This invention relates generally to backpacks, and, in particular, to backpacks having improved lumbar support.
Backpacks for carrying items such as books, clothing, and other personal items are well known. Backpacks typically comprise a large central compartment into which the items are placed. Additional compartments and pockets may also be provided to separate items within the backpack. The backpack is typically outfitted with a pair of shoulder straps, and may also have a hip strap, each of which are attached to the backpack and are used by the wearer to carry the backpack.
Such backpacks are known as frameless backpacks, since they have no frame upon which the pack is supported. A frameless backpack does not conform well to a user's body, especially the lower, or lumbar portion of the user's back. Additionally, the weight of a frameless backpack is carried either solely, or in large part, by the shoulders. It is preferable, however, for the weight of a pack to be carried by the hips or by the sacrum. A frameless backpack with shoulder straps cannot effectively transfer the weight of the pack to the sacrum. Although backpacks with internal or external frames are well known, such frames can be cumbersome and expensive. Additionally, backpacks with frames typically have a fixed, non-adjustable configuration.
It is an object of the present invention to provide a backpack that reduces or overcomes some or all of the difficulties inherent in prior known devices. Particular objects and advantages of the invention will be apparent to those skilled in the art, that is, those who are knowledgeable or experienced in this field of technology, in view of the following disclosure of the invention and detailed description of certain preferred embodiments.
In accordance with a first aspect, a backpack includes a backpack body having a body side. A pair of shoulder straps is connected at each end thereof to the backpack body. A semi-rigid support plate is positioned proximate the body side. A strap is connected to the support plate such that a lower portion of the support plate can be curved while an upper portion of the support plate remains substantially flat.
In accordance with another aspect, a backpack includes a backpack body having a body side. A pair of shoulder straps is connected at each end to the backpack body. A semi-rigid lumbar support plate is positioned in the backpack body proximate the body side. A strap is connected to the lumbar support plate such that a lower portion of the lumbar support plate can be curved to substantially follow a contour of a lumbar portion of an individual's spine while an upper portion of the lumbar support plate remains substantially flat.
In accordance with a further aspect, a backpack includes a backpack body having a body side. A pair of shoulder straps is connected at each end thereof to the backpack body. A semi-rigid support plate having a longitudinal axis is positioned proximate the body side of the back body, with a plurality of slots being formed in the support plate along the longitudinal axis. An adjustable fastener is secured to the support plate proximate an upper edge of the support plate. A strap is anchored at a first end thereof to a first end of the support plate, woven through the apertures such that a lower portion of the support plate can be curved while an upper portion of the support plate remains substantially flat, and adjustably connected to the fastener.
In accordance with yet another aspect, a backpack includes a backpack body having a body side. A pair of shoulder straps is connected at each end thereof to the backpack body. A semi-rigid support plate having a longitudinal axis is positioned proximate the body side of the back body, with a plurality of slots being formed in the support plate along the longitudinal axis. An adjustable fastener is secured to the support plate proximate an upper edge of the support plate. A strap is anchored at a first end thereof to a first end of the support plate, woven through the apertures, and adjustably connected to the fastener. The apertures are spaced along the support plate such that such that a lower portion of the support plate can be curved and the remaining portion of the support plate can remain substantially flat.
Substantial advantage is achieved by providing a backpack with a lumbar support plate. In particular, improved lumbar support can be realized with such a lumbar support plate provided within a backpack, allowing a portion of the weight of the backpack to be carried by the sacrum. Further, an adjustable lumbar support plate allows the backpack to be customized to fit different individuals, and to be customized to provide support and comfort for different activities. This is highly advantageous, since there are not only differences in the shape of the backs of different individuals, but also differences in the shape of the back of a particular individual depending on the activity in which they are engaged.
These and additional features and advantages of the invention disclosed here will be further understood from the following detailed disclosure of certain preferred embodiments.
The figures referred to above are not drawn necessarily to scale and should be understood to present a representation of the invention, illustrative of the principles involved. Some features of the backpack with a lumbar support plate depicted in the drawings have been enlarged or distorted relative to others to facilitate explanation and understanding. The same reference numbers are used in the drawings for similar or identical components and features shown in various alternative embodiments. Backpacks with lumbar support plates as disclosed herein, will have configurations and components determined, in part, by the intended application and environment in which they are used.
