FR2852536A1 - Raceway shaping apparatus for e.g. industrial location, has folding tool with lateral thrust blocking longitudinal wire to fold it and central thrust executing translation movement to push wire at its median point when piston is activated - Google Patents

Abstract

The apparatus has a folding tool (46) with a central thrust (51) that is arranged in side portion of a longitudinal wire (109) to be folded. The folding tool has a lateral thrust (58) that is arranged in another side portion of the wire. The thrust (51) executes a translation movement to push the wire at its median point when a piston is activated. The wire is blocked by the lateral thrust in order to fold the wire.

Description

The present invention relates to an apparatus and a

  assembly for shaping reticular structures, in particular cable trays, the width of which is in particular between 50 and 600 millimeters.

  it is known that the cable trays are preferably installed in industrial premises as a support for electrical connection elements, such as cables. The route that these cable trays 10 must follow is imposed by technical requirements, by the configuration of the building and by the movement of the machines contained inside. This is why it is often necessary to make a change of direction through a curved path element.

  The cable trays are supplied in rectilinear sections, made with an interlacing of rectilinear, longitudinal and transverse steel wires, forming rectangular meshes. The ends of the 20 transverse wires are folded upwards to constitute the sides delimiting the path.

  To obtain a curved element, one starts from a rectilinear element, which is sliced so as to remove the longitudinal wire segments, comprised between two transverse wires, from the base and from the side in which the curvature is to be obtained. The edges are then brought closer to the cut side and assembled with a connector, preferably of the plate-to-plate type against plate and clamping bolt.

  This operation is carried out for several transverse sectors according to the desired angle of curvature. Advantageously, the sliced sectors are intercalated with entire sectors in order to obtain a greater radius of curvature, so as not to weaken the structure too much and for problems inherent in the joining of more than two transverse wires.

  These curved path structures require some time to be made, as well as the use of additional accessories for fittings. The cutting of structural parts of the path conditions its mechanical resistance and resistance to oxidation, since unprotected surfaces are created, and in addition these surfaces have sharp edges which could cut the cables or injure the operator.

  The object of the present invention is to provide an apparatus for shaping reticular structures, in particular cable trays, which overcomes the drawbacks of the cited prior art.

  The object of the invention is to provide an apparatus capable of allowing the bending of cable trays with a quick and simple operation.

  Yet another object is to produce an apparatus 25 which makes it possible to produce curves of various angles.

  Yet another object is to provide an apparatus which makes it possible not to alter the characteristics of mechanical resistance and of resistance to oxidation of the paths in the folding operation.

  Yet another object is to make a device usable with cable trays of all dimensions existing today.

  For this purpose, it relates to an apparatus for shaping reticular structures, in particular cable trays, characterized in that it comprises a cutting tool, forming shears, comprising at least two cutting devices, and an actuation device, capable of simultaneously actuating these cutting devices, so as to simultaneously cut ends of a portion of wire of a reticular structure and thus to remove this portion in a single operation.

  According to other characteristics of the invention - said cutting devices are capable of being separated by a distance which corresponds to the distance between transverse wires of the structure which delimit said portion of wire to be sliced, so that the cut is made flush with said transverse wires; said tool forming shears comprises a base having parts of greater thickness which delimit a space intended to receive a slicing slider, said parts of greater thickness 25 having orifices for engaging with an upper closure plate, whereas parallel appendages protrude from said base, appendages on which is intended to rest the wire intended for slicing, these appendages having ends in relief which form a delimiting edge for said wire, and which are provided with pointed extensions which form said cutting devices with additional parallel appendages with which the slicing slider is provided, this slider being slidably mounted relative to the thicker parts of the base, in order to produce a sliding system which limits the relative movement between said cursor and said base to a translational movement; said tool forming shears comprises, on the surface of said base opposite to said appendages, an orifice for receiving the actuating device, which comprises an oleodynamic piston, the movable part of which extends, in service, inside said 15 base by engaging with said slicing slider, on the side opposite to said additional appendages thereof.

  Another subject of the invention is an apparatus for shaping reticular structures, in particular cable trays, characterized in that it comprises a folding tool which comprises at least one central stop, capable of being disposed of 'one side of a portion of bending wire of the structure, at least one lateral stop, capable of being disposed on the other side of the portion of bending wire, as well as actuation means, suitable for moving this central stop relative to the or each lateral stop, so as to fold said portion of wire.

