FR2788659A1 - Ventilator for plant growing frames has roller for reeling in plastics covering with mesh to reinforce it - Google Patents

Abstract

The ventilator for plant growing frames has a reeling roller (5) for the plastics covering film (2) and a mesh (4) covering the film which prevents entry of insects. The mesh partially filters the suns rays when the plastics film is retracted and reinforces the film when extended.

Description

Ventilation system for greenhouses with net and gutter formation.

  The present invention relates to a ventilation system for greenhouses formed in

  from a metal structure covered with plastic film.

  The present invention also relates to a gutter system for

  the evacuation of water between two twin greenhouses.

  In order to regulate the temperature inside the greenhouses, it is necessary, if the temperature exceeds a certain threshold, to let the heat dissipate through openings generally located on the upper part of the greenhouse. Indeed, an I) excessive temperature (generally higher than 30 C) tends to facilitate the

  development of certain diseases.

  Known ventilation systems generally consist of a hinged hatch allowing the heat to escape. These systems have the disadvantage of allowing insect pests to affect crops. In addition, some of these known systems, by making a direct opening to the greenhouse, leave the crops in direct contact with the light rays which burn the plants. Finally, in general, the plastic films which cover greenhouses are relatively fragile and are easily deteriorated by storms or

by hail for example.

  The object of the present invention is to overcome these drawbacks by proposing a new ventilation system which is remarkable in that it essentially consists of a device for winding the plastic cord on the upper part of the greenhouse and a net covering the filmn, preventing the introduction of insects into the greenhouse when the vents are open. The net also allows, when the rope is wound, to filter out part of the light rays which would burn the crops if they were exposed directly. Finally, the net has a protective and reinforcing role for the plastic film it covers.

  during storms or hailstorms.

  The present invention also relates to a principle of shaping a gutter, formed from the above elements and allowing the evacuation of water between two twin greenhouses. The realization of a sash from already existing elements, by adding very little material, considerably simplifies the

Implementation.

  Other advantages and characteristics of the invention will become apparent on

  reading of the description below of given embodiments of the invention

  In by way of nonlimiting examples and illustrated by the accompanying drawings in which: - Figure I A and I B represent the principle of opening greenhouses with the

safety net.

  - Figure 2 shows the principle of the clipping rails for

  hold the plastic film ot / and the net.

  - Figure 3 shows the principle of forming a gutter from

plastic film.

  - Figure 4 shows the opening principle associated with a sheet metal gutter. - Figure 5 shows the principle of double opening associated with a

sheet metal channel.

  - Figure 6 shows the principle of forming a gutter in film

  plastic combined with a double opening principle.

  - Figure 7 shows a tension hook of the film and the net according to the

principle shown in figure 3.

  - Figures 8 and 8A shows variants of the tension hook.

  - Figure 9 shows a clevis fixing a clip rail on the

greenhouse structure.

  Figures 10 and I I show variants of the invention.

  The ventilation system according to the present invention can be adapted to a

  single greenhouse or a set of twin greenhouses.

  As can be seen in Figure 1, each greenhouse consists of a metal structure (1) formed from hoops of generally curved shape,

covered with plastic film (2).

  The plastic film (2) can for example be buried at the base of the greenhouse and held at the top by a clipping rail (3) according to the principle for example shown in FIG. 2. This clipping rail also makes it possible to hold the net (4) or any other fixed protective means. The net (4) can completely or partially cover the covered surface of the greenhouse. The net can also be associated with or replaced by one or more additional films such as an anti-ultraviolet filter or any other reinforcing or protective film. It will no longer be done

  mention of this additional film in the description below because the principle of

  1 embodiment is the same for one or more thicknesses of film or net. This additional film can obviously also be combined with the plastic film

  rollable without departing from the scope of the present invention.

  As shown in Figure 1, the net covers only the part of the greenhouse with an opening. It goes without saying that the ventilation system can be installed on either side of the greenhouse or on both sides

  as shown in Figure lB.

