A backpack and lumbar plate assembly for a backpack

Abstract

A lumbar plate assembly for a backpack comprising a lumbar plate for positioning at a wearer's lumbar region in use. The lumbar plate comprises a first engagement portion and a compressible lumbar pad mountable to the lumbar plate for positioning between the lumbar plate and a wearer in use. The lumbar pad comprises a second engagement portion. One of the first and second engagement portions comprises a projection and the other of the first and second engagement portions comprises a recess of receipt of the projection to provide engagement between the lumbar pad and the lumbar plate. Also disclosed is a backpack comprising a polymer support frame including a lumbar plate, upper frame member, and a pair of laterally spaced, elongate lateral frame members that are fixed to the lumbar plate, and that extend upwardly from the lumbar plate to the upper frame member.

Description

Technical Field

[0001] The present disclosure relates to a backpack, a support frame for the backpack and a lumbar plate assembly.Background

[0002] Backpacks typically include a compartment (or several compartments) for storage, and a harness system allowing a user to carry the backpack. Such harness systems commonly include shoulder straps, a chest strap, and a hip belt (especially in backpacks used for outdoor activities, such as hiking). The hip belt allows at least some (and often a significant amount) of the load held by the backpack to be transferred through a wearer's hips.

[0003] To aid in the distributing this load, and to provide stability, some backpacks include a frame. This is sometimes in the form of a thin piece of plastic that sits against (or is close to) the back of a wearer. In other backpacks it is known to provide a frame of aluminium tubing.

[0004] In some cases, backpack frames are designed to provide ventilation between the wearer's back and the backpack. This can be achieved by a mesh panel that sits against the wearer's back, with the backpack (i.e. the main body of the backpack) being spaced from the mesh to create a cavity for airflow between the backpack and the wearer. However, such an arrangement means that the load is moved further away from the wearer, and this can have a negative impact on stability in use.Summary

[0005] In a first aspect, there is disclosed a lumbar plate assembly for a backpack comprising: a lumbar plate for positioning at a wearer's lumbar region in use, the lumbar plate comprising a first engagement portion; and a compressible lumbar pad mountable to the lumbar plate for positioning between the lumbar plate and a wearer in use, the lumbar pad comprising a second engagement portion; wherein one of the first and second engagement portions comprises a projection and the other of the first and second engagement portions comprises a recess of receipt of the projection to provide engagement between the lumbar pad and the lumbar plate.

[0006] Such an arrangement may provide secure mounting between the lumbar pad and the lumbar plate. In some cases, the engagement between the lumbar pad and the lumbar plate may avoid the need to use adhesive to adhere the lumbar pad to the lumbar plate (providing both cost savings and environmental benefits).

[0007] Likewise, receipt of the projection in the recess may facilitate alignment of the lumbar pad on the lumbar plate. Correct alignment may maximise comfort for a wearer of a backpack including the lumbar plate assembly.

[0008] Optional features of the first aspect will now be set out. These are applicable singly or in any combination with any aspect.

[0009] The projection may be in the form of a ridge and the recess may be in the form of a groove. The ridge may be formed on the lumbar plate. The groove may be formed on the lumbar pad (e.g. in an underside of the lumbar pad).

[0010] Each of the ridge and groove may extend along a respective annular path. Each annular path may be racetrack shaped (i.e. obround).

[0011] In some embodiments, the ridge may be formed on the lumbar pate, and may at least partly surround (e.g. may fully surround) an aperture formed in the lumbar plate.

[0012] The projection may be configured to engage the recess so as to be restricted from withdrawal from the recess (e.g. by positive engagement). For example, the projection may comprise a stem and an enlarged head. The recess may comprise an aperture through which the stem can extend when the lumbar pad is mounted to the lumbar plate. The enlarged head may be configured to restrict withdrawal of the projection back through the aperture (e.g. the enlarged head may be larger in cross-sectional area than the aperture). The enlarged head may be compressible.

[0013] The projection may be formed on the lumbar pad and the aperture may be formed in the lumbar plate. In such embodiments, and where the projection includes an enlarged head, the head may be compressible (i.e. for insertion through the aperture) due to the compressible nature of the lumbar pad.

[0014] A distal portion of the projection may be tapered to guide the projection into the recess. For example, the distal portion may be conical or frustoconical.

[0015] The lumbar plate assembly may comprise a plurality of projections (e.g. ridges and / or projections having enlarged heads). The lumbar plate assembly may comprise a plurality of recesses (e.g. grooves and / or apertures).

[0016] The lumbar pad may comprise a lattice structure (e.g. a three-dimensional lattice structure). The lattice structure may comprise a plurality of struts connected at nodes. The lattice structure may comprise a repeating pattern of struts and nodes. The struts may be configured deform to permit compression of the lumbar pad.

