PISTON FOR COLD-CHAMBER INJECTION MACHINES

摘要

A PISTON FOR COLD-CHAMBER INJECTION MACHINES comprising a support (2) and an external body (3) with a sealing ring (5), joined by a bayonet lock ring (6) independent of the external body (3) and divided into two parts (6a) fitted onto a groove (21) in the support (2) and connected by long screws (7) inserted into threaded holes (61). The piston preferably includes a spring bush (4) as a part that adjusts to the container, independent of the external body (3) and of the bayonet lock ring (6), under which a conical spring ring (8) is included which exerts pressure on the two parts that form the bush (4), tending to expand the same. The piston also includes alternating transverse grooves (81) along the edges thereof for receiving conical metal tips (9) inserted through holes (63) in the bayonet lock ring (6).

主权项

1. A piston for cold-chamber injection machines, which is applicable in injection machines with cylinders, and designed to move fitted to the walls of the cylinder container or sleeve, comprising, connected through at least one grub screw (10), a support (2) and an external body (3), characterised in that it includes a bayonet lock ring (6), to complement the fastening between the external body (3) and the support (2), said bayonet lock ring (6) constituting an independent piece of the external body (3). cm 2. The piston for cold-chamber injection machines, according to claim 1, characterised in that the bayonet lock ring (6) is divided into two semicircular parts (6a) that are joined to each other, and suitable to being fitted onto a groove (21) provided for this purpose in the support (2), through two long screws (7) inserted in threaded holes (61) made for this purpose in both parts of the ring.