Back length adjustment device for a backpack, backpack back panel and backpack

Abstract

The invention relates to a back length adjustment device for a backpack, comprising a sliding body, a guide device and a fixing element, wherein the sliding body has a shoulder strap region, a guide region and a fixing region, wherein the shoulder strap region of the sliding body has a fastening region for connection to a shoulder strap of the backpack, wherein the guide device has a guide mechanism which cooperates with the guide region and can be fixedly connected to a back panel of the backpack, wherein a guide receptacle formed on the sliding body cooperates with the guide mechanism of the guide device such that the sliding body can be moved along the guide mechanism, wherein the fixing element can be fixedly connected to the back panel of the backpack by means of a connecting device, wherein the fixing region of the sliding body extends in the longitudinal direction of the back panel of the backpack.

Description

Technical Field

[0001] The present invention relates to a back length adjustment device for a backpack, a backpack back panel having the back length adjustment device according to the present invention, and a backpack having the back length adjustment device according to the present invention. Background Technology

[0002] In a typical backpack's carrying system, two shoulder straps are securely sewn to the backpack at the upper edge or upper area of ​​the back. The lower ends of these straps are attached to two corner points on the lower edge of the back. Adjustment mechanisms, such as clips, are usually present at these points to allow adjustment of the shoulder strap length to fit the user's body type. However, users may have different back lengths depending on their height, so backpacks with fixed back lengths may not be suitable for everyone. For example, a typical (and smaller) children's backpack is usually not suitable for users taller than 190 cm, but a shorter adult might (and possibly) be able to use it.

[0003] For simpler backpacks, this problem can be solved by choosing the right backpack, either large enough or small enough.

[0004] For more complex and larger backpacks (which are usually only available in one size), this problem can be solved by a built-in "back length adjustment system." This system can change the distance between the upper and lower anchor points to suit the user's individual needs. For this purpose, the upper shoulder strap anchor points are usually equipped with adjustment mechanisms to change the height of the upper load-bearing anchor points along the longitudinal axis of the backpack's back panel. However, in order to stably and reliably bear the load, the essentially variable upper load-bearing anchor points must be forcefully connected to the backpack's back panel at the desired position on the central longitudinal axis.

[0005] A common solution is to connect two upper support points with a horizontally extending securing bridge (usually made of plastic or rigid strapping). There is a gap of a few centimeters between the two support points on the bridge. On the backpack's back panel, multiple horizontally arranged straps are sewn in a trapezoidal pattern across the central longitudinal axis, but these straps are not sewn together in the central area, i.e., the longitudinal axis area, instead forming individual loops. The position of each horizontal strap defines the possible upper support points for the shoulder straps. The horizontally extending securing bridge is then placed parallel to a strap that is also horizontally extended at the desired height. Next, another vertically extending, unsecured strap is passed through the open loop of the horizontally installed strap, and it also includes a similarly parallel bridge with support points. This variable strap (comprising both the horizontally arranged strap firmly sewn to the backpack back panel and the parallel bridge with support points) is then forcefully closed. This is typically achieved using sufficiently strong Velcro. The disadvantage of this approach is that changing the setup is both time-consuming and laborious. To create a force-fitting connection, Velcro straps are typically designed to be very strong. Furthermore, they must fit snugly enough to ensure the force-fitting of the bridge components, thus preventing the backpack body from rotating around the backpack's imaginary longitudinal axis.

[0006] EP4349212A1 discloses a back length adjustment device for a backpack, comprising a housing that can be snapped onto a locking plate fixedly mounted to the back panel of the backpack. The housing contains a slider that can move vertically relative to the housing. Upper fastening points of the shoulder straps are formed on the slider via a support plate securely connected to the slider. The vertical movement of the slider relative to the housing is locked and released by a rack within the housing that can rotate about a vertical line. For this purpose, the rack has teeth that engage with corresponding notches on the slider (preventing vertical movement of the slider) or not engage with the notches (allowing vertical movement of the slider) depending on the angle and shape of the rack.

[0007] According to utility model DE202014010653U1, for example, a back length adjustment device is also disclosed, in which a locking pawl securely mounted on the backpack back panel works in conjunction with a vertically extending strip-shaped engaging section. The engaging section is connected at its upper end to a shoulder strap fastening device, on which two shoulder straps are provided. Here, the engaging section has a toothed profile, and the locking pawl can be moved from a locked state to a released state. Therefore, the backpack user can adjust the upper load-bearing fixing point in its vertical position to meet their needs by placing the locking ratchet in its released state, moving the shoulder strap fastening device vertically relative to the locking pawl to the desired position, and then placing the locking pawl back in its locked state. Summary of the Invention

[0008] The purpose of this invention is to provide a back length adjustment device for a backpack, a backpack back panel having such a back length adjustment device, and a backpack having such a back length adjustment device, so as to avoid the above-mentioned problems.

