EP1190642A1 - Backpack with an angular damper between the back of the backpack and the shoulder straps and/or the belt unit - Google Patents

Abstract

A shoulder of the female piece penetrates a groove of the elastomeric strip such that angular pivoting of the strap assembly relative to the back of the bag as caused by relative movement of user body is impeded. The strip is fixed to the rear face of the male piece.

Description

The present invention relates to an improved backpack whose system for hanging the suspenders and / or the belt assembly on the back or the frame of the bag is equipped with an angular pivoting damper.

A backpack consists of a container or bag itself, a set of straps allowing the bag to be attached to the user's shoulders, a belt assembly for attaching the bag around the waist of the user, said straps and belt assemblies generally attached to the back of the bag proper and possibly on a stiffening frame.

Document EP.0.260.959 has already proposed a system hooking between the back of the bag and the shoulder strap assembly which allows pivoting angular of the set of straps relative to the bag itself. This system attachment includes a male part which is integral with the strap assembly and which has a prominent fixing head and a female part secured to the back of the bag, having a central recess and means for blocking the head fixing once it has entered the central recess. In this case the male part has a kind of stud formed of several flexible branches terminated by growths, while the female part has a hole terminated by an annular shoulder. The respective dimensions of the stud and the hole are such that the stud penetrates inside the hole thanks to the bending of the branches which compose it with a locking of the two parts thanks to the extension prominences in the annular shoulder. Thus the male part can pivot in all directions around the pivot axis, i.e. the axis of the stud which allows the set of straps to follow the movements specific to the user when moving.

In a particular embodiment of document EP.0.260.959, it is planned to limit the angular pivoting of the male and female parts thanks to a kind of lug which is provided on the male part which penetrates into a groove made in the female room. The extreme amounts of the groove delimit the stroke maximum angular between male and female parts.

However in this document there is no desire to amortize the relative displacement of the two parts with respect to each other between the two stops. There may therefore be, depending on the specific movements of the user jerks on the shoulder strap assembly when the relative angular displacement of two pieces exceeds the maximum angular travel provided for and delimited by the stops.

In the document EP.0.628.265, a system is also described of attachment between the back of a backpack and a belt assembly, system which provides angular pivoting of the belt assembly relative to the back of the bag thanks to a fairly complex set of parts. In this document there is provided a system of stops delimiting the maximum angular travel and moreover a set flexible tabs, one end of which is securely attached to a workpiece secured to the belt assembly while the other free end penetrates into notches provided in a piece secured to the back of the bag. When pivoting angular, the tongues are made to deform according to the angular position adopted. Although this is not explicitly stated in the text of this document, we can think that the deformation of the tabs is not done without exert a certain force, said force therefore opposing the angular pivoting. It should be noted that the presence of stops is essential, failing which the end free flexible tabs could come out of the notches if swiveled angular of too great amplitude.

The object of the present invention is to provide a backpack comprising a hooking system with angular pivoting between the back of the bag and the assembly suspenders (and / or belt) which does not require the presence of stops intended for delimit the maximum stroke during said pivoting and which has a progressive damping of the forces brought into play during this pivoting.

This object is perfectly achieved by the backpack of the invention. This one comprises in a known manner a container or bag proper, a set shoulder straps for attaching the bag to the user's shoulders, a belt set for attaching the bag around the waist of the user and a hanging system the set of straps (and / or belt) on the back of the bag, said system hooking comprises a first piece integral with the strap assembly (and / or belt) and a second part secured to the back of the bag, said parts cooperating with each other to allow the pivoting attachment of the first and the second piece, along a pivot axis perpendicular to the back of the bag.

a) au moins un élément en élastomère solidaire d'une des deux pièces,

b) et un moyen d'appui, solidaire de l'autre pièce et venant en prise lors du pivotement sur l'élément en élastomère, en sorte que , lors du pivotement le moyen d'appui provoque une déformation de l'élément élastomère qui s'oppose audit pivotement.

Typically, according to the invention, the attachment system comprises:

a) at least one elastomer element secured to one of the two parts,

b) and a support means, integral with the other part and engaging during pivoting on the elastomer element, so that, during pivoting, the support means causes a deformation of the elastomer element which opposes said pivoting.

