Importance

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Abstract

The nozzle tip of an injection mold, which admits plastic at high injection pressures and temperatures to the gate of the mold, is locked on its seat within the nozzle housing by way of an axially elongated bridging key arrangement, to lock the nozzle tip to the nozzle housing and preclude backing-off movement of the nozzle tip into the gate. This prevents the nozzle tip from moving to block or partially block-off the gate. By securely locking the nozzle tip, potential damage to the mold gate is avoided. A singular keyway comprising aligned keyway portions may be provided, in mutual radial facing relation, to receive an elongated key therein. A differentiated nozzle tip locking embodiment provides two annular arrays of complementary keyway halves in mutual facing relation, forming potential insertion keyways in differentiated matching relation to provide one almost perfect match-up between two halves of a keyway, for insertion of a tubular spring pin as a key in locking relation therein. Adjacent pairs of potential keyway halves may be in progressive near alignment, so as to ensure a near-perfect keyway alignment match-up, thereby enabling the insertion of a key, such as a locking pin member, to maintain the nozzle tip in a screwed-home condition.

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First Claim