[0017] The lumbar pad may comprise foam. The lumbar pad may comprise a plurality of foam layers. The lumbar pad may comprise an inner foam layer adjacent to (or proximate to) the lumbar plate. The inner foam layer may be mounted to (or mountable to) the lumbar plate. The lumbar pad may comprise an outer foam layer distal from the lumbar plate. The outer foam layer may be mounted (e.g. directly) to the inner foam layer.

[0018] The inner foam layer may have a greater hardness (e.g. may be firmer) than the outer foam layer. The inner foam layer may have a higher density than the outer foam layer.

[0019] Hardness may, for example, be determined by compressing the layer of foam to 40% of its original size and determining the force required to achieve such compression (e.g. the higher the force, the harder the foam).

[0020] Such an arrangement of foam layers may provide for more effective mounting of the lumbar pad to the lumbar plate, while maintaining compressibility (i.e. the harder inner foam layer providing for a rigid connection with the lumbar plate, while the softer outer layer of foam provides comfort in use).

[0021] The second engagement portion may comprise a first opening formed in the inner foam layer. The outer foam layer may comprise a second opening aligned with the first opening. The lumbar plate may comprise an aperture aligned with the first opening. Such an arrangement may allow for airflow through both the lumbar plate and the lumbar pad.

[0022] In some embodiments, the inner foam layer may comprise a plurality of openings. In such embodiments, the outer foam layer may comprise fewer openings than the inner foam layer. In embodiments where the inner foam layer is harder than the outer foam layer, the inner foam layer may be able to support more openings than the outer foam layer without detriment to the structural integrity of the foam layer.

[0023] The lumbar pad may be a first lumbar pad. The lumber plate assembly may comprise a second lumbar pad laterally spaced from the first lumbar pad. The first and second lumbar plates may be separate lumbar pads or may be portions of a single component.

[0024] Each of the first and second lumbar pads may comprise an outer surface that faces the wearer in use. The outer surfaces may be angled towards one another. That is, an angled formed between the outer surfaces may be less than 180 degrees (or e.g. less than 160 degrees). Accordingly, the outer surfaces of the lumbar pads may, together, form a V-shape. The outer surface of each lumbar pad may be convex in a plane that is perpendicular to the lateral direction.

[0025] The lumbar plate may comprise an outer surface that faces the wearer in use. The outer surface may be convex (e.g. in a plane that is perpendicular to the lateral direction). In this way, the lumbar plate may follow the natural curve of the lumbar region of a wearer's spine.

[0026] An inner surface of the lumbar plate may be concave in a plane that is perpendicular to the lateral direction. The lumbar plate may be curved (in a plane that is perpendicular to the lateral direction).

[0027] The lumbar plate may be substantially rigid (e.g. may be formed of a rigid material). The lumbar plate may be more rigid than the lumbar pad(s). That is, the lumbar plate may be formed of a non-fabric material.

[0028] The lumbar plate and / or lumbar pad(s) may be as described (may include one or more optional features of) below with respect to the second aspect.

[0029] In a second aspect, there is disclosed a backpack comprising: a body defining a compartment for storing items; a polymer support frame mounted to the body and comprising: a lumbar plate for positioning at a wearer's lumbar region in use; an upper frame member spaced from the lumbar plate in an in use upwards direction so as to define an opening therebetween; and a pair of laterally spaced, elongate lateral frame members that are fixed to the lumbar plate, and that extend upwardly from the lumbar plate to the upper frame member; and a flexible panel extending from the upper frame member to the lumbar plate, across the opening in the support frame, so as to provide a surface for contact with the back of a wearer in use, the flexible panel at least partly spaced from the body of the backpack by the support frame.

[0030] The provision of a flexible panel which contacts the back of a wearer and that is spaced from the body of the backpack allows for a flow of air between the wearer and the body of the backpack. This can help to maintain a wearer's back at a lower temperature (and can thus reduce sweating in use).

[0031] The provision of a frame formed of a polymer can provide for better control of the shape of the support frame, meaning that the spacing between the body of the backpack can be better controlled. This ensures adequate airflow while minimising the distance of the backpack from a wearer in order to provide stability. Likewise, the provision of lateral frame members that are fixed to a lumbar plate aids in transfer of load from the body of the backpack to the lumbar plate and ultimately to the hips / legs of a wearer. Even further, the use of a polymer frame (and lateral frame members that are elongate) can allow some flex (e.g. twisting) in the frame, which can provide further comfort in use.

[0032] For the avoidance of doubt, the terms "upwards" and "upwardly" as used herein are not intended to restrict the backpack to any particular orientation other than in normal use of the backpack (i.e. when the backpack is worn by a person that is standing vertically).

[0033] Similarly, the term "laterally" is intended to refer to a direction that is generally horizontal in normal use (i.e. when the backpack is worn).

[0034] Optional features of the second aspect will now be set out. These are applicable singly or in any combination with any aspect.

