MXPA06008542A - Moulded self-gripping hook-in-hook fastening - Google Patents

Abstract

Object, particularly moulded, having at least one surface from which at least one field of hooks projects, particularly through moulding, each hook being constituted by a stem section and a head section projecting laterally from the stem section, the hooks being arranged in rows, characterised in that in at least one row the hooks are arranged according to a cycle constituted by m successive right/left hooks, of which the heads project from the stems in a first direction, and n successive hooks in a second left/right direction, following the m hooks, of which the heads project in a second left/right direction opposing the first direction, whereby m and n are integers such that 1 GBP m(ES) Un objeto, particularmente moldeado, que tiene por lo menos una superficie desde la cual se proyecta por lo menos un campo de ganchos, particularmente a través de moldeado, cada gancho estáconstituido por una sección de tallo y una sección de cabeza que se proyecta lateralmente desde la sección de tallo, los ganchos están distribuidos en hileras, caracterizado porque en por lo menos una hilera los ganchos están distribuidos de acuerdo con un ciclo constituido por m ganchos sucesivos derechos/izquierdos, de los cuales las cabezas se proyectan desde los tallos en una primera dirección, y n ganchos sucesivos en una segunda dirección izquerda/derecha, siguiendo a los m ganchos, de los cuales las cabezas se proyectan en una segunda dirección izquierda/derecha opuesta a la primera dirección, de manera tal que m y n son números enteros de modo que 1 ( m

Description

MOLDED HOLDER OF SELF-TENSION HOOK ON HOOK DESCRIPTION OF THE INVENTION The present invention relates to an object, particularly molded, having at least one surface from which hooks have been molded to form part of a self-retaining fastener, and with a mounting of at least two objects, particularly molded, of this type, wherein the hooks of one of at least the two objects snaps into the hooks of another of at least two objects. A molded object is known in advance from the prior art and in particular from the US patent. No. 5,368,459, with a field of hooks projecting from a face thereof which are molded in a one piece construction with the molded object during processing. This molded object of the prior art has the drawback that the hooks which are manufactured by molding, particularly through ejection of the hook head from a molding cavity, are manufactured with a shape and according to a distribution such that it is not possible to obtain a hook hook fastening, but only a hook fastening in a loop with another object or another part of the object. In fact, These hooks have heads which are relatively flexible in order to allow their separation from the mold and the hook-hook quick-fit connection is not "maintained", in particular it does not resist torsional stresses, because of its relative flexibility. An object of the present invention is to correct the drawbacks of the prior art by making an object, particularly molded, available for the first time, with any shape having a first face with a field of directly molded hooks which can cooperate with another field of hooks of the same type that come from a second object, or another part of the object, for fixing or securing the hook type hook. The fact that this object can be manufactured by molding facilitates large-scale production in a simple manner. According to the invention, the molded object in particular has at least one surface from which at least one field of hooks project directly through molding, each hook being constituted by a stem section and a head section that it projects laterally from the stem section, the hooks are distributed in rows, and is characterized in that at least one of the rows of the hooks comprises at least one succession of hooks of single successive head with right / left direction, of which the heads project from the stems in a first direction, and successive hooks with left / right succession, after the hooks, of which the heads are projected at least in a second left / right direction opposite to the first direction, so that m and n are integers such that 1 < m < n. Preferably, all the hooks have a single head. In this way by providing an alternation of hooks in one direction and then in another, also with lack of symmetry (myn are different from each other) therefore it is possible to snap the hooks of one object with the hooks of another object and This way you get what is called hook hook fastening which works well, although the hooks only have a unique head (ie, a single head projecting from a single side of the stem, and