The invention concerns an elastic hinge for specticles frame comprising two fixed and mobile hinge elements, articulated about an axis of rotation by a pivoting head of one of the elements inserted in a pivoting head of the other element and by a link housed in succession in an inner passage of the two elements emerging into the pivoting heads. The present invention also provides a battery module system in which the male and female connectors are attached to a top surface of each battery module. In one embodiment, the cooling head also serves as a compression head when forced into the dross by a cooperating dross press assembly. Customer commitment to the second solution is obtained. In an embodiment, the download controller is configured to check if a file to be downloaded can be handled by the mobile device and to transmit a download request to a further device if the mobile device cannot handle the file. The structure makes it possible to produce fireguards, pens or beds.