초록 ▼

Apparatus for forming a self-standing skirt on the pressure bottom of a blow-molded carbonate beverage container. The preform is formed with an annular depending skirt, and the skirt is stretched with a stretch mechanism which engages all but a lower portion of the preform, so that during the stretc

Apparatus for forming a self-standing skirt on the pressure bottom of a blow-molded carbonate beverage container. The preform is formed with an annular depending skirt, and the skirt is stretched with a stretch mechanism which engages all but a lower portion of the preform, so that during the stretching of the preform concurrently with the blowing of the preform in a bottle mold, the lower portion folds inwardly to form a bottom ledge on the stretched skirt. The mold is provided with a centering mechanism for assuring the centering of the preform within the mold cavity to assure that the preform skirt receives the skirt stretching mechanism.

대표청구항 ▼

Apparatus for the formation on a blow-molded container of a skirt on the container bottom to provide for the free standing of the container in an upright position, said container being blown in a mold cavity from a preform having an annular skirt portion at an end thereof remote from the container t

Apparatus for the formation on a blow-molded container of a skirt on the container bottom to provide for the free standing of the container in an upright position, said container being blown in a mold cavity from a preform having an annular skirt portion at an end thereof remote from the container top and surrounding an end of the preform, comprising: a mold having a mold cavity with a mold top for supporting said preform in depending relation in said cavity and a mold bottom, a plurality of articulated fingers extending through said mold bottom into the interior of said mold cavity and arranged in an annular array, said fingers terminated in outwardly-facing skirt-spreading surfaces proportioned to be received within said preform skirt portion prior to blowing of said preform, said surfaces having a length in the axial direction less than the axial length of said skirt portion with a lower free end of said skirt portion extending below sand finger surfaces, a finger support mechanism external to said mold cavity supporting said fingers for axial and radial movement with respect to said mold cavity, said external means including cam means in engagement with said fingers, said finger support mechanism being responsive to movement of said preform in said mold cavity during blowing thereof for causing a defined radial movement of said fingers in unison concurrently with axial movement thereof, to stretch said skirt portion into an annular support skirt on the container bottom and providing for the folding radially inwardly of said skirt portion lower free end to form an inwardly extending ledge on the bottom of said skirt.