Injection-molding machine with transverse feed

Claim 1

An injection-molding machine comprising a plurality of mold plates relatively movable between an open-mold and a closed-mold position along an axis perpendicular to their major surfaces, at least one of said mold plates being provided with inlet means leading from an edge thereof to a cavity formed therein, drive means for relatively moving said mold plates along said axis, a source of hardenable plastic mass under pressure, injection means offset from said axis including nozzle means alignable with said inlet means in said closed-mold position, said injection means including a heated conduit communicating intermittently with said source and forming an internal seat for said nozzle means, the latter being outwardly displaceable from said conduit under pressure of said mass against said seat in a direction generally transverse to said axis, positioning means synchronized with said drive means for aligning said nozzle means with said inlet means in said closed-mold position preparatorily to establishment of communication of said conduit means with said source for admitting a flow of said mass through said inlet means into said cavity, biasing means effective upon a cessation of said pressure to withdraw said nozzle means into said conduit from said inlet means prior to separation of said mold plates, and plug means in said injection means engageable with said nozzle means upon such withdrawal for blocking the further outflow of said mass therefrom.