US Patent 7357172 Check valve with a spiral coil seal

Patent 7357172 was granted and assigned to Husky Injection Molding Systems on April, 2008 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Husky Injection Molding Systems

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7357172

Date of Patent

April 15, 2008

Patent Application Number

10876584

Date Filed

June 28, 2004

Patent Primary Examiner

‌

Kevin P. Kerns

Patent abstract

A seal for a check valve for a metal molding machine. The seal is provided by the combination of a peripheral groove in an outer surface of the check valve and a helically wound core in the groove. The helically wound coil is expandable into sealing engagement with a cylindrical wall of the molding machine. The helically wound coil may be movable laterally in the groove between a melt channel open position and a melt channel closed position to open or seal the melt channel.