Box for use in hole of plaster or masonry dry wall to accommodate electric apparatus, has stop faces and stop defining longitudinal grooves formed in edges to guide sliding of tab in work position during screwing/unscrewing of screw

摘要

The box (1) has a retaining tab (37) mounted on a vertical adjusting screw (36) by a threaded or self threading hub (54). The tab is in a form of circular segment attached to the hub by defining stop faces (77, 88). The hub has lower and upper stops (79, 80) along a circumference parallel to the faces so that the faces and the stops define longitudinal grooves. The grooves are formed in longitudinal edges (73, 74) placed along a surface of a cylindrical skirt (32) for guiding longitudinal sliding of the tab in a work position by projecting on the box during screwing or unscrewing of the screw.