The angular pivoting of the strap (and / or belt) assembly relative to on the back of the bag causes the elastomer element to deform in the area adjacent to the drive means in the direction of rotation. So there is no, in the attachment system of the invention, a stop delimiting the stroke maximum angular rotation. It is the faculty of deformation of the element in elastomer which will absorb the forces brought into play during the relative movements of the body of the user and therefore of the set of suspenders (and / or belt) which follows these movements. According to the relative position and the structure of the elastomer element and of the first and second parts, the deformation may be of the type by pr ession, by traction, by torsion, by shearing or by bending.

The choice of elastomer is determined according to the volume of the bag and therefore the average weight supported by said bag so that the angular pivoting is between -5 and + 5 ° compared to a normal position.

Under the generic name of elastomer, it should of course be understood not only synthetic elastomers but also rubbers. Of preferably, a vulcanized elastomer or a thermoplastic is used elastomer classified as Shore A hardness.

The support means may be of a different nature; it can be a way purely mechanical or by an adhesive means In the latter case, for example the two opposite faces of the elastomer element are bonded to the first and the second pieces; the relative pivoting of the two parts causes deformation by shear in the thickness of the element. However, there are risks tearing of the plate, in use. Thus a mechanical means is preferred.

In a mechanical embodiment, the elastomer element is fixed by two anchor points on the rear face of the first part and present at minus a recessed area between the two anchor points; additionally the front side of the second part has a protruding lug, said lug penetrating so fitted in the hollow area of the elastomer element, when the two parts are hung.

The angular pivoting of the strap (and / or belt) assembly relative to on the back of the bag causes deformation by compression of one of the two zones of the elastomer element between the recessed area and the two points anchor, according to the direction of rotation.

Preferably, the elastomer element comprises at least one rib and the lug is in the form of a long shoulder capable of engaging in the corresponding rib, the ribs and the shoulders being arranged radially with respect to the pivot axis. Thanks to this arrangement particular, we have a larger contact surface between the element in elastomer and lug, which allows a uniform distribution of the deformation of the elastomer element during pivoting.

Advantageously, the elastomer element is in the form of a annular or partially annular band, centered on the pivot axis; of plus the attachment system has two diametrically opposed assemblies, each consisting of one or more recessed areas, possibly of ribs radial, and one or more pins, possibly elongated shoulders.

This particular arrangement makes it possible to distribute the two sets of forces brought into play during compression of the elastomer strip. Of preferably the two sets in question are arranged symmetrically by relative to the vertical axis (DD ') of the bag, so as to obtain a construction perfectly homogeneous and symmetrical.

Preferably the first part, integral with the strap assembly (and / or belt), is a male part with a fixing head which projects relative to the rear face of said piece, and the second piece, integral with the back of the bag, is a female part with a central recess opening on its face before, said male and female parts cooperating with each other to allow the pivoting attachment of the male part to the female part, along an axis of pivot corresponding to the axis of the fixing head.

Preferably the fixing head is mounted to rotate freely relative to the male part in a housing open on both sides of the male part; she is terminated on one side by a manipulation tab accessible to the user by the opening giving (from the front face of the male part) into the housing and the other side by the T-shaped hooking part; more the central recess of the female part is bordered by two lips blocking the two branches of the T after penetration of the attachment part of the fixing head into the recess and rotation of the manipulation tab by a determined angle, preferably 90 °. This particular arrangement allows the attachment of male and female parts without having to rotate said parts relative to each other, pivoting which would have been difficult if not impossible due to the presence of the pins at the interface between the two said pieces. Thanks to the possibility of rotation of the fixing head in its housing, it suffices to carry out the precise positioning of the two parts one relative to the other, the pins being placed in the hollow areas of the elastomer band, with T-shaped hooking part of the head fixing which enters the recess of the female part, then perform a 90 ° rotation of the manipulation tab to obtain locking in position final male and female parts.

