A folding wing tip system of an aircraft includes a latch pin actuator having a primary mechanical lock and a secondary hydraulic lock. The mechanical lock may include a lock cam movable between a lock position, in which the lock cam engages the latch pin, and an unlock position, in which the lock cam is disengaged from the latch pin, and a first lock actuator mechanically coupled to the lock cam and configured to provide a bias force pushing the lock cam toward the lock position. The hydraulic lock may be disposed in an unlatching hydraulic line and has an initial state, in which fluid flow through the unlatching hydraulic line is blocked thereby to hold the latch pin in the latched position, and an open state, in which fluid flow through the unlatching hydraulic line is permitted thereby to permit retraction of the latch pin to the unlatched position.

One example of an actuation system includes a pneumatic muscle connected to a component to be actuated. The system also includes an actuation member connected in series to the pneumatic muscle and valve connected to the pneumatic muscle to control a pressure in the pneumatic muscle. The system also includes a positioning mechanism connected to the component to control a movement of the component and a controller connected to the pneumatic muscle, the valve, and the positioning mechanism, the controller to control actuation of the component by controlling the pressure in the pneumatic muscle.

Valve assemblies are provided in a track tensioning system or in other applications. The valve assemblies allow pressurized fluid (grease or hydraulic fluid from a power machine) to be introduced or evacuated from the same port. The valve assemblies use either a single check ball or poppet configuration, or a dual check ball or poppet configuration which are moveable from a first configuration, in which fluid is blocked in one direction while allowing flow in the other direction, to a second configuration where the reverse is true. A track tensioning element includes piston retaining features which retain a piston within a track tensioning cylinder tube. A track tensioning element can also include a no-pre-load spring positioned in-line with the tensioning cylinder. Disclosed track tensioning systems and track tensioning elements can, in various embodiments, utilize any combination of all or some of the disclosed features.

The present disclosure concerns a nacelle for an aircraft turbojet engine that includes a thrust reverser having a cowl displaceable between a deployed position and a stowed position, a fixed structure, and a secondary nozzle. The nozzle includes panels movable in rotation, and hydraulic actuators for sequenced actuation of the cowl and panels. The actuators include a body mounted on the fixed structure, and a rod mounted in the body and is linked to the cowl and panels via a device for transmitting movement of the actuator to the panel. An actuation system having a hydraulic control device controls the displacement of the rod of the actuator. The actuator further includes a device for alternately displacing the rod in translation relative to the body to cause translation of the cowl, or in rotation relative to the body to cause rotation of the nozzle panel.

In order to secure a reached extension position of a piston rod (22, 22) of an in particular multi stage operating cylinder device (100) with at least one operating cylinder unit (50) not only through the operating pressure in the cylinder (1, 1) of the operating cylinder unit (50) but additionally mechanically, a mechanical safety through interlocking safety elements (4a, b) in the interior of the operating cylinder device (100) is provided which is activated exclusively by the operating pressure in the first pressure cavity and disengaged by a pressure in a second operating cavity.

A folding wing tip system of an aircraft includes a latch pin actuator having a primary mechanical lock and a secondary hydraulic lock. The mechanical lock may include a lock cam movable between a lock position, in which the lock cam engages the latch pin, and an unlock position, in which the lock cam is disengaged from the latch pin, and a first lock actuator mechanically coupled to the lock cam and configured to provide a bias force pushing the lock cam toward the lock position. The hydraulic lock may be disposed in an unlatching hydraulic line and has an initial state, in which fluid flow through the unlatching hydraulic line is blocked thereby to hold the latch pin in the latched position, and an open state, in which fluid flow through the unlatching hydraulic line is permitted thereby to permit retraction of the latch pin to the unlatched position.

Disclosed here is a system and method to control multiple eversion-based actuators using a single motor, or no motor, thereby reducing the size and cost of the multiple eversion-based actuators. An activation mechanism can include a motor rotating in an expansion direction, rotating shaft, clutch, brake, pressure source under high pressure, and/or valve. The activation mechanism can cause the actuators including a wound reel of material to unwind and lengthen. A retraction mechanism can include a motor rotating in a contraction direction opposite the expansion direction, rotating shaft, clutch, pressure source having low pressure, valve associated with the pressure source, and/or the passive retraction system. The retraction mechanism can cause the actuators to rewind and shorten.

A hydraulic method for opening and closing a ram and operating a wedge lock and unlock mechanism using only an open port and a close port. To close the rams and lock the rams in a closed position, hydraulic fluid is directed to the close port where the rams close and then are locked in the closed position. To open the rams, hydraulic fluid is direct to the open port whereupon the wedge locks are unlocked. Afterward the wedge locks are unlocked, hydraulic fluid is utilized to open the rams.

Valves having a sprung gate of various constructions are disclosed. In one embodiment, the sprung gate includes a first endless elastic band having an inner perimeter defining an open space sandwiched between a first gate member and a second gate member that each define an opening therethrough in an open position portion thereof. The first endless elastic band is sandwiched therebetween with its open space oriented for alignment with the opening in both of the first and second gate members, which are aligned with one another to form a passage through the sprung gate. In one aspect, the first endless elastic band in positioned inward a distance from the outer sides of the first and second gate members and spaces the first gate member a distance apart from the second gate member thereby defining a channel having a bottom defined by the first endless elastic band.

The disclosed device provides improved hydraulic railroad switch points and presents a solution for avoiding the switch points from moving due to the spring force generated during manual installation or maintenance. The present device further provides a reliable point detection and indication mechanism. The device includes a trailable switching unit that enables a train to run through the trailable switching unit. A throw unit automatically adjusts plurality of rail and throw distances. The hydraulic cylinder provides constant forward and reverse movements, each movement in time defining an operation period. The hydraulic circuit unit increases the operation period. The center stroke unit blocks the hydraulic cylinder movement at the middle stroke during installation and maintenance. The mechanical target automatically indicates the position of a point rod. The spring unit produces the continuous thrust force that keeps the railroad switch points closed in forward and reverse positions. The proximity sensors detect the point rod position and adjust the point rod.