Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1993-01-14
1994-02-15
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
249100, 264 71, B28B 108, B28B 300, B28B 720
Patent
active
052864405
ABSTRACT:
A method and apparatus for the production of a symmetrical oval concrete pipe including an oval male joint member and an oval female joint member formed on opposite ends of an oval pipe body including an outer jacket and an inner core disposed in spaced relationship relative to each other to form the oval pipe body therebetween; an upper pallet and a lower pallet configured to form the oval male joint member and the oval female joint member respectively, and a pallet positioning structure configured to engage the upper pallet and the lower pallet to operatively position the upper pallet and lower pallet relative to the outer jacket and inner core such that corresponding points on the upper pallet and the lower pallet are aligned relative to each other whereby corresponding points of the oval male joint member and the female joint member are aligned relative to each other.
REFERENCES:
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patent: 3584356 (1971-06-01), Joelson
patent: 3922133 (1975-11-01), Crawford et al.
patent: 4039642 (1977-08-01), Steiro
patent: 4123033 (1978-10-01), Joelson
patent: 5215673 (1993-06-01), Beacom
Aftergut Karen
Fisher III A. W.
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