[0035] Each lateral frame member may be integrally formed with the lumbar plate (so as to form a unitary piece). Integrally forming the lumbar plate with the lateral frame members can provide a more rigid connection so as to facilitate the transfer of load from the body of the backpack to the lumbar plate (and ultimately to e.g. the hips of a wearer).

[0036] The upper frame member may connect the lateral frame members (i.e. may extend from one lateral frame member to the other). The upper frame member may connect distal ends of the lateral frame members (the distal ends being ends of the lateral frame members that are distal from the lumbar plate).

[0037] In this way, the upper frame member and lateral frame members may form a U-shaped frame. Likewise, this arrangement of the frame members means that the frame members and lumbar plate fully surround (and define) the periphery of the opening. Thus, the support frame may be fully open between the lumbar plate, lateral frame members, and the upper frame member.

[0038] The upper member may be integrally formed with one or both of the lateral frame members. Accordingly, in some embodiments, the lumbar plate, lateral frame members and upper frame members may form a single unitary piece. The single unitary piece may, for example, be injection moulded or e.g. formed via additive manufacture.

[0039] Integrally forming the upper frame member with the lateral frame members can provide a more rigid structure, which aids in both load transfer and stability.

[0040] At least one of (e.g. all of) the lumbar plate, lateral frame members and upper frame member may be formed of a plastic such as polypropylene.

[0041] At least one of the lateral frame members (e.g. both lateral frame members) may have a length of between 30 and 70 cm, or e.g. 40 and 60 cm. The length may be taken as the straight-line distance between opposite proximal (proximate the lumbar plate) and distal (distal from the lumbar plate) ends of the lateral frame member.

[0042] At least one of the (lateral or upper) frame members (e.g. each frame member) may comprise a recessed surface (e.g. at least one frame member may comprise an elongate recess formed therein). The recess may be formed in a rear surface of the at least one frame member (i.e. facing towards the body of the backpack in use). The recess may open to the rear of the at least one frame member. The recess may extend for substantially the entire length of the at least one frame member. The at least one frame member may thus have e.g. a V- or U-shaped transverse cross-sectional shape. The at least one frame member may comprise a plurality of strengthening ribs extending across the recess (e.g. in a truss pattern).

[0043] Such an arrangement may reduce the weight of the support frame while ensuring sufficient rigidity for load transfer and stability.

[0044] At least one of the lateral frame members (e.g. both lateral frame members) may be configured to space the body of the backpack away from the flexible panel (and e.g. away from the wearer).

[0045] At least one of the lateral frame members (e.g. both lateral frame members) may be concave in a plane that is perpendicular to the lateral direction. At least one of the frame members (e.g. both lateral frame members) may be configured such that proximal and / or distal ends of the lateral frame member are forward of (i.e. in an in-use orientation) an intermediate portion between the proximal and distal ends. The term "forward" is used here to indicate the direction in which a wearer would face when wearing the backpack in normal use. Thus, in the context of the proximal / distal ends of the frame members, one or both may be closer to the wearer (and e.g. further from a centre of the body of the backpack) than the intermediate portion in use.

[0046] Each lateral frame member may comprise a distal portion at the distal end of the lateral frame member. Each lateral frame member may comprise a proximal portion at the proximal end of the lateral frame member. The intermediate portion may be interposed between the proximal and distal portions. At least one of the lateral frame members (e.g. both lateral frame members) may be configured such that one or both of the proximal and distal portions extend from the intermediate portion at an angle (e.g. in a plane that is perpendicular to the lateral direction). The angle may be such that the proximal or distal portion extends at least partly in the forward direction from the intermediate portion.

[0047] The angle of the distal portion (of one or both of the lateral frame members) relative to the intermediate portion may be from 120 degrees to 170 degrees, or e.g. from 130 to 160 degrees (in a plane that is perpendicular to the lateral direction). The angle of the proximal portion (of one or both of the lateral frame members) relative to the intermediate portion may be from 120 degrees to 170 degrees, or e.g. from 130 to 170 degrees (in a plane that is perpendicular to the lateral direction).

[0048] Accordingly, the lumbar plate may be forward of the intermediate portion. Likewise, the upper frame member may be forward of the intermediate portion. The lumbar plate and / or upper frame member may be a forwardmost part of the support frame.

[0049] In general, the support frame may have an S-shaped profile in a plane that is perpendicular to the lateral direction.

[0050] As the flexible panel extends from the upper frame member to the lumbar pad, such an arrangement means that at least a portion of the flexible panel, such as a central portion of the flexible panel, may also be forward of (e.g. further away from the body of the backpack than) the intermediate portions of the lateral frame members. The flexible panel may therefore ensure that the wearer's back is positioned away from the body of the backpack. Accordingly, air may flow between the flexible panel and the body of the backpack, to cool the back of a wearer.

