Packaging assembly for substances to be post-mixed

Claim 1

A packaging assembly for substances that are to be post-mixed, comprising: a tube that is integrally formed as a single piece from a synthetic resinous material, having forward and rearward ends with a continuous cavity of forwardly diminishing cross section extending therethrough and containing a first flowable substance, said tube including a closed, pliant body portion at said rearward end and a close d nozzle portion at said forward end thereof; and an ampule smaller than and contained within said tube and integrally formed as a single piece from a synthetic resinous material, said ampule having forward and rearward ends with a continuous cavity of forwardly diminishing cross section extending therethrough and containing a second flowable substance therewithin, and including a closed, pliant body portion at said rearward end and a closed frangible portion at said forward end thereof, said frangible portion being adapted to be fractured under manually applied compressive force to open said ampule, and being comprised of; (a) a generally cylindrical sidewall element with an outer end; (b) a blunt end wall element extending transversely across said forward end of said ampule; and (c) a transition element extending between said outer end of said sidewall element and said end wall element, and connecting them to one another, said transition element forming a sharp internal angle having a value of about 90° or less at one of the intersections with said sidewall element and said end wall element, over which angle said material is relatively thin; whereby compressive force applied in the region of said transition element will concentrate stress at said one intersection, thereby tending to cause fracture thereat.