A hand tool with a mechanical linear drive mechanism coupled to a linear activated working implement. The drive mechanism includes a geared planetary roller screw that includes a torque tube connected to a roller screw's nut body. The planetary roller screw includes a fixed outer race, a rotating set of grooved rollers axially aligned inside the outer race, a cylindrical nut body located inside the set of grooved roller, a plurality of inner rollers axially aligned and inside the nut body, a threaded shaft axially aligned and inside the inner rollers, and a torque tube axially aligned inside the inner rollers. The torque tube is connected at one end to a gear box which is coupled to an electric motor. When the electric motor is activated, the torque tube is rotated which causes a threaded shaft in the tool to move axially. A working implement is coupled to the distal end of the threaded shaft.

A planet (11) for a planetary rolling contact gear, along whose planetary axis a middle section (12) having a larger diameter and, axially on both sides of the middle section (12), end sections (13) having a smaller diameter are formed, wherein a first engagement profile (14) is formed on the lateral surface of the planet (11) in the middle section (12) and a second engagement profile (15) is formed on the lateral surface of the planet (11) in the end sections (13), wherein the first engagement profile (14) has a plurality of first teeth (16) that are arranged in an annular manner around the planetary axis, wherein first grooves (17) arranged in an annular manner about the planet axis are formed between successive first teeth (16), wherein the two first edge teeth (23) located at the ends of the middle section (12) are formed within and at a distance from a tooth contour (18) of the first teeth (16) of the middle section (12).

A hand tool with a mechanical linear drive mechanism coupled to a linear activated working implement. The drive mechanism includes a roller screw that includes a torque tube connected to a roller screw's nut body. The roller screw includes a fixed outer race, a rotating set of grooved rollers axially aligned inside the outer race, a cylindrical nut body located inside the set of grooved roller, a plurality of inner rollers axially aligned and inside the nut body, a threaded shaft axially aligned and inside the inner rollers, and a torque tube axially aligned inside the inner rollers. The torque tube is connected at one end to a multiple speed gear box which includes a primary motor coupled to a earner gear with three planet gears. Disposed around the planet gears is a ring gear. Coupled to the ring gear is a secondary motor which when activated causes the ring gear to rotate in the opposite direction of the planet gears. At least one sensor measures the rotation of an elastomeric ring and control activation of the secondary motor to change the operational speed of the tool.

The valve operator assembly is provided for a valve and comprises a housing 18, an input member 20 rotatably mounted, and a transmission mechanism 22 comprising a translating element 24 and a rotating element 28 connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element.

The assembly further comprises at least one locking mechanism 23 radially interposed between the transmission mechanism 22 and the housing 18, and provided with friction means 82 freely movable in circumferential direction relative to the transmission mechanism and to the housing and with one freewheel 80 comprising a plurality of locking members mounted in radial contact with a track of said friction means, the freewheel and the friction means cooperating together to lock the transmission mechanism 22 with the housing 18 in a static position of said assembly.

A hydrostatic actuator and an arrangement for attaching it to a receiving component are provided. The hydrostatic actuator has a master cylinder containing a housing and a piston movable axially within the housing which acts on a pressure chamber filled with a pressurizing agent. The piston is driven by a rotary-driven electric motor having a stator and a rotor, by a rolling planetary transmission that converts the rotary drive to an axial motion. In order to be able to produce such a hydrostatic actuator with little need for construction space, cost-effectively and with better quality, a supporting of the rolling planetary transmission is simplified, and the cooling and shielding of an electronic controller and the pressure behavior of the hydrostatic actuator is improved.

Actuator for actuating a valve device comprising an electric drive (14) being operatively engaged to an actuating element (1) of the valve device, the electric drive (14) comprising at least one torque motor (2) which drives a hollow shaft (3) as an internal rotor, that positions a threaded drive (4) having a screw nut (6) and a threaded spindle (5) for converting the rotational movement of the hollow shaft (3) into a translational movement of the threaded spindle (5), and the threaded spindle (5) acts upon the actuating element (1) for displacing the same, wherein the threaded drive (4) comprises an inverted roller screw (4.1), and the screw nut (6) of the inverted roller screw (4.1) houses the threaded spindle (5) as a push rod.

A valve operator assembly is adapted for use with a valve. The assembly comprises a housing, an input member rotatably mounted with respect to the housing and comprising a rotational drive input, and a transmission mechanism connected to the input member and comprising a stem, the transmission mechanism being adapted to convert applied rotation of the rotational drive input into axial translation of the stem. The assembly further comprises at least one elastic actuator axially located between the input member and the stem to obtain a compression of the actuator during an axial translation of the stem towards the input member and a release of the actuator during an axial translation in the opposite direction.

A reverse input blocking clutch includes an input member, an output member, a pressed member, and an engaging member. When a rotational torque is inputted to the input member, the engaging member moves in a direction away from a pressed surface of the pressed member due to engagement with the input member, and transmits the rotational torque inputted to the input member to the output member due to engagement with the output member; and when rotational torque is reversely inputted to the output member, moves in the direction closer to the pressed surface based on engagement with the output member, and by being pressed against the pressed surface does not transmit the rotational torque reversely inputted to the output member to the input member, or transmits only part thereof to the input member due to engagement with the input member.

A transmission device for controlling the translational movement of an element includes: an exterior planetary gear equipped interiorly with teeth; an interior planetary gear connected to the controlled element and bearing a rack in the direction of translation; a satellite carrier having satellites with helical teeth engaged with the interior teeth; and a stationary housing accommodating the exterior planetary gear, the interior planetary gear, the satellite carrier. The rack is used to control the translational movement of the interior planetary gear. The transmission device is driven by a motor with a transmission acting either on the exterior planetary gear or the satellite carrier.

The reducer includes a screw, threaded internal rollers, and a tapped internal casing. The internal rollers each being in mesh firstly with the screw and secondly with the internal casing by means of at least one thread of opposite hand to a thread of the screw and of the same hand as a thread of the internal casing. The reducer further includes a tapped external casing and external rollers each in mesh firstly with the internal casing and secondly with the external casing. The external rollers are provided with at least one thread of opposite hand to a thread of the internal casing and of the same hand as a thread of the external casing.