[0009] A back length adjustment device achieves this purpose, wherein the upper fixing point of the shoulder strap, formed in the shoulder strap area of ​​the sliding body, can be changed vertically by a guide device. A portion of this guide device has a guide receiving portion formed on the sliding body, and another portion has a guide device formed on the backpack back panel, which is a component of the backpack back panel support structure. Length fixing is achieved through a fixing area and is independent of the guide; the fixing area does not necessarily need to act as a guide but rather works in conjunction with a fixing mechanism that can be fixed to the backpack back panel. Here, the fixing mechanism can move between its adjustable position (adjustable back length) and its fixed position (horizontal position cannot be changed). By separating the guiding and fixing functions, the components of the back length adjustment device assigned to each function can better focus on a single function, thus achieving better results.

[0010] In a first alternative embodiment of the invention, the guiding mechanism is advantageously shaped as a straight line, and the fixed area of ​​the sliding body extends parallel to the guiding mechanism. This achieves an easily implemented combination of guiding and fixing functions.

[0011] An advantageous improvement of the first alternative embodiment of the invention lies in that the slider has a support plate and a fixing band, wherein the support plate includes a shoulder strap region and a guide region, the guide region preferably being formed in the edge region of the support plate, the fixing band includes a fixing region, and the support plate and the fixing band are detachably connected to each other, particularly by force-fit and / or form-fit. This allows for a clear division of the two functions: the guiding function is achieved by the support plate with the shoulder strap region and the guide region, while the fixing function is achieved by the fixing band acting in conjunction with the fixing element. By detachably dividing the elements performing their respective functions, these components can be better individually adjusted for their intended functions. Furthermore, when maintenance is required, typically only the element in one of the two functional areas needs to be replaced, thus simplifying and increasing the cost of maintenance.

[0012] Another advantageous improvement of the first alternative of the invention is that the fastening area has a shoulder strap groove through which the shoulder strap can be guided, preferably also through, the shoulder strap groove, and / or the guiding area has two parallel guiding grooves, particularly having a cross-section that is part of an arc and preferably covers more than 180° of the circle, particularly 200° to 270°. This makes shoulder strap installation very convenient. By using the grooves as guiding mechanisms, the support structure of the backpack back panel, which is typically in the form of wires, can be fully utilized, with the wires embedded in the grooves. If the grooves cover more than 180° of the arc, and when the material of the guiding area is a flexible material (e.g., plastic), the wires can be snapped into the grooves and run within them. This type of area is particularly advantageous. The cross-section of the wires can be circular, elliptical, or flat; they can also be formed as a strip-like frame. The wires or frames (both of which can be hollow profiles) can optionally be made of spring steel, aluminum, or plastic.

[0013] In a second alternative embodiment of the invention, the slider advantageously includes a connector and a shoulder strap portion. The connector has a connecting mechanism groove and / or at least one stitching groove. The connector and the shoulder strap portion are connected to each other by a connecting mechanism disposed in the connecting mechanism groove and / or by at least one stitch extending in at least one stitching groove. A guide ring is formed on the shoulder strap portion as a guide receiving portion, which works in conjunction with the guide mechanism of the guiding device. Since the guiding function is transferred from the support plate in the first alternative embodiment to the shoulder strap portion, reliable operation of the back length adjustment is ensured even when carrying a heavier backpack.

[0014] An advantageous improvement of the second alternative embodiment of the invention is that the guiding mechanism has two frame elements symmetrically formed with respect to the fixed area, and the frame elements are part of the backplate load-bearing structure. This is easy to implement and maintains reliable guiding function even under high loads.

[0015] Another advantageous improvement of the second alternative embodiment of the invention is that the guiding mechanism has a region parallel to the fixed region and a region extending obliquely along the fixed region. Thus, the guiding mechanism can be formed such that it not only performs its guiding function well but also provides optimal support for the backpack back panel.

[0016] Another advantageous improvement of the two alternative embodiments of the present invention is that the support plate and / or connectors and / or fixing straps are all integrally formed. This makes them very easy to manufacture, for example, using injection molding processes from plastic materials.