  According to an advantageous characteristic, the actuation means comprise an oleodynamic cylinder comprising a piston rod sliding in a cylinder to which a sleeve is fixed, at the free end of the rod being subject to a central rod, coaxial with the cylinder, and to the end of the central rod 5 being fixed the central stop, said sleeve comprising a cylindrical tubular central part in which is threaded a corresponding end of said cylinder, and two lateral extensions, diametrically opposite, while on the lateral ends 10 of the sleeve are articulated two arms which are provided, at their end opposite their point of articulation, lateral stops, each of which is connected to the central stop by means of a respective connecting rod.

  The invention finally relates to a set of shaping reticular structures, in particular cable trays, characterized in that it comprises an integrated workbench equipment, comprising at least one cutting means and at least one means folding said structure.

  According to other characteristics of the invention - said integrated workbench equipment comprises a support structure for means of control and actuation of the or each means of cutting and folding of said reticular structure; - said integrated bench equipment includes an electrical panel, a mini oleodynamic power station and distribution mechanisms; - Said integrated workbench comprises blocking stirrups, capable of maintaining said reticular structure during its machining; - A folding means is an oblique folding device, suitable for bending a portion of the path obliquely, in particular perpendicular, with respect to the initial plane of the non-curved path; said oblique folding device comprises a roller having an upper axis of the workbench which is fixed at one end to a plate perpendicular to the upper surface of the workbench while, on said plate, on the same side as the roller, is fixed a cylindrical arm parallel to the roller, said plate being able to rotate about an axis of rotation coinciding with the axis of the roller, so that said cylindrical arm makes a movement of revolution around the roller, keeping itself always parallel to it; a folding means is a folding equipment capable of simultaneously folding a plurality of wires of the reticular structure, said equipment comprising a plurality of movable marks, for stopping and positioning transverse wires of said structure, means of folding at least one wire of the structure, comprising a central cursor suitable for engaging with at least one longitudinal wire on the side of said structure, and an actuator for actuating said central cursor; said folding equipment comprises a base which constitutes the support for the movable marks, the actuator being received, at least partially, in this base.

  Additional characteristics and advantages will appear more clearly on reading the description of preferred but not exclusive embodiments of the invention, illustrated in the accompanying drawings, in which: FIG. 1 is a perspective view of a section of cable tray having a reticular structure; Figure 2 is a perspective view, similar to the previous one, illustrating a folded part of the road section; Figure 3 is a plan view of a curved portion of a road section according to another embodiment of the invention; FIG. 4 is a perspective view of a shear forming tool, according to the invention, illustrated during the step of cutting a portion of longitudinal wire; Figure 5 is a perspective view of the shear tool without its closure plate; Figure 6 is an enlarged view, with respect to Figure 4, illustrating the blades of the shear tool 25 during slicing; Figure 7 is a perspective view of a folding tool, according to the invention, which engages with the side of a path, illustrated during the step preceding the execution of said folding; Figure 8 is a view similar to the previous one illustrating the folding operation; Figure 9 is a perspective view of integrated workbench equipment according to the invention; Figure 10 is a large-scale detail view of the path blocking system on the workbench equipment of the previous figure; Figure 11 is an enlarged side view of the folding rollers of the integrated bench equipment; Figure 12 is an enlarged detail view of a shear of integrated workbench equipment; FIG. 13 is an enlarged detail view of a folding device, of the lateral type, forming part of the integrated bench equipment.

  With reference to the cited figures, the apparatus for the curving of reticular structures, according to the invention, is particularly usable for cable trays of reticular structure of the type illustrated in FIG. 1, on which one can see a section of path 2 consisting of an intertwining of longitudinal 5 and transverse 6 straight steel wires, forming rectangular meshes 9.

  The ends of the transverse wires 6 are folded upwards to form the sides 21 of the path, advantageously having a hooked profile 7 to better engage with the external double longitudinal wires 8.

  FIGS. 2 and 3 illustrate two embodiments of a curved part of a path that can be produced with the apparatus according to the invention, starting, for both, from a rectilinear section of path, of the type illustrated in FIG. 1. These two embodiments are moreover described in the French patent application filed on March 11, 2004, in the name of the same Applicant, under the title "Method of manufacturing a road structure, in particular 10 for electric cables and the like, and path structure thus obtained ". The content of this request is incorporated by reference in the present description.