  The ventilation system consists of a movable bar (5) arranged in the longitudinal axis of the greenhouse, on which the film is wound. This bar (5) is held and guided by the structure of the greenhouse on which it rests and it is guided under the net. Each bar can be manually driven from a

  crank (6) attached to one or both ends.

  It is also conceivable to automate the opening system by connecting the various bars to one or more motor systems and possibly by slaving the assembly to temperature sensors,

rain or wind for example.

  According to a variant of the invention shown in Figure 10, the small ventilation be installed on the upper part of the greenhouse. In order to avoid any leakage when the ventilation is closed, a flap (35) is formed at

  the end of the fixed film, after the clipping rail (36) which holds it.

  The end of the flap (35) as well as all the free ends of the films can be folded around a wire (37) and held by a clipping system (38) of diameter corresponding to the wire (37). The wire (37) can for example 1o be iun wire made of elastomeric material. The rail (38) can then be fixed to the greenhouse by any known means. This implementation penrmet to avoid leaving the ends

of floating films.

  According to another variant shown in Figure 11, a bent structure (39) is arranged at the top of the greenhouse. The bent structure (39), consisting of an inclined part and a vertical part, is for example made of tubular material. The elbow (39) is covered with the plastic cord as well as the net. It is in the vertical part of the elbow that ventilation is carried out. This arrangement allows ventilation of the greenhouse while preventing rainwater from

enters the greenhouse.

  The present invention also relates to a system of pipes permitting the evacuation of water between two twin greenhouses. According to an advantageous characteristic of the invention, the channel is simply formed by the film (2) forming a pocket (7) shown in FIG. 3. The end of the rope on the side of the greenhouse having no opening is fixed to a clipping rail (8), itself fixed to the neighboring greenhouse. The clip rail (8) can be mounted laterally adjustable so that the tension of the pocket can be adjusted. This clipping rail must be positioned in such a way as not to hinder the unwinding of the

filmed (9).

  There is thus thus the creation of a pocket between the two greenhouses which will allow the water to flow. It is important to ensure that the movable bar (5), when the opening is closed again, comes to the inside of the pocket, so as to avoid any infiltration of water and air. So the net should be attached to

s inside the pocket.

  The end of the net and the bottom of the pocket are joined and stretched by

  through a clipping rail (10).

  According to an embodiment presented in FIG. 3, the clipping rail (10) is pulled down to ensure tension by means of hooks o (I1) fixed to a chain (12) or to any other tension system. The tensioning system can also consist of a rigid rod adjustable vertically. This rigid rod has the advantage of serving as a support for the pocket (7) and thus preventing it from tearing in the event of heavy snowfall

for example.

  The net and the bottom of the pocket are first clipped into the rail (7), then the rail is turned about a half-turn to be gripped by the hook. Figures 7, 8 and 8A show several possible embodiments of the hooks (11) which can also allow to join and maintain the

  ends of two clipping rails (10).

  A first embodiment of the hooks is shown in FIG. 7. The hook (13) can be made from stamped sheet metal for example. This hook is provided with a lower part (14) extending vertically and provided with means allowing the tension system (12) to be hooked. The upper part of the hook has a curved part allowing it to fit and hold the clipping rail (10). The hook can also be used to join the ends of two clipping rails. To this end, the ends of the two rails to be assembled are pierced and traversed by a rod (19) in the form of

  "U" itself clamped on the hook.

  Figures 8 and 8A show variants of these hooks according to

other forms of achievement.

  s In FIG. 8, the hook consists of a lower part pierced to allow the passage of the tension system (12). The drilling is carried out along an axis parallel to the axis of the clipping rail. The upper part is bent and drilled in order to introduce a bolt or any other coupling system allowing the hook and the clipping rail to be held. The clip rail must be

this effect also be pierced.

  FIG. 8A shows a variant allowing two clipping rails to be joined (10). The two hooks (17) and (18) are clamped to the rail by a rod in

<"U >> (19).

