Patent ID: 7688201

Claim:
A removable cap for vehicles, of the type designed to occlude a filler of a fuel tank, the cap comprising: a first part, having gripping means; a second part, having first coupling means, designed to co-operate in a selective way with second coupling means provided at the filler; a locking device, switchable between a closing condition and an opening condition by means of a respective key, the device being operatively set between the first part and the second part and being arranged such that: in the closing condition, a rotation movement imparted manually upon the first part does not enable disengagement of the first coupling means from the second coupling means; in the opening condition, a rotation movement imparted manually upon the first part allows disengagement of the first coupling means from the second coupling means, at least in the closing condition, at least one component of the locking device is rotatable together with the first part, switching with the key of the locking device between the conditions of closing and opening causing an angular movement of said at least one component with respect to the first part, between a first pre-defined angular position and a second pre-defined angular position; wherein the removable cap further comprises a circuit arrangement including sensor means configured for detecting a relative angular movement between said at least one component of the locking device and the first part of the cap.