Plastic article or earthenware shaping or treating: apparatus – Means withdrawing trowel type shaping member from within...
Patent
1986-03-06
1987-09-01
Hoag, Willard E.
Plastic article or earthenware shaping or treating: apparatus
Means withdrawing trowel type shaping member from within...
425328, 425418, 425427, 425429, 425447, 425460, 425471, B28B 2124
Patent
active
046906312
ABSTRACT:
A packerhead concrete pipe making machine having a rotatable packerhead operable to form a concrete pipe in an upright cylindrical mold about a wire cage. The packerhead has a plurality of rollers rotatably mounted on a circular plate operable to pack concrete into a cylindrical shape in the mold. Each roller has an outer sleeve of elastic rubber material. A cylindrical wall secured to the plate supports an annular troweling member operable to finish the inside surface of the concrete pipe.
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Hoag Willard E.
Hydrotile Machinery Company
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