In this case, advantageously, the housing of the fixing head comprises internally a stop and snap system allowing on the one hand limit the rotation of the handling tab to a determined angle preferably 90 ° and on the other hand to ensure a certain blocking of the head in fixing when it reaches the two positions separated by said angle, namely the first in the position for inserting the front part of the fixing head into the recess and the second in the locked position, after rotation.

In order to facilitate the centering of the two male and female parts and also in order to distribute the shear forces between the two said pieces when wearing of the bag, preferably the male and female parts has two portions circular, both centered on the pivot axis, one being in relief and the other hollow, able to fit one into the other. Preferably the portion circular hollow is formed in the female part and the circular portion in relief is formed in the male part.

In a preferred embodiment, the second part, in particular the part female, is integrated in the stiffening frame of the backpack; preferably it has on its height a plurality of superimposed elements similar to first parts, especially female parts, which allows adjustment in height of the positioning of the shoulder strap assembly (and / or belt) relative to the bag.

• La figure 1 est une vue en plan du dos d'un sac illustrant l'état de la technique,
• La figure 2 est une vue en plan du dos d'un sac équipé d'une pièce femelle conforme à l'invention,
• La figure 3 est une vue en plan de la face arrière d'une pièce mâle conforme à l'invention,
• La figure 4 est une vue en coupe longitudinale des pièces mâle et femelle assemblées selon l'axe IV-IV des figures 2 et 3, non encore accrochées,
• Les figures 5 et 6 sont des vues respectivement en perspective et de dessus d'une bande annulaire en élastomère,
• La figure 7 est une vue en plan du dos d'un sac équipé de la bande des figures 5 et 6, avec la patte de manipulation accessible et,
• La figure 8 est une vue en plan partielle d'une armature de rigidification d'un sac pourvue d'une pluralité de pièces femelles,
• La figure 9 est une vue en perspective d'une tête de fixation et
• La figure 10 est une vue en plan d'un système d'accrochage à deux tendeurs.

The present invention will be better understood on reading the description which will be given of a preferred embodiment of a backpack whose shoulder strap assembly is secured to the back of the bag by a hooking system angularly pivoting with a elastomer damper, illustrated by the attached drawing in which:

• FIG. 1 is a plan view of the back of a bag illustrating the state of the art,
• FIG. 2 is a plan view of the back of a bag fitted with a female part according to the invention,
• FIG. 3 is a plan view of the rear face of a male part according to the invention,
• FIG. 4 is a view in longitudinal section of the male and female parts assembled along the axis IV-IV of FIGS. 2 and 3, not yet attached,
• FIGS. 5 and 6 are respectively perspective and top views of an annular elastomer strip,
• FIG. 7 is a plan view of the back of a bag fitted with the strip of FIGS. 5 and 6, with the manipulation tab accessible and,
• FIG. 8 is a partial plan view of a stiffening frame of a bag provided with a plurality of female parts,
• FIG. 9 is a perspective view of a fixing head and
• Figure 10 is a plan view of a fastening system with two tensioners.

The backpack 1 of the prior art constituted by the document WO.00 / 19863 comprises a bag proper 2, a set of straps 3 and a belt set 4. The strap set 3 is, in this case, composed of a monobloc element of scapular supports 5 and two carrying straps 6 connecting in the upper part the two lateral zones of the monobloc element 5 at the bottom of the bag proper 2. The attachment of the bag proper 2 and the element monobloc of scapular supports 5 is done at the level of the central zone 7 of said monobloc element 5, with a certain pivoting capacity of said element monobloc 5 relative to the back 8 of the bag, along arrow F, the pivot axis being perpendicular to the back of the bag. In the example illustrated in the document above, this pivoting capacity is obtained thanks to the natural deformation of the flexible material which constitutes the back of the bag. When the fixation is obtained in especially by sewing, to limit this natural deformation, it is planned to stiffen the portion of the back of the bag which is close to the attachment area, for example by sewing a strap 9 transversely to the upper part of the back, at short distance from the fixing area.

The present invention relates to a system for fixing or hanging the shoulder strap assembly (and / or the belt assembly) on the back of the bag which is not made by sewing and whose angular pivoting is not obtained by natural deformation of the flexible material constituting the back of the bag, this deformation which may entail risks of alteration or even tearing of said material.

