Abstract: According to a steering column for a vehicle according to the present embodiments, a wide convenient space can be secured for a driver in a teles-in state by increasing a teles-stroke while securing an installation space for the steering column, the installation of the steering column is spatially convenient despite the increased teles-stroke, and a teles operation can be quickly performed without increasing the output of a motor, and thus a convenient space can be quickly secured for a driver without degraded noise performance.

Abstract: A steering column assembly is disclosed that comprises: a housing having outer, intermediate and inner elongate, telescopically mounted housing portions movable relative to one another along an adjustment axis; a steering column rotatably mounted in the inner elongate housing portion and being configured at one end for attachment of a steering member (e.g.

Abstract: A steering column assembly comprises: a housing having outer, intermediate and inner elongate, telescopically mounted housing portions movable relative to one another along an adjustment axis; a steering column rotatably mounted in the inner elongate housing portion and being configured at one end for attachment of a steering member (e.g. a steering wheel); a leadscrew rotatably mounted on one of the inner and outer housing portions and having first and second threaded portions which overlap each other for at least part of the length of the leadscrew; a motor for rotating the leadscrew; a first displacement member screw-threadedly mounted to the first threaded portion of the leadscrew and connected to the outer or inner elongate housing portion on which the leadscrew is not rotatably mounted; and a second displacement member screw-threadedly mounted to the second threaded portion of the leadscrew and connected to the intermediate housing portion.

Abstract: A damping system for a linear actuator, and a linear actuator. The damping system has a first sub-assembly with a first axial stop surface and a second axial stop surface. A spring-elastic spring arrangement has an initial position at a predetermined pretensioning and is axially in contact with the first and second stop surface. A second sub-assembly is mounted axially displaceable relative to the first sub-assembly and is configured to lift the spring arrangement away from the first stop surface or from the second stop surface in the case of an axial movement relative to the first sub-assembly.

Abstract: A linear transmission device includes a screw, a moving member, a return element, and a sensor. The moving member is set in the screw to form a load path therebetween. The return element is set in the moving member and has a return path connected to the load path. The return path and the load path constitute a circulating path for balls to run. The moving member has an internal thread with an ineffective thread section. The moving member has a receiving groove adjacent to the ineffective thread section. The sensor is embedded in the receiving groove of the moving member without affecting the operation of the balls. Thus, the linear transmission device of the present invention can solve the problem of the sensor protruding from the moving member, so that the configuration of the surrounding space and the stroke of the moving member will not be affected.

Abstract: A device for adjusting an object, for example a roll in a roll stand including a rotatably mounted pressure spindle and a torque motor having a stator and a rotor for rotationally driving the pressure spindle. In addition, the device includes a fixedly arranged pressure nut, which is engaged with the pressure spindle in a rotationally coupled manner via a thread to generate an axial movement of the pressure spindle in case of its rotation. Due to the axial movement generated in this way, the device can generate an axial adjustment force and transmit it to the object to be adjusted.

Abstract: An embodiment includes an exoskeleton robotic system including: a first linkage; a bearing coupled to the first linkage; a joint including a motor configured to move the first linkage along the bearing; an axial load sensor configured to sense an axial force transmitted to the axial load sensor via the joint, the axial force including one of tension or compression but not torque; a bracket including first and second bracket locations and first and second arms; and a housing that includes at least part of the joint and which couples the bracket to the bearing. The bracket couples to the housing at the first bracket location and couples to the axial load sensor at the second bracket location. The first arm couples the second arm to the first bracket location, and the second arm couples the first arm to the second bracket location.

Abstract: A screw actuator having a screw shaft and a nut arrangement is described herein, the nut arrangement comprising: a primary nut; a first secondary nut having a first thread; a second secondary nut having a second thread; and a first attachment means. The first nut, first secondary nut, and second secondary nut are connected to the first attachment means with a first, initial, axial spacing between the first and second secondary nuts. The first secondary nut is mounted to the first attachment means via bearings that allow the first secondary nut to rotate relative to the first attachment. The first secondary nut is connected to the second secondary nut via a screw thread connection having a pitch lower than a pitch of a screw thread of the screw actuator shaft.

