Automated opening system

Abstract

Title: Automated Opening System The invention relates to an opening system comprising: a frame (2); an opening (3) movable in translation relative to the frame (2); a translational guidance device for the opening (3), characterized in that the guidance device includes a guide integral with the opening and having: a first portion perpendicular to a direction of translation of the opening (3), a second portion parallel to the direction of translation of the opening (3); the guidance device also including: a connecting rod rotatably mounted on the frame (2); return means interposed between the frame (2) and the connecting rod. Figure for the abstract: Fig. 1

Description

Title of the invention: Automated opening system

[0001] Domain of the invention The field of invention is that of the design and manufacture of opening systems.

[0002] More specifically, the invention relates to an opening system that facilitates the movement of an opening relative to a frame.

[0003] Prior art Opening mechanisms are used in many technical fields, such as drawers (which form openings) that move relative to a frame, or boxes that consist of a body and a lid that move relative to the body, with the body forming the frame and the lid the opening. A particular type of box is a compact, portable box, such as a briefcase.

[0004] For many years, a trend towards the simplification of objects has been observed, both in terms of aesthetics and functionality.

[0005] For this purpose, protruding and / or unsightly parts of the objects are now hidden in order to make the lines of the objects smoother.

[0006] As an example, the handles of the openings are increasingly hidden or removed.

[0007] Indeed, some handles can simply be removed. The opening is then operated by an action that pushes the opening towards the inside of the frame so that, by spring effect, it pops out and offers a grip to the user.

[0008] Another type of opening includes handles that are retractable relative to the opening. In this case, the handles are retracted into a housing and are flush with the outer surface of the opening when it is not intended to be operated, and are extended from the housing when the opening needs to be operated by the user.

[0009] In the case of briefcases, it is common to replace the classically known opening means, which offer easy gripping of the opening, with motorized, and generally tactile, means, which are invisible or almost invisible when the opening is not being handled or is not intended to be.

[0010] This presents a major drawback in that the opening, which is then motorized, requires a source of energy, so the briefcase must be recharged from time to time to allow the opening of the flap.

[0011] To overcome this need for reloading, certain systems such as springs or elastic return means have been put in place to allow the opening to- automatic openings.

[0012] As explained previously, such systems require the user to press on the opening in a direction opposite to its opening, so as to disengage the retaining means in a closed opening position.

[0013] By releasing the pressure exerted, the opening then moves in its opening direction.

[0014] Subsequently, the user can, in a conventional manner, take hold of the opening to manipulate it as he wishes.

[0015] Such systems then require an action by the user on the opening which is not natural since, in order to open the opening, it is necessary to perform an action classically done to close the opening.

[0016] On the other hand, these recall devices are generally bulky and take up a significant amount of space which encroaches on storage space.

[0017] In addition, to avoid an excessively abrupt movement of the opening, shock absorbers are generally used in addition to the means enabling the opening.

[0018] Such dampers make it possible to slow down or moderate the speed of translation of the opening relative to the frame.

[0019] These shock absorbers also have a disadvantage in terms of size since they also occupy space in the storage volume.

[0020] Objectives of the invention The invention aims in particular to overcome the drawbacks of the prior art.

[0021] More specifically, the invention aims to provide an opening system that facilitates the opening or movement of the opening over a first portion of its total movement in an automatic manner.

[0022] The invention also aims to provide such an opening system that allows for smooth translational movement, that is, at a constant or nearly constant speed of the opening relative to the frame. More precisely, the objective is to achieve movement of the opening by a constant force, which then generates a constant acceleration for a given mass of the opening.

[0023] The invention further aims to provide such an opening system which is compact and allows for optimized storage space compared to opening systems according to the prior art.

