Plastic pump construction

Claim 1

IN A PLASTIC HAND PUMP CONSTRUCTION, IN COMBINATION, A PUMP CYLINDER AND PLUNGER SHANK RECIPROCABLE THEREIN; A FELXIBLE PLASTIC DISHCARGE FITTING COMPRISING A CAP SECURED TO THE CYLINDER, SAID CAP HAVING AN OUTLET PASSAGE FOR LIQUID AND HAVING A BEARING OPENING THROUGH WHICH LATTER THE PLUNGER SHANK EXTENDS; A SUBSTANTIALLY RIGID PLASTIC BEARING BUSHING FOR THE PLUNGER SHANK, EXTENDING AROUND THE LATTER AND CARRIED BY THE DISCHARGE FITTING AT THE BEARING OPENING THEREOF, SAID BUSHING BEING CONSTITUTED AS A PIECE SEPARATE FROM THE DISCHARGE FITTING; A RESILIENT PLASTIC SEALING COLLAR SEPARATE FROM THE BEARING BUSHING AND THE DISCHARGING FITTING AND HAVING A MOUNTING FLANGE PORTION AND A DEPENDING SKIRT PORTION, SAID COLLAR EXTENDING AROUND THE PLUNGER SHANK WITH THE SKIRT PORTION PROJECTING INWARD OF THE PUMP CYLINDER, ENGAGING THE BEARING BUSHING AND DISCHARGE FITTING AND BEING CARRIED BY THE LATTER, THE SKIRT PORTION OF THE COLLAR CLOSELY FITTING AND SEALINGLY ENGAGING THE PLUNGER SHANK UNDER CONTINUAL PRESSURE AND PREVENTING THE PASSAGE OF LIQUID BETWEEN THE BEARING BUSHING AND PLUNGER SHANK AS THE LATTER IS MOVED OUTWARD OF THE CYLINDER; A RIGID PLASTIC SUPPORT RING DISPOSED WITHIN THE DISCHARGE FITTING AND ENGAGED WITH THE FLANGE PORTION OF THE SEALING COLLAR, FOR HOLDING THE COLLAR IN THE FITTING, SAID DISCHARGE FITTING HAVING A SLEEVE PORTION RECEIVING ONE END OF THE PUMP CYLINDER AND THE END EDGE OF SAID CYLINDER ABUTTING THE SUPPORT RING AND RETAINING THE SAME ENGAGED WITH THE FLANGE PORTION OF THE SEALING COLLAR, SAID BEARING BUSHING HAVING AN ANNULAR RECESS IN ITS OUTER PERIPHERY AND SAID DISCHARGE FITTING HAVING AN INTERNAL ANNULAR FLANGE DISPOSED IN SAID RECESS AND PROVIDING AN INTERFITTING ENGAGEMENT BETWEEN THE FITTING AND BUSHING, THE PERIPHERY OF THE BEARING BUSHING AND FLANGE PORTION OF THE SEALING COLLAR TOGETHER WITH THE SUPPORT RING BEING CLAMPED BETWEEN THE END EDGE OF THE CYLINDER AND THE INTERNAL ANNULAR FLANGE OF THE DISCHARGE FITTING.