Viscous fluid dispenser

A dispenser for viscous fluids, comprising

• a housing having an opening in a lower portion thereof,
• a collapsible bag having an outlet,
• dispenser means arranged in the bag outlet for dispensing fluid from the bag, hanger means in the form of multiple pegs arranged in an upper portion of the housing for suspending the bag generally vertically with the bag outlet extending through the housing opening,
• roller means forming a nip and having a mass sufficient for collapsing the bag under the influence of gravity in order to positively extrude the fluid from the bag in response to operation of the dispenser means, and
• guide means allowing the roller means to descend under the influence of gravity from an initial position adjacent the hanger means only when the fluid is expelled from the bag,
• the collapsible bag forming an elongated flexible closure and having reinforced openings at its upper end for mating with the multiple pegs, the outlet being in a lower end of the bag, and dispenser means arranged in the bag outlet for dispensing fluid extruded from the bag by the roller means and otherwise forming an enclosed compartment for the fluid whereby fluid in the collapsible bag remains unexposed to the atmosphere until it exits from the bag outlet, the collapsible bag being laterally tapered adjacent the outlet at its lower end and having a thickness corresponding to the nip formed by the roller means to facilitate extrusion of substantially all fluid from the bag by the roller means.