Abstract: A protection device for an actuator includes a buffer assembly assembled to an open end of a screw in the actuator. Thereby, when the actuator reaches its extension limit stop or retraction limit stop, the buffer assembly buffs excessive impact among internal components in the actuator.

Abstract: A linear actuator comprising a spindle (5) with a spindle nut (6), where the spindle (5) is driven by an electric motor (2) via a transmission (3,4), comprising a planetary gear (4). The construction is constructed in such a way that the spindle (5) is lead through the transmission (3,4) and is embedded by means of a ball bearing (20) in connection with a rear mounting (10), causing the axial forces to be lead through the transmission (3,4) via the spindle (5) and the ball bearing (20) to the rear mounting (10). This means that the construction is simpler and less voluminous and that the axial forces, moreover, are not transferred to the transmission.

Abstract: A linear actuator implements two contact switches for travel-limit control of an output shaft of the linear actuator and implements a variable resistor that is connected with a reduction gear of a motor of the linear actuator for providing a position feedback function.

Abstract: An actuator includes a base, a motor mounted on the base for driving a worm to rotate a worm gear of a transmission gear set that is set in an accommodation chamber inside the base and has a gear shaft pivotally inserted through the worm gear and fixedly mounted with an output gear, a brake module rotatable with said worm gear, a linking rod assembly having a driven gear meshed with the output gear, a screw rod rotatable with the driven gear, a movable member threaded onto the screw rod and an extension rod connected to the movable block and movable in and out of a sleeved outside the base upon rotation of the screw rod for biasing a crane beam of a lifting device.

Abstract: A valve actuator including a body, a rotatable drive screw having an external thread over at least a portion of its length and extending through the body and projecting out at least one side of the body. An internally threaded member is captured on the drive screw on the interior of the body, the member being held against rotation during rotation of the drive screw, so as to cause the member to travel along a length of the drive screw as the drive screw is rotated in both a first and second rotational direction. At least one sleeve having an abutment surface engagable by the member upon a sufficient rotation of the drive screw in one of the two directions. The sleeve surrounds the drive screw and may be axially adjustable relative to the drive screw from the exterior of the body.

Abstract: A high load and shock linear actuator is provided that may be used to position a hatch on a waterborne platform. The actuator includes a power-screw actuator, a manual operator, a bidirectional brake, an actuator motor, and a motor brake. The power-screw actuator is coupled to receive a drive torque from either the actuator motor or the manual operator, and is responsive to this drive torque to position the hatch. The bidirectional brake transfers manual input torque supplied to its input by the manual operator, and prevents torque supplied to its output from being transferred to its input. The actuator motor includes a stator, a rotor, a ring gear, and a differential carrier assembly. The differential carrier assembly is disposed within the rotor inner volume. The motor brake is mounted adjacent the actuator motor and selectively prevents and allows actuator motor rotation.

Abstract: An electromotive furniture double drive includes at least one drive motor, which is in driving engagement with a speed reduction gear train. An output element, which is secured against rotation, can be moved in its longitudinal direction by means of the speed reduction gear train. At least the speed reduction gear train and the output element are arranged in the housing, and the end positions of each output element are limited by at least one end switch. The output element and/or the housing has an adjustment device by means of which the position of the switching threshold of the at least one end switch can be adjusted from an area outside the housing.

Abstract: A linear actuator includes a housing formed of a first half shell and a second half shell and defining an accommodation chamber, a front opening in front of the accommodation chamber and a receiving chamber at the bottom side of the accommodation chamber, a driving mechanism having a push rod movably mounted in the accommodation chamber and extending out of the front opening, a motor mounted outside the accommodation chamber and a spindle coupled to and rotatable by the motor for causing the transmission shaft to reciprocate, and limit switches detachably mounted in the receiving chamber for stopping the motor upon movement of the transmission shaft to a front or rear limit position.

Abstract: A lead screw actuator for displacing holder with a collimator lens in an optical scanning device has a home-position for accurately determining the position of the collimator lens. An anti-seize construction is provided to avoid the holder to get stuck against the home-position due to the friction between both surfaces.