  In FIG. 2 is illustrated a first embodiment of the curve identified by the reference number 1, obtained by bending the longitudinal steel wires 5 and 8 in their internal portions 15, in at least one transverse sector 18 delimited by two 10 consecutive transverse steel wires.

  The transverse wires 10 retain the rectilinear appearance 20 but not the parallelism, causing the two rectilinear sections of path 11 and 12, adjacent to the deformed sector or sectors 18, to be no longer aligned, consequently making a change of management.

  The internal folding angle 17 is all the smaller as the element 15 is internal to the curve, causing the non-parallelism between the transverse wires 10 and, consequently, the aforementioned change of direction.

  By deforming several consecutive sectors, the changes of direction are added by producing a curved element, the angle of curvature of which can take any desired value depending on the number of sectors which are deformed.

  FIG. 3 illustrates a second embodiment of a curve, identified by the reference number 103, obtained by first of all extracting, in one or more transverse sectors 118, the portions of longitudinal wire from the base 122, leaving exclusively the wires 108 constituting the sides of said path.

  Next, the portions 109 are folded on the side on which it is desired to produce the curvature, obtaining the non-parallel approximation of the transverse wires 110 which delimit the transverse sector 118. These wires 110 remain in all cases rectilinear, bringing the two non-deformed portions of path 111 and 112, adjacent to the sector or to the deformed sectors 118, to be no longer aligned, by carrying out a change of direction.

  Again, by deforming several consecutive sectors, it is possible to obtain the desired angle of curvature 104.

  The extraction of the longitudinal portions 105 from the base requires cutting them, for example using a shear.

  This slicing operation is advantageously carried out by means of an apparatus in accordance with the present invention, which is in particular illustrated in FIGS. 4 to 6.

  To make a curve of the type illustrated in FIG. 3, it is necessary, as we have seen, to cut a certain number of portions of wire beforehand. To this end, the apparatus according to the invention comprises a shear forming tool, generally designated by the reference number 30, which comprises two cutting devices 31 and 32 suitable for simultaneously slicing the ends of the portion of wire 105 of the base. 122, by removing it in a single operation.

  Advantageously, the distance between the cutting devices 31 and 32 is adjusted to the distance between the transverse wires 110 which delimit the longitudinal portion 105, so that the cut is made flush with the transverse wires 110.

  The shear forming tool comprises a base 33 having portions 34 of greater thickness, which delimit a space intended to receive a cursor 35 which performs the slicing. The raised portions 34 have orifices 36 for engaging with an upper closure plate 37, illustrated only in FIG. 4.

  From the base 33 project two parallel appendages 38, on which the wire intended for cutting is supported, and which have ends 39 in relief which form the delimiting edge of the wire. The lateral sides of these raised ends 39 have pointed extensions 40, extending axially in the direction of the body of the base, which constitute stops for slicing. The distance between the extensions 40 is similar to the distance between two consecutive transverse wires 110, that is to say the length of the longitudinal portion 105 to be cut.

  The cursor 35 also has two appendages 41 which, with the extensions 40 of the appendages 38 of the base, form the blades of the shears, namely the cutting devices 31 and 32. On the side opposite to the 10 appendices 41, the cursor 35 is formed so as to engage with the raised portions 34 of the base 33, by forming a slide system which limits the relative movement between the cursor 35 and the base 33 to a simple translational movement.

  On the surface of the base 33 opposite the appendages 38 is an orifice 42 intended to come into engagement with an actuating device, which comprises an oleodynamic piston 43 whose movable part 44 extends inside the base 33 , by engaging with the cursor 35 on the side opposite to the appendages 41.

  The portion of longitudinal wire 105 to be cut is placed on the appendages 38 between the delimiting edges 39 and the body of the base 33. By actuating the oleodynamic device, the cursor 35 is pushed back, which brings the appendages 41 closer to the cursor by compared to base 40 extensions.

  This contributes to closing the cutting devices 31 and 32, and thus to simultaneously slicing the two ends of the longitudinal wire 105, the corresponding portion of wire thus being able to be easily removed.

