Hollow body for installation of electrical device i.e. lamp, has side wall comprising inner wall pointing in direction of cavity, where inner wall has conical-shaped region and cylindrical-shaped region

摘要

The hollow body has a cavity (12) formed by a rear wall (14), a mouth (16) and a side wall (18), where the side wall is formed between the rear wall and the mouth. The side wall has an inner wall (20) pointing in a direction of the cavity, where the inner wall has a conical-shaped region (24) and a cylindrical-shaped region (26). The side wall has a cylindrical-shaped outer wall (22) that is turned away from the cavity. A lid member (32) is fastenable at the side wall of the cavity.