Abstract: An automatic connection system provides for the transfer of energy, gas or liquid fuel between two units of which at least one can be mobile. The system has one transfer part or cable which is at least partially elastic and at least partially rigid and a receiver device that is funnel-shaped with successively tapering or successively tapering successively turned cross-sections. An input device on the transfer part or cable operates as a codeable, secure, self-connecting connection device. An output device is affixed to the receiver device. The system can utilize a cable winder or another suitable extension and retraction mechanism for extension and retraction of the cable.