Keith L Seifert

US Patent:

52002659, Apr 6, 1993

Filed:

Jan 2, 1992

Appl. No.:

7/816686

Inventors:

Keith L. Seifert - Torrington CT
Robert E. Furst - Griswold CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

B32B 1800
B32B 704
F16C 3356

US Classification:

428325

Abstract:

A plastic part is molded of a plastic with an inner body of crystalline plastic and an outer surface layer of an amorphous plastic. The amorphous surface layer withstands friction loading at least during an initial break-in period. In one embodiment, the amorphous surface is formed by using a higher plastic melt temperature and/or a lower mold temperature than normal. In another embodiment, an intermediate part is molded as a crystalline intermediate part, and a surface layer is heated and quenched to form the amorphous surface layer on the final part. A bearing cage is molded by injecting the plastic melt at a single point intermediate the ends of a single bar of the bearing cage to permit formation of the desired amorphous layer on rails connected to the ends of the bars.

US Patent:

52232034, Jun 29, 1993

Filed:

Jun 29, 1992

Appl. No.:

7/906068

Inventors:

Keith L. Seifert - Torrington CT
Robert E. Furst - Griswold CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

B29C 4572
B29C 4573
F16C 3356

US Classification:

264241

Abstract:

A plastic part is molded of a plastic with an inner body of crystalline plastic and an outer surface layer of an amorphous plastic. The amorphous surface layer withstands friction loading at least during an initial break-in period. In one embodiment, the amorphous surface is formed by using a higher plastic melt temperature and/or a lower mold temperature than normal. In another embodiment, an intermediate part is molded as a crystalline intermediate part, and a surface layer is heated and quenched to form the amorphous surface layer on the final part. A bearing cage is molded by injecting the plastic melt at a single point intermediate the ends of a single bar of the bearing cage to permit formation of the desired amorphous layer on rails connected to the ends of the bars.

US Patent:

51820706, Jan 26, 1993

Filed:

Dec 9, 1991

Appl. No.:

7/805339

Inventors:

Keith L. Seifert - Torrington CT
Robert E. Furst - Griswold CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

B29C 4573

US Classification:

264241

Abstract:

A plastic part is molded of a plastic with an inner body of crystalline plastic and an outer surface layer of an amorphous plastic. The amorphous surface layer withstands friction loading at least during an initial break-in period. In one embodiment, the amorphous surface is formed by using a higher plastic melt temperature and/or or a lower mold temperature than normal. In another embodiment, an intermediate part is molded as a crystalline intermediate part, and a surface layer is heated and quenched to form the amorphous surface layer on the final part. A bearing cage is molded by injecting the plastic melt at a single point intermediate the ends of a single bar of the bearing cage to permit formation of the desired amorphous layer on rails connected to the ends of the bars.

US Patent:

51042410, Apr 14, 1992

Filed:

Apr 8, 1991

Appl. No.:

7/681283

Inventors:

Keith L. Seifert - Torrington CT
Robert E. Furst - Griswold CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

F16C 3356

US Classification:

384573

Abstract:

A plastic part is molded of a plastic with an inner body of crystalline plastic and an outer surface layer of an amorphous plastic. The amorphous surface layer withstands friction loading at least during an initial break-in period. In one embodiment, the amorphous surface is formed by using a higher plastic melt temperature and/or a lower mold temperature than normal. In another embodiment, an intermediate part is molded as a crystalline intermediate part, and a surface layer is heated and quenched to form the amorphous surface layer on the final part. A bearing cage is molded by injecting the plastic melt at a single point intermediate the ends of a single bar of the bearing cage to permit formation of the desired amorphous layer on rails connected to the ends of the bars.