WO2022229673A1 - Connecting device for anti-hail nets - Google Patents

Connecting device for anti-hail nets Download PDF

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Publication number
WO2022229673A1
WO2022229673A1 PCT/IB2021/053501 IB2021053501W WO2022229673A1 WO 2022229673 A1 WO2022229673 A1 WO 2022229673A1 IB 2021053501 W IB2021053501 W IB 2021053501W WO 2022229673 A1 WO2022229673 A1 WO 2022229673A1
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WO
WIPO (PCT)
Prior art keywords
connecting device
hail
plate
nets
plates
Prior art date
Application number
PCT/IB2021/053501
Other languages
French (fr)
Inventor
Claudio Cantelli
Original Assignee
Plastical S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plastical S.R.L. filed Critical Plastical S.R.L.
Priority to PCT/IB2021/053501 priority Critical patent/WO2022229673A1/en
Publication of WO2022229673A1 publication Critical patent/WO2022229673A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protecting plants
    • A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
    • A01G13/0206—Canopies, i.e. devices providing a roof above the plants

Definitions

  • This invention relates to a connecting device for anti hail nets.
  • the invention relates to an improved connecting device for anti-hail or anti-rain nets used in the agricultural sector.
  • anti hail nets In this description, reference is basically made to anti hail nets, however they also include sheets or other products of similar shape or use indifferently intended to protect crops from hail, rain, wind or insects.
  • Anti-hail nets are normally used for agricultural purposes to protect, from hail, fruit crops in which rows of fruit trees are distributed substantially parallel to each other.
  • the nets can be positioned relative to the plants to be protected, both by making two sloping sections, like a hut, and by means of a substantially flat arrangement, and also by enclosing the individual rows independently of each other. In any case, irrespective of the type of arrangement, in order to optimise both the installation costs and the use of these nets, they are connected both to each other and to suitable supporting elements such as, for example, wires or metal cables and/or tie rods.
  • the nets in order to guarantee a stable positioning and an equally stable retaining of the nets even in adverse weather conditions, the nets must be able to be secured to the respective supporting elements in a safe and reliable manner.
  • a further feature required in the application of the nets is that this operation can be performed quickly, since it may sometimes have to be carried out even in the event of imminent adverse weather conditions.
  • the aim of the invention is to provide a connecting device for anti-hail nets which overcomes the above- mentioned problems and is at the same time simple to make and practical to use.
  • a further aim of the invention is to provide a connecting device for anti-hail nets which is reliable and inexpensive to make.
  • FIG. 1 is a schematic perspective view, in an assembled configuration, of a first embodiment of a connecting device for anti-hail nets according to the invention
  • FIG. 2 is a schematic perspective view from above, in a disassembled configuration and with some components missing, of the connecting device for anti-hail nets of Figure 1;
  • FIG. 3 is a schematic perspective view, in an open configuration, of a second embodiment of a connecting device for anti-hail nets according to the invention.
  • FIG. 4 is a perspective top plan view of the connecting device for anti-hail nets of Figure 3;
  • FIGS. 5 and 6 are respective schematic perspective views from different angles of a third embodiment of a connecting device for anti-hail nets according to the invention.
  • FIG. 7 is a schematic perspective view, in an open configuration, of a fourth embodiment of a connecting device for anti-hail nets according to the invention.
  • FIG. 8 is a perspective top plan view of the connecting device for anti-hail nets of Figure 7;
  • FIG. 9 is a schematic perspective view, in an open configuration, of a fifth embodiment of a connecting device for anti-hail nets according to the invention.
  • - Figure 10 is a perspective top plan view of the connecting device for anti-hail nets of Figure 9,
  • FIGS. 11 and 12 are respective schematic perspective views from different angles, in an open configuration, of a sixth embodiment of a connecting device for anti-hail nets according to the present invention.
  • FIG. 13 is a plan top plan perspective view of the connecting device for anti-hail nets in figure 11.
  • the numeral 1 denotes in its entirety a connecting device for anti-hail nets made in accordance with the invention
  • the connecting device 1 for anti-hail nets comprises a first plate 2 and a second plate 3 which are shaped to match each other to engage each other in the clamping of anti-hail nets, not illustrated.
