GB2043587A

GB2043587A - Lashing net

Info

Publication number: GB2043587A
Application number: GB8006588A
Authority: GB
Original assignee: RUD Kettenfabrik Rieger und Dietz GmbH and Co KG
Current assignee: RUD Kettenfabrik Rieger und Dietz GmbH and Co KG
Priority date: 1979-02-27
Filing date: 1980-02-27
Publication date: 1980-10-08
Also published as: GB2043587B; BE881941A; DE2907683A1; FR2450210A1

Abstract

The invention relates to a lashing net for holding loads, particularly during transport. The net consists of several net portions 1, 2 each made up of a number of chain strands 3, 4 joined together at nodes 5, the nodes at the edges of the net portions being attached to couplings 8 which serve for joining together the several net portions and for securing the lashing net to anchoring points, such as structural eyes. <IMAGE>

Description

SPECIFICATION Lashing net for holding loads The invention relates to a lashing net for holding loads, particularly during transport.

Lashing nets are known consisting of ropes or straps made of synthetic fibres. Nets of this kind are mostly used in the transport of merchandise by air.

But the known lashing nets are incompletely satisfactory for two reasons. In the first place, they stretch elastically and this gives rise to problems in tightening the net around the load. Secondly, the nets have fixed dimensions, making it necessary to stock several sizes.

The task tackled in the present invention is to provide a lashing net of the kind described above but whose size can be varied and which is easier to secure. The problem is solved, according to the invention, in that the lashing net consists of several net portions, each made up of a number of chain strands joined together at nodes, the nodes at the edges of the net portions being attached to couplings which serve for joining together the several net portions and for securing the lashing net to anchoring points, such as structural eyes.

The lashing net according to the invention has the advantage that a net of the size required for lashing together a given load can be assembled rapidly by joining together the appropriate number of individual net portions. Elastic stretch is very little. The net is easy to wrap around the load. The lashing net need not be pulled taut to take up elastic stretching.

A lashing net which is particularly easy to manufacture, and which is very strong, is obtained by making the nodes in the form of rings, each ring having a lesser thickness h which is a little less than the internal diameter b1 of the chain link, and a greater thickness w which is greater than the rod thickness d of the link of the chain strand. The rings constructed in this way are welded closed in an economical manner without it being necessary to provide intermediate devices to compensate for dimensional differences between the rings and the chain links. And the cross-section of the ring is suitable for taking high tensile stresses.

The invention will now be described in greater detail on the basis of the examples represented in the drawing, in which: Figure lisa plan view of an area of lashing net; Figure 2 shows a portion of a lashing net of different construction; Figure 3 shows a node at the edge of a net portion; Figure 4 is a sectional view of the node; Figure 5shows a node at a corner of a net portion; Figure 6 shows a node in the interior of a net portion; Figure 7 is a cross-section through a box-type node; Figure 8 is a section of the node taken in the plane VIII-VIII of Figure 7; Figure 9 is a section through one half of a cage-type node; Figure 10 shows a permanently locked catch-type node; and Figure 11 shows a re-openable catch-type node.

In Figure 1 an area of lashing net has been assembled by joining together several individual net portions 1, 2. Each net portion consists of a number of chain strands, such as 3 and 4, of different lengths, joined together by nodes 5 so as to form rectangles.

Along the edges of each net porton 1, 2 the nodes 5 are joined together by short chain strands 6 and couplings 8, the short chain strands 6 being enclosed in stiffening sleeves 7, preferably short lengths of rubber hose. The couplings 8 can, for example, by those described in the German Offenlegungsschrift 2533 838. Any desired number of net portions can be joined together, with the help of these couplings, to form a complete lashing net. If the lashing net is to be suspended from eyes 9, a good way to do this is by attaching two short chain strands 6 to each node 5, each strand having its own coupling 8, and joining the two couplings 8 together to form a loop which passes through the eye 9.

The net portion 10 shown in Figure 2 has, in the main, chain strands 11 of equal length. But the edge of the net portion 10 has extra chain strands 12 of different length, so that triangles are formed. Otherwise this kind of lashing net is essentially similar to that shown in Figure 1.

The remaining figures show details of several different kinds of node 5. In Figures 3 to 5 the node 5 is a ring, whose dimensions will now be described.