Abstract: A linear actuating element for the remote control of adjustable components on wind tunnel models includes a housing and a gear motor for driving a threaded spindle. On the threaded spindle a threaded nut for moving a pusher rod is arranged. The threaded spindle is connected to the gear motor by a chain drive, wherein the threaded spindle and a gear motor axle are arranged so as to be substantially anti-parallel. Due to the anti-parallel arrangement of the gear motor axle and of the threaded spindle, the linear actuating element on the one hand comprises a compact design. Consequently the linear actuating element is in particular suited to the remote control of adjustable components on wind tunnel models with small spatial dimensions. On the other hand the linear actuating element makes it possible to generate very considerable mechanical actuating forces while at the same time providing very good positioning and repetition accuracy.

Abstract: A linear actuator comprises an outer tube, an intermediate tube and an inner tube, and the tubes are all polygonal in cross section and are mounted orderly. The outer tube is disposed at the bottom thereof with a push device having a screw and a nut that are screwed with each other. The nut is engaged in the intermediate tube and is linked to move axially by the screw. The intermediate tube can be movably equipped with a pulling member, and the pulling member can link the inner tube to synchronously move in the axial direction. By such arrangements, the linear actuator allows the respective tubes to extend and retract axially relative to one another while preventing them from moving relative to one another in radial direction, thus achieving the stable and smooth axial movement.

Abstract: A linear actuator comprises an outer pipe, a middle pipe and an inner pipe, and the pipes are hollow polygonal pipes and are mounted orderly. A bottom of the outer pipe is disposed with a pushing device and a rolling device. The pushing device having a screw and a nut that are screwed with each other. A pulling member is driven to move the inner pipe and is fixed between the inner pipe and the outer pipe by cooperating with a pulley disposed on the middle pipe and a steel wire, such that the pipes can be synchronously moved in an axial direction. The steel wire winds around a rolling shaft of the rolling device, such that the steel wire can be loosened or tightened along with the pipes, enabling the pipes to extend or retract more stably.

Abstract: There are provided two kinds of nuts of a ball thread nut 20 and a non-ball thread nut 30 which is rotatable in synchronization with the ball thread nut 20 and in which a thread groove in rectangular or trapezoidal shape in section is formed. In a thread rod 10, two kinds of thread grooves are formed at the same pitch, one 11 of the thread grooves being in an arc shape in section so as to be meshed with the ball thread nut 20 through balls B and the other thread groove 12 being in a rectangular or trapezoidal shape in section so as to be meshed with the non-ball thread nut 30. When load is less than a predetermined value, the thread ridge of the non-ball thread nut 20 and the thread ridge 13 of the thread rod 10 are separated and are out of contact with each other so that the thread rod 10 is moved in the axial direction thereof by only the ball thread nut 20.

Abstract: Disclosed is an electric actuator capable of effectively absorbing shock exerted on its component part. The electric actuator has a housing, a rod cover, a piston, a feed screw, a sliding nut, two piston dampers for absorbing shock exerted on the piston, a first end damper attached to one of the opposite ends of the housing, a second end damper attached to the rod cover. The sliding nut is axially displaceable relative to the piston when the piston damper absorbs shock.

Abstract: By a linear actuator of the type comprising a driven spindle with a spindle nut, the outer positions and possibly also the intermediate positions of the spindle nut can be determined by a specially designed switch construction. This switch comprises an elongated conductor (8a), and next to this at least one other short conductor (8b), and where a connection element (10) for the spindle nut is equipped with an electric conductive element (9), for creating contact between the two conductors (8a, 8b). With two short conductors at the end of the elongated conductor end-stop switches for the nut are achieved and with more short conductors between the two end conductors the position of the spindle nut between its outer positions can be determined.

Abstract: A fast-releasing controlling device of an actuator includes a clutching means, a turning means and a pulling means. The clutching means is accommodated within a base of the actuator, and includes a fixing base and a clutch. The turning means is accommodated within the casing of the actuator and includes a swinging arm pivoted to the base. One end of the swinging arm is arranged to correspond to the clutch so as to control clutching action of the clutch relative to the fixing base. The pulling means includes a pulling rod assembly. One end of the pulling rod assembly is accommodated within the casing and connected to the swinging arm, and the other end thereof penetrates out of the casing and is joined with a connecting block.

