EP0674861A1 - Backpack with a back pad - Google Patents

Abstract

The back pack (1), with a back padding (6), uses a knitted padding material (6) of plastics yarns bonded together at their intersections by bonding yarns or filaments. The padding can also be fitted with a layer of foam or foam rubber. <IMAGE>

Description

The invention relates to a backpack with a back cushion according to the preamble of claim 1.

Backpacks are bags with carrying straps, which are mainly used for hiking and are used to hold small items such as handkerchiefs and purses as well as food supplies. Larger backpacks are designed in such a way that they can also hold utensils for staying outdoors. Such backpacks are then used to record times and sleeping bags as well as items of clothing to change. Hence these backpacks designed very large and often heavy, so that they put an uncomfortable strain on the wearer's back. Since the wearer also exerts himself physically, he will sweat very quickly even in favorable climatic conditions. A particularly critical point is the back of the carrier on which the backpack rests. Most backpacks have a foamed back pad, which is equipped with channels for better ventilation, but due to the still very large contact surface, the surface remaining for evaporation is reduced to a minimum. As a result, the body sweat is sucked up by the cushion of the backpack, which leads to uncomfortable hypothermia, especially after breaks when lifting the load. Furthermore, body sweat, which is removed from the body as quickly as possible using modern climate-controlled underwear, cannot evaporate.

From DE-GM 85 16 418 U1 is a backpack with a back pad in the form of a coarse mesh elastic grid made of plastic, leather or the like. known that is attached to the outside of the pack sack essentially covering the support area on the back of the backpack carrier. This grid maintains a space between the back of the backpack carrier and the pack sack, which allows ventilation between the pack sack and the back of the backpack carrier. However, this ventilation is not effective because the space between the grille and the actual back wall of the backpack Sides is closed. Further problems consist in the fact that this relatively coarse-meshed lattice itself is built up in a complicated manner from lattice bars and interwoven plastic fabric tapes and is therefore not easy and inexpensive to produce, and that the lattice is firmly attached to the backpack, the attachment with cloth strips being relatively complex.

The object of the present invention is to provide a backpack with a back pad, the back pad being inexpensive to produce, allowing very good ventilation of the space between the backpack and the back of the backpack wearer and, in addition, being particularly easy to attach to the back of the backpack.

This object is achieved by a backpack with a back cushion of the type mentioned, which is characterized by the features specified in the characterizing part of patent claim 1.

The back cushion of the present backpack advantageously has the shape of a three-dimensional structure which consists of a multiplicity of plastic threads which intersect in places and which are connected to one another at the crossing points or at crossing points, preferably welded. The back cushion thus created creates a wide air channel between the back wall of the backpack and formed on the back of the rucksack carrier, through which a very good air circulation is ensured and the body's sweat is largely dissipated. Advantageously, the back cushion thus obtained cannot absorb or store moisture due to the relatively large loop widths and the nature of the plastic threads. It is therefore a permanently ventilated zone in which sweat can evaporate immediately.

The back cushion is advantageously designed as a hump-shaped mat. This is a knitted fabric, the plastic threads of which form bump-like elevations on one side of the mat and on the other side a smooth surface with a large mesh size, the cross-connections being formed by one or more of the threads.

The cusps of the back cushion are particularly advantageously formed in that the hot plastic threads removed from a nozzle arrangement are applied or flowed onto a roller with cusp-shaped elevations, the roller being moved back and forth in the axial direction. The flow rate of the threads is greater than the take-off speed of the roller, so that the thread loops accumulate on the roller surface. The smooth side of the mat produced in this way is preferably produced by a counter-pressure roller or a tape, in particular a Teflon tape.

A particular advantage arises when the relatively smooth one side faces the back of the backpack wearer and is relatively smooth and air-permeable to it, whereas the humps formed then only lie selectively on the back of the backpack. Since the smooth side faces the back of the backpack carrier, damage to the clothing of the backpack carrier or unpleasant pressure or scratches on the back of the backpack carrier are avoided. The smooth or flat side leads to a pleasant body touch.

In a simple manner, the knitted fabric of the back cushion consists of a multiplicity of threads which intersect in places and which are connected to one another, in particular welded, at the intersection points or a part thereof. The threads of the knitted fabric are advantageously made from a thermoplastic, that is to say from a plastic which is not self-flowing at room temperature and can be deformed repeatedly at elevated temperature, such as, for example, polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyamides (PA) etc., i.e. from plastics that are built up from uncrosslinked macromolecules.