  • two portions of the same anti-hail net or two portions of separate anti-hail nets are interposed between the two first and second plates 2, 3 in such a way as to guarantee a stable mutual positioning.
  • the connecting device 1 in the embodiments illustrated in Figures 1 to 8, comprises a plurality of sharpened elements 4 emerging from the first plate 2, the sharpened elements 4 being configured to penetrate through the net and engage in respective housings 5 made in the second plate.
  • the embodiment of the connecting device 1 illustrated in Figures 9 and 10 is without the above-mentioned sharpened elements but has two through holes FI, F2, designed to face each other in a substantially coaxial manner when the two first and second plates 2, 3 engage each other.
  • the two above-mentioned holes FI, F2 are configured for engaging a screw, not illustrated, for mutually clamping the two plates 2 and 3.
  • the above-mentioned and not illustrated tightening screw is of the self-tapping type.
  • a internally threaded metallic hollow insert is stably inserted in one of the two above-mentioned holes FI, F2.
  • the embodiment of the connecting device 1 illustrated in Figures 11 to 13 is also devoid of the cited sharpened elements, but presents two pairs of through holes FI, F2, with respective holes FI, F2 of each pair designed to face each other in a substantially coaxial fashion when the first and second plates 2, 3 engage each other.
  • Said holes FI, F2 of each pair are configured to engage a respective screw, not illustrated, for reciprocally tightening the two plates 2 and 3.
  • the cited and not illustrated tightening screw is of the self-threading type.
  • an internally threaded metallic hollow insert is stably inserted into the cited holes F2.
  • both the first and second plates 2, 3 comprise a respective first structural portion 2a, 3a made of rigid thermoplastic material and a respective second surface portion 2b, 3b made of thermoplastic elastomeric material.
  • the connecting device 1 With reference to the first embodiment of the connecting device 1 illustrated in Figures 1 and 2, it comprises two pairs of first and second plates 2 and 3, with the first plates 2 slidably coupled to each other at the respective face opposite that from which the above- mentioned sharpened elements 4 emerge.
  • the slidable coupling between the above-mentioned first plates 2 is of known type and preferably but not necessarily comprises a snap-on locking element the disengagement of which is actuated by a tab 6.
  • first and second plates 2, 3 comprise a respective first structural portion 2a, 3a made of rigid thermoplastic material, whilst only in the second plates 3 is a respective second surface portion 3b made of thermoplastic elastomeric material.
  • Non-illustrated embodiments present respective second surface portions of thermoplastic elastomeric material on both the first and second plates 2, 3.
  • the first and second plates 2, 3 comprise a respective first structural portion 2a, 3a made of rigid thermoplastic material, whilst only in the second plate 3 is a respective second surface portion 3b made of thermoplastic elastomeric material.
  • the surface portion 3b made of elastomeric material has an annular extension which is approximately rectangular, and is designed, in a closed configuration not illustrated of the connecting device 1, to engage in a respective matching cavity 7, made in the second plate 2.
  • both the plates 2 and 3 have a respective second surface portion 2b, 3b made of thermoplastic elastomeric material.
  • the first structural portion 2a, 3a made of rigid thermoplastic material guarantees the mechanical strength of the device which, even if subjected to considerable forces, is able to remain integral and guarantee the required seal relative to the anti-hail nets.
  • the above-mentioned rigid thermoplastic material belongs to one of the chemical families included in the group consisting of polyamides, polyesters and filled or not filled polyolefins.
  • the above-mentioned rigid thermoplastic material is one between polyamide and polybutylene terephthalate (PBT).
  • the rigid thermoplastic material is filled with stiffening fibres such as, for example, glass fibres and/or mineral fibres.
  • the above-mentioned second surface portion 2b, 3b made of thermoplastic elastomeric material is designed not to damage the portion of anti-hail net, not illustrated, retained between the two first and second plates 2, 3.
  • thermoplastic elastomeric material of the second surface portion 2b, 3b is elastically deformable so as not to damage the portion of anti-hail net in the contact with the first structural portion 2a, 3a, when the portion of net is interposed between the two first and second plates 2, 3.
  • the rubbing, even prolonged, of the anti-hail net on it does not damage the latter unlike what could occur if the anti-hail net is rubbed with the more rigid material of the first structural portion 2a, 3a.