Abstract: A bearing assembly includes a housing having a substantially round throughbore, a first side, and a second side. A sleeve bearing is situated within the throughbore. A first spring washer is situated adjacent the first side of the housing and the sleeve bearing, and similarly, a second spring washer is situated adjacent the second side of the housing and the sleeve bearing. A bushing extends into an opening of the first spring washer, an opening of the sleeve bearing, and the throughbore of the housing. A thrust washer is situated adjacent to the second spring washer and a fastener is situated adjacent to the thrust washer. A kit including the aforementioned components is also disclosed.

Abstract: A stop device is provided for a spindle drive which consists of a threaded spindle and a spindle nut with a stop. The stop device includes a limit stop and also a faceplate arranged between the stop of the spindle nut and the limit stop. The limit stop and the stop of the spindle nut are offset in relation to one another and are able to act upon the faceplate such that a bending moment can be applied to the faceplate when the threaded spindle and spindle nut of the spindle drive are in a limit stop position relative to one another.

Abstract: There are provided two kinds of nuts of a ball thread nut 20 and a non-ball thread nut 30 which is rotatable in synchronization with the ball thread nut 20 and in which a thread groove in rectangular or trapezoidal shape in section is formed. In a thread rod 10, two kinds of thread grooves are formed at the same pitch, one 11 of the thread grooves being in an arc shape in section so as to be meshed with the ball thread nut 20 through balls B and the other thread groove 12 being in a rectangular or trapezoidal shape in section so as to be meshed with the non-ball thread nut 30. When load is less than a predetermined value, the thread ridge of the non-ball thread nut 20 and the thread ridge 13 of the thread rod 10 are separated and are out of contact with each other so that the thread rod 10 is moved in the axial direction thereof by only the ball thread nut 20.

Abstract: Rotational motion of a male screw member is converted to linear motion of a female screw member that is screw engaged with the male screw member, thereby causing movement of a rod member for clamping an object. When a load from the object becomes larger than a predetermined value, and exceeds the frictional force of a viscous material and a friction plate, the female screw member is gradually turned and clamping continues while movement of the rod member is decelerated.

Abstract: A linear actuator (1) comprising a housing (6), a motor (2) comprising a stator with coils (4), a screw-nut system, and a rotor (5) axially and radially supported on the motor side by a bearing (11). The bearing comprises a ball (14) rigidly attached to the rotor, a cylindrical cavity (15) formed or positioned in the housing into which the ball (14) is inserted. A stop (17) is positioned in the cavity, supported in an axial direction of the rotor, against the ball (14) in essentially one point.

Abstract: A rotary shaft and a rotation driven member are connected as to transmit motive power when the rotary shaft rotates relatively to the rotation driven member. A roller gets displaced to a first position where a frictional force with an outer race and the rotation driven member decreases, thereby permitting transmission of a rotational force from the rotary shaft to the rotation driven member. When the rotation driven member rotates relatively to the rotary shaft, the roller gets displaced to a second position where the frictional force with the outer race and the rotation driven member increases, thereby rotationally fixing the rotation driven member with respect to the outer race. The power transmission from a brake apparatus to an electric motor can be hindered while permitting the power transmission to the brake apparatus from the electric motor by using either a worm exhibiting a relatively low transmission efficiency or a worm wheel.

Abstract: A mechanical method and assembly for actuator travel limit substantially comprises at least one limit switch placed in a travel of a linear machine, a starting device associated to said linear machine for activating the limit switch, and a linker for connecting said linear machine and starting device. When the linear machine arrives at the limit position and a jog occurs, said linker eliminates the displacement of the starting device caused by the jog and retains the starting device connecting with the limit switch.

Abstract: A telescopic actuator has a lead screw and one or more concentric or tiered screws. Each screw has one or more tangential interference stop features such as stop cogs. As the lead screw is rotated, it translates out of the concentric screws. As the lead screw reaches its maximum extension, a tangential interference stop feature on the lead screw tangentially contacts a tangential interference stop feature on the concentric screw with which the lead screw is threadably engaged. Upon tangential contact, the associated concentric screw rotates in unison with the lead screw. When there are additional concentric screws, as each concentric screw reaches its maximum extension, the system of tangential contacting of tangential interference stop features causes the other concentric screws to extend out in sequential fashion.