  The end of the thread (4) also engages in the clip rail.

  is Thus, by pulling down on the clipping rail (10), one can stretch on the one hand the film constituting the pocket but also the protective net of the rope. Several tension systems can be distributed along the length of the greenhouse. The end of the cable or of the tension chain can for example be fitted with a non-work piece

  depicted screwing into the earth.

  According to another embodiment shown in Figure 4, the channel is made from a folded sheet (15) or any other rigid or semi-rigid material. This folded sheet can be maintained at the stniructure of the greenhouse by screwing or riveting for example. In order to hold the ends of the film and the net, a clipping rail (16) is fixed inside the channel which allows

  maintain the net as well as the film.

  The clip rail (16) must be positioned so that the winding bar (5) can penetrate into the channel when the opening of the greenhouse

  is closed and thus allows the flow of water without infiltration into the greenhouse.

  FIG. 5 represents a variant for a system with two openings. The clip rail (20) is fixed to the center of the sheet metal channel and keeps the thread (4) taut. Thus, films (9) and (9 ') can be unrolled until

inside the gutter.

  FIG. 6 represents another variant of the invention. The gutter (21) is formed by a plastic film pocket (22) held at each end on each of the two twin greenhouses by two clipping rails (23) and (23 '), said

  rails being fixed on the greenhouse structure.

  The clamping and tensioning device (25) which will be described below can perfectly adapt to a double opening as well as to a single opening. The net (4) and the film (22) forming the gutter are held by the device (25). This device consists of a bar (24) disposed at the bottom of the

  pocket formed by the net (4) and the film (22) in the longitudinal axis of the gutter.

  The clamp (26) then makes it possible to hold the film and the net by trapping the bar (24) under its jaws (27). The end of the jaws may for example be surmounted by a clipping rail or any other profile allowing the effort to be distributed and thus to avoid tearing the film. The pressure of the jaws (27) is adjustable by means of the clamping system (28) with screws for example. The clamp (26) can consist for example of two parts (29) and (29 '), articulated together at their lower end and curved at their upper end to form the jaws (27). The lower end of the clamp must be able to be connected to the tensioning system (12) in order to tension the net and

the film forming the pocket.

  FIG. 9 represents a yoke making it possible to link a clipping rail (3) perpendicularly to the structure (1) of the greenhouse. This yoke consists of an upper element (30) allowing the perpendicular positioning of the clipping rail relative to the structure. The shape of this upper part makes it possible to match the shape of the structure of the greenhouse on its lower central part and to match the shape of the clipping rail on the upper part of its ends,

  said ends being pierced.

  Said yoke is further constituted by a lower element (31) the central part of which conforms to the shape of the greenhouse structure and the ends of which are drilled to allow the passage of a clamping rod (32) in the form of " U> ". The clip rail must also be drilled so as to allow the clamping rod (32) to pass. The rod (32) allows to hold the assembly by tightening nuts (33) and (33 '). The upper and lower parts of the screed can

  for example be made of stamped sheet metal.

Claims (15)

