Coupling and tensioning device for snow chains

A coupling and tensioning device (100) for snow chains (9) comprises a main body (1) to which are connected first coupling means (3) designed to couple to an outer flange (90) of the snow chains, an anti-return block (5) slidably mounted in the main body (1) and able to receive second coupling means (7) designed to couple to a chain terminal portion (95) connected to an inner flange (91) of the snow chains, and manually operated lever means (3) mounted in the main body (1) to cause translation of the anti-return block (5). The user performs a first tensioning of the chains by pulling on the second coupling means (7) and a further tensioning by operating the lever means (3).