Patent Description:
Outdoor cover structures provided with columns for ground support, supporting crossbars, fixed or movable, rigid or soft/flexible roof are known since a long time. Bioclimatic or pergo-clima pergolas are self-supporting outdoor structures comprising columns and crossbars defined by extruded box structures, preferably in aluminium. Movable pergolas or blades are connected to the crossbars and arranged side by side to define a bioclimatic pergola roof. The movable blades are connected to a motor that allows to vary their inclination to adjust the amount of light penetrating through the roof. In a closing position, the movable blades lie close together and seal so as to prevent the passage of water.

There are known bioclimatic pergolas that allow, in addition to adjust the inclination of the blades, to arrange them packed on one side of the structure so as to open the roof completely.

In this regard, there are known bioclimatic pergolas having two independent movements: one to vary the inclination of the blades and the other to pack said blades on one side of the structure.

The public document <CIT> shows a system having a plurality of glass plates mounted on a roof or on a wall of a building. The plates are mounted so that they can be rotated and translated. The system comprises a first adjustment mechanism which guides the rotation of the plates without the translation movement of those plates happening and a second adjustment mechanism which guides the translation movement of the plates without the rotation thereof. Each of the plates has, at each of their ends, a pivot joint which allows it to rotate and comprises an actuation lever the end thereof has a roller engaged with a pair of guide rails. Guide rails have recesses arranged at regular intervals. When the two guide rails are positioned one with respect to the other so that the recesses are mutually aligned, the rollers are positioned in the recesses in a lowered position and the plates are closed. If the guide rails are displaced one with respect to the other, the recesses are reduced, the rollers are moved outside the recesses so as to rotate the plates and bring them in an opening position. If the recesses are completely offset, the rollers and the plates can be displaced while keeping a constant height.

In this context, the Applicant has noted that cover structures of known type, such as those above described, can be improved in several aspects, in particular with reference to the precision of movements, constructive simplicity, durability, reliability, maintainability of the structure as a whole and in particular of the elements dedicated to the movement of the blades.

In this regard, the Applicant has perceived the need to:.

The Applicant has found that the above-mentioned objects and others can be achieved by means of a cover structure, optionally for outdoors, preferably a bioclimatic pergola, according to one or more of the attached claims and/or the following aspects.

In particular, the present invention has as its object a cover structure, optionally for outdoors (bioclimatic pergola), comprising:.

The Applicant has first of all verified that the rotation mechanism according to the invention allows to obtain smooth and precise rotations of the blades during the opening and the closing.

The Applicant has verified that the rotation mechanism according to the invention allows to avoid blockages of the blades in undesired positions.

In particular, the Applicant has in particular verified that the anti-stall bar ensures the rotation in closing of the blades even if the center of gravity of the blades themselves is in an unfavourable position and/or if on the blades act forces that oppose their closing, such as for example due to atmospheric agents, such as gusts of wind.

The Applicant has also verified that the rotation mechanism according to the invention is relatively simple, reliable, relatively cheap and easy and inexpensive to maintain.

The Applicant has also verified that the mechanism according to the invention comprises a reduced number of components while still ensuring an optimal functionality of the cover structure.

Further non-limiting aspects of the invention are listed below.

In an aspect, a rotation mechanism is mounted on each of the two beams.

In an aspect, the anti-stall device comprises a bar engaged with the ends of the arms.

In an aspect, the bar extends parallel to respective beam.

In an aspect, the anti-stall device comprises an anti-stall actuator coupled to the bar. In an aspect, the anti-stall actuator is configured to move the bar between a first position and a second position, wherein in the second position the ends of the arms are on a bottom of the seats.

In an aspect, the bar is movable between the first position and the second position keeping parallel to itself and to the respective beam.

In an aspect, the anti-stall actuator comprises at least one anti-stall spring constrained to the bar and to the beam so as to pull or to push the bar towards the second position.

In an aspect, said anti-stall spring is constrained to a lower wall of the respective beam and to a lower portion of the bar.