  • the damage could be even more accentuated if the rubbing occurred at the moulding burrs, which are notoriously sharp due to their negligible thickness and their often sharp shape.
  • thermoplastic material allows, in effect, the level of the stresses and the flattening which the first structural portion 2a, 3a imparts on the anti-hail net to be reduced. Moreover, the elastic deformability of the thermoplastic material reduces the relative movements between the first plate 2 and the second plate 3, preventing the net from being pulled and/or flattened by these relative movements.
  • thermoplastic elastomeric material belongs to the family of thermoplastic elastomers (TPE) also styrenic based (TPE-S), or thermoplastic rubbers.
  • TPE thermoplastic elastomers
  • TPE-S styrenic based
  • thermoplastic rubbers thermoplastic rubbers
  • the above-mentioned thermoplastic elastomeric material is a polyethylene.
  • the second surface portion made of thermoplastic elastomeric material is configured so as not to affect either the above-mentioned sharpened elements 4 or the respective housings 5.
  • thermoplastic elastomeric material could in effect result in damage to the latter with negative consequences on the effectiveness of the connecting device 1.
  • moulding burrs which are in any case present in the first structural portion 2a, 3a of each plate 2, 3, it is advantageous if the second surface portion 2b, 3b made of thermoplastic elastomeric material is configured to prevent the anti-hail net, when interposed between the first and second plates 2, 3, from striking against the moulding burs.
  • the above-mentioned second portion 2b, 3b made of thermoplastic elastomeric material is made by overmoulding.
  • the second portion 2b, 3b made of thermoplastic elastomeric material overmoulded on the first structural portion 2a, 3a made of rigid thermoplastic material guarantees optimum adhesion of the two portions 2a, 3a, 2b, 3b.
  • the connecting device 1 in the second, fourth, fifth and sixth embodiments comprises two hinge connecting elements 8 between the above-mentioned first plate 2 and second plate 3.
  • the hinge-like connecting elements 8 are advantageously made of rigid thermoplastic material, in a single body with the first structural portion 2a, 3a of each of the two first and second plates 2, 3.
  • the connecting elements 8 also contain a cover made of thermoplastic elastomeric material.
  • the above-mentioned rigid thermoplastic material is in any case sufficiently elastically deformable to allow the two plates 2, 3 to bend on each other.
  • Non-illustrated embodiments of the devices shown in Figures 2, 4 and 7 to 13 does not present connecting elements 8.
  • the connecting device according to the present invention has hooks and/or rings for allowing connection to wires, cables or other supporting elements of an agricultural plant such as an orchard or the like.
  • the connecting device for anti-hail nets according to the invention achieves the preset aims and brings important advantages.
  • thermoplastic elastomeric material of the second surface portion 2b, 3b which retains it gently without wear and, above all, also prevents those limited relative movements between the plates and the net which in the long term can cause deterioration and breakages in the net.
  • a further advantage linked to the use of a connecting device according to the invention is due to the fact that the presence of the second portion made of elastomeric thermoplastic material prevents direct contact with portions which may also be sharp (for example moulding burrs or sharp edges) of the plates.

Abstract

Described is a connecting device for anti-hail nets, comprising a first plate (2) and a second plate (3) which are shaped to match each other to engage each other in the clamping of anti-hail nets, means (4, 5) for clamping the first and second plates to guarantee the stable maintaining of a locked position of at least one portion of the anti-hail net interposed between the plates (2, 3).

Description

CONNECTING DEVICE FOR ANTI-HAIL NETS
Technical field
This invention relates to a connecting device for anti hail nets.
More specifically, the invention relates to an improved connecting device for anti-hail or anti-rain nets used in the agricultural sector.
In this description, reference is basically made to anti hail nets, however they also include sheets or other products of similar shape or use indifferently intended to protect crops from hail, rain, wind or insects.
Background art
Anti-hail nets are normally used for agricultural purposes to protect, from hail, fruit crops in which rows of fruit trees are distributed substantially parallel to each other.
Different types of nets have recently been introduced, especially with regard to fruit growing, to protect the fruits not only from hail but also from rain and insects. Irrespective of the specific purposes of the various possible nets, the connecting devices are substantially the same and, therefore, the device according to the invention must be considered to be designed for all types of nets.
