A support structure for the return section of at least one conveyor, comprising including serpentine slat elements, support members for supporting said serpentine elements, and transverse members to which the support members are coupled, each slat element (1) being supported independently of the others by its own independent support members (2, 3); the support members (2, 3) comprise, on their lower edge, means (5, 5A) for their snap-coupling to the transverse members (6); the snap-coupling means being formed in such a manner as to enable the support members to be coupled by pressing them onto the transverse members downwards from above.