Patent ID: 8857231

Claim:
A steering lock antitheft device for a motor vehicle comprising: an antitheft body configured to receive a lock capable of rotating between a neutral position (STOP) and a start position (START), wherein the lock passes an intermediate position (OPERATE) when rotating between the neutral and start positions; a cam designed to be fixed in rotation to the lock to actuate the locking means of the antitheft device as a function of the position of the lock; non-return means to prevent said cam from rotating in the opposite direction toward the start position (START) once the cam has reached the intermediate position (OPERATE) when the cam passes from the start position (START) to the neutral position (STOP) without first passing via the neutral position (STOP), wherein a cam profile is formed in a radial wall of said cam; and a control finger and a resilient return means for said control finger counter to the action of said cam profile, said cam profile and said control finger cooperating, on the one hand, to form a non-return means and, on the other hand, to index the angular position of the cam, further comprising a support bearing the control finger in addition to a resilient return means for the control finger counter to the action of the cam profile, the assembly formed by the support, the control finger and the resilient return means forming a non-return and indexing module which is arranged such that said module is able to be manipulated before being associated with said antitheft device and the elements of the module remain assembled together during such a manipulation without having to act to keep said elements assembled together.