FR2667225A1 - CURSOR FOR BAGS OR BAGS HAVING A PLASTIC CLOSURE WITH TWO EMBLEMABLE PROFILES. - Google Patents

Abstract

The invention relates to a slider for sachets or bags provided with a plastic closure with two interlocking profiles, comprising two lateral wings which define, with an elongated central sole, two converging passageways for the interlocking profiles, this sole being supported as a door. - overhang by a central separating rib. According to the invention, the lateral wings (101, 102) of the slider (100) are interconnected by two connecting bridges (103, 104), one of which is integral with the separating rib (105), the flexibility of said bridges allowing automatic placement of the cursor by spacing its lateral wings; the separating rib (105) extends beyond the connecting bridge (103) in the median plane of the slider, so as to reinforce the rigidity of the connection between rib and sole; the guide facet (115) associated with the smaller of the two profiles has an inclined ramp extending over the entire length of the elongated sole (108), so as to reinforce the rigidity of this sole. Application to the production of plastic sliders by molding.

Description

The present invention relates to slider closures in which

  the slider overlaps two interlocking profiles connected continuously to the edges of a bag or a bag, and allows, according to its direction of travel, to open or close the closure by disengagement or mutual engagement of the profiles that deform elastically in said cursor. Such plastic slider closures have existed for a long time. It is thus known to provide a slider having two lateral wings connected together and which define, with an elongated central sole, two convergent passageways for the nestable profiles, said soleplate being supported cantilevered by a central rib of separation, and having, on both sides of said rib, two guide facets, one of which is associated with the smaller of the two profiles and

has an oblique part.

  Such a cursor is for example described in the French patent

  No. 1,532,295 filed by the plaintiff.

  A cursor of this type, however, has several drawbacks.

  which are inherent in its structure.

  A first drawback lies in the fragility of the link

  between sole and rib, and in the flexibility of said sole.

  Indeed, if we look at Figures 3 and 4 of the aforementioned French patent, it is found that the separation rib extends a small distance from the long cantilever length of the elongate sole, which extends to the level of the end of the cursor, which

  induces excessive fragility and flexibility of this sole.

  These defects, besides the weakness of the part itself, naturally have a very unfavorable effect for the precision of the guidance of the two interlocking profiles and the resistance of the slider to tilt (in a median plane of the cursor) It should also be noted that the guide facet associated with the smaller of the two profiles is formed of a first straight portion, very short, followed by an inclined portion, also very short, which is connected to a long straight portion which is at the same level as the Another facet, for the cantilevered part of the elongate sole: the first straight portion corresponds to the guide stroke of the small profile, so that the guidance obtained is relatively inaccurate and

unreliable.

  In addition, the difference in level between the two facets of the sole is only a very short length, and this is in addition to the already mentioned excessive flexibility of the elongated sole, increasing

  still the risk of tilting the cursor in case of rough handling.

  To these defects is also added the fact that such a slider is not adapted to modern techniques of automatic installation by spacing

of its lateral wings.

  Indeed, the lateral wings of this slider are interconnected, and over their entire length, by a single thick and slightly flexible bottom, so that, even by adding on the bottom longitudinal outer ribs adapted to cooperate with an associated tool , the stiffness of this background

  would considerably interfere with the spacing of the lateral wings.

  There are also other types of sliders, whose structure is more specifically adapted to a laying technique

  automatic by spacing their side wings.

  For example, reference can be made to European Patent Application No. 004 707, in which a slider is described whose lateral wings are interconnected by a central connecting bridge, and which is surmounted by longitudinal ribs serving to separate the lateral wings.

  for an automatic pose of said cursor.

  However, such a slider does not have a real elongated sole for guiding interlocking profiles, but a short portion in the form of an arrowhead, giving the slider a trident-like exit profile. Moreover, this short portion defines two narrow axial passages through which the sails of the closure pass, so that any burrs in the joint plane may cut these

  sails at the slightest pressure exerted on the lateral faces of the slider.

  Finally, the manufacture by molding of this type of slider is complex, and requires the use of three cores, two vertical cores passing

  on either side of the central connecting bridge.

  The state of the art is also illustrated by Luxembourg Patent NI 62 398, French Patent Nos. 1,345,580 and 2,228,704, and Moroccan Patent No. 16,089, all filed by the Applicant. These patents illustrate the efforts and research that have been

  exist in this field for over twenty years.