In an aspect, the ends of the arms comprise an anti-stall roller or an anti-stall slider engaged with the bar.

In an aspect, said anti-stall roller or anti-stall slider is housed in a recess bonded by the C-section of the bar.

In an aspect, in the open configuration of the blades, a center of gravity of each blade is, with respect to a vertical direction passing through the rotation axis, on an opposite side with respect to the respective arm, so that the anti-stall device is configured to generate, with respect to the rotation axis, an angular momentum opposite to an angular momentum generated by the weight of the blade.

In an aspect, in the closed configuration of the blades, the roof is horizontal or substantially horizontal.

In an aspect, the guide rail is movable along the actuation direction between a first position, wherein the ends of the arms lie outside the seats, and a second position, wherein the ends of the arms lie inside the seats.

In an aspect, during the movement from the first towards the second position of the guide rail, said at least one anti-stall spring pulls or pushes the bar towards the second position of said bar.

In an aspect, during the movement from the second towards the first position of the guide rail, the support edge pushes, in contrast to said at least one anti-stall spring, the ends of the arms and thus also the bar towards the first position of said bar.

In an aspect, during the movement from the second towards the first position of the guide rail, the support edge pushes, in contrast to said at least a spring, the ends of the arms outside the seats.

In an aspect, the guide rail is an elongated plate and the support edge is an upper edge of the plate.

In an aspect, the seats are recesses obtained on the support edge of the plate.

In an aspect, the seats are as many as the blades.

In an aspect, the seats are equally spaced between them.

In an aspect, the ends of the arms comprise a guiding roller or a guiding slider engaged with the support edge of the guide rail.

In an aspect, the guiding roller or guiding slider is mounted on an opposite side of the arm with respect to the anti-stall roller or anti-stall slider.

In an aspect, the blades are configured to be arranged in a packed configuration, in which said blades lie packed at at least one side of the support structure.

In an aspect, in the packed configuration, each blade is inclined, as in the open configuration, and lies close together with an adjacent blade.

In an aspect, each beam comprises a respective track housing the rotation shafts. In an aspect, the rotation shafts are configured to slide along the respective track. In an aspect, the cover structure comprises a translation device mounted on at least one of the two beams and operatively coupled to the blades.

In an aspect, the cover structure comprises a translation device mounted on each of the two beams.

In an aspect, the translation device is configured to determine the translation of the shafts and of the blades along the tracks.

In an aspect, the translation device is configured to move the blades between the open configuration and the packed configuration.

In an aspect, an auxiliary guide rail is flanked by the guide rail and has an auxiliary support edge having a plurality of recesses.

In an aspect, in at least one position of the guide rail along the actuation direction, the seats and the recesses are mutually offset so that the support edge and the auxiliary support edge form a continuous surface for the ends of the arms and said ends of the arms slide on said continuous surface without entering the seats.

In an aspect, said continuous surface is straight and horizontal.

In an aspect, when the guide rail is in the first position, the seats and the recesses are mutually offset to form the continuous surface.

In an aspect, when the guide rail is in the second position, the seats and the recesses are at least partially mutually aligned to allow the ends of the arms to position themselves inside the seats.

In an aspect, the auxiliary guide is composed by one element or by a plurality of elements and the auxiliary support edge is an upper edge of said element or plurality of elements.

In an aspect, the recesses are recesses obtained on the auxiliary support edge of the element or plurality of elements.

In an aspect, the recesses are as many as the blades.

In an aspect, the recesses are equally spaced between them.

In an aspect, each of the recesses has a longitudinal extension, i.e. measured along the longitudinal extension of the auxiliary guide (parallel to the beam), greater than a longitudinal extension of each seat.

In an aspect, the ends of the arms comprise an auxiliary guiding roller or an auxiliary guiding slider engaged with the auxiliary support edge of the auxiliary guide.

In an aspect, the auxiliary guiding roller or the auxiliary guiding slider is flanked by the guiding roller or the guiding slider.

