Abstract: A mounting apparatus for an anti-skid device for vehicles comprises an arm flexible essentially in one plane, fixed to the vehicle, and in its free end carrying a rotatable pulley which at its periphery has chain pieces attached thereto. The arm comprises a plurality of positioning elements fixed to a contracting member and enclosing at least one resilient tie member which, in a neutral position, gives the arm an arched shaped. When a pull line is activated the positioning elements form a rigid stack, whereby the pulley is moved down and pressed against one of the wheels of the vehicle.

Abstract: A mechanism for moving a slidable load carrier to and fro along a trailer includes a hydraulic double-acting servomotor having a piston rod which selectively engages with one or other of two sets of oppositely directed lugs, in the form of ratchet teeth, carried by a channel member fixed to the underside of the load carrier. The hydraulic servomotor is pivotally mounted on the trailer. The sets of ratchet teeth engaged are selected, for movement in either a forward direction or backward direction, by adjusting the angle of inclination of the hydraulic servomotor in a vertical plane. The hydraulic servomotor is controlled by a pneumatic servomotor coupled through a horizontally extending operating rod. The pneumatic control servomotor has a diaphragm disposed in a vertical plane in a casing which is provided at the bottom with a drain valve for removing water condensed within the interior.