In a further simple embodiment, however, the knitted fabric can also be made from cross-linked plastics, that is to say from thermosets, such as, for example, acrylic glass, polytetrafluoroethylene (PTFE) and the like.

The mat-shaped back cushion is particularly preferably detachably attached to the backpack. It can therefore be detached from the backpack during a break and used as a seat cushion. This is particularly advantageous in damp or cold places, since there is no capillary action which absorbs the moisture and passes it on to the seated wearer.

Since the shoulder straps are usually infinitely adjustable via a correspondingly shaped buckle and are therefore detachably attached to the lower ends of the rucksack or to short straps, the shoulder straps can be separated. Therefore, the hat can easily have an elongated opening in its upper edge region through which shoulder straps of the backpack are passed. Furthermore, for better attachment, the hat can also be provided in its lower region with openings for the passage of lower belts. Mats made in this way are suitable for retrofitting backpacks.

Conversely, straps on the mat can also be provided for fastening backpacks to which the shoulder straps are attached inseparably.

If the edges of the hat were flat and thus hardly resilient and quasi rigid, they can be clamped onto the backpack in suitable devices in an advantageous manner.

Grooved strips or plastics with a U-profile on the frame of the backpack are suitable as devices for clamping. These edges can also be overlapped in an advantageous manner by a collar device, so that the hat is held onto the backpack. These edges can also be clamped between the frame and waist belt.

Likewise, a flat edge area can be provided with a fabric which is provided on the side facing the backpack with an adhesive layer which hooks with a corresponding counterpart in the manner of a burdock.

In a simple manner, the edges of the mat can have openings through which a cord is drawn, the cord being releasably attachable to the backpack. These openings can also serve as buttonholes.

Advantageously, a rolling device can press down the edges of the mat and these edges can be melted so that the edges are formed flat.

The edges are advantageously melted and deformed by means of a simple hot air blower.

It is particularly advantageous if the side edges of the mat-shaped back cushion are bent over from the smooth side towards the other side after a heating operation and corresponding softening such that rounded side edges result in damage to the covers or linings accommodating the back cushion or to items of clothing lying against the back cushion. If, depending on the degree of the bend, the bent-over edge areas rest on or are spaced from the back cushion, there is the advantage that the back cushion has a greater thickness in the region of the bent-over side edges, so that a relatively large air exchange to the outside is possible there and cover by the backpack or the clothing of the backpack carrier is avoided. In order to achieve the greatest possible thickness, it is conceivable to bend the edge regions by 180 °, so that a double thickness is achieved or even curl, so that an even greater thickness can be achieved. If the side edges are made thicker and thus a good and free air exchange to the outside is ensured, the thickness of the cushion layer can be chosen to be relatively small. In order to reduce or avoid noise when the bent edge regions slide on the back cushion, a damping layer, in particular a foam or cellular rubber layer, is preferably arranged between the edge region and the back cushion and / or in front of the bumps of the cushion layer.

The back cushion is particularly preferably arranged in a sleeve which is made of an air-permeable material, one side of this sleeve with the aid of Velcro fasteners on the back of the backpack is releasably attachable.

It has been found that a laser beam can excellently cut the mat so that no sharp tips remain at the ends of the threads.

Protection is also sought for the knitted fabric as a cushion for backpacks per se. This knitted fabric can advantageously be provided as a retrofit part for backpacks. But also for back baskets with a rigid container such as a basket or a tub on a frame, e.g. Such a knitted fabric can be used for scabies that are used in the harvest.