[0024] Description of the invention These objectives, as well as others that will appear later, are achieved thanks to the invention which relates to an opening system comprising: - a frame; - a movable opening that translates relative to the frame, according to a total displacement between an open position in which the opening is away from the frame

[0025]

[0026]

[0027]

[0028]

[0029]

[0030] and a closing position; - a device for guiding the translation of the opening, characterized in that the guidance device includes a guide fixed to the frame and featuring: - a first portion extending perpendicularly to a direction of translation of the opening, - a second portion extending the first portion and forming an angle between 65° and 85° with the first portion; the guiding device also including a connecting rod having a first end cooperating with the guide, and a second end by which the connecting rod is rotationally mounted on the opening, and return means interposed between the opening and the connecting rod, the return means being able to adopt: - an active configuration in which the return means exert a force on the connecting rod to rotate it relative to the frame and allow the opening to move through a first part of its total displacement by cooperation between the first end of the connecting rod and the first portion of the guide, and - a neutral configuration in which the return means do not exert any force on the connecting rod, during the movement of the opening over a second part of its total movement, the first end of the connecting rod being guided on the second portion of the guide in the neutral position of the return means. Such an opening system allows the translational movement of the opening to be guided along a first part of its total movement so that the rest of the movement is controlled by the user himself. Indeed, the use of the guide with two distinct portions allows this partial guidance to be achieved by ensuring movement of the opening thanks to the return means and the connecting rod for the first part, while maintaining constant cooperation between the connecting rod and the guide on each part of the movement of the opening. Therefore, when the opening is repositioned in its closed position, the cooperation between the connecting rod and the guide is still effective in order to reset the guiding device to allow for new guidance during a future opening of the opening. In other words, this opening system is reusable and primed each time the opening is closed. According to an advantageous aspect, the return means are secured to the opening by means of a support attached to the opening, the support having at least two attachment positions for the return means. The two attachment positions of the rappel devices on the support allow for adjust the intensity of the force applied to the connecting rod by the return means between, at a minimum, a low intensity and a high intensity corresponding to each of the positions.

[0031] Of course, these two positions can be extreme positions, so that any intermediate position allows for finer adjustment of the force applied by the return means on the connecting rod and therefore for adjusting the speed of movement of the opening on the first part of its total movement.

[0032] By finely adjusting the force relative to the weight of the opening, it is possible to minimize acceleration and thus artificially render the speed constant or nearly so. The constant speed is a visual perception effect for the user.

[0033] According to another advantageous aspect, the support includes at least two pins forming the two hooking positions.

[0034] These pins can thus offer predetermined settings of the force applied by the return means on the connecting rod.

[0035] Thus, according to the user's wish, adjusting the position of the attachment of the return means on the support will allow the acceleration of the opening movement to be varied over its first part of total movement.

[0036] According to another advantageous aspect, the guide is mounted movably on the frame.

[0037] The mobility of the guide on the frame allows the cooperation stroke of the first section of the guide with the connecting rod.

[0038] Thus, the movement of the opening automatically by the cooperation between the guide and the connecting rod can be adjusted according to the user's wish.

[0039] According to another advantageous aspect, the connecting rod has a body integrating the first end and the second end, and a finger extending from the body and to which the return means are attached, the body and the finger being coplanar.

[0040] Such a connecting rod can, for example, be made by cutting a metal plate or by forming a flat plastic part.

[0041] The compactness of the opening system, and in particular of the connecting rod, makes it possible to increase the space available for the storage or arrangement of objects inside the drawer or box.

[0042] According to another advantageous aspect, the opening carries an adjustable stop intended to limit the rotation of the connecting rod relative to the opening.

[0043] Adjusting the stop then allows the rotation of the connecting rod relative to the opening to be reduced or increased, which has the effect of modifying the movement of the opening relative to the frame by the cooperation between the connecting rod and the first portion of the guide.

[0044] This adjustable stop can be an alternative to the mobility of the guide on the frame, offering increased simplicity in adjusting the limitation of the rotation of the connecting rod relative to the opening.

[0045] According to another advantageous aspect, the return means include at least one helical spring.

