초록 ▼

A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for containing a sealing member such as an O-ring. An adjacent stem

A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for containing a sealing member such as an O-ring. An adjacent stem section includes a longitudinally-disposed channel that is in fluid-flow connection with the angled channel. The piston is disposed within a chamber of the body of the pump. Lateral movement of the piston within the body causes the sealing member to shift and block and unblock the end of the longitudinal channel which allows liquid from a liquid chamber to flow into a slot and to a pump chamber adjacent to the head of the piston's grooved end. The piston operates in association with an assembly for regulating the amount of liquid metered by the pump, a valve assembly for evacuating the liquid from the pump chamber into and through an outlet fitting, and a mechanism for regulating the flow of air into the outlet fitting to atomize the liquid.

대표청구항 ▼

[ What is claimed is:] [5.] A pneumatically-activated pump, comprising:a) a body having a central chamber and a chamber for holding a liquid source; andb) a piston disposed in the chamber, the piston comprising:a grooved end section with a head; a circumferentially disposed channel with a first side

[ What is claimed is:] [5.] A pneumatically-activated pump, comprising:a) a body having a central chamber and a chamber for holding a liquid source; andb) a piston disposed in the chamber, the piston comprising:a grooved end section with a head; a circumferentially disposed channel with a first side, a second side, a base portion therebetween, and a sealing member movably seated therein; and a slot in the head providing a fluid flowing connection between the channel and the head; anda stem section having a longitudinally disposed conduit on the periphery thereof, the conduit having a first end in fluid-flowing relation with the channel; anda second end;wherein the liquid chamber surrounds the stem, and lateral motion of the piston within the chamber of the pump causes the sealing member to move between a first position where the sealing member is adjacent the first side of the channel with the first end of the conduit open to allow unrestricted fluid flow along the periphery of the stem section through the conduit and into the channel, and a second position where the sealing member is adjacent the second side of the channel with the first end of the conduit closed to prevent fluid flow between the conduit and the channel.