in particular it is not a mushroom head or a double head) and having a shape and dimensions that are made of a material which allows them to separate of the cavities in the form of hooks when deforming slightly at the moment of extraction, and then returning to acquire their shape corresponding to that of the mold. So far, with single head hooks and particularly with hooks that come directly from the molding, it has not been possible to obtain a hook hook fastening, particularly because of a too great flexibility of the hooks. The lack of symmetry seems to ensure that some of the hooks of at least one row snap into the opposite hooks of the grip while the other hooks make contact with the stems of the opposite hooks in order to block the two rows of hooks. the two objects in which they press against each other, in order to avoid, in this way, the relative sliding of the two rows and to ensure the hook hook fastening, which holds well. According to a development of the invention, at least one of the rows also provides a succession of m 'hooks with a single head in the left / right direction and n! hooks at least in a right / left direction, so m 'and n' are integers such that 1 <; m '< n '. By having two inverse sequences in the same row, in this way a male self-retaining body is obtained, whose clamping works better because it is self-centered. According to a development of the invention, the hooks are distributed in rows and columns and in at least one column each m + n columns all the hooks they are oriented in the same direction, and in particular when m = l and n = 2 in a column every three columns, all the hooks are oriented in the same direction. According to a development of the invention, the hooks are distributed in rows and columns in such a way that in a first column all the hooks are oriented in the same first direction, then in a first even number of columns the hooks in each row they are distributed in pairs, the hooks of each pair are oriented back to back in the odd rows / pairs and face to face in the even / odd rows, then in the next column all the hooks are oriented in the same second direction, then again in a second pair of following columns the hooks in each row are distributed in pairs, the hooks of each pair are oriented back to back in the odd / even rows and face to face in the even / odd rows, then again in the next column all the hooks are oriented in the first direction, and so on. In particular, it is preferable for the first direction and the second direction to be opposite directions in order to thereby obtain self-centering during snap-fitting from one male part to another.

According to a development of the invention, the hooks in at least one row are distributed according to a repeat cycle constituted by m single right / left hooks and n left / right hooks. According to a development of the invention, the rows are offset from one another by a number of hooks between 1 and m-n-1. The rows are repeated as a maximum m - n rows and in particular when m = 1 and n = 2, the rows are repeated every two rows, two adjacent rows are deviated from each other by a hook. According to a development of the invention, the hooks are distributed in rows and columns and at least one column each m + n columns all the hooks are oriented in the same direction and particularly when m = 1 and n = 2, in a column every three columns all the hooks are oriented in the same direction. According to a development of the invention, the distance between stems (distance between the stems of hooks at the level of at least one surface) between the two successions of n and hooks (between the hook nes: Lmo of the n hooks and the first of the hooks) is less than any of the distances between stems, between the other two hooks in the row, and in particular this distance is approximately zero According to a development of the invention, the distance between stems, between the two successions of hooks m and n (between the hook nes? Xno of the hooks and the first of the n hooks) is greater than any of the distances between stems, between two other hooks in the row. According to a preferred embodiment, the distance between two rows is strictly smaller than the transverse thickness of the hooks, measured in the direction of the columns, particularly perpendicular to the rows, and preferably is less than half the transverse thickness. The present invention also relates to a assembly consisting of a first object, particularly molded, according to the invention and a second object, particularly molded, according to the invention, the hook fields of the first object are coupled with the hooks of the first object. hook field of the second object in order