Dispensing valve to be used with bottles of fluent imaging material for the development of electrostatic images

Claim 1

A dispensing valve to be used on a supply bottle containing a fluent imaging material adapted to be employed in an electrostatographic copying machine, said bottle including a male half of a copending means, said valve comprising: (A) a valve cap having a skirt that is provided internally with a female half of a coupling means adapted to mesh with the male half of the coupling means on the bottle neck, (B) the valve cap having a central opening for passage of fluent imaging material from the bottle therethrough, (C) a spider in said opening, (i) the spinder having a bore coaxial with the opening in the cap, (D) a valve seat at the end of the central opening in the cap and facing the interior of the bottle, (E) a plastic spindle extending through the bore in the spider, (i) a flange molded in one piece with the spindle on the side of the spider remote from the valve seat, (F) a helical compression spring under compression between the spider and the flange, (G) the spindle having on the side of the spider remote from the spring a portion of reduced diameter to form a first shoulder where it joins the remainder of the spindle, (H) the spindle further having a top portion above the seat and adapted to be received within the bottle when the dispensing valve is mounted thereon, said top portion being pointed and having a base with a diameter greater than that of the reduced diameter portion of the spindle to form with the reduced diameter portion of the spindle a second shoulder facing the first shoulder, (J) a resilient centrally bored valve plug friction fitted on the reduced diameter portion of the spindle with its upper end butting against said second shoulder, (K) the space between the two shoulders being slightly less than the axial length of the valve plug so as to hold the valve plug under compression between said shoulders, (L) the top and bottom of the valve plug being substantially flat where they butt against said shoulders, (M) the reduced diameter portion of the spindle including at least one annular rib to engage the central bore of the valve plug and inhibit axial shifting of said plug, and (N) said rib having a steeply inclined side facing the spider.