[0017] Another advantageous improvement of the two alternative embodiments of the present invention is that the support plate or connector is formed symmetrically with respect to the central axis, and the fixing area extends along the central axis. Due to this symmetry and the arrangement of the fixing mechanism along the axis of symmetry, torque around the vertical line can be largely prevented.

[0018] Another advantageous improvement of the two alternative embodiments of the present invention is that the shoulder strap is guided through the shoulder strap groove, and / or a first pull strap is provided at the end of the fixed area away from the shoulder strap area, and / or a second pull strap is provided at the end of the shoulder strap area away from the fixed area. This pull strap allows the user to adjust the back length with particular comfort.

[0019] Another advantageous improvement of the two alternative embodiments of the present invention is that the fixing mechanism has a fastener that is movable between an adjustable position and a fixed position, wherein the fastener is particularly capable of overcoming the spring force to move out of the fixed position. The fastener is a simple and effective device that ensures secure fixing and trouble-free adjustment. The spring force can be achieved through a design with a separate spring or a spring element integrated into the fastener. Both alternative embodiments are familiar to those skilled in the art. Incorporating a spring or spring element, a ratchet mechanism can be provided in a suitable fixing element design (e.g., as a rack with a suitable tooth pitch), wherein unidirectional adjustment (preferably upward adjustment) can be achieved without additional operation of the fastener. The alternative embodiment with an integrated spring element (i.e., the fastener is integrally formed) has the advantage of simpler manufacturing process and lower cost.

[0020] Another advantageous improvement of the two alternative embodiments of the invention is that the fixing area has locking recesses or locking ribs, particularly equidistant and rack-shaped, and the fixing element has locking protrusions that cooperate with the locking recesses or locking ribs in a force-fit and / or form-fit manner. This allows for particularly effective fixing using readily available parts. The equidistant adjustment is advantageous because the user always obtains the same distance between the two adjustment options and can easily self-adjust to these positions.

[0021] The aforementioned objectives are also achieved through a backpack back panel. By using wire or strap frames as part of the support structure, no additional components need to be added to the backpack back panel; instead, existing mechanisms can be used for guidance functions in a resource-efficient and reliable manner. Furthermore, the aforementioned advantages can also be achieved through the back panel.

[0022] An advantageous improvement of the present invention is that the cable section or strip frame is visible on the outside of the back panel, while the rest of the support structure is located inside the back panel or covered by a cover. This allows the back length adjustment device to be easily mounted to the backpack back panel without affecting the cover layer, and only the functionally movable areas are visible and exposed.

[0023] Furthermore, the aforementioned objective is also achieved through a backpack. It achieves the same advantages as the aforementioned back length adjustment device and back panel. Attached Figure Description

[0024] The present invention will now be described in more detail with reference to the embodiments shown in the accompanying drawings. The accompanying drawings show:

[0025] Figure 1 A schematic diagram of the backpack back panel according to the present invention is shown, employing a first embodiment of the back length adjustment device according to the present invention.

[0026] Figure 2a , Figure 2b It shows Figure 1 The mid-back length adjustment device (with slight modifications) is located at its lower and upper limits.

[0027] Figure 3 A frontal perspective view of a second embodiment of a back length adjustment device without a guide mechanism is shown.

[0028] Figure 4 It shows Figure 3 Rear view of the mid-back length adjustment device.

[0029] Figure 5 It shows Figure 3 Right side view of the mid-back length adjustment device.

[0030] Figure 6 It shows Figure 3 A bottom view of the mid-back length adjustment device.

[0031] Figure 7 It shows Figure 3 Front view of the bearing plate of the sliding body.

[0032] Figure 8 It shows Figure 3 Front view of the fixed mechanism.

[0033] Figure 9 It shows Figure 3 Front view of the fixed component in the middle.

[0034] Figure 10 A schematic diagram of the backpack back panel according to the present invention is shown, employing a third embodiment of the back length adjustment device according to the present invention.

[0035] Figure 11a , Figure 11b It shows Figure 10 The mid-back length adjustment device (with slight modifications) is located at its lower and upper limits.

[0036] Figure 12 A front view of the slider of the third embodiment is shown.

[0037] Figure 13a , Figure 13b It shows Figure 12 Enlarged front and rear views of the connecting component.

[0038] Figure 14a , Figure 14b The front and rear views of the alternative connector are shown, as well as

[0039] Figure 15a , Figure 15b It shows Figure 14a , Figure 14b A perspective view of the connector. Detailed Implementation

[0040] Figure 1 A backpack back panel 7 according to the invention is schematically shown, the backpack having a back length adjustment device according to the invention. The back panel 7 has a support structure 20 made of wire, which is circular in the illustrated embodiment, but may also have other cross-sectional shapes, such as elliptical or rectangular. Two waist belts 8 are installed in the lower region of the back panel 7, and two shoulder straps 5 are installed in the upper region at upper fixing points (the lower fixing points are not shown in the figure for clarity).