to fix the first object to the second object. One embodiment of the molded object and one assembly according to the invention will be described below by way of example. Hereby reference will be made to the drawings, in which: Figure 1 shows a box made of thermoplastic material formed by molding, from a surface from which the hooks according to the invention are projected, figure 2 shows, in a perspective view, an intermediate fixing plate, to the rear of which an anchoring element can be fixed, for example a pin in the form of a pine needle, and comprising on its other face a field of hooks according to the invention, figure 3 is a top view of the plate of figure 2, figures 4a and 4b are side views of an assembly of two sections, each having a hook surface, as described in the figures 2 or 3, following the quick adjustment of the front face / front face (figure 4a) or front face / back face (figure 4b), figure 5 is a side view of a section of the plate of figure 2; Figure 6 is a front view of a hook of a hook field of an object according to the invention, Figure 7 is a perspective view of a hook plate having a hook distribution according to another possible embodiment of hooks. the invention, figure 8 is a top view of the plate of figure 7, figure 9 is a side view of the plate of Fig. 7, Fig. 10 shows a side view of the second row from the front of the plate of Fig. 9, Fig. 11 shows a section of a fastener constituted by two plates, according to the invention, Fig. 12a shows a hook with a single head and a single bar-shaped element, and figure 12b shows a hook with a single head and a double rod-shaped element. As can be seen in figures 1 to 4, the hooks project from a surface 2 from a plate of base. The hooks are distributed in rows (CD address), parallel to each other and columns (MD address), parallel to each other. In a given row 4, the hooks 6, 7 and 8 follow each other in succession. The hook 6 is oriented to the right, that is to say, its hook head projects laterally from its stem in the direction to the right of the stem in the drawings, in the direction of the row 4. The hook 7 immediately follows and has a head which projects in a direction to the left, in the direction of the row, in the same way as the hook 8 immediately following in the row. The cycle then starts again with a right hook equivalent to hook 6, then two left hooks equivalent to hooks 7 and 8, and so on. In this case, one has m = 1 and n = 2. In the immediate next row 5 the hooks are distributed according to the same repeat cycle. However, the hooks 6 ', 7' and 8 'of the second row 5 are offset with respect to those 6', 7 'and 8' of the first row 4 by a hook to the left, that is to say in the same row. direction that the orientation of the n hooks (7 and 8 in the case here where n = 2). The hook 7 and the hook 8 'and the equivalent hooks (same reference in the drawings) to these two hooks in the following rows are aligned in a column 10 in which the whole of the hooks 7, 8', etc., of the column are oriented in the same direction. Between two successive columns in which all of the hooks 7, 8 'are oriented in an identical manner, in the odd rows, for example the first row 4, the two successive columns are separated by one or more pairs of hooks (one pair in figure 2, 3 pairs in figure 9), constituting what are called face-to-face hooks (ie, of which the heads are oriented towards each other) while in the odd rows (for example the row 5), the two successive columns are separated by one or several pairs (1 pair in figure 2, 3 pairs in figure 9), which they constitute what are called hooks back to back, that is to say, of which the heads of the hooks are oriented in opposite directions. In the embodiment of Figures 1 to 4, a column in three is a column similar to column 10. In another possible modality which is not shown, a column 10 in two (or three or four, or also in a random manner) ) may be replaced by a column of the same type but having its hooks oriented in the other direction. Between two successive columns 10, in a row 4 in two there are two hooks 8 and 6 which are oriented in opposition and have a distance between stems measured on the surface 2 along the row 4 which is approximately equal to zero. Between two successive columns 10 in the other row in two, there are two hooks 6 ', 7' facing each other. The distance (measured on the surface 2 by the distance between the stems along the row) between two hooks 7 and 8 oriented in the same direction and that follow each other in a row, is approximately equal to half the distance between two hooks 6 and 7 of which the heads are oriented towards each other. The distance A between two successive hooks 7, 8 'in a