Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Rod or tubular preform
Patent
1974-11-29
1976-06-29
Baldwin, Robert D.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Rod or tubular preform
264334, 249180, 425438, 425DIG218, B29C 1702
Patent
active
039663850
ABSTRACT:
Apparatus 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 apparatus 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. When the segments are in the contracted positions they do not extend radially outwardly of the annular surface, and the surface and segments may be withdrawn from the molded tubular part by movement along the longitudinal axis.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 Then, these withdrawn segments move axially relative to the remaining segments and the latter segments themselves withdraw from the groove.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 et al.
patent: 3557278 (1971-01-01), Kuhlemann
Ashen Robert M.
Baldwin Robert D.
Charvat Robert J.
Schaap Robert J.
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