Abstract: A ball screw, including: a spindle supported for rotation around an axis of rotation; a ball nut radially disposed around the spindle, axially displaceable with respect to the spindle, and including a helical protrusion, the helical protrusion defining a helical groove; a plurality of balls disposed in the helical groove and in contact with the spindle; a reset spring including a portion located in the helical groove and an end portion extending past the helical groove in a circumferential direction around the axis of rotation; and a retaining device directly connected to the ball nut and arranged to limit displacement of the end portion of the reset spring in a first axial direction parallel to the axis of rotation. For a first circumferential position of the spindle around the axis of rotation, the reset spring urges the plurality of balls in a second axial direction, opposite the first axial direction.

Abstract: A ball screw drive (10) including a threaded spindle (12) having a first, free end (16) and a second end (17) which can be connected to a drive, and a spindle nut (14) at least partially enclosing the threaded spindle (12) coaxially. A plurality of balls (26) recirculate in the space between the threaded spindle (12) and the spindle nut (14) form the core element. An extension sleeve (15), which connects coaxially to the spindle nut (14), is fixedly connected to the latter and moves together with it relative to the threaded spindle (12). At the first end (16) of the threaded spindle (12), a substantially circular bearing ring (18, 30, 50, 70) is attached to the outer circumference of the threaded spindle (12), which circular bearing ring serves as a shaft bearing between the threaded spindle (12) and the extension sleeve (15) and which has a noise-dampening effect due to at least one integrated spring/damping element.

Abstract: An actuator includes an actuator main body, an operating shaft attached to a tail gate, a vehicle body-side socket that fixes the actuator main body to an attachment surface of a bracket, and a guide part installed between the attachment surface of the bracket and the vehicle body-side socket, wherein the vehicle body-side socket is fixed to the bracket via the guide part, and the guide part restricts rotation of the vehicle body-side socket about an arbitrary straight line crossing a line in a direction normal to the attachment surface.

Abstract: 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.

Abstract: A ball screw device includes a cylinder that surrounds the outer periphery of a ball nut. Accommodation holes are formed in the ball nut at a rolling start position and a rolling end position in ball rolling paths. An outer periphery turning groove is formed in an outer peripheral face of the ball nut, and the outer periphery turning groove and an inner peripheral face of the cylinder constitute a turning rolling path. The turning rolling path and connection passages formed in deflectors constitute a circulation path through which balls are returned from the rolling end position to the rolling start position.

Abstract: At least a rotor fixing portion and a bearing fitting portion are combined to form a hollow rotary shaft. The rotor of a rotary motor portion is fixed on the rotor fixing portion. A thrust radial bearing is fitted on the outer periphery of the bearing fitting portion and a screw nut is fitted to the bearing fitting portion. The rotor fixing portion and the bearing fitting portion are coupled with screw member(s) which are inserted into the hollow rotary shaft from one axial end of the hollow rotary shaft and axially extend inside the bearing fitting portion and the rotor fixing portion. A flange portion of the screw nut is fixed on an abutment portion of the bearing fitting portion in abutment with an end surface of an inner race of the thrust radial bearing that is located on the one axial end side.

Abstract: A casing running tool is connected to a top drive with a clutch that operates with set down weight against a spring resistive force. Setting down weight with rotation in a first direction raises an actuation member that pushes the slips out radially. The weight of the string then keeps the slips in position so that the string can be picked up and the rig floor slips removed followed by lowering the string while circulating and rotating. With slips set inside the joint and the string hanging free, rotating the top drive rotates the string as the string is lowered. With slips again supporting the string on the rig floor the top drive can be rotated in an opposed direction with weight set down to back off the slips and to remove it from the top joint.

Abstract: A linear slide is provided. The linear slide includes a guide rail, a carriage arrangement and a drive mechanism. The carriage arrangement includes a sidecar or nut arrangement for engagement with a screw of the drive mechanism. The nut arrangement is laterally offset from a carriage of the carriage arrangement.

