Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Removing surface portion of composite workpiece to expose...
Patent
1978-01-23
1980-01-29
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Removing surface portion of composite workpiece to expose...
264 70, 264145, 264162, 264163, 264177R, 264228, 264233, 264293, 264296, B28D 126, B28B 129
Patent
active
041861663
ABSTRACT:
Method and apparatus for producing a concrete panel having a fractured rib finish is disclosed. A quantity of relatively low slump concrete mixture is cast upon a pallet in the form of a panel and is extruded to define projecting ribs and channels. The casting is permitted to harden until the concrete becomes rigid but not completely set. Thereafter an array of wedges secured to a carriage assembly is drawn along the length of the panel with each wedge disposed in shearing engagement with edge portions of an adjacent pair of ribs. Each wedge includes a shoulder portion wider than the channel for shearing and forcibly displacing portions of the ribs as the wedge is drawn through the channel. Means are provided for propelling the carriage assembly along the length of the panel and in a direction parallel to the orientation of the ribs. A concrete panel having a fractured rib finish produced by the method of the invention is similar in appearance to a concrete panel having a manually hammered rib finish.
REFERENCES:
patent: 3049786 (1962-08-01), Jones
patent: 3061904 (1962-11-01), Wise
patent: 3142106 (1964-07-01), Wise et al.
patent: 3348279 (1967-10-01), Shoe
patent: 3545140 (1970-12-01), Jones
patent: 3770360 (1973-11-01), Shoe
patent: 3775529 (1973-11-01), Steenson
patent: 3821347 (1974-06-01), Katoh
patent: 3867503 (1975-02-01), Shoe
Martin Concrete Engineering Company
Pavelko Thomas P.
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