Rock bit lubrication system utilizing expellable plug for obtain

Details Rock bit lubrication system utilizing expellable plug for obtain Rock bit lubrication system utilizing expellable plug for obtain

1979-05-07

1981-06-23

Pate, III, William F.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175374, E21B 1024

Patent

active

042744989

ABSTRACT:
A rotary rock bit is constructed with a lubrication system having an expansion space provided within the lubrication system to accommodate increases in internal volume during drilling. A flexible diaphragm is located in the lubricant reservoir cavity in the bit dividing the cavity into a lubricant portion and an expansion portion. A low melting point wax plug is positioned in the expansion portion of the lubricant reservoir. The lubricant portion of the lubricant reservoir is filled with lubricant. The wax plug prevents lubricant from entering the expansion portion. The bit is heated above the melting temperature of the wax plug allowing the wax to melt and run out of the bit. This provides an expansion space in the bit to accommodate an increase in volume in the lubrication system during drilling.

REFERENCES:
patent: 3022826 (1962-02-01), Kisling
patent: 3230020 (1966-01-01), Gilbert et al.
patent: 3476195 (1969-11-01), Galle
patent: 3487890 (1970-01-01), Martinsen
patent: 3719241 (1973-03-01), Bell
patent: 3847234 (1974-11-01), Schumacker
patent: 3917028 (1975-11-01), Garner
patent: 4014595 (1977-03-01), Dolzal

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