Abstract: A telescopic actuator comprising a cylinder having a structure for coupling the cylinder to a first external element a rod mounted to slide telescopically in the cylinder along a sliding axis and including a structure for coupling it to a second external element and a lead screw mounted to rotate in the cylinder about the sliding axis and extending inside the rod to co-operate with a nut secured to the rod, such that rotating the lead screw causes the rod to slide. There also is a drive structure for driving the lead screw in rotation and a retention structure for axially retaining the lead screw. The retention structure holds a bearing of the lead screw captive in an axial direction and is arranged to retain the bearing of the lead screw with axial clearance suitable for absorbing movements imparted to the rod relative to the cylinder.

Abstract: A linear actuator that does not require a high assembly precision is provided. A linear actuator includes a motor portion including a rotary shaft, a rotor, and a stator, a first bearing portion that supports a first end of the rotary shaft, a locknut threadably engaged on the first end of the rotary shaft, and a ball screw mechanism including a ball screw nut screwed to the locknut and a ball screw threadably engaged with the ball screw nut. Gaps formed between an outer peripheral portion of the rotary shaft and an inner peripheral portion of the locknut, except a male thread portion formed on the rotary shaft and a female thread portion formed on the locknut threadably engaged with each other, are defined to have respective predetermined sizes.

Abstract: A ball screw which has a threaded nut arranged on a threaded spindle, a helical ball channel in which balls are arranged delimited by ball grooves of the threaded spindle and the threaded nut, a ball cage which receives the balls and a spring element which bears with one end against the threaded nut and with another end against the ball cage. The spring element is arranged axially adjacent to the ball cage in an annular gap delimited by the threaded nut and the threaded spindle.

Abstract: A female screw member 6 supported by a movable side bracket 31 includes: a movable side casing 61 provided with a nut container 67 through which a male screw shaft member 54 passes; and a pair of nuts 62 and 63 inserted into the nut container 67 non-rotatably but movably in an axial direction of the male screw shaft member 54 while threadedly engaging with the male screw shaft member 54. The movable side casing 61 includes a wedge member 64 whose tip end 64c is inserted between the nuts 62 and 63. The nuts 62 and 63 are separated from each other when the wedge number 64 is inserted therebetween, and outside surfaces 62c and 63c of female screw portions 62b and 63b of the nuts 62 and 63 come into contact with and get held by a male screw portion 54a of the male screw shaft member 54, thereby eliminating backlash between the female screw portions 62b and 63b and the male screw portion 54a.

Abstract: A drive cartridge comprises an actuating mechanism, in which a spindle can be guided in a hollow cylindrical drive element between two end positions at an axial distance from one another. The positions are defined by the axial length of the drive element. A dome-shaped casing surrounds the drive element in a non-rotatable and non-displaceable manner. The drive element has an external contour with an eccentric profile and the internal contour of the dome-shaped casing has a positive fit only in those areas of the drive element in which the permissible normal stress exceeds a predefined upper limit.

Abstract: The invention relates to a jack (4) for moving a movable panel of a vehicle, including: a endless screw and nut assembly (14) defining an axis (22); a bearing (20) in which an element (14) selected from the nut and the screw, for example the latter, is rotatably mounted; and a tensioner (60) which is force-tilted onto the element or onto the hearing and which biases the latter by means of mutual axial bearing when the jack is inoperative.

Abstract: A nut and lead screw assembly is disclosed. The nut includes a plurality of flexible fingers for adjusting the engagement of a threaded or unthreaded portion of the nut with corresponding threads of a lead screw. The engagement between the nut and the lead screw is adjusted by installing at least one radial compression member into a circumferential groove formed in the outer surface of the flexible fingers.

Abstract: A inverted spline rail system is provided. The inverted spline rail system includes a drive motor that rotates a drive screw. The drive screw has a associated nut body. The nut body includes a attachment portion that a user can attach a device that requires linear motion control. Furthermore, the nut body is located inside of a cylindrical body that encases the drive screw. The nut body has guide teeth that mate with an internally splined guide rail of the cylindrical body that contains both the nut and the drive screw. The reciprocating nature of the guide teeth of the nut and the internally splined guide rail of the cylindrical body translate the rotational motion of the drive screw into linear motion of the nut body. The inverted spline rail system is protected from its operating environment by a seal.