[0041] In addition, the back panel also has a back length adjustment device according to the present invention, which can change the horizontal distance between the upper and lower fixing points of the shoulder strap 5, so that the backpack (the back panel 7 shown in the figure is a part of it) can adapt to users with large differences in body size.

[0042] Therefore, the back length adjustment device has a slider 1 (see Figure 2a and Figure 2b (See below for further reference.) Figure 2a and Figure 2b They respectively demonstrate relative to the data based on Figure 1 The implementation has a slightly modified back length adjustment device at its lower and upper limits, and the details in these figures are also clearer. Figure 1 Implementation methods and Figure 2a and Figure 2b The difference in the embodiments is that, Figure 1 A first pull strap 21 is installed at the lower end of the fixed strap 4, and a second pull strap 21 is installed at the upper end of the sliding body 1, which makes the operation of the back length adjustment device more convenient.

[0043] The slider 1 and the fixing strap 4 are integrally formed. In the upper region, the slider is configured as a support plate 12, on which shoulder straps 5 are respectively installed in the two shoulder strap regions 2. The left and right outer regions of the slider 1 constitute guide regions 3 (in Figures 3 to 7In another embodiment of the slider 1 shown, the guide region 3 is essentially constructed as a guide groove 11, and it slides along the wire segment 10, interacting with the straight wire segment 10 of the support structure 20 of the back plate 7 on each side. Since the support structure 20 is fixed in position relative to the back plate 7 (the lower fixing point of the shoulder strap 5 is formed in the lower region of the back plate 7, not shown), the horizontal distance between the upper fixing point and the lower fixing point of the shoulder strap 5 changes when the slider on which the shoulder strap 5 is fixed moves.

[0044] To ensure that the selected length of the slider 1 is fixed at the desired position after corresponding movement, and to prevent undesirable changes in this position, a fixing device is provided. This fixing device has a movable portion, namely a fixing strap 4 extending downward from the support plate 12, and a fixing portion, namely a buckle 18 fixedly connected to the backpack back panel 7 by a known fastening device. The slider 1 can be fixed at predetermined discrete positions by the buckle 18. For this purpose, the slider has a series of horizontally extending locking ribs 16, which protrude from the plane of the fixing strap 4 and can engage with a locking element on the buckle 18 that can engage with it (not shown in the figure, but such combinations are well known in the prior art). The buckle 18 has two states: an adjustment state and a use state. In the adjustment state, the slider 1 can move freely horizontally along the wire section 10; in the use state, the slider 1 is fixed relative to the buckle 18. To ensure good mobility of the slider 1 in the adjusted state, the left and right wire segments 10 are oriented parallel to each other, and the guide receiving portions 11 in the two guide areas 3 on the left and right sides of the slider 1 are also oriented parallel to each other. Furthermore, the fixing band 4 extends parallel to the wire segments 10, i.e., the guide device 19, and is located in the middle of the two wire segments 10. The slider 1 is mirror-symmetrical about the vertical central axis between the two wire segments 10.

[0045] exist Figure 2a In the middle, the slider 1 of the back length adjustment device passes through the uppermost locking rib 16 at its lowest position (as shown in the image). Figure 2b (As shown) is fixed to buckle 18. This minimizes the horizontal distance between the upper and lower fixing points of the shoulder strap 5, making the backpack particularly suitable for shorter users. Figure 2b In the middle, the slider 1 of the back length adjustment device passes through the lowest locking rib 16 at its highest position (as shown in the image). Figure 2a (As shown) It is fixed to the buckle 18. This maximizes the horizontal distance between the upper and lower fixing points of the shoulder strap 5, making the backpack particularly suitable for taller users.

[0046] Figures 3 to 9 Another embodiment of the assembly consisting of slider 1 and fastener 18 is shown. Figures 7 to 9The various parts of this embodiment are shown respectively (and relative to) Figure 3 (Shown at magnified scale).

[0047] This embodiment is the same as the one described above. Figure 1 and Figure 2a and Figure 2b The illustrated embodiment (wherein) Figure 2a and Figure 2b and Figure 1 The main difference compared to the slightly modified version is that the slider 1 adopts a two-part design. The slider includes a support plate 12 and a fixing belt 4, which are designed as independent components, but as... Figures 3 to 6 As shown, they can still be assembled into a single unit that will not accidentally separate into two parts, only separating when needed (e.g., for maintenance). This two-part design encounters fewer problems in production (typically using injection molding) and has lower manufacturing costs.

