The present invention consists of a concealment device for vehicle roofs with a transparent element comprising a group of technical solutions in the blocking means which enable unblocking and smooth opening and closing movements without losing efficiency in respect of retention. It is characterized by the use in the rail of an elastomeric body with a distortion capacity such that when the braking brake shoe attempts to advance a front of elastomeric material forms in front and a traction zone forms behind, checking the advance. The device also incorporates blocking means which make use of an appropriately configured lever which multiplies the release force of the retention brake shoes applied by means of a wire or similar, by power obtained from the handle device.