The present invention is relative to a roller mosquito net and, in particular, to a roller mosquito net with supports, preferably magnetic supports, adapted to avoid the formation of bends when the guide elements are stretched. Roller mosquito nets typically comprise a screen wound on a roller, which is supported by a vertical fixed sectional element fitted to the frame and is fixed, at its free end, to a sectional element that slides when it is manually pulled to open and close the screen itself.
Furthermore, during the opening and the closing procedure, the guide elements of the screen slide inside the sectional element, which is manually translated to open and close the screen. A typical example of a roller mosquito net is described in patent
Said guides, in the upper portion of the frame, tend to bend in the middle, when the mosquito net is completely stretched, especially if the window has one single opening and is very large.
This bending generates a passage that allows insects to enter the room that is supposed to remain insect-free, thus causing the mosquito net to loose its function of protection against insects.
The object of the present invention is to solve the problems described above by providing a mosquito net, which is provided with supports, preferably magnetic supports, which are suited to avoid the formation of bends when the upper guide elements are stretched.
The present invention will now be described with reference to the accompanying drawings, which illustrate a non-limiting embodiment, wherein:
With reference to
Mosquito net 1 comprises, furthermore, guide elements 14 and 24, which are respectively arranged on the upper and lower edge and are fixed, in correspondence to their first ends, to respective end pieces 15 and 26.
The other ends of guide elements 14 and 24 slide on rotation end pieces 18 and 19, which are firmly constrained to fixed sectional element 10, and, while sliding, they move forward inside fixed sectional element 10 itself.
The elements of upper guide 14, furthermore, slide inside a guide sectional element 9, which is supported by frame 20 of mosquito net 1.
In
Guide elements 14 ans 24 substantially form a chain of bodies 30, 30', which are hinged to each other.
Mosquito net 1 comprises, furthermore, support means, adapted to support upper guide element 14, for example by attracting element 14 towards sectional element 9, so as to keep said guide element 14 stretched and avoid the formation of bends when said mosquito net 1 is stretched. Said support means comprise a first magnetic portion 41, which is preferably made of a material with magnetic features, such as for example natural or induced magnets, and a second metal portion 42, which is made of a metal material adapted to interact with materials with magnetic features.
Portions 41 and 42 are respectively arranged, for example, on upper guide element 14 and inside sectional element 9, so as to interact with one another, for example by attracting one another until they strike one another thanks to the magnetic force generated by magnetic portion 41, so that metal portion 42 is attracted until it adheres to magnetic portion 41 itself.
Mosquito net 1 is operated by hand or by means of a motor, which, while rotating in a clockwise or anticlockwise direction, actuates the forward or backward movement of mobile sectional element 11, so as to allow screen 13 of mosquito net 1 to be stretch or retracted without manual operations.
During the stretching of screen 13 of said mosquito net 1, said support means interact with one another, so that guide element 14 does not form bends.
In the embodiment shown in
In the alternative embodiment shown in
Magnetic portion 41 preferably has an oblong sheet-like shape with a reduced thickness, adapted to avoid interferences with the sliding movement of mosquito net 1, when the latter is stretched of wound.
Magnetic portion 41 is fixed by means of fixing means, such as for example screws, or by means of gluing. Metal portion 42 preferably has an oblong sheet-like shape with a reduced thickness, adapted to avoid interferences with the normal sliding movement of mosquito net 1.
Metal portion 42 is fixed by means of fixing means, such as for example screws, or by means of gluing. Portions 41 or 42 are preferably fixed to bodies 30 and 30' on the upper surface of bodies 30 or 30' themselves and on the upper inner surface of sectional element 9.
Alternatively, said portions 41 or 42 are fixed on a lateral surface of said bodies 30 and 30' and, as a consequence, on the corresponding lateral inner surface of sectional element 9, so as to allow the interaction between said portions 41 or 42 with the purpose of avoiding the formation of bends. In the embodiment of mosquito net 1 shown in
In an embodiment of said mosquito net 1, magnetic portion 41 has a length that takes up almost the entire length of sectional element 9.
In a further embodiment of said mosquito net 1, there is a plurality of magnetic portions 42, which have a reduced length with respect to sectional element 9 and are fixed to sectional element 9 spaced apart at the same distance, so that the magnetic attraction effect is distributed on almost the entire length of sectional element 9.
In another embodiment of said mosquito net 1, there is a plurality of metal portions 42, which present a length that is equal to the length of body 30 or 30'.
As shown in
When the mobile sectional element overcomes the first half of the maximum extension of screen 13, it is necessary to support said guide element 14, in order to avoid the formation of bends.
In the explanatory and non-limiting solution, a plurality of bodies 30 or 30' are provided with a portion 41 or 42 of said support means, which are equally distributed, so that, during the stretching of said screen 13, said portions 41 or 42 interact in sequence with complementary portion 42 or 41, in order to support guide element 14.
The presence of support elements, furthermore, makes the sliding movement of bodies 30 and 30' easier, thus aiding the sliding movement of mobile sectional element 11, which allows a faster stretching of screen 13.
When mosquito net 1 has to be wound again, the force exerted by the motor to make mobile sectional element 11 get closer to fixed sectional element 10 is higher than the magnetic force that allows the interaction between magnetic portion 41 and metal portion 42.
In an alternative embodiment, sectional element 9 comprises metal portion 42, since sectional element 9 itself is made of a metal material adapted to interact with magnetic materials.
In a further embodiment, said sectional element 9 comprises magnetic portion 41, since at least one portion of the inner surface of said sectional element 9 is coated with a magnetic material.
In an alternative embodiment, said support means comprise at least one first magnetic portion 41 and at least one second magnetic portion, which are arranged on mosquito net 1 so that the surfaces that strike each other present an opposite polarity, in order to guarantee a magnetic attraction between the parts.
In a further embodiment, said support means comprise at least one first magnetic portion 41 and at least one second magnetic portion, wherein, for example, the first magnetic portion 41 is electronically controlled by an electronic circuit, adapted to change the magnetic polarity of said portion 41.
Said controlled polarity change of a magnetic portion causes the two magnetic portions to attract one another during the stretching of screen 13, while, when screen 13 is wound, the two magnetic portions repel one another due to the fact that, for example, magnetic portion 41 has changed its polarity, thus assuming the same polarity of the second magnetic portion.
Said electronic circuit polarizes said magnetic portions, in order to change its magnetic polarity, as a function of the commands transmitted to the motor. Said magnetic portion controlled by the electronic circuit is made of a conductive material, adapted to change its magnetic polarity as a function of a signal that has been applied to it.
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