Abstract: An actuator comprises a rotatable nut arranged to be driven for rotation by a motor, an axially translatable shaft cooperable with the nut and arranged such that rotation of the nut drives the shaft for axial movement, and a steering rack coupled to the shaft by a coupling arrangement so as to be driven for axial movement by the shaft, wherein the coupling accommodates limited relative lateral movement between the shaft and the steering rack.

Abstract: A lead screw nut support arrangement includes a wall having a width and a through hole that passes through the wall. A support bushing passes through the through hole in the axial direction, leaving an amount of play, and having a length greater than the thickness of the wall. The support bushing is supported in the through hole movably in the axial direction. A lead screw nut is also included whose end face adjoins a first end face of the support bushing on the inner side of the wall. The support arrangement also includes a mount that braces a second end face of the support bushing against the lead screw nut such that the lead screw nut is elastically loaded in the direction away from the wall.

Abstract: The present invention provides a screw device which takes a heavy load in one direction along the axis of the screw shaft and only a light load in the opposite direction, the screw device capable of providing ease of control of preloading. The screw device of the present invention has a screw shaft 1 with an outer surface having a ball rolling groove 1a for rolling balls 7 and a roller rolling groove 1b for rolling rollers 6 both spirally formed thereon; a ball nut 4 with an inner surface having a ball rolling groove 4a spirally formed thereon facing the ball rolling groove 1a of the screw shaft 1; a roller nut 5 with an inner surface having a roller rolling groove 5a spirally formed thereon facing the roller rolling groove 1b of the screw shaft 1; a plurality of balls 7 arranged between the screw shaft 1 and the ball nut 4; and a plurality of rollers 6 arranged between the screw shaft 1 and the roller nut 5. The ball nut 4 and the roller nut 5 are connected along an axis of the screw shaft 1.

Abstract: A nut and lead screw assembly that includes a nut are provided. The nut includes at least one flexible finger for adjusting the engagement of a threaded portion of the nut with corresponding threads of a lead screw. The threaded portion is preferably formed of a different material than the flexible finger. The material of the threaded portion is preferably of a lower coefficient of friction than the flexible finger. The nut also includes an adjustment mechanism that adjust the radial position of the flexible finger and also the threaded portion. A preferred adjustment mechanism includes a spring finger that provides a radially extending biasing load to a free end of the flexible finger to adjust the position of the flexible finger. The adjustment mechanism more preferably includes a an adjustment member that adjusts the radial load provided by the spring finger.

Abstract: A nut for a lead screw assembly, a lead screw assembly and a method for preventing backlash in a lead screw assembly are provided. The nut of the lead screw assembly includes a one-way clutch that permits relative motion of between two nut bodies in a first direction but prevents relative motion in an opposite direction. The one-way clutch preferably includes at least one sprag element that acts between the two nut bodies to permit or prevent relative motion between the two nut bodies of the nut. The lead screw assembly generally incorporates a nut incorporating such a nut. The method generally includes binding the first nut body relative the second nut body to prevent relative motion of the nut bodies in one direction while permitting relative motion in an opposite direction.

Abstract: An actuator for a motor vehicle with an electric motor having an output shaft, a gearbox that is connected to the output shaft that includes a spindle nut, and a spindle that engages the spindle nut. The spindle nut comprises one main portion and at least one axial socket. The axial socket: (a) is solidly connected to the main portion, more specifically is integral with the main portion, (b) comprises an internal thread cooperating with the spindle and (c) is configured to be radially elastic. An elastic element is provided which fits against the axial socket and pushes the internal thread thereof into engagement with the spindle.

Abstract: An actuator in one embodiment includes a threaded shaft; a shaft engaging portion coupled to the threaded shaft, the shaft engaging portion being moveable in a direction parallel to an axis of the threaded shaft upon a relative rotation between the threaded shaft and the shaft engaging portion; and a ceramic bushing coupled to the shaft engaging portion, the bushing encircling the threaded shaft.

