Abstract: An actuator, which can be actuated along a longitudinal axis, in particular for a spring carrier, includes a stationary part, a first rotor, which can be driven so as to perform a rotary motion, a rotatable second rotor, which is supported against the stationary part in the axial direction in an axial rest position, a coupling device, by which the second rotor is coupled to the first rotor, and an output element, which is connected to the second rotor and can be moved axially by means of a rotary motion of the second rotor. The coupling device interacts with the first rotor and the second rotor in such a way that, starting from the rest position, an axial movement of the second rotor can be produced by means of a first rotary motion of the first rotor in order to release the second rotor from the stationary part and thereby bring it into a working position.

Abstract: A vibration actuator comprising: a vibration portion which contacts a relative movement portion, and produces necessary vibration for a relative movement of the relative movement portion; a first member provided to hold the relative movement portion between the first member and the vibration portion, and moves relative to the vibration portion in response to movement of the relative movement portion with respect to the vibration portion; a second member which faces the first member via a rolling member, and supports the first member so that the first member is movable relative to the vibration portion; and a pressing member which generate a pressing force between the second member and the vibration portion so that the vibration portion and the relative movement portion are in contact with each othercome in contact with each other; and wherein the first member comprises a plastic substance.

Abstract: An electromechanical solution for 2 axis solar tracking is disclosed that is suitable for application with a single solar heat, hot water or photovoltaic panel. 3 points of contact are arranged in a triangle on the back of the panel with 2 points of contact connected by linear actuators and flexible couplings. The third point of contact is a spherical bearing at the base of the panel. The actuators are independently adjustable in length by using electric motors according to a microprocessor program. In this way, 2 rotary axes of motion with limited angles are achieved which can orient the panel to the sun with minimal hardware. Since only one solar panel is being controlled the mechanical force required is minimized.

Abstract: A rotary actuator includes a shaft with a knob which are rotatable about a shaft axis. The actuator includes a haptic effect device connected to the knob via the shaft. The haptic device is rotatable about the axis and includes a detent ring and a bolt fixed to the shaft. The haptic device and gearing engage one another such that haptic device is fixed in place unless the gearing is driven and the haptic device rotates when the gearing is driven. The bolt engages the detent ring to act as a mechanical catch for producing a haptic effect when the haptic device is fixed in place and the knob is manually rotated. The bolt engages the detent ring such that the haptic device together with the knob rotate when the gearing is being driven by a motor whereby the knob is rotated without manual intervention.

Abstract: Vibrational apparatus capable of providing a vibrational output, said apparatus comprising or including an assembly having a shuttle capable of shuttling between complementary structures, at least one of which complementary structures provides the vibrational output, the arrangement being characterised in that there is a drive to rotate the shuttle and there are magnetic interactions between the rotating shuttle and the complementary structures such that interactions with each complementary structure, and the phasing of the complementary structures relative to the shuttle, alternating magnetic results in the shuttling movement of the shuttle.

Abstract: An impact tool for simultaneously providing a rotational force and an impact force to an object has an output shaft rotated by a motor, hammer for intermittently providing an impact force to the output shaft, hammer holder for movably holding the hammer, and an impact force generator for generating the impact force from an output of the motor. An air chamber is formed between the hammer and the hammer holder such that a volume of the air chamber is variable in response to a position of the hammer relative to the hammer holder. In addition, the hammer receives a bias force generated in a direction toward the output shaft by a biasing device. This bias force effectively increases the impact force in cooperation with an air pressure caused by a volume change of the air chamber.

Abstract: A method for stepping a first member relative to a second member. The method including: providing one of the first and second members with one of a plurality of pockets and movable pins offset from each other with a first spacing; providing the other of the first and second members with the other of the plurality of pockets and movable pins offset from each other with a second spacing, where the first spacing is different from the first spacing; and engaging at least one of the movable pins into a corresponding pocket to step one of the first and second members a predetermined linear and/or rotary displacement.

Abstract: A controllable variable length link device is disclosed. The device includes a first half-link having a first end connected to a driving system and a second end, a second half-link having a first end connected to a driven system and a second end, a rotary displacement member including a rotator shaft and a rotary head cooperating with the second ends of the half-links to bring about opposite movement of the half-links, a bearing unit in which the rotator shaft is mounted, respective guiding units which guide the two half-links in translation in at least two parallel directions, the guiding units being mechanically connected to the bearing means; and a driving unit which drives the shaft in rotation in both directions in accordance with a predetermined relationship.

