FR3088403A1 - In-line shutter having a shutter plate configured to be indexed in position - Google Patents

Abstract

The present invention relates to an in-line shutter (1) making it possible to produce a sealed shutter, and conversely, a fluid circulation in a pipe between an upstream pipe arranged upstream of said in-line shutter (1) in a direction of fluid flow and a pipe. downstream arranged downstream of said in-line shutter (1) in said direction of fluid flow. Furthermore, the in-line shutter (1) comprises at least one indexing member (13, 13 ') and a tracking member (16) offset laterally relative to said shutter plate (2) and being configured to follow the movements of said shutter plate (2) movable in the plane (P) between said shutter position and said circulation position.

Description

In-line shutter having a shutter plate configured to be indexed in position

The present invention relates to the field of installations for the production, treatment or transport of a fluid in at least one pipe. Such a fluid can in particular be a liquid, a gas, a product in pasty form or a product in the powder state.

More specifically, the invention relates to the field of in-line shutters comprising a shutter plate movable in a plane P and being intended to be mounted on such a pipe, for example for performing a maintenance operation on a member arranged downstream of this shutter online.

In known manner, such in-line shutters have in particular been described by the Applicant in the document FR 3 057 933. Such in-line shutters thus generally comprise a monolithic shutter plate made of metal capable of achieving a tight shutter or a fluid circulation in the pipeline. A follow-up member can be rigidly secured to the closure plate. This monitoring member is then arranged in a laterally offset manner relative to the shutter plate and may allow indexing in position of the shutter plate relative to a body of the shutter by means of a shutter member. indexing secured to the body.

However, such a rigid assembly between the closure plate and the monitoring member can prove to be problematic for carrying out an indexing in position which is simple and quick to implement manually by an operator actuating the closure plate. Indeed, such indexing in position can only be obtained by precisely positioning opposite an indexing finger of the indexing member with a bore of substantially complementary shape made in the monitoring member.

However, the shutter plate generally has a large clearance of operation relative to the body of the shutter. Thus, the guidance of the shutter plate and therefore also of the monitoring member integral with the shutter plate is imprecise with respect to the body of the shutter.

The object of the present invention is therefore to propose an on-line shutter making it possible to overcome the limitations mentioned above. Indeed, an object of the invention is to provide an optimal solution to allow indexing in simple and rapid position of a closure plate with a shutter body.

As already mentioned, the invention relates to an in-line shutter making it possible to produce a sealed shutter, and conversely, a fluid circulation in a pipe between an upstream pipe arranged upstream of the inline shutter in a direction of fluid flow and a pipe downstream arranged downstream of the in-line shutter in the direction of fluid flow, the in-line shutter comprising:

A movable closure plate in a plane P between a closure position stopping the fluid circulation and a circulation position allowing the fluid circulation, the closure plate comprising a solid portion for stopping the fluid circulation and an perforated portion for allow fluid circulation, • a body comprising an upstream half-body and a downstream half-body arranged respectively upstream and downstream of the closure plate, the upstream and downstream half-body being movable in translation relative to one another to the other perpendicular to the plane P, the upstream and downstream half-bodies respectively having an upstream orifice and a downstream orifice allowing fluid circulation between the upstream pipe and the downstream pipe, • an indexing member for indexing in position the shutter plate relative to the body in the closed position and alternately to index the position the shutter plate relative to the body in the closed position circulation, the indexing member comprising a frame and at least one movable indexing finger between two extreme positions relative to the frame, a first extreme position in which the indexing member indexes the closure plate in position by relative to the body and a second extreme position in which the indexing member gives freedom of movement to the closure plate relative to the body, • a tracking member, the tracking member being offset laterally relative to the closure plate, the monitoring member being configured to follow the displacements of the movable closure plate in the plane P between the closure position and the circulation position, the monitoring member comprising at least two suitable bores to cooperate respectively with the indexing finger arranged in the first extreme position relative to the frame, a first bore cooperating with the indexing finger when the closure plate is positioned in the position obturation and alternatively a second bore cooperating with the indexing finger when the obturation plate is positioned in the circulation position.

According to the invention, such an in-line shutter is remarkable in that it includes guide means configured to guide independently of the movements of the tracking member with respect to the body during the relative movements of the shutter plate with respect to to the body and in that the closure plate cooperates with the monitoring member according to a mechanical connection of the type having at least one degree of freedom.