In an aspect, the guide rail and the auxiliary guide are lie close together.

In an aspect, the auxiliary guide is fixed with respect to the beam.

In an aspect, the guide rail has elongated slots and the auxiliary guide comprises pins housed in the elongated slots so as to slide in said elongated slots.

In an aspect, the actuator is configured to pull or push the guide rail towards the first position and is configured to push or pull the guide rail towards the second position. In an aspect, the actuator comprises a spring configured to pull or push the guide rail towards the first position and an auxiliary motor configured to push or pull the guide rail towards the second position.

In an aspect, the translation device comprises: a carriage constrained to the shaft of an end blade; a main motor operatively coupled to the carriage to move it parallel to the track together with the end blade; constraint elements engaged to successive shafts of the blades, so that a translation of the carriage and of the end blade drags the remaining blades from the packed configuration towards the open configuration. In an aspect, each constraining element is flexible and optionally comprises a cable. In an aspect, the carriage is mounted on the respective shaft so as to allow said shaft to rotate with respect to said carriage.

In an aspect, the carriage comprises a blocking element configured to prevent the rotation, also limited, of said carriage with respect to the beam during the displacement parallel to the track (translation of the carriage).

In an aspect, the blocking element comprises a fork element integral with the carriage.

In an aspect, the fork element extends towards the remaining blades and engages the shaft of at least one of said remaining blades so as to prevent the rotation of said carriage.

In an aspect, the fork element comprises two tines and said shaft is inserted between the two tines.

In an aspect, the two tines extend parallel to the respective track.

In an aspect, when the blades are in the packed configuration, the fork element engages a plurality of said shafts.

In an aspect, when the blades are in the open or closed configuration, the fork element engages at least one of said shafts.

In an aspect, the translation device comprises a belt wrapped on pulleys.

In an aspect, the carriage is integral with a branch of the belt, optionally with an upper branch of the belt.

In an aspect, at least one of the pulleys is connected to the main motor.

Further features and advantages will result better from the following detailed description of a preferred but non-limiting embodiment of a cover structure.

This description will be expressed hereinafter with reference to the attached figures, provided for illustrative purposes only and therefore non-limiting, wherein:.

With reference to the above-mentioned figures, a cover structure for outdoors, i.e. a bioclimatic pergola, according to the present invention has been overall indicated with the reference number <NUM>.

The bioclimatic pergola <NUM> shown comprises a support structure formed by four vertical columns <NUM> (of which only three are visible in <FIG>) configured to lie on the ground "S", by horizontal beams (two first beams 3a and two second beams 3b) connecting between them the columns <NUM> and defining a peripheral support structure <NUM>, a roof <NUM> mounted on the peripheral support structure <NUM>, a plurality of panels <NUM> configured to laterally close the bioclimatic pergola <NUM>. The columns <NUM> and the beams 3a, 3b are each, for example, formed by one or more aluminium extruded profiles defining box structures.

As better seen in <FIG>, the roof <NUM> comprises a plurality of blades or pergolas <NUM> movable, about respective rotation axes X-X and in translation, between a closed configuration (<FIG>, <FIG>, <FIG>, <FIG>, <FIG>), an open configuration (<FIG>, <FIG>) and a packed configuration (<FIG>, <FIG>).

The blades <NUM> are parallel to each other, parallel to the first beams 3a and orthogonal to the second beams 3b.

In the closed configuration (<FIG>, <FIG>, <FIG>, <FIG>, <FIG>), the blades <NUM> lie close together so as to prevent the passage of sun rays and possibly also the passage of water; the roof is horizontal or substantially horizontal.

In the open configuration (<FIG>, <FIG>), the blades <NUM> are rotated upwards so as to open passages between a blade <NUM> and the adjacent one.

In the packed configuration (<FIG>, <FIG>), the blades <NUM> are rotated as in the open configuration, placed against each other and displaced towards one of the first beams 3a so as to completely open the roof <NUM>.

