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. 29, 1999
Filed:
Sep. 06, 1996
Steven Charles Dubay, Rockford, MI (US);
Thomas Keith Langejans, Holland, MI (US);
Robert Edward Bloomfield, Holland, MI (US);
Daniel Robert Athey, New Zeeland, MI (US);
William Keith Boezwinkle, Grand Haven, MI (US);
Mark Allan Craycraft, Holland, MI (US);
Donnelly Corporation, Holland, MI (US);
Abstract
A high pressure mold assembly and method for holding a sheet of material such as glass while molding a gasket or other molded portion on the sheet from a thermoplastic or other moldable material such as PVC at high pressures of at least 2000 psi. The assembly and method provides an improved holding feature which reduces the percentage of broken sheets of material and yet controls the flash or overflow of the moldable material out of the mold cavity. The mold assembly includes a first mold section and a second mold section. The first mold section includes a first seal receiving surface which receives a first resilient seal while the second mold section has a second seal receiving surface which receives a second resilient seal. The seals engage and hold the sheet therebetween and accommodate variations in the sheet. Each of the seals is adapted to press and seal against the sheet for preventing the flow of the molten material along the sheet while under high pressure of between about 2,000 psi and 5,000 psi. The seals are each protected from the high pressure by a shoulder spacing the seal from the mold cavity. The shoulder is spaced from the sheet by a small gap preferably within the range of between about 0.007 and 0.013 inches. The method includes providing a high pressure injection mold assembly, the mold assembly having first and second mold sections and first and second resilient seals as described above. The sheet of material is held between the seals to avoid breakage and accommodate variations while the seals are protected by positioning them adjacent shoulders which prevent seal blow-out. Preferably, the seals are formed from urethane, polyethylene terephthalate or silicone rubber.