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:
Nov. 07, 1995
Filed:
Jan. 31, 1995
David Brown, Brampton, Ontario, CA;
Harald Gaul, Thornton, Ontario, CA;
Yosif Kushnir, Willowdale, Ontario, CA;
Nick Travaglini, Woodbridge, Ontario, CA;
Victor Wilson, Bondhead, Ontario, CA;
Other;
Abstract
An injection mold for use with a molding press has four mold levels in axially stacked relation, permitting a substantial doubling of output for a given size of press as compared with a back-to-back two level stacked mold. The mold feeder flow path extends axially from the injector head to a flow distribution block located at the centre of the stacked mold block series. The centrally located distribution block is connected, in sealed relation with the injector head, being axially displaceable therefrom in continuing sealed relation upon the opening of the mold. A drool prevention valve system, located at two of the mold interfaces, to preclude drooling of fluid plastic stock upon opening of the molds includes pressure fluid actuators for operating the valves, wherein the pressure fluid may comprise the fluid plastic stock. The valve system also includes a depressurizing valve provision, wherein, upon opening of the mold interfaces the stock distribution passages are substantially depressurized, to thereby reduce any tendency to drool. The mold includes axial adjustment means to compensate for differential variations in overall mold length within the press, due to changes in effective mold temperature.