Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Coacting shaping surfaces
Patent
1974-05-21
1976-08-31
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Coacting shaping surfaces
72153, 425458, B29C 1700
Patent
active
039778193
ABSTRACT:
Apparatus for bending rigid extruded thermoplastic resin shapes without significant deformation of the cross-sectional configuration of the shape is described.
The bending apparatus includes a rigid die member which has a convex die surface configured to mate intimately with a portion of the cross-sectional configuration of the shape to be bent prior to and during the bending process. The convex die surface defines the desired curve to which the shape is to be bent. A flexible die is configured to mate intimately with substantially the remainder of the cross-sectional configuration of the shape. Heating fluid passages are provided through both the rigid and flexible dies for application of a heating fluid, preferably saturated steam where the shape is made of rigid vinyl, directly to the shape for conditioning of the shape for bending. The bending apparatus also includes means for forceably mating and confining the shape between the rigid and flexible dies over the length of the convex die surface defining the desired curve of the final bend.
REFERENCES:
patent: 1386068 (1921-08-01), Maynard
patent: 2182626 (1939-12-01), Fischer
patent: 2217053 (1940-10-01), Henricson
patent: 3806301 (1975-04-01), Osterhagen et al.
Charvat Robert J.
Husar Francis S.
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