초록 ▼

A mold for forming a plastic cap and a method of removing a cap from such a mold. The mold includes female and male members which, together, form a mold cavity in which the cap is formed. The female member includes an upper assembly and a plurality of cams. The cams have radial protrusions engaging

A mold for forming a plastic cap and a method of removing a cap from such a mold. The mold includes female and male members which, together, form a mold cavity in which the cap is formed. The female member includes an upper assembly and a plurality of cams. The cams have radial protrusions engaging the male member to form annular recesses in the cap. The cap is removed from the mold by moving the upper assembly of the female member axially and the cams thereof radially away from the cap, and then removing the cap itself from the male member of the mold. Preferably the cap is shrunk onto the male member to develop a space between the cap and the female member of the mold prior to moving the female member away from the cap.

대표청구항 ▼

A method of removing a plastic cap from a mold in which hot molten plastic has been cooled to form said cap, said cap having a top wall, downwardly depending cylindrical side wall with an outer surface and ring removably connected to the bottom of the side wall by frangible means disposed radially i

A method of removing a plastic cap from a mold in which hot molten plastic has been cooled to form said cap, said cap having a top wall, downwardly depending cylindrical side wall with an outer surface and ring removably connected to the bottom of the side wall by frangible means disposed radially inwardly of the outer surface of said side wall, the mold comprising female and male members, the female member including an upper assembly forming an upper portion of a socket, and a plurality of cams forming a lower portion of the socket at the location of said frangible means, the male member axially extending into the socket to form a mold cavity between the male and female members in which the cap is formed with portions of the male and female members defining inner and outer side walls of said cavity, respectively, the male member further including a first annular recess in which a radially inwardly extending annular rib of the cap is formed on the ring, the method comprising the steps of: (a) moving the upper assembly of the female member axially away from the cap while the cap remains stationary on said male member; (b) moving the cams of the female member radially outwardly and at right angles to said axia movement of the upper assembly to a position disposed away from the cap and said frangible means while said cap remains stationary on said male member; and (c) pushing a bottom edge of the cap axially upwardly away from said male member to push the annular rib out of and past the first annular recess and to remove the cap from the male member.