Patent ID: 7600658
Filing Date: 2009-10-13
Classification: B29B,B67D,Y10T

Abstract:
1. A viscous material feed system, comprising: a feed tube that receives material expressed from a container; and a container evacuator comprising a chamber to hold a container to express material from the container to the feed tube and a plunger comprising a platen axially connected to a driving piston and slidably accommodated within the chamber, an O-ring fitted against a platen driving face positioned between the platen and the platen driving face and; a feed tube that has at least one inlet on the platen driving face, a full ring with tabs extending to secure the O-ring to the platen driving face with a circumferential surface exposed to the chamber and a vacuum breaker valve to the chamber that seals the platen driving face when in contact with container material and retains residual material adhering to the platen driving face when the vacuum breaker valve is activated at a termination of a driving cycle of the platen through a container's contents; wherein the O-ring comprises a circumferential slope surface and the full ring comprises a bevel surface that fits complementarily to the circumferential slope surface to form a disruptable seal of bevel surface to slope surface until the vacuum breaker valve is activated to cause sag of the exposed circumferential surface to disrupt the seal.