Plant husbandry – Cover – shade – or screen – Adjustable on supporting structure or having means allowing...
Patent
1997-11-21
1999-11-30
Poon, Peter M.
Plant husbandry
Cover, shade, or screen
Adjustable on supporting structure or having means allowing...
47 281, 47 31, 160 841R, A01G 1300
Patent
active
059920882
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a plant protection device in the form of a weather protection device that can be pulled over the cultivation consisting of a skeleton of longitudinal and transverse beams forming at least one rectangular area in which at least one waterproof foldable plant protection curtain can be drawn out from a folded up position and vice versa. The invention also concerns a foldable plant protection curtain.
BACKGROUND OF THE INVENTION
Until now greenhouses have traditionally been glass houses, that is, building frameworks of steel elements with glass mounted both on the sides and on the roof. The disadvantages of greenhouses of this type are that they are expensive to build, that it is too warm in them on sunny days, which requires temperature regulation measures, that their thermal insulation is very poor, which means that they require much heating in the winter, that they produce water condensation, that they do not lend themselves to large scale motorised working of the soil, etc. In recent years there are many cases where foldable greenhouse curtains have been mounted under saddle shaped greenhouse roofs. The greenhouse curtains can be used to regulate the amount of shadow and the temperature conditions and humidity to a certain extent.
Simple plant growing systems of the type described in U.S. Pat. No. 5,265,373 have been proposed which consist of pole constructions bound together on top by a framework which forms open horizontal or slightly sloping frame areas on which double foldable plant protection curtains are mounted so that the shadowing curtain can cover the whole frame area or leave it open. If frost protection is desired the shadowing curtain can be detached from the control cords and another curtain in the same frame area can be attached to them. If the shadowing curtain is perforated water cannot accumulate on it, but if the curtains are to serve as frost protection they must be waterproof. The problem is how to achieve water run off without formation of water pockets and how to support the weight of snow on a thin wire system. Solutions to these problems are not given in this document.
Through EP-A1-028 282 insulation for buildings in the form of halls, for example greenhouses, is known which consist of bubble films foldable in a zigzag pattern so that they can be used to insulate the inside of the glass roof or sides of the greenhouse as desired. The film is hung up via holders in wires and the opening width of the film folds can be regulated by changing the length of the spacers attached between the zigzag folds. Both in the bottom and in the upper part of the folds there are holes in the film for draining condensation water or for ventilating the multilayered film.
CA-A1-2,094,775 proposes a drainage system for retractable roofs in the form of membranes where wires have been drawn at even distances parallel to the roof ridges of the greenhouse to which the membranes lying on the roof trusses are attached with fasteners. This method of mounting the otherwise loose membranes means that they form a large number shell shaped depressions hung up at four points so that large amounts of water can accumulate, especially when the slope of the roof trusses is small.
THE GOAL OF THE INVENTION AND ITS MOST IMPORTANT CHARACTERISTIC FEATURES
The goal of the invention is to achieve a plant protection device and a waterproof foldable plant protection curtain which is essentially transparent to sunlight, can bind condensation water on its underside through capillary forces, can be stretched sufficiently so that water pockets are not formed and is so designed that snow loading is avoided. This has been achieved through the characteristic features given in the claims.
DESCRIPTION OF THE DRAWINGS
In the following the invention will be described in more detail in several exemplifications with reference to the drawings.
FIG. 1 shows a plant protection device in perspective with plant protection curtains according to the invention partly closed and partly open.
FIG. 2 shows schem
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Andersson Hans
Henningsson Goran
Ludvig Svensson International B.V.
Nelson Judith A.
Poon Peter M.
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