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:
Feb. 03, 1976
Filed:
Aug. 14, 1974
Bernie A Olmsted, East Longmeadow, MA (US);
Package Machinery Company, East Longmeadow, MA (US);
Abstract
A rotating feed screw in the barrel of an injection molding machine is fitted with a collar with peripheral grooves through which the plasticized material is fed into a charge forming chamber. The collar is held onto the end of the feed screw by an elongated torpedo body, which body has a first portion for receiving the annular collar, a second portion which defines a plurality of helically oriented crisscrossing grooves in its cylindrical surface, and a third axial portion which defines a raceway for a plurality of spherical roller elements. A nonreturn valve in the form of an annular shuttle is slidably received on the second axial portion, and also slidably received in the bore which rotatably receives the screw, so that the plasticized material is required to pass through the above mentioned grooves and around the ball elements. Thus, the ingredients are mixed in several stages prior to being injected through a nozzle provided in the head of the barrel, into the mold cavity.