Methods and apparatus for lubricating a rotary cutter

Details Methods and apparatus for lubricating a rotary cutter Methods and apparatus for lubricating a rotary cutter

1997-08-12

1998-11-24

Tsay, Frank

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175371, E21B 1022

Patent

active

058395237

ABSTRACT:
A rotary cutter includes a shaft adapted to be mounted on a support and defining a longitudinal axis. The shaft includes a bore extending inwardly into the shaft, and a channel extending into the shaft and intersecting the bore. A roller body, having cutting elements, is mounted on the shaft for rotation relative thereto about the axis. Bearings are disposed between the roller body and the shaft, the bearings communicating with the bore. The cutter is lubricated by inserting a filling plug into the bore and forcing lubricant therethrough and into the bearings. The filling plug is then removed from the bore, leaving the bore generally free of lubricant. A hollow cylindrical member and a flexible diaphragm are inserted into the bore, and a nozzle is inserted through the channel for introducing lubricant into the bore. The nozzle is then removed from the channel, and the channel is plugged. The diaphragm flexes inwardly and outwardly in response to variations in external and internal pressures.

REFERENCES:
patent: 1909128 (1933-05-01), Scott et al.
patent: 3244459 (1966-04-01), Ortloff
patent: 4183416 (1980-01-01), Walters
patent: 4887675 (1989-12-01), Shotwell
patent: 5363930 (1994-11-01), Hern
patent: 5485890 (1996-01-01), Cawthorne et al.
patent: 5558172 (1996-09-01), Millsopps, Jr.

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