The present invention relates to a method of positioning a protective sheet to cover a stack of goods, the stack of goods comprising the protective sheet in place, the protective sheet, and the support for delivering the sheet into position.
It is estimated that the demand for straw for use in biofuel power stations will be approximately 1 million tonnes per year by 2018. This has resulted in a market developing for providing large quantities of straw.
Straw is typically grown and then harvested and formed into bales. A number of such bales are typically stacked together to form large stacks for example with a height of 10 metres. Such stacks then remain in place until it is desirable or timely to transport the material to a power station for consumption.
As such, these stacks of straw may spend a considerable time outside exposed to the elements. In particular rain water can cause wastage and rot of the top layer of straw bales. Such wasted bales are typically disposed of at zero value to the grower.
It would be desirable therefore to cover the stack of straw with e protective sheet or similar.
However in view of the height of such stacks, it is not safe or even legal sue to health and safety legislation, to send a human being up to place a protective sheet onto such a stack.
Additionally, such stacks are often so large that they have a risk of bales coming loose or even being toppled by high winds, resulting in further loss of valuable product.
Therefore there exists a need for reducing the wastage that naturally occurs in such stacks.
In a first aspect, the invention relates to A method of positioning a protective sheet to cover a stack of goods having first and second opposing sides and a top surface,
In a second aspect, the invention relates to a stack of goods having first and second opposing sides and a top surface substantially covered by a protective sheet, the protective sheet comprising first and second opposing parallel sides, each side comprising an attached first and second rigid elongate member extending substantially the entire length of each respective parallel side of the sheet, each rigid elongate member having attached at least one securing strap, wherein the first and second rigid elongate members are located at or near the top of the first and second sides of the stack of goods, and the securing straps are secured to a location at or near the base of the first and second side of the stack of mods respectively.
The goods can be any perishable goods that are formed into a stack that could be expected to be exposed to the elements. Typically, the goods are bales of straw or hay but could be other perishable goods such as wood,
The present invention is particularly suitable to large stacks of goods. Thus, preferably the stack of goods is greater than 5 m, more preferably greater than 8 m tall.
In a third aspect, the invention relates to a protective sheet for covering a stack of goods the protective sheet comprising first and second opposing parallel sides, each side comprising an attached first and second rigid elongate member extending substantially the entire length of each respective parallel side of the sheet, each rigid elongate member having attached at least one securing strap.
The rigid elongate members may take a variety of forms, however a convenient form is a metal tube.
The present invention is particularly suitable for large sheets, and thus preferably the sheet covers an area greater than 100 m2.
Each opposing side should have sufficient securing traps according to the prevailing needs, However it has been found that from two to eight securing straps is generally sufficient.
In a fourth aspect, the invention relates to a support for a lifting device for lifting a protective sheet as described herein, the support comprising
The support preferably comprises two positioning strap projectors, as this provides a means to evenly pull the sheet over the top surface of the stack. however there could be more than two.
The positioning strap projectors are preferably operable by catapulting a coil of positioning strap.
Thus, the present invention provides a method for positioning a protective sheet to cover a s stack of goods, which can be applied to even very high stacks, without the need for sending a human being up onto the stack.
Furthermore, the invention provides a means of securing the protective sheet to the stack at high levels of tension and thus mechanically strengthening such a stack to prevent it from being damaged or destroyed by high winds.
The invention will now be illustrated by reference to the accompanying figures, in which:
Turning to the figures,
The telehandler 12 comprises a boom extension, which is a 10 mm thick right angle plate locked in by securing clips.
In use, the control box 28 actuates the holder 24 to rotate rapidly in a counter-clockwise direction from the perspective of
As the positioning straps 25 need to extend along one side of the stack 40 and a portion of the top surface, they are generally longer than the securing straps 26 that only need to extend down one side of the stack.
In a further refinement, the sides of the sheet 30 are also folded in to create sheaths 31 down the sides. Into these sheaths 31 are inserted side straps 33 which extend along the sides and are looped around the pole 22. Importantly, the straps 33 are a distance, e.g. 20 mm from the end of sheath 32. This has the effect that when pole 22 is pulled by securing straps 26 the side straps 31 are pulled in tight before the rest of sheet 30. This allows the sides of the sheet to bite into the stack and provide a tight fit on the sides of the sheet 30.
Also shown is the lifter 12 having mounted thereon the support 10 as discussed in relation to s
As such the two positioning straps 25 are wound into a coil and placed into securing strap projectors 14, 16. Their outer end is secured to the pole 22 at one of the cutouts 34.
The lifter 12 then lifts the support 10 which lifts the rigid elongate pole 22 which in turn lifts the sheet 30 upwards adjacent to the first side of the stack of goods 40, as can be seen in
The lifter then continues to raise the support 10 and pole 22 so that the pole is located approximately centrally above the top surface of the stack of goods as shown in
Once in position, the strap projectors 14, 16 project the coils of positioning strap over the top surface of the stack 40 and down the opposite side of the stacks as can be seen in
The ends of the positioning straps are then secured, in this case to a second telehandler 42, Second telehandler then tensions the positioning straps 25 so that pole 22 is pulled out of the retaining feature of the bent metal rods 20. This has the effect of the pole 22 falling onto the top surface of the stack of goods, as can be seen in
The telehandler 42 continues to tension the positioning straps 25 until the protective sheet is in place over the top of the stack 40, as seen in
To finalise the positioning of the sheet, metal rods (not shown) are inserted into the body of bales at the base of the stack. The positioning straps 25 are removed from the pole 22 and the ends of the securing straps 26 are attached to the metal rods. A ratchet device can be added to the ends of the securing straps 26 at this point so that more tension can be applied to the securing straps 26. The end result is a protected stack as shown in
As the securing straps are attached to the rods 22 and not directly to the sheet material, there is no danger of tearing of the sheet, even if high levels of tension are applied to the securing straps. This has the effect that a very tight and compact structure can be produced which provides stability to the stack as shown in
In an alternative embodiment, instead of having five securing straps and two positioning s straps, it would be possible to have five securing straps, a number of which also act as positioning straps. Clearly the positioning straps need to be longer than securing straps, so this arrangement would result in the straps that acted as both securing and positioning straps being a little longer than necessary in the final finished covered stack.
Number | Date | Country | Kind |
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1609985.5 | Jun 2016 | GB | national |
Filing Document | Filing Date | Country | Kind |
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PCT/GB2017/051566 | 6/1/2017 | WO | 00 |