Abstract: A motorized anti-backlash linear actuator comprises a motor; a hollow shaft that is rotated about a central axis by the motor, an anti-backlash nut that is nested at least partially inside the hollow shaft; and an externally threaded rod or lead screw that engages with the anti-backlash nut such that the rotation of the hollow shaft and the nut imparts a linear motion to the rod that is substantially free of backlash. Nesting the anti-backlash nut at least partially within the hollow shaft provides greater stability to the actuator, and permits high speed operation.

Abstract: In a preferred embodiment, an apparatus, including: a first nut half (40) and a second nut half (42) each having internal threads (50, 52) complementary with threads on a screw inserted therein; the first nut half (40) and the second nut half (42) having first and second tapers (60, 62), respectively, defined therearound in adjacent surfaces thereof on proximal portions of the first nut half (40) and the second nut half (42); an annular retaining ring (80, 200, 220) having complementary third (92) and fourth (94) tapers defined therearound, with the first taper (60) engaging the third taper (92) and the second taper (62) engaging the fourth taper (94); and biasing apparatus (110, 180, 266) forcing the annular retaining ring (80, 200, 220) inwardly, thus eliminating backlash.

Abstract: A rolling element screw device is provided with a power transmission mechanism for moving a retainer ring 14 in an axial direction in accordance with lead angles of spiral grooves 11a, 12a while rotating the retainer ring 14 in a condition of maintaining a constant relationship with respect to a rotational phase of a rotating side member in accordance with the rotation of the rotating side member. The power transmission mechanism is provided with an external tooth 17 formed to a screw member 11, an internal tooth 18 formed to a nut member 12 and a plurality of planetary gears 19 held to be rotatable to circumferentially predetermined positions of the retainer ring 14 in a condition meshed with the external tooth 17 and the internal tooth 18, respectively, the external tooth 17 is formed so as not to overlap with the screw side spiral groove 11a formed to the screw member 11, and the internal tooth 18 is formed so as not to overlap with the nut side spiral groove 12a formed to the nut member 12.

Abstract: A track system (18) of the type used to adjust the position a supported element such as vehicular seat (12) includes a pair of base rails (20) that slidably interact with a respective pair of driven rails (22). A transverse rail (24) is attached to each of the driven rails (22) so that the driven rails (22) slide together as a unit. A motor (34) is supported on the transverse rail (24) and includes a pair of drive shafts (36) emanating from either end. The drive shafts (36) carry on their distal ends' respective worm gears (38) which are contained within a transmission assembly (26). The worm gears (38) mesh with external teeth on respective drive nuts (54) which interact with a lead screw (28) that can be oriented to either remain stationary relative to the base rails (20) or can be rotatably fixed within the driven rails (22). The drive nut (54) is prevented from causing objectionable noise and premature wear in operation by the inclusion of one or two compressible washers (66).

Abstract: A drive mechanism include a movable element which has at least one bearing arm; a linear guide shaft for linearly guiding the movable element without rotating; a driving device driving the movable element linearly along the linear guide shaft; a driven member driven, by the driving device, in a direction parallel to the linear guide shaft; a first guide hole formed on the bearing arm; a second guide hole formed on the driven member, the first and second guide holes being identical in size and in cross sectional shape; a tubular bearing member fitted into the first and second guide holes, the linear guide shaft being fitted completely through the tubular bearing member to be freely slidable therein; and a retaining device formed on the tubular bearing member and the driven member to prevent the tubular bearing member from moving relative to the driven member.

Abstract: Provided are a steering device and a feed screw mechanism. The steering device is made so easy in the adjusting work of a backlash that it can eliminate the backlash reliably, even if the precision of the thread of a feed thread shaft or a feed nut is poor, thereby to improve the rigidity and to reduce the manufacturing cost of the feed screw mechanism. An upper-side end portion feed nut is urged upward of FIG. 8 by an upper-side disc spring so that an upper-side flank face of the thread ridge of the upper-side end portion fee nut is brought into close contact with the lower-side flank face of the thread ridge of a feed screw shaft. On the other hand, a lower-side end portion feed nut is urged downward of FIG. 8 by a lower-side disc spring so that a lower-side flank face of the thread ridge of the lower-side end portion fee nut is brought into close contact with the upper-side flank face of the thread ridge of the feed screw shaft.

