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. 26, 1988
Filed:
Feb. 17, 1987
William G Hesterberg, Rosendale, WI (US);
Wilfred A Pagel, Fond du Lac, WI (US);
Gordon L Stiller, Omro, WI (US);
Brunswick Corporation, Skokie, IL (US);
Abstract
A lost foam casting system (2) includes a sprue (8) have a receiving portion (56) for receiving molten metal (14) from a source (16), a distribution portion (58) with a plurality of radial fingers (59-62) for distributing the molten metal (14) radially outwardly, and a lower section (63) having a plurality of feed passages (35-38) receiving molten metal (14) from the respective radial fingers (59-62) and interconnected by thin flat support walls (39-42) providing a relatively rigid structure. Workpieces (18 and 20) and in-gates (23-25 and 26-28) are connected to the flat exterior surfaces (39 and 41) of the lower section (63) of the sprue (8) and fed with molten metal (14) from respective feed passages. The structure provides pattern assembly rigidity, excellent dimensional control, high casting yield, high ratio of casting weight to gating/sprue weight, high surface area to volume ratio facilitating escape of vapor and organic effluents, ease of pattern attchment by large outer flat sprue surfaces, accessibility of casting for ease in removal from the sprue, low total volume for reduction of buoyancy, and faster metal fill rates and faster cooling.