Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Patent
1976-03-01
1977-08-23
Purser, Ernest R.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
E02D 1713, E01C 2309
Patent
active
040436012
ABSTRACT:
A cutting device is disclosed having an angled lifter blade with flat co-planar keepers on each side which is adapted to pass through or under a layer of asphalt or soil cement and cut a narrow trench without disruption or upheaval of the side edges of the trench. The cutting device is carried by a prime mover and is capable of making a clean cut or trench through asphalt layers of various thicknesses along straight or curved paths of travel. The side keepers may be vertically adjustable along a supporting shank in relation to the lifter blade and the length of the blade may be varied to adjust to differing thicknesses of the layer to be cut. The side keepers are spaced from each other by the sides of the lifter blade to define therewith a pair of cutting edges, one of which is at an angle to the horizontal or grade of the asphalt layer and the other of which is substantially flush with the top surface of the asphalt. The keepers being flush with the two surfaces of the asphalt immediately in the vertical line of the cut prevent any upheaval along the cutting edges. The angle of the lifter blade to the keepers is preferably about 40.degree..
REFERENCES:
patent: 970818 (1910-09-01), Harryman
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patent: 2689419 (1954-09-01), Daniels et al.
patent: 2783699 (1957-03-01), Kelly
patent: 2878002 (1959-03-01), Haley
patent: 2984029 (1961-05-01), Pederson
patent: 3268012 (1966-08-01), Ratkowski
patent: 3592509 (1971-07-01), Soderlund
patent: 3885833 (1975-05-01), Lemieux
Pate III William F.
Purser Ernest R.
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