Abstract: A device and control method for actuating valves of a motor vehicle internal combustion engine including at least a controlled hydraulic actuator actuating the associated valve that is provided in the form of a cylinder. A mobile piston connected to the valve delimits two opposite hydraulic pressure chambers each supplied with an incompressible fluid and pressure regulated by a control unit such that the pressure prevailing in one of the chambers is alternately higher/lower than that which prevails in the other chamber to actuate the valve. Each pressure chamber of the cylinder is capable of communicating with a corresponding actuating hydraulic pressure source, which includes a pneumatic return mechanism for the fluid.

Abstract: The invention concerns a device (10) for actuating valves (12) of a motor vehicle internal combustion engine comprising at least a controlled hydraulic actuator actuating the associated valve (12) which is provided in the form of a cylinder wherein a mobile piston (24) connected to the valve delimits two opposite hydraulic pressure chambers each supplied with an incompressible fluid (FHI) and pressure regulated by a control unit such that the pressure prevailing in one of the chambers (28, 30) is alternately higher/lower than that which prevails in the other chamber to actuate the valve (12). The invention is characterised in that each pressure chamber (28, 30) of the cylinder (20) is capable of communicating with a corresponding actuating hydraulic pressure source (32, 34), which comprises pneumatic return means for the fluid. The invention also concerns a method for controlling said device (10).

Abstract: The disclosure herein describes an anti-kickback device for use in a wood ocessing machine. The invention is concerned with mounting, upstream of an arrangement of circular saws, a series of fingers pivotably mounted on a shaft mounted transversely of the frame. Each finger is characterized by a curved edge, facing the lumber passing by, on which is mounted a series of peripherally spaced lumber-engaging pointed elements, each element defining a different angle with respect to the pivot axis of its shaft. Each lumber-engaging element consists of a support which is removably mounted to the curved edge and a blade, preferably made of carbide material, fixed to this support.

Abstract: A threading belt (A) extends around a plurality of pulleys and guide rollers (B). A loading station (C) is disposed along a linear run of the threading belt for inserting a web between hingedly connected gripping portions (16, 18) of the threading belt. The loading station includes a wedge-shaped belt spreading member (52) for urging the gripping portions of the belt apart and providing a groove (60) through which the web is fed between the gripping portions. The threading belt conveys the web through a floating dryer (D) to an unloading station (E). The unloading station includes an ejector member (90) which spreads the belt and a nozzle (96) for directing a jet of air between the belt gripping portions to eject the web therefrom. The belt includes a main woven fabric strength member (24) extending along the hinged connection of the gripping portions. A fabric cover (20) surrounds the gripping and hinge portions and is impregnated with a silicon rubber (22).