The present invention may be embodied in various forms. A preferred embodiment of a backpack 10 is shown in
When connected, these six panels or sides define an interior compartment in backpack 10 into which items such as books, food, clothing, etc. may be placed. The interior compartment of backpack 10 may be subdivided into compartments, and additional compartments may be added in order to keep various items separate from one another, thereby providing easy access to frequently used items, and allowing for the proper weight distribution and comfort to the wearer.
Although six particular sides or panels are described, backpack 10 can comprise fewer or more panels or sides, and be within the scope of the invention. For instance, each of the body, top, bottom, outer, and lateral sides can be comprised of one continuous piece of fabric with no actual seams or junctures. Alternatively, backpack 10 could even be formed with ten or more panels or sides and corresponding seams or junctures therebetween.
The panels making up backpack 10, as well as the straps and other components of the invention can variously comprise a number of natural or synthetic materials. Natural fabric such as leather, cotton (especially canvas or single-filled duck) and the like may be useful for certain applications. Exemplary materials are synthetic fabrics made from thermoplastic materials such as polypropylene, polyvinyl chloride, polyamide (such as nylon), polyethylene, polyester, etc. In certain preferred embodiments, nylon is used, which can be textured for breathability, wear-resistance, and waterproofed with materials such as silicone elastomers and the like. Particularly useful is a type of nylon known as Cordura (provided by E.I. du Pont de Nemours & Co., Wilmington, Del.). Multiple or composite layer configurations as are well-known in the art, in which a tougher, more durable weave comprises an outer layer while a lighter, thinner, and more flexible inner weave comprises an inner layer. Some of these materials known in the industry, such as Gore-Tex (provided by W. L. Gore & Associates, Newark, Del.), Tri-Shield (provided by Tri-Seal International, Blauvelt, N.Y.), Spandura (provided by H. Warsaw & Sons, New York, N.Y.), etc. can be used as appropriate.
A pair of shoulder straps 22 are secured at first and second ends thereof to backpack 10, with each shoulder strap including an adjustable buckle 21. A first or upper end 24 of each shoulder strap 22 is secured to an upper portion of body side 20. In certain preferred embodiments, a load lift strap 23 connects each shoulder strap 22 to top 12 of backpack 10. Load lift straps 23 are typically connected to shoulder strap 22 and top 12 by stitching or other suitable means, and include an adjustable buckle 25.
Thus, the length of load lift straps 23 can be adjusted to transfer the load in backpack 10 toward the user, in order to stabilize the backpack and to effectively distribute the weight of the backpack.
In a preferred embodiment, a pair of hip portions 26 extend outwardly from a lower portion of backpack 10 at the juncture between each lateral side 16 and body side 20. A second or lower end 28 of each shoulder strap 22 is secured to a corresponding hip portion 26 by stitching or other suitable means. A hip strap 25 is secured at opposite ends thereof to hip portions 26, with a buckle 27 or other suitable connector connecting first and second portions of hip strap 25.
A pad 30 may be secured to body side 20 of backpack 10 by stitching or other suitable means. For example, in certain embodiments, pad 30 could be placed within a sleeve formed in backpack 10. Pad 30 is formed of foam, such as molded ethyl vinyl acetate (EVA), or any other suitable material that provides cushioning for the back of the individual carrying backpack 10.
A semi-rigid support plate 32 is provided in backpack 10 adjacent body side 20. In the illustrated embodiment, with pad 30 secured to body side 20, support plate 32 is positioned between body side 20 and pad 30. As can be seen more clearly in a preferred embodiment shown in
As can be seen in
In other preferred embodiments, aperture 33b can be placed closer to lower edge 42 such that the curvature of lower portion 36 is more pronounced. In such embodiments, the lower portion of backpack 10 will stand off, or be spaced from the user's back, allowing ventilation, while at the same time providing support for the weight of the pack on the sacrum.