  Finally, reference may also be made to British Patents Nos. 914,204 and 1,012,988, to US Pat. No. 3,430,329, and to US Pat.

Australian NI 463,564.

  The object of the invention is to provide a more efficient cursor.

  mant, and which is particularly satisfactory in terms of the guiding quality of interlocking profiles, the absence of a tendency to tilt in case of rough handling, and the absence of risk of deterioration

profiles.

  Another object of the invention is to provide a slider which is capable of automatic laying by spreading its lateral flanges, being able to withstand very high laying speeds: as a guide, production rates greater than 3,000 bags per hour, all operations combined (bag production,

  gluing interlocking profiles, and laying cursors).

  The invention also aims to provide a slider whose structure allows a one-piece production of plastic, by molding, under reasonable financial conditions (so with molding facilities of simple design and high efficiency, and with

  a minimum of material for each unit cursor).

  It is more particularly a slider for bags or bags with a plastic closure with two interlocking profiles, having two side wings interconnected and which define, with an elongated central sole, two convergent passageways for the profiles nestable, said sole being supported cantilevered by a central separation rib, and having, on either side of said rib, two guide facets, one of which is associated with the smaller of the two profiles and presents an oblique part, characterized in that: the lateral wings of the slider are interconnected by two connecting bridges defining a central recess, one of which is integral with the separation rib, said bridges having sufficient flexibility to allow a automatic laying said cursor by spacing its lateral wings; the separation rib supporting the elongated sole extends in the central recess, beyond the connecting bridge which is integral therewith and in the median plane of the slider, so as to reinforce the rigidity of the connection between said rib and said soleplate ; the guide facet associated with the smaller of the two profiles has an inclined ramp extending substantially the entire length of the elongated sole, so as to reinforce the rigidity of said sole, the other guide face being straight to the free end of said sole. Preferably, the separation rib is extended, over its entire height, substantially to mid-length of the central recess. Thus, a very satisfactory rigidity is obtained at the level of the connection between the

rib and elongated sole.

  Advantageously also, the separation rib has a thick portion connecting to the connecting bridge which is integral therewith, and is extended by a narrower portion beyond said connecting bridge. Such variation in thickness does not appreciably reduce the rigidity of the connection between the rib and the elongated soleplate, and facilitates the molding operations insofar as each portion of the rib is made by

  one of the two cores that are needed to make the cursor.

  According to an advantageous characteristic, the guide facet associated with the smaller of the two profiles has a ramp in two parts, a portion of which is in a gentle slope adjacent to the separation rib, and a

  steeper part up to the free end of the elongated sole.

  It is thus possible to obtain a very satisfactory progressive guidance for the

profile concerned.

  Also preferably, the guide facet associated with the smaller of the two profiles has, beyond the separation rib, a substantially constant width to the free end of the elongated sole Although the symmetry is no longer respected in this case, because of the tapered shape of the elongated sole, this constant thickness ensures

  excellent rigidity at the cantilever end of said sole.

  Advantageously, the elongated sole is tapered symmetrically with respect to the median plane of the slider, with a free end spaced from the corresponding end of the slider. In particular, the elongated sole extends from one end of the slider, at the level of the rib. separation, up to a distance of about one quarter of the slider length of the other end of said slider, so as to define a common central corridor beyond the free end of said sole, and this corridor common center is delimited by facets parallel to the median plane of the slider, formed on the inner side of the lateral wings. For example, the central central corridor has substantially the same

  length as the connecting bridge which delimits it superiorly.

  It is also interesting that the lateral edges of the elongated sole and the adjacent inner faces of the lateral wings are inclined at an angle substantially equal to 6 relative to the plane

  median of the cursor, and symmetrically with respect to said plane.

  Preferably, the central recess substantially affects half of the total length of the slider; in particular, the central recess has in section the general shape of an isosceles trapezium, and admits as a plane

  of symmetry the median plane of the cursor.

  It is also advantageous for the slider to be surmounted by two longitudinal ribs serving to separate the lateral wings with elastic flexion of the two connecting bridges by cooperation with an associated tool, during the automatic laying of said slider, said longitudinal ribs bordering the central recess. and extending to said bridges

link.

