ARRANGEMENTS FOR COVERING WELLS PITS AND THE LIKE

摘要

1501295 Manhole frames PARCA-NORRAHAMMAR AB 17 March 1975 [19 March 1974] 10965/75 Heading E1G A cylindrical or square frame 5a for a manhole cover is telescopically and tiltably supported within a fixed frame 2 by inclined clamping screws 7 threaded in the wall of frame 5a and engaging surfaces in the fixed frame 2 which are perpendicular to the respective screw axis and inclined to the manhole axis. As shown the screws 7 engage respective vertical grooves 2c in the frame 2.