Patent ID: 7687003
Filing Date: 2010-03-30
Classification: B29C

Abstract:
1. A method of forming a thin walled section in an injection molded plastic part comprising: providing a mold having a first mold half, a second mold half, and a slide, wherein the first mold half, the second mold half, and the slide define a mold cavity when assembled and the slide includes a double angled step that defines a thin walled section of the plastic part, the slide being movable between a retracted position wherein the double angled step that defines the thin walled section partially retracted from the mold cavity and an engaged position wherein the double angled step that defines the thin walled section is in position to define the final shape of the plastic part; injecting molten plastic into the mold cavity with the slide in the retracted position; moving the slide to the engaged position such that the double angled step forms a gradual transition to a thinnest part of the thin walled section; allowing the molten plastic to cool; opening the mold halves and removing the plastic part; and wherein each half of the double angled step is comprised of a first surface that defines a first angle with respect to the slide movement direction and a second surface that defines a second angle with respect to the slide movement direction, the second angle being greater than the first angle but less than ninety degrees, one end of each of the first surfaces defining the thinnest part of the thin walled section, an opposite end of each of the first surfaces being adjacent to one of the second surfaces.