WO1980002822A1

WO1980002822A1 - A device for load lashing

Info

Publication number: WO1980002822A1
Application number: PCT/SE1980/000175
Authority: WO
Inventors: K Andersson
Original assignee: Nilson C; K Andersson
Priority date: 1979-06-21
Filing date: 1980-06-19
Publication date: 1980-12-24
Also published as: SE7905490L; SE421293B

Abstract

This invention relates to pneumatic load lashing. The known load lashing devices, for example ropes, are stretched by hauling-in one end, whereby the rope due to friction against the load can give rise to load displacements. The present invention has the object to render possible load lashing whereby the aforesaid disadvantages are avoided. This is achieved by a device, which consists of a hose (1), which is not ductile in its longitudinal direction and which by constrictions is divided into a series of chambers (3) communicating with each other.

Description

ADEVICE FOR LOAD LASHING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This invention relates to a device for lashing a load, comprising a hose substantially nonductile in its longitudinal direction.

For safety reasons, loads transported on open trucks must be secured by suitable means.

When the load consists of timber, insulation material bales etc., the safety means are simple lashing members in the form of chains, ropes, wires, saddle-girths and suitable tightening devices.

The greatest disadvantage of the known devices is a friction force arising between the lashing means and the load when the lashing means are tightened by "hauling in" their free end. Said friction force increases with the contact pressure of the lashing means against the load. As a consequence thereof, the lashing means is not stretched uniformly along its entire length, but its stretching is strongest in the end zone where the hauling-in takes place. The load, thus, is more forcefully compressed at the hauling-in end, which may result in both damages and in obliquity of the load.

A. further disadvantage also originating from the non-uniform tension in the load lashing, especially when the load consists, of mineral wool bales for building insulation, is that a rope used for lashing may cut like s saw into the load and damage »the same.

The present invention has the object to produce a device for load lashing by which the load is subjected to a uniformly distributed contact pressure along the entire lashing length. This object is achieved by a device, which comprises a hose, which is not ductile in longitudinal direction, and which is closed at its ends and provided with suitably spaced constrictions, whereby a plurality of communicating chambers are formed, and which hose includes means for the supply and removal of pressure medium. The Laid-Out Document SE 7407775-1, it is true, discloses the teaching of using a "one-cell." hose as a power means with limited stroke. It further is disclosed in FR-PS 951 941, that a plurality of such cells can be connected in series for establishing a greater stroke. Apparently it has not been obvious to utilize the effect of that the contraction in length is distributed uniformly along the entire hose length consisting of cells communicating through the constriction.

An embodiment of the invention is described in the following, with reference to the accompanying drawing, in which Fig. 1 shows the hose according to the invention in pressure- less state, Fig. 2 shows the hose according to the invention in pressurized state, and Fig. 3 shows the hose according to the invention applied to load lashing, the left-hand half of the load enclosed by a preεsureless hose, and the other load half enclosed by a pressurized hose.

The pressureless hose 1 shown in Fig. 1 preferably is reinforced and not ductile in its longitudinal direction. The hose 1 possibly may be coated with an outer layer of wear-resistant material.

At a constant c/c-distance along the hose 1, constrictions 2 are provided, the diameter of which slightly exceeds the diameter of the hose in pressureless state.

Upon pressurizing the hose 1, as shown in Fig. 2, a plurality of cells or chambers 3 communicating with each other are formed.

From Fig. 2 is apparent that upon pressurization of the hose 1 by connecting it to a pressure source, which may contain air or gas under pressure or a suitable hydraulic medium, the length of the hose 1 is shortened. This, of course, is due to the fact that the nonductile generatrix of the hose 1 which in pressure-less state is straight, describes a series of arcs when the hose is pressurized. Fig. 3 shows in a schematic manner, how the hose 1 according to the invention is used for lashing a load 4 on a truck platform 5.

In the left-hand half of Fig. 3 the hose 1 is shown in pressureless state, and in the right-hand half the hose is shown pressurized. Fig. 3 also shows how the load 4 is subjected to a uniformly distributed contact pressure (the load is "embraced") by the pressurized hose 1.

A load lashing of the aforesaid kind eliminates entirely the aforementioned sawing effect on the load, because no sliding motion takes place between the load 4 and the hose 1 when the latter is being pressurized.

The above description refers only to a basic embodiment and does not restrict the scope of the invention idea. At times an especially favourable effect can be obtained by a hose, in which the reinforcement pattern has been designed so as to yield maximum length contraction. The constrictions further may be brought about by external members, such as lash cords, hose clips or rings threaded onto the hose, without abandoning the idea of the invention.

The invention may also in other respects be varied freely within the scooe of the attached claims.

Claims

1. A device for load lashing, comprising a hose (1) substantially nonductile in its longitudinal direction, c h a r a c t e r i z e d i n that the hose is closed at its ends and provided with suitably spaced constrictions (2), whereby a plurality of chambers (3) communicating with each other are formed, that the hose (1) includes means for the supply and removal of pressure medium and means for securing the hose (1), for example on a truck platform, in the zone of its ends.

2. A device as defined in claim 1, c h a r a c t e r i z e d i n that the hose (1) is reinforced and has an outer layer of wear-resistant material.