  Thanks to the particular dimensions of the tool, the longitudinal wire 105 is cut flush with the transverse wires 110, avoiding the projecting and cutting edges. In addition, the cutting devices 31 and 32 are made so that, during cutting, the protective coating of the wires is not cut, retaining the resistance to oxidation of the finished product. Once the cutting operation has been completed, the longitudinal wires 109 are bent on the side on which the curvature is to be obtained. To this end, an apparatus according to the invention comprises a folding tool, illustrated in FIGS. 7 and 8, which is generally designated by the reference number 46.

  The folding tool is advantageously actuated using an oleodynamic cylinder 47 comprising a rod 48 of a piston sliding in a cylinder 49 to which a sleeve 52 is fixed. At the free end of the rod 48 is secured a central rod 50, coaxial with the cylinder, while at the end of the central rod is fixed a first stop 51, which extends perpendicular to the axis of this cylinder.

  The sleeve 52 comprises a cylindrical tubular central part 53, into which the end of the cylinder 49 is threaded, and two lateral extensions 54, diametrically opposite, which extend in the radial direction.

  On the ends of the sleeve 52 are articulated two arms, a right 56 and a left 57, which extend in the direction of the central rod 50. These arms 56 and 57 have, opposite the sleeve, respective stops 58, parallel to the central stop 51 of the central rod 50, which come into engagement with the ends of two connecting rods 60. The opposite ends of these two connecting rods 60 are articulated at the free end of the central rod 50 by means of the central stop 51.

  The central stop 51 is positioned at a midpoint 10 of the portion of wire 109 to be folded, inside the path, while the lateral stops 58 are positioned towards the ends of the portion of wire 109 to be folded, at the outside the path. In this step, the piston 48 is returned inside the cylinder 49, therefore it is preferable that the arms 56 and 57 are longer than the central rod 50.

  When the piston 48 is actuated, the central stop 51, which performs a translational movement, pushes the longitudinal wire 109 back to its midpoint. This wire 20 109, which is also blocked by the lateral stops 58, is therefore bent.

  By advancing the central stop 51 further, it exerts a tensile force on the links 60 which, in turn, transmit this force to the arms 56 and 57, initially parallel. The latter, which can only rotate around their respective axes, are therefore forced to close. This movement of bringing the arms 56 and 57 closer brings the stops 58 closer, limiting the folding of the longitudinal wire 109 to the internal portion of the transverse wires 110.

  The cutting and folding tools described above allow you to cut and fold the elements of the path quickly and easily.

  According to another aspect of the invention, the apparatus may include integrated workbench equipment comprising various devices capable of cutting and folding the paths.

  The integrated workbench equipment according to the invention, generally designated by the reference number 61, comprises a support structure 62 containing an electrical panel, a mini oleodynamic power station and distribution mechanisms, not visible in the figures.

  On the upper surface of the support structure are arranged the various tools or devices for machining the path, including a cutting tool 63, for example analogous to that previously described, a folding device 67, of oblique type. , and folding equipment 72, of the lateral type.

  The support structure further comprises locking stirrups 66 capable of retaining the path during the folding operations.

  The oblique folding device 67 serves to produce variations in the inclination of the path, that is to say folds in the "vertical" direction. As a result, a portion of the path is curved obliquely, in particular perpendicular, with respect to the initial plane of the path that is not curved. This is to be compared with the embodiment of FIG. 3, in which the path is curved, while remaining in its initial plane.

  The oblique folding device 67 comprises a roller 68 having an axis parallel to the upper surface of the structure, and perpendicular to the long sides 64 of this structure 62. This roller 68 is fixed at one end to a plate 69, perpendicular to the upper surface of the structure 10 62. On the plate 69, on the same side as the roller 68, is fixed a cylindrical arm 71, parallel to the roller 68 and of similar length.

  The plate 69 is placed in rotation along its own plane, its axis of rotation coinciding with the axis 15 of the roller 68. This plate 69 is driven by a motor 70, via a transmission belt 65. Consequently, the cylindrical arm 71 performs a movement of revolution, in an arc of a circle, around the roller 68, always keeping itself parallel to it.

  The lateral folding equipment 72 makes it possible to fold all the longitudinal wires 15 internal to a transverse sector 18, and consequently makes it possible to produce both curves of the type illustrated in FIG. 2, as well as of the type illustrated in FIG. 3. In contrast to the device 67, the device 72 ensures a "lateral" folding of the path, namely in the initial plane thereof.

