Spring-operated liquid-dispensing device

Claim 1

A spring operated device for dispensing a liquid at a controlled rate comprising a rectangular housing formed of a pair of parallel and opposed side walls and two parallel and opposed end walls forming a rectangular shaped internal compartment therebetween, one of said side walls having a longitudinal slot opening into said compartment, an internal wall in said compartment spaced inwardly of and substantially parallel to said one of said side walls forming therebetween a guide track that is essentially parallel to said one of said side walls, said track having an upper end adjacent one of said end walls and a lower end adjacent the other one of said end walls, a collapsible bag disposed in said compartment, said bag adapted to store and dispense a liquid, a slide member disposed in said compartment, a constant torque, coiled spring disposed in said compartment, one end of said spring connected to said slide member, the other end of the spring connected to said housing so as to urge said slide member into pushing contact with said bag, said slide member adapted to move in said compartment between said end walls and thereby place a controlled pressure on said bag, and a boss rigidly connected to said slide member and extending from one side thereof through said longitudinal slot of said one of said side walls, said boss adapted to slide in and be constrained by said track so that as said slide member moves between said end walls, said slide member is caused to traverse a path at a maintained orientation relative to said side walls.