Fig. 1

einen Rucksack mit einer Polstermatte,

Fig. 2

die Polstermatte,

Fig. 3

eine Halterung für die Polstermatte,

Fig. 4

eine weitere Polstermatte in Draufsicht,

Fig. 5

die Polstermatte in Seitenansicht,

Fig. 6

die Polstermatte in geschnittener Seitenansicht,

Fig. 7

eine Vorrichtung für ein Verfahren zur Herstellung einer Hatte mit flachen Rändern in Seitenansicht,

Fig. 8

die Vorrichtung in Draufsicht,

Fig. 9

eine Walze zur Herstellung der Hatte,

Fig. 10

eine zweite Walze mit einem Rand,

Fig. 11

in schematischer und perspektivischer Darstellung eine Ansicht des Rückenpolsters von der vorzugsweise der Rucksackrückenseite zu-gewandten Seite her;

Fig. 12

eine schematische perspektivische Darstellung des Rückenpolsters von der dem Rücken des Rucksackträgers vorzugsweise zugewandten Seite her;

Fig. 13

einen Schnitt durch die Polsterschicht der Fig. 11 und 12 und

Fig. 14 bis 19

Weiterbildungen der Erfindung.

The embodiments according to the invention are explained in more detail below in connection with the figures. Show it:

Fig. 1

a backpack with a pad,

Fig. 2

the upholstery mat,

Fig. 3

a holder for the cushion mat,

Fig. 4

another upholstery mat in top view,

Fig. 5

the upholstery mat in side view,

Fig. 6

the upholstered mat in a sectional side view,

Fig. 7

a device for a method for producing a hat with flat edges in side view,

Fig. 8

the device in plan view,

Fig. 9

a roller for making the hat,

Fig. 10

a second roller with a rim,

Fig. 11

in a schematic and perspective representation, a view of the back cushion from the side preferably facing the back of the backpack;

Fig. 12

a schematic perspective view of the back cushion from the back of the backpack wearer preferably facing side;

Fig. 13

a section through the cushion layer of FIGS. 11 and 12 and

14 to 19

Developments of the invention.

1 shows a backpack 1 with two shoulder straps 2 and 3, a waist belt 4, a holder 5, a cushion mat 6 and a body 7, hereinafter also called a container or bag, with an upper part 8. The holder 5 holds the shoulder straps 2 and 3 and is part of a frame to which the bag 7 is attached with its upper part 8. The bracket 5 overlaps with a collar 9 an upper V-shaped flat edge 10 of the cushion mat 6. The cushion mat 6 has a second lower flat edge 11 at its lower end 12, which is between the waist belt 4 and the bag 7 or the frame is releasably clamped.

FIG. 2 shows the cushion mat 6, which consists of threads which intersect in places and which are connected or welded to one another at the crossing points or at crossing points. The threads used for mat production are melt-spun from a large number of possible thermoplastic polymers or made from thermosets in another suitable manner. The production of such mats is described for example in DE-PS 25 30 499. The hat 6 is a three-dimensional knitted fabric made of 1-40 mm high, 0.5-30 mm wide, in particular 2-30 mm high, 1-20 mm wide, preferably 5-20 mm high, 3-10 mm wide loops of a thermoplastic Plastic. The weight of this had 6 is 200-900 g / m², in particular 400-675 g / m², preferably 500 g / m². The hat 6 has an upper v-shaped recess 13 through which a lateral displacement of the hat 6 can be prevented. A V-shaped upper flat edge 10 of the hat 6 delimits the recess 13.

Fig. 3 shows the holder 5 with the collar 9. The holder 5 has essentially the size of the recess 13 and is shaped so that the collar 9 engages over the flat edge 10 of the mat 6.

FIG. 4 shows a further mat 20 in plan view and a section line 26. In this figure, several fastening options are shown. The mat has three openings 21, 22 and 23 through which shoulder straps can be guided. Furthermore, this mat 20 has flat edges 24 and 25, onto which a fabric is sewn, which hooks like a Velcro to a corresponding counterpart, which is placed on the bag 7 or the frame. Openings 30 are used for threading a cord or for buttoning.

Fig. 5 shows the hat in side view with the flat edges 24 and 25 on which the fabric 27 is sewn. It has been found that the fabric 27 cannot be sewn on the plastic threads of the edges 24 and 25, since the mat is very wide-meshed and has relatively large stitches between the plastic threads, so that the fabric 27 can slip on the edges 24 and 25. For the fabric 27, a corresponding counterpart made of fabric is created on the opposite side of the edges 24 and 25, so that when the two fabrics 27 and 28 are sewn, the fabric 27 no longer slips on the edges 24 and 25.

Fig. 6 shows the mat in a sectional view, the cut being made along the line 26. The bump-like elevations 29 of the mat become visible.