column is smaller than the dimension B of the heads of the hooks measured in the direction of the column, preferably less than B / 2. In Figures 4a and 4b one can see how the hooks of one plate are snapped or snapped into the hooks of another plate in order to generate the self-retaining clip hook hook. In Figure 4a, the upper plate 21 is identical to the lower plate 20, which has simply been rotated through 180 °. In the first row 4a a hook 8 of a first row of the lower plate 20 is snapped with its head into the head of a hook 7 of the upper plate 21, a hook 7 of the first row 4 of the plate 20 bottom snaps with its head inside the head of a hook 8 of the first row of the top plate, and a hook 6 of the first row 4 of the bottom plate makes contact with the stem head of a hook 8 of the upper plate. In the same way, a hook 6 of row 4 of the upper plate makes contact with the stem head of a hook 8 of the lower plate. In the second row 5, a hook 8 'of the row of the lower plate 20 makes contact with the stem head of a hook 6' of the upper plate 21, a hook 7 'of the row 5 of the lower plate 20 adjusts under pressure with the head inside the head of a hook 8 'of the row 5 of the upper plate, and a hook 6' of the row 5 of the plate bottom makes contact with the stem head of a hook 8 'of the upper plate. In the same way, a hook 6 'of the row 5 of the upper plate makes contact with the head of the stem of a hook 7' of the row 5 of the lower plate, a hook 71 of the row 5 of the upper plate makes contact with the stem head of a hook 6 'of the lower plate and a hook 8' of the row 5 of the upper plate is press fit with the head inside a hook 7 'of the row 5 of the lower plate. In the case of figure 4b, there is an upper plate which is also rotated 180 ° with respect to the lower plate but which has also been rotated on itself in such a way that the front row (row 4 on the figure 2) is now on the other side of the plate, which has been replaced by the rear row (row 5 in figure 2). In this configuration, the hooks 6 of row 4 of the lower plate are press-fitted with their heads on the hooks 7 'of the row 25 of the upper plate. The hooks 7 of the row 4 of the lower plate contact the stem heads of a hook 7 'of the row 25 of the upper plate. The hooks 8 of the row 4 of the lower plate contact the heads of the stems of a hook 8 'of the row 25 of the upper plate. The hooks 6 'of the row 25 of the plate above make contact with the heads of the stems of a hook 6 of row 4 of the lower plate. The hooks 8 'of the row 25 of the upper plate make contact with the stem of a hook 7 of the row 4 of the lower plate and the hooks 7' of the row 25 of the upper plate make contact on the hooks 6 of row 4 of the lower plate. In the same way that the hooks 6 'of a row 5 of the lower plate press fit with the heads on the hooks 8 of the row 24 of the upper plate. The hooks 7 'of the row 5 of the lower plate make contact with the heads of the stems of a hook 8 of the row 24 of the upper plate. The hooks 8 'of the row 5 of the lower plate are press fit with the heads on the head of a hook 6 of the row 24 of the upper plate. The hooks 6 of the row 24 of the upper plate are press fit with the heads on the head of a hook 8 'of the row 5 of the lower plate. The hooks 7 of the row 24 of the upper plate make contact with the stem of a hook 8 'of the row 5 of the lower plate. The hooks 8 of the row 24 of the upper plate are fastened with their heads on the head of a hook 6 'of the rows 5 of the lower plate. The rows are repeated according to a cycle of two. In Figure 2, row 4 (row of the front face) is the innermost row. Row 5 is the next row. It is offset by a row with respect to row 4, the row which follows row 5 is identical to row 4 and then the next row is identical to row 5, and so on. Row 25 is the outermost row (row of the back face). It is identical to row 5, row 24 is the row that precedes row 25. It is identical to row 4. In figures 7 to 10 another mode is shown. As in the previously described embodiment, row 4 (first row) which is located towards the front in figure 7 is provided by a succession of m = 1 right hooks (row 6) and n = 2 left hooks (row 6). hooks 7 and 8). However, a repetition of this succession is not provided after said cycle. On the other hand, in this modality another succession of m '= 1 left hooks (hook 106) and of n' = 2 right hooks (hooks 107 and 108) is also provided. In the odd rows (for example the first row), the cycle of repeating the hooks in this way is constituted by a left hook 7, followed by three pairs of hooks back to back, then a right hook 107, then three pairs of hooks. hooks back to back, the cycle is repeated afterwards with a left hook.

