The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 1992
Filed:
May. 29, 1992
Jens O Sorensen, Rancho Santa Fe, CA (US);
Primtec, Rancho Santa Fe, CA (US);
Abstract
The dimensions of a plastic product are controlled while injection molding the product in a mold cavity of a mold comprising a core section and a cavity section, separated by a parting line and defining the mold cavity. In one method the mold cavity wall thicknes is controlled during an injection of a first quantity of plastic material by locking the core section to impede lateral movement thereof by means of contact between a non-perpendicular contact surface of a protracted contact element of one mold section and an associated non-perpendicular contact surface of the other mold section, and is further controlled during an injection of a second quantity of plastic material, which occurs a predetermined period after discontinuing the flow of plastic material into the mold cavity and after the contact element has been retracted, by locking the core section to impede lateral movement thereof by means of a at-least-partly-solidified wall sections having a controlled thickness formed during the injection of the first quantity of plastic material. In another method, the mold cavity wall thickness is controlled during an injection of a first quantity of plastic material, which does not completely cover the parting line of the mold, by locking the core section to impede lateral movement thereof by means of contact between a non-perpendicular contact surface of a protracted contact element of one mold section and an associated non-perpendicular contact surface of the other mold section, and is further controlled during an injection of a second quantity of plastic material, which occurs after the contact element has been retracted, by locking the core section to impede lateral movement thereof by means of at-least-partly-solidified wall sections having a controlled thickness formed during the injection of the first quantity of plastic material.