Abstract: Ball screw having a spindle nut (2) arranged on a spindle (1), together with balls (3) which are arranged in a series and are capable of rolling in a helical ball track (4), the helical ball track (4) being defined by a thread groove (5) formed on the spindle (1) and by a thread groove (6) formed on the spindle nut (2), the balls (3) arranged in a series being returned in a return duct (7) from an outlet end to an inlet end of the helical ball track (4), the divided circle end play of the series of balls being less than or equal to 0.3 millimeters or the ratio between the pitch of the helical ball track (4) and the diameter of the balls (3) ranging from 1.02 to 1.2 or the thread grooves (5, 6) of the spindle nut (2) and of the spindle (1) in each case having a gothic profile (8, 9), a pressure angle formed by the balls (3) in contact with the gothic profile (8, 9) ranging from 15 to 35 degrees.

Abstract: A planetary gear train having planetary gears (8) which are rotatably mounted on a planet carrier (18) and are in toothed contact with an internally toothed ring gear (14) and a sun gear (4). For a simplified, process-safe and inexpensive backlash of the planetary gears (8) without axial displacement of the sun gear (4), the ring gear (14) and the planetary gears (8) are conically designed so that planetary gear axles (16) are retained in the planetary gear carrier (18) at an inclined angle (a) and that the planetary gears (8) are axially movably disposed upon and coordinated with the planetary gear axles (16) and the position of the planetary gears (8) can be adjusted within the planetary train by adjusting mechanisms for adjusting a backlash.

Abstract: A fixed torque preload piece is positioned between two nuts of a ball screw, the preload piece is formed with through hole located in an axial direction of the two nuts for receiving at least two steel balls. Two terminal openings of each of the through holes are defined in the surfaces of the preload piece facing the two opposite nuts. Three radial threaded holes are formed in the outer periphery of the preload piece, and the threaded holes are vertical to and in communication with the through holes. An adjusting member, an elastic member and an adjusting screw are received sequentially in the respective threaded holes. The steel balls in the through holes are pushed against the two nuts by the arc-shaped abutting surface of the adjusting member, the pushing of the steel balls can produce an adjustable preload, and can absorb the sudden increase of the pressure effectively, thus obtaining the objective of the present invention of outputting torque stably.

Abstract: A lead screw assembly having a lead screw rotatable within a hollow tubular portion of a reinforcing rail. A nut engages with threads of the lead screw and is movable along the reinforcing rail. The lead screw includes plurality of first threaded portions having an outer diameter and extending lengthwise of the lead screw; and at least one second gap portion having an outer diameter that is less than the outer diameter of the first threaded portions. The second gap portion is positioned between adjacent first threaded portions of the lead screw. At least one generally U-shaped bearing is secured within the reinforcing rail and contacts the lead screw at a second gap portion. Each U-shaped bearing supports the lead screw along its length as the screw rotates within the rail, so that the lead screw assembly can be safely operated at high speeds over comparatively long distances while minimizing whipping and vibration of the lead screw.

Abstract: A nut for a lead screw assembly, a lead screw assembly and a method for preventing backlash in a lead screw assembly are provided. The nut of the lead screw assembly includes a one-way clutch that permits relative motion of between two nut bodies in a first direction but prevents relative motion in an opposite direction. The one-way clutch preferably includes at least one sprag element that acts between the two nut bodies to permit or prevent relative motion between the two nut bodies of the nut. The lead screw assembly generally incorporates a nut incorporating such a nut. The method generally includes binding the first nut body relative the second nut body to prevent relative motion of the nut bodies in one direction while permitting relative motion in an opposite direction.

Abstract: A ball screw, which improves its durability under circumstances where a radial load and a moment load are applied to it, has a screw shaft (2) formed with a helical screw groove (2a) on its outer circumferential surface. A nut (3) is adapted to mate with the screw shaft (2). The nut (3) is formed with a helical screw groove (3a) on its inner circumferential surface. The nut helical screw groove (3a) corresponds to the screw shaft screw groove (2a). A number of balls (4) are rollably contained within a ball rolling passage formed by the oppositely arranged screw grooves (2a, 3a). Bridge members (5), each formed with a connecting groove (5a) on its inner circumferential surface, connect the screw grooves (3a) of the nut (3). A contact angle (?) between each ball (4) and one or both the screw grooves (2a, 3a) is set within a range of about 20˜40°.

