FR3025856A1 - MULTI-PURPOSE PROFILE, MANUFACTURING MECHANISM USING SAID PROFILE AND GREEN WITH SUCH A MECHANISM FOR ACTUATING THE AERATION OPENERS. - Google Patents

Abstract

The profile (10) comprises a longitudinal groove (11) of which P is the plane of symmetry, said groove being delimited, on the one hand, by a longitudinal bottom wall (111) extended by two longitudinal side walls (110), said bottom wall being perpendicular to the geometric plane P, the profile comprising a longitudinal return (120) extends each side wall to the plane P, the returns (120) that has said profile are spaced from each other, each return ( 120) has, facing the other, a longitudinal lip (121), the two said lips (121) defining in combination with each other, a longitudinal opening, each longitudinal lip is extended by a first longitudinal flank (122), parallel to the bottom wall, this first side is extended at right angles to a geometric plane P1 containing the extrados face of the bottom wall, by a second side (130). the profile (10) may serve in particular as a transverse reinforcement of a greenhouse. It is then possible to slide in the groove (11) of the profile (10) an actuating bar and an operating carriage of an actuating mechanism remote from an air opening.

Description

1 MULTI-PURPOSE PROFILE, MANUFACTURING MECHANISM USING SAID PROFILE AND GREEN WITH SUCH A MECHANISM FOR ACTUATING THE AERATION OPENERS. Technical area.

The present invention is in the field of profiled materials made by rolling, extrusion or folding, and more particularly relates to a profile for multiple applications. State of the art Metal or plastic profiles such as so-called plastic materials are obtained by forming materials in the form of sheets, by folding, extruding, rolling or cold drawing. These profiles are used for various types of applications. Certain profiles are used in particular to provide translation guidance in the implementation of slides. These slides generally include a stationary member, providing a sliding track or rolling track to a movable member for translating relative to the fixed member. Profiles are also known for stiffening structures in the building or mechanical construction sector. The disadvantage of the existing profiles lies in the fact that each existing section 20 meets a need that is unique to it. Therefore, it is necessary to use as many different profiles as there are applications to achieve. The present invention aims to provide a profile for the realization of multiple applications. More particularly, in one embodiment, the profile according to the invention is intended to form, in combination with an operating carriage, a mechanism for actuating a remote element. This mechanism is particularly used in the field of culture tunnel greenhouses for the actuation of ventilation openings. It is known that the tunnel greenhouses each consist of a metal frame intended to be covered by a synthetic cover tarpaulin generally transparent to light. The framework of the greenhouses is commonly constituted by a plurality of regularly spaced amounts, supporting a roof structure formed of arches joined to each other by side rails and ridge. Furthermore, the amounts are joined by 3025856 2 transverse bars and longitudinal reinforcing bracing. The purpose of the covering tarpaulin is to protect crops from bad weather but also to create a so-called greenhouse effect which causes a rise in temperature in the greenhouse by which plants in the cold season are protected from frost. . Usually the greenhouse roof is provided with a plurality of opening operable in the direction of opening and closing. By opening of the openings are created in the roof of the greenhouse vents allowing ventilation of the internal volume of the greenhouse and a lowering of the temperature of said volume in hot period. In this way it is possible to a certain extent to regulate the temperature in the greenhouse. It also becomes possible with these openings to regulate the ventilation in the greenhouse and sometimes the brightness. These openings are formed of a frame articulated to the roof ridge of the greenhouse and a cover sheet attached to said frame.

Typically these openings are operated in the sense of opening and closing by mechanical actuation systems operable from the internal volume of the greenhouse by control means located at man's height. These control means are constituted by cranks when the mechanical actuation systems are manually operable or by electrical contactors when the mechanical actuation systems incorporate electric motors. Generally, these mechanical actuation systems each consist of a housing fixed to the corresponding transverse bar of the framework of the greenhouse, this housing being provided with a through guide channel receiving a rack driven in translation by pinion fixed to the output shaft of a mechanically or electrically actuated gearbox mounted in the housing. The rack receives fastening at each of its ends opening bars of the greenhouse. These actuating rods are guided in translation along the transverse bar by guide means each formed by a mount provided with a collar for attachment to the transverse bar, said frame carrying a pair of upper and lower rollers defining both a guide channel in which is engaged the corresponding actuating bar. These bars actuate the associated openings 3025856 3 by means of actuating rods. Each actuating rod is secured by one of its two ends, possibly by means of a ball joint or equivalent to the corresponding actuating bar and by its other end, possibly via a seal ball joint or 5 equivalent to the frame of the corresponding opening. The actuating rods are secured to the actuating rods between two guide means. The implementation of these mechanical actuation systems because of the means adopted for guiding the actuating bars, without being complex in itself, is a tedious implementation.

