Patent ID: 7040834

Claim:
A locking device of a flexible laminar element connected to a frame in order to achieve a bearing structure which houses a person's body, comprising: a groove obtained along at least one part of the perimeter of said frame and a shaped insert suitable for being pressed into said groove in order to constrain the perimetral edge of said flexible laminar element between said groove and said shaped insert; inside said groove a plurality of openings is arranged for the passage of as many appendixes of said shaped insert equipped with coupling means fit to snap said shaped insert to said frame, said shaped insert comprising: a first laminar body with a mainly longitudinal development and equipped with said appendixes and with a shaped head arranged as a cover for said groove at the opposite side of said appendixes, said shaped head defining a first shoulder on said first laminar body fit to receive a second laminar body, and a second laminar body with a mainly longitudinal development defining a second shoulder, opposed to said first shoulder, suitable for matching said frame inside of said groove, which said perimetral edge of said flexible laminar element is applied to, said first laminar body and said second laminar body being juxtaposed and mutually in contact in order to constrain said perimetral edge of said flexible laminar element to said frame when they are pressed into said groove, wherein said first shoulder has an opposing surface slanted upwards and converging towards said first laminar body, so as to prevent the separation of said second laminar body from said first laminar body.