[0046] Such a helical spring is simple to manufacture, simple to calibrate, and highly resistant to repeated stresses, in particular the opening and closing of the opening.

[0047] Thus, the reliability of the opening system is improved.

[0048] According to another advantageous aspect, the helical spring is calibrated to exert a force of at least between 10N and 40N.

[0049] Such an effort applied by the spring means on the connecting rod makes it possible to obtain a smooth movement of the opening relative to the frame, that is to say a measured movement which does not risk surprising the user with an excessive speed.

[0050] In addition, a measured displacement of the opening makes it possible to reduce the noise caused by the opening when it is opened.

[0051] The ease of use of the opening system is thus improved.

[0052] According to another advantageous aspect, the opening system includes means for guiding the opening in translation relative to the frame.

[0053] The means for guiding the opening in translation relative to the frame make it possible to facilitate the translational movement of the opening relative to the frame until the opening can be manipulated or, at the very least, grasped by the user.

[0054] This makes it possible in particular to embed the opening in a housing of the frame, so that the opening and the frame are flush, which benefits the aesthetics of the whole in particular, without risk of the opening being braced during its translation.

[0055] According to another advantageous aspect, the translational guidance means comprise at least one rail and a trolley movable on the rail, one of the trolley and the rail being fixed to the opening and the other of the rail and the trolley being fixed to the frame.

[0056] A rail and trolley system provides good guidance reliability and also good compactness to the opening system according to the invention.

[0057] Figures Other features and advantages of the invention will become more apparent upon reading the invention, given by way of illustrative and non-limiting example, and the accompanying drawings, among which are:

[0058] [Fig. 1] is a top perspective view of a box incorporating a system opening according to the invention, the opening system having a frame and an opening movable relative to the frame, the frame being the body of the box and the opening being the lid of the box, the opening being represented in a closed position;

[0059] [Fig.2] is a top perspective view of the box according to [Fig.1], in which the opening is shown in an open position;

[0060] [Fig.3] is a top perspective view of a box according to [Fig.1], in in which the opening is represented in a pivoted position;

[0061] [Fig.4] is a schematic view showing the opening system according to the invention, in the closed position of the opening;

[0062] [Fig.5] is a schematic detail view of the opening system according to the invention, in the closed position of the opening, corresponding to [Fig.4];

[0063] [Fig.6] is a schematic detail view of the opening system according to the invention, in an intermediate opening position of the opening;

[0064] [Fig.7] is a schematic detail view of the opening system according to the invention, in the opening position of the opening as shown in [Fig.2];

[0065] [Fig.8] is a schematic detail view of the opening system according to the invention, illustrating part of a device for guiding the opening in translation relative to the frame.

[0066] Detailed description of the invention Figures 1 to 8 illustrate an opening system comprising: - a frame 2; - a movable opening 3 in translation relative to the frame 2 according to a total displacement between an opening position (illustrated by [Fig.3]) in which the opening 3 is moved away from the frame 2, and a closing position (illustrated by [Fig.1]); - a guide device 4 for the translation of the opening 3.

[0067] Between its open position and its closed position, the opening 3 can adopt an intermediate open position illustrated by [Fig. 2]. In this intermediate open position, or ajar position, the opening 3 is parallel to its closed position but is slightly away from the frame 2.

[0068] The opening position is defined as a pivoted position of the opening relative to the frame, this pivoted position being possible only if the opening has previously been brought into the intermediate opening position (otherwise, the opening is embedded in the frame and it is not possible to pivot it).

[0069] With reference to figures 1 to 3, the opening system is integrated into a box 1 comprising a body and a lid.

[0070] More specifically, the frame 2 corresponds to the body of the box 1, and the opening 3 corresponds to the lid of the box 1. Said box can for example be a briefcase.

[0071] The opening 3 includes in particular a flat element 31 and a pair of arms 32 by which the flat element 31 is connected to the frame 2.

[0072] With reference to figures 1 to 3, the opening 3 is mobile relative to the frame 2 according to two distinct movements.

