Drill deck bushing

Details Drill deck bushing Drill deck bushing

1989-03-30

1990-07-24

Hannon, Thomas R.

Bearings

Rotary bearing

Antifriction bearing

384 24, 384 29, 384 97, 175220, F16C 3334, F16C 3100

Patent

active

049431722

ABSTRACT:
A shock absorbing roller deck bushing for rotary blast hole drills has a steel inner liner with a cylindrical axial bore for receiving a drill string. The liner is rotatably disposed within an outer shell mounted in the drill deck. A split retainer plate is attached to the outer shell and has an inwardly projecting flange around its inner periphery which is captured between a pair of radially outwardly projecting flanges around the outer periphery of the liner. The flanges permit limited lateral movement of the liner with respect to the outer shell, but prevent the liner from being removed axially from the shell. A plurality of shock absorbing cushion roller assemblies are mounted vertically in slotted cages between the liner and shell. The roller assemblies each include a shaft surrounded by a sleeve within a cushion coating bonded to the sleeve, with thrust washers between the ends of the sleeves and the cages. The roller assemblies are free to turn about their shafts and rotate with the liner, and to move radially of the deck bushing to a limited extent, when impacted by the liner. The roller assemblies absorb and dampen impact loads imparted to the liner by the drill pipe.

REFERENCES:
patent: 2958563 (1960-11-01), Alexandroff
patent: 3097895 (1963-07-01), Matt
patent: 3194611 (1965-07-01), Mahony
patent: 3633980 (1972-01-01), Hunt
patent: 3944300 (1976-03-01), Learmont et al.
patent: 3951470 (1976-04-01), McLean
patent: 4054332 (1977-10-01), Bryan, Jr.
patent: 4076338 (1978-02-01), Hisey
patent: 4186973 (1980-02-01), Work
patent: 4324438 (1982-04-01), Lister
patent: 4326756 (1982-04-01), Moroz

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