Abstract: An electronic device capable of ejecting a peripheral element is disclosed, including a housing, a first wheel and a driving unit. The housing has a chamber, wherein the peripheral element is stored in the chamber. The first wheel is disposed in the housing, wherein the first wheel contacts the peripheral element. The driving unit is disposed in the housing, the driving unit rotates the first wheel, and the first wheel moves the peripheral element from a first position to a second position.

Abstract: A movable body driving device includes upper and lower racks movable in a lengthwise direction; a motor which can rotate forward and backward; a drive pinion fixed to a rotary shaft of the motor; and a driven pinion engaging the upper and lower racks to move linearly by the drive pinion. The driven pinion is driven to rotate by the upper or lower rack to thereby drive the lower or upper rack linearly in a direction reverse to the other rack. A sliding door is connected to the upper or lower rack and is opened or closed in accordance with forward or backward rotation of the motor. The drive pinion transmits its driving force while the rack to which the driving force is transmitted is changed from the upper rack to the lower rack or from the lower rack to the upper rack.

Abstract: A linear actuator has a modulized structure that allows at least a transmission unit, an actuation unit, and a power device of the linear actuator to be combined integrally. The actuator is advantaged by its reduced manufacturing and fabricating costs, simplified and compact structure, as well as expanded application scope.

Abstract: Vibrational apparatus capable of providing a vibrational output. The apparatus includes an assembly having a shuttle capable of shuttling between complementary structures, at least one of which complementary structures provides the vibrational output. The arrangement includes a drive to rotate the shuttle and there are magnetic interactions between the rotating shuttle and the complementary structures such that interactions with each complementary structure, and the phasing of the complementary structures relative to the shuttle, and alternating magnetic results forces in the shuttling movement of the shuttle.

Abstract: A Stirling engine is provided with a fluid passage that connects a low temperature-side actuating fluid space and a crankcase inner space, and a passage opening/closing valve that is provided in the fluid passage and that opens and closes the fluid passage. Upon stopping of the Stirling engine, the passage opening/closing valve enables communication through the fluid passage, at a region at which the piston floats in the cylinder. This region is determined based on the pressure of an actuating fluid in the actuating fluid space and the rotational speed of a crankshaft of the Stirling engine.

Abstract: The invention provides an actuator apparatus which may be used to adjust flow of fluid or air in conjunction with a rack and pinion system. The device is able to rotate both vertically and horizontally via a mechanism that transforms axial movement into rotary movement. The device is useful in a range of circumstances where required specific and controllable rotary motion is required.

Abstract: Apparatus (10, 12, 14, 16, 18, 20) for conversion of a rotary drive force such as from a drive motor (22) into a vectored linear force m a known, controlled and predictable manner. The vectored linear force may be used for lifting/moving objects, pushing objects through water or into space. The vectored linear force is generated without the expulsion of mass or reaction with an external material or medium. As a consequence, the force generating apparatus may be embodied within an enclosed system having an energy source for generating the rotary drive force that can sourced from ordinary means such as an electrical generator, or from hydraulic or other mechanical sources.

Abstract: A rotary machine is provided having rotating forward and rearward work members having cyclic non-constant angle motion there between, the machine includes a rotating shaft and a first gear eccentrically mounted with the rotating shaft. A reaction gear in mesh with the first gear causes the first gear to rotate with respect to the rotating shaft. First and second connecting rods are pivotally connected with the first gear. First and second crank arms are pivotally connected with the respective first and second connecting rods. First and second coaxial shafts are connected with the respective first and second first crank arms. The first shaft is connected with at least one forward work member. The second shaft is connected with at least one rearward work member.

Abstract: A 3-dimensional (3D) variable-axis machine is disclosed, which includes a frame spaced from a base to be disposed at an upper surface of a workpiece, a pair of forward and backward pivoting frames having an arch shape connected to the frame, a pair of leftward and rightward pivoting frames having an arch shape and a relatively less height than the forward and backward pivoting frames to be connected across the forward and backward pivoting frames, and a spindle vertically inserted in an intersectional portion between the forward and backward and the leftward and rightward pivoting frames to be pivoted corresponding to movements of the both pivoting frames. The spindle is connected to a sliding member, and the sliding member is connected to a lower surface of the forward and backward pivoting frames and an upper surface of the leftward and rightward pivoting frames in a sliding manner.