[0073] According to a first movement, illustrating the passage of the lid of box 1 from its From its position on [Fig. 1] (closed position) to its position on [Fig. 2] (opening position), the opening 3 is mobile according to a translational movement. In this first movement, the planar element 31 and the pair of arms 32 have no relative movement.

[0074] According to a second movement, illustrating the transition of the lid from its partially open position shown in [Fig. 2] (open position) to its position shown in [Fig. 3] (pivoted position), the opening 3 is rotationally mobile relative to the frame 2. More specifically, the flat element 31 pivots relative to the pair of arms 32, which remain stationary relative to the frame 2. The pivoting is achieved by means of a pivot joint P and a guide finger 33 that follows a groove 34 presented by the arm 32. Each arm 32 has a groove 34 and a pivot joint P, and the opening 3 carries two guide fingers 33.

[0075] As will be explained later, the first movement corresponds to a total displacement of the opening 3 between its closed position illustrated by [Fig.1], and its open position illustrated by [Fig.2].

[0076] This first movement is broken down into a first part during which the movement of the opening 3 is carried out by the opening system, and a second part during which the movement of the opening 3 is carried out manually by a user of the opening system.

[0077] By way of illustrative and non-limiting example, the opening moves in translation over a total stroke of 12 mm. The first part of the total displacement is, for example, 11 mm and the second part of the total displacement is then 1 mm.

[0078] The opening system, and more particularly the guide device 4 in translation of the opening 3, illustrated in figures 4, 5, 6 and 7, makes it possible to achieve translational guidance of the opening 3 relative to the frame 2, automatically and without effort for a user during the first part of its total movement.

[0079] This translational guidance device 4 comprises: - a guide 5 that is integral to building 2; - a connecting rod 6 mounted movably to rotate on the opening 3; - return means 7 interposed between the connecting rod 6 and the opening 3.

[0080] More specifically, as illustrated in Figures 4, 5, 6 and 7, the guide 5 attached to the frame 2 presents: - a first portion 51, extending perpendicularly to a direction of translation of the opening 3, - a second portion 52, extending the first portion 51 and forming an angle between 65° and 85° with the first portion 51.

[0081] The connecting rod 6 is mounted for rotation on the arm 32.

[0082] According to the embodiment illustrated in Figures 4 to 7, the angle formed between the The first portion 51 and the second portion 52 is 70°.

[0083] The first portion 51 and the second portion 52 of the guide 5 are connected to each other by a third curved portion 53.

[0084] The third portion allows the guide device 4 to be reset when the opening 3 moves from its open position to its closed position, in order to allow the opening 3 to move from its closed position to its open position automatically.

[0085] The guide 5 is advantageously mounted movably on the frame 2.

[0086] This allows in particular to offset the second part 52 of the guide 5 relative to the connecting rod 6 in order to change the automatic translation distance of the opening 3.

[0087] In other words, by moving the guide 5 on the frame 2, the first part 51 is lengthened or shortened relative to the pivot point 67 of the connecting rod 6 on the opening 3. This adjustment directly affects the automatic translation height of the opening 3, that is, when the connecting rod 6 cooperates with the first part 51 of the guide 5.

[0088] As an alternative to the mobility of the guide 5, the guide device 4 can integrate an adjustable stop 66 intended to limit the rotation of the connecting rod 6 relative to the opening 3, and more precisely relative to the arm 32.

[0089] For this purpose, as illustrated in [Fig. 8], the adjusting stop 66 has a frustoconical portion designed to cooperate with the connecting rod 6 to limit its rotation

[0090] The adjustable stop 66 is fixed to the arm 32 by a helical cooperation, that is to say it is screwed onto the arm 32.

[0091] Screwing or unscrewing the adjustable stop 66 relative to the arm 32 then causes an advance or a retreat of the frustoconical portion, which respectively reduces or increases the angular stroke on which the connecting rod 6 can pivot.

