Patent ID: 8870040

Claim:
A piping bag comprising in combination a two part nozzle and a pouch formed from a flexible material having a dispensing opening defined by conically inclined walls for dispensing thick, viscous fluids therethrough comprising, in combination; a nozzle tip having an inlet opening, an outlet opening, and a right circular, axially elongated tubular wall extending therebetween defined in part by an internally facing wall surface and an externally facing wall surface, and; a nozzle base having an inlet opening, an outlet opening, and a right circular axially elongated tubular wall extending therebetween, defined in part by an externally facing wall surface; said nozzle base further having a shoulder extending around an externally facing portion of the base tubular wall and spaced from the nozzle base outlet opening; said nozzle base being nestable within said nozzle tip with externally facing portions of said tubular wall of said nozzle base in opposed, mutually confronting relationship with internally facing portions of said tubular wall of said nozzle tip; screw means comprising mateable thread elements respectively disposed on said tubular wall of said base between the base inlet and outlet openings and on said tubular wall of said nozzle tip between the tip inlet and outlet openings, the screw means being initially engageable to hold said nozzle tip onto said nozzle base with said confronting portions in marginally spaced apart relationship and actuatable to draw said tip onto said base; wherein, upon actuation of said screw means, internally facing portions disposed within a hollow interior of said nozzle tip intermediate said screw means and said nozzle tip outlet opening and externally facing portions intermediate said screw means and said nozzle base outlet opening are shaped in a manner so as to move to an intersecting relationship around an annular path of narrow axial extent to trap a wall of said pouch therebetween and form a seal, and wherein said nozzle base is disposed on the interior of the conically inclined walls of said dispensing opening and said nozzle tip is disposed on the exterior thereof with said conically inclined walls of the flexible material projecting into the interior of said tip intermediate said outlet opening of said base and said outlet opening of said tip, characterized wherein the conically inclined walls of the projecting film material are sandwiched between the externally facing portions intermediate said screw means and said nozzle base outlet opening and the internally facing portions intermediate said screw means and said nozzle tip outlet opening to form an internal seal therewith, and wherein the shoulder of said nozzle base and the wall of said nozzle tip provide a narrow sealing band for the conically inclined walls of the projecting film material disposed intermediate said screw means and said outlet opening of said nozzle base.