Joseph J Ferraro

US Patent:

43199500, Mar 16, 1982

Filed:

Mar 31, 1980

Appl. No.:

6/135565

Inventors:

John L. Sznopek - Littleton CO
Charles Lostak - Littleton CO
Robert W. Heisler - Littleton CO
Joseph P. Ferraro - Littleton CO
Henry J. Kazienko - Littleton CO

Assignee:

Manville Service Corporation - Denver CO

International Classification:

B29C 100
B29D 2312

US Classification:

156475

Abstract:

Mandrel for making a coupling which coupling comprises a body of fiber glass reinforced plastic which has a rubber sleeve embedded therein. The rubber sleeve is a one piece unit which includes specially shaped sealing gaskets on either end and has a rubber liner spanning the area between these sealing gaskets. This rubber sleeve is stretched onto a steel and plastic molding mandrel. This stretching places the rubber liner under tension which reduces the cross-sectional area of the liner and compensates for thermal expansion of the liner during curing. The mandrel/sleeve combination is rotated in order to wind a thermosetting resin impregnated fiber glass roving around the outer circumference of the mandrel/sleeve combination, thus embedding the sleeve in the fiber glass reinforced resin matrix. The thermosetting resin is cured at elevated temperatures, hardening into a rigid coupling with the embedded rubber sleeve integral therewith. Thereafter the hardened coupling is stripped from the steel and plastic mandrel and subjected to a further curing and finishing operation.

US Patent:

43291937, May 11, 1982

Filed:

Mar 31, 1980

Appl. No.:

6/135566

Inventors:

John L. Sznopek - Littleton CO
Charles Lostak - Littleton CO
Robert W. Heisler - Littleton CO
Joseph P. Ferraro - Littleton CO
Henry J. Kazienko - Littleton CO

Assignee:

Manville Service Corporation - Denver CO

International Classification:

B65H 8100
F16L 2102

US Classification:

156162

Abstract:

A coupling comprises a body of fiber glass reinforced plastic which has a rubber sleeve embedded therein. The rubber sleeve is a one piece unit which includes specially shaped sealing gaskets on either end and has a rubber liner spanning the area between these sealing gaskets. This rubber sleeve is stretched onto a steel and plastic molding mandrel. This stretching places the rubber liner under tension which reduces the cross-sectional area of the liner and compensates for thermal expansion of the liner during curing. The mandrel/sleeve combination is rotated in order to wind a thermosetting resin impregnated fiber glass roving around the outer circumference of the mandrel/sleeve combination, thus embedding the sleeve in the fiber glass reinforced resin matrix. The thermosetting resin is cured at elevated temperatures, hardening into a rigid coupling with the embedded rubber sleeve integral therewith. Thereafter the hardened coupling is stripped from the steel and plastic mandrel and subjected to a further curing and finishing operation.