<FIG> and <FIG> show an intermediate configuration between the closed and the open one, in which the blades <NUM> are partially rotated.

The blades <NUM> have each one an elongated shape that mainly develops along a longitudinal direction. The blades <NUM> are all oriented according to this longitudinal direction and are parallel to each other.

The blades <NUM> are arranged orthogonally to the two second beams 3b of greater length and parallel to each other.

Each blade <NUM> has an upper face, intended as directed outwards (with respect to the space covered or bonded by the cover structure, i.e. upwards in the attached figures) when they are in the closed configuration, and a lower face, intended as directed inwards (with respect to the space covered or bonded by the cover structure, i.e. downwards in the attached figures) when they are in the closed configuration. Each blade <NUM> has a major front edge <NUM> and a major rear edge <NUM> parallel to each other and to the longitudinal direction.

In the non-limiting embodiment shown, in the closed configuration (<FIG> and <FIG>), the major front edge <NUM> of a blade <NUM> is placed on the major rear edge <NUM> of the adjacent blade <NUM> and a slit between two blades <NUM> is closed upperly.

Each of the two opposed longitudinal ends of the blade <NUM> is connected and supported by a blade holder <NUM>, better seen in <FIG>, <FIG>, <FIG>. The blade holder <NUM> has a seat, not shown, in which it is engaged an end of the blade <NUM>.

The blade holder <NUM> has an appendix from which extends a shaft <NUM> which develops parallel to the longitudinal development direction of the blades <NUM>. The axis of the shaft <NUM> defines the rotation axis X-X of each blade <NUM>. A terminal end of the shaft <NUM> holds a support wheel <NUM> (<FIG>, <FIG>, <FIG>) engaged in a track <NUM> defined by one of the profiles forming the second beam 3b. Each of the two second beams 3b has a respective track <NUM> which develops parallel to second beam 3b and houses the rotation shafts <NUM> of the blades <NUM>. The rotation shafts <NUM> are configured to slide along the respective track <NUM> and to rotate about the rotation axis X-X. Therefore, each blade <NUM> can translate along the tracks <NUM> and with respect to the second beams 3b and rotate about the respective rotation axis X-X.

A rotation mechanism is mounted on each of the two second beams 3b and is operatively coupled to the blades <NUM> to determine the rotation of the blades <NUM> about the respective rotation axes X-X. A translation device is mounted on each of the two second beams 3b, is operatively coupled to the blades <NUM> and is configured to determine the translation of the shafts <NUM> and thus of the blades <NUM> along the tracks <NUM>.

The rotation mechanism is configured to rotate the blades <NUM> between the closed configuration and the open configuration. The translation device is configured to move the blades <NUM> between the open configuration and the packed configuration. The translation device comprises a belt <NUM> wrapped on two pulleys <NUM> placed at opposite ends of the respective second beam 3b (<FIG> and <FIG>). One of the pulleys <NUM> is connected to a main motor, not shown and connected to the octagonal pulley of <FIG>, configured to make it rotate. The rotation of the motorized pulley <NUM>, in one direction or the opposite, determines a translation of an upper branch of the belt <NUM>, in one direction or the opposite. For example, a single main motor is connected to the pulleys <NUM> coaxial to each other of the two transmission mechanisms to jointly move the two belts <NUM>.

As it can be seen from figures, each blade <NUM> is preceded and followed by two other blades <NUM>, apart from the blade <NUM> closest to the first beam 3a and the end blade <NUM> furthest away from the first beam 3a.

A carriage <NUM> is constrained to the shaft <NUM> of the end blade <NUM> so that the shaft <NUM> can rotate with respect to the carriage <NUM>. The carriage <NUM> is also integrally connected to a zone of the upper branch of the belt <NUM> so as to translate together with said upper branch. The upper branch of the belt <NUM>, when the belt <NUM> is moved by the main motor, drags with itself the carriage <NUM> by translating it along a direction coinciding with the upper branch and parallel to respective track <NUM>.

