF SAID HOUSING BODY, A HOUSING FOOT SECURED OVER THE CYLINDER BORE AND THE END OF EACH PASSAGEWAY AT THE BOTTOM OF SAID BODY, EACH OF SAID HEAD AND FOOT HAVING A FLAT FORWARD AREA ALONG AND ADJACENT PORTIONS OF THE PERIPHERY THEREOF AND A REARWARDLY RECESSED AREA INSCRIBED WITHIN SAID FLAT FORWARD AREA AND PROVIDING COMMUNICATION BETWEEN SAID PAIR OF PASSAGEWAYS AND SAID CYLINDER BORE, EACH OF SAID HOUSING HEAD AND FOOT FURTHER HAVING A PORTION OF SAID FLAT AREA THEREOF ABUTTING ASSOCIATED CYLINDER SLEEVES AND VALVE ASSEMBLIES AT MARGINAL PORTIONS THEREOF WHEREBY TO HOLD THE SLEEVES AND VALVE ASSEMBLIES IN THEIR INSERTED POSITION WITHOUT ADDITIONAL FASTENING MEANS.