Patent ID: 8657099

Claim:
A conveyor device for products of the preform type, of the type forming a kind of tunnel wherein is guided and imprisoned the end of said preforms, on the neck side, said tunnel is comprised of several rails supported by a frame and formed to shape a twist which extends from an entrance to an exit of said tunnel, said several rails comprising: a rod which cooperates with the end of the preforms, on the neck side, in order to retain the preforms, said rod extending along a twisted path; a first rail and a second rail which provide a guidance under the neck of said preforms: said first rail is a straight rail and said second rail is a curved rail, said curved rail is formed with a profile configured to establish constant separation between said first rail and said second rail from said entrance and said exit of the twist; wherein the curved rail corresponds to an edge of a first flat planar structure, the edge of the first flat planar structure formed with a curvature so as to form the constant separation with the straight rail between the entrance and the exit of said tunnel; wherein the curved rail is positioned vertically between the entrance and the exit of the twist, an upstream portion of the curved rail is located in alignment with an upstream portion of the straight rail and a downstream portion of the curved rail is located at a same level as a downstream portion of said straight rail.