Patent ID: 6866088

Claim:
An in-line injection molding machine for low-melting point metallic material comprising: an in-line injection mechanism comprising a tip portion, a melting cylinder, and a rear-end portion; said tip portion comprising a nozzle member disposed at a first end, a second end disposed for fluid communication with the melting cylinder, and a weighing chamber formed within the tip portion, the weighing chamber having a selected length and a diameter smaller than an inner diameter of the melting cylinder, the weighing chamber in fluid communication with the nozzle member; said melting cylinder having a supply port for a solid metal material disposed on an upper side, said melting cylinder provided obliquely with a tip portion end directed downwardly such that a molten metal in said melting cylinder flows down by self-weight to be stored in the tip portion; an agitating and injection means disposed within the melting cylinder for free rotation and axial translation, the agitating and injection means comprising: an agitating member freely rotatable in the melting cylinder, comprising: a hollow shaft freely extending a length of the melting cylinder and having a through hole at a central position, and a plurality of agitating wings formed intermittently about an outer periphery of a tip portion of the hollow shaft, the agitating wings having an external diameter approximately equal to an inner diameter of the melting cylinder, and an injection rod disposed within the through hole of the hollow shaft, an injection plunger attached unitarily to a tip of the injection rod, the injection rod freely slidable and rotatable in a central portion of the agitating member and extendable beyond the tip of the agitating member to insert into the weighing chamber, the injection plunger having an external diameter insertable into the weighing chamber with a clearance for sliding, and a sealing ring provided on an outer periphery of a tip portion of the injection plunger to prevent reverse flow of metal at injection; said rear-end portion aligned with, and spaced behind, an upward end of said melting cylinder, including a device driving said agitating and injection means; and a mold-clamping mechanism disposed external to and downward from the nozzle member of said tip portion.