Hydraulically actuated mechanical rock excavator

Details Hydraulically actuated mechanical rock excavator Hydraulically actuated mechanical rock excavator

1990-01-08

1991-05-14

Britts, Ramon S.

Mining or in situ disintegration of hard material

Expansible breaking-down devices

Fluid-pressed element

299 23, E21C 3702

Patent

active

050150391

ABSTRACT:
An apparatus (10) for placing a hard compact material such as rock surrounding a drill hole into axial tension for the purpose of breaking and excavating the material by virtue of a dual piston (23) and (25) arrangement disposed within a fluid cylinder (16) wherein the first piston (23) is attached to a thrust rod member (28) the second piston is attached to a wedge member (30) having an outwardly tapered conical end (34) and a feather member (40) surrounding the wedge (30) and thrust (28) members; wherein the feather segments (43) have a conical profile on both their internal and external peripheries.

REFERENCES:
patent: 3565488 (1971-02-01), Walsh
patent: 4099784 (1978-07-01), Cooper
patent: 4152028 (1979-05-01), Allen

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