  Also preferably, the cursor is in the form of a

  single piece made of plastic material, produced by molding.

  Other features and advantages of the invention appear

  more clearly in the light of the description that follows and

  attached drawings, relating to a particular embodiment, with reference to the figures or: Figure 1 is a perspective view of a known slider, with a detachment to better see the hook sole; Figure 2 is a perspective view of a slider according to the invention, with a detachment to better distinguish the separation rib and the elongate sole that supports it; Figure 3 is a top view of the slider of Figure 2, and Figure 4 an end view of this slider; Figure 5 is a side view of the same cursor, and Figure 6 a view from below to better distinguish the passageways of the interlocking profiles; Figures 7 to 10 are views and sections, respectively along the lines VII-VII, VIII-VIII, IX-IX and XX of Figure 3, to better understand the relative movements of the nestable profiles in the slider of the invention ; FIGS. 11 and 12 illustrate a molding unit making it possible to manufacture the aforementioned cursor, FIG. 11 showing in plan view the lower insert and the associated pull-out core, and FIG. 12 illustrating

  in section the lower and upper inserts, with their associated core.

  FIG. 1 illustrates a known slider 1, with tearing making it possible to better see the short hook sole. Such a slider is similar to that described in the European patent application.

No. 004 707 cited above.

  The slider 1 comprises two lateral wings 2, 3, which are interconnected by a central connecting bridge 4 This connecting bridge 4 carries a separation rib 5 tapering downwards, and at the lower end of which a short sole 6 in the shape of an arrowhead is provided. On this side of the slider 1, the lateral wings present internally hook protrusions facing the arrowhead end 6: FIG. by the side wing 2, which thus defines a narrow axial passage 10 through which passes one of the sails of the closure; an identical axial passage is naturally provided on the other side of the end arrowhead 6, facing the right facet 16 of said end The tip arrowhead 6 has two symmetrical guide facets 7, 8, which are inclined, for guiding interlocking profiles The two axial passages open, beyond the end arrowhead 6, in a central corridor Il delimited by the lateral wings 2, 3 The slider 1 is also surmounted by two longitudinal ribs 14, 15, which can cooperate with a tool (not shown) which allow an automatic installation of said slider with spacing of the lateral wings 2, 3 (the gap being with a

  bending of the central connecting bridge 4).

  A slider of this type has several drawbacks which have already been indicated above with regard to the European patent application NI 004 707. In particular, it will be noted the poor guiding of the interlocking profiles by the facets 7, 8, these being symmetrical by relative to the median plane of the slider, so that no account is taken of the fact that one of the two interlocking profiles is smaller than the other The guiding race is also extremely short, and the central central corridor It concerns most of the length of the slider, so that the resistance to tilting is poor Sliders of this type are normally made in one piece, by molding, and it is necessary to use three cores, including two vertical cores corresponding to the two recesses 12 and 13 separating the wings 2 and 3, on either side of the central connecting bridge 4, and a horizontal core forming the lower part of the tip-shaped end arrow 6 and projections of the lateral wings The line 17 corresponding to the trace of the joint plane on the facet 16 of the arrowhead end 6 has been indicated in the figure, the other symmetrical facet, as well as the two parallel facets carried by the projections of the lateral wings, naturally have a trace identical to the line 17 of the joint plane: as a result, any burrs of the joint plane may cut the sails of the closure at the slightest pressure

  exerted on the lateral faces of the slider.

  We will now describe the cursor, object of this

  invention, with reference to Figures 2 to 6.

  The slider 100 comprises two lateral wings 101, 102 which are interconnected, not by a central connecting bridge as the known slider of Figure 1, but by two connecting bridges 103, 104, defining between them a central recess 120 The two connecting bridges 103, 104

  extend from each of the ends of the cursor, respectively

  The end 111 of the said end bridges 103, 104 have sufficient flexibility to allow the cursor 100 to be automatically installed by spacing its two lateral wings 101, 102: this, the cursor is surmounted by two longitudinal ribs 129, 130 serving to separate the lateral wings 101, 102 with elastic flexion of the two connecting bridges 103, 104, which allows to open the passageways of the interlocking profiles, according to a similar technique to that already described above It should be noted that the central recess 120 opens directly into the interior space of the cursor, so that it will be sufficient to use a single vertical core for the manufacture of this slider by molding (as will be explained later with reference to FIGS. 11 and 12), in contrast to

  known slider shown in Figure 1.