The shaft <NUM> of the end blade <NUM> is connected to the shaft <NUM> of the blade <NUM> which precedes via a cable <NUM> (<FIG>, <FIG>, <FIG>, <FIG>, <FIG>). The shaft <NUM> of each of the remaining blades <NUM> is connected to the shaft of the blade <NUM> which precedes and to the shaft <NUM> of the blade <NUM> which follows via a cable <NUM>. The shaft <NUM> of the blade <NUM> closest to the first beam 3a is fixed, meaning that it can rotate but cannot translate, or is connected to the first beam 3a via a cable <NUM> so as to translate for a limited stroke.

Thus, starting from the packed configuration of <FIG>, the rotation of the pulleys <NUM>, caused by the main motor, clockwise determines the translation of the upper branch of the belt <NUM>, of the carriage <NUM> and of the end blade <NUM> to the right. The carriage <NUM> drags, one after the other, to the right the remaining blades <NUM> (except possibly the blade <NUM> closest to the first beam 3a) which are constrained to each other by the cables <NUM>, until they are brought into the open configuration of <FIG> and <FIG>.

Starting from the open configuration of <FIG>, the rotation of the pulleys <NUM>, caused by the main motor, counterclockwise determines the translation of the upper branch of the belt <NUM>, of the carriage <NUM> and of the end blade <NUM> to the left. The end blade <NUM> goes to lie against the adjacent blade <NUM> and so the blades <NUM> pack back into the configuration of <FIG>.

In order to ensure the precision and fluidity of such translation movements, the carriage <NUM> comprises a blocking element <NUM> which engages the carriage <NUM> and is configured to prevent the rotation i.e. the misalignment, also limited, of said carriage <NUM> with respect to the track <NUM> and to the beam <NUM> during the translation parallel to track <NUM> and thus prevent the deformation of the belt <NUM>.

This blocking element <NUM> can, for example, engage the carriage <NUM> and a fixed part of the beam <NUM>.

In the non-limiting embodiment shown in <FIG> and <FIG>, the blocking element <NUM> comprises a fork element which extends towards the remaining blades <NUM> and engages the shaft <NUM> of at least one of said remaining blades <NUM> whatever the position of said blades <NUM> is. The fork element comprises two tines <NUM> which extend parallel to the respective track <NUM> and the shaft <NUM> or the shafts <NUM> is/are inserted between the two tines <NUM>. When the blades <NUM> are in the packed configuration, as in <FIG>, the fork element engages a plurality of said shafts <NUM>. When the blades <NUM> are in the open or closed configuration, as in <FIG>, the fork element engages one of said shafts <NUM>, the one of the adjacent blade <NUM>.

The rotation mechanism comprises a guide rail <NUM> (<FIG>, <FIG>, <FIG>, <FIG> and <FIG>) defined by an elongated plate which extends along the respective beam <NUM> and has an upper edge or support edge <NUM> having a plurality of seats <NUM> defined by recesses obtained in said support edge <NUM>. The guide rail <NUM> is movable along an actuation direction parallel to respective track <NUM> and to the respective beam <NUM>. For this purpose, the guide <NUM> is positioned in a longitudinal housing obtained in the beam <NUM> and is connected to an actuator to move it along the actuation direction.

In the shown embodiment (<FIG>), the actuator comprises a pair of springs <NUM> configured to pull the guide rail <NUM> towards a side (second position, towards left in <FIG>) and an auxiliary motor configured to pull the guide rail towards the opposite side (first position, towards right in <FIG>). The auxiliary motor, not shown in the attached figures, can be an electric motor connected via an auxiliary cable <NUM> to an end of the guide rail <NUM>, as in <FIG>, or a linear actuator or otherwise. In variant embodiments, the spring pushes the guide rail <NUM> instead of pulling it, and the auxiliary motor pushes the guide rail <NUM> instead of pulling it.