In the row pairs (for example in the second row), the cycle is identical with the exception that the pairs of hooks are face-to-face pairs. According to another possible embodiment of the invention, a number of pairs of hooks can be provided, which varies between two columns with constant hooks (there is a question of the columns in which the totality of the hooks are oriented in an identical manner). that this variation may be in accordance with a law, for example by increasing by 1 after each constant column or randomly. In the same way one can have a variation of the orientation of the constant columns. It should be noted that in the case of the embodiment of Figures 7 to 10, the even rows are not even rows deviated with respect to those of one or more hooks. In Figure 11 one can see, on a larger scale, a section of the fastener comprising two plates. As can be seen, the free space j is shown between the hook head and a hook stem in the case where the hook head of one of the two plates contacts the stem of a hook of the other plate. The different dimensions, configurations and clamping forms are selected in such a way that the residual free space J is smaller than the dimension E. This dimension E is the interval between two clamping axes of two hooks which are coupled to each other, the axis of attachment of a hook is the vertical line or perpendicular to the base of the plate and passes via the lowest point of the hook head. In addition, the width L2 of a column of hooks measured at the level of the hook heads is always greater than the distance Ll between two hook heads of two successive columns. Finally, the separation of the two plates is such that the distance between the hooks which are coupled to each other in the vertical direction P is always greater than zero. In figure 6 a hook according to the invention is shown in a longitudinal section. In the plan view of the drawing a hook curve 60 is defined in this way. For the hook 7, the axis 62 (imaginary) of the hook is defined so that it is in a straight line perpendicular to the lower face 2 and passing via the middle part of the base 61 of the hook. The straight (imaginary) boundary line of the hook head is defined as the first line 63 parallel to the axis 62 of the hook, starting from axis 62 and deviating to the right (or to the left, respectively) which cuts the curve 60 wrapping in two points (64 and 65). The section of the hook on the outside of line 63 straight and above point 64 of denominates on head 40 of the hook. The stem 50 of the hook is defined as the section of the hook which is located on the other side of the segment (64, 65) of the delimitation line 63. Preferably, the stem 50 is enlarged (its width in the plan view of Figure 6 decreases) from the bottom to the top of the hook. From a top view, the hook has a rectangular shape, of which the length (horizontal width of the stem in the plan view of figure 6) or the thickness (according to the perpendicular direction in relation to figure 6) decreases from the base to the head. However, one can also have a constant thickness. In the same way, the head of the hook has a rectangular shape as seen from the top, with a constant thickness or a thickness that decreases the cross section from the bottom to the top. For the head 40, the greatest thickness in height is defined as constituted, measured along the axis 62 of the hook, between the difference that occurs between the maximum height HM of the head (distance from the lower face 2 to the point 75). higher, measured parallel to axis 62) and the minimum height Hm of the head (the distance from the lower face 2 to the lower point 76 of the head of the hook) . As regards the clamping height Ho, this is equal to the distance along the axis 62, between the lower face 4 and the highest point 77 of the section of the wrapping curve defining the lower surface of the head 40. The profile of the head is defined in this way as constituted by the ratio (HM-Ho) / (HM-Hm). In the upper limit this profile is equal to 1, which corresponds to a horizontal hook head or to one which is oriented upwards (in these two cases, one has Hm = Ho). In the case of hooks that come directly from the molding of a very rigid object, it is preferable that the profile of the head is greater than 0.55, particularly greater than 0.60, preferably larger than 0. 80 and much more preferably greater than 0.9. On the opposite side of the head, the section of the wrapping curve defining the stem is constituted by the arc of a circle and the straight line 84, which is inclined with respect to the axis 62 approximately as much as the cut of the line 63 of delimitation. The angle of inclination is preferably between 20 ° and 45 °. The section of the envelope that defines the head is constituted by the upper arc of a circle (which defines the upper surface of the head) • and a lower arc of a circle (which defines the lower surface of the head) and a. intermediate arc of a circle. The radius of the upper arc of a circle is preferably between 0.10 and 0.5 mm, for example 0.32 mm, the radius of the lower arc of a circle is preferably between 0.04 and 0.25 mm, for example 0.12 mm, and the intermediate arc of a circle preferably it is between 0.01 and 0.10 mm, for example 0.06 mm. Preferably, the section of the wrapping curve defining the head does not include an inflection point (its first derivative function is continued at any point). The absence of a "pointed" section in the head of the hook helps the separation of the mold during its elaboration. The height HM is preferably between 0.25 and 2 mm, for example it is equal to 1.43. The thickness of the plate 2 is preferably between 0.2 and 1.5 mm, for example 0.8 mm. The height HM is preferably between 0.1 and 1. 