Plastic article or earthenware shaping or treating: apparatus – Preform severing means – Configuration of cutting implement providing shaping cavity
Patent
1981-08-03
1982-11-23
Parrish, John A.
Plastic article or earthenware shaping or treating: apparatus
Preform severing means
Configuration of cutting implement providing shaping cavity
425306, B28B 129
Patent
active
043603335
ABSTRACT:
A machine for removing uncured concrete from the top surface of a cast concrete slab to expose the aggregate therein to provide a decorative surface finish. The machine utilizes a pair of counter-rotating brushes to remove concrete which has been prevented from setting by use of a surface retarder, thereby exposing the aggregate to leave an attractive exposed aggregate finish. The counter-rotating brushes deposit the uncured concrete brushed from the surface of the slab onto a conveyor which carries the concrete waste to the edge of the slab for disposal.
REFERENCES:
patent: 3469000 (1969-09-01), Smith
patent: 3775529 (1973-11-01), Steenson
Fox Lonnie G.
Hanson David W.
Nash Richard C.
Fabcon Incorporated
Parrish John A.
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