Abstract: The invention relates to a device for locking a cover (10) of a manhole top to the frame thereof, said device comprising at least one locking means (16?, 18?) which is provided on the cover (10) and comprises at least two interspaced, adjacent spring arms (18) that are respectively provided with an engaging section (18a?). Said sections (18a) can be engaged with a part (6) of the frame and held on the spring arms (18) in an elastic manner in such a way that they can be displaced in relation to the adjacent section of the periphery of the cover (10) at an angle smaller than a right angle. The invention is characterised in that a blocking device (40) is used to block the displacement of the engaging sections (18a) as required.

Abstract: The invention relates to a lid for a shaft cover, comprising a cover body (12) and at least one locking means (20) arranged on the body of the lid (12), said locking means comprising a spring section (21-24) and an engaging section (26) which can be placed into contact with one part (36) of the frame (30) and arranged thereon. The invention is characterised in that the spring section (21-24) is respectively secured by both ends thereof to the body of the lid (12), is separated from the body of the lid (12) and the engaging section (26) is arranged between the two ends of the spring section (21-24).

Abstract: The invention discloses a drainage device for surface drainage, in particular a drainage channel, comprising a, preferably elongate, basic element (12), a lid (22), preferably a cover grate, covering an opening (16) in the basic element (12), and comprising at least one locking engagement means (38, 40) for the locking engagement of the lid (22) to the basic element (12), the engagement means (38, 40) comprising at least one first element (42) for locking to the basic element (12) and at least one second locking element (44), which is integral with the lid (22) and may be brought into directly locking engagement with the first locking element (42). The unique feature of the invention is that at least one projection (34, 36), which protrudes in the direction of the base (18) of the basic element (12) and holds the second locking element (44), is substantially rigidly secured to the lid (22).