7 and 8 show a method for producing the mat 20, also referred to below as knitted fabric, with a table 40, a rolling device 41, three lasers 42, 43 and 44, two deflectors 45 and 46 and two hot air blowers 47. The knitted fabric 20 is driven by the polygonal rolling device 41 and slides in the direction 48 over the table 40. Two lasers 42 and 43 are arranged in front of the rolling device, which separate irregular edge strips 24a and 25a and straighten the mat 20. Two deflectors 45 and 46 lead the edge strips 24a and 25a for recycling. The edges 24 and 25 remaining in the knitted fabric are pressed down by plates 49 of the rolling device 41 and coated with a hot air stream from the hot air blowers 47. The mat thus melts in its edge areas and retains the flattened shape specified by the rolling device at these points. A laser 44 at the end of the rolling device 41 cuts the knitted fabric 20 into the correct size perpendicular to the running direction 48. Between the rolling device 41 and the laser 43, the substances 27 and 28 with the adhesive covers are advantageously supplied, applied to the edges 24 and 25 and sewn. The lasers 42 can also and 43, and the deflectors 45 and 46 in the running direction of the knitted fabric behind the rolling device and straighten after rolling. If the edge strips 27 and 28 are advantageously made in one piece, so that the edge of the knitted fabric is covered by the fabric, the lasers 42 and 46, and the deflectors 45 and 46 can be saved.

FIG. 9 shows a roller 50 for simple manufacture of an upholstery mat 51. For this purpose, the roller 50 has bump-like elevations 54. Melted threads 57 drip from nozzles 58 of a nozzle plate 58a onto the roller 50 and form the cushion mat or the knitted fabric 51 with the flat edges 52 and 53. Since the flow rate of the threads 57 is greater than the withdrawal speed of the roller 50, a backlog occurs. so that the threads 57 lie in a loop on the surface of the roller 50. The roller is deflected in the axial direction by an eccentric, so that the threads 57 overlap and cross-link with one another. Two deflectors 59 and 60 delimit the edge of the mat 51. If the mat is to be produced with flat edges, the roller 50 preferably has two flat edge strips 55, 56.

10 shows a second roller 61 which has two beads 62 which replace the deflectors 59 and 60.

In the manner shown in FIG. 11, there is the cushion layer, which is preferably produced by the above method or the back cushion 1 'of the present rucksack from threads which cross over in places and are connected to one another, in particular welded, at at least part of the crossing points, preferably at essentially all crossing points. As can be seen, the back cushion 1 'has a relatively smooth side 2', in which the threads run in one plane. Grid-shaped connection points 3 'are provided in the plane, from which threads for forming cusps 4' run to the other side of the back cushion 1 '. There is preferably a bump 4 'above the preferably approximately square area enclosed by four adjacent connection points 3'. The tips of the bumps 4 'end approximately in a plane parallel to the plane of the side 2'.

Since the back cushion 1 'has relatively sharp outer edges after cutting, the edges of the back cushion 1' are preferably heated in the manner shown in FIG. 14 with a hot air blower (not shown) and away from the smooth side 2 'by a predetermined angle , which is preferably in a range of 90 ° to 180 °, bent. The resulting back cushion 1 'has rounded edges without sharp corners or the like. The degree of the bending depends on the respective requirements for the back cushion 1 '. FIG. 14 shows a bend through 180 °, with which a double thickness of the side edges can be achieved. According to FIG. 15, it is also conceivable to achieve an even greater thickness of the side edges will roll the edge areas beyond 180 °. Depending on requirements, it is also conceivable to reinforce only a certain part of the side edges more or less in the manner described. The greater the thickness of a side edge, the greater its rigidity.

In order to avoid noise development, which can result from the bent edge areas rubbing on the cushion layer 1 ', a noise-damping material, preferably a foam or foam rubber layer 9', is preferably placed between the edge area and the back cushion 1 '(FIG. 14 ) arranged. In addition, a further noise-damping and / or shock-absorbing layer 9 ″, which can preferably also consist of foam or foam rubber, can be arranged on the backpack side in front of the bumps 4 ′, as shown by way of example in FIG. 16. A mesh layer which consists of a plastic material or a natural material can also be provided as the damping layer 9 'and / or 9' '.

