Trap door for e.g. sight hole of conduit, has hinge with respective constitutive parts fixed to panels and frame, where constitutive parts are placed below panels and one of parts have fixed plate placed to create space between it and frame

摘要

The door has panels (200) articulated relative to a frame (100) by a pivot connection i.e. a hinge. The hinge has constitutive parts fixed to the panels and constitutive parts (120) fixed to the frame and associated by shafts (300). All the constitutive parts are located totality below the panels. The parts (120) have a fixed plate (121) disposed relative to the frame to arrange a space between it and the lower edge of the frame.