[0048] Figure 7 A single support plate 12 is shown. Corresponding guide areas 3 are located on the left and right edges, each designed as a vertically extending guide groove 11. In cross-section, the guide groove 11 is formed along an arcuate trajectory spanning an angle exceeding 180° (see also...). Figure 6 (A bottom view of the component); in this example, the angle is approximately 260°. If the support plate 12 is made of elastic plastic, the slider 1 can snap onto the wire section 10, which serves as the guide mechanism 9. Once snapped in place, the support plate 12 will not accidentally detach from the wire section 10, thus achieving a well-functioning device that ensures the reliable operation of the shoulder strap 5 length adjustment mechanism.

[0049] Facing the center position, each side has a shoulder strap area 2, in which shoulder straps 5 are respectively installed through two parallel shoulder strap slots 6 that slope outwards and downwards (using a process well known in the prior art). This defines the upper fixing point of the shoulder straps 5.

[0050] On the vertical central axis of the support plate 12 (the support plate is constructed in a mirror-symmetric manner with respect to this axis), a pull strap groove 22 is provided in the upper region, and a pull strap 21 (see...) Figure 1 The strap groove 6 can be placed in the strap groove. Below the shoulder strap groove 6, the reinforcing ribs 14 extend from both sides and slope toward the center, thereby providing the necessary rigidity for the load-bearing plate 12.

[0051] A fastening bridge 23 is formed between the ends of the reinforcing ribs 14 facing the center, the fastening bridge extending from the plane of the bearing plate 12 (i.e., Figure 7 The drawing plane in the diagram protrudes upwards, and its height is higher than that of the reinforcing rib 14. The opening thus formed between the planes of the reinforcing rib 14, the fastening bridge member 23, and the bearing plate 14 is slightly larger than the cross-section of the fixing band 4 (in the diagram). Figure 8 The central fixing strap is shown as a separate component.

[0052] In order to attach the fixing strap 4 to the support plate 12, the fixing strap 4 is positioned from above with its position... Figure 8 The end shown below is pushed into the opening defined by the fastening bridge 23 (partial) until the connecting rib 13 at the upper end of the fixing strap 4 is slightly deformed and embedded in the space formed between the two connecting arms 25 on the support plate 12, while the stop 24 formed on the side of the fixing strap 4 is also slightly deformed and abuts against the opening. This achieves a firm connection between the support plate 12 and the fixing strap 4.

[0053] Shoulder strap 4 (see especially) Figure 8 In addition to the connecting rib 13 at the upper end, the stop 24 below it, and the pull strap groove 22 at the lower end, the fastener 18 also has five equidistant rectangular locking notches 15. These locking notches are used to allow the locking protrusions 17 of the fastener 18 to engage with it in a form-fitting manner when the fastener 18 is in use (i.e., the slider 1 is fixed to the support structure 20). The fastener 18 is attached to the back panel 7 of the backpack in a positionally fixed manner by methods and means known in the prior art, such as buckles (e.g., buckles commonly used in orthopedic surgery), snap straps (e.g., snaps commonly used in ski boots), snaps, ratchet mechanisms, or toothed buckles.

[0054] The fastener 18 is equipped with an operating lever 26. When this operating lever is pulled, the locking protrusion 17 is pulled out from the locking recess 15 of the fixing band 4, releasing the entire sliding member 1 and allowing for height adjustment. The fastener 18 has a structural protective structure to prevent accidental damage. The fastener 18 may be damaged if the user pulls the operating lever upwards with excessive force. The operating lever 26, used to form a lock on the fixing band 4, is limited by stops on both sides of the fastener 18 (achieved by two locking protrusions 17 and integrated into the overall shape). Thus, the user can only pull the operating lever 26 upwards to the extent necessary to release the lock.

[0055] Figures 10 to 13b Showing with Figures 1 to 9 Compared to the scheme shown, this is an alternative in terms of functional separation. The common components and functions of these two alternatives will be briefly described below, while their differences will be discussed in detail. In this alternative, the guiding function of the back length adjustment device is physically separated from the fixing function of the adjustment mechanism, a point that will be explained in detail below.

[0056] Figure 10 and Figure 1 Similarly, it shows the entire back panel 7 of the backpack, with the shoulder strap portion 30 forming the shoulder strap 5 displayed in a "transparent" manner (shown in dashed lines) so that the components below can be seen. The waist belt 8 is also displayed in the same way.