Furthermore, the movement of the opening elements actuated by the mechanical system as described is limited by the distance between two consecutive guide means. This is due to the fact that each actuating rod is secured to the actuating bar between two guide means. The distance between these two guide means could be increased, but such an arrangement proves in practice to be relevant because of the risk of the actuator bar flexing considerably under the effect of the force applied by the control rods. At the structural level, significant internal stresses may appear on the rack because it is not guided in translation. In effect, the rack is subjected to tensile and compressive forces during the actuation of the opening, the stresses due to buckling are then important insofar as no element of the mechanical actuation system absorbs or limits these efforts. The life of the rack is then reduced.

Such mechanical actuation systems lend themselves little to the simultaneous actuation of the openings of a multi-tunnel greenhouse. For this reason each tunnel of the greenhouse is equipped with its own mechanical actuation systems. This results in a multiplication of the cost of the equipment and the assembly time of the greenhouses according to the number of greenhouse chapel to be installed. Presentation of the invention. The present invention aims to remedy all or part of these disadvantages.

To this end, the present invention aims, in a first aspect, a profile comprising a longitudinal geometric plane of symmetry P, a longitudinal groove whose plane P is the plane of symmetry, said groove being delimited, on the one hand, by a longitudinal bottom wall extended by two longitudinal side walls, said bottom wall being perpendicular to the geometric plane P, and extending symmetrically with respect to said plane P, and the side walls being symmetrically formed with respect to said P plane, is essentially characterized in that a longitudinal return extends each side wall to the plane P, and returns that said profile 10 are spaced apart from each other, and are capable of forming two coplanar longitudinal stops , that each return has, facing the other, a longitudinal lip capable of forming guide track, the two said lips defining in combination the one with the other, a longitudinal opening, that each longitudinal lip is extended by a first longitudinal flank, parallel to the bottom wall 15 and extending above and spaced from the corresponding return, that this first flank is extended to right angle towards a geometric plane P1 containing the extrados face of the bottom wall, by a second flank. According to another characteristic of the invention, the second sidewall, beyond said plane P1, is extended at right angles by a third flank (14) forming a support flange. With these provisions, the profile can be used to achieve a plurality of applications. The present invention also relates to a mechanism for actuating a remote element implementing a rack for actuating an actuating bar of said remote element, characterized in that it implements a profile according to FIG. invention said bar being slidably mounted in the groove of the profile, and being secured to a maneuvering carriage by one of its ends. The present invention also relates to a culture greenhouse 30 having a frame formed of lateral uprights provided for supporting a roof frame to be covered by a cover tarpaulin, transverse frames being interposed horizontally between each upright, said greenhouse being provided with opening operable in openings and closures by actuating mechanisms characterized in that each leaf is actuated by an actuating mechanism according to the invention. Brief presentation of figures and drawings. Other advantages, objects and features of the present invention will appear on reading the description of at least one preferred embodiment, given by way of non-limiting example with reference to the appended drawings, in which: FIGS. 1, 2 and 3 are diagrammatic views of the straight sections of the profile according to a plurality of embodiments; FIG. 4 is a diagrammatic perspective view of the actuating mechanism comprising the profile, FIG. 5 is a sectional view of the actuating mechanism comprising the profile, - figure 6 is a perspective view of an operating carriage, - figures 7 and 8 are perspective views of two abutting profiles, - figure 9 is a perspective view. a culture greenhouse with the actuating mechanism. DESCRIPTION OF AN EMBODIMENT OF THE INVENTION As shown in FIGS. 1, 2 and 3, the profile 10 according to the invention can be made by folding a metal sheet or else by extrusion. This profile comprises a longitudinal geometric plane of symmetry (P), forming a plane of symmetry of a longitudinal groove 11. The groove 11 is delimited, on the one hand, by a longitudinal bottom wall 111, extended by two longitudinal side walls 110 The bottom wall 111 is perpendicular to the geometrical plane P, and extends symmetrically with respect to said plane P, and the side walls are symmetrically formed with respect to said plane P. Preferably, a longitudinal return 120 extends each side wall to the plane P, and returns that said profile is spaced apart from each other, and are able to form two longitudinal stoppers 120 coplanar.

