Abstract: A drilling head with a cone rock bit, each cone having a stationary part and a rotary part which rotates about an axis of rotation. Also included is a dynamic sealing device between the stationary part and the rotary part. The sealing device is borne by the rotary party and has a first sealing lip and a second sealing lip, each of which forms a surface of revolution about the axis of rotation. Further, the first and second 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, and the second lip is 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.

Abstract: A drilling tool including a drilling head equipped with cutting edges and fitted with several shock-absorption elements, of which at least one part is made of an elastomer material. Each shock-absorption element having a block incorporating one portion inserted inside a receptor housing formed on the tool surface, and a portion which projects outward beyond the receptor housing.

Abstract: A suspension device for a mobile self-lift drilling platform, comprising a water-tight chamber deformable under the effect of the load supported by the legs of the platform, this chamber being intended to be filled with a pressurized liquid. The deformability of the chamber is provided by its side wall which is formed by a tubular elastomeric element, with a substantially vertical axis, which element is secured to an inner and an outer tubular coaxial metal guide frames for translationally and rotationally guiding its axial, lateral and angular deformations under the effect of the load as well as of possible accidental shocks.