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. 30, 1999
Filed:
Apr. 16, 1996
Thomas P Schneider, Canton, MI (US);
John L Jorstad, Richmond, VA (US);
CMI International, Inc., Southfield, MI (US);
Abstract
A composite metallic cast article (A) includes a shell (28) having a predetermined solid phase density. A non removable insert (24) is at least partially embedded within the shell (28). The insert (24) is fabricated from a foamed metal substance having a substantially lower solid phase density than the shell (28). The foamed metal insert (24) may have a layer of skin (26) fused with the molten metal of the shell (28) during the casting process. Tapered locating pins (30) or other spacing elements position the insert (24) within the mold cavity (18) to prevent shift during the casting operation. The foamed metal insert (24) reduces the time and expense involved in removing a traditional casting core after the casting operation is complete. Also, the insert (24) can be completely enclosed within the shell (28) of the article (A), thereby expanding the design capabilities of such cast articles (A). Furthermore, the foamed metal insert (24) provides better stiffness and energy absorbsion to the cast article (A) when compared with a hollow cavity section formed by a core of the prior art.