To do this, the invention implements a fastening system which comprises two separate parts, in the example illustrated it is a male part 10 and a female part 11. The male part 10, which is integral with the strap assembly 12, has a fixing head whose median axis G, perpendicular to the back 26 of the bag, will constitute the angular pivot axis. The female part 11, which is integral with the back 26 of the bag 14, has a central recess, 15 into which the fixing head 13 can penetrate, as well as means for blocking said head once it has penetrated, said blocking not preventing the angular pivoting ability of the male part 10 relative to the female part 11. Such a fastening system is already known from document EP.0.260.959. Typically, the attachment system of the invention further comprises at least one elastomer element which acts as a shock absorber during the angular pivoting of the strap assembly 12 relative to the back 26 of the bag 14. In the illustrated example, the elastomer element is a strip 16 which is fixed to the rear face 10 a of the male part by two anchoring points. More specifically, the strip 16 is embedded in a housing 18 hollowed out in the rear face 10 a of the male part. In addition in the bottom of this housing 18 are provided two anchoring pads 17, 17 'able to cooperate by fitting with recesses or recessed portions formed in said strip 16. In addition the strip 16 has a groove 19 located substantially equidistant from the two studs 17, 17 '. This groove 19 is shaped to receive exactly a transverse shoulder 20, projecting from the front face 11 a of the female part 11 when the male 10 and female 11 parts are hooked to each other, the two faces 10 a and 10 b being applied against each other. To facilitate their positioning in accordance, the rib 19 has a V-shaped cross section, with two divergent oblique side walls 19 a , 19 b , and a flat base 19 c ; the transverse shoulder 20 has the complementary configuration.

The angular pivoting of the strap assembly 12 relative to the back 26 of the bag, caused by the relative movements of the user's body, is partly prevented by the penetration of one shoulder 20 of the female part 11 into the groove 19 of the elastomeric strip 16. More precisely, this pivoting is braked and cushioned by the compression of the part of the elastomer strip 16 located between the groove 19 and the stud 17 in the direction of rotation according to arrow H, while between the groove 19 and the other pad 17 'the elastomeric material will eventually deform by traction and elongate. Depending on the forces involved in the relative movements of the user's body, the pivoting will therefore be more or less important, knowing that the damping role of the elastomer strip will be depending on its technical characteristics and also on the distance separating the grooves 19 from the pads 17.17 ', that is to say of the amount of elastomer likely to be compressed. It should be noted that there is an elastic return, in the sense reverse of the two parts, upon the release of the forces involved, due to the decompression of the elastomer.

In the preferred example illustrated in FIG. 3, on the same almost annular strip 16, two assemblies have been arranged, symmetrically with respect to the median plane DD 'of the bag passing through the pivot axis G, each assembly comprising the radial groove 19 as well as the two 17,17 'anchor pads. The part of the strip 16 extending between the two middle anchor points 17 'does not play an active role as regards the damping of the angular pivoting. However, it is used to allow the user to see that his set of straps does indeed include an elastomeric cushioning strip, thanks to a window made in the male part 10 and which reveals part of said strip on the front face. 10 b of said male part 10, that is to say the face which is visible and accessible to the user when the strap assembly 12 is mounted on the bag.

• sur la première face , les deux jeux de parties actives d'amortissement respectivement 33,34 , (à droite) et 35,36 (à gauche) séparées par les rainures 37,37',
• sur la seconde face , les deux parties de repérage 30,30' disposées entre deux parties actives 33,35 et 34,36.

The elastomer strip 29 which corresponds to FIGS. 5 to 7 differs from that which is illustrated in FIG. 3 in that it has an annular shape and in that there are two oblong marking parts 30, 30 'visible by two windows 31.31 '. More precisely (FIG. 5) the elastomeric band 29 comprises a totally annular portion 32 of small thickness, and on either side and in elevation relative to this annular portion 32:

• on the first face, the two sets of active damping parts respectively 33.34, (on the right) and 35.36 (on the left) separated by the grooves 37.37 ′,
• on the second face, the two locating parts 30, 30 ′ arranged between two active parts 33, 35 and 34, 36.