In other words, thanks to the guide means, the guide of the tracking member with respect to the body can be dissociated from the guide of the closure plate with respect to the body. In addition, the tracking member then has a relative displacement capacity relative to the closure plate to allow possible variations in guidance between the tracking member and the guide plate.

In addition, the shutter plate and the tracking device can describe different types of movement relative to the shutter body. Such movements can for example be chosen from the group comprising the translational movements in the plane P and the rotational movements in the plane P.

Thus according to a first embodiment of the invention, the guide means can be configured to guide in translation the movements of the tracking member relative to the body.

According to this first exemplary embodiment, to carry out such guiding in translation, the guiding means may comprise bearings made of a material with a low coefficient of friction such as for example Polytetrafluoroethylene (PTFE) or also self-lubricating bronze. Such guide means may also include bearings or sockets having rolling elements with balls, rollers or needles making it possible to produce a frictionless bearing during relative translational movements between the tracking member and the body or any other part. united or attached to the body.

According to a second embodiment of the invention, the guide means can be configured to guide in rotation the movements of the tracking member relative to the body.

Similarly, according to this second example of embodiment for producing such guiding in rotation, the guiding means may comprise bearings made of a material with a low coefficient of friction such as, for example, Polytetrafluoroethylene (PTFE) or even self-lubricating bronze. Such guide means may also include bearings or bushings having rolling elements with balls, rollers or needles making it possible to produce a rolling without friction during relative rotational movements between the tracking member and the body or any other part. united or attached to the body.

Advantageously, the guide means can comprise at least one guide piece secured to the body, the guide piece (s) having an orifice through which the tracking member is able to move with a set of adapted guidance.

In other words, the orifice of the guide piece (s) and the monitoring member comprise complementary shapes making it possible to limit the degrees of freedom to a direction in translation corresponding to the first exemplary embodiment or to a rotating direction corresponding to the second embodiment.

Furthermore, according to a first variant of the invention, the indexing member can be secured to the guide piece (s).

Thus according to this first variant of the invention, the indexing member and the guide piece (s) are arranged in connection with the embedding type and have no degree of freedom, one with respect to the other.

According to a second variant of the invention, the shutter may comprise clamping / spacing means making it possible to tighten, and conversely, to separate the upstream and downstream half-bodies relative to the closure plate to allow clamping / relative spacing of the upstream and downstream half-bodies with respect to the closure plate, and the indexing member can be secured with a drawer arranged movable according to at least one degree of freedom in translation relative to the (or) guide piece (s), the slide being movable between a working position in which the indexing member is capable of indexing in position the closure plate relative to the body and a rest position in which the d indexing is not capable of indexing the closure plate in position relative to the body, the drawer comprising at least one hook configured to, in the working position, prevent manipulation of the clamping / spacing means and vice versa, in position rest, allow manipulation ulation of the clamping / spacing means.

According to this second variant of the invention, the indexing member and the drawer are arranged in connection of the embedding type and have no degree of freedom with respect to one another. The drawer and the guide piece (s) can, for their part, be arranged in a slide-type connection and have, in relation to each other, a degree of freedom in translation in a plane perpendicular to the plane. P.

In addition, according to this second variant of the invention, when the drawer is arranged in the working position, the clamping / spacing means cannot be actuated.

In addition, the indexing member can be advantageously actuated by means of a key inserted in a lock provided in the chassis of the indexing member. In this case, the presence of the key in the lock then makes it possible to arrange the indexing finger in the first extreme position relative to the chassis and the absence of the key in the lock then makes it possible to arrange the finger indexing in the second extreme position relative to the chassis.

Furthermore, the degree (s) of freedom of the mechanical connection between the closure plate and the monitoring member can be of different types and correspond to different embodiments of the invention such as described below.

Thus, according to a first embodiment of the invention, the degree (s) of freedom of the mechanical connection can be (one or more) degree (s) of freedom in translation.

In this first embodiment, the shutter plate and the tracking member can move relative to each other at least in translation in at least one direction inscribed in a plane perpendicular to the plane P.

According to a second embodiment of the invention, the degree (s) of freedom of the mechanical connection can be (a) degree (s) of freedom in rotation.

In this second embodiment, the shutter plate and the tracking member can then move relative to each other at least in rotation along an axis of rotation oriented in any direction.

According to a third embodiment of the invention, the closure plate can cooperate with the monitoring member according to a point-type mechanical connection having five degrees of freedom, two degrees of freedom in translation and three degrees of freedom in rotation .

