NL1028509C2 - Screen for greenhouse, has rear end movable between storage and working positions - Google Patents

Abstract

The rear end of the screen (3) can be moved between a storage position and a working position, the distance between these two positions being less than the distance between the storage and working positions for the front end of the screen. The screen can be moved along a guide. An independent claim is also included for a combination for two of these screens which can be moved in opposite directions and have adjacent front ends.

Description

Screen installation for cultivation areas with two or more carrier profiles.

Screen installation and method in which use is made of a second carrier profile, so that the installation can be opened and closed from both the end turn and the fixed departure point. The options for temperature and moisture exchange are thus increased.

Screening of a cultivation area is often necessary to prevent heat loss. In the event of large irradiation, protection will have to be provided to protect the cultivation. Screening will also take place to limit the emission of assimilation lighting.

It is the object of the invention to improve the problems that arise with regard to the removal of heat and moisture under a partially closed screen.

Screening usually takes place by means of screen installation with a cloth or foil from girder to girder, but other manners are also possible, such as for example from gutter to gutter. Closing the screen installation usually takes place with a carrier profile from a fixed starting point, the screen is pulled out from a so-called screen package with the aid of a carrier profile 15 (but also other ways of opening and closing are possible), the screen moves into the direction of the end stop. Upon opening, the screen will move back to the fixed starting point. The fixed starting point is usually located near or against a beam or purlin,

The present invention makes use of the methods of screens 20 which occur in practice, whereby the fixed point of departure can also be opened and closed with a second carrier profile.

In some cases it is desirable that in a situation where with 1 screen installation at a same starting point, to the left and right of, for example, the beam or purlin, a screen package is formed and the screen has largely closed and is located near the end stop and the opening at the location of that end stop the only possibility is to remove moisture or heat, the possibilities to remove heat and moisture are increased. with a second opening on the other side of the screen at the fixed departure point by means of a second carrier profile .

The advantage of this construction / method of operation is that better air exchange can take place above a largely closed awning.

In the case of an energy screen, the moisture exchange can be improved through a moisture gap. There will also be possibilities to open and close the screen faster.

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Situations may occur that it is desirable to use a second type of cloth / foil with other properties as a screen, in which situation the method remains substantially the same with the difference that a third carrier profile is required between screen material 1 and screen material 2 the heat and moisture regulation and the method of screening remains the same.

The aforementioned carrier profile can have any shape, the function is always to take along a cloth or foil, it is also possible to start from, for example, a wire or plastic strip. The foil or cloth can also move in other ways, for example by means of a roller tube.

In some cases it is possible to reverse the fixed departure point and the end stop so that the end turn functions as the departure point (screen package side).

10

The description of the drawings, FIG A, is the growing space 1 with the screen on a package 3, halfway between the fixed end point 4 and the end stop 5. The arrows indicate how the screen will open.

To the left and right of the screen package 3 are the carrier profiles 2 and 22, 22 being the rear of the screen or the fixed starting point. 6 refers to the girder that forms part of the greenhouse construction and where the screen package can be located. 8 is the column of the greenhouse and 7 is the gutter.

FIG. B shows the screen package 3 in the open position near the girder 6 with on both sides of the screen package the carrier profiles with carrier profile 2 located at the front 20 and carrier profile 22 located at the rear. 9 are the atlas wires which may be required to wear the cloth / foil.

FIG C, shows the screen in partially closed state. The carrier profile 22 is located at some distance from the beam (fixed starting point) and carrier profile 2 is located at some distance from the end stop (which can also be a beam), therefore air exchange is possible 11 in fully closed position carrier profile 22 will be against the girder and carrier profile 2 will be positioned against the stop.

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Claims (11)

4 CLAIMS 1. A screen device for a greenhouse comprising a screen guide and a screen movable along it, said screen comprising a front end and a rear end, said screen being movable between a storage position and an operative position, wherein the front end of said screen is displaceable accordingly, characterized in that the rear end of said screen is movable between a storage position and an operative position, wherein the distance between said storage position and operative position of said rear end is substantially smaller than that distance for that front end. 2. Screen device as claimed in claim 1, wherein said guide comprises the guide for that rear end. Screen device as claimed in any of the foregoing claims, wherein said end comprises a carrier profile, on which a drive for that screen engages. Screening device as claimed in any of the foregoing claims, wherein the storage position of that front end corresponds to the active position of that rear end. Screening device as claimed in any of the foregoing claims, wherein an aeration opening is limited between the storage position and the operative position of the rear end. Screen device as claimed in any of the foregoing claims, wherein said screen can be moved substantially horizontally. Screen device as claimed in any of the foregoing claims, wherein said screen comprises a cloth. Screen device as claimed in any of the foregoing claims, wherein said screen comprises a foil. 9. Screen device as claimed in any of the foregoing claims, comprising a further screen arranged at a distance from said screen, perpendicular to the direction of movement of that screen. An assembly comprising two shielding devices opposite each other in the direction of movement of said screens and displaceable in opposite direction according to one of the preceding claims, wherein the front ends of said screens can be placed against each other. 30 1028509