Each return 120 has, facing the other, a longitudinal lip 121 adapted to form guide track, the two said lips being parallel and delimiting in combination with each other, a longitudinal opening. Each longitudinal lip 121 is extended by a first longitudinal flank 3025856 6 122, parallel to the bottom wall and extending above and spaced from the corresponding return. Each first flank 122 is extended at a right angle towards a geometrical plane P1 containing the extrados face of the bottom wall 111, by a second flank 130. In the preferred embodiment, each second flank 130, beyond of said plane P1 is extended at right angles by a third flank 14 forming a support wing. Preferably, the two returns 120 are symmetrical to each other 10 along the plane P. The first longitudinal flank 122 is extended by a longitudinal lip 123, able to form a guide track, each said lip being extended by the second Sidewall 130. According to the preferred embodiment, the two pairs of lips 121 and 123 are of different diameters. Each of the longitudinal lateral walls 110, in combination with the second adjacent flank 130 and with the corresponding flank 122, forms a lateral groove 13 contiguous to the groove 11, the bottom of which consists of said first flank 122.

For use in a humid environment, the profile is provided with through-holes 131 for the removal of standing water. Thus, through holes 131 of circular shape are formed in the second flanks 130, at regular intervals along the longitudinal geometric axis of the profile 10. These holes forming pairs, one of the holes is adjacent to the third flanks 14, and of which the other is made along the longitudinal median axis of the second flanks 130. The first flanks 122 are also provided with circular through holes 125 formed at regular intervals along the longitudinal axis of the profile 10.

The junction zone between each longitudinal side wall 110 and the adjoining abutment 120 is provided with through bores 126 at regular intervals along the longitudinal geometric axis of the section 10.

The third flanks 14 are provided with circular through holes 140 and square through holes 141, distributed at regular intervals along the longitudinal axis of the profile 10. As shown in FIG. 1, each of the flanks 14 extends to the outside is extended by a fourth lateral flank 142 developing perpendicularly and beyond the plane P1. According to an alternative embodiment of the profile 10, shown in FIG. 3, each third flank 14 always extends outwards and has a curvature 143 of arcuate circular cross-section whose convexity is directed towards the outside. the plane P1. The junction zone between the circular arc 143 and the lateral flank 142 has through holes 144 at regular intervals along the longitudinal axis of the profile 10. According to another embodiment shown in FIG. 2, the two wings of FIG. support 14 are oriented towards the plane P and meet to give the profile a tubular character. These two wings are advantageously welded to one another according to their longitudinal free edge. FIG. 4 shows an actuating mechanism 20 of a remote element implementing an operating rack 21 of an actuating bar 22 of said remote element. This actuating mechanism 20 implements a profile 10 according to the first embodiment as shown in FIG. 1. This profile is fixed to the framework of the greenhouse so as to be horizontal and so that the support wings be vertical. The bar 22 is slidably mounted in the groove 11 of the profile 10, 25 and is connected to an operating carriage 23 at one of its ends, said carriage 23 being guided by said profile. The rack 21 is kinematically linked to a drive member 24 and is fixedly connected by at least one of its ends to the end of an actuating bar 22. Preferably, the drive member 24 is a geared motor of the type shown in FIG. irreversible because of the reduction ratio, and each end of the rack is connected to a drawbar, so that, during operation of the geared motor, one of the bar is pulled and the other is pushed, and conversely, according to the direction of movement of the rack. The drive member 24 is fixed in any known manner, preferably to a mechanical junction piece providing the rigid junction between two profiles according to Figure 1, these two sections being held by this connecting piece in coaxial relationship. The rack is slidably mounted in each of these two sections and carries at each end a guide roller 301, grooved, engaged in the corresponding section, the roller 301 by its groove is engaged between the two guide lips 121 and comes resting on the lower guide lip 121. The outer diameter of this roller is greater than the width of the longitudinal opening defined by the two support lips while the diameter of this roller measured at the bottom of the groove is less than at said width. According to the preferred embodiment, the roller 301, by its axis is mounted in an attachment in a frame formed of two parallel plates facing each other. These two plates are fixed on the one hand to the corresponding end of the rack and to the corresponding end of the associated actuating bar 22. Each actuating bar is slidably mounted in the groove 11 of the profile which receives it. In this way this bar is confined in the profile and maintained by the latter. The operating carriage 23 is slidably mounted in the groove 11 of the profile and comprises rolling members, not shown in the figures. These rolling members are intended to guide the operating carriage in translation along the longitudinal axis of the profile 10. As shown in Figures 5 and 6, the operating carriage is formed of a support plate 28, intended to carry in a movable manner in rotation the rolling members. Preferably, the support plate 28 is interposed 25 between two actuating rods 22, and is fixed rigidly to the corresponding ends of these rods 22. Therefore, the maneuvering trolley 23 allows the end-to-end connection of two actuating rods 22. , and thereby allows the transmission of the axial mechanical forces of traction or thrust of a bar 22 to another.

