Stone working – Dressing
Patent
1977-04-06
1978-05-09
Whitehead, Harold D.
Stone working
Dressing
125 23R, 225103, B28D 100
Patent
active
040881121
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: 1496522 (1924-06-01), Canning
patent: 3224064 (1965-12-01), Hummel
patent: 3550575 (1970-12-01), Metzger
patent: 3606470 (1971-09-01), Blum
Martin Concrete Engineering Company
Whitehead Harold D.
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