Abstract: Embodiments are disclosed of a drive apparatus for a reciprocating tool, that comprises a housing, a rotatable drive shaft assembly located in the housing, an elongated plunger located in the housing for reciprocating motion, the plunger having a front end portion for attaching a cutting blade thereto, a rotary joint elongated rocker having a lower end portion with a lower pivot connection to the housing and an upper end with an upper pivot connection to a mid portion of the plunger, a wobble plate interface operatively connected to the drive shaft assembly, a lower portion having an effective lower pivot connection, the interface also having an upper pivot connection to a rear portion of the plunger and configured to reciprocate the plunger generally in its lengthwise direction during alternating cutting and return strokes, the distances between the upper and lower pivot connections of both the rocker and wobble plate interface together with the distance between the upper pivot connections thereof to the plu

Abstract: A cutter bar drive system for a draper header has a cutter bar disposed at a leading edge of the header to cut crop. A cutter bar gear box in operative engagement with the cutter bar is mounted on a forward portion of the header with a drive train mounted on the header to drive the gear box and cutter bar. An external flywheel is mounted along the drive train remote from the gear box and is engaged with the drive train to reduce vibration in the cutter bar and gear box from a remote, external position.

Abstract: A tool carrier assembly (100) comprising a main body (101), a quick hitch (102), and a rotatable locking device (103) between the quick hitch and the main body. The rotatable locking device employs releasable locking means (104,105) at opposite ends. A scroll plate (106), cylinder (107) and piston (108) which upon assembly is located inside the cylinder) are located between the releasable locking means (104,105). In normal operation the piston (108) is driven back and forth to tilt the hitch by reason of rotation of the cylinder as guide (109) travels in the helical guide way (110) of the scroll plate (106). The hitch is fixed to the cylinder and the main body is fixed to the scroll plate. The releaseable locking means (104) and (105) each comprise an internally tapered end cup (111), bearing (112), an unlock piston (113), a locking element (114) and a locking spring (115).

Abstract: A rotary micro-adjustment mechanism for a synchronous double-drive positioning platform (such as a gantry) is disposed between a beam and support pillars of the synchronous double-drive positioning platform and comprises a positioning pillar and elastic members. The positioning pillar is provided to pivot the beam relative to the respective support pillars to compensate displacement error of the beam and the support pillars. The elastic members are provided to resist the pivotal rotation between the beam and the support pillar by their restoring force, so as to improve the rigidity of the overall mechanism.

Abstract: A mechanism for use in an elevator governor assembly including a ground configured to rotate about a ground axis, three or more circumferentially overlapping cams each pivotally attached to the ground at one of three or more ground pivot points radially spaced from the ground axis, and a plurality of links pivotally attaching the three or more cams to one another at a plurality of link pivot points. The circumferentially overlapping cams form a substantially contiguous circular ring about the ground axis. The interconnection of the ground, the cams, and the links form a generally circular mechanism.

Abstract: An actuator includes a first rotary motor, a second rotary motor, and a transmission coupled to the first and second rotary motors. The transmission converts rotation of the first rotary motor in a first direction and simultaneous rotation of the second rotary motor in a second direction to linear motion of an output shaft in a single direction. The actuator is usable in an active automobile suspension.

Abstract: A rotational movement generating apparatus having a platform supported by a support assembly. The support assembly connects to a central point of the platform in a manner that allows the platform to rotate at the central point. A central axis is defined with the circular rotation of the platform. The platform defines a first radius line extending from the central point to an outer edge of the platform. An arm connects to the platform at a connection point that is spaced apart from the first radius line of the platform. A first portion of the arm ends at an elbow where it connects to a second portion of the arm. The second portion of the arm is positioned to extend in an upward direction over the first radius line at a predetermined angle towards the central axis. A thrust bearing is positioned above the platform in alignment with the central point. The thrust bearing has an outer disk rotatably encircling a thrust cylinder. The second portion of the arm connects to the outer disk.

Abstract: A centrifugal advance mechanism has drive and driven members connected with one another to rotate about a common axis as they move toward and away from each other along the common axis. A resilient element biases the members toward each other. A ramp on one of the members has an inner end portion and an outer end portion. The inner end portion is closer to the common axis than the outer end portion, the ramp rising as it moves from the inner end portion toward the outer end portion. A bail contacts the ramp and the other member. The resilient element biases the ball down the ramp, the ball traveling radially outward and up the ramp as the members rotate at increasing angular velocity thereby causing the members to separate from each other against the bias of the resilient element and to rotate with respect to each other.

