Patent ID: 6520766
Filing Date: 2003-02-18
Classification: B29C

Abstract:
A mold locking device for a molding machine, comprising:(a) a toggle assembly, including: two first toggle arms, said first toggle arms being pivoted to an inner side of a bearing disc of said molding machine fixedly disposed on one end of said molding machine; two second toggle arms, said second toggle arms being each pivoted to a respective one of said first toggle arms from an outer end thereof; two third toggle arms, said third toggle arms being each pivoted to an intermediate portion of a respective one of said second toggle arms from a first end thereof, each of said third toggle arms having a second end pivoted to a co-moving disc of said molding machine movable along tie bars of said molding machine, said second toggle arms being movably passed through said co-moving disc, said co-moving disc having a nut rotatably disposed at a central portion thereof, two connecting arms, each of said connecting arms being pivoted to an inner end of a respective one of said second toggle arms from one end thereof, each of said connecting arms having a second end pivoted to a movable mold base of said molding machine movable along said tie bars and, (b) a transmission member, including: a power source fixedly fitted to said molding machine; an elongated screw rotatably passing through said nut and said co-moving disc, said elongated screw being connected to said movable mold base from an inner end thereof; a connecting member connecting said power source to said nut, said nut being rotated relative to said elongated screw by said connecting member driven by said power source when said transmission member is started, said nut being capable of moving rearwardly along said elongated screw when being turned in a first direction to thereby push said co-moving disc and said movable mold base forward, said toggle assembly being pulled to a mold closing position by said movable mold base being pushed forward where said first, said second and said connecting toggle arms are aligned and said third toggle arms are pushing said co-moving disc forward.