In this third embodiment, the closure plate and the tracking member can then move relative to each other in translation in two perpendicular directions forming a plane perpendicular to the plane P and rotating along three axes. of rotation oriented perpendicularly to each other. Thus, a first axis of rotation can be arranged parallel to the plane P and the other two axes of rotation can be inscribed in a plane perpendicular to the plane P.

According to a fourth embodiment of the invention, the closure plate can cooperate with the monitoring member according to an elastic connection of the deformable type having six degrees of freedom, three degrees of freedom in translation and three degrees of freedom in rotation .

According to such a fourth embodiment, the closure plate and the tracking member can then move relative to each other in translation in three perpendicular directions and in rotation along three axes of rotation oriented perpendicularly. one to another. These three directions or axes of rotation thus comprise a first direction or first axis of rotation arranged parallel to the plane P and the other two directions or axes of rotation can be inscribed in a plane perpendicular to the plane P.

The invention and its advantages will appear in more detail in the context of the description which follows with examples given by way of illustration with reference to the appended figures which represent:

FIGS. 1 and 2, perspective views of an in-line shutter according to a first embodiment example according to the invention,

FIGS. 3 and 4, perspective views of another type of in-line shutter according to the first embodiment example according to the invention, and

- Figure 5, a front view of an in-line shutter according to a second embodiment according to the invention.

In addition, the elements present in several separate figures can be assigned a single reference.

As already mentioned, the invention relates to an in-line shutter making it possible to produce a tight shutter, and conversely, a fluid circulation in a pipe between an upstream pipe arranged upstream of the inline shutter in a direction of fluid flow and a downstream pipe arranged downstream of the shutter in line in the direction of fluid flow.

As shown in FIG. 1, the in-line shutter 1 comprises a shutter plate 2 movable in a plane P between a shutter position stopping the fluid circulation and a circulation position allowing the fluid circulation. Such a closure plate 2 then comprises a solid portion 3 to stop the fluidic circulation and an openwork portion 4 to allow the fluidic circulation in the pipeline.

Furthermore, the in-line shutter 1 also comprises a body 5 formed by an upstream half-body 6 and a downstream half-body 7 arranged respectively upstream and downstream of the closure plate 2. These upstream half-body and downstream 6 and 7 are then movable in translation relative to each other perpendicularly to the plane P. In addition, these upstream and downstream half-bodies 6 and 7 respectively have an upstream orifice 8 and a downstream orifice 9 making it possible to produce the fluid circulation between the upstream pipe and the downstream pipe.

In addition, such an in-line shutter 1 also comprises at least one indexing member 13, 13 'for indexing in position the shutter plate 2 relative to the body 5 in the shutter position and alternatively for indexing in position the closure plate 2 with respect to the body 5 in the circulation position.

Such an indexing member 13, 13 'then comprises a chassis 14, 14' and at least one indexing finger 15, 15 'movable between two extreme positions relative to the chassis 14, 14'. A first extreme position of the indexing finger 15, 15 ′ corresponds to a deployed position in which the indexing member 13, 13 ′ indexes the closure plate 2 in position relative to the body 5. A second extreme position of the indexing finger 15, 15 'corresponds to a retracted position in which the indexing member 13, 13' gives freedom of movement to the closure plate 2 relative to the body 5.

In addition, the in-line shutter 1 also includes a tracking member 16 offset laterally relative to the shutter plate 2. Such a tracking member 16 is thus configured to follow the movements of the shutter plate 2 movable in the plane P between the closed position and the circulation position. In addition, the tracking member 16 comprises at least two bores 17, 18 able to cooperate respectively with the indexing finger 15, 15 ’arranged in the first extreme position relative to the chassis 14, 14’.

Thus, a first bore 17 can cooperate with the indexing finger 15 of a first indexing member 13 when the closure plate 2 is positioned in the closure position and alternatively a second bore 18 can cooperate with the finger indexing 15 'of a second indexing member 13' when the closure plate 2 is positioned in the circulation position.

In addition as shown in FIG. 1, the in-line shutter 1 also includes guide means 20 configured to independently guide the movements of the tracking member 16 relative to the body 5 during the relative movements of the plate. obturation 2 relative to the body 5.

In addition, the shutter plate 2 can cooperate with the monitoring member 16 according to a mechanical connection of the type having at least one degree of freedom such as for example a connection of the flat support type having two degrees of freedom in translation in a plane P 'perpendicular to the plane P and a degree of freedom in rotation about an axis of rotation Oz perpendicular to the plane P'.