In Figure 6, we can see the recesses 38 formed towards the ends active parts opposite the grooves and opening onto the second face, recesses serving as housings for the anchor pads 17,17 '.

In addition to the tracking function through the windows 31, 31 ', the parts of marking 30.30 'which are fitted in two diametrically opposite cavities formed in the male part are used to hold the elastomeric band in position 29 on said male part.

Referring to Figures 3 and 4, the fixing head 13 is mounted rotatably in a housing 21 formed in the male part 10, this housing being open on the two rear faces 10 a and front 10 b of the male part 10; the first opening allows the passage of the protruding part 13 a for attachment, the cross section of which is T-shaped, while the second opening leaves accessible a manipulation tab 13 b allowing the user to carry out himself the 'attachment of the two male 10 and female 11 parts, that is to say the attachment of the strap assembly 12 to the back 26 of the bag. The rotation of the manipulation tab 13 b , of elongated shape, is at an angle of 90 ° maximum between two extreme positions: a first position (FIG. 7) corresponding to the introduction of the projecting part 13 a into the central recess 15 and a second position, obtained after the 90 ° rotation, corresponding to the attachment of the male 10 and female 11 parts. This attachment is obtained by a set of two stops formed in the housing 21.

In the example illustrated in FIG. 9, the fixing head 40 is equipped, for each extreme position, a stop 41 and an audible click of positioning 42. The two stops 41 carried by the fixing head 40 cooperate with the play of the two stops formed in the housing 21. With regard to the pawl 42, it is formed on the periphery of the circular support 43 on which is fixed the handling tab (not visible in figure 9). Along the periphery from this circular support 43 are provided two semi-circular notches 44 which delimit two tabs 45. The two pawls 42 are formed by two radial projecting portions of the two tongues 45. The circular support 43 is mounted in a housing in which two grooves are provided which can serve as slots for the two pawls 42. The configuration of the slot in which is placed the circular support 43 is such that during the rotation of the fixing head from one extreme position to the other, the pawl 42 is pushed radially by the face internal of the housing by the deflection of the tongue 45 towards the inside of the notch 44. Thus to pass from one extreme position to the other, the rotation of the manipulation leg can only be done by exerting some necessary force to get this flexing of the two tabs 45, until the two tabs relax when the two pawls penetrate their housing respective causing a characteristic noise, which alerts the user that the correct positioning is obtained.

The installation of the strap assembly 12 on the back 26 of the bag 14 is done by applying the rear face 19 a of the male part 10 carried by the strap assembly 12 on the front face 11 a of the female part 11 carried on the back 26 of the bag by penetrating the protrusion 13 has T of the fixing head 13 in the central recess 15 formed in the female part 11 and rotating 90 ° the handling tab 13 b. On either side of the recess 15 are provided two locking lips 25 under which the two branches 13 c of the T-shaped protruding part 13 a get stuck during the 90 ° rotation of the fixing head 13 by through the handling tab 13 b .

In order to facilitate the centered positioning of the two male parts 10 and female 11, two circular portions are also provided, respectively projecting and recessed on the front faces 10 a and 11 a of said parts 10 and 11, the two said circular portions being centered on the pivot axis G. In the example illustrated in FIG. 4, it is the male part 10 which supports the protruding portion 10 c while it is the female part 11 which presents the recessed portion 11 vs.

The elastomer strip 16 can optionally be replaced in the event of deterioration or wear, its placement being very easy because it is only to fit it on the pads 17,17 ', said strip being wedged laterally in its housing 18 (Figure 3).

The elastomeric strip 16 can be made of natural or synthetic rubber or also in synthetic elastomer, of the polyisoprene type, butadiene copolymer styrene, polybutadiene, ethylene-propylene copolymer, terpolymer ethylene, propylene and diene or isoprene copolymer and isobutylene, without this list being exhaustive. In a specific example of realization, SEBS (styrene-ethylene-butadiene-styrene) was used as elastomer marketed under the brand SANTOPRENE, having a shore A hardness of 60.

The distance between the groove 19 and the studs 17 was of the order of 15mm for a strip having a width of around 10mm and a thickness of around 10mm in the active compression zones between the groove 19 and the studs 17, 17 '.