[0092] Although the adjustable stop 66 is a variant of the mobility of the guide 5 relative to the frame 2, it is possible that the guide 5 is mobile on the frame 2 and that the guiding device 4 also incorporates an adjustable stop 66. Thus, it is possible to play on two adjustment parameters.

[0093] The box 1 has two guide devices 4 positioned opposite each other and located on either side of the flat element 31. As described previously, each guide device 4 comprises a connecting rod 6 mounted for rotation on an arm 32 of the opening 3, a guide 5 fixed to the frame and return means 7 interposed between the arm 32 of the opening 3 and the connecting rod 6.

[0094] Each guide device 4 acts between one of the arms 32 of the opening 3 and the frame 2.

[0095] This makes it possible in particular to ensure identical guidance on both sides of the opening 3, to prevent it from buckling, which would limit, or even prevent, its opening.

[0096] With reference to figures 4, 5, 6 and 7, the connecting rod 6 of the translational guide device 4 of the opening 3 has a first end 61 cooperating with the guide 5, and a second end 62 by which the connecting rod 6 is mounted for rotation on the opening 3, and more specifically on one of the arms 32.

[0097] As illustrated in figures 4 to 6, the contact between the connecting rod 6 and the guide 5 is achieved by means of a bearing 611 attached to the first end of the connecting rod and sliding on the guide 5.

[0098] More specifically, the connecting rod 6 has a body 63 incorporating the first end 61 and the second end 62, and a finger 64 extending from the body and to which the return means 7 are attached. The body 63 and the finger 64 are preferably coplanar.

[0099] In other words, the body 63 and the finger 64 extend in the same plane, the connecting rod 6 is thus preferably made in a thin layer.

[0100] By thin layer, it is understood that the length and width of the connecting rod 6 are much greater than the thickness of the connecting rod 6.

[0101] In other words, the body 63 and the finger 64, or in other words the connecting rod 6, is for example made by machining a block of metallic material, by cutting a sheet of metal, or made of plastic material and is relatively flat.

[0102] With reference to figures 4 to 7, the return means 7 comprise at least one helical spring 71, and in this case, a single helical spring 71.

[0103] The helical spring 71 is made of a metallic material such as steel, or stainless steel for example.

[0104] This helical spring 71 is calibrated to exert a force of at least between 10N and 40N.

[0105] As described below, the helical spring 71 of the return means 7 is fixed on one side to the opening 3 and on the other side to the connecting rod 6, and more particularly to an attachment point 65 of the return means 7 on the connecting rod 6, located on the finger 64 of the connecting rod 6.

[0106] As illustrated in figures 4 to 7, the helical spring 71 of the return means 7 is secured to the opening 3 by means of a support 9 having at least two hooking positions, namely a first hooking position and a second hooking position.

[0107] The first attachment position and the second attachment position thus define thresholds of force applicable by the return means 7 on the connecting rod 6.

[0108] The first position and the second position generate, as explained below, a maximum force Fl and a minimum force F2 applied by the return means 7 on the connecting rod 6.

[0109] The support 9 thus includes two pins 91 which define the first hooking position and the second hooking position 91 as illustrated in [Fig.5].

[0110] The helical spring 71 of the return means 7 then includes a hook intended to cooperate with one of the pins 91.

[0111] The opening system also includes means for guiding the opening 3 relative to the frame 2 in translation 11.

[0112] More particularly, the translational guidance means 11 are applied between the arms 32 attached to the opening 3 and the frame 2.

[0113] The translational guidance means 11 comprise at least one rail 12 and a carriage 13 movably mounted on the rail 12.

[0114] More particularly, the translational guidance means 11 comprise two rails 12 and two trolleys 13 each movable in translation on a rail 12.

[0115] One of the rail 12 and the carriage 13 is mounted integrally with the opening 3 (and more particularly with the arms 32), while the other of the carriage 13 and the rail 12 is mounted integrally with the frame 2.

