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:
Apr. 24, 2001
Filed:
Mar. 19, 1999
Steven L. Johnson, East Claridon, OH (US);
Nitrojection Corporation, Middlefield, OH (US);
Abstract
A readily replaceable pin-in-sleeve device (A, B) for gas-assisted injection molding is used with a two-part mold to form an injection molded product from a plastic material. A sleeve (,) has a threaded exterior surface that is shaped to be received in a socket (,) of a mold member (,) opening into a mold cavity. A longitudinally extending bore (,) extends through the sleeve. The bore has a first portion (,) adjacent the cavity, and a second, larger diameter portion (,), spaced from the cavity. A pin (,) extends through the sleeve and has a forward section and an enlarged base, which are received in the bore first and second portions, respectively. A tortuous path for an injection fluid is defined between the pin and the bore to inhibit transport of plastic material into the device when the injection fluid is vented from the mold cavity. A filter,positioned in the bore, behind the pin, filters traces of plastic material from the vented injection fluid. A simple tool, such as a socket wrench, quickly unscrews the device from the mold member.