Abstract: An anti-backlash nut mechanism includes two segmental nuts composing a nut which are not separated when the nuts are disengaged from a male screw. An anti-backlash nut has a main nut and a trailing nut which can be engaged with a common male screw, a coil spring for biasing the main and trailing nuts away from each other, a cylindrical portion formed in conjunction with the main nut so as to surround the lead screw, an insert portion formed in conjunction with the trailing nut to be inserted into the cylindrical portion, pins projecting in the radial direction from either one of the cylindrical portion and the insert portion, and grooves formed around the other one of the cylindrical portion and the insert portion so as to receive the pins from the edge of the cylindrical portion and to engage with the pins in the turning direction of the nuts.

Abstract: The present invention relates to a sliding screw arrangement (14) for transformation of the rotational movement of a threaded axis (13) into a linear movement of the sliding screw providing minimized tolerances for variations of the screw position in both radial and axial direction and providing minimized friction when moving the sliding screw arrangement along said threaded axis. The screw arrangement consists preferably of two parts (20, 30) and comprises a first resilient part, e.g. a spring (143), to compensate tolerances axial direction and a second resilient part, e.g. a resilient tongue (25), and tracks (28) to compensate tolerances in radial direction. The screw hollowness through which the threaded axis is guided is at its inside is equipped with semi-spheres (21,31) that follow the turn of a thread of the axis.

Abstract: A threaded drive has a threaded spindle having a longitudinal axis, a supporting nut which is in a screw engagement with the threaded spindle with a first clearance and which is rotatable relative to the threaded spindle about the longitudinal axis, a catch nut which is in a screw engagement with the threaded spindle with a second predetermined clearance which is greater than the first predetermined clearance, the catch nut being freely rotatable relative to the supporting nut, and also being bringable in a clamping engagement with the supporting nut and fixable on the supporting nut in any desired relative rotary position.

Abstract: An actuator including a threaded shaft and a carriage having a shaft engaging portion coupled to the threaded shaft. The carriage is moveable in a direction parallel to an axis of the threaded shaft upon a relative rotation between the threaded shaft and the shaft engaging portion. A ceramic bushing is coupled to the shaft engaging portion of the carriage, the bushing surrounding the threaded shaft. The ceramic bushing is much harder than heretofore used materials and results in greatly reduced particulate formation. The carriage or portion thereof can be formed around the bushing, e.g., by injection molding.

Abstract: A motorized anti-backlash linear actuator comprises a motor; a hollow shaft that is rotated about a central axis by the motor, an anti-backlash nut that is nested at least partially inside the hollow shaft; and an externally threaded rod or lead screw that engages with the anti-backlash nut such that the rotation of the hollow shaft and the nut imparts a linear motion to the rod that is substantially free of backlash. Nesting the anti-backlash nut at least partially within the hollow shaft provides greater stability to the actuator, and permits high speed operation.

Abstract: Apparatus for screw transmission on a spindle comprising a nut having at least a first and second part with internal threads, at least one bore in the first and second parts, and at least one spring located within the at least one bore of the first and second parts and arranged with a bending load acting crosswise to a longitudinal direction of the bore. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: A linear actuator assembly, such as a rod or piston-type linear actuator, comprising a rotating lead screw with external threads; and a nut assembly with threads engageable with the external threads of the lead screw; and a guide tube having a hollow interior portion with at least one internal surface. The lead screw and nut assembly are located within the hollow interior portion of the lead screw, and the guide tube is configured to prevent the nut assembly from rotating with the lead screw. The nut assembly translates in a linear direction within the guide tube as the lead screw rotates. A portion of the nut assembly, such as a wedge, is radially biased against an internal surface of the guide tube. In one aspect, an axial compression spring is pre-loaded against the wedge and pushes the wedge up a ramp surface on the nut, and into the internal surface of the guide tube. The radially-biased wedge helps minimize torsional backlash in the assembly.