A sliding table assembly includes a sliding seat unit slidably mounted to a base unit. Two auxiliary sliding seats are slidably mounted to the base unit and disposed on two sides of the sliding seat unit. A connection member is connected between the auxiliary sliding seats. Two roller sets are respectively mounted to the auxiliary sliding seats. Each roller set has rollers to roll on the base unit. A driving screw rod is coupled to the sliding seat unit and embraced by the auxiliary seats. When the sliding unit is moved by the driving screw rod, it pushes the auxiliary sliding seats to slide together therewith.

An electromechanical cylinder contains a casing, an actuating rod mounted so as to be able to move longitudinally relative to the casing, an electric motor provided with a rotating rotor shaft, a mechanism for transforming a rotational movement of the rotor shaft of the electric motor into a linear translational movement of the actuating rod, and at least one bearing for guiding the rotor shaft of the electric motor in rotation relative to the casing and for supporting the rotor shaft. The cylinder further contains a sleeve that is fastened to the casing and inside which is mounted the bearing, and at least one load sensor that is mounted on the sleeve while being offset axially relative to the bearing.

A linear actuator includes a screw shaft comprising a screw thread and having a longitudinal axis A, a nut movable along the screw shaft from a retracted position to an extended position, and a plurality of rollers movable with the nut. Each roller includes a cylindrical surface configured to roll along one or more flanks of the screw thread, such that rotation of the screw shaft causes the rollers to roll along the flank(s) so that the nut translates in an axial direction along the screw shaft. The screw thread has a variable lead angle. The actuator can be part of a power door opening system of an aircraft.

Embodiments of an electric linear actuator may include a roller screw assembly, an electric motor coupled to the roller screw assembly, and a linear transducer operatively coupled with the roller screw assembly. The motor may be configured to drive the roller screw assembly to extend and retract another component, such as a rod. In some embodiments, the linear transducer may be configured to detect a position of the rod. The roller screw assembly may be coupled directly to the motor via a gear coupling, with the motor disposed generally in axial alignment with the roller screw assembly. Other embodiments disclosed herein include a veneer lathe carriage with electric linear actuators and corresponding apparatuses, methods, and systems.

A thrust reverser drive arrangement is described for use in driving a thrust reverser cowl for movement relative to first and second guide tracks, the drive arrangement comprising a first actuator located, in use, close to the first guide track, and a second actuator located, in use, close to the second guide track, the actuators being arranged to be driven in synchronism and at the same speed by a drive motor to drive the cowl for movement, wherein at least one of the first and second actuators is provided with a load limiter to limit the transmission of loads through that actuator in the event that that actuator is subject to a compressive loading greater than a predetermined level.

An actuator is for use in petroleum exploitation and is configured for displacing a rod for engaging a well barrier device. The actuator has a housing for at least a portion of the rod; at least two roller screws rotatably arranged in the housing; rotational means connected to the roller screws via one gear systems for each roller screw for simultaneous rotation of the roller screws; and a roller nut engaging each roller screw. The roller screws and roller nuts are configured such that rotation of the roller screws result in displacement of the roller nuts relative to the roller screws. Each roller nut is coupled with one actuation element via spherical bearings, and each actuation element is configured for mechanical coupling to an end portion of the rod for displacing the rod in operational use.

An electromechanical actuator includes a first electric motor, a first motion conversion mechanism, a second motion conversion mechanism, and a rotation restriction mechanism for the second motion conversion mechanism. The first motion conversion mechanism includes a first member that is rotated by an output of the first electric motor and a second member that is fastened to the first member. The second motion conversion mechanism includes a third member that is movable integrally with the first member and a fourth member that is fastened to the third member. The rotation restriction mechanism is configured to be capable of selectively restricting and allowing rotation of the fourth member in accordance with movement of the third member.

An anti-rotation system having a replaceable keyway is disclosed, wherein the system comprises a housing having a bore extending along an axis of the housing, and a housing aperture extending from an outside surface of the housing to the bore and extending along the housing parallel to the axis of the housing; a member configured to slide within the bore along the axis of the housing; an insert defining a keyway removably mounted on the housing wherein the keyway extends at least partially into the housing aperture; and a key carried by the member and engaged with the keyway defined by the insert; wherein the key cooperates with the insert to resist rotation of the member about the axis of the housing.

A wave machine (8) that produces different shapes of standing, parabolic-shaped waveforms (150) used by surfers (200). The parabolic waveforms (150) have different face angles and depths. The machine (8) includes a rotating container (10) partially filled with a fluid 140. When the container (10) is rotated, a standing, parabolic waveform 150 is created in the fluid (140). In one embodiment, the container (10) is bowl container (11) with curved panels (60) and terminate at an upper edge (16). On or near the upper edge (16) of the sidewall (14) is upper flange (18) that partially extends into the bowl container (11). The bowl container (11) is coupled to a speed adjustable drive mechanism (50). As the bowl container (11) is rotated, fluid (14) is forced outward against the sidewall (14) and forms a parabolic waveform (150). As the speed of rotation is increased, the fluid (140) flows upward over the sidewall (14) and against the upper flange (18). The thickness, depth and face of parabolic waveform (150) adjacent to the sidewall (14) are increased.

A linear actuator includes a screw shaft comprising a screw thread and having a longitudinal axis A, a nut movable along the screw shaft from a retracted position to an extended position, and a plurality of rollers movable with the nut. Each roller includes a cylindrical surface configured to roll along one or more flanks of the screw thread, such that rotation of the screw shaft causes the rollers to roll along the flank(s) so that the nut translates in an axial direction along the screw shaft. The screw thread has a variable lead angle. The actuator can be part of a power door opening system of an aircraft.