Abstract: A hydraulic pressing and/or cutting tool (1) comprises an electric motor (6), a converting mechanism (8) suitable to convert the rotary motion of the motor (9) to an oscillating translational motion, a hydraulic pump (11) suitable to carry out, in response to the oscillating translational motion, an increase in the pressure of a pressure fluid acting on an operating piston (12) such that the operating piston (12) is displaced, a stationary jaw (13) and a movable jaw (14) connected to the operating piston (12) such that, in response to the displacement of the operating piston (12), the movable jaw is displaced to the stationary jaw (13) to carry out pressing or cutting operations. The converting mechanism (8) comprises an epicycloidal gear (16) and a thrust unit (17) co-axial with the epicycloidal gear (16).

Abstract: A servo drive system of a press machine includes a ram, an operation shaft which vertically moves the ram, and a servo motor which operates as a power source of the ram and which generates ram pressure using a torque based on at least one speed-torque characteristic of the servo motor. The operation shaft is directly driven using the servo motor. The at least one speed-torque characteristic of the servo motor is set in a manner such that a motor torque of the servo motor at which a capacity of electric energy supplied by a servo amplifier is determined becomes the motor torque at which an optimal punching pattern of the ram is generated from a light load to a heavy load according to a type of workpiece to be worked by the press machine.

Abstract: Underspringing arrangements for mattresses are known, in particular for mattresses of furniture for sleeping on, which have resilient slats that act as support elements for the mattress and that at opposite ends are mounted with elastic bearing means on a frame. The bearing means and the resilient slats yield elastically when the mattresses are subjected to a load. Otherwise, however, the bearing means and the resilient slats are passive. The invention relates to stimulation actuators that exert any desired movements on the underspringing arrangement. The underspringing arrangement has lifting members (11) that are mounted elastically by means of elastic elements (14). The elastic elements (14) are arranged such that at least a main direction of work extends at an angle with respect to the direction of the movement of the lifting member. In this way, the lifting member (11) can have a particularly low overall height.

Abstract: The present invention provides an attachment facility for converting a rotary tool to oscillatory tool. The attachment facility may attach to a rotating drive shaft of the rotary tool and may convert the rotating motion of the drive shaft to an oscillating motion. This oscillating motion may provide oscillatory or vibration movements to the blades attached to rotary tool.

Abstract: A continuous working system of a press machine includes a ram, an operation shaft which vertically moves the ram, and a servo motor which operates as a power source of the ram and which generates ram pressure using a torque based on at least one speed-torque characteristic of a motor. The operation shaft is directly driven using the servo motor. The operation shaft is continuously reciprocated and turned through an angle range corresponding to a distance between a predetermined lower end position required for press working by the ram and an upper end position such that the ram vertically moves between these positions by the servo motor, thereby subjecting a work to a continuous press working. The upper end position is set to a position slightly below a medium height of the entire vertically possible stroke of the ram. The lower end position is set to a position slightly above a bottom dead center of the entire vertically possible stroke of the ram.

Abstract: An edge morphing arrangement for an airfoil having upper and lower control surfaces is provided with a rib element arranged to overlie the edge of the airfoil. The rib element has first and second rib portions arranged to communicate with respectively associated ones of the upper and lower control surfaces of the airfoil. A first compliant linkage element has first and second ends and is disposed between the first and second rib portions of the rib element, the first and second ends are each coupled to the interior of a respectively associated one of the first and second rib portions. There is additionally provided a driving link having first and second driving link ends, the first driving link end being coupled to the interior of a selectable one of the first and second rib portions.

Abstract: A heart pump has a pump chamber and a pump element that strokes between a retracted and an extended position. A motor rotates a drive shaft in a single direction. A reversing mechanism coupled between the drive shaft of the motor and the pump element converts rotary motion of the drive shaft to reciprocal stroking movement of the pump element. A mechanical stroke length controller connected to the reversing mechanism varies the stroke length in response to changes in fluid pressure in the pump chamber.