Abstract: A tie rod jam nut includes a tubular body having an axial bore for receiving a tie rod. A locking portion at a first end of the body can engage the tie rod and a threaded portion of a connecting component attached to the tie rod to lock the connecting component to the tie rod as the locking portion is rotated in one direction and disengage the tie rod to unlock the connecting component when rotated in an opposite direction. An engagement portion is spaced distally from the locking portion toward a second end of the tubular body. The engagement portion can be rotated to remotely rotate the locking portion between the locked and unlocked positions.

Abstract: An electric actuator comprises a gear mechanism which transmits the rotary driving force of a rotary driving source, and a ball spline mechanism which includes a ball spline shaft provided movably back and forth from a connecting block to the outside and which converts a rotary motion transmitted by the gear mechanism into a rectilinear motion. The electric actuator has a ball spline nut which is externally fitted to the ball spline shaft to be meshed with the gear mechanism and which is integrally formed with a gear section having a plurality of teeth arranged circumferentially about the gear section.

Abstract: The invention concerns a piston wherein the mobile screw (2) is engaged in the bolt (8) integral with the mobile assembly (1). It is provided with a cylindrical axial housing (10) wherein is engaged the rod (7) integral at its front end with the expander assembly (4). At the end of its front travel, the rod is retained by its flange (19) pressed on the stop (11) such that the expanding ring (5) is compressed by the thrust of the piston body (3) and causes the flexible envelope (6) to expand.

Abstract: A support pole for raising and lowering a supported object between a lower position and an elevated position is disclosed. The support pole includes an elongate pole and a carriage mounted for translational movement up and down the pole. Carriage locks at the top of the pole engage the carriage in the elevated position to prevent vibration of the supported object, and a stabilizer frame within the channel minimizes vibration during carriage transport. One or more electrical conductors are fixed in place, extending through at least a portion of the pole, terminating in an electrical contact for releasable engagement with a cooperating electrical contact mounted to the carriage as the carriage is raised into the elevated position.

Abstract: An actuator system for shifting a control device that is pressure-loaded in the direction opposite the shift direction. The actuator system comprises an actuator element capable of being axially moved in the shift direction within a system enclosure by a rotating spindle of an advance mechanism. The rotating spindle is connected to a rotating sleeve that is pivot-mounted in the system enclosure and surrounds the rotating spindle. The rotating sleeve is locked in position in the direction opposite the direction of advance rotation of the rotating spindle by a volute spring. The volute spring is associated with an emergency release unit for resetting the actuator element against the shift direction. The emergency release unit comprises a tensioning sleeve for the volute spring. The tensioning sleeve rotates between a tensioned and a relaxed position and is pressure-loaded in the direction of its relaxed position. The volute spring is releasably retained in the tensioning sleeve's tensioned position.

Abstract: An improved linear actuator incorporates a DC motor whose stator is secured to a frame is provided for. To improve operational longevity and reliability of a linear actuator, the improved actuator includes a retention clutch and an axial load limiter. An axially configured retention clutch is configured to slidably fit within the open inner channel diameter of an axial load limiter and over a motor shaft of a linear actuator. In operation, the retention clutch reduces the impact loads on the stop and extending the fatigue life of these wearable components. Similarly, when the screw encounters axial loads during operation, these loads are distributed across both the axial load limiter and the motor, thereby reducing direct forces on the motor and contributing to an extended use of the motor component.

Abstract: An electric actuator having an in-line rotation shaft, electric motor and encoder in which the encoder shaft, the motor shaft and the rotation shaft is concentric and integrally formed.

Abstract: A nut member 5 for moving forward and rearward by rotating a feed screw 4 by a stepping motor 28 and a transfer table 7 for transferring a workpiece W are elastically connected by a spring means 24 in transferring of the workpiece to thereby allow the nut member 5 to overrun by flection of the spring means 24, to allow the stepping motor 28 to rotate excessively in a cushioned manner, and to obtain a thrust for pushing the workpiece against an object after the transfer table 7 reaches the transfer end of the workpiece.