The operating carriage 23 also includes anti-friction elements 25 and 26 in the form of plastic plates. These anti-friction elements are fixedly supported by the support plate 28.

As illustrated in FIGS. 5 and 6, the support 28 of the operating carriage 23 comprises a bottom wall 280, extended by two transverse side walls 281 developing in the same direction, so as to form a U. One of the side walls is extended by a transverse wall 282, parallel to the bottom wall, extending towards the outside of the U. By these arrangements, the support 28 of the operating carriage 23 is provided to cover the groove 11, the wall of the bottom 280 being parallel to the plane P1 and the transverse wall 282 of the support being directed upwards. The transverse wall 282 is provided with through-holes 283, 10 distributed along a longitudinal axis of said wall 282. Thus, said transverse wall 282 is able to carry rolling members, these members being intended to roll on one of the second sidewalls 130 of the profile 10. In an alternative embodiment, the bottom wall 280 comprises at least one running member rotatably mounted for rolling on one of the longitudinal side walls 110 of the profile 10. This or these rolling members can be used alone or in combination with the rolling members carried by the transverse wall 282. As shown in FIGS. 5 and 6, a first anti-friction plate 25 is fastened in parallel and at a distance from the bottom wall 280 of the support 28, between the two side walls 281 of the support. This first anti-friction plate is intended to slide in the groove 11 of the profile 10, vis-à-vis the stops 120 and parallel to the plane P1. A second antifriction plate 26 is attached to the bottom wall 280 between the two side walls 281 of the support 28. This second plate 26 is parallel to the first plate 25 and is provided to face the first flanks. 122 returns 120, so that these returns 120 are interposed between the first and second antifriction plate. The second antifriction plate 26 is, for example, interposed between the bar 22 and the bottom wall 280.

Preferably, two actuating rods 22 are fixed rigidly at one of their ends to the bottom wall 280 of a support 28 of an operating carriage 23, as shown in FIG. by means of fastening flanges engaged in through-holes 284 in the bottom wall 280 and in through-holes provided at each end of the actuating rods 22. Each actuating bar 22 is attached to each of the longitudinal ends of the operating carriage 23 preferably by flanges 29.

In the embodiment described, each flange 29 is U-shaped, the branches of the flange being housed in the through bores of the bar 22 and the bottom wall 280 and the ends of the legs being threaded to receive nuts. Clamping. In the preferred embodiment, the actuator bar 22 is provided with a longitudinal opening. According to the preferred embodiment, the cross section of the actuating bar 22 forms an arc of circular circumference whose two ends are bent inwards. Such a longitudinal opening arrangement and shape of revolution allows a lateral insertion of the bar in the groove 11 of the profile by simple pivoting movement which greatly facilitates both assembly operations and maintenance operations. In order to improve its sliding in the groove 11 of the profile 10 during its translation, the bar 22, over a portion of its length receives at least one anti-friction sheath 27. This sheath envelops the corresponding portion of the bar 22.