As shown in Figures 1 to 4 corresponding to a first embodiment of the invention, such guide means 20 are configured to guide in translation along the axis Oz the movements of the tracking member 16 relative to the body 5.

Furthermore, the guide means 20 comprise at least one guide piece 23 secured to the body 5. Such a guide piece 23 thus has an orifice 24 through which the tracking member 16 can move with a guide clearance adapted. In this case, the in-line shutter 1 can then comprise two indexing members 13, 13 ’secured to the guide piece 23.

The use of two indexing members 13, 13 ′ may indeed be advantageous to allow inter-locking of the indexing in position of the closure plate 2 with clamping / spacing means 48 making it possible to clamp, and conversely, to separate the upstream and downstream half-bodies 6 and 7 relative to the closure plate 2 to allow relative tightening / spacing of the upstream and downstream half-bodies 6 and 7 relative to the closure plate 2 .

Such interlocking thus guarantees locking in position of the clamping / spacing means 48 as long as the shutter plate 2 is not arranged in the shutter position or alternatively in the circulation position.

By the terms key and lock used to describe such interlocking means is meant any type of key having a personal identification code such as a rigid mechanical part comprising for example at one end of the teeth, shapes or notches to activate a complementary bolt. However, the invention is not limited to this single embodiment, the terms key and lock can also denote a card or a support incorporating magnetic, electronic or electromagnetic bodies for storing an identification code. In this case, the complementary locks may each comprise a magnetic, electronic or electromagnetic reading device, respectively, for reading the information stored in the keys which are separate from one another.

As shown, the in-line shutter 1 can then be equipped with interlocking means making it possible to impose on an operator a shutter sequence to achieve the tight shutter of the pipe (s) and reverse sequence to open the pipe (s). Such interlocking means then comprise at least two keys and 47 distinct from one another and at least two sets of two locks 42, 43 and 45, 46 complementary.

In addition, the insertion of an additional key 50 into the first indexing member 13 makes it possible both to retract the indexing finger 15 inside the chassis 14 and to release the key 41 from the lock 42 d an interlocking member 40. An operator can extract the key 41 from the lock 42 and then place the key 41 in the lock 43 arranged at the clamping / spacing means 48. In this way, the clamping means / spacing 48 comprise the two keys 41 and 47 inserted respectively in the locks 43 and 46 and a steering wheel 49 can be operated by the operator to move the upstream and downstream half-bodies 6 and 7 relatively apart from one another.

As shown in FIG. 2, once the separation of the upstream and downstream half-bodies 6 and 7 has been achieved, the operator can then grasp the key 47 present in the lock 46 and place this key 47 in the lock 45 d ' another interlocking member 44. The insertion of this key 47 into the lock 45 then has the effect of retracting an indexing finger 15 inside a chassis 14 of the interlocking member. lock 44.

In this way, the operator takes out the indexing finger 15 from a bore 29 formed in the tracking member 16 and thus frees the tracking member 16 which can then be moved relative to the guide piece 23 The operator can then move the movable closure plate 2 in the plane P between the circulation position and the closure position.

Once the closure plate 2 has been moved, the operator can then re-enter the key 47 present in the lock 45 of the interlocking member 44 and replace this key 47 in the lock 46 of the means tightening / spacing 48. The withdrawal of the key 47 from the lock 45 causes the indexing finger 15 to exit towards the outside of the chassis 14 and cooperates with a bore 19 made in the monitoring member 16. Furthermore , the insertion of this key 47 into the lock 46 then has the effect of releasing the tightening / spacing means 48.

Then, the operator operates the flywheel 49 in the opposite direction to tighten the upstream and downstream half-bodies 6 and 7 again against the plate 2.

The operator can grasp the key 41 present in the lock 43 and place this key 41 in the lock 42 of the interlocking member 40. The insertion of this key 41 in the lock 42 then has the effect of releasing a key 51 of the second indexing member 13 '.

The operator can then enter the key 51 and extract it from the second indexing member 13 ’, which has the effect of deploying the indexing finger 15’ inside the second bore 18 arranged opposite.

In addition, depending on the key 50 or 51 free and not connected with the first or second indexing member 13 or 13 'an operator can know the state of closing or opening of such a shutter in line 1 and therefore the position of the closure plate 2 relative to the body 5.