In the embodiment which has just been described, the female part 11 is fixed by any conventional means on the back 26 of the bag 14. However if the back of the bag 26 is itself made of a flexible textile material, it can also occur a certain deformation of the flexible material at the level of the female part 11 during of the angular pivoting of the suspenders assembly that is why it is proposed a second variant embodiment according to which the female part 11 is integrated in the stiffening frame of the bag, for example in the case of a part 28 of great length extending vertically over the height of the bag and integral with everything medium adapted with the back of the bag.

Preferably in this second embodiment, the vertical part 28 forming this frame comprises, at least in its upper part, a plurality of superimposed elements similar to female parts. In the example shown in FIG. 8 shows a superposition of four female parts 11, each having strictly the same structure as that which has been described above. The advantage of this plurality of female parts is to be able to adjust the height of the set of straps relative to the back of the bag and more precisely the spacing between the attachment of the belt assembly and that of the strap assembly in function the size of the user.

The male part 10 is fixed by any conventional means to the strap assembly. It may for example be constituted by the assembly of several parts between which can be locked part 7a adapted accordingly of the central zone 7 of said set straps.

The present invention is not limited to the embodiments which have been described above as non-exhaustive examples. In particular it will have been noted that the attachment system of the invention can be applied not only to all of the straps but also of the waistband of the backpack. In the case where the backpack is equipped with a shoulder strap set consisting of one element monobloc of scapular supports and two carrying straps, as in the document WO.00 / 19863, the male part 10 (FIG. 3) can constitute in all or part of the central zone 7 (FIG. 1) of the one-piece element 5 between the zones lateral which are generally elevated from the central area, being padded with padding for support on the shoulders.

Furthermore, the first and second parts are not necessarily a male part with fixing head and a female part with central recess as described above. The means of cooperation between the two parts to achieve the pivoting hooking can differ, provided they allow the pivoting of the two parts along a pivot axis perpendicular to the back of the bag. The shape of the elastomer element is not necessarily annular. Through example the first and the second part can be glued on both sides opposite of a square elastomer plate.

In the example just described, the deformation of the elastomer element, during the angular pivoting of the first part relative to the second part is obtained by pressure, causing progressive compression of the elastomer. This mode of deformation is not exclusive of the invention. It has already been mentioned the shear deformation when the first and the second parts are fixed by gluing on the two faces of the elastomer element. It can also be a deformation by traction, by torsion or by bending of the elastomer element. For example, in the case of a deformation by traction, the elastomeric element can be in the form of two longiform tensioners 46 (FIG. 10) which are arranged parallel to the median axis DD 'of the bag and at equal distance from the latter and whose two free ends 46 a , 46 b are fixed respectively to the first part secured to the strap assembly (and / or belt) for the first end 46 a and to the second piece, secured to the back of the bag , for the second end 46 b . In the example illustrated in Figure 10, the two tensioners 46 are terminated by annular ends in which are fitted pins 47, 48 carried respectively by the first and second parts. The pins 48 carried by the second part are aligned with the pivot axis G. Thus the general direction of the two tensioners 46 is substantially tangential with respect to a circle centered on the pivot axis G and passing through the two pins 48. The angular pivoting of the strap assembly relative to the back of the bag, caused by the relative movements of the user's body, will cause the angular displacement of the studs 48 along this circle C. For one of the tensioners, this displacement will cause a deformation by traction, deformation which will oppose this pivoting and fulfill the role of damper sought. For the other tensioner, this pivoting will cause deformation by bending, also opposing, probably in a lesser proportion to said angular pivoting.

