Patent ID: 6640498
Filing Date: 2003-11-04
Classification: B63B,E05B,E05C

Abstract:
A door structure, comprising:a first plate serving as a fixed frame with an opening enclosed by a peripheral edge; and a door connected pivotally to the first plate by at least one hinge construction such that the door can co-act sealingly with said peripheral edge, wherein the first plate carries a number of peripherally arranged clamps, which clamps are simultaneously rotatable by a collective operating mechanism comprising an operating handle said clamps, through rotation, can co-act with corresponding non-round continuous slotted holes in the door for locking the door structure in a closed position, and wherein each clamp includes a contact surface, wherein the contact surfaces are each inclined relative to a main plane of the door structure in the closed position, wherein each of said continuous holes has a form such that a corresponding one of said clamps can pass therethrough, wherein the door comprises a second plate which is received in a framework which co-acts sealingly with the peripheral edge when said door structure is in the closed position, wherein the clamps are arranged in pairs about said opening and each clamp includes a symmetrically rotation shaft, wherein a peripheral surface of each of said continuous holes in the door has two substantially symmetrically located, inclined clamp contact surfaces, and wherein the peripheral edge is deformable under an air pressure pulse acting on the door structure in the closed position such that at least the door can be pressed out of the main plane while maintaining the sealing co-action between the framework and the peripheral edge and while maintaining mechanical integrity of the door structure.