Finger actuated pump assembly

Claim 1

A manually operable pump for dispensing non-compressible liquid product comprising, a body, said body including container sealing means for forming a liquid tight engagement with a product container at one portion thereof and product discharge means including a discharge opening at another portion thereof, a resilient non-ballooning type bellows of relatively rigid construction which is collapsible upon application of pressure thereto, said bellows positioned in said body and forming a chamber for receipt of product from said container and subsequent dispensing thereof outwardly of said body, actuation means connected with said bellows for initially collapsing said bellows to apply a threshold pressure to said liquid, product discharge valve means at one end of said bellows and communicating with said body discharge opening to normally seal such and wherein further collapsing movement of said bellows sequentially builds up an increased pressure so as to alter the position of said discharge valve means from said normally closed position to an open position and forces product within said chamber outwardly of said discharge opening, and product entry valve means separate from said bellows positioned at the other end of said bellows for directing product into said chamber upon expansion of said bellows wherein said product moves through said chamber from said one end to the said other end upon said further collapsing of said bellows, said actuation means being a finger actuated trigger privotally supported from said body for arcuate movement with respect thereto, said bellows including a forwardly disposed relatively rigid front side wall positioned with respect to said body for arcuate movement about generally the same pivot point as said trigger such that said front wall and said trigger move as a unit, said trigger being integral with said relatively rigid bellows front wall.