Claims   1 / Aeration system for greenhouse consisting of a structure (1) formed from generally curved form arches, said structure covered with a plastic film (2), system characterized in that it consists of an opening zone on the upper part of the greenhouse, by winding one or more parts of film (9) around a bar (5) in the longitudinal axis of the greenhouse, said opening zone being protected by a net or any other system   I) fixed protector (4) covering it.   2 / Aeration system according to claim 1 characterized in that the   net (4) covers the entire greenhouse.   3 / Aeration system according to claim 1 or claim 2   characterized in that the net (4) is replaced by or associated with an anti-film   ultraviolet or any other protective film.   4 / Aeration system according to claim I characterized in that the bars (5) are provided with a crank (6) at the tune or at both ends of   said bar, allowing to wind or unwind the film.   / Aeration system according to claim 1 characterized in that the bars are driven in rotation by motor systems possibly   subject to temperature and / or wind sensors for example.   6 / Oak associated with a ventilation system according to claim I characterized in that it is formed by the end of the film (2) on the side of the greenhouse having no opening, said end of the film being fixed on the neighboring greenhouse thus forming a pocket (7).   7 / Oak according to claim 6 characterized in that the end of the film (2) is held on the neighboring greenhouse by a clipping rail (8). 8 / gutter according to claim 6 characterized in that the end of the net (4) and the bottom of the pocket are held and stretched downwards by a   tensioning device (10), (11) and (12).   9 / gutter according to claim 8 characterized in that the tensioning device is composed of a clipping rail (10) holding the bottom of the pocket and the end of the net, of a hook (11) for holding the rail of clipping and a   tension system (12) connected to a fixed point.   / Gutter associated with a ventilation system according to claim 1, comprising a single opening on each greenhouse, characterized in that said gutter is formed from rigid or semi-rigid material such as sheet metal or any other material, the end of the fixed film (2) and the end of the net (4) being   held by a clipping rail fixed inside the gutter.   11 / Gutter associated with a ventilation system according to claim 1, comprising an opening on each side of the greenhouse, characterized in that said gutter is formed from rigid or semi-rigid material such as sheet metal or any other material, the ends of the threads (4) being held by a rail of   clipping fixed inside the gutter.   ll 12 / Gutter associated with a ventilation system according to claim 1, comprising an opening on each side of the greenhouse, characterized in that said gutter is formed by a pocket of plastic film (22) held at each   end on each of the two twin greenhouses.   13 / gutter according to claim 12 characterized in that the bottom of the pocket and possibly the protective net are stretched by a device tightening and tensioning (25).   14 / gutter according to claim 13 characterized in that the clamping and tensioning device (25) is composed: - of a bar (24) disposed at the bottom of the pocket formed by the film and the   net, in the longitudinal axis of the gutter.   - a clamp (26) consisting of two parts (29) and (29 '), articulated together at their lower end and bent at their upper end to form the jaws (27), said bar (24) being trapped between said jaws (27), the pressure between said jaws (27) being adjustable by means of a clamping system (28) with screws for example, the lower end of said clamp being connected to the tensioning system (12) linked at one point fixed.   / Aeration system according to any one of claims 1 to 5   characterized in that the plastic film (2) is held in clipping rails linked perpendicularly to the structure of the greenhouse by a yoke consisting of an upper element (30) matching the shape of the structure of the greenhouse (1) on its lower central part and matching the shape of the clipping rail (3) on the upper part of its ends, said ends being pierced, said yoke being further composed of a lower element (31) whose central part matches the shape of the structure of the greenhouse and the ends of which are drilled to allow the passage of a clamping rod (32) in the shape of a "U", said clipping rail also having to be pierced so as to allow the clamping rod (32 ), said rod (32) making it possible to hold the assembly by clamping nuts (33) and (33 ').  16 / gutter according to claim 9 characterized in that the hook (11) is composed of a lower part (14) extending vertically and provided with means allowing the attachment of the tension system (12), a part upper io with a curved part conforming to the shape of the clipping rail   (10) and allowing it to be held in order to exert a downward tension force.   17 / gutter according to claim 16 characterized in that the upper part of the hook and the clip rail are drilled to allow passage   i5 of a coupling system such as a bolt for example.   18 / gutter according to claim 17 characterized in that two hooks (17) and (18) are clamped to the rail by a "U" rod (19) to join two rails of clipping.   19 / gutter according to claim 16 characterized in that the upper part of the hook is pierced with two holes, allowing to join by a rod   in a "U" shape, the pierced ends of two clipping rails.   20 / Aeration system according to claim 1 characterized in that the free ends of the film (2) are folded around a wire (37) and held by a clipping system (38).   1X 21 / Aeration system according to claim 1 characterized in that a bent structure (39) is arranged at the top of the greenhouse, said bent structure consisting of an inclined part and a vertical part, the aeration being produced in the vertical part of said bent structure.