Indicating means for a rock bit lubricating system

Details Indicating means for a rock bit lubricating system Indicating means for a rock bit lubricating system

E - Fixed Constructions

21

B

E21B 10/24 (2006.01) E21B 10/18 (2006.01) F16N 21/00 (2006.01) F16N 23/00 (2006.01) F16N 29/00 (2006.01) F16N 9/02 (2006.01)

Patent

CA 2055399

66235-84 ABSTRACT In order to detect when a lubricant is nearly depleted in a lubricant reservoir provided in a sealed rotary cutter rock drill bit, compressed air used for removal of cuttings is passed through a valve in the reservoir. As the lubricant is used up a compressed spring gradually extends. In one embodiment, eventually a vent hole in the valve is opened causing a large pressure drop signifying an empty condition of the reservoir. In another embodiment, the valve is closed when the lubricant is depleted, giving rise to a sudden rise in pressure also signifying an empty condition.

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