Abstract: The invention relates to a stroller system (2) convertible into a bicycle seat comprising a rigid foldable chassis (4), a set of steerable front wheels (14) pivotally mounted about a front axis (X-X), a set of rear wheels (20) pivotally mounted about a rear axis (Y-Y), a device for locking the front wheel set in its deployed and folded positions, a removable fixing device (6) on a bicycle luggage rack, and a mechanism for locking and unlocking the rear wheel set able to cooperate with a stop member secured to the rear wheel set between a locking position in which it maintains the rear wheel set in its deployed position and an unlocking position in which it allows the rear wheel set to pivot towards its folded position, the rear wheel set being maintained in its folded position by the front wheel set when the latter is locked in its folded position.

Abstract: The invention relates to a device for removable attachment of an accessory to a vehicle, comprising one plate intended to be rigidly connected to the vehicle and another plate to which the accessory is intended to be rigidly connected, one of the plates, referred to as the female plate (2), comprising two lateral centring guides (8), each provided with an inclined plane (10) so as to define, with the interlocking face of the plate, a female interlocking profile, and the other plate, referred to as the male plate (4), comprising two inclined planes (20) forming, with an interlocking face (4b) of the plate, a male interlocking profile capable of cooperating with the female interlocking profile of the female plate.