  The two lateral wings 101, 102, interconnected by the connecting bridges 103, 104, define, with an elongated central sole 108, two convergent passageways 117, 118 (only the passage 118 is visible in the perspective view of FIG. FIG. 2) for the interlocking profiles, said elongated central sole being supported in

  cantilevered by a central separation rib 105.

  However, unlike what is described in French Patent No. 1,532,295 discussed above, the separation rib 105 is carried by a connecting bridge (here the connecting bridge 103) and not by a background concerning the totality of the length of the slider, and moreover this separation rib is extended in the central recess 120, beyond the connecting bridge 103 which is integral therewith and in the median plane 200 of the slider, so as to reinforce the rigidity of the connection between this rib and the elongated central sole 108 The separation rib 105 thus extends over a substantial length of the central sole 108, in particular more than half the length of this sole, which considerably strengthens the resistance to the bending at the level of the connection between the separating rib and the elongated central soleplate Preferably, the separating rib 105 extends, over its entire height, substantially to the half-length of the recess In addition, the separation rib 105 here has a thick portion 106 connecting to the connecting bridge 103 which is integral therewith, and is extended by a narrower portion 107 beyond said connecting bridge. thickness in the separation rib, better visible in the views of Figures 3 and 6, does not significantly reduce the rigidity of the connection between the separating rib and elongated sole, and has the advantage of facilitating the molding operations in the measurement o each portion 106 and 107 is made by one of the two cores used to manufacture the slider 100 by molding,

  as will be explained below with reference to Figures 11 and 12.

  The elongated central sole 108, supported cantilevered by the central separation rib 105, has, on either side of said rib, guide facets, one of which is associated with the smaller of the two profiles, and has an oblique portion The general principle of an elongated central sole having two guide facets with a portion of different height is in itself well known, as is apparent from the French patent No. 1,532,295 already mentioned above, however, in the context of the present invention, the guiding facet which is associated with the smaller of the two profiles here has a particular structure which is very different from that described in the aforementioned French patent Indeed, and in accordance with an essential characteristic of the invention, the guide facet associated with the smaller of the two profiles, here the facet 115, has an inclined ramp 115 ', 115 "extending substantially over the entire length The advantage of such a structure is twofold, insofar as this makes it possible not only to lengthen the guide stroke of the smaller of the two profiles because of the considerable length of the inclined ramp. but also to considerably strengthen the rigidity of the elongate soleplate 108, the guiding facet 115 thus fulfilling an additional function of stiffening of this soleplate. The other guiding facet, here the facet 114, is straight up to the free end 113 of the elongated central soleplate 108, but it is bordered over its entire length firstly by the separation rib 105, then by the adjacent reinforcing rib whose upper face constitutes the facet of

inclined guide 115.

  Thus, it is possible to obtain both excellent rigidity for the elongated central soleplate, which is resistant to bending forces that can induce tilting of the slider in its median plane, as well as continuous guidance of the two interlocking profiles (which also contributes to the tilting resistance), while making it possible to automatically install the cursor by spacing its lateral wings thanks to the flexibility of the two connecting bridges, one of which supports the sole

central elongated.

  As can be seen in FIG. 2, the guide facet 115 associated with the smaller of the two profiles has a two-part ramp 115 ', 11511, of which a gently sloping portion 115' adjacent to the separation rib 105, and a more slanted portion 115 "up to the free end 113 of the elongated sole 108 It goes without saying, however, that a different level variation could be provided, for example with a rounded connection in the vicinity of the free end of the elongate sole 108, to the extent naturally one respects the principle of a raised facet of guidance that extends substantially over the entire

  length of said sole, so as not to affect the rigidity thereof.

  The elongated soleplate 108 is tapered symmetrically with respect to the median plane 200 of the slider 100, at an angle which is

  example of the order of 6 relative to the median plane 200, and symmetrical-

  However, it is advantageous to provide, as can be seen more clearly in FIG. 3, that the guide facet 115 associated with the smaller of the two profiles has, beyond the separating rib 105, a substantially width. constant up to the free end 113 of the elongated soleplate 108 which preserves the rigidity of

  the central sole elongated to the free end thereof.

