E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/16 (2006.01) E21B 10/22 (2006.01) E21B 10/24 (2006.01) E21B 12/02 (2006.01) F16J 15/32 (2006.01)
Patent
CA 2302406
A novel drilling head is provided herein with a cone rock bit, each cone having a stationary part and a part which rotates about an axis of rotation and a dynamic sealing device between the stationary part and the rotary part. The sealing device is borne by the rotary part and has a first sealing lip and a second sealing lip each of which forms a surface of revolution about the axis of rotation and which lips bear respectively against a first bearing face and a second bearing face secured to the stationary part. The first lip is oriented in such a way that it presses against the first bearing face under the action of the pressure, the second lip being oriented in such a way that it moves away from the second bearing face under the action of the pressure of the lubricating product, so as to allow this product to fill a cavity and compensate for the pressure in the cavity.
Besson Alain
Fayaud Patrick
Lecour Pierre
Tissier Bernard
Borden Ladner Gervais Llp
Hutchinson
Total
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