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:
Jun. 06, 1989
Filed:
Oct. 19, 1988
Barry L Priem, Bedford, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A gas removal system for a mold cavity of a die casting or other molding machine includes a valve movable to an open position to interconnect the mold cavity to a gas venting or evacuating device or to a closed position. A portion of the valve is movable relative to a fluid pressure supply inlet port to establish a first pressure condition represented by back pressure in the supply line when the valve is in one of the open or closed positions and a second pressure condition represented by substantial absence of back pressure in the supply line when the valve is in the other of those positions. The presence or absence of back pressure in the supply line is sensed to determine valve position. A control unit compares the second valve position and a scheduled valve position and indicates when the valve is improperly positioned to prevent injection of a melt into the mold cavity.