Tradesco Mold Limited

Vince Travaglini

Donald L Hersey

Juan Fernando Segovia

The invention provides a motion transfer mechanism for transferring motion between a first and second component, the mechanism comprising an elongate track mounted to the first component, the track having a polar axis and an external actuation surface along a portion of the length of the track, the track having at least one portion of the actuation surface inclined at a predetermined spiral angle about the polar axis; track riding device, mounted to the second component in guided contacting relation with the actuation surface, for longitudinal displacement relative to the actuation surface, and for predetermined rotational displacement in response to the longitudinal displacement, the track riding device comprising: an actuating surface follower mounted within a rider housing; and biasing device disposed between the follower and the housing for resiliently urging the follower into continuous engagement with the actuation surface; track mounting device for mounting the track to the first component in predetermined axial relation relative to the track riding device; and actuating device for producing relative longitudinal displacement between the first and second components thereby transferring the longitudinal displacement into the rotational displacement of the track riding device. Preferably the follower includes sliding device for sliding the follower within the housing transversely relative to the polar axis of the track. A roller is disposed within the sliding device and the biasing device includes adjustment device for varying resilience. In a preferred embodiment, biasing device comprise a washer spring and the adjustment device comprise a shim, the track has two actuating surfaces and the housing includes two assemblies of the rollers, sliding device, springs and shims disposed in opposition relative to each other.

Motion transfer mechanism

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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Etobicoke, Canada

Vince Travaglini