Method of molding a composite plastic article
AssigneeThe Grigoleit Company
InventorRobert K. Howie, Jr.
Life of this patent
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Abstract
A method of molding a composite plastic article having a cylindrical transverse cross section. The method includes the steps of forming an inner core of a cylindrical transverse cross section having a longitudinally extending hub, an outer wall surrounding the hub and ribs extending between the hub and the outer wall. A plurality of openings are formed extending through the outer wall with the openings accessible between the hub and the outer wall. A soft, resilient plastic is injection molded through only one of the plurality of openings to form an outer covering on the outer wall and to fill the other openings which extend through the outer wall.
Claims2
A method of molding a composite plastic article having a cylindrical transverse cross section including the steps of:
- forming an inner core of a cylindrical transverse cross section having an elongated hub with a front portion and a rear portion, an outer wall surrounding said front portion of said hub, said outer wall having a front surface and a rear surface, a plurality of ribs extending radially between said hub and said outer wall with said ribs terminating rearwardly of said front portion of said hub, and a plurality of openings extending through said outer wall with each opening located between a pair of said ribs,
- injection molding a soft, resilient plastic between only one pair of said ribs at the rearwardly termination of said pair of ribs to flow said soft, resilient plastic through said opening located between said only one pair of ribs to said front surface of said outer wall to form a soft, resilient plastic outer covering on said outer wall of said core and to flow said soft, resilient plastic back through said other openings to interlock said soft, resilient plastic outer covering and said core, and
- controlling the back flow of said soft, resilient plastic from said front surface of said outer wall where it forms said outer covering through said other openings to fill said other pairs of ribs to their rearwardly terminations.
A method of molding a composite plastic article having a cylindrical transverse cross section including the steps of:
- forming an inner core of a cylindrical transverse cross section having an elongated hub with a front portion and a rear portion, an outer wall surrounding said front portion of said hub, said outer wall having a front surface and a rear surface, a plurality of ribs extending radially between said hub and said outer wall with said ribs terminating rearwardly of said front portion of said hub, and a plurality of openings extending through said outer wall with each opening located between a pair of said ribs, and
- injection molding a soft, resilient plastic between only one pair of said ribs at the rearwardly termination of said pair of ribs to flow said soft, resilient plastic through said opening located between said only one pair of ribs to said front surface of said outer wall to form a soft, resilient plastic outer covering on said outer wall of said resilient plastic outer covering and sad core, and
- controlling the back flow of said soft, resilient plastic from said front surface of said outer wall to limit coverage of said rear surface of said outer wall by said soft, resilient plastic.
Dependencies are inferred from the claim text.