  The elongated central sole 108 thus has a generally triangular shape, with lateral edges 123 and 124 inclined with respect to the median plane of the slider, these lateral edges converging towards one another from the wide end 109 of the sole until at the other narrow end thereof, which is the free end 113 The face of the wide end 109 of the elongated central soleplate 108 is preferably contained in the plane of the end 111 of the slider (end-end-end ), so as to define an end face concerning both the lateral wings 101, 102, the associated connecting bridge 103, and the separation rib 105. The underside of the elongate central soleplate 108 also extends according to a plane substantially parallel to the right facet 114 of said soleplate, with a bottom 127 possibly being bordered by a fillet 128 of connection over the entire periphery of the sole, as can be seen on FIG. FIG. 6 shows such a disposition that the mechanical characteristics of the slider do not affect the rigidity of the soleplate, but

  facilitates manufacturing operations by molding.

  On the other hand, it should be noted that the elongate soleplate 108 has a free end 113 which is remote from the end 116 of the slider (inlet side end). This is advantageous not only to the extent that the length can be decreased. cantilevered of the elongated central sole, but also to the extent that one can thus have a common central corridor 119 in which open the lateral passageways 117, 118, the outlet of this common central corridor outwardly being parallel to the median plane of the cursor, which avoids a sudden change of direction for the interlocking profiles and the sails which carry them, at this end of said cursor Indeed, as it is better visible in Figure 6, the common central corridor 119 is defined by facets 121, 122 parallel to the median plane 200 of the slider, facets which are formed of the

  inner side of the lateral wings 101, 102.

  This arrangement thus provides a significant advantage over the known slider described in the aforementioned French Patent No. 1,532,295, since the known slider had an elongated central sole extending to the level of the end edge of the slider, where a large cantilever, with in addition a marked angle for the profiles

  nestable and the sails that carry them.

  Preferably here, the elongated soleplate 108 extends from the end 111 of the slider to a distance of about one quarter of the total length of the slider of the other end 116 of said slider, so as to define a corridor common central 119, beyond the free end 113 of the sole, extending over about a quarter of the total length of said slider Advantageously, the common central passage 119 will have substantially the same length as the connecting bridge 104 which the delimits

  higher, because this simplifies the manufacture of the slider by molding.

  As best seen in the views of FIGS. 3 and 6, the side edges 123, 124 of the elongated sole 108, and the adjacent inner faces of the side wings 101, 102 (faces 125 and 126), are all inclined in a same angle relative to the median plane 200 of the slider, this angle being substantially equal to 6 as indicated above, being arranged symmetrically with respect to said plane. The inner faces 125, 126 of the lateral wings 101, 102 preferably extend vertically, that is to say, perpendicular to the two connecting bridges of the slider, so as to simplify the manufacture of said slider by molding: in this case, the central recess 120 has in section the general shape of an isosceles trapezium, and admits As a plane of symmetry the median plane 200 of the slider Advantageously, in addition, the central recess 120 concerns substantially half of the total length of the slider, the other half being distributed in the length of each of the connecting bridges 103, 104 It will also be preferable to provide a connecting bridge 103 long enough to ensure a solid connection with the separation rib 105, which explains that the connecting bridge 103 is shown here

  longer than the other connecting bridge 104.

  As can be seen in FIGS. 3, 5 and 6, the lateral wings 101 and 102 have externally toothed teeth 140 to make it easier to grip the slider 100 with two fingers, as this is

well known in this field.

  The mode of operation of the cursor 100 which has just been described will be clearly understood with reference to FIGS. 7 to 10, which are views and sections illustrating the relative displacements of the interlocking profiles in

said cursor.

