Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1976-04-29
1977-08-23
Kucia, Richard R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264296, 264322, B29C 114, B29C 114
Patent
active
040440923
ABSTRACT:
A method for molding, in a single integrated operation, a tubular part having an internal recess which may take the form of a groove extending completely around the inside of the part for receipt therein of an O-ring or the like. The method utilizes an apparatus which comprises a core assembly having a longitudinal axis, and base means movable along the axis and defining an annular outer mold surface for forming of the interior wall of the tubular part. The core assembly further includes a plurality of groove-forming segments carried on the base means adjacent to the annular surface and movable between first contracted positions and second expanded positions. In accordance with the method, when the segments are in the contracted positions they do not extend radially outwardly of the annular surface, and the segments may be withdrawn from the molded tubular part by movement along the longitudinal axis. The segments are movable, incident to movement of the annular surface into the mold cavity, to the radially expanded molding positions wherein they extend substantially radially outwardly from the annular surface. The segments are mechanically locked in the radially expanded positions during molding of the tubular part. After the part is molded, some of the groove-forming segments are moved radially inwardly to withdraw them from the molded groove. Then, these withdrawn segments move axially relative to the remaining segments and the latter segments themselves withdraw from the groove. The segments are configured and arranged so that some can move radially inwardly from the expanded positions. Thus, deep, circumferential grooves can be molded in a tubular part as part of the basic molding of the part, and without requiring a secondary operation.
REFERENCES:
patent: 3205535 (1965-09-01), Niessner
patent: 3484900 (1969-12-01), Sands
patent: 3557278 (1971-01-01), Kuhlemann
patent: 3749543 (1973-07-01), Stansbury
patent: 3861847 (1975-01-01), Barnett
Kucia Richard R.
Schaap Robert J.
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