[0057] On the back of the shoulder strap portion 30 (facing away from the viewer, i.e., towards the back panel 7), guide rings 28 are sewn at four locations. These guide rings are in the form of straps / webbing (or other textile strips, sewn-on fabric strips, or cloth strips may also be used). The two guide rings 28 on the left and the two on the right engage with flat aluminum strip-shaped support structures 20. The support structures 20 are securely connected to the back panel 7, but gaps are left within their respective guide areas 3 to allow the guide rings 28 to slide up and down. In their upper regions, the support structures 20 extend vertically and parallel to each other; the same is true in their lower regions, but with smaller spacing. In the middle, the two support structures 20 extend obliquely and taper gradually from top to bottom. In the lower region, the support structures 20 are covered by the waist belt, with an air groove between them to allow the guide rings 28 to continue sliding on the support structures 20. In this region, when the back length adjustment device moves fully downward, the lower end of the shoulder strap portion 30 slides between the back panel 7 and the waist belt 8.

[0058] The slider 1 is connected to the shoulder strap portion 30 via four connecting mechanisms 29 in the shape of fabric straps 29, which are guided through four connecting mechanism slots 31 formed on the connector 27 of the slider 1. The slider 1 is used to fix the back length adjustment device to the back panel 7 at different lengths. For this purpose, the design of the slider 1 is similar to that of the first alternative. Figures 1 to 10 The basic structure is the same, except that the guiding function is not performed by the slider 1, but by the shoulder strap part 30, so the guiding groove 11 on it can be omitted. As mentioned above, the slider 1 therefore does not have a shoulder strap groove 6 directly located on it for fastening the shoulder strap 5, but has four connecting mechanism grooves 31.

[0059] exist Figure 10 In the diagram, slider 1 is shown as a single-piece structure; however, in Figures 11a to 13b In the diagram, slider 1 is shown as a two-piece structure, with... Figures 4 to 8 The sliding body 1 is similar to that in the example. Therefore, in addition to the connecting member 27 (corresponding to the bearing plate 12), the sliding body 1 also has a fixing belt 4 (and... Figures 4 to 8 (The fixing strap 4 is basically the same as that in the first option). The fixing strap 4 works together with the fastener 18, which is a fixing mechanism 18, to fix the sliding body 1 at different vertical positions, thereby changing the length of the back length adjustment device. Its movement and fixing method is the same as that of the first option.

[0060] Figure 11a and Figure 11b The diagrams show two states of the slider 1 at different heights on the backplate 7. These diagrams are consistent with... Figure 2a and Figure 2b Similarly. For clarity, Figure 11a and Figure 11bThe structure on the front side of connector 27 is not shown in the image; these structures are... Figure 12 and Figure 13a As can be seen, sliding body 1 moves from... Figure 11a Move to the position shown Figure 11b The method shown is as follows: loosen the fastener 18 (lift it upwards), allowing the fixing strap 4 to slide freely in the vertical direction, and then pull the connector 27 upwards. This can be achieved using the pull strap 21, which is installed on... Figure 10 The pull strap groove 22 shown can also be achieved via the shoulder strap portion 30, for example, by pulling one or both shoulder straps 5 upwards. This allows the guide rings 28 to slide along the strip support structure 20 within the area of ​​the guide region 3. The two lower guide rings 28 are larger than the two upper guide rings 28 because they must be able to wrap around the entire width of the support structure along the downwardly sloping guide region 3. When the desired length is reached, the fastener 18 is pressed down again and works in conjunction with the locking notch 15. Figure 11a and Figure 11b In the middle, no structure for securing with the fastener 18 is shown on the fixing strap 4; instead, the locking notch 15 is only shown in the middle. Figure 12 China (and) Figure 3 and Figure 8 (Similar to the locking notch 15 in the middle).

[0061] Figure 12 The assembly state of the two-piece sliding body 1 (connector 27 and fixing strap 4) is shown. Figure 13a and Figure 13b From the front ( Figure 13a ) and back ( Figure 13b The connector 27 is shown at an enlarged scale. The connection method between the two parts is the same as the first alternative (see...). Figures 3 to 8 The description is the same, that is, the lower end of the fixing strap 4 is pushed from above onto the fastening bridge 23 formed by the connector 27 (corresponding to the description). Figure 3 and Figure 7 Below the fastening bridge member 23, up to the connecting rib 13 formed at the upper end of the fixing band 4 (corresponding to Figure 3 , Figure 7 and Figure 8 The connecting rib in the middle) abuts against the fastening bridge member 23, and passes through the connecting arm 25 formed on the connector 27 (corresponding to the connecting rib in the middle). Figure 3 and Figure 7 The clamping and fixing between the connecting arms 25 in the middle. The reinforcing ribs 14 formed on the connecting member 27 (and) Figure 3 and Figure 7 (Corresponding to the reinforcing rib 14 in the middle) is used to reinforce the connector 27.