There are many ways in which the nets can be positioned relative to the plants to be protected, both by making two sloping sections, like a hut, and by means of a substantially flat arrangement, and also by enclosing the individual rows independently of each other. In any case, irrespective of the type of arrangement, in order to optimise both the installation costs and the use of these nets, they are connected both to each other and to suitable supporting elements such as, for example, wires or metal cables and/or tie rods.
In other words, in order to guarantee a stable positioning and an equally stable retaining of the nets even in adverse weather conditions, the nets must be able to be secured to the respective supporting elements in a safe and reliable manner.
It is also necessary that the fixing/connection operations for the nets can be easy and practical to perform also by the farmer, without the necessary intervention of specialised operators.
A further feature required in the application of the nets is that this operation can be performed quickly, since it may sometimes have to be carried out even in the event of imminent adverse weather conditions.
In order to provide farmers with practical, fast, economical and effective fixing systems, many different types of connecting devices have been developed over the years, the common aspect of which is that of having a body made of plastic material and coupling means for gripping on the nets and, if necessary, also on the above-mentioned wires or cables.
The prior art devices, even though they have offered many and alternative solutions to the needs of the farmers, have not always been found to be free from drawbacks.
One of these drawbacks is without doubt due to the fact that since in practice they are always devices made by moulding plastic material, they very often have machining irregularities or burrs which in the long run, with the tensioning and the continuous movement (even merely caused by the wind) to which the nets are subjected in use, cause tears or breakages in the nets. These breaks, if widespread, may cause an accelerated and undesired degradation of the covers which must consequently be replaced before their estimated duration.
Since they have large extensions and as a result are a significant investment, a replacement of the nets before planned with respect to their expected life can easily compromise the economics of an entire production year. On the other hand, the extremely low unit cost imposed by the market for these plastic elements does not justify further finishing operations on them such as, for example, a step of finishing the moulding burrs.
Aim of the invention
The aim of the invention is to provide a connecting device for anti-hail nets which overcomes the above- mentioned problems and is at the same time simple to make and practical to use.
A further aim of the invention is to provide a connecting device for anti-hail nets which is reliable and inexpensive to make.
The above-mentioned aims are achieved by a connecting device for anti-hail nets comprising the technical features described in one or more of the appended claims.
Brief description of the drawings
Further features and advantages of the invention are more apparent in the detailed description which follows, with reference to the accompanying drawings which illustrate non-limiting example embodiments of the invention and in which:
- Figure 1 is a schematic perspective view, in an assembled configuration, of a first embodiment of a connecting device for anti-hail nets according to the invention;
- Figure 2 is a schematic perspective view from above, in a disassembled configuration and with some components missing, of the connecting device for anti-hail nets of Figure 1;
- Figure 3 is a schematic perspective view, in an open configuration, of a second embodiment of a connecting device for anti-hail nets according to the invention;
- Figure 4 is a perspective top plan view of the connecting device for anti-hail nets of Figure 3;
- Figures 5 and 6 are respective schematic perspective views from different angles of a third embodiment of a connecting device for anti-hail nets according to the invention;
- Figure 7 is a schematic perspective view, in an open configuration, of a fourth embodiment of a connecting device for anti-hail nets according to the invention;
- Figure 8 is a perspective top plan view of the connecting device for anti-hail nets of Figure 7;
- Figure 9 is a schematic perspective view, in an open configuration, of a fifth embodiment of a connecting device for anti-hail nets according to the invention; - Figure 10 is a perspective top plan view of the connecting device for anti-hail nets of Figure 9,
- Figures 11 and 12 are respective schematic perspective views from different angles, in an open configuration, of a sixth embodiment of a connecting device for anti-hail nets according to the present invention;
- Figure 13 is a plan top plan perspective view of the connecting device for anti-hail nets in figure 11.
Detailed description of preferred embodiments of the invention
With reference to Figures 1 to 13, the numeral 1 denotes in its entirety a connecting device for anti-hail nets made in accordance with the invention
The connecting device 1 for anti-hail nets comprises a first plate 2 and a second plate 3 which are shaped to match each other to engage each other in the clamping of anti-hail nets, not illustrated.
