B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/702
B29C 45/28 (2006.01)
Patent
CA 1072280
Abstract A nozzle to he connected between a conventional molding machine and a mold cavity for injecting molten resin of thermoplastics into a mold cavity of runnerless type where a gate at the front end of a cylinder of the nozzle opens and closes automatically according to the pressure of molten resin. A differential moving piston slidably disposed in the cylinder comprises a front piston and a rear piston mounted on the front end and the rear end thereof respectively, a passage for molten resin axially drilled therethrough and a needle protruding forward from the front end of the front piston for mating with the gate according to the sliding movement thereof. A spring disposed in the cylinder pushes the differential moving piston forward to close the gate. Herein said front piston is larger in its effective area functioning as a piston head than that of said rear piston so that when the pressure of molten resin increases the differential moving piston slides backward to open the gate against the spring by the backward pushing differential force between the total pressure on the front piston and the total pressure on the rear piston.
229481
Kato Masanori
Saito Toshio
Sakurai Osamu
Kato Masanori
Na
Saito Toshio
Sakurai Osamu
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