It is to be appreciated that apertures 33a–d may be in the form of slots as illustrated herein, or may take any other suitable form, including, for example, circular, rectangular, oval, or any other suitable shape that allows a strap to pass therethrough.
In the illustrated embodiment, a first end 40 of strap 34 is anchored to support plate 32 at lowermost aperture 33a proximate a lower edge 42 of support plate 32. As illustrated, strap 34 is folded over and sewn to itself at first end 40. The bulk of the folded over first end 40 is caught on the edge of aperture 33a, thereby anchoring first end 40. It is to be appreciated that first end 40 of strap 34 could be anchored or secured to lumbar support plate 32 proximate lower edge 42 by any of many other suitable means, including being directly secured to lumbar support plate 32 without the need for aperture 33a. For example, strap 34 could be riveted to support plate 32, secured by adhesive, or fastened in any other fashion. Suitable means of securing first end 40 of strap 34 to support plate 32 will become readily apparent to those skilled in the art, given the benefit of this disclosure.
Strap 34 extends from aperture 33a to the next adjacent aperture 33b on the outer side 44 of support plate 32. Strap 34 extends through aperture 33b, along body side 46 of support plate 32, through aperture 33c, along outer side 44, and back through aperture 33d. From aperture 33d, strap 34 extends along body side 46 and through an adjustable fastener 48.
Adjustable fastener 48 can take many forms. In the preferred embodiment illustrated in
It is to be appreciated that fastener 48 can have any of numerous configurations, including for example, D-ring fasteners, ratchets, cord-locks, or strap locks. Other suitable configurations for an adjustable fastener for strap 34 will become readily apparent to those skilled in the art, given the benefit of this disclosure.
The amount that lower portion 36 is curved can be altered simply by lengthening or shortening the length of strap 34 between lower edge 42 and aperture 33b, as illustrated in
Thus, strap 34 can easily be adjusted to vary the curvature of lower portion 36. This feature advantageously allows the backpack to be adjusted to fit a particular user's body shape. This feature also allows an adjustment of the curvature of lower portion 36 to match the activity of the user and/or increase the load bearing on the hips of the user. For example, when riding a bike, the user is bent forward toward the handlebars so that their lower back straightens, removing the natural lumbar curve. In such a situation, the user would loosen strap 34 such that lower portion 36, and, therefore, all of support plate 32, is substantially flat. On the other hand, when the user will be walking, strap 34 can be tightened to induce a curvature in lower portion 36. Further, when the user will be running, strap 34 can be tightened even further, such that there is a greater curvature to lower portion 36.
In another embodiment, as illustrated in
In certain preferred embodiments, as illustrated in
In another preferred embodiment, illustrated in
It is to be appreciated that the number of apertures disposed along upper portion 38 of support plate 32, which remains substantially flat, may vary. Factors that affect the number of apertures include the length of the board and the material of which strap 34 is formed.
Another preferred embodiment is illustrated in
In certain preferred embodiments, strap 34 may be formed of multiple components, rather than be formed of one continuous piece of material or webbing. For example, in one preferred embodiment shown in
In other preferred embodiments, strap 34 need not extend the entire height of lumbar support plate 32. In the embodiment illustrated in
Lumbar support plate 32 may be formed of any suitable semi-rigid material that provides some support and structure for backpack 10, yet remains flexible enough to be curved when strap 34 is shortened and return to a planar form when strap 34 is lengthened. Exemplary materials for support plate 32 include, but are not limited to, polyethylene, polypropylene, and polyvinylchloride. Other suitable materials will become readily apparent to those skilled in the art, given the benefit of this disclosure.
Strap 34 may be formed of webbing, cord, cable or any other material suitable of being secured at the lower end of support plate 32 and adjustably connected to the upper end of support plate 32, and that can be pulled to vary the amount that lower portion 36 is bent or curved. In one preferred embodiment, strap 34 is formed of nylon webbing.
In light of the foregoing disclosure of the invention and description of the preferred embodiments, those skilled in this area of technology will readily understand that various modifications and adaptations can be made without departing from the scope and spirit of the invention. All such modifications and adaptations are intended to be covered by the following claims.
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