Abstract: An actuator arrangement comprises a rotatable shaft, a nut mounted upon the shaft and translatable along the shaft upon rotation of the shaft relative to the nut, and a lock arrangement operable to lock the shaft and nut against relative rotation, the lock arrangement comprising a lock component mounted upon one of the shaft and the nut for axial movement relative thereto but held against angular movement relative thereto, the lock component being co-operable with an abutment provided on the other of the shaft and the nut, or a component associated therewith, to lock the shaft and nut to one another against relative rotation.

Abstract: An actuator arrangement comprises an actuator having a rotatable drive input, a motor, and a drive transmission arrangement for transmitting rotary drive from the motor to the rotatable drive input of the actuator, wherein the transmission arrangement includes a telescopic drive coupling.

Abstract: A disconnect assembly comprises an angularly movable input member 24 arranged to be driven for movement by an actuator, an angularly moveable output member 32, and a drive member 36 connected to one of the input member 24 and the output member 32 for angular movement therewith and having a formation 40 cooperable with the other of the input member 24 and the output member 32, wherein the drive member 36 is axially movable between a drive position in which the formation 40 cooperates with the said other of the input member 24 and the output member 32 to transmit torque between the input member 24 and the output member 32, and a disconnect position in which the formation 40 does not cooperate with the said other of the input member 24 and the output member 32.

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 clutch arrangement, especially adapted for use in an aircraft nose wheel landing gear steering arrangement, includes a rotatable drive input, a rotatable output, and an epicyclic gear arrangement, and a carrier upon which the planet gears are mounted, the drive input being connected to the ring gear of the gear arrangement or the carrier, the output being connected to the other of the ring gear or the carrier, and a clutch operable to control relative rotation between the ring gear and the sun gear and to direct the major portion of the torque being transmitted therethrough the first of two transmission paths.

Abstract: An actuator arrangement comprises a first screw shaft, a first nut cooperating with the first screw shaft such that rotation of the first screw shaft causes the first nut to translate thereon, a second screw shaft, a second nut cooperating with the second screw shaft such that rotation of the second screw shaft causes the second nut to translate thereon, and first and second linkages connecting the first and second nuts, respectively, to an output member, rotation of the first and second screw shafts to cause translation of the first and second nuts towards one another causing extending movement of the output member and rotation of the first and second screw shafts to cause translation of the first and second nuts away from one another causing retracting movement of the output member.

Abstract: An actuator is described which comprises a rotatable actuator member (14, 114) and a lock arrangement (28, 128) operable to lock the actuator member (14, 144) against rotation, the lock arrangement (28, 128) comprising an axially movable lock member (30, 130, 230a, 230b), the lock member being movable between a locked position in which it co-operates with a stop (34, 136) to resist rotation of the actuator member, and a released position, and an actuation device (62, 162) operable to move the lock member towards its released position.

Abstract: A lock arrangement comprises a first jaw component (28) pivotally moveable about a pivot axis (12), a second jaw component (30) releasably securable to the first jaw component (28) to form a pivotable jaw assembly (10), and an actuator arrangement operable to drive the jaw assembly from a locked position to a released position.

Abstract: An actuator arrangement comprises a plurality of linearly extendable actuators arranged to be driven by a common electrically driven motor, each actuator, being provided with limit stops to limit extension and/or retraction thereof, wherein the limit stops of the actuators are positioned such that a first one of the actuators has a smaller range of permitted extension than at least a second one of the actuators.

Abstract: An actuator comprises a screw shaft, a nut translatable along the screw shaft upon relative rotation occurring therebetween, and articulated connection means securing an output member to the nut, the output member being of elongate form and extending substantially parallel to or coaxial with the screw shaft when the actuator is in a retracted position.

Abstract: An actuator is described which comprises a rotatable actuator member (14, 114) and a lock arrangement (28, 128) operable to lock the actuator member (14, 144) against rotation, the lock arrangement (28, 128) comprising an axially movable lock member (30, 130, 230a, 230b), the lock member being movable between a locked position in which it co-operates with a stop (34, 136) to resist rotation of the actuator member, and a released position, and an actuation device (62, 162) operable to move the lock member towards its released position.