In other words, without distinction, two portions of the same anti-hail net or two portions of separate anti-hail nets are interposed between the two first and second plates 2, 3 in such a way as to guarantee a stable mutual positioning.
For this purpose, the connecting device 1, in the embodiments illustrated in Figures 1 to 8, comprises a plurality of sharpened elements 4 emerging from the first plate 2, the sharpened elements 4 being configured to penetrate through the net and engage in respective housings 5 made in the second plate.
The embodiment of the connecting device 1 illustrated in Figures 9 and 10 is without the above-mentioned sharpened elements but has two through holes FI, F2, designed to face each other in a substantially coaxial manner when the two first and second plates 2, 3 engage each other. The two above-mentioned holes FI, F2 are configured for engaging a screw, not illustrated, for mutually clamping the two plates 2 and 3.
Advantageously, the above-mentioned and not illustrated tightening screw is of the self-tapping type. Alternatively, in variant embodiments not illustrated, a internally threaded metallic hollow insert is stably inserted in one of the two above-mentioned holes FI, F2. Similarly to what has just been described, the embodiment of the connecting device 1 illustrated in Figures 11 to 13 is also devoid of the cited sharpened elements, but presents two pairs of through holes FI, F2, with respective holes FI, F2 of each pair designed to face each other in a substantially coaxial fashion when the first and second plates 2, 3 engage each other.
Said holes FI, F2 of each pair are configured to engage a respective screw, not illustrated, for reciprocally tightening the two plates 2 and 3.
Advantageously, the cited and not illustrated tightening screw is of the self-threading type.
Alternatively, according to not shown embodiments, an internally threaded metallic hollow insert is stably inserted into the cited holes F2.
The sharpened elements 4 and the respective housings 5, together with the above-mentioned and not illustrated fastening screws define in their entirety, for the connecting device 1 in its various embodiments, respective means for clamping the first and second plates
2, 3.
With reference to the second, third fourth and sixth embodiments of the connecting device 1, illustrated respectively in Figures 3 and 4, 5 and 6, 7 and 8, and 11 to 13, both the first and second plates 2, 3 comprise a respective first structural portion 2a, 3a made of rigid thermoplastic material and a respective second surface portion 2b, 3b made of thermoplastic elastomeric material.
With reference to the first embodiment of the connecting device 1 illustrated in Figures 1 and 2, it comprises two pairs of first and second plates 2 and 3, with the first plates 2 slidably coupled to each other at the respective face opposite that from which the above- mentioned sharpened elements 4 emerge.
The slidable coupling between the above-mentioned first plates 2 is of known type and preferably but not necessarily comprises a snap-on locking element the disengagement of which is actuated by a tab 6.
Again with reference to the first embodiment of the connecting device 1 illustrated in Figures 1 and 2, all four first and second plates 2, 3 comprise a respective first structural portion 2a, 3a made of rigid thermoplastic material, whilst only in the second plates 3 is a respective second surface portion 3b made of thermoplastic elastomeric material.
Non-illustrated embodiments present respective second surface portions of thermoplastic elastomeric material on both the first and second plates 2, 3. With reference to the fifth embodiment of the connecting device 1 illustrated in Figures 9 and 10, in it the first and second plates 2, 3 comprise a respective first structural portion 2a, 3a made of rigid thermoplastic material, whilst only in the second plate 3 is a respective second surface portion 3b made of thermoplastic elastomeric material.
As clearly illustrated in Figure 9, the surface portion 3b made of elastomeric material has an annular extension which is approximately rectangular, and is designed, in a closed configuration not illustrated of the connecting device 1, to engage in a respective matching cavity 7, made in the second plate 2.
According to possible variants, not illustrated, of the fifth embodiment of the connecting device 1 illustrated in Figures 9 and 10, both the plates 2 and 3 have a respective second surface portion 2b, 3b made of thermoplastic elastomeric material.
Generally speaking, with reference to all the embodiments illustrated of the connecting device 1, the first structural portion 2a, 3a made of rigid thermoplastic material guarantees the mechanical strength of the device which, even if subjected to considerable forces, is able to remain integral and guarantee the required seal relative to the anti-hail nets.