Such an arrangement also has the effect of greatly reducing the noise due to friction. As illustrated in FIG. 8, it may be necessary to abut two sections 10 together. In this view, an abutment element 40 is provided in order to position two axially aligned sections 10 in a fixed position.

In a preferred embodiment, the abutting element 40 is elongated and its cross-section is U-shaped. The abutment element 40 is then engaged by the parallel longitudinal side walls of the U in the grooves. side 13 of the two sections 10 to abut and the side walls are rigidly attached to the second side 130 of the two profiles 10 to butt.

The abutment element 40 is in association with a clamping plate 41 and clamping force distribution elements. The clamping plate 41 and the elements for distributing the clamping forces are positioned on either side of the profiles 10 to be abutted and clampably hold the abutting element to the two sections. Advantageously, the abutment elements may constitute the mechanical part of junction mentioned above, designed to receive in fixing 5 the drive member 24. In order to avoid bending phenomena of the cross section of the profiles 10, these profiles are provided with spacers of stiffening 42. The stiffening struts 42 are fixed between the two third sides 14 of the profile 10. For this purpose, each spacer 42 has a claw 43 at each of its ends. One of the claws is provided to engage in one of the square holes 141 of one of the two third flanks 14 and the other claw is provided to engage in one of the square holes of the other third flank. Preferably, the spacers are fixed along the profiles, at regular intervals, and each spacer is inclined relative to the longitudinal geometric axis of the profile, that is to say forms a non-right angle with said axis. In a preferred embodiment, the actuating mechanism drives, via an actuating link 51, a ventilation aperture 56 of the culture greenhouse 50 as shown in FIG. 9.

The culture greenhouse 50 has a frame formed of side posts 52 provided to support a roof frame 53 to be covered by a cover sheet (not shown in the figures). Transverse armatures 54 are interposed horizontally between each upright 52, at each of the longitudinal ends of the greenhouse. The transverse reinforcements 54 are formed by the actuating mechanism 20 described above. The greenhouse is preferably composed of a plurality of tunnels communicating with each other. In order to stiffen the structure of the greenhouse, spacers 55 are interposed between the roof frames 53 and the corresponding sections 10. The greenhouse 50 comprises at least one ventilation aperture 56 hinged to the roof frame 53 by means of an actuating rod 51 interposed between said at least one opening and the operating carriage 23 of the locking mechanism. actuation 20. The air opening 56 consists of a frame 560 covered with a cover tarpaulin, pivoting along a geometric axis parallel to the longitudinal geometric axis 5 of the greenhouse. The rod 51 is rotatably assembled to the distal portion of the frame 560 at one of its ends and to the transverse wall 282 of the support 28 of the operating carriage 23 at the other end. The ventilation opening 56 is able to occupy a first position, in which it is open, and a second position, in which it is closed. Due to the irreversibility of the motor member 24 it can occupy intermediate positions between its two extreme positions. Preferably, when the culture greenhouses comprise several tunnels, a single maneuvering rack 21, kinematically linked to the motor member 24, drives the maneuvering carriages 23 of the actuating mechanisms 20 of several tunnels making up the greenhouse. It goes without saying that the present invention can receive any arrangements and variants of the field of technical equivalents without departing from the scope of this patent as defined by the claims below. 20

Claims (39)