[0051] The intermediate portion of one or both of the frame members may be substantially linear (i.e. straight) in a plane that is perpendicular to the lateral direction. This may mean that the compartment of the body of the backpack has a more usable shape. Likewise, such a shape may provide a more consistent gap / space between the body of the backpack and the flexible panel. This may ensure sufficient air is able to pass between the body of the backpack and the flexible panel while maintaining stability by keeping the body of the backpack close to the wearer.

[0052] For example, the distance between the flexible panel and the body of the backpack (at a point located centrally in the opening defined by the support frame) may be between 2 cm and 8 cm, or e.g. between 3 cm and 6 cm, or e.g. may be about 4 cm.

[0053] In some embodiments, a planar support structure (e.g. a planar board) may be provided between the compartment of the backpack and the support frame (e.g. within a lining of the body of the backpack). This may provide further support and may further ensure the shape of the compartment is such that it provides a usable space.

[0054] The flexible panel may be air permeable (e.g. may be formed of an air permeable / breathable material). The flexible panel may be formed of a mesh. This may facilitate cooling of a wearer's back in use.

[0055] The flexible panel may be elastic (e.g. may be more elastic than the frame members and / or the lumbar plate). That is, the flexible panel may be formed of an elastic material (i.e. the flexible panel may be stretchable). The flexible panel may be stretched across the upper member and the lumbar plate (e.g. stretched across the opening defined by the support frame). Thus, the flexible panel may be placed under tension (e.g. may function in the manner of a trampoline). This may allow the flexible panel to conform to a wearer's back while also providing some resistance to deformation.

[0056] The flexible panel may be fixed to the body of the backpack along a periphery of the flexible panel. The flexible panel and body may thus form a pocket therebetween, into which the support frame is received (i.e. the support frame may be mounted to the body by receipt in the pocket).

[0057] At least a portion of the flexible panel may be releasably fixed to the body of the backpack. This may allow opening and closing of the pocket for insertion (and then containment) of the support frame.

[0058] At least a portion of the periphery of the flexible panel may be unattached to the body (e.g. may be spaced from the body). The periphery of the flexible panel may comprise two such unattached portions which may be arranged on opposite lateral sides of the flexible panel. This may form openings for airflow between the flexible panel and the body of the backpack (e.g. an airflow that flow laterally across the flexible panel).

[0059] The backpack may comprise shoulder straps. The shoulder straps may comprise upper ends connected to the body of the backpack. The upper frame member may be located at or above the upper ends of the shoulder straps.

[0060] The upper ends of the shoulder straps may be connected to the body of the backpack by a laterally extending element (e.g. strap). Opposite ends of the laterally extending element may be fixed to the body of the backpack. A central region of the laterally extending element, between the opposite ends, may be unattached to the body (i.e. may not be fixed to the body). The flexible panel may extend between the laterally extending element and the body of the backpack.

[0061] The backpack may comprise a hip belt. The hip belt may connect to the body of the backpack at locations proximate to the lumbar plate (and lumbar pad(s)).

[0062] The lumbar plate may comprise an outer surface that faces a wearer in use (i.e. is forward facing). The outer surface may be convex in a plane that is perpendicular to the lateral direction. In this way, the lumbar plate may follow the natural curve of the lumbar region of a wearer's spine.

[0063] An inner surface of the lumbar plate may be concave in a plane that is perpendicular to the lateral direction. The lumbar plate may be curved (in a plane that is perpendicular to the lateral direction).

[0064] The lumbar plate may comprise one or more apertures formed therein. The one or more apertures may be in the form of one or more slots. The one or more slots may extend in an upward direction along the lumbar plate. The one or more apertures / slots may facilitate airflow through the lumbar plate.

[0065] The backpack may comprise a lumbar pad mounted to the lumbar plate. The lumbar pad may be mounted to the outer surface of the lumbar plate.

[0066] The lumbar pad and / or lumbar plate may be as described above with respect to the first aspect (e.g. may include one or more features of the lumbar pad and / or lumbar plate of the first aspect). Thus, the backpack of the second aspect may include the lumbar plate assembly of the first aspect.

[0067] For example, the lumbar pad may be a first lumbar pad. The backpack may comprise a second lumbar pad laterally spaced from the first lumbar pad. The first and second lumbar plates may be separate lumbar pads or may be portions of a single component.

[0068] Each of the first and second lumbar pads may comprise an outer surface that faces the wearer in use. The outer surfaces may be angled towards one another. That is, an angle formed between the outer surfaces may be less than 180 degrees (or e.g. less than 160 degrees). Accordingly, the outer surfaces of the lumbar pads may, together, form a V-shape. When arranged in this manner, the flexible panel may form a bridge across the first and second lumbar pads. This may provide additional comfort for a wearer.