05 mm, for example, 0.91 mm. The height Ho is preferably between 0.15 and 1.25 mm, for example, 1.12 mm. The width at the level of the plate 2 of the stem is preferably between 0.2 mm and 1.5 mm, for example O .8 mm. The width of the stem at the height of the intersection of the wrapping curve with the boundary line to the right (or to the left, respectively) is preferably between 0.11 and 0.7 mm, for example 0.45 mm. The thickness at height HM-Ho is preferably between 0.10 and 0.50 mm, more preferably between 0.20 and 0. 40 mm, for example 0.32 mm. The thickness at the height of the base is preferably between 0.1 mm and 4 mm, more preferably between 1 and 2 mm. . The ratio of thickness to height HM-Ho over the thickness at the height of the base is less than 1, preferably less than 0.5, more preferably less than 0.3, particularly less than 0.2. The appropriate thermoplastic materials - in particular the hooks that come from the molding of a very rigid object - are polypropylenes or polyurethanes, for example, as the polypropylene one can select an unsaturated polyester mixture consisting of a 50% homopolymer and 50% copolymer, which it has a melt flow index of 22 g / 10 nm and a flex modulus of 897 MPa (130,000 psi) to 1035 MPa (150,000 psi). Other possible materials include a polypropylene of Atofina, PPC 5660 having a melt flow index of 7 and a flex modulus of 1207 MPa (175,000 psi), BP Amoco polypropylene copolymers (Acc.lear 8949 and Acctuf 3934X impact copolymer) having Melt flow rate in the molten state from 35 to 100 and bending modules from 1310 MPa (190,000 psi) to 1724 MPa (250,000 psi); polystyrenes, acrylonitrile butadiene styrenes, high density polyethylene, linear low density polyethylene and polycarbonate. The melt indexes are between 1 and 100 and the flexural moduli are between 207 MPa (30,000 psi) and 7863 MPa (1,140,000 psi), preferably between 690 MPa (100,000 psi) and 6898 MPa (1,000,000 psi), more preferably between 2069 MPa (300,000 psi) and 6898 MPa (1,000,000 psi). Resins other than resins with a polypropylene base which may be suitable are impact polystyrene, acrylonitrile butadiene styrene, nylon, high density polyethylene, linear low density polyethylene, polycarbonate and olefinic thermoplastic resins. Also possible are polypropylenes reinforced with long glass fibers having a very high flexural modulus (resin 30YM240 / 10010 having a flexural modulus of 5904 MPa (850,000 psi) and a resin 40YM240 / 10010 having a flexural modulus of 7863 MPa (1,140,000 psi) sold by StaMax). In this case, the long glass fibers do not migrate into cavities (which are too small or too thin for long fibers to penetrate) and thus a rigid plate is obtained and, nevertheless, the hooks have sufficient flexibility to expel themselves from the cavities The term "rigid" is used to describe an object which can not be bent in a reversible manner beyond a curvature angle of 5o. The object can be, for example as shown in Figure 1, a flexible plastic box designed, for example, for storing food products, having a lower section 100 and a upper section or lid 200. A tongue 300 projects from the lower section 100 and comprises a hook field, according to the invention, as shown, for example in Figure 2. In the same way, the edge 400 of the lid comprises a field of hooks according to the invention, which, by means of press fit on the hooks of the tongue 300, facilitate the clamping of the box. The object, particularly molded, for example the box, can be made of a plastic material or a thermoplastic, rigid or flexible material. In particular, a ribbon can be seen, from a face of which hooks are projected which are formed by molding in a cavity roller as described in the European patent application 1042971 in the name of the applicant. In this case, the flexible tape with hooks is placed on the object or objects that one wishes to provide with a hook hook fastening, according to the invention. The fastener can also be constituted by two flexible tapes, so that the hooks projecting from one face of each of them which have been shaped by molding in a cavity roller or by extrusion, according to a described procedure in the US patent number A 4056593. Several modalities have been described in this application, each with a certain number of characteristics. It is unnecessary to mention that the modalities constituted by a combination or a selection of the totality of the characteristics of two or more than two of the described modalities should also be considered as constituting part of this description.