REVENDICATIONS1. Profile (10) comprising a longitudinal geometric plane of symmetry (P), a longitudinal groove (11) whose plane P is the plane of symmetry, said groove being delimited, on the one hand, by a longitudinal bottom wall (111) extended by two longitudinal side walls (110), said bottom wall being perpendicular to the geometrical plane P, and extending symmetrically with respect to said plane P, and the side walls being symmetrically formed with respect to said plane P, characterized in that a longitudinal return (120) extends each side wall towards the plane P, and that the returns (120) that presents said profile are spaced from one another, and are able to form two coplanar longitudinal stops, each return (120) has, facing the other, a longitudinal lip (121) adapted to form a guide track, the two said lips (121) delimiting in combination with each other, a longitudinal opening, that e each longitudinal lip is extended by a first longitudinal flank (122), parallel to the bottom wall and extending above and spaced from the corresponding return, that the first flank is extended at right angles to a plane geometric P1 containing the extrados face of the bottom wall, by a second flank (130). 2. Profile (10) according to claim 1, wherein the second side, beyond said plane P1, is extended at right angles by a third flank (14) supporting wing. 3. Profile (10) according to claim 1, wherein the two returns (120) are symmetrical to each other along the plane P. 4. Profile (10) according to claim 1, wherein each first longitudinal flank (122) is extended by a longitudinal lip (123), adapted to form a guide track, each said lip being extended by the second side (130). . 5. Profile (10) according to the preceding claim, wherein the two pairs of lips (121, 123) are of different diameters. 6. Profile (10) according to claim 1, wherein each of the longitudinal side walls (110), in combination with the second adjacent flank (130), forms a lateral groove (13) adjacent to the groove (11), the bottom is constituted by the first flank (122). 3025856 14 7. Profile (10) according to claim 2, wherein circular through holes (131) are formed in the second flanks (130) at regular intervals along the longitudinal geometric axis of the profile (10), these holes forming pairs, one of the holes is adjacent to the third flanks (14), and the other is formed along the longitudinal median axis of the second flanks. 8. Profile (10) according to the preceding claim, wherein each third sidewall (14) is provided with circular through holes (140) at regular intervals along the longitudinal axis of the profile (10). 10 9. Profile (10) according to the preceding claim, wherein each third sidewall (14) is provided with through holes of square shape (141) at regular intervals along the longitudinal axis of the profile (10). 10. Profile (10) according to the preceding claim, wherein the first flanks (122) are provided with through holes (125) of circular shape, at regular intervals along the longitudinal axis of the profile (10). 11. Profile (10) according to claim 2, wherein each third flank (14) is extended by a fourth lateral flank (142) developing perpendicular to the plane P1, beyond said plane P1. 12. Profile (10) according to claim 1, wherein the junction zone 20 between each longitudinal side wall (110) and the adjoining stop (120) is provided with through holes (126) at regular intervals along the longitudinal geometric axis. of the profile (10). The profile (10) of claim 2, wherein each third flank (14) has an arcuate arc-shaped bend (143) directed to the P1 plane. 14. Profile (10) according to the preceding claim, wherein the junction zone between the arc (143) and the side flank (142) has through holes (144) at regular intervals along the longitudinal axis of the profile. (10). 15. Profile according to any one of the preceding claims, characterized in that the third flanks extend outwardly. 16. Profile (10) according to claim 2, wherein the third flanks or support flanges 14 are oriented towards the plane P and meet to give the profile a tubular character. 3025856 15 17. Mechanism for actuating (20) a remote element using a rack kinematically connected to a drive member (24), provided for the operation (21) of an actuating bar (22) of said remote element, characterized in that it implements a profile (10) according to any one of the preceding claims, said bar being slidably mounted in the groove (11) of the profile (10), and being assembled to a maneuvering trolley (23) at one of its ends which operating carriage (23) is slidably mounted in the groove (11) of the profile. 18. Actuating mechanism (20) of a remote element according to the preceding claim, wherein the rack (21) is fixedly connected by at least one of its ends to the end of an actuating bar. (22). 19. Actuating mechanism (20) of a remote element according to one of claims 17 or 18, wherein the operating carriage (23) comprises rolling members intended to guide the operating carriage in translation following the longitudinal axis of the profile (10), anti-friction elements (25, 26) in the form of plastic plates, a support plate (28) intended to carry the rolling members in a rotatable manner, and to bear fixedly the anti-friction elements, the support plate being fixedly connected to at least one actuating bar (22). 20. Actuating mechanism (20) of a remote element, according to the preceding claim, wherein the support (28) of the operating carriage (23) comprises a bottom wall (280), extended by two transverse lateral walls ( 281) developing in the same direction, so as to form a U, one of the side walls being extended by a transverse wall (282), parallel to the bottom wall, extending outwardly of the U. 21. actuating mechanism (20) of a remote element, according to claim 20, wherein the support (28) of the operating carriage (23) is provided to cover the groove (11), the bottom wall (280). ) being parallel to the plane P1 and the transverse wall (282) of the support being directed upwards. 