[0116] More specifically, as schematically illustrated in Figures 4, 5, 6 and 7, each rail 12 is integral with the frame 2 and each carriage 13 is integral with an arm 32 of the opening 3.

[0117] During the translation movement of the opening 3 and more particularly of the arms 32, the rails 12 and the carriages 13 ensure perfect translation of the arms 32 and avoid any risk of the opening 3 jamming during its translation.

[0118] The translational movement of the opening 3 is thus ensured.

[0119] In operation, the opening 3 is therefore moved automatically and guided in its translational movement along at least a first part of its total movement.

[0120] Thanks to the return means 7, the translational guidance of the opening 3 is made possible since the return means 7 can adopt: - an active configuration in which the return means 7 exert a force on the connecting rod 6 to rotate it relative to the opening 3 and allow the opening 3 to move through a first part of its total displacement, and - a neutral configuration in which the reaction of the connecting rod on the guide 5 decreases sharply over the portion 52 and is therefore no longer sufficient to ensure the translational movement of the opening; indeed, the second portion 52 almost completely neutralizes the force perpendicular to the first portion 51, because the counter-reaction force remains normal (perpendicular) to the point of contact of the bearing 611 on the second portion 52. In other words, the spring still exerts a force on the connecting rod, but the connecting rod no longer transmits this force perpendicularly to the frame, this force being almost parallel to the building (according to the angle of the slope of 52).

[0121] As a consequence of the force exerted by the return means 7 on the connecting rod 6, the latter acts on the frame 2 by cooperation between the first end 61 of the connecting rod 6 (and more precisely the bearing 611) and the first portion 51 of the guide 5 as illustrated by figures 6 and 7. Here the value Fl of the force of the bearing 611 at the point of contact and perpendicular to the first portion 51 is maximum and proportional to the force exerted by the spring 71.

[0122] For the movement of the opening 3 over a second part of its total translational movement, the first end 61 of the connecting rod 6 (and more precisely the bearing 611) is guided on the second portion 52 of the guide 5, when the return means 7 are in their neutral position.

[0123] In other words, during the movement of the opening 3 over the second part of its total movement, the return means 7 do not influence, or hardly at all (never, nothing, nobody), the translation of the opening 3. Thus, the value F2 of the force perpendicular with the first portion 51, at the level of the bearing 611 is minimal, or even zero or almost zero.

[0124] To activate the automatic raising or movement of the opening 3, the user acts on a switch 14, a push button or a touch area of ​​the frame 2 as illustrated by [Fig. 1].

[0125] This action unlocks a locking system in the closed position of the opening 3 (not shown in the figures), the opening 3 then being able to move in translation relative to the frame 2.

[0126] When the opening 3 is free to translate, the return means 7 which are in their active configuration exert their effort until they recover their neutral configuration.

[0127] The helical spring 71 of the return means 7 acts on the connecting rod 6 to pivot the latter relative to the opening 3, so that the first end 61 of the connecting rod 6 follows a circular trajectory relative to the opening 3 (and more precisely to the arm 32 on which it is rotationally mounted), thus causing, through cooperation with the first portion 51 of the guide 5, the translation of the arm 32 and therefore of the opening 3 along the first part of its total displacement. This displacement then tends to move the opening 3 away from the guide 5, and therefore from the frame 2.

[0128] When the connecting rod 6 has traveled the first portion 51 of the guide 5, the return means 7 are in a neutral position and exert no more or almost no forces on the connecting rod 6.

[0129] The user can then grasp the opening 3 and complete the translational movement over its total displacement, the first end 61 of the connecting rod 6 then cooperating with the second portion 52 of the guide 5 without exerting any force on the guide 5 and therefore on the frame 2.

[0130] The movement of the opening 3 and the arms 32 is then not hindered by the connecting rod 6 of the guide device 4 in translation of the opening 3.

[0131] The opening system according to the invention, and more particularly the guide device 4 in translation of the opening 3 which has just been described, has many advantages.

