UNDERCUT TREATING DEVICE FOR INJECTION MOLDING ARTICLE

摘要

An under-cut treating device of an injection mould includes a pinion (12) inserted in a shaft and a rack (14) to be engaged with the pinion in between a stationary plate and a moveable plate. Circular arc shape space and guide groove concentric to the space are formed on the contacting surfaces of both the stationary and moveable plates. The circular arc shape core (5) inserted in the circular arc shape space is connected to the shaft of the pinion by a connecting arm (9). By using this device the performance of forming and removing tubular products or circular arc shape products in an injection moulding process comes to be efficient.