[0069] In a third aspect, there is provided a polymer support frame comprising: a lumbar plate for positioning at a wearer's lumbar region in use; an upper frame member spaced from the lumbar plate in an in-use upwards direction so as to define an opening therebetween; and a pair of laterally spaced, elongate lateral frame members that are fixed to the lumbar plate, and that extend upwardly from the lumbar plate to the upper frame member.

[0070] The support frame of the third aspect may be as described in the second aspect (i.e. the support frame of the third aspect may include one or more features of the support frame described above in the second aspect).

[0071] In a fourth aspect, there is provided a backpack comprising a lumbar plate assembly according to the first aspect. The backpack may comprise shoulder straps. The shoulder straps may comprise upper ends connected to the body of the backpack. The backpack may comprise a hip belt. The hip belt may connect to the body of the backpack at locations proximate to the lumbar plate (and lumbar pad(s)).Brief Summary of the Figures

[0072] Embodiments will now be discussed with reference to the accompanying figures in which: Figure 1A is a side view of a backpack; Figure 1B is a rear view of the backpack of Figure 1A; Figure 2A is a front view of a support frame of the backpack of Figure 1A; Figure 2B is a rear view of the support frame of Figure 2A; Figure 2C is a side view of the support frame of Figure 2A; Figure 2D is a detailed view of a lumbar plate of the support frame of Figure 2A; Figures 3A and 3B are respective rear and front views of a lumbar pad for use with the backpack of Figure 1A; Figures 4A and 4B are schematic views illustrating assembly of the lumbar pad of Figures 3A and 3B onto the support frame of Figure 2A; Figure 5 is a schematic view of a variant lumbar pad; and Figure 6 is a schematic view of a further variant lumbar pad. Detailed Description

[0073] Aspects and embodiments will now be discussed with reference to the accompanying figures. Further aspects and embodiments will be apparent to those skilled in the art.

[0074] Figures 1A and 1B show a backpack 10 that includes a body 11 that defines a compartment for storing items. The backpack 10 also includes shoulder straps 12, each of which extends from an upper in-use end of the backpack 10 to a lower end of the backpack 10. In particular, an upper end 13 of each strap 12 is connected to the body 11 of the backpack 10 via a strap 14 which extends laterally across the body 11. The backpack 10 further includes a hip belt 15 and a chest strap 16.

[0075] As is best seen in Figure 1B, the side of the backpack 10 that faces towards a wearer's back in use (typically referred to as the "back" of a backpack), comprise a flexible panel 17 formed of an air permeable mesh. The flexible panel 17 extends across the majority of the back side of the body 11 of the backpack 10. The periphery of the flexible panel 17 is attached to the body 11, while a central region of the flexible panel 17 remains unattached such that a pocket 22 is formed between the flexible panel 17 and the body 11.

[0076] Although not apparent from the figures, an upper edge 18 of the flexible panel 17 is releasably attached to the body 11 so as to be openable for access into the pocket 22 defined between the flexible panel 17 and the body 11. Likewise, two lateral edge regions 20 of the flexible panel 17 also remain unattached to the body 11 which creates lateral airflow openings 21. In use, air is able to flow into and out of the pocket 22 through these lateral airflow openings 21 which can help to cool the back of a wearer in use.

[0077] As will be described in more detail, this airflow is somewhat facilitated by the provision of a plastic (in this case, polypropylene) support frame 23 which is located in the pocket 22 so as to be retained between the flexible panel 17 and the body 11 of the backpack 10.

[0078] The support frame 23, which is provided to facilitate the transfer of load from the backpack 10 to the wearer (e.g. the wearer's hips), is best shown in Figures 2A, 2B, 2C and 2D. The support frame 23 includes a lumbar plate 24, a pair of laterally spaced, elongate lateral frame members 25, and an upper frame member 26.

[0079] Each lateral frame member 25 includes a proximal end 27 at which the lateral frame member 25 is integrally formed with the lumbar plate 24, and extends from the proximal end 27 upwardly (in-use) to a distal end 28. The upper frame member 26 extends between, and connects, the distal ends 28 of the two lateral frame members 25. The upper frame member 26 is integrally formed with the lateral frame members 25, such that the upper frame member 26, lateral frame members 25 and the lumbar plate 24 form a unitary piece. Forming the support frame 23 as a unitary piece improves the ability of the support frame 23 to transfer load from the body 11 to the wearer (via the lumbar plate 24).

[0080] As is best seen in Figure 2B, a rear side of the support frame 23 is recessed. In particular, elongate recesses 29 extend along each of the upper frame member 26 and two lateral frame members 25, such that each of the frame members 25, 26 has a U-shaped transverse cross-sectional profile. A plurality of strengthening ribs 30, arranged in a truss-like pattern, are provided within the recesses 29 in order to provide additional strength to the frame members 25, 26. In this way, the weight of support frame 23 is reduced (reducing the load that must be carried by a wearer), but the support frame 23 is still able to effectively transfer load from the body 11 to the wearer.

