Abstract: A vibrator includes a tubular element including one or more sections, the upper end of which is provided with an element for suspension from a hoisting and/or guiding machine and the lower end of which is connected to an endpiece successively including a damper-isolator, a generator of vibrations (4) and a tip (5). This vibrator is made in several detachable elements assembled end-to-end by an element of a plurality of fixing screws (30), the heads or nuts of which are accessible by an element of at least one cavity (27) provided in at least one of the elements and at least one removable locking part (C1, C2) which engages into the cavity (27) by bearing upon the heads or the nuts, so as to ensure the captivity of the screws (30) and to avoid that the assembly be able to dissociate during use.

Abstract: A vibrator includes a tubular element including one or more sections, the upper end of which is provided with an element for suspension from a hoisting and/or guiding machine and the lower end of which is connected to an endpiece successively including a damper-isolator, a generator of vibrations (4) and a tip (5). This vibrator is made in several detachable elements assembled end-to-end by an element of a plurality of fixing screws (30), the heads or nuts of which are accessible by an element of at least one cavity (27) provided in at least one of the elements and at least one removable locking part (C1, C2) which engages into the cavity (27) by bearing upon the heads or the nuts, so as to ensure the captivity of the screws (30) and to avoid that the assembly be able to dissociate during use.

Abstract: The servo-control system for hydraulic unit according to the invention comprises a pump driven by a motor feeding hydraulic fluid to a vibrator or vibrating system comprising eccentric weights driven in rotation by at least one hydraulic motor receiving said fluid. It also comprises adaptation means for continuous adaptation of the rotation speed of the motor of the hydraulic unit in relation to the energy actually consumed by the vibrator.

Abstract: For a first gear ratio, the flyweights engage the clutch and thus connect the input to the sun wheel, whilst the ring gear is immobilised by the free wheel. For the second gear ratio, the flyweights push the ring gear against the axial thrust of the helical teeth in a direction causing the engagement of the clutch against the ring and thus, at the same time, the disengagement of the clutch. The thrust produced by the teeth on the ring gear decreases and transmission then occurs from the input to the ring gear, whilst the sun wheel is immobilised by its free wheel. The speed increases further, the flyweights rise further, compress the prestressed springs and push the ring in the direction of the engagement of the clutch, which produces direct drive.

Abstract: For a first gear ratio, the flyweights engage the clutch and thus connect the input to the sun wheel, whilst the ring gear is immobilised by the free wheel. For the second gear ratio, the flyweights push the ring gear against the axial thrust of the helical teeth in a direction causing the engagement of the clutch against the ring and thus, at the same time, the disengagement of the clutch. The thrust produced by the teeth on the ring gear decreases and transmission then occurs from the input to the ring gear, whilst the sun wheel is immobilised by its free wheel. The speed increases further, the flyweights rise further, compress the prestressed springs and push the ring in the direction of the engagement of the clutch, which produces direct drive.

Abstract: A roll control actuator (34) for installation between first and second axially aligned parts (14,16) of a torsion bar (12) has a cylindrical housing (36) connectable by an end wall (38) to the second part of the torsion bar. A rod (40) is positioned inside the housing, extends out of the other end (42) of the housing, and is connectable to the second part of the torsion bar. A cylindrical inner sleeve (46) is positioned inside the housing between the housing and the rod; and the housing, the rod, and the inner sleeve are coaxial on an axis (A), with the rod being rotatable about the axis relative to the housing.

Abstract: A roll control actuator (34) for installation between first and second axially aligned parts (14,16) of a torsion bar comprises a first cylindrical housing (36) connectable at one end (38) to the first part of the torsion bar and having a cylindrical wall (44) with an inner surface (68) and a second cylindrical housing (40) connectable at one end (42) to the second part of the torsion bar and having a cylindrical wall (46) with an inner surface (50,72). The cylindrical wall of the first housing is coaxial with, rotatable relative to, and axially fixed relative to, the cylindrical wall of the second housing. A shaft (62) positioned inside the first and second housings is capable of moving in the axial direction relative to the first and second housings. A first tripot joint (76) is mounted on the shaft and has rollers (80) positioned in helically extending grooves (70) formed in the inner surface of the cylindrical wall of the first housing.