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:
Sep. 02, 1986
Filed:
May. 21, 1985
Alfons Kobel, Karlsruhe, DE;
Norbert Damm, Karlsdorf, DE;
Werner Geiger, Pfinztal, DE;
Gunter Muller, Karlsruhe, DE;
BMD Badische Maschinenfabrik Durlach GmbH, Karlsruhe, DE;
Abstract
In a process for compacting foundry mold making material, that is loosely heaped in a closed mold space over a pattern, the surface of the material is acted on by a compressed gas with a pressure of at the most 8 bar. This gas is caused to undergo expansion out of an inlet space through a valve in an opening at a gas flow rate of over 50 kg/sec and with a pressure increase rate of over 300 bar/sec, into the mold space. The maximum pressure in the inlet space or antichamber is 20 bar. An apparatus for use in the method is made up of a pressure vessel, a mold flask placed thereunder having a filling frame and a pattern plate. The opening cross section of the valve is 50 to 150% of the horizontal cross section of the mold flask and is opened in a short time of the order of milliseconds.