Precision neck construction for center lock captive closure

Claim 1

A neck element for a center-lock captive closure, said neck element comprising: injection-molded thermoplastic material, thereby to insure precise dimensional tolerances thereof, a tubular body portion terminating in an orifice adjacent the upper end thereof, an imperforate plug disposed centrally of said orifice and extending above and below said body portion upper end, an annular wall portion disposed in circumambient spaced relation to said plug, said wall portion at its lower end being inturned toward said plug intermediate the plug length and integrally connected therewith, thereby to support said wall portion in spaced relation to said plug and define an annular recessed area therebetween, and, a plurality of webs extending substantially radially between and interconnecting said plug and surrounding wall portion with said tubular body portion, thereby to define a plurality of elongated dispensing passages, the upper end of said tubular body portion, the upper end of said circumambient wall portions, and the top surfaces of said webs (constituting sheared planar surfaces) lying in a common plane.