| 摘要 |
PURPOSE: An access door is provided to enable convenient use and reliably maintain air-tightness. CONSTITUTION: An access door comprises a body, a cover assembly(110), a hinge assembly(150), and a gasket. The body comprises a hollow and a plurality of rings. The rings are arranged along the outer part of the hollow and are rotatably fixed. The cover assembly opens/closes the hollow of the body and comprises a plurality of protrusions. The protrusions correspond to the rings. The hinge assembly connects the body to the cover assembly and comprises a plurality of hinge units. The gasket is arranged along the outer part of the body between an inner cover and the body. |