Furthermore, as shown in FIG. 3, another type of in-line shutter 11 may in turn include another type of clamping / spacing means 10 making it possible to tighten, and conversely, to separate the upstream half-bodies and downstream 6 and 7 relative to a closure plate 12 to allow relative tightening / spacing of the upstream and downstream half-bodies 6 and 7 relative to the closure plate 12.

Furthermore, in this case, two indexing members 13, 13 ′ can be secured to a slide 35 arranged movable according to at least one degree of freedom in translation relative to a guide piece 33 of the guide means 30 secured to the body 5.

In addition, this drawer 35 is arranged movable between a working position in which the indexing members 13, 13 'are capable of indexing in position the closure plate 12 relative to the body 5 and a rest position in which the indexing members 13, 13 ′ cannot index the closure plate 12 in position relative to the body 5.

In addition, the drawer 35 has at least one hook 36 configured to, in the working position, prevent manipulation of the clamping / spacing means 10 by cooperating with a lever 37 and conversely, in the rest position, allow manipulation of the tightening / spacing 10 by releasing the lever 37.

In this case, the closure plate 12 can cooperate with the monitoring member 16 with pressure screws 38 and 39 allowing a point-type mechanical connection having five degrees of freedom, two degrees of freedom in translation in the plane P 'and three degrees of freedom in rotation along three axes perpendicular to each other, two axes Ox, Oy being inscribed in the plane P' and an axis Oz being perpendicular to the plane P '.

In addition, in FIG. 3, the closure plate 12 of the in-line shutter 11 is shown in a circulation position allowing fluid circulation. In this case, the key 51 is extracted from a lock 53 and allows the indexing finger 15 ′ to be arranged in a first extreme position by cooperating with a first bore 17 of the tracking member 16.

As shown in Figure 4, the shutter plate 12 of the in-line shutter 11 is arranged in a shutter position stopping the fluid circulation. In this case, the key 50 is extracted from a lock 52 and allows the indexing finger 15 to be arranged in a first extreme position by cooperating with a second bore 18 of the tracking member 16.

As previously in FIG. 1, as a function of the key 50 or 51 which is free and not connected with the first or second indexing member 13 or 13 ′, an operator can know in a certain and remote manner the closed state or opening such a shutter in line 11.

Furthermore, once the introduction of one of the keys 50 or 51 into one of the locks 52 or 53 has been carried out, the operator can then exert a force on the key considered 50 or 51, this force being oriented according to the direction of insertion of the key 50 or 51.

Such an effort exerted by the operator can then instantly cause the drawer 35 to move relative to a guide piece 33 and makes it possible to position the drawer 35 in the rest position.

In addition as shown in FIG. 5 corresponding to a second embodiment of the invention, the in-line shutter 21 may include guide means 30 configured to guide in rotation along an axis Oz ′ the movements of the member. tracking 26 relative to the body 25. In this case, the closure plate 22 is also movable in rotation relative to the body 25.

In addition, the closure plate 22 can for its part cooperate with the monitoring member 26 according to an elastic connection of the deformable type having six degrees of freedom, three degrees of freedom in translation along axes Ox ', Oy' and Oz 'and three degrees of freedom in rotation along the axes Ox', Oy 'and Oz'.

Such an elastic connection can for example be produced by means of a deformable member 27 arranged at at least one end of the tracking member 26. Such a deformable member 27 can for example be formed wholly or partly in a polymer material elastic comprising deformation capacities in translation and in rotation along the three axes Ox ', Oy' and Oz '.

Naturally, the present invention is subject to numerous variations in its implementation. Although several embodiments have been described, it is understood that it is not conceivable to identify exhaustively all the possible modes. It is of course conceivable to replace a means described by an equivalent means without departing from the scope of the present invention.

Claims (10)

