A combination of a fixed frame and a movable shutter pivotally mounted therein

摘要

A lid or shutter 7 is hinged to a fixed frame 1, e.g. in an outlet box for underfloor electrical facilities, by hinge arrangements each including a longitudinally extending slot 12 in the frame 1 and a shaped cam member 9 integral with the lid 7 and engaging in the slot in the frame. A curved cam face 10 of each cam member 9 engages one end 17 of the associated slot 12 such that the pivotal axis 18 of the lid 7 is permitted to move between a first position at a minimum spacing from the rear wall 5 of the frame 1 when the lid is closed and a second position at a maximum spacing from the rear wall when the lid is open. Such movement of the pivotal axis reduces the risk that the lid 7 will foul the frame as the lid moves from the closed to the open position.