In the manner shown in FIG. 16, the back cushion 1 'produced in the manner described is preferably inserted into a casing 10' made of an air-permeable material, advantageously a coarse-mesh fabric and / or a net, so that one side 6 ' the cover 10 'abuts the smooth side 2' of the back cushion 1 'and the other side 5' of the cover 10 'extends over the tips of the bumps 4'. By arranging the Back cushion 1 'in such a sheath 10' is achieved that the back cushion 1 'is given a pleasing appearance and, in addition, undesirable friction through direct contact of the back cushion 1' is avoided.

For fastening the cover 10 'containing the back cushion 1' to the back wall 11 'of the backpack (FIG. 18), preferably the one wall 5' of the cover 10 'against which the humps 4' rest has Velcro fastener parts 7 'on the outside can be locked to corresponding Velcro fasteners 12 'which are attached to the back wall 11' of the backpack. Preferably, two Velcro strips 12 'spaced apart in the transverse direction run vertically on the back wall 11' of the backpack.

In order to prevent the back wall 11 'from bulging, which would adversely affect the action of the Velcro fastener parts 7', 12 ', e.g. to avoid when packing the backpack, the backpack back wall 11 can be kept in a relatively flat state by stiffening elements, not shown.

While the side 6 'and the cover parts covering the side edges of the back cushion 1' are made of an air-permeable material, the side 5 'of the cover 10' can also be air-impermeable.

17 shows an embodiment in which a preferably upwardly open and preferably closable pocket is formed on the back wall of the backpack 11 'by sewing or by another attachment of a power supply 13', into which the cushion layer 1 'can optionally be inserted .

In the place of the Velcro fastener parts 7 'described, other fastening devices can also be used.

According to FIG. 15, a pipe 22, in particular made of plastic, can be introduced into the center of the rolled-up edge area, which is preferably perforated for the purpose of ventilation. In particular, the vertically extending tubes 22 can advantageously serve to receive telescopic walking sticks, which can simply be inserted into them from above and thus transported. In this case, the edge region is preferably bent through an angle of approximately 270 °.

According to FIG. 1, the hip belts 23 can also be formed by the described cushion layer 1 in the area of their rear and lateral bearing surfaces. This cushion layer is preferably covered by a network structure.

In connection with FIG. 19, it is pointed out that the back cushion 1 ″ also has two opposite ones can have smooth or flat surfaces 2 'and 2''which are spaced apart from one another, loop surfaces running in the surfaces 2', 2 '' and between the same plastic threads. The plastic threads are firmly connected to one another at the respective crossing points. In particular, this connection takes place in that the viscous and heated plastic threads emerging from the nozzle arrangements lie against one another and cross-link during the loop-like laying on a base at the crossover points. The firm connections at the crossing points ensure that a compression of the back cushion 1 ″ is opposed because, because of the many connecting points of the plastic threads, a relatively stable structure is created in the space enclosed by the back cushion 1 ′. In particular, the connections in the flat surfaces ensure that the back cushion 1 'is also very stable with regard to tensile and compressive forces in or parallel to its flat surfaces 2', 2 '' and therefore maintains its shape. The advantages described above also apply if the back cushion 1 'described in connection with FIGS. 11 to 13 is formed with plastic bumps (4') which are firmly connected to one another at the crossing points.

Claims (35)