The seats <NUM> are as many as the blades <NUM> and are equally distanced between them. Each seat <NUM> has a circular arc bottom and is connected to straight portions of the support edge <NUM> via a curved connection and an edge.

The guide rail <NUM> has also a plurality of elongated slots <NUM>, each associated to a seat <NUM> and interposed between two successive seats <NUM>.

The rotation mechanism comprises an auxiliary guide <NUM> (<FIG>) which lies flanked by the guide rail <NUM> and is fixed in the beam <NUM>. In not shown variant embodiments, also the auxiliary guide <NUM> can be movable. The auxiliary guide <NUM> is composed by a plurality of elements which together form an auxiliary support edge <NUM> defined by an upper edge of the plurality of elements. In a not shown variant, the auxiliary guide <NUM> can be defined by a single elongated element.

The auxiliary support edge <NUM> has a plurality of recesses <NUM> equally distanced between them, in number equal to the number of the seats <NUM>, i.e. as many as the blades <NUM>. The recesses <NUM> are recesses obtained on the auxiliary support edge <NUM> of the auxiliary guide <NUM>. Each of the recesses <NUM> has a longitudinal extension, i.e. measured along the longitudinal extension of the auxiliary guide <NUM> (parallel to the track <NUM> and to the beam <NUM>), greater than a longitudinal extension of each seat <NUM>. Each recess <NUM> has a substantially flat bottom and is connected to rectilinear portions of the auxiliary support edge <NUM> via a concave connection and a rectilinear and inclined ramp.

The auxiliary guide <NUM> comprises furthermore a plurality of pins <NUM>, each one associated to a recess <NUM> and interposed between two successive recesses <NUM>. Each pin <NUM> protrudes laterally from the auxiliary guide <NUM> and is inserted in a respective elongated slot <NUM> of the guide rail <NUM> which lies alongside the auxiliary guide <NUM> (<FIG>, <FIG>, <FIG>) so as to slide inside the respective elongated slot <NUM>. The mutual position of the guide rail <NUM> and of the auxiliary guide <NUM> is such that in the first position of the guide rail <NUM> (guide rail <NUM> shifted all the way to the right, <FIG>), the seats <NUM> and the recesses <NUM> are mutually offset so that the rectilinear portions of the support edge <NUM> and the rectilinear portions of the auxiliary support edge <NUM> together form a continuous straight and horizontal surface, i.e. parallel to respective track <NUM>. On the other hand, in the second position of the guide rail <NUM> (guide rail <NUM> shifted all the way to the left, <FIG>), the seats <NUM> and the recesses <NUM> are at least partially mutually aligned, i.e. each of the seats <NUM> is positioned at one of the recesses <NUM> so that the aforementioned continuous, straight and horizontal surface is interrupted by the seats <NUM>.

The rotation mechanism comprises a plurality of arms <NUM>, each of which is integral with a respective shaft <NUM> and orthogonal to the shaft <NUM> itself. Each arm <NUM> has a distal end having a guiding roller <NUM> and an auxiliary guiding roller <NUM> lying close together and mounted so as to rotate freely on a side of the arm <NUM> and of an anti-stall roller <NUM> mounted so as to rotate freely on an opposite side of the arm <NUM> (<FIG>, <FIG> and <FIG>). The guiding roller <NUM>, the auxiliary guiding roller <NUM> and the anti-stall roller <NUM> are rotatable about a common axis. In variant embodiments, instead of the guiding <NUM>, <NUM> and/or anti-stall rollers <NUM> there can be sliders.

The guiding roller <NUM> lies and rolls against the support edge <NUM> of the guide rail <NUM>. The auxiliary guiding roller <NUM> lies and rolls against the auxiliary support edge <NUM> of the auxiliary guide <NUM>. Furthermore, a diameter of the guiding rollers <NUM> is slightly lower than a width of the seats <NUM>.