[0062] Figure 14a , Figure 14b and Figure 15a , Figure 15bThe connector 27 is shown relative to Figures 11a to 13b The modifications. Figure 14a The front view of connector 27 is shown. Figure 14b The rear view of connector 27 is shown. Figure 15a (Front view) and Figure 15b (Rear view) shows Figure 14a , Figure 14b Perspective view of the modified middle connector 27.

[0063] From a functional perspective, Figures 11a to 13b Implementation methods and Figures 14a to 15b The main difference between the modifications is that connector 27 (as part of slider 1, see...) Figures 11a to 12 ) and shoulder strap section 30 (see also) Figures 11a to 12 The connection is achieved through two seams 33, rather than like... Figure 11a , Figure 11b The fabric strip 29 is used as in the previous embodiment. Therefore, the four connecting slots 31 in other embodiments are no longer necessary and are thus omitted, thereby reducing the width of the connector 27. In order to facilitate the stitching of the thread 33 through the connector 27 made of plastic as much as possible, the back of the connector 27 (see Figure 14b and Figure 15b A stitching groove 32 is provided along the outer edge, and these stitching grooves are formed in the wings 35 extending to the left and right from the central portion 34 (see...). Figure 14b and Figure 15b This means that the suture 33 needs to penetrate less plastic material when passing through the connector 27, making it easier to sew.

[0064] Fixing strap 4 (as in another embodiment, see...) Figures 11a to 12 The fastening bridge 23 is used to mount the connector 27 (not shown) between the connecting arms 25. Unlike another embodiment, the connector 27 here does not have a pull strap groove 22 for mounting the pull strap 21 (see [reference]). Figures 11a to 13b This is not absolutely necessary, so a pull strap groove 22 can also be provided in a modified embodiment; similarly, an additional connecting mechanism groove 31 can also be provided for connecting the connecting part 27 to the shoulder strap part 30 via the stitch 33 and the fabric strip 29.

[0065] The second option (and its two variations) has the same advantages as the first option.

[0066] Compared to existing devices, this invention achieves a significantly simpler height adjustment method while maintaining sufficient force connection. Furthermore, the solutions of this invention (including two alternatives) offer advantages such as material savings, low cost, and ease of production and implementation. They can be easily integrated into existing products, and due to their small number of components, they are easy to replace and maintain.