[0081] Figure 2C provides a side view of the support frame 23. As should be apparent from this figure, each of the lateral frame members 25 has a concave shape in a plane that is perpendicular to the lateral direction (i.e. a plane parallel with the page in the context of Figure 2C). Each lateral frame member 25 includes a proximal portion 31 (at the proximal end 27), a distal portion 32 (at the distal end 28), and an intermediate portion 33 that is interposed between the proximal 31 and distal 32 portions. Both the proximal portion 31 and distal portion 32 of each lateral frame member 25 extend from the intermediate portion 33 at an angle. In particular, in an in-use orientation, the intermediate portion 33 extends vertically and each of the proximal 31 and distal 32 portions extend in a partly forward direction from the intermediate portion 33.

[0082] Also apparent from Figure 2C is that an outer surface 34 of the lumbar plate 24 is convex. This means the lumbar plate 24 generally follows the natural curve of a wearer's spine, which improves comfort. A pair of laterally spaced lumbar pads 35 are mounted to the convex outer surface 34 of the lumbar plate 24 (these are not shown in Figures 2A and 2B, but can be seen in Figure 1A). The lumbar pads 35 are configured to compress in use to provide additional comfort for a wearer.

[0083] When the support frame 23 is received in the pocket 22 formed by the flexible panel 17, the flexible panel 17 stretches over the support frame 23 so as to be placed under tension by the support frame 23. In particular, a central portion of the flexible panel 17 effectively forms a bridge between the upper frame member 26 and the lumbar pads 35, which project further forward than the remainder of the support frame 23 and thus act as high points. This results in a portion of the flexible panel 17 being spaced forwardly of the intermediate portions of the 33 of the lateral frame members 25 and the body 11 of the backpack 10. This creates a space 36 between the body 11 of the backpack 10 and the flexible panel 17 through which air is able to flow. At the same time, the flexible panel 17 (because it is placed under tension) acts like a trampoline, so as to conform to a wearer's back when the backpack 10 is worn.

[0084] Providing each lateral frame member 25 with a substantially linear intermediate portion 33 helps to maintain a planar surface on the rear of the body 11 of the backpack 10 (i.e. facing the flexible panel). This can provide a more usable space within the compartment of the body 11. Likewise, the linear intermediate portion 33 provides a consistent gap between the body 11 and the flexible panel 17. In this illustrated embodiment, the distance between the flexible panel 17 and body 11 is about 4 cm (at a central region of the flexible panel 17), which can provide sufficient airflow for cooling, while maintaining stability (i.e. by ensuring the body 11 and the load held therein, is still close to the wearer's back).

[0085] To ensure minimal contact between the support frame 23 and the wearer, and to maximise the extent of the flexible panel 17, the lateral frame members 25 are sufficiently long such that the upper frame member 26 is positioned above the connection between the body 11 and the upper ends 13 of the shoulder straps 12. This is at least partly facilitated by the provision of the laterally extending strap 14 for connection of the shoulder straps 12 to the body, which allows the flexible panel 17 to pass thereunder.

[0086] Figure 2D provides a more detailed view of the lumbar plate 24. The lumbar plate 24 includes a central aperture 37 and two sets 38 of three apertures 39 spaced either side of the central aperture 37. Each aperture 37, 39 is in the form of an elongate slot that extends through the lumbar plate 24 and that is elongate in the upward (i.e. vertical) direction.

[0087] Each of the apertures 37, 39 includes an engagement portion in the form of a ridge 40 (or lip) that extends around a periphery of the aperture 37, 39 (each ridge 40 extending along a generally obround / race-track shaped path). As will be described further below, these ridges 40 facilitate assembly of the lumbar pads 35 onto the lumbar plate 24.

[0088] One of the two lumbar pads 35 is shown in more detail in Figures 3A and 3B (it should be appreciated that the lumbar pads 35 are substantially the same, except one is a mirror image of the other). The lumbar pad 35 has a three-dimensional lattice structure formed of a repeating pattern of struts 41 connected at nodes 42. The lumbar pad 35 is formed by additive manufacture. In use, the lattice structure is able to collapse (by deformation of the struts 41) such that the lumbar pad 35 compresses to provide comfort to a wearer of the backpack 10.

[0089] The underside 43 of the lumbar pad 35, shown in Figure 3A, is substantially planar (pre-mounting), except for three engagement portions in the form of racetrack-shaped (i.e. obround) grooves 44 formed therein. As may be appreciated, these grooves 44 are complementary in shape to the ridges 40 formed on the lumbar plate 24, which (as will now be explained), facilitates assembly of the lumbar pad 35 to the lumbar plate 24.

