Patent ID: 6668816
Filing Date: 2003-12-30
Classification: B28D

Abstract:
A concrete stone facing machine comprising means to convey a stone having opposed flat surfaces to a pitching station where a predetermined one of said surfaces of said stone is to be pitched to form a deep irregular rough surface to resemble a real stone face, at least one pair of opposed pitching blade assemblies are aligned in a common plane on a respective side of said pitching station, means to displace each said pitching blade assemblies towards and away from one another, each said pitching blade assemblies having a plurality of pitching blades secured in side-by-side aligned relationship, each said pitching blades having a forward projecting cutting edge and a securing body portion, a first group of said pitching blades having their cutting edges aligned with a first straight cutting axis which is offset from the cutting edges of a second group of pitching blades aligned along a second straight cutting axis, said first and second cutting axes being parallel to one another, said means to convey being a feed conveyor for feeding concrete stones to a loading station adjacent said pitching station, stop means to arrest a concrete stone to be pitched in alignment with said pitching station, pusher means to transfer said stone to be pitched from said stop means to a support platform of said pitching station with a face of said stone to be pitched projecting a predetermined distance beyond said common plane, clamp means to clamp said stone to be pitched on said support platform, and stop means to arrest the penetration of said, pitching blades in surrounding surfaces of said block to limit the penetration thereof to a preset distance.