[0067] List of reference numerals

[0068] 1 sliding body

[0069] 2 shoulder strap area

[0070] 3 Guiding Area

[0071] 4. Fixed area, fixed belt

[0072] 5 shoulder straps

[0073] 6 shoulder strap slots

[0074] 7 backplates

[0075] 8 belts

[0076] 9 guiding institutions

[0077] 10 Wire Section

[0078] 11. Guide receiving part, guide groove

[0079] 12 bearing plates

[0080] 13 connecting ribs

[0081] 14 Reinforcing Ribs

[0082] 15 Locking notches

[0083] 16 locking ribs

[0084] 17 locking protrusions

[0085] 18. Fixing components, fasteners

[0086] 19 Guiding Devices

[0087] 20 Support Structures

[0088] 21 First and second pull straps

[0089] 22 pull belt groove

[0090] 23 Fastening bridge components

[0091] 24 stops

[0092] 25 connecting arms

[0093] 26 control levers

[0094] 27 Connectors

[0095] 28 guide rings

[0096] 29. Connecting mechanism, fabric belt

[0097] 30 shoulder strap section

[0098] 31 Connecting Mechanism Slot

[0099] 32 stitching grooves

[0100] 33 stitches

[0101] 34 Central Part

[0102] 35 Wings

Claims

1. A back length adjustment device for a backpack, comprising a slider (1), a guide device (19), and a fixing element (18). in, The slider (1) has a shoulder strap area (2), a guide area (3) and a fixing area (4). The shoulder strap area (2) of the sliding body (1) has a fastening area that connects to the shoulder strap (5) of the backpack. The guiding device (19) includes a guiding mechanism (9), which works in conjunction with the guiding area (3), and the guiding mechanism is a component of the support structure (20) of the backpack's back panel (7). The guide receiving portion (11) formed on the slider (1) works together with the guide mechanism (9) of the guide device (19) to enable the slider (1) to move along the guide mechanism (9). The fixing element (18) can be securely connected to the back panel (7) of the backpack by means of a connecting device. The fixed area (4) of the sliding body (1) extends in the longitudinal direction of the back panel (7) of the backpack. In this case, the fixed area (4) of the sliding body (1) works together with the fixed element (18) so that when the fixed element (18) is in the adjustment position, the sliding body (1) can move relative to the fixed element (18), and when the fixed element (18) is in the use position, in the fixed position, the fixed area (4) is connected to the fixed element (18) in a force-fit and / or shape-fit manner, so that the sliding body (1) is fixed at the fixed element (18).

2. The back length adjustment device according to claim 1, wherein, The guide mechanism (9) is formed in a straight line, and the fixed area (4) of the sliding body (1) extends parallel to the guide mechanism (9).

3. The back length adjustment device according to claim 1 or 2, wherein, The sliding body (1) has a support plate (12) and a fixing strap (4), wherein the support plate (12) includes the shoulder strap area (2) and the guide area (3), the guide area is preferably formed in the edge area of ​​the support plate (12), the fixing strap (4) includes the fixing area (4), and the support plate (12) and the fixing strap (4) are detachably connected to each other, especially in a force-fit and / or form-fit manner.

4. The back length adjustment device according to claim 1 or 2, wherein, The fastening area has a shoulder strap groove (6), through which the shoulder strap (5) can be guided, and preferably also through the shoulder strap groove, and / or the guiding area (3) has two parallel guiding grooves (11), particularly having a cross-section that is part of an arc and preferably covers more than 180° of the circle, particularly preferably 200° to 270°.

5. The back length adjustment device according to claim 1, wherein, The sliding body (1) has a connector (27) and a shoulder strap portion (30). The connector has a connecting mechanism groove (31) and / or at least one stitching groove (32). The connector and the shoulder strap portion are connected to each other by a connecting mechanism (29) and / or by at least one stitch (33). The connecting mechanism is disposed in the connecting mechanism groove (31). The stitch extends along the at least one stitching groove (32). A guide ring (28) is formed on the shoulder strap portion (30) as a guide receiving portion (11). The guide ring works in conjunction with the guide mechanism (9) of the guide device (19).

6. The back length adjustment device according to claim 5, wherein, The guiding mechanism (9) has two frame elements that are symmetrically formed with respect to the fixed area (4), and the frame elements are part of the load-bearing structure (20) of the back plate (7).

7. The back length adjustment device according to claim 5 or 6, wherein, The guiding mechanism (9) has a region parallel to the fixed region (4) and a region extending at an angle relative to the fixed region.

8. The back length adjustment device according to claim 3, wherein, The support plate (12) and / or the fixing band (4) are respectively constructed as an integral part, and / or the support plate (12) is formed symmetrically with respect to the central axis, and the fixing area (4) extends along the central axis.

9. The back length adjustment device according to claim 5, wherein, The connector (27) is integrally formed, and / or the connector (27) is symmetrically formed with respect to the central axis, and the fixing region (4) extends along the central axis.

10. The back length adjustment device according to claim 1 or 2, wherein, A first pull strap (21) is provided at the end of the fixed area (4) away from the shoulder strap area, and / or a second pull strap (21) is provided at the end of the shoulder strap area (2) away from the fixed area.

11. The back length adjustment device according to claim 1 or 2, wherein, The fixing element (18) has a fastener (18) that is movable between the adjusting position and the fixed position, wherein the fastener is particularly capable of moving out of the fixed position against the spring force.

12. The back length adjustment device according to claim 1 or 2, wherein, The fixing area (4) has locking recesses (15) or locking ribs (16) arranged in particular at equal intervals, especially in the form of racks, and the fixing element (18) has locking protrusions (17) that work together with the locking recesses (15) or locking ribs (16) in a force-fit and / or shape-fit manner.

13. A backpack back panel (7) having a support structure (20) inserted therein and a back length adjustment device formed according to any one of claims 1-12, wherein, The guide area (3) of the back length adjustment device works in conjunction with the support structure (20), and especially with the two parallel wire segments (10) or a strip frame formed therein.

14. The backplate (7) according to claim 13, wherein, The wire section (10) or the strip frame is visible outside the back plate (7) and the rest of the support structure (20) is inside the back plate (7) or covered by a cover plate.

15. A backpack having a back panel (7) formed according to claim 13 or 14.

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