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:
May. 02, 1989
Filed:
Jun. 24, 1988
Applicant:
Inventors:
Karl D Voss, Standish, MI (US);
James B Mercer, Saginaw, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
164255 ; 164306 ; 164341 ;
Abstract
Apparatus for the vacuum countergravity casting of metal in shell molds including a gas-permeable upper shell mold portion secured to a bottom mold portion and together secured to the mouth of a vacuum box by a plurality of threadable mounting sites engaged by self-tapping threads on the ends of rotatable shafts reciprocally slidable through the ceiling of the box. Each shaft has a stop fixed thereto at a predetermined distance above the threads for pressing the upper shell mold portion into sealing engagement with the bottom mold portion in order to eliminate the need to glue the upper and lower mold portions together.