Patent ID: 6260304
Filing Date: 2001-07-17
Classification: B63B,E05B,E05C,Y10T

Abstract:
A door structure, comprising:a first plate serving as fixed frame with an opening enclosed by a peripheral edge; anda door connected pivotally to said first plate by at least one hinge construction such that with its peripheral zone the door can co-act sealingly with said peripheral edge;with said first plate carrying a number of peripherally arranged clamps, with clamps simultaneously rotatable by a collective operating mechanism with an operating handle and through rotation co-acting with the peripheral zones of corresponding non-round continuous holes in the door, which peripheral zones have for each clamp a contact surface inclining relative to the main plane of the door structure in the closed situation, which continuous holes have a form such that a clamp can pass therethrough;wherein the door includes a second plate which is strengthened with at least one beam welded to said second plate and extending between two clamps situated on either side of the door;the clamps are arranged symmetrically pairwise on rotation shafts;the continuous holes in the door are correspondingly formed slotted holes; andeach peripheral zone of a continuous hole in the door has two substantially symmetrically located, including clamp contact surfaces.