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:
Mar. 08, 1988
Filed:
Sep. 29, 1986
R Jack Munsey, Caledonia, MI (US);
Leroy D DeJong, Spring Lake, MI (US);
Charles P Keip, Grandville, MI (US);
C-Tec, Inc., Grand Rapids, MI (US);
Abstract
A method for centrifugally casting a rectangular access floor panel includes the steps of forming a metal pan having a planar bottom, peripheral sidewalls and a plurality of upstanding tabs, inserting the metal pan into a cavity defined by a two-part mold and filling the pan within the mold with a concrete mixture. The mold is rotated about a vertical axis and vibrated to evenly distribute the concrete mixture within the pan. A smooth magnetic sheet is placed within the cavity. The sheet engages the planar bottom of the metal pan and prevents seepage of the concrete mixture through openings in the bottom of the pan during casting. The apparatus includes a turntable, a drive for rotating the turntable and a mold clamped to the turntable. The mold is vibrated during rotation to insure a void-free distribution of the mixture throughout the pan.