A mechanism is for a foldable vehicle conveyor having an axis, inner and outer sections and a joint connecting the sections, the outer section being pivotable between a deployed position and a folded position at which the outer section is disposed above the inner section. In accordance with one embodiment the applicator is for intraligamentary injection and includes an elongated, thin member having an open distal free formed of a resilient and somewhat conformable material suitable for producing a substantially fluid-tight interface with the anatomic structures at the gingival sulcus to inject the anesthetic therein. It leverages on the conformity of legitimate flows, which obey the network protocols. The braking unit of each of the castor assemblies includes a bushing, a housing, a control shaft, and a braking member.