  If one is placed on the input side of the cursor, that is to say in front of the end 116 thereof, we see the two nestable profiles interengagement state (view of Figure 7), these profiles and the upper zone of the closing sails which carry them passing through the common central corridor 119 There are shown here two interlocking profiles 201, 202 extending the edges of the associated closing sails 203, 204, it being understood that the precise structure of each of these profiles is simply shown by way of example, and that one can use any other type of interlocking profiles The profile 201 here carries two hook-shaped end branches, while the profile 202 carries three branches, two of which are end-to-end. hook shape: according to the terminology previously used, the profile 201 is in this case the smaller of the two profiles, that is to say the one that is concerned with the inclined ramp guide facet of the soleplate central elongated If one is placed at the opposite end of the cursor, the output side thereof, so in front of the end 111 (view of Figure 10), the nestable profiles 201 and 202 are then disengaged one on the other, by progressive separation with

  elastic deformation within the slider 100 Intermediate positions

  diaries are illustrated in Figures 8 and 9, which are sections substantially at the first and second third, respectively, starting from the end of the input side of the cursor, that is to say the end 111 of said cursor. It goes without saying that the representations of FIGS. 7 to 10 are

  essentially schematic, and are intended only to illustrate the

  relative relative to the interlocking profiles in the slider of the invention (in particular, it should be noted that the separation rib and the elongated central sole have not been shown in FIG. 7 so as not to load the representation) figures show that the small profile, that is to say the profile 201, is guided continuously throughout its contact with the inclined ramp facet 115 of the elongated central sole 108, so that the small profile is still positioned with respect to the complementary nesting profile 202, with further effective resistance to the tilting of the cursor in the median plane of said cursor in

  case of brutal manipulation of it.

  The above description shows that we have thus succeeded in

  to achieve a particularly efficient slider, and in particular very satisfactory in terms of the quality of guiding interlocking profiles, and

  the absence of a tendency to tilt in case of rough handling.

  The elongated central sole remains well positioned relative to the rest of the body of the slider, and its own rigidity is very high compared to the known sliders Moreover, such a slider is quite suitable for automatic installation by spacing its lateral wings, being able to withstand very high installation rates, compatible with a rate

  manufacturing of 3,500 bags per hour.

  We will now briefly describe a molding unit for manufacturing the aforementioned slider, in order to illustrate the ease of production of this slider by molding, in the form of a single piece of plastic material, with a molding installation of simple design and high efficiency, and with a minimum of material

for each unit cursor.

  As can be seen in FIG. 12, a molding unit 300 comprises a lower insert 301 and an upper insert 302, as well as two cores 303 and 304. The lower insert 301 here has three injection points 305, one of which injection device located in the median plane of the insert (which corresponds to the median plane of the slider) and provided at the widened bottom of the elongated central soleplate of said slider The lower insert 301 also comprises an axial passage 306 for inserting the horizontal core 303, which is a pull-out core, in a direction parallel to the joint plane The core 303 has two end tabs 307 and 308, with a relative height offset therebetween, to make a portion of each the two facets of guiding the elongate central sole The slot 309 defined between the legs 307 and 308 of this core 303 corresponds to the thick portion 106 of the separation rib 105: if one refers to the view of below the figure 6, it is thus understood that the tabs 307 and 308 of the core 303 extend (when the molding unit is in the injection position, with the inserts arranged against each other and the two cores set up) up to the level of the rear edge 141 of the central recess 120 The upper insert 302 has meanwhile a vertical corridor 310 for setting up the vertical core 304, the lowest portion 311 then complete the end of the first horizontal core 303 (when these two cores are in place for the injection), in order to make the remaining part of the elongate central sole and the separation rib, that is to say the parts which extend beyond the edge 141 of the connecting bridge 103 The tear-out illustrated for the upper vertical core 304 also shows a slot 312 which completes the slot 309 of the horizontal core 303 (when the two cores are in place), and corresponds at the narrow portion 107 of the nerve If we refer again to the bottom view of FIG. 6, it can be seen that the thicker portion 106 extends very slightly beyond the edge 141 of the connecting bridge 103, which corresponds to for the vertical upper core 304, with a very slight widening of the opening of the slot 312: this makes it possible to facilitate the flow of the material during the injection, and to avoid any molding defects, such as shrinkage, which might weaken the mechanical strength of this rib. The possibility of using only two cores for the molding operations is naturally very interesting, insofar as it considerably simplifies the manufacturing operations, and where it makes it possible to have a multitude of cavities for each mold, for example at least twenty four cavities per mold (each cavity requiring a unit of the type illustrated in FIG. 12) Once the slider is made by molding, it is conveyed to an automatic laying station, and it is set up very easily thanks to the longitudinal ribs 129, 130 which cooperate with a suitable tool (not shown here) to spread the wings

side of said cursor.

