The invention relates to a lock for a fuel tank cap or tailboard in a vehicle, comprising a locking bolt (1) which can be adjusted between an open and a closed position by opening and closing the cap or tailboard. Said fuel tank cap lock, in the housing (2) of the lock, is positively driven counter to the force of a compression spring (4) in the direction of its longitudinal axis (6) and about its longitudinal axis (6).

The invention regards a locking device for the closing door of a washing and drying machine, constituted of a body of containment that houses a locking wheel for the door latch, subject to the action of elastic means, a sliding bolt capable of preventing the rotation of said wheel and a time-delay mechanism fitted with a locking pawl for said sliding bolt. The wheel is fitted with a cavity that presents a surface tilted with respect to the plane of rotation, so as to resolve the force it exerts on the bolt, when a pulling is exerted on the door while the device is in a closed and locked position.