[0132] Firstly, this guide device 4 allows for an automatic opening on a first part of the translation of the opening 3, in a smooth and constant speed manner, which reinforces a qualitative aspect of the opening system.

[0133] Secondly, this guidance device 4 is simple to operate, which allows for quick and easy maintenance.

[0134] Thirdly, this guide device 4 is also compact and therefore allows for a more substantial storage space in the body of the box 1 (i.e. in the frame 2) than according to the prior art.

[0135] Finally, this guidance device 4 is inexpensive and easy to manufacture and install.

[0136] It is important to understand that in an opening system according to the invention, which has two guide devices 4, the guide devices 4 may be identical, as shown in Figures 4 to 7, to optimize manufacturing costs, or symmetrical to optimize their placement within the opening system. In other words, the guide device 4 should be interpreted broadly, which notably includes opening systems with more than two guide devices 4, two of which are located substantially at opposite ends of the opening.

[0137] In alternative embodiments, any means of return can be used to obtain the desired function, in particular leaf springs, an elastic return element, made of elastomer for example or any other means of return known to those skilled in the art.

Claims

Demands

1. Opening system comprising: - a building (2); - a movable opening (3) in translation relative to the frame (2), according to a total displacement between an opening position in which the opening (3) is moved away from the frame (2) and a closing position; - a guiding device (4) for the translation of the opening (3), characterized in that the guiding device (4) includes a guide (5) integral with the frame (2) and having: - a first portion (51) extending perpendicularly to a direction of translation of the opening (3), - a second portion (52) extending the first portion (51) and forming an angle between 65° and 85° with the first portion (51); the guiding device (4) also including a connecting rod (6) having a first end (61) cooperating with the guide (5), and a second end (62) by which the connecting rod (6) is rotationally mounted on the opening (3), and return means (7) interposed between the opening (3) and the connecting rod (6), the return means (7) being able to adopt: - an active configuration in which the return means (7) exert a force on the connecting rod (6) to rotate it relative to the opening (3) and allow the opening (3) to move through a first part of its total displacement by cooperation between the first end (61) of the connecting rod (6) and the first portion (51) of the guide (5), and - a neutral configuration in which the return means (7) do not exert any force on the connecting rod (6), during the movement of the opening (3) over a second part of its total movement, the first end (61) of the connecting rod (6) being guided on the second portion (52) of the guide (5) in the neutral position of the return means (7).

2. Opening system according to claim 1, characterized in that the return means (7) are secured to the opening (2) by means of a support (9) which is integral with the opening (3), the support (9) having at least two attachment positions for the return means (7).

3. Opening system according to claim 2, characterized in that the support (9) comprises at least two pins (91) forming the two hooking positions.

4. Opening system according to any one of the preceding claims, characterized in that the guide (5) is movablely mounted on the frame (2).

5. Opening system according to any one of the preceding claims, characterized in that the connecting rod (6) has a body (63) incorporating the first end (61) and the second end (62), and a finger (64) extending from the body (63) and to which the return means (7) are attached, the body (63) and the finger (64) being coplanar.

6. Opening system according to any one of the preceding claims, characterized in that the opening (3) carries an adjustable stop (66) intended to limit the rotation of the connecting rod (6) relative to the opening (3).

7. Opening system according to any one of the preceding claims, characterized in that the return means (7) comprise at least one helical spring (71).

8. Opening system according to claim 7, characterized in that the helical spring (71) is calibrated to exert a force of at least between ION and 40N.

9. Opening system according to any one of the preceding claims, characterized in that it comprises means for guiding (11) in translation of the opening (3) relative to the frame (2).

10. Opening system according to claim 9, characterized in that the translational guiding means (11) comprise at least one rail (12) and a carriage (13) movable on the rail (12), one of the carriage (13) and the rail (12) being integral with the opening (3) and the other of the rail (12) and the carriage (13) being integral with the frame (2).

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