  This equipment is moreover similar to that described in the French patent application, filed on the same day as the present application, in the name of the same Applicant, under the title "Apparatus for the curving of reticular structures, in particular paths. of cables ".

  The folding equipment 72 comprises a base 73, formed by the upper surface of the support structure 62, or else made integral with the latter. The base 73 constitutes the support for movable members 74, which include arms 76 and 77, members which are actuated by means of an oleodynamic actuator, not visible in the figures and integrated into the support structure.

  At two vertices of the structure 73 are articulated the movable arms 76 and 77, while at the opposite vertices 15 is fixed a slide 78. On the structure 73 there is a groove 79 in which the tail 80 of a main cursor slides , actuated by the actuator, having over most of its height a rectangular section with a rounded edge, and an upper end having a triangular section.

  At the rear of the tail 80 is an auxiliary cursor 81 which follows the movement of the tail 80 and has a pointed front edge. The cursor 81 is provided with a perforated appendage 82 for engaging with connecting rods 83.

  The connecting rods 83 have one end secured to the appendage 82 of the slider 81 by means of a pin which allows rotation.

  The opposite ends of the links 83 are articulated respectively to the right arm 76 and to the left arm 77.

  The arms 76 and 77 include a rectilinear portion 5, disposed parallel to the long side of the structure 73, followed by a bend which causes the right arm 76 to be subjected to the left top of the structure, opposite the slide 78, and the left arm 77 to be subjected to the right top of the structure, opposite to the slide 78.

  Near the elbows are grooves 84 and 85 which allow the arms 76 and 77 to cross.

  The arms 76 and 77 are secured by means of pivots to the structure, allowing their rotation relative to the latter.

  On the rectilinear portions of the arms 76 and 77 are present pins 86 for stopping and for centering the transverse wires of the path 2. The pins 86 are grouped two by two and arranged obliquely on the arm.

  For the same purpose, there are provided pins 87 of larger dimensions than the previous ones, and stops 88 which act on the external double longitudinal wire of the path by supporting greater stresses.

  The ends of the arms 76 and 77, opposite those perforated, are subject to a slide 78 which limits its movement.

  The movable members 74 also include a series of connecting rods 89, quite similar to the connecting rods 83, arranged symmetrically between the arms 76 and 77.

  Each connecting rod 89 has one end articulated at the end of the opposite rod, via a pin 90, while its other end is articulated respectively to the right arm 76 and to the left arm 77.

  Advantageously, these pairs of connecting rods are never aligned but always form a certain angle 91, in such a way that heel holes are never created and the movement of each spindle 90 always takes place in the desired direction.

  The path part 2 is positioned on the device 72 to be folded, by placing the transverse wires of the sector which it is desired to deform between the facing pins 86, which act as stop elements. Then, the actuator is maneuvered, so as to move the tail 80, the auxiliary cursor 81 and the pins 90, which contribute to folding the various longitudinal wires of the path.

  The invention provides an apparatus for shaping reticular structures, in particular cable trays, which allows the production of curves of a desired size in an easy and rapid manner, while retaining its characteristics of mechanical resistance and oxidation.

  An advantage of the invention is the possibility of curving contiguous sectors.

  Another advantage of the invention is that it does not require the use of additional elements for the fittings.

  Another advantage of the invention is conferred by the fact of being able to perform a large number of folding operations in a short time.

  The apparatus according to the invention is susceptible to numerous modifications and variations, all of which fall within the scope of the invention. In addition, all details may be replaced by technically equivalent elements. Of course, the materials used, as well as the dimensions,

  could be any, depending on the specific requirements and the state of the art.

Claims (14)