The rotation mechanism comprises a bar <NUM> which extends parallel to respective beam and to the respective track <NUM> and is defined by a profile with a substantially C-section. A longitudinal recess bonded by the C-section of the bar <NUM> is directed towards the arms <NUM>. Within the longitudinal recess are housed the anti-stall rollers <NUM> of the arms <NUM> of the blades <NUM> (<FIG>, <FIG> and <FIG>).

The bar <NUM> is movable along a direction orthogonal with respect to the track <NUM> between a first position and a second position of said bar <NUM> and, during this movement, the bar <NUM> remains parallel to itself and thus to the track <NUM> and to the beam <NUM>.

As shown in the attached <FIG>, a pair of anti-stall springs <NUM> have each one an end constrained to a lower portion of the bar <NUM> and an opposite end constrained to a lower wall of the beam <NUM>. The anti-stall springs <NUM> are therefore configured to pull the bar <NUM> downwards, i.e. towards the second position. In not shown variant embodiments, the springs can be positioned so as to push the bar <NUM> downwards or, instead of the springs, other types of anti-stall actuators are present. The bar <NUM>, the anti-stall springs <NUM> and the anti-stall rollers <NUM> form together an anti-stall device.

In the variant embodiment of <FIG>, are furthermore provided for spacers <NUM> arranged between guiding rollers <NUM> and auxiliary guiding rollers <NUM> of successive arms <NUM> or arranged between anti-stall rollers <NUM> of successive arms <NUM> (within the bar <NUM>) and configured to keep the blades <NUM> spaced apart also when they are in the packed configuration.

The functioning of the cover structure <NUM> according to the invention is described below.

In the packed configuration of <FIG> or of <FIG>, the blades <NUM> are inclined, lie close together and arranged near one of the first beams 3a of the support structure <NUM>. The auxiliary motor holds the guide rail <NUM> in the first position in contrast to the action exerted by the springs <NUM> (<FIG>). The guiding rollers <NUM> lie on the rectilinear portions of the support edge <NUM> of the guide rail <NUM> and the auxiliary guiding rollers <NUM> lie on the rectilinear portions of the auxiliary support edge <NUM> of the auxiliary guide <NUM>. Such supports prevent the rotation of the blades <NUM> and prevent the anti-stall springs <NUM> from moving the bar <NUM> from the first position, wherein the bar <NUM> is, towards the second position (<FIG>). In such a situation, the anti-stall rollers <NUM> lie against an inner upper surface of the bar <NUM>.

Whereas, the auxiliary motor holds the guide rail <NUM> in the first position as described above, the main motor is operated which drags towards left the end blade <NUM> and gradually the other blades <NUM> while said blades <NUM> are kept in their inclined position until they reach the open configuration of <FIG> and <FIG>. During such translation, the blades <NUM> do not rotate and cannot rotate, because the guiding rollers <NUM> lie on the rectilinear portions of the support edge <NUM> of the guide rail <NUM> and the auxiliary guiding rollers <NUM> lie on the rectilinear portions of the auxiliary support edge <NUM>. Also when the guiding rollers <NUM> contact the seats <NUM>, they cannot enter them, because the auxiliary guiding rollers <NUM> lie on the respective straight portions of the auxiliary support edge <NUM>.

Once the translation of the blades <NUM> has ended, the auxiliary motor is commanded or deactivated so that the pair of springs <NUM> is able to pull the guide rail <NUM> towards the second position of the guide rail <NUM> itself. Each of the seats <NUM> is brought at one of the guiding rollers <NUM> and of a recess <NUM>, such that the guiding roller <NUM> can enter the respective seat <NUM>, since the auxiliary guiding roller <NUM> no longer lies against the respective straight portion of the auxiliary support edge <NUM> (<FIG> and <FIG>) and the blade <NUM> can rotate. The anti-stall springs <NUM> help the inlet of the guiding rollers <NUM> into the seats <NUM> and thus the rotation of the blades <NUM>, because they pull the bar <NUM> and the anti-stall rollers <NUM> positioned within it downwards, i.e. towards the second position of the bar <NUM>. In this step, the anti-stall rollers <NUM> lie against a lower inner surface of the bar <NUM>.