Abstract: The invention relates to a wiper drive (10), in particular for a window wiping device for a motor vehicle, having a motor and a gear mechanism. Until now, the motor and the gear mechanism have been accommodated in two separate adjoining housings. The gear mechanism housing is manufactured from cast metal. In order to reduce costs, in the wiper drive according to the invention the motor and the gearbox are arranged in a common housing (11).

Abstract: A second sleeve (2) moved to and fro inside a cartridge (1) can be used to change a length of a retractable pen for writing. Because a first sleeve (5) fixed below the cartridge (1), a hood (6) fixed below and exposed outside the first sleeve (5), an inner sleeve (4) longer than the hood (6) further received inside the hood (6), and, at least, a positioning cleat (7) radially threaded through a longitudinal groove (22) of the second sleeve (2); when a second end (23) of the second sleeve (2) is pressed by or released from a pressure exerted by manual operation, which cause three-ring set of springs on circular grooves to stretch or retract a nib (31) for a writing or not, due to the cleat is operated in contact with a first or second dead center of the longitudinal groove respectively.

Abstract: Embodiments described herein include a method for converting free-piston linear motion to rotary motion, comprising: providing a free-piston generator or motor/generator that has at least one piston having two compression heads; and, for each piston, a surface is provided on each compression head defining a helical channel, wherein the piston is rotated in a single direction due to the force imparted to the piston as compressed air in an air box is forced through the helical channel.

Abstract: The present invention discloses a rotating axle with anti-shaking function that comprises: a fixed part with a sleeve which is axially formed to have an axle hole; an inner collar disposed with at least a hollow clamping ring; an end seal plate axially formed to have a through hole whose circumference is disposed with a plurality of slightly protruded portions fittingly connected and fastened onto one end of the axle hole; a movable part extending axially to form an axle which is inserted through the through hole and encircled with the clamping ring.

Abstract: A guiding structure includes a base and a guiding unit. The base has an opening, and an inner wall of the base, facing the opening, is formed with at least one first guiding element and at least one first restricting element disposed adjacent to the first guiding element. The guiding unit is inserted into the opening and has at least one second guiding element and at least one second restricting element. The second guiding element is correspondingly coupled to or separated from the first restricting element by deforming, bending, rotating or displacing. The first guiding element is disposed corresponding to the second guiding element.

Abstract: A vibrating assembly for a vibration exerciser has a base, a drive device, a transmission, multiple stanchions and a platform. The drive device is mounted on the base and has a drive wheel. The transmission has a drive axle, two rotary cranks, two reciprocating cranks, two base levers and two platform levers. The drive axle is mounted rotatably on the base and connected to the drive wheel and has two ends. The rotary cranks are respectively mounted on the ends of the drive axle. The reciprocating cranks are pivotally connected to the rotary cranks. The levers have moving ends mounted on corresponding reciprocating cranks and stationary ends. The stationary ends of the base levers are attached to the base. The stationary ends of the platform levers are attached to the platform. The stanchions are attached to the base and have guide rods telescopically protruding therefrom and attached to the platform.

Abstract: A device for actuating the doors of vehicles, in particular of an aircraft. The device comprises a drive element, which co-operates with a door lock. A lifting motion of a shaft element and a subsequent rotational motion of a follower element are carried out in an actuation device by a drive element.

Abstract: A micro actuator including a translationally driving section having a moving portion which is incorporated in a case and moves translationally, and a displacement enlarging member having one end portion connected to the moving portion of the translationally driving section and another end portion connected to the case, wherein as the one end portion is pulled on the basis of the translational movement, the amount of displacement of its distal end is enlarged.

Abstract: The device for controlling fluid flow from a rain retention chamber or the like includes an inlet communicating with the chamber, an outlet permitting fluid to flow out of the device, and a shutter disposed between the inlet and the outlet, and supported in the device for linear shifting between a raised position and lowered position. A control element is rotatably mounted in a device for rotation about a central axis and includes a curved controller surface which is non-concentric with the central axis of the central element, such that rotation of the control element varies the radial distance between the central axis and the controller surface. A coupler member operably connects the shutter with the controller surface, such that rotation of the control element shifts the shutter between the raised and lowered positions to achieve a predetermined flow rate of fluid from the chamber.