[0090] Figures 4A and 4B schematically illustrate such assembly. To mount the lumbar pads 35 to the lumbar plate 24, the grooves 44 formed in the undersides 43 of the lumbar pads 35 are aligned with the ridges 40 provided on the outer surface 34 of the lumbar plate 24. The lumbar pads 35 are then positioned on the lumbar plate 24 such that the ridges 40 are received in the grooves 44. In addition to the ridges 40 being received in the grooves 44, portions 45 of the lumbar pads 35 are received in recesses 46 formed between the ridges 40 (and between the apertures 39). This arrangement aids in retaining the lumbar pads 35 on the lumbar plate 24 and restricts movement of the lumbar pads 35 relative to the lumbar plate 24 in the plane of the outer surface 34. In some circumstances, this mounting may be sufficient to retain the lumbar plate 24, but in other circumstances adhesive may be used to further retain the lumbar pads 35 on the lumbar plate.

[0091] To aid in alignment of the grooves 44 with the ridges 40, each ridge 40 has a sloped surface (facing a respective aperture 37, 39), which guides the ridge 40 into a respective groove 44.

[0092] When mounted, as shown in Figure 4B, the central aperture 37 remains open, which facilitates airflow through the lumbar plate 24. While air is unable to flow through the remaining apertures 39, the presence of these apertures 39 reduces the weight of the lumbar plate 24 (and thus the support frame 23).

[0093] Figures 4A and 4B also show the profile of each lumbar pad 35. A forward-facing surface 47 of each lumbar pad 35 is sloped relative to the underside 43 of the respective lumbar pad 35. As previously mentioned, the lumbar pads 35 are configured such that one is a mirror image of the other (about a plane that is perpendicular to the lateral direction and extends centrally between the lumbar pads 35). As a result, the forward-facing surfaces 47 of the lumbar pads 35 slope towards one another (together, forming a V-shape).

[0094] When the flexible panel 17 is stretched over the support frame 23 (and the lumbar pads 35), the sloped surfaces 47 of the lumbar pads 35 mean that a "bridge" is formed by the flexible panel 17 between the lumbar pads 35 (this can be seen in Figure 4B). This bridged portion of the flexible panel 17 provides additional comfort to a wearer.

[0095] To increase comfort even further, each lumbar pad 35 has a depression 48 that extends around the entire periphery of the lumbar pad 35. This promotes collapse of the lumbar pad 35 in use, by allowing an upper portion of the lumbar pad 35 to fold.

[0096] Figures 5 and 6 depict variant lumbar pads 35. For brevity, only differences will be described in relation to these variants.

[0097] The lumbar pad 35' of Figure 5 differs from that previously described in that, in addition to grooves 44, the underside 43 of the lumbar pad 35' includes projections 49 that project therefrom. Each projection 49 includes a stem 50 and an enlarged head 51 at a distal end of the stem. Each head 51 includes a tapered distal surface 52, such that each projection 49 has a generally arrow-shaped profile.

[0098] To assemble the lumbar pad 35' onto the lumbar plate 24 the projections 49 are inserted into the apertures 39 of the lumbar plate 24. As the projections 49 are inserted, the enlarged heads 51 of the projections 49 collapse (to allow passage through the apertures 39). Once fully received through the apertures 39, the enlarged heads 51 expand again and engage an underside 53 of the lumbar plate 24. This prevents the projections 49 from being removed from the apertures 39, and thus retains the lumbar pad 35' on the lumbar plate 24. In this way, the lumbar pad 35' may be retained on the lumbar plate 24 without adhesive.

[0099] The lumbar pad 35" of Figure 6 differs in that it is formed of a multilayer foam assembly rather than a lattice structure. In particular, the lumbar pad 35" includes an inner 54 and outer 55 layer of foam, the inner layer 54 being that which is in contact with the lumbar plate 24 when assembled. The inner layer 54 of foam is harder (or firmer) than the outer layer 55 (and may be of greater density than the outer layer 55). This provides a more rigid connection between the lumbar plate 24 and the lumbar pad 35", while maintaining suitable compression (provided by the outer layer 55) for comfort.

[0100] For mounting the lumbar pad 35" to the lumbar plate 24, the inner layer 54 of foam is provided with a plurality of openings 56. These openings 56 (which are obround / race-track shaped) align over the apertures 39 formed in the lumbar plate 24. In particular, the openings 56 are configured such that the ridges 40 formed on the lumbar plate 24 engage therein (to facilitate mounting of the lumbar pad 35" to the lumbar plate 24 as described previously). The lumbar pad 35" may additionally be adhered to the lumbar plate 24 if required.

[0101] The outer layer 55 of the lumbar pad 35" also includes an opening 57, which aligns with a central opening 39 of the inner layer 54. This allows for airflow through the lumbar pad 35" and through an aperture 39 of the lumbar plate 24.