Advantageously, the above-mentioned rigid thermoplastic material belongs to one of the chemical families included in the group consisting of polyamides, polyesters and filled or not filled polyolefins. Preferably, but not necessarily, the above-mentioned rigid thermoplastic material is one between polyamide and polybutylene terephthalate (PBT).
Advantageously, the rigid thermoplastic material is filled with stiffening fibres such as, for example, glass fibres and/or mineral fibres.
The above-mentioned second surface portion 2b, 3b made of thermoplastic elastomeric material is designed not to damage the portion of anti-hail net, not illustrated, retained between the two first and second plates 2, 3.
In other words, the thermoplastic elastomeric material of the second surface portion 2b, 3b is elastically deformable so as not to damage the portion of anti-hail net in the contact with the first structural portion 2a, 3a, when the portion of net is interposed between the two first and second plates 2, 3.
In addition, given the deformability characteristics of the elastomeric material of the second surface portion 2b, 3b, the rubbing, even prolonged, of the anti-hail net on it does not damage the latter unlike what could occur if the anti-hail net is rubbed with the more rigid material of the first structural portion 2a, 3a. The damage could be even more accentuated if the rubbing occurred at the moulding burrs, which are notoriously sharp due to their negligible thickness and their often sharp shape.
The deformability of the thermoplastic material allows, in effect, the level of the stresses and the flattening which the first structural portion 2a, 3a imparts on the anti-hail net to be reduced. Moreover, the elastic deformability of the thermoplastic material reduces the relative movements between the first plate 2 and the second plate 3, preventing the net from being pulled and/or flattened by these relative movements.
In this way, the integrity of the anti-hail net over time is guaranteed.
In general, the thermoplastic elastomeric material belongs to the family of thermoplastic elastomers (TPE) also styrenic based (TPE-S), or thermoplastic rubbers. Advantageously, the above-mentioned thermoplastic elastomeric material is a polyethylene.
Advantageously, the second surface portion made of thermoplastic elastomeric material is configured so as not to affect either the above-mentioned sharpened elements 4 or the respective housings 5.
A contact between the sharpened elements 4 and the thermoplastic elastomeric material could in effect result in damage to the latter with negative consequences on the effectiveness of the connecting device 1.
With reference to the above-mentioned and not illustrated moulding burrs, which are in any case present in the first structural portion 2a, 3a of each plate 2, 3, it is advantageous if the second surface portion 2b, 3b made of thermoplastic elastomeric material is configured to prevent the anti-hail net, when interposed between the first and second plates 2, 3, from striking against the moulding burs.
In the connecting device 1 according to the invention, the above-mentioned second portion 2b, 3b made of thermoplastic elastomeric material is made by overmoulding.
The second portion 2b, 3b made of thermoplastic elastomeric material overmoulded on the first structural portion 2a, 3a made of rigid thermoplastic material guarantees optimum adhesion of the two portions 2a, 3a, 2b, 3b.
With reference to Figures 2, 4 and 7 to 13, the connecting device 1 in the second, fourth, fifth and sixth embodiments comprises two hinge connecting elements 8 between the above-mentioned first plate 2 and second plate 3.
The hinge-like connecting elements 8 are advantageously made of rigid thermoplastic material, in a single body with the first structural portion 2a, 3a of each of the two first and second plates 2, 3.
According to alternative embodiments not illustrated, the connecting elements 8 also contain a cover made of thermoplastic elastomeric material.
Obviously, the above-mentioned rigid thermoplastic material is in any case sufficiently elastically deformable to allow the two plates 2, 3 to bend on each other.
Non-illustrated embodiments of the devices shown in Figures 2, 4 and 7 to 13 does not present connecting elements 8.
Advantageously, in certain embodiments, the connecting device according to the present invention has hooks and/or rings for allowing connection to wires, cables or other supporting elements of an agricultural plant such as an orchard or the like. The connecting device for anti-hail nets according to the invention achieves the preset aims and brings important advantages.
A first of these advantages is due to the fact that the anti-hail net is clamped in contact with a material, the thermoplastic elastomeric material of the second surface portion 2b, 3b, which retains it gently without wear and, above all, also prevents those limited relative movements between the plates and the net which in the long term can cause deterioration and breakages in the net.