- Translation of the text in the drawings Figure 4a. Pressure adjustment connection Front face / front face Figure 4b Pressure adjustment connection Front face / front face Figure 9 Reference axis Figure 11 Preferably: Distance E always > residual space J Width L2 always > width Ll P always > 0 Example: E = 0.04 J = 0.03 Ll = 0.49 L2 = 0.58 P = 0.02

Claims (18)

1. Object having at least one surface (2) from which at least one field of hooks (6, 6 ', 7, 7', 8, 8 ') is projected, each hook being constituted by a section (50) of stems and a section (40) of head projecting laterally from the stem section, the hooks are distributed in rows (4, 5, 24, 25), characterized in that in at least one row the hooks are constituted by minus a succession of m hooks (6; 61). successive with a single head in the right / left direction, of which the heads project from the stems in a first direction, and successive hooks in the left / right direction, following the hooks of which the heads are projected so less in a second left / right direction opposite the first direction, so that myn are integers such that 1 < . m < n.

2. Object as described in claim 1, characterized in that all the hooks have a single head. Object as described in claim 1 or 2, characterized in that at least one row also provides a succession of m 'hooks with a single head in the left / right direction and n1 hooks in at least one right / left direction, so m 'and n' are integers such that 1 < . '< ? ' 4. Object as described in claim 1, 2 or 3, characterized in that the hooks are distributed in rows and columns and in at least one column of single-head hooks all the hooks are oriented in the same direction. Object as described in one of claims 2 to 4, characterized in that the hooks are distributed in rows and columns such that in the first column all the hooks are oriented in the same first direction, then in a first even number of following columns the hooks in each row are distributed in pairs, the hooks of each pair are oriented back to back in the odd rows / even rows, and face to face in the even rows / odd rows, then in the next column all the hooks are oriented in the same second direction, then again in a second even number of following columns the hooks in each row are distributed in pairs, the hooks of each pair are oriented back to back in the odd rows / even rows, and face to face in the even rows / odd rows, then again in the next column all the hooks are oriented in the first address. 6. An object as described in claim 5, characterized in that the first address and the second address are opposite directions. 7. An object as described in claim 5 or 6, characterized in that the first even number is equal to the second even number. Object as described in one of claims 1, 2, 4, 5 or 7, characterized in that the hooks in at least one row are distributed according to a repetition cycle constituted by m right / left single head hooks and n hooks at least left / right. 9. Object as described in one of claims 1 to 8, characterized in that the rows (4, 5; 24, 25) are offset from one another by a number of hooks between 1 and m-n-1. 10. An object as described in one of claims 2 to 9, characterized in that the rows are offset with respect to one another. Object as described in one of claims 2 to 10, characterized in that the distance between stems (distance between the hook stems at the level of at least one surface) between the two successions of n and hooks (between the hook nes? of the n 'hooks and the first of the hooks) is less than any of the distances between stems, among other two hooks in the row, and in particular this distance is approximately zero. 12. Object as described in one of claims 2 to 11, characterized in that the distance between stems, between two successions of m and hooks (between the hook nes m of the hooks and the first of the n hooks) is greater than any of the distances between stems, between two other hooks in the row . Object as described in one of claims 2 to 12, characterized in that the distance between the two rows is strictly smaller than the transverse thickness of the hooks, measured in the direction of the columns, particularly perpendicular to the rows, and preferably it is less than half the transverse thickness. An object as described in .. one of claims 1 to 13, characterized in that the stalk of the hooks is enlarged, in particular the lateral surface (84) on the opposite side in the head (40) is inclined with respect to the vertical to the surface (2). 15. Object as described in one of the preceding claims, characterized in that it comprises two hook fields distributed so that they are capable of adjusting to pressure between them in order to generate a grip of the object. 16. Object as is. described in one of the preceding claims, characterized in that it comprises a flexible tape, from a face from which the hooks project. 17. Object as described in one of claims 1 to 15, characterized in that the object is molded, particularly in a rigid material. 18. Assembly consisting of a first object, particularly molded. according to one of claims 1 to 17, and a second object, particularly molded, according to one of claims 1 to 11, the hook fields of the first object are coupled with the hooks of the field of the hooks of the second object , in order to fix the first object to the second object.