22. actuating mechanism (20) of a remote element, according to claim 20, wherein the transverse wall (282) of the support (28) 3025856 16 comprises at least one running member rotatably mounted, for rolling on one of the second flanks (130) of the profile (10). 23. Actuating mechanism (20) of a remote element, according to claim 20, wherein the bottom wall (280) of the support (28) comprises at least one running member rotatably mounted for rolling on one of the longitudinal side walls (110) of the profile (10). 24. actuating mechanism (20) of a remote element, according to one of claims 19 to 21, wherein a first anti-friction plate (25) is fixed parallel and remote from the bottom wall (280) of the support (28), between the two side walls (281), this first antifriction plate being intended to slide in the groove (11) of the profile (10), vis-à-vis the stops (120) and parallel to the plane P1 . An actuating mechanism (20) of a remote member according to one of claims 19 to 21, wherein a second antifriction plate (26) is attached to the bottom wall (280) of the support (28). between the two side walls (281), this second plate being parallel to the first plate (25) and being provided to be opposite the first flanks (122) of the returns (120), so that the returns are interposed between the first and the second antifriction plate. 20 26. Actuating mechanism (20) of a remote element, according to one of claims 17 to 25, wherein an actuating bar (22) is rigidly fixed by one of its ends, to the wall of bottom (280) of the support (28) of the operating carriage (23). An actuating mechanism (20) of a remote member according to the preceding claim, wherein the second antifriction plate (26) is interposed between the bar (22) and the bottom wall (280). 28. Actuating mechanism (20) of a remote element according to claim 26 or claim 27, wherein the attachment of the actuating bar (22) to the bottom wall (280) of the support (28). is operated by a fastening flange (29). 29. actuating mechanism (20) of a remote element, according to one of claims 17 to 28 wherein the cross section of the actuating bar. (22) forms an arc of circle circumference, both ends of which are bent inwards. 30. Actuating mechanism (20) of a remote element according to one of claims 17 to 29, wherein at least one anti-friction sheath (27) 5 wraps the bar (22) over a portion of its length. 31. Actuating mechanism (20) of a remote element according to one of claims 17 to 30, wherein the actuating rack (21) is guided in translation by a guide member (301). 32. Actuating mechanism (20) of a remote element according to the preceding claim, in which the guide element (301) in translation of the rack (21) is formed by grooved roller both longitudinal lips ( 121) trapping the wheel and constituting a raceway, said wheel being integral with two parallel longiform plates situated respectively on each of its flanks, these two plates being fixedly joined to one end of the rack, by one of their ends, and being fixedly attached to one end of an actuating bar (22) by their second end. 33. An actuating mechanism (20) of a remote element according to any one of claims 17 to 32, wherein the abutment of two axially aligned sections (10) is formed by means of an element of butting (40). 34. An actuating mechanism (20) of a remote element according to the preceding claim, wherein the cross section of the abutting element (40) is U-shaped, the abutment element being engaged, by 25 the parallel side walls of the U, in the lateral grooves (13) of the two sections (10) to abut and said side walls being rigidly attached to the second sidewalls (130) of the two sections (10) to be abutted. 35. Actuating mechanism (20) of a remote element according to the preceding claim, wherein the abutting element (40) is in association with a clamping plate (41) and distribution elements of the stresses of clamping, the clamping plate and the clamping force distribution elements being positioned on either side of the profiles (10) and now clamping the abutting element the two sections (10). 3025856 18 36. Actuating mechanism (20) of a remote element according to any one of claims 17 to 35, wherein stiffening struts (42) are fixed between the two third sides (14) of the profile (10). 37. An actuating mechanism (20) of a remote element according to the preceding claim, wherein each spacer (42) has a claw (43) at each of its ends, one of the claws engaging in one of the square bores. (141) of one of the third flanks (14) of the profile (10) and the other claw engaging in one of the square holes of the other third flank. 38. An actuating mechanism (20) of a remote element according to any one of claims 17 to 37, wherein the actuated element is a ventilation aperture (56) of a greenhouse (50) said opening being actuated via an actuating rod (51) secured on the one hand to said opening and on the other hand to a guide carriage (23). 39. A culture greenhouse (50) having a frame formed of side posts (52) for supporting a roof frame (53) to be covered by a cover sheet, transverse frames (54) being horizontally interposed between each mounting, said greenhouse being provided with opening operable in openings and closures by actuating mechanisms characterized in that each leaf is actuated by an actuating mechanism according to any one of claims 17 to 38.