[0102] As may be appreciated, the foam lumbar pad 35" of Figure 6 could alternatively incorporate the projections 49 of the lumbar pad 35' of Figure 5.

[0103] The exemplary embodiments set forth above are considered to be illustrative and not limiting. Various changes to the described embodiments may be made without departing from the spirit and scope of the invention.

[0104] For the avoidance of any doubt, any theoretical explanations provided herein are provided for the purposes of improving the understanding of a reader. The inventors do not wish to be bound by any of these theoretical explanations.

[0105] Throughout this specification, including the claims which follow, unless the context requires otherwise, the word "comprise" and "include", and variations such as "comprises", "comprising", and "including" will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

[0106] It must be noted that, as used in the specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from "about" one particular value, and / or to "about" another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by the use of the antecedent "about," it will be understood that the particular value forms another embodiment. The term "about" in relation to a numerical value is optional and means for example + / - 10%.

Claims

1. A lumbar plate assembly for a backpack comprising: a lumbar plate for positioning at a wearer's lumbar region in use, the lumbar plate comprising a first engagement portion; and a compressible lumbar pad mountable to the lumbar plate for positioning between the lumbar plate and a wearer in use, the lumbar pad comprising a second engagement portion; wherein one of the first and second engagement portions comprises a projection and the other of the first and second engagement portions comprises a recess of receipt of the projection to provide engagement between the lumbar pad and the lumbar plate.

2. The lumbar plate assembly according to claim 1, wherein the projection is in the form of a ridge and the recess is in the form of a groove.

3. The lumbar plate assembly according to claim 2, wherein each of the ridge and groove extend along a respective annular path, optionally wherein each annular path is racetrack shaped.

4. The lumbar plate assembly according to claim 1, wherein the projection comprises a stem and an enlarged head at a distal end of the stem, and the recess is an aperture through which the stem can extend when the lumbar pad is mounted to the lumbar plate, the enlarged head being configured to restrict withdrawal of the projection back through the aperture, and optionally wherein the projection is formed on the lumbar pad and the aperture is formed in the lumbar plate.

5. The lumbar plate assembly according to any one of the preceding claims, wherein a distal portion of the projection is tapered to guide the projection into the recess.

6. The lumbar plate assembly according to any one of the preceding claims, wherein the lumbar pad comprises a three-dimensional lattice structure comprising a repeating pattern of struts connected at nodes.

7. The lumbar plate assembly according to claim 1, wherein the lumbar pad comprises an inner foam layer adjacent to the lumbar plate, and an outer foam layer distal from the lumbar plate, and wherein the inner foam layer has a greater hardness than the outer foam layer, and optionally wherein the recess is in the form of a first opening formed in the inner foam layer, the outer foam layer comprises a second opening aligned with the first opening, and the lumbar plate comprises an aperture aligned with the first opening.

8. The lumbar plate assembly according to any one of the preceding claims, wherein the lumbar pad is a first lumbar pad and the lumbar plate assembly comprises a second lumbar pad laterally spaced from the first lumbar pad, and optionally wherein each of the first and second lumbar pads comprises an outer surface that faces the wearer in use, and wherein the outer surfaces are angled towards one another.

9. The lumbar plate assembly according to any one of the preceding claims wherein the lumbar plate comprises an outer surface that faces the wearer in use, and wherein the outer surface is convex.

10. A backpack comprising: a body defining a compartment for storing items; a polymer support frame mounted to the body and comprising: a lumbar plate for positioning at a wearer's lumbar region in use; an upper frame member spaced from the lumbar plate in an in-use upwards direction so as to define an opening therebetween; and a pair of laterally spaced, elongate lateral frame members that are fixed to the lumbar plate, and that extend upwardly from the lumbar plate to the upper frame member; and a flexible panel extending from the upper frame member to the lumbar plate, across the opening in the support frame, so as to provide a surface for contact with the back of a wearer in use, the flexible panel at least partly spaced from the body of the backpack by the support frame.

11. The backpack according to claim 10, wherein each lateral frame member is integrally formed with the lumbar plate.

12. The backpack according to claim 10 or 11, wherein the upper frame member connects the lateral frame members, and optionally wherein the upper frame member is integrally formed with each of the lateral frame members.

13. The backpack according to any one of claims 10 to 12, wherein at least one of the lateral frame members is concave in a plane that is perpendicular to the lateral direction.

14. The backpack according to any one of claims 10 to 13, wherein each lateral frame member comprises a proximal portion proximate the lumbar plate, a distal portion distal from the lumbar plate, and an intermediate portion interposed between the proximal and distal portions, and wherein at least one of the lateral frame members is configured such that the proximal and / or distal portion extends at an angle to the intermediate portion, and optionally wherein the intermediate portion is substantially linear in a plane that is perpendicular to the lateral direction.

15. The backpack according to any one of claims 10 to 14, wherein the flexible panel is air permeable.

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