Abstract: Device for absorbing kinetic energy of a moving body includes a plastically deformable helical spring having a stack of convolutions, the inner surfaces of which delimit a passage. At least a part of the convolutions can be pulled successively through the passage. Due to the resulting deformation of the convolutions, energy can be absorbed.

Abstract: An unrollable safety system has a box (15) accommodating a net (11) which contains a device with a rotatable shaft on which the net (11) can be rolled up and out. One or more supports (12, 25) can be positioned specific distances away from the box (15). Moreover, at least one longitudinal element (16), preferably a rope, that can be pulled out of the box (15) and can be held by the positioned supports (12, 25) is provided on which the net (11) is rolled out and held like a curtain by means of brackets (21). The net (11), as meshwork, is flexible, and so designed to be able to roll up, it being produced from a plurality of wires, ropes and/or cords bent in coil shapes. The wires (13), ropes and/or cords bend in coil shapes are preferably aligned perpendicularly to the direction of pulling out the net (11) so that the net can be rolled up on the shaft.

Abstract: A net (11) is particularly suitable for a basket for pisciculture, which may be placed in sea or fresh water (16). The net (11) is made of a wire material (1), producible from individual spiral or similarly bent longitudinal elements, wherein adjacent threads (2, 3, 4, 5) are woven together. Said net is simple and economical to produce.

Abstract: In a method for lining tunnel walls or ceilings with protective nets or the like, web-shaped protective net material (8) is unwound from a reel (7) and is fastened to the tunnel walls or ceiling by means of tie bolts. The reel (7) is rotatably arranged. The rotation of the reel (7) about a shaft (30) is controlled in order to unwind the protective net material (8), the shaft (30) being mechanically moved in steps along the tunnel walls or ceiling together with the reel (7). The protective net material (8) unwound in each step is preferably stretched and mechanically fastened. The individuals carrying out said processes are thus not exposed to any direct risk, while the lining process can be accelerated.

Abstract: With an apparatus for the shock absorption of rope structures, in particular for rockfall, land slide and snow barriers, at least one intermediate piece (1; 1?) deformable by tensile forces is provided which is accommodated within a rope subjected to tension. The intermediate piece (1, 1?) comprises one or more longitudinal elements (7, 8, 20) which can respectively be in the form of a strip, bar, wire, rope and/or strand. The longitudinal element or elements (7, 8, 20) are connected by their one end (7a, 8a; 20a) to the one rope end. On the other hand, they are guided about a deflection element (10; 10?) connected to the other rope end. Means are provided by means of which the deflection angle of the longitudinal element or elements formed upon loading the intermediate piece (1, 1?) is substantially sustained. The shock absorption characteristics can thus be better defined and optimised.

Abstract: The invention concerns an obstruction device for flowing waterways and rivulets of all kinds, in particular for torrents and similar river beds, with a flexible barrier element in the form of a catchment net (4), extending from one riverbank (2) to the other riverbank (3) transverse to the flow direction (7). The catchment net (4) is installed between a lower support rope (5) and an upper support rope (6). The support ropes (5, 6) are anchored in the riverbanks (2, 3) with rope anchors (8, 9) attached to their ends, whereby the rope anchors (9) of the upper support rope (6) are offset to the front relative to the rope anchors (8) of the lower support rope (5) in flow direction (7). In this way the catchment net (4) can deform itself when the barrier is filled in such a way that the water, rocks, flotsam etc. then overflowing the net will contact the same either not at all, or only briefly. In this way it is safely and permanently protected against the corrosion and abrasion effect of the overflowing water.