Boats for use in navigating whitewater, e.g., whitewater kayaks, canoes and rafts, are typically outfitted with some type of knee brace, to allow the paddler to use his or her leg strength and body weight to help maneuver the boat.
In some cases, for example in open cockpit kayaks, the brace may take the form of a thigh strap, for example as disclosed in U.S. Pat. No. 5,493,982. Thigh straps provide some control of the craft, but control can be limited because force is applied predominately by the user's thigh and shin.
Hard shell boats, e.g., molded plastic and fiberglass whitewater kayaks, often have rigid, molded “hard shell” knee braces, which in some cases are lined with foam for comfort and to provide some conformability to the user's leg shape. Knee braces of this type generally provide good control of the boat, but may lack adjustability and generally cannot be used with inflatable boats. In particular, such braces are not suitable for use with lightweight inflatable boats, such as packrafts designed for backcountry use.
The present disclosure relates generally to knee braces for boats. The knee braces described herein are particularly suitable for use with lightweight, inflatable rafts and kayaks, for example packrafts used in backcountry boating. The knee braces may be used, for example, in whitewater boating, as well as other applications such as sea-kayaking or expedition use.
In one aspect, the disclosure features a knee brace for a boat, the knee brace comprising: (a) a fabric body, (b) four attachment points, each attachment point comprising a strap having a fixed end attached to the fabric body, a standing portion configured to be attached to a side wall of the watercraft, and a free end, and (c) an adjustment buckle disposed on each of the straps and configured to allow adjustment of the length of the free end of the strap.
Some implementations may include one or more of the following features. The straps may be configured to allow the user to apply a pulling force along the midline of the user's knee during use of the boat. The straps may be configured to allow the user to pull the free ends of the straps toward his or her torso when tightening the straps. In some cases, the adjustment buckles are configured to allow one-handed loosening of the straps. In some implementations, the knee brace is configured so that once the position of the knee brace on the side wall is configured for a user the user does not need to adjust the straps when entering and exiting the boat.
The knee brace may further include one or more fasteners configured to releasably attach the standing portions of one or more of the straps to the side wall. At least one of the fasteners may include a portion of a quick release buckle.
The straps may be formed of webbing. The fabric body may include a stretch material, configured to be positioned over the user's kneecap during use. In some implementations, the fabric body also includes a substantially non-elastic material disposed along an inner edge of the fabric body to provide stiffness to the fabric body. The fabric body may also include a pre-tensioned ribbon tape along an inner edge of the fabric body.
In another aspect, the disclosure features an inflatable boat comprising: (a) a boat body having a side wall, and (b) a knee brace comprising (i) a fabric body, and (ii) four attachment points securing the knee brace to the side wall, each attachment point comprising a strap having a fixed end attached to the fabric body, a standing portion configured to be attached to the side wall, and a free end.
Some implementations of this aspect of the disclosure may include any of the features discussed above. Implementations may also include one or more of the following features.
The side wall may include attachment locations to which the attachment points are secured. For example, the side wall may include an array of attachment loops to which one of the attachment points can be secured, allowing the user to choose one of the loops to adjust the fit of the knee brace. In some cases, two of the attachment locations are configured to receive ends of a rod from which two of the straps can be suspended when the knee brace is mounted on the boat.
In yet another aspect, the disclosure features a method of releasably attaching a fabric knee brace to an inflatable boat. The method includes securing the knee brace to the side wall using four releasable attachment points, each attachment point comprising a strap having a fixed end attached to the fabric body, a standing portion configured to be attached to the side wall, and a free end.
In some implementations, securing comprises releasably attaching a rod to the side wall by positioning ends of the rod in receiving pockets on the side wall, and suspending two of the straps from the rod. Securing may also include releasably attaching a clip on one of the straps to one of an array of attachment loops on the side wall, and/or securing one of the straps to the side wall using a quick release buckle.
The knee braces described herein provide control and steering similar to what is provided by a rigid knee brace, while still being packable with an inflatable boat. The knee braces are highly adjustable, providing good leg support and enhancing user comfort. The design of preferred knee braces allows the user to pull along the midpoint of the knee, maximizing the torque that can be applied to the boat and providing excellent control of the tip of the boat in waves. These features may allow a user to use the knee braces to Eskimo roll the boat, even in the case of a flat-bottomed raft, a craft that is notoriously difficult to Eskimo roll. In preferred implementations, the knee brace defines an enclosed cup that minimizes risk of entanglement in the event of the boat capsizing or deflating.
Each knee brace 12 includes a fabric body 14 and a plurality of adjustment and attachment straps, which will be described in detail below. Importantly, the straps provide four points of adjustable attachment of the knee brace around the user's knee. This arrangement has been found to provide the best balance of control of the boat with ease of use, user comfort and safety.
As shown in
The non-elastic portion 22 provides a strong, stiff area for attachment of the adjustment straps, and gives the user a stiff strap with which to apply force to the raft. The non-elastic portion may be formed, for example, of heavy pack cloth or other stiff, tightly woven material. Preferably, the non-elastic portion 22 is configured so that the grain of the fabric is substantially perpendicular to the length of the user's leg, and the edge 29 is curved in a manner so that tensile forces applied to the brace during use are applied along the grain of the fabric rather than on the diagonal.
For optimal stiffness of the non-elastic portion 22, it is preferred that the edge 29 be reinforced with a ribbon tape 33. This also provides reinforcement to the attachment points of straps 32 and 34, discussed below, as these straps can be stitched to the fabric body under or with the ribbon tape as well as with additional stitching inboard of the tape. The ribbon tape may be formed, for example, from nylon webbing, and is preferably held under tension as it is being applied to the edge. This pre-tensioned ribbon tape provides the non-elastic portion 22 with a hard edge that exhibits substantially no stretch under normal use conditions.
The elastic portion 20 and/or the non-elastic portion 22 may include sewn darts or the like to provide more fullness in the fabric portion in the area where the user's kneecap will be positioned.
In the implementation shown in
As shown in
Strap 32 is preferably attached to edge 29 by first stitching the strap edge in line with the edge 29, for secure attachment, and then applying another, inboard, line of stitching at an angle, as shown in
Central strap 28 is threaded through a retainer loop 31 (a short length of webbing secured at both ends to the fabric body) and then through a buckle 30 in a manner such that the tail of the central strap is positioned to be pulled toward the user. The other straps can also be adjusted without the user having to pull away from his or her torso. This arrangement facilitates adjustment of the strap from a seated position in the raft, which is particularly advantageous for “on the fly” adjustments when the raft is on the water.
As shown in
A preferred sequence of adjusting the straps will now be discussed, with reference to
Referring to
Referring now to
The user then adjusts central strap 28 through central buckle 30, as shown in
Finally, as shown in
The straps may become loose during use, particularly as the