Backpack (1) with a back cushion (6, 20), characterized in that the back cushion (6, 20) is designed as a knitted fabric (6, 20) which consists of a large number of plastic threads which cross over at points and are connected to one another at crossing points. Backpack according to claim 1, characterized in that the knitted fabric (6, 20) is designed as a hump-shaped mat (6, 20). Backpack according to claim 1 or 2, characterized in that the knitted fabric (6, 20) consists of a multiplicity of threads melt-spun from synthetic polymers, crossing in places and welded to one another at crossing points. Backpack according to claim 3, characterized in that thermoplastics are used as synthetic polymers. Backpack according to claim 3, characterized in that thermosets are used as synthetic polymers. Backpack according to one or more of the preceding claims, characterized in that the mat (6, 20) can be detachably attached to the backpack. Backpack according to one or more of the preceding claims, characterized in that the mat (6, 20) has openings (21, 22 and 23) for carrying backpack straps (2, 3 and 4). Backpack according to one or more of the preceding claims, characterized in that the mat (6, 20) has straps for fastening. Backpack according to one or more of the preceding claims, characterized in that the mat (6, 20) has edges (24, 25) which are flat. Backpack according to one or more of the preceding claims, characterized in that fabrics (27) which have an adhesive layer are arranged on the flat edges (24, 25). Backpack according to one or more of the preceding claims, characterized in that the edges (24, 25) have openings (30). Backpack according to one of claims 1 to 11, characterized in that the back cushion (1 ') has a flat side (2'), in the surface of which grid-shaped connection points (3 ') are arranged, in which the plastic threads of the surface and forming of humps (4 ') from the Plastic threads extending to the other side of the back cushion (1 ') are connected to one another. Backpack according to claim 12, characterized in that a hump (4 ') is formed over each four adjacent connection points (3') which enclose a partial area of the surface. Backpack according to one of claims 1 to 11, characterized in that the back cushion (1 ') has two spaced flat sides (2', 2 ''), that the plastic threads in the surfaces of the flat sides (2 ', 2'' ) and run in a loop shape in the space between the flat sides (2 ', 2'') and are connected to one another at intersections. Backpack according to one of claims 1 to 14, characterized in that the plastic threads are firmly connected to one another at essentially all crossing points. Backpack according to one of claims 1 to 16, characterized in that the plastic threads are cross-linked at crossover points. Backpack according to one of claims 1 to 16, characterized in that the back cushion (1 ') is arranged in a cover (10') which consists of a material which is permeable to air at least on three sides. Backpack according to claim 17, characterized in that on the rear wall (5 ') of the cover (10') fastening devices (7 ') for fastening the cover (1') containing the cover (10 ') on the back side (11') of the Backpack are provided. Backpack according to claim 18, characterized in that the fastening means are Velcro elements (7 '). Backpack according to claim 18 or 19, characterized in that the back side (11) is stiffened. Backpack according to one of claims 12 to 17, characterized in that edge regions of the back cushion (1 ') are bent out of the plane of one side and bent over by a predetermined angle. Backpack according to claim 21, characterized in that the predetermined angle is in a range from 90 ° to 180 ° or in that the edge regions are rolled in beyond 180 °. Backpack according to claim 21 or 22, characterized in that a noise-damping layer (9 ') is arranged between the bent edge regions and the back cushion (1'). Backpack according to one of claims 1 to 23, characterized in that in front of the humps (4 ') of the back cushion (1') or in front of a flat side (2 '') of the back cushion (1 ') a noise and / or shock-absorbing further Layer (9 '') is arranged. Backpack according to claim 23 or 24, characterized in that the layer (9 ') and / or the further layer (9'') consists of foam or foam rubber or is formed by a network. Backpack according to one of claims 22 to 25, characterized in that the rolled-up edge areas comprise a tube (22). Backpack according to claim 26, characterized in that the tube (22) is a perforated plastic tube into which hiking sticks or the like can be inserted for carrying on the backpack. Backpack according to one of claims 1 to 16 or 20 to 27 in conjunction with one of claims 1 to 16, characterized in that a power supply unit (13 ') is attached to the rear side (11) of the backpack to form a bag into which the Back cushion (1 ') can be used. Backpack according to one of claims 1 to 28, characterized in that the hip belts (23) have a back cushion (1 ') in the region of their rear and / or lateral contact surfaces. Backpack according to claim 29, characterized in that the back cushion (1 ') is covered by a net structure on the side facing the backpack carrier. Method for producing a hat (20) provided with flat edges (24, 25), characterized in that the edges (24, 25) of the hat (20) can be pressed down by a rolling device (41) and the threads of the mat edges (24, 25 ) are deformable in such a way that the edges (24, 25) of the mat (20) retain their flattened shape after leaving the rolling device (41). A method according to claim 31, characterized in that the threads are melted at the edge by a hot air blower (47). Method according to claim 31 or 32, characterized in that the mats (6, 20) are cut by means of a laser (42, 43, 44). Method for producing a back cushion (1 ') for a backpack according to one of claims 21 to 30, characterized in that at least one edge region of the Back cushion (1 ') heated and bent out of the plane of one side and bent over a predetermined angle. Use of the back cushion (1 ') of a backpack according to one of claims 1 to 30 as a seat pad.

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