Abstract: A device for opening and closing a rotary valve by remote control comprising a cylinder having a main bore in which a movable unit is slidably mounted in fluid tight manner and which can be displaced in opposite directions by a pressurized fluid supplied by either of two pressurized fluid sources which can be remotely actuated in independent fashion. A sequencing mechanism is mounted in the cylinder for simultaneously applying the pressurized fluid from an activated source to a corresponding end face of the movable unit while connecting the other end face with the atmosphere. The movement of the slidable unit is transmitted to the rotary valve through a rack and pinion arrangement and a linkage composed of cranks and a connecting rod so arranged that when the valve is in either of its end positions it cannot produce movement of the linkage due to alignment of the axis of rotation of the pinion and the connection points of the rod to the cranks.

Abstract: A ski device adapted to be mounted on a landing gear provided with front and rear sheets each of which carry a wheel with the wheels being positioned in tandem. The device includes a monobloc ski assembly having an aperture therethrough through which the wheels move to raise and lower the skis off the ground and provide for ease of manoeuverability on a runway and a snow covered terrain.

Abstract: An actuating and bracing jack comprising a cylinder and a rod which are pivotably connected at their free ends to a fixed member and to a moveable member respectively. The cylinder has at least at one of its extremities, an internal resilient catch member, and the rod carries a projection capable of coming into engagement behind the catch member. The cylinder has an enlarged cylindrical chamber housing a displaceable locking device capable of being driven by the rod upon retraction movement thereof, to a first position to which the catch member is firmly applied against the projection. The locking device is displaceable in the opposite direction in the cylinder under the action of an actuating fluid to a second position to which the catch member is freed. The rod is provided with a device for taking up play between the rod and cylinder, such device including a displaceable draw member which acts upon a member urging a slotted portion of the rod outwardly into close proximity to the cylinder.

Abstract: Apparatus for eliminating cavitation in a main pump in which the rotor of a supercharging pump is connected to the rotor of the main pump such that the latter rotor drives the rotor of the supercharging pump. Permanent communication is established between the delivery side of the supercharging pump and the induction inlet of the main pump. A hydraulic fluid reservoir is connected to the inlet of the supercharging pump and it is also connected to the delivery side of the supercharging pump through the intermediary of a valve which controls the flow of hydraulic fluid to the reservoir from the delivery side of the supercharging such that when the pressure at the induction inlet of the main pump exceeds a predetermined value flow is established to the reservoir in order to avoid the appearance of cavitation in the main pump. Leakage flow within the main pump is also recycled to the reservoir continuously through the valve.

Abstract: A distributing unit for a dual-action hydraulic electro-distributor of the type comprising, firstly, a distribution stage provided with a bore in which a slide is mounted so as to slide between two end positions with a spring return to a central or neutral position and, secondly, a piloting stage with valves controlled selectively by solenoids, each of the valves being adapted, when actuated, to communicate the feed pressure to the corresponding end of the slide and, when not actuated, to set the corresponding end chamber of the bore to return to the tank, wherein untimely displacement of the slide, e.g.