1. In-line shutter (1, 11, 21) making it possible to produce a sealed shutter, and conversely, a fluid circulation in a pipe between an upstream pipe arranged upstream of said in-line shutter (1, 11, 21) in a direction of fluid flow and a downstream pipe arranged downstream of said in-line shutter (1, 11, 21) in said direction of fluid flow, said in-line shutter (1, 11, 21) comprising: • a closure plate (2, 12, 22) movable in a plane (P) between a closure position stopping said fluid circulation and a circulation position allowing said fluid circulation, said closure plate (2) comprising a solid portion (3) for stopping said fluid circulation and an openwork portion (4) for allowing said fluid circulation, • a body (5, 25) comprising an upstream half-body (6) and a downstream half-body (7) arranged respectively upstream and downstream of said closure plate (2, 12, 22), said upstream and downstream half-bodies (6 and 7) being movable in translation relative to each other perpendicularly to said plane (P), said upstream and downstream half-bodies (6 and 7) respectively having an upstream orifice (8) and a downstream orifice (9) allowing said fluid circulation between said upstream pipe and said downstream pipe, • an indexing member (13, 13 ') for indexing said closure plate (2, 12, 22) in position by relative to said body (5, 25) in said closed position and alternatively to index in position said closure plate (2, 12, 22) relative to said body (5, 25) in said circulation position, said member 'indexing (13, 13') comprising a frame (14, 14 ') and at least one indexing finger (15, 15') movable between two extreme positions relative to said frame (14, 14 '), a first position extremale in which said indexing member (13, 13 ') indexes in position said closure plate (2, 12, 22) relative to said body (5, 25) and a second extreme position in which said indexing member (13, 13 ') gives freedom of movement to said closure plate (2, 12, 22) relative to said body (5, 25), and • a monitoring member (16, 26), said tracking member (16, 26) being offset laterally with respect to said cover plate (2, 12, 22), said follow-up member (16, 26) being configured to follow the movements of said cover plate uration (2, 12, 22) movable in the plane (P) between said closed position and said circulation position, said tracking member (16, 26) comprising at least two bores (17, 18) capable of cooperating respectively with said index finger (15, 15 ') arranged in said first extreme position relative to said frame (14, 14'), a first bore (17) cooperating with said index finger (15, 15 ') when said shutter plate (2, 12, 22) is positioned in said shutter position and alternatively a second bore (18) cooperating with said indexing finger (15, 15 ') when said shutter plate (2, 12 , 22) is positioned in said circulation position, characterized in that said in-line shutter (1, 11, 21) comprises guide means (20, 30) configured to guide independently of the movements of said tracking member (16, 26 ) relative to said body (5, 25) during the relative displacements of said closure plate (2, 12, 22) by rapp ort said body (5, 25) and in that said closure plate (2, 12, 22) cooperates with said tracking member (16, 26) according to a mechanical connection of the type having at least one degree of freedom. 2. Shutter according to claim 1, characterized in that said guide means (20) are configured to guide in translation said movements of said tracking member (16) relative to said body (5). 3. Shutter according to claim 1, characterized in that said guide means (30) are configured to guide in rotation said movements of said tracking member (26) relative to said body (25). 4. Shutter according to any one of claims 1 to 3, characterized in that said guide means (20, 30) comprise at least one guide piece (23, 33) secured to said body (5), said at least a guide piece (23, 33) having an orifice (24, 34) through which said tracking member (16, 26) is able to move with a suitable guide clearance. 5. A shutter according to claim 4, characterized in that said indexing member (13, 13 ’) is secured to said at least one guide piece (23). 6. obturator according to claim 4, characterized in that said obturator comprises clamping / spacing means (10) making it possible to tighten, and conversely, to separate said upstream and downstream half-bodies (6 and 7) relative to said closure plate (12) to allow a relative tightening / spacing of said upstream and downstream half-bodies (6 and 7) relative to said closure plate (12), and in that said indexing member (13, 13 ') is secured to a drawer (35) arranged movable according to at least one degree of freedom in translation relative to said at least one guide piece (33), said drawer (35) being movable between a working position in which said indexing member (13, 13 ') is capable of indexing in position said closure plate (12) relative to said body (5) and a rest position in which said indexing member (13, 13') is not capable of indexing said closure plate (12) relative to said body (5) in position, said drawer (35) comprising at least one hook (36) configured to, in the working position, prevent manipulation of said clamping / spacing means (10) and conversely, in the rest position, allow manipulation of said clamping / spacing means (10). 7. A shutter according to any one of claims 1 to 6, characterized in that said at least one degree of freedom of said mechanical connection is a degree of freedom in translation. 8. A shutter according to any one of claims 1 to 7, characterized in that said at least one degree of freedom from said mechanical connection is a degree of freedom in rotation. 9. A shutter according to any one of claims 1 to 8, characterized in that said closure plate (12) cooperates with said tracking member (16) according to a mechanical connection of the point type having five degrees of freedom, two degrees of freedom in translation and three degrees of freedom in rotation. 10. Shutter according to any one of claims 1 to 8, characterized in that said shutter plate (22) cooperates with said tracking member (26) according to an elastic connection of deformable type having six degrees of freedom, three degrees of freedom in translation and three degrees of freedom in rotation.