As shown best in Figure 4, the ring has a lesser thickness h, measured between its two faces, and a greaterthicknessw, measured radially. Each roundbar chain link 13 has a lesser internal diameter b1, measured between its straight arms, and a bar thickness d. The rings are constructed so that the lesser thickness h of the ring is a little less than the internal diameter b1 of the link, and so that the greater thickness w of the ring is greater than the bar thickness d of the chain link 13. In cross-section the arm of the ring is essentially rectangular but rounded at the inner surface of the ring to agree with the inner surface of the curved end of the link. The ring is manufactured of round-bar steel, leaving the end of the bar open, that is leaving a gap, shown at 14 in Figure 3, between them. The ring is then flattened.

The net portions are assembled together, to form the complete lashing net, by threading the open ring into the chain links, after which the gap 14 is closed by welding.

The short chain strands 6, equipped with their couplings 8, are joined to the node rings 5 in the manner described above. The stiffening sleeves 7, conveniently short lengths of rubber or plastic hose, help with the untangling of the chain strand when it is removed from its storage container, which is preferably a stackable box.

Instead of a ring, the node can take the form of a cage or box 15, as represented in Figures 7 and 8.

The box 15 has a lower part 16 and a cap 17. After insertion of the chain links the cap 17 is welded to the lower part 16. The sidewalls of the lower part 16 have an appropriate number of slots 19, set at suitable angles, for accommodating and securing the chain links 13.

Figure 9 shows a cage-like node 20 consisting of two parts 21 which are the same as each other. After inserting the chain links 13 the two parts are joined by a weld seam 22.

In the node of Figure 10 the two parts 24,25 of the node 23 are not welded together, but are joined by a catch 26 which, once closed, is not easily opened again. In the node 28 of Figure 11, on the other hand, a catch 27 is used which can easily be opened again.

The nodes shown in Figures 10 and 11 have the advantage that no welding is required. The two parts of the node are mated by forcing them together. It should be observed that, as shown in Figures 7 to 11, the chain strands need not terminate at the nodes, that is the chain can, if desired, continue right through the node. The nodes of the present invention can be used in other applications, such as snow chains for the tyres of motor vehicles.

Claims

1. A lashing netforholding loads, particularly during transport, characterised in that the lashing net consists of several net portions (1, 2; 10), each made up of a number of chain strands (3,4; 11,12) joined together at nodes (5, 15, 20, 23), the nodes at the edges of the net portions being attached to couplings (8) which serve for joining together the several net portions and for securing the lashing net to anchoring points, such as structural eyes (9).

2. A net as claimed in claim 1, characterised in that the couplings (8) are connected to the nodes (5, 15,20,23) by short chain strands (6).

3. A net as claimed in claim 2, characterised in that the short chain strands (6) are enclosed in stiffening sleeve (7).

4. A net as claimed in one of the claims 1 to 3, characterised in that at least some of the nodes (5) at the edges of the net portion (1) have two couplings (8).

5. A net as claimed in claims 2 or 3, characterised in that at least some of the couplings (8) are joined to their nodes (5) by two short chain strands joined together to form a loop.

6. A net as claimed in one of the claims 1 to 5, characterised in that the nodes (5) are rings, each ring having a lesser thickness h which is a little less than the internal diameter b, of the link, and a greater thickness w which is greater than the bar thickness d of the chain link (13) of the chain strand (11,12).

7. A net as claimed in claim 6, characterised in that the nodes (5) are round-bar rings squashed flat and manufactured open, with a gap between the bar ends, the gap being welded closed after threading the ring through the chain links.

8. A net as claimed in claims 6 or 7, characterised in that the arm of the ring has a substantially rectangular cross-section.

9. A net as claimed in one of the claims 1 to 5, characterised in that the nodes (15) are cage-like or box-like.

10. A net as claimed in claim 9, characterised in that the box-like nodes (15) have sidewalls (18) with slots (19) for accommodating and securing the chain links (13).

11. A net as claimed in claims 9 or 10, characterised in that the nodes (15) consist of two parts (16, 17) which are joined together after inserting the chain links (13).

12. A net as claimed in claim 11, characterised in that the two parts (16,17) are welded together.

13. A net as claimed in claim 11, characterised in that the two parts (24,25) are joined together by a catch (26, 27).

14. A net as claimed in claim 13, characterised in that the catch (27) is re-openable.

15. A net as claimed in one of the claims 1 to 14, characterised in that the chain links (15) are coated.

16. A net portion for lashing nets of the kind claimed in claims 1 to 15, characterised in that it is kept in stock in a stackable container.

17. A lashing net as hereinbefore described with reference to any one or more of the accompanying drawings.