Abstract: A stop apparatus for a gear actuator includes a traveling stop nut that has adjustable positions and travels on a screw on an input shaft. The stop nut is mounted to threadably travel on the stop screw. A stop guide is attached to the stop screw and prevents rotation of the stop screw relative to the gear actuator and permits longitudinal travel of the stop screw during rotation of the input shaft. The stop nut abuts a stop surface upon a predermined amount of rotation of the input shaft to prevent further rotations.

Abstract: A support pole for raising and lowering a supported object between a lower position and an elevated position is disclosed. The support pole includes an elongate pole and a carriage mounted for translational movement up and down the pole. Carriage locks at the top of the pole engage the carriage in the elevated position to prevent vibration of the supported object, and a stabilizer frame within the channel minimizes vibration during carriage transport. One or more electrical conductors are fixed in place, extending through at least a portion of the pole, terminating in an electrical contact for releasable engagement with a cooperating electrical contact mounted to the carriage as the carriage is raised into the elevated position.

Abstract: A multiple extend ball screw and nut linear actuator incorporates a revolvable axially restrained ball screw with a ball nut thereon. A constant speed reversible drive revolves the screw to move the ball nut forwardly and rearwardly. External helical threads of the same hand as the ball nut threads are provided externally on the ball nut but have a substantially reduced lead. A second rotatably restrained nut having threads matching the external threads on the ball nut mounts on the ball nut and connects to the system to be actuated.

Abstract: This injector head 1000 comprises a plunger 20 capable of reciprocating in a direction of movement of a piston 1a in a syringe 1, a plunger drive 500 for converting rotary motion of a plunger motor 2 to linear motion in order to supply reciprocation to this plunger 20, and a safety device 600 as safety means for restraining rotation of a rotary shaft 2a of the plunger motor 2 when the plunger 20 moves beyond a predetermined position. Thus, it is possible to provide a medical injector head attaining miniaturization and simplification of the apparatus while keeping a mechanical safety mechanism.

Abstract: An electric actuator comprises a gear mechanism which transmits the rotary driving force of a rotary driving source, and a ball spline mechanism which includes a ball spline shaft provided movably back and forth from a connecting block to the outside and which converts a rotary motion transmitted by the gear mechanism into a rectilinear motion. The electric actuator has a ball spline nut which is externally fitted to the ball spline shaft to be meshed with the gear mechanism and which is integrally formed with a gear section having a plurality of teeth circumferentially.

Abstract: A system for raising and lowering a sectional overhead door between an open position and a closed position including, a counterbalance system adapted to be connected to the door, an operator motor assembly mounted proximate to the sectional overhead door in the closed position of the sectional overhead door, at least a portion of the operator motor assembly movable between a door operating position and a door locking position, and a locking assembly (370) having an engaged position to hold the motor assembly in the operating position and a disengaged position to release the motor assembly allowing it to move to the door locking position. The system may be provided with a remote light assembly having a switchable light source in sensing communication with the operator motor such that operation of the motor activates the light source.

Abstract: A multiple extend ball screw and nut linear actuator incorporates a revolvable axially restrained ball screw with a ball nut thereon. A constant speed reversible drive revolves the screw to move the ball nut forwardly and rearwardly. External helical threads of the same hand as the ball nut threads are provided externally on the ball nut but have a substantially reduced lead. A second rotatably restrained nut having threads matching the external threads on the ball nut mounts on the ball nut and connects to the system to be actuated.

Abstract: The invention concerns a piston wherein the mobile screw (2) is engaged in the bolt (8) integral with the mobile assembly (1). It is provided with a cylindrical axial housing (10) wherein is engaged the rod (7) integral at its front end with the expander assembly (4). At the end of its front travel, the rod is retained by its flange (19) pressed on the stop (11) such that the expanding ring (5) is compressed by the thrust of the piston body (3) and causes the flexible envelope (6) to expand.

Abstract: An assembly comprises a spindle and a moving nut disposed on the spindle. The spindle and the moving nut are made of plastics. At least one of the two components spindle and moving nut being resilient such that the moving nut is prevented from getting stuck on the spindle. There is further proposed an actuator including such assembly.

Abstract: An integrated circuit tester includes a fail-safe mechanism for moving an integrated circuit chip between an initial position where the integrated circuit chip is inserted into the tester, and a test position where the integrated circuit chips is actually tested. This fail-safe mechanism includes a motor and a shaft which the motor rotates to move the integrated circuit chip. An electronic control circuit can be included to automatically stop the motor when the integrated circuit reaches its initial position, or its test position; but if the control circuit fails to operate properly, then damage to the integrated circuit tester is prevented by the fail-safe mechanism.

