Patent ID: 7611337

Claim:
A pump, comprising a casing that is generally cup-shaped adapted to be directly fixed to a driving motor ( 3 ), and containing a drive shaft ( 6 ) adapted to engage said motor having a tilted surface to actuate one or more pistons ( 7 ) that move parallel to the axis of said drive shaft; wherein each of said pistons is slidably mounted with interposition of a sealing element directly in a guide sleeve formed in one piece with said casing; wherein said casing is a monolithic body fully open at one end having radial appendices formed in one piece therewith which directly engage said monolithic body to said motor; wherein a system which supports and holds said drive shaft includes a bearing located near said open end of the casing and retained in position between a shoulder of the casing and an elastic Seeger ring constrained in a circumferential throat in said casing; and wherein said casing has internal dimensions transverse to the axis of said drive shaft, and said drive shaft and said system which supports and holds said drive shaft have external dimensions transverse to the axis of said drive shaft, configured to enable said pistons, said drive shaft and said system which supports and holds said drive shaft to be installed in said casing via said open end of said casing.