A further advantage linked to the use of a connecting device according to the invention is due to the fact that the presence of the second portion made of elastomeric thermoplastic material prevents direct contact with portions which may also be sharp (for example moulding burrs or sharp edges) of the plates.

Claims

1. Connecting device for connecting anti-hail nets, comprising:
- a first plate (2) and a second plate (3) with counter-shape to engage each other in the clamping of anti-hail nets;
- fastening means to fasten said first plate (2) and second plate (3) and to ensure the stable holding of a fastening position of at least one portion of the hail net between said first (2) and second (3) plate, characterized in that at least one of said first (2) and second (3) plate comprises a first structural portion (2a, 3a) made of rigid thermoplastic material and a second superficial portion (2b, 3b) made of thermoplastic elastomeric material, said second portion elastically deformable for not damaging said portion of the anti-hail net.
2. Connecting device according to claim 1, characterized in that both said first and second plates (2, 3) comprise a respective first structural portion (2a, 3a) made of rigid thermoplastic material and a respective second superficial portion (2b, 3b) made of thermoplastic elastomeric material.
3. Connecting device according to any one of the preceding claims, characterized in that said second portion (2b, 3b) of thermoplastic elastomeric material is made by overmoulding.
4. Connecting device according to any one of the preceding claims, characterized in that said rigid thermoplastic material belongs to one of the chemical families included in the group consisting of polyamides, polyesters and filled or not filled polyolefins.
5. Connecting device according to any one of the preceding claims, characterized in that said thermoplastic elastomeric material is a polyethylene.
6. Connecting device according to any one of the preceding claims, characterized in that said fastening means comprise a plurality of sharpened elements (4) emerging from a first of said first
(2) and second (3) plate and configured to penetrate through the net and snap into their respective housings (5) obtained in the other of said first and second plate (2, 3), said second superficial portion (2b, 3b) made of thermoplastic elastomeric material not affecting either said sharpened elements (4) nor said housings (5).
7. Connecting device according to any one of the preceding claims, in which said first (2) and second
(3) plates are moulded and have respective moulding burrs, characterized in that said second superficial portion (2b, 3b) made of thermoplastic elastomeric material is configured to prevent said anti-hail net when placed between said plates (2, 3) first and second from hitting said moulding burrs of said plates (2, 3).
8. Connecting device according to any one of the preceding claims, including hinged connection elements (8) between said first (2) and second (3) plate, characterized in that said hinged connection elements (8) are made of rigid thermoplastic material.
PCT/IB2021/053501 2021-04-28 2021-04-28 Connecting device for anti-hail nets WO2022229673A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0898878A1 (en) * 1997-08-27 1999-03-03 WLZ Raiffeisen AG Connecting device for nets protecting against hail
FR2876009A1 (en) * 2003-11-25 2006-04-07 Milon Sarl Ets Flat articles e.g. safety net, assembling device for fruit culture, has male slider cooperating with female slider such that male fixing plate slides with respect to female fixing plate, during assembling of plates
EP1716747A1 (en) * 2005-04-29 2006-11-02 Helios S.r.l. A device for protection against hailstones.
EP2108503A1 (en) * 2008-04-07 2009-10-14 Sefar AG Fixing element for flat fibrous material and method for fixing flat fibrous material
EP3821700A1 (en) * 2019-11-13 2021-05-19 Plastical S.r.l. Connecting device for anti-hail nets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0898878A1 (en) * 1997-08-27 1999-03-03 WLZ Raiffeisen AG Connecting device for nets protecting against hail
FR2876009A1 (en) * 2003-11-25 2006-04-07 Milon Sarl Ets Flat articles e.g. safety net, assembling device for fruit culture, has male slider cooperating with female slider such that male fixing plate slides with respect to female fixing plate, during assembling of plates
EP1716747A1 (en) * 2005-04-29 2006-11-02 Helios S.r.l. A device for protection against hailstones.
EP2108503A1 (en) * 2008-04-07 2009-10-14 Sefar AG Fixing element for flat fibrous material and method for fixing flat fibrous material
EP3821700A1 (en) * 2019-11-13 2021-05-19 Plastical S.r.l. Connecting device for anti-hail nets

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