Patent ID: 8733462

Claim:
A portable apparatus for dispensing viscous material to a texture-spraying type gun, the apparatus comprising: a tank assembly having a body with an inner wall, wherein the tank assembly circumscribes a sealed cavity; a piston assembly slidably disposed within the sealed cavity, the piston assembly dividing the sealed cavity into an air-side chamber and a material-side chamber by providing an airtight seal therebetween, wherein the air-side chamber is configured conserve a controlled pneumatic pressure therein, wherein the material-side chamber is configured to carry a supply of viscous material, the piston assembly comprising: (1) one or more structural elements having a common radius; (2) a pair of plates sized to be accepted within the one or more structural elements; (3) an upward-flared seal engaged with inner wall to form an airtight seal, wherein the controlled pneumatic pressure of the air-side chamber facilitates the airtight seal; (4) a downward-flared seal engaged with inner wall to form an airtight seal, wherein the downward-flared seal is configured to scrape the inner wall such that viscous material is removed therefrom; (5) a fastener for compressing the upward-flared seal between one of the pair of plates and one of the one or more structural elements, and for compressing the downward-flared seal between one of the pair of plates and one of the one or more structural elements, such that the compression generates curvature within the downward-flared seal and upward-flared seal; and (6) a handle attached to one of the pair of circular plates with at least one bolt; and an air-control assembly for providing the controlled pneumatic pressure to the air-side chamber.