  The molding unit which has just been described is further such that the joint plane is not at a lateral edge 123 or 124 of the elongated central sole 108, so that these lateral edges are free of any burr, which excludes ipso facto any risk of cutting the sails of closure when one exerts a certain pressure on the faces

side of the cursor.

  The invention is not limited to the embodiment which has just been described, but on the contrary covers any variant with

  equivalent means, the essential characteristics indicated above.

Claims (12)

  1 / Slider for bags or bags fitted with a plastic closure with two interlocking profiles, comprising two interconnected lateral wings which define, with an elongate central sole, two convergent passageways for the interlocking profiles, said soleplate being supported in cantilevered by a central separation rib, and having, on either side of said rib, two guiding facets, one of which is associated with the smaller of the two profiles and has an oblique part, characterized by the fact that: the lateral wings (101, 102) of the slider (100) are interconnected by two connecting bridges (103, 104) defining a central recess (120), one of which (103) is integral with the rib separator (105), said bridges having sufficient flexibility to allow automatic placement of said slider by spacing its lateral wings; the separating rib (105) supporting the elongate sole (108) extends into the central recess (120) beyond the connecting bridge (103) which is integral with it and in the median plane (200) of the slider, in order to reinforce the rigidity of the connection between said rib and said sole; the guide facet (115) associated with the smaller of the two profiles has an inclined ramp (115 ', 115 ") extending substantially the entire length of the elongated sole (108), so as to reinforce the rigidity of said sole the other guide side (114) being straight   up to the free end (113) of said sole.   2 / slider according to claim 1, characterized in that the separating rib (105) extends over its entire height,   substantially to mid-length of the central recess (120).   3 / Slider according to claim 1 or 2, characterized in that the separating rib (105) has a thick portion (106) connecting to the connecting bridge (103) which is integral therewith, and extends   by a narrower portion (107) beyond said connecting bridge.   4 / slider according to one of claims 1 to 3, characterized by   the fact that the guide facet (115) associated with the smaller of the two profiles has a two-part ramp (115 ', 115 "), of which a gently sloping portion (115') adjacent to the separating rib (105) , and a steeper portion (115 ") up to the free end (113) of the sole elongated (108).   Cursor according to one of claims 1 to 4, characterized by   the fact that the guide facet (115) associated with the smaller of the two profiles has, beyond the separation rib (105), a substantially constant width up to the free end of the elongate soleplate (108).   6 / slider according to one of claims 1 to 5, characterized by   the fact that the elongated sole (108) is tapered symmetrically with respect to the median plane (200) of the slider, with a free end (113) at a distance   the corresponding end (116) of the cursor.   7 / slider according to claim 6, characterized in that the elongated sole (108) extends from one end (111) of the slider, at the separation rib (105), to a distance from the quarter of the slider length of the other end (116) of said slider, so as to define a common central corridor (119) beyond the end free (113) of said sole.   8 / slider according to claim 7, characterized in that the common central corridor (119) is delimited by facets (121, 122) parallel to the median plane (200) of the slider, formed on the inner side of side wings (101, 102).   9 / slider according to claim 7 or 8, characterized in that the common central corridor (119) has substantially the same   length as the connecting bridge (104) which delimits it superiorly.   Slider according to one of claims 6 to 9, characterized by   the fact that the lateral edges (123, 124) of the elongate flange (108) and the adjacent inner faces (125, 126) of the lateral flanges (101, 102) are inclined at an angle substantially equal to 6 with respect to the plane median (200)   of the cursor, and symmetrically with respect to said plane.   11 / slider according to one of claims 1 to 10, characterized   in that the central recess (120) concerns substantially half the total length of the cursor.   12 / slider according to claim 11, characterized in that the central recess (120) has in section the general shape of a trapezium   isosceles, and admits as plane of symmetry the median plane (200) of the cursor.   13 / slider according to one of claims 1 to 12, characterized   in that it is surmounted by two longitudinal ribs (129, 130) serving to separate the lateral wings (101, 102) with elastic flexion of the two connecting bridges (103, 104) by cooperation with an associated tool, when the automatic laying of said cursor, said longitudinal ribs bordering the central recess (120) and extending to said bridges of link.   14 / slider according to one of claims 1 to 13, characterized   in that it is in the form of a single piece (100) in   plastic material, produced by molding.