Abstract: A mechanism transforms a longitudinal reciprocation movement of a piston in a cylinder into a combined unidirectional rotation and reciprocating movement of the piston. In order to achieve this transformation the piston includes a closed wave shaped groove on its circumference. The closed wave shaped groove has recesses at its apexes. The recesses break the symmetry of the groove. Balls that are located in the cylinder protrude into the groove. When the piston is reciprocating, the groove slides on the balls. A flexible heat shrink ring secures the balls in place and assures that the balls are constantly biased toward the face of the groove.

Abstract: A drive mechanism for transmitting rotation force in surgical devices comprises a nutating gear reduction drive having an input and an output. The input is configured to be driven at high speed, low torque by a proximal drive shaft of a surgical device. The output is configured to transmit a low speed, high torque rotational force. The proximal drive shaft can be flexible. In one embodiment, the nutating gear reduction drive includes a wobble plate. This nutating gear reduction drive may include at least one crown gear. In an alternative embodiment, the nutating gear drive includes at least one ring gear. The ring gear is fixed in place. This embodiment can also include at least one spur gear.

Abstract: The present invention relates to a rotary motor, preferably a pivot drive for construction machinery, hoisting gear, trucks and the like, comprising an elongate, approximately tubular housing, at least one piston which is axially displaceably received in the housing and which can be axially driven by the charging of a pressure medium in a pressure chamber as well as at least one shaft which is received axially fixedly in the housing and rotatably around an axis of rotation, with the piston having a shaft passage cut-out by which the piston is axially displaceably seated on the shaft. In accordance with the invention, the shaft forms a crankshaft whose axis of rotation is offset with respect to the shaft passage cut-out.

Abstract: The present invention provides a new bearing device of free rolling parts. According to the basic embodiment the bearing device is comprised of: an inner race, an outer race, two rows of rolling parts wherein each rolling part is in not in a contact with two adjacent rolling parts in the same row and in contact with rolling parts of at least one adjacent row and/or with the surface of one of the races. The bearing structure is designed to create orbital eccentricity between the inner race and the outer race. When a load is applied on said bearing it is equally distributed over all rolling parts. Furthermore, the load applied on said bearing decrease the orbital eccentricity wherein minimum limit of orbital eccentricity is maintained through the working process. The device engagement of rolling parts is slack-free.

Abstract: In a gear train (10, 30) for an actuator, in particular of a vehicle seat (2), the gear train comprises a drive (11) that can be rotated about a rotational axis (A), at least one eccentric cam (12, 13) that is driven by the drive (11), a pinion (14, 15) that is driven by the eccentric cam (12, 13), a gear ring (16), which meshes with the pinion (14, 15) and in relation to which the pinion (14, 15) executes a rolling motion that defines a point of rolling contact (W), and a take-off drive (18) that taps the relative rolling motion. At least some sections of the material of the pinion (14, 15) and/or the ring gear (16) in the vicinity of the point of rolling contact (W) are elastically deformable, in order to produce surface contact at the point of rolling contact (W).

Abstract: A linear-to-torsional converter changes the linear motion imparted by a phaco handpiece to torsional or rotational motion. The converter attaches to the needle mount of a conventional linear handpiece. A lock can be used to defeat the torsional motion and restore linear motion without requiring the converter to be removed from the handpiece. Alternatively the converter can be built into a handpiece.

Abstract: A vertically movable slide unit for an operating machine includes a support structure, a slide slidably mounted along a vertical direction on the support structure and drive means of the vertical movement of the slide, carried by the support structure A safety device for preventing an accidental fall of the slide and operatively interposed between the slide and the support structure is foreseen, which is integrated within the slide.

Abstract: A servo drive system of a press machine has a pair of servo motors which can generate necessary ram pressure by compositing and using a torque based on the same speed-torque characteristics. The servo motors are symmetric with each other in a mirror image manner. The servo motors are opposed to each other at opposite ends of an operation shaft which vertically moves a ram. The servo motors are integrally operated, thereby directly driving the operation shaft.

Abstract: A device to be used with an adjusting element comprising a rod piston (3) displaceable with the aid of a motor (4) in a piston tube (2). The motor (4) is rotatably arranged at the adjusting element (1) through a worm gear (6), either directly or through a motor attachment (5), wherein the motor (4) extends in an extension plane in parallel with the piston tube (2), said worm gear (6) having a throat formation (7) for axial fixation of the position of the motor (4) in the adjusting element (1) while a free rotation of the motor (4) is practicable through 360° in order to make possible, in applications with limited space, an eligible position fixation of the motor (4) in a predetermined angle in relation to the adjusting element (1).