This action exerted by the anti-stall bar <NUM> is particularly useful if, in the open configuration of <FIG> and <FIG>, the center of gravity G of each blade <NUM> (shown in <FIG>, <FIG> and <FIG>) is, with respect to a vertical direction passing through the rotation axis X-X of the blade itself <NUM>, on an opposite side with respect to the respective arm <NUM>, so that the weight of the blade <NUM> generates an angular momentum which opposes to the rotation of the blade <NUM> towards the closing position. The anti-stall device is configured to generate, with respect to the rotation axis X-X, an angular momentum, opposed to the angular momentum generated by the weight of the blade <NUM>, which drags said end inside the seats <NUM> and causes or favours the rotation of the blades <NUM> towards the closing position.

The rotation continues until the closed configuration (<FIG> and <FIG>), in which each guiding roller <NUM> lies at the bottom of the respective seat <NUM>. In this configuration, the center of gravity of each blade <NUM> is such as to generate an angular momentum which keeps the blade <NUM> itself closed configuration.

In order to bring the blades <NUM> back from the closed configuration (<FIG> and <FIG>) to the open configuration (<FIG> and <FIG>), the auxiliary motor is actuated to pull the guide rail <NUM> from the second position towards the first position by overcoming the elastic force exerted by the pair of springs <NUM>. The force of the auxiliary motor must be such as to drag the guide rail <NUM> and the guide rail rollers <NUM>, rolling the guide rail rollers <NUM> on the curved connection and outside the seats <NUM> and also to lift the bar <NUM>, overcoming the elastic force of the anti-stall springs <NUM>.

Claim 1:
Cover structure, comprising:
a support structure comprising at least two parallel and mutually spaced beams (3b);
a roof (<NUM>) mounted on the support structure and comprising a plurality of blades (<NUM>) which are parallel to each other and movable at least between a closed configuration, in which major edges (<NUM>, <NUM>) of the blades (<NUM>) lie mutually close together or overlapping and the blades (<NUM>) lie flat on the support structure, and an open configuration, in which each blade (<NUM>) is inclined to delimit openings between successive blades (<NUM>); each blade (<NUM>) comprising two rotation shafts (<NUM>), each coupled to a respective beam (3b), to allow the blade (<NUM>) to rotate about a rotation axis (X-X);
a rotation mechanism mounted on at least one of the two beams (3b) and operatively coupled to the blades (<NUM>), wherein said rotation mechanism is configured to determine the rotation of the blades (<NUM>);
wherein the rotation mechanism comprises:
a guide rail (<NUM>) extending along the respective beam (3b) and having a support edge (<NUM>) having a plurality of seats (<NUM>); wherein the guide rail (<NUM>) is movable along an actuation direction parallel to the respective beam (3b);
an arm (<NUM>) for each blade (<NUM>), extending transversally from the shaft (<NUM>) and having one end coupled to the support edge (<NUM>);
an actuator operatively coupled to the guide rail (<NUM>) to move said guide rail (<NUM>) along the actuation direction so as to cause the ends of the arms (<NUM>) to enter or exit the seats (<NUM>) and the blades (<NUM>) to rotate accordingly;
wherein the rotation mechanism is characterized in that it comprises an anti-stall device coupled to the ends of the arms (<NUM>) and configured to drag said ends into the seats (<NUM>) when said seats (<NUM>) are brought at the ends of the arms (<NUM>) by the movement of the guide rail (<NUM>) operated by the actuator;
wherein the anti-stall device comprises: a bar (<NUM>) engaged with the ends of the arms (<NUM>); and an anti-stall actuator coupled to the bar (<NUM>) and configured to move the bar (<NUM>) between a first position and a second position, wherein in the second position the ends of the arms (<NUM>) are on a bottom of the seats (<NUM>).