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:
Jan. 20, 2004
Filed:
Dec. 19, 2000
Yuji Hayashi, Sakaki-machi, JP;
Mamoru Miyagawa, Sakaki-machi, JP;
Nissei Plastic Industrial Co., Ltd., Nagano-ken, JP;
Abstract
An injection molding screw prevents materials from being left and reduces friction by limiting the end position of the screw flight in relation to the position of the feeding opening in the heating cylinder. The screw is rotationally and movably provided in the heating cylinder having a nozzle at a tip end. Granular metals fed from a feeding opening at the rear of the heating cylinder are transferred forward by the screw rotation and melted. Melted metals are injected from the nozzle by forward movement of the screw. A rear end of the screw flight is positioned below the rear edge of the feeding opening at the rearmost position of the screw. At the foremost position of the screw, the rear end is positioned in front of the feeding opening to close the feeding opening by the rear portion of the axial portion of the screw axis.