Mining or in situ disintegration of hard material – Processes – Forming blocks
Patent
1988-02-03
1989-05-23
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Processes
Forming blocks
125 21, 299 35, B28D 108, F21C 2520
Patent
active
048324116
ABSTRACT:
The invention relates to a method of cutting an interior surface in reinforced concrete. Holes are drilled to define the shape of the concrete (usually a rectangular block) to be removed, these can be drilled to any suitable depth, which was not possible under prior art methods. Slots are cut between the holes except at one side using an endless wire saw. An interior cut is made using the endless wire saw from the periphery to the uncut side. The wire saw is secured in the cutting operations at the interior end of the holes by swivel pulleys secured at the exterior end of the holes to the concrete surface. The invention also relates to a swivel pulley assembly especially adapted for application in the method. The invention further relates to a method of cutting a substrate by allowing the wire saw to cut between two pulleys interior of the substrate, from a nonlinear path between the pulleys to a line connecting the pulleys.
REFERENCES:
patent: 558483 (1896-04-01), Clark
patent: 2050761 (1936-08-01), Newson
patent: 2577545 (1951-12-01), Stratton
patent: 4674474 (1987-06-01), Baril
patent: 4735188 (1988-04-01), Kubo
Johnston Edward P.
Johnston John D.
Bagnell David J.
Bailey Robert W. B.
Novosad Stephen J.
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