Abstract: A system for raising and lowering a sectional overhead door between an open position and a closed position including, a counterbalance system adapted to be connected to the door, an operator motor assembly mounted proximate to the sectional overhead door in the closed position of the sectional overhead door, at least a portion of the operator motor assembly movable between a door operating position and a door locking position, and a locking assembly (370) having an engaged position to hold the motor assembly in the operating position and a disengaged position to release the motor assembly allowing it to move to the door locking position. The system may be provided with a remote light assembly having a switchable light source in sensing communication with the operator motor such that operation of the motor activates the light source.

Abstract: A cable or another longilinear transmission component (4) is set (3) into the centre of an axial cavity (2) of a screw (1) belonging to a screw and nut movement conversion unit. By means of this arrangement, bending moments exerted on the screw between the point of attachment of the component (4) and the nut have only a small value, which guarantees the screw (1) against bending and sticking and the whole mechanism against excessive friction.

Abstract: There is described an actuator comprising an outer tube and an inner tube. In the actuator there is provided a spindle co-operating with a bushing for creating the displacement of the actuator by means of a motor. In order to establish an end stop in a secure way for preventing a wedging of the spindle and the bushing in extreme positions for the actuator, the bushing is disposed rotatable in relation to both tubes as it is arranged rotatable in a bushing housing. The actuator is arranged so that friction between the bushing and the bushing housing is greater that the friction occurring between the spindle and the bushing. Hereby rotation of the spindle will displace the bushing along the spindle until it reaches an extreme position. By an extreme position a pin on the bushing will hit a pin mounted in the spindle.

Abstract: A buffering mechanism comprises a block member which is installed detachably in an actuator body, a piston which compresses air in a compressing chamber when a movable element abuts against the piston, and a check valve and a variable throttle valve which are provided in a passage for communication between the compressing chamber and the outside of the actuator body and which adjust a flow rate of the air discharged to the outside.

Abstract: An electromotive adjustment assembly, includes at least two spindles disposed in parallel spaced-apart relationship, and a motor unit coupled in driving relationship with the spindles for operating the spindles.

Abstract: A spindle drive for adjusting structural components of a motor vehicle seat relative to one another includes a casing having opposite end walls with openings therein, a spindle nut disposed in the casing and having a pair of opposite ends and an internally threaded bore extending therethrough between the opposite ends and generally aligned with the openings in the opposite end walls of the casing, an externally threaded spindle extending through the casing and openings of the end walls thereof and also threadably received through the internally threaded bore of the spindle nut so as to extend in opposite directions from the opposite ends of the spindle nut, the spindle having an end stop attached thereon such that one of the opposite ends of the spindle nut faces toward the end stop on the spindle, and at least one collar attached to and extending outwardly from the one end of the spindle nut and about the spindle and having an end surface facing toward the end stop on the spindle such that as the spindle is

Abstract: A motor shaft for a rotational-to-direct motion converting motor has a rotation stopping portion formed in a plate shape, and a screw portion formed in a columnar shape. In addition, the motor shaft has a hole, arranged in an end portion of the motor shaft in a longitudinal direction of the motor shaft, for positioning the motor shaft in a form rolling. Therefore, a position shift or a phase shift of thread ridges formed on the screw portion can be prevented.

Abstract: A linear actuator for providing linear motion of an output shaft member and automatically disconnecting the shaft from a gear train comprising a rotatable shaft adapted to be coupled to an electrically powered gear train for causing rotation of the shaft; a shaft member mounted onto the rotatable shaft and axially moveable between a retracted position and an extended position in response to rotation of the shaft; a rotatable screw co-acting with the gear train to rotate in response to movement of the gear train; a second member mounted on the rotatable screw and axially moveable in response to rotation of the screw between the retracted position and the extended position; a switch unit located at at least one of the extended and retracted positions and responsive to engagement with the moveable second member for causing an electrical disconnection between the gear train and a power source to cause termination of shaft rotation; and a member coupled to the rotatable shaft for disconnecting the shaft from the g