Claims (15)

Backpack of the invention comprising a bag itself, a strap assembly for attaching the bag to the user's shoulders, a belt assembly for attaching the bag around the waist of the user and a system for attaching the suspenders (and / or belt) assembly to the back of the bag, said attachment system comprising a first part secured to the suspenders (and / or belt) assembly and a second piece secured to the back of the bag , said parts cooperating with each other to allow the pivoting attachment of the first and second parts, along a pivot axis perpendicular to the back of the bag, characterized in that the attachment system comprises a) at least one elastomer element (16,46), integral with one of the two parts, b) and a support means integral with the other part and engaging at least when pivoting on the elastomer element (16,46), so that, during pivoting, the support means causes deformation of the elastomer element which opposes said pivoting. Bag according to claim 1 characterized in that the choice of the elastomer is determined so that the angular pivoting is between -5 and + 5 ° relative to a normal position. Bag according to claim 2 characterized in that the element 16 is made of vulcanized elastomer or of thermoplastic elastomer of Shore A hardness. Bag according to one of claims 1 to 3 characterized in that the elastomer element (16) is fixed by two anchoring points (17,17 ') on the rear face (10 a ) of the first part (10 ) and has at least one hollow area (19) between the two anchoring points (17,17 '), and in that the front face (11 a ) of the second part (11) has a lug (20) projecting, said lug (20) fittingly entering the hollow area (19) of the element (16), when the two parts (10,11) are hooked. Bag according to claim 4, characterized in that the elastomer element (16) has a transverse groove (19) and the lug is in the form of a long shoulder (20), the groove and the shoulder being arranged radially with respect to the pivot axis (G). Bag according to one of claims 1 to 5 characterized in that the element (16) is in the form of a partially or totally annular strip, centered on the pivot axis (G), and in that the attachment system comprises two sets, diametrically opposite, each consisting of at least one recessed area, possibly radial rib (19), and a lug per recessed area, possibly elongated shoulder (20). Bag according to claim 6 characterized in that the two assemblies in question are arranged symmetrically with respect to the vertical axis (DD ') of the bag. Bag according to one of claims 1 to 7 characterized in that the first part (10) has a window (31) allowing a part (30) of the elastomer element (29) to be seen from the front face (10 b ) of said first part. Bag according to one of claims 1 to 7 characterized in that the first part, integral with the strap assembly (and / or belt), is a male part (10) having a fixing head (13,40) which is projecting from the rear face (10 a ) of said part (10), and the second part (11), integral with the back of the bag, is a female part having a central recess (15) opening onto its front face ( 11 a ), said male (10) and female (11) parts cooperating with each other to allow the pivoting attachment of the male part (10) on the female part (11), along a pivot axis (G) corresponding to the axis of the fixing head (13,40). Bag according to claim 9, characterized in that the fixing head (13) is mounted to rotate freely in a housing (21) open on both sides of the male part, in that said head is terminated on one side by a manipulation tab (13 b ) accessible to the user by the opening giving into the housing (21) and on the other side by the T-shaped hooking part (13 a ), and in that the central recess (15) of the female part (11) is bordered by two locking lips (25) of the two branches (13 c ) of the T after penetration of the attachment part (13 a ) of the fixing head (13 ) in the recess (15) and rotation of the handling tab (13 b ) by a determined angle, preferably 90 °. Bag according to claim 10 characterized in that the fixing head (40) and its housing comprise a system of stops and positioning pawls making it possible, on the one hand, to limit the rotation of the manipulation tab as a function of the determined angle , preferably 90, and on the other hand to ensure a certain blocking of the fixing head when it reaches the two positions separated by said angle, namely the first in the position of introduction of the front part of the head fixing in the recess and the second in the locked position, after rotation. Bag according to claim 1 characterized in that the first and second parts comprise two circular portions (10 c , 11 c ), both centered on the pivot axis (G), one (10 c ) being in relief and the other (11 c ) recessed, able to fit one into the other. Bag according to claim 1 characterized in that the elastomer element consists of two tensioners (46), fixed by one end (46 a ) to the first part (47) and by the other end (46 b ) to the second part (48), said fixing constituting the support means engaged with the corresponding tensioner (46), so that, during pivoting, the deformation of one tensioner is obtained by traction and of the other tensioner by bending . Bag according to claim 1 characterized in that the second part (11) is integrated in the stiffening frame of the backpack. Bag according to claim 14 characterized in that the stiffening reinforcement (28) comprises a plurality of superimposed elements, having the structure of the second pieces, for adjusting the height of the positioning of the strap assembly (and / or belt) compared to the back of the bag.

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