Abstract: An anti-theft device for vehicles includes a central block rotationally fixed to a steering wheel and having a central cavity therein. A lock member is rotatably supported in said cavity and carries at a free end thereof a frontal lift cam. An inner cam is rotatably supported in the central block cavity and is rotationally fixed to a steering rod. A pair of diametrically opposed grooves is formed in the inner cam. A movable crossmember is disposed in the central block cavity between the frontal lift cam and the inner cam, and is carried with the central block for rotation. The frontal lift cam, when rotated, engages against and presses the crossmember into the grooves of the inner cam, thereby locking the inner cam to the central block for rotation therewith. A spring biases the crossmember outwardly from the inner cam grooves.

Abstract: Modifications in the steering wheel locking and unlocking means in cars and trucks include a cylindrical body (3) which houses the steering shaft (1) with the possibility of axial displacement, and is fitted with upper and lower flanges (4) and (5) respectively, forming a spool, between which there is an eccentric cam (9) solidly joined to the shaft of the ignition and starter key switch, with the upper flange (4) having some ascending rods (11) in two diametrically opposed points, which cross a block (12) solidly joined to the steering wheel (10), and which are fitted to a locking spider (14) which engages with an internal block (20) solidly joined to the steering shaft (1) so as to be housed within some radial notches (24) of the internal block, for solidly joining the steering wheel to the steering shaft and, the spider (14) being engagable, through elevation, within some other radial notches (26) made in an upper plug (28) screwed to the external block (12).