Abstract: A clutch arrangement comprises a rotatable drive input, a rotatable output, and an epicyclic gear arrangement comprising a ring gear, a series of planet gears meshing with the ring gear, a sun gear meshing with the planet gears, and a carrier upon which the planet gears are mounted, the drive input being connected to one of the ring gear and the carrier, the output being connected to the other of the ring gear and the carrier, and a clutch device operable to control relative rotation between the ring gear and the sun gear. The invention also relates to a nosewheel landing gear steering arrangement including such a clutch arrangement.

Abstract: An actuator arrangement comprises a first screw shaft, a first nut cooperating with the first screw shaft such that rotation of the first screw shaft causes the first nut to translate thereon, a second screw shaft, a second nut cooperating with the second screw shaft such that rotation of the second screw shaft causes the second nut to translate thereon, and first and second linkages connecting the first and second nuts, respectively, to an output member, rotation of the first and second screw shafts to cause translation of the first and second nuts towards one another causing extending movement of the output member and rotation of the first and second screw shafts to cause translation of the first and second nuts away from one another causing retracting movement of the output member.

Abstract: An actuator arrangement comprises a rotatable shaft, a nut mounted upon the shaft and translatable along the shaft upon rotation of the shaft relative to the nut, and a lock arrangement operable to lock the shaft and nut against relative rotation, the lock arrangement comprising a lock component mounted upon one of the shaft and the nut for axial movement relative thereto but held against angular movement relative thereto, the lock component being co-operable with an abutment provided on the other of the shaft and the nut, or a component associated therewith, to lock the shaft and nut to one another against relative rotation.

Abstract: An actuator arrangement comprises an actuator having a rotatable drive input, a motor, and a drive transmission arrangement for transmitting rotary drive from the motor to the rotatable drive input of the actuator, wherein the transmission arrangement includes a telescopic drive coupling.

Abstract: An actuator arrangement comprises a plurality of linearly extendable actuators arranged to be driven by a common electrically driven motor, each actuator, being provided with limit stops to limit extension and/or retraction thereof, wherein the limit stops of the actuators are positioned such that a first one of the actuators has a smaller range of permitted extension than at least a second one of the actuators.

Abstract: A tandem hydraulic valve comprising first and second axially aligned valve spools, a valve guide slidably receiving said valve spools to control, in use, the connection between respective ports of the valve guide, said first and second spools being formed as separate components and being axially interconnected, to move in unison, by an axial connection component, and, the interface of said first and second spools being connected to a predefined, external, hydraulic fluid leakage path.

Abstract: A thrust reverser actuator lock mechanism comprising a rotatable shaft, rotation of which in one direction from a rest position drives an associated thrust reverser from a stowed position towards an operative position in use, retractable abutment means having a rest position abutting an element rotatable with the shaft to prevent rotation of the shaft, resilient means urging said abutment means to said rest position, and, mechanical latch means sensitive to the speed of rotation of said shaft for latching said abutment means in a retracted position against the action of said resilient means when the rotational speed of said shaft exceeds a predetermined value.

Abstract: A no-back braking assembly for a rotary actuator includes a rotatable input shaft, a rotatable output shaft, wherein said output shaft is co-axial with said input shaft, and a braking arrangement operably coupled with said output shaft. The braking arrangement comprises first and second braking members and biasing means, and a torque transfer device mounted between said shafts for transferring torque applied to said input shaft to said output shaft. The first and second braking members are relatively moveable between a first position in which they are in mutual engagement and in which rotation of said output shaft is braked, and a second position in which they are mutually spaced and in which said output shaft is capable of relatively free rotation, the biasing arrangement being arranged to urge the braking members into their first position.

Abstract: A screw actuator arrangement comprises a rotatable input shaft which is arranged to be driven, in use, by a drive arrangement. The input shaft is coupled to a non-rotatably mounted output shaft, and has a screw thread formation including a helical groove within which a plurality of spherical members are received to provide a ball screw coupling between the input and output shafts. The actuator further comprises means for applying a braking load to the input shaft so as to limit loading of the drive arrangement in the event that an external overload is applied to the output shaft, in use.