Abstract: A disc holder and scraper construction for disc harrows comprises a disc element fixed to a rotary hub, which is supported by a disc holder spring in turn fixed to a framework of a disc harrow, the disc holder construction further comprising a scraper assembly for removing soil adhering to a disc element, the scraper assembly being affixed to a flexible disc scraper arm, which is in turn affixed to the disc holder spring; the disc scraper arm, affixed to the disc holder spring and not to the harrow framework, supports the scraper assembly and is driven in a timed manner with respect to the disc element.

Abstract: A suspension for a vehicle wheel includes at least one helicoidal spring and at least one flexible retaining and connecting armoring, which in working position, stresses a portion of the spring by maintaining it compressed to obtain two different stiffness curves.

Abstract: A suspension for a vehicle wheel, comprising an elongated shock absorber (7) having an elongated body (6) and first and second abutments at opposite ends of the shock absorber. First and second coil compression springs (R20, R30) are aligned with each other and surround the shock absorber (7). One of these springs bears against one of the abutments and the other of the springs bears against the other of the abutments. A cup (32) is disposed between the springs, this cup surrounding the body and being movable lengthwise of the body. Both of the springs bear on the cup (32). An annular jack (5) is fixed to and surrounds the body and comprises one (10) of the abutments. A third abutment (31) is fixed to the body a distance from the jack (5). An elastic ring (54) is compressible between the cup (32) and the third abutment (31).

Abstract: The invention has for its object a suspension with dynamically variable flexibility or stiffness. The suspension process uses one or several elastic elements mounted opposite each other, so as to impress on the vehicle suspension a variation of stiffness or of flexibility having two slopes on the curve (shock-relaxation and compression effort) and the use of different stiffnesses or flexibilities is localized during operation of the suspension in the vicinity of the position of the loaded vehicle on its wheels and that the least stiffness is located on the second portion of the course of collapse of the wheel suspension. The invention is applicable to suspensions particularly for automotive vehicles.

Abstract: A suspension for the wheels of a motor vehicle, the suspension having an operating load position in which the suspension is deformed by a force equal to the weight of the vehicle, a suspended wheel position in which the suspension is deformed by a force less than the weight of the vehicle and a collapsed position in which the suspension is deformed by a force greater than the weight of the vehicle. The suspension has a stiffness that is greater between the operating load position and the suspended wheels position than between the operating load position and the collapsed position. A gradual transition is provided between these stiffnesses.

Abstract: In a footwear side-lasting machine, the setting movement of pressure members is automated which are operative to upturn and press onto a margin of a footwear blank insole coated with an adhesive a flap of its respective upper, while monitoring the curvature of the footwear blank insole and driving, based on such monitoring, motive members for the setting movement of the pressure members.

Abstract: A toy aircraft flight simulator which may also be used to simulate combat flight situations. The device simulates directional and velocity changes of aircraft flight, aircraft firing at targets on the ground, anti-aircraft ground fire, and a complete "shooting down" of the aircraft.The flight simulator includes a display screen and a rotating drum which may be displaced axially having a translucent screen on its periphery. A light source movably mounted within the drum operates to project an aerial landscape image onto the display screen. A unitary control operates both the axial displacement of the drum and the movement of the light source.