Mining or in situ disintegration of hard material – Hard material disintegrating machines – Rotary cutter head with advance direction coincident or...
Patent
1975-01-10
1977-03-01
Purser, Ernest R.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Rotary cutter head with advance direction coincident or...
173 36, 175 94, 175101, 175325, E21D 902
Patent
active
040099091
ABSTRACT:
A boring assembly is advanced upwardly by thrust rams acting on a column guided traveling cross frame connected to the power tunneler from below by a non-rotating sectional support column. The support column is anchored to a holding table situated underground above the thrust ram while sections are being added to or removed from it. The boring assembly is driven by either a hydraulic motor housed in the cross frame, via a sectional drill stem housed within the support column, or by a hydraulic motor housed directly within the boring assembly.
REFERENCES:
patent: 2558068 (1952-03-01), Williams et al.
patent: 2633334 (1953-03-01), Lavender
patent: 2647726 (1953-08-01), Kirk
patent: 3123161 (1964-03-01), Weber
patent: 3354969 (1967-11-01), Ebeling
patent: 3604754 (1971-09-01), Emden et al.
patent: 3695718 (1972-10-01), Lauder
patent: 3840272 (1974-10-01), Crane et al.
Adami Hans A.
Robbins Richard J.
Pate III William F.
Purser Ernest R.
The Robbins Company
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