Patent ID: 8382459

Claim:
A piston pump for pumping a fluid, comprising: a cylinder structure defining a cavity; a piston at least partially disposed movably in the cavity, the piston including a first piston part and a second piston part; and a restoring element located in the cavity and arranged to prestress the piston; wherein the second piston part includes (i) a base, and (ii) a plurality of cantilevered members projecting from said base so as to define a fluid space and a mounting space therebetween, wherein the plurality of cantilevered members includes (i) a first cantilevered member projecting from said base and terminating in a first free end, and (ii) a second cantilevered member projecting from said base and terminating in a second free end, wherein (i) the first cantilevered member includes a first support ledge facing the mounting space, the first support ledge being spaced apart from the first free end, and (i) the second cantilevered member includes a second support ledge facing the mounting space, the second support ledge being spaced apart from the second free end, wherein the first piston part includes a substantially cylindrical body that extends into the first piston part so as to be located in the mounting space and positioned in contact with the first support ledge and the second support ledge, and wherein the first cantilevered member, the second cantilevered member, and the substantially cylindrical body defines a radial inlet of the piston.