Foam dispensing apparatus
AssigneeInstapak Corporation
InventorCharles R. Sperry
Life of this patent
Estimating the term…
Abstract
Apparatus for mixing and dispensing two liquids such as organic resins and polyisocyanates which react to form a polyurethane foam. The apparatus comprises a dispensing gun and related equipment and includes a reciprocally mounted valving rod in the gun, which valving rod is circular at its ends and flattened intermediate such ends. In its retracted position, the valving rod is bathed in a liquid which acts as a cleansing agent therefor.
Claims14
In an apparatus for mixing and dispensing a plurality of liquids having a housing means, a mixing chamber in said housing means having an outlet at its forward end and a plurality of entrance ports upstream of said outlet and each entrance port for introducing fluid into said chamber, a movable valving rod for opening and closing said entrance ports, means for moving said valving rod from a forward or extended-position to rear or retracted-position away from said forward end, and a reservoir adapted to hold material for cleaning said rod when in said retracted position, the improvement comprising:
- said rod having a reduced cross-sectional portion intermediate the ends thereof having a portion with a flat side, said flat side being positioned in said reservoir when the rod is in said retracted-position and out of the reservoir and within the mixing chamber when the rod is in the extended-position.
In an apparatus for mixing and dispensing a plurality of liquids having a housing means, a mixing chamber in the housing having an outlet at its forward end and a plurality of entrance ports upstream of said outlet each for introducing fluid into the chambers, a movable valving rod for opening and closing the entrance ports, means for moving the valving rod from an extended-position to a retracted-position, and a reservoir adapted to hold material for cleaning said valving rod, the improvement comprising said rod having a reduced cross-sectional portion intermediate the ends thereof:
- an elongated passageway connecting an opening formed in said rod from an intermediate opening to the forward end of the rod, said point being in said reservoir when said rod is in said retracted-position and out of said reservoir and within the mixing chamber when said rod is in the extended-position.
Dependencies are inferred from the claim text.