Seal assembly for a rotary earth bit

Details Seal assembly for a rotary earth bit Seal assembly for a rotary earth bit

E - Fixed Constructions

21

B

E21B 10/25 (2006.01)

Patent

CA 2754981

An earth bit includes a cutting cone carried by a lug, and an interstice seal assembly which forms a dy-namic seal with a radial interstice lug surface of the lug. The interstice seal assembly includes a rigid sealing ring having lengthened and shortened arm portions. The length-ened arm portion extends outwardly from the shortened arm portion, and engages the radial interstice lug surface.

L'invention porte sur un trépan de forage, qui comprend un cône de coupe porté par un ergot, et un ensemble d'étanchéité d'interstice qui forme un joint d'étanchéité dynamique avec une surface d'ergot à interstice radial de l'ergot. L'ensemble d'étanchéité d'interstice comprend une bague d'étanchéité rigide comprenant des parties de bras allongées et raccourcies. La partie de bras allongée s'étend vers l'extérieur à partir de la partie de bras raccourcie, et vient en prise avec la surface d'ergot à interstice radial.

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