  1. Apparatus for shaping reticular structures, in particular cable trays, characterized in that it comprises a cutting tool, forming shears (30), comprising at least two cutting devices (31, 32), and an actuating device (43), capable of simultaneously actuating these cutting devices, so as to simultaneously cut ends of a portion of wire (105) of a reticular structure and thus to remove this portion (105) in one operation.   2. Apparatus according to claim 1, characterized in that said cutting devices (31, 32) are adapted to be separated by a distance which corresponds to the distance between transverse wires (110) of the structure which delimit said portion ( 105) of slicing wire, so that the cut is made flush with said transverse wires.   3. Apparatus according to claim 1 or 2, characterized in that said shear forming tool (30) 20 comprises a base (33) having parts (34) of greater thickness which delimit a space intended to receive a slicing cursor ( 35), said larger parts having holes (36) for engaging an upper closure plate (37), while parallel appendages (38) protrude from said base (33), appendages on which the wire intended for slicing is intended to rest, these appendages having raised ends (39) which form a delimiting edge for said wire, and which are provided with pointed extensions (40) which form said cutting devices (31, 32) with additional parallel appendages (41) 5 which is provided with the slicing slider (35), this slider being slidably mounted relative to the parts (34) of greater thickness of the base (33), in order to providing a slide system which limits the relative movement between said slider (35) and said base (33) to translational movement.   4. Apparatus according to claim 3, characterized in that said tool (30) forming shears comprises, on the surface of said base (33) opposite said appendages (38), an orifice (42) for receiving the actuating device , which comprises an oleodynamic piston (43), the movable part (44) of which extends, in service, inside said base while engaging said slicing slider (35), on the side opposite to said additional appendages ( 41) of the latter.   5. Apparatus for shaping reticular structures, in particular cable trays, characterized in that it comprises a folding tool (46) which comprises at least one central stop (51), capable of being disposed of 'one side of a portion of wire (109) to be folded from the structure, at least one lateral stop (58), capable of being arranged on the other side of the portion of wire (109) to be folded, as well as actuation means (47) adapted to move this central stop (51) relative to the or each lateral stop (58), so as to bend said portion of wire (109).   6. Apparatus according to claim 5, characterized in that the actuating means comprise an oleodynamic cylinder (47) comprising a piston rod (48) sliding in a cylinder (49) to which a sleeve (52) is fixed, the free end of the rod (48) being subject to a central rod (50), coaxial with the cylinder, and to the end of the central rod (50) being fixed the central stop (51), said sleeve (52) comprising a cylindrical tubular central part (53) into which a corresponding end of said cylinder (49) is threaded, and two lateral extensions (54), diametrically opposed, while two arms (56, 57 are articulated on the lateral ends of the sleeve ) which are provided, at their end opposite their point of articulation, lateral stops (58) each of which is connected to the central stop (51) by means of a respective connecting rod (60).   7. Assembly assembly of reticular structures, in particular cable trays, characterized in that it comprises integrated workbench equipment (61), comprising at least one cutting means (63) and at least one folding means (67, 72) of said structure.   8. An assembly according to claim 7, characterized in that said integrated workbench equipment (61) comprises a support structure (62) for means 30 for controlling and actuating the or each cutting means (63) and folding (67, 72) of said reticular structure.   9. The assembly of claim 8, characterized in that said integrated workbench equipment (61) 5 includes an electrical panel, a mini oleodynamic power station and distribution mechanisms.   10. The assembly of claim 8 or 9, characterized in that said integrated workbench equipment (61) comprises stirrups (66) for locking, capable of maintaining said reticular structure during its machining.   11. Assembly according to one of claims 7 to   10, characterized in that a folding means is an oblique folding device (67), suitable for bending a portion of the path obliquely, in particular perpendicularly, relative to the initial plane of the path in an uncurved manner.   12. The assembly as claimed in claim 11, characterized in that said oblique folding device (67) comprises a roller (68) having an axis parallel to the upper surface of the workbench (61), which is fixed at one end to a plate (69) perpendicular to the upper surface of the workbench (61) while, on said plate, on the same side as the roller, is fixed a cylindrical arm (71), parallel to the roller (68), said plate (69) being able to rotate about an axis of rotation coinciding with the axis of the roller (68), so that said cylindrical arm (71) performs a movement of revolution around the roller (68), now always parallel to it.   13. Assembly according to one of claims 7 to   12, characterized in that a folding means is a folding equipment (72) suitable for simultaneously bending a plurality of threads of the reticular structure, said equipment comprising a plurality of movable marks (86, 87), for the stopping and positioning transverse wires of said structure, means (80, 10 81, 90) for folding at least one longitudinal wire of the structure, comprising a central slider (80) suitable for engaging with at least one longitudinal side wire of said structure, and an actuator for actuating said central cursor.   14. The assembly of claim 13, characterized in that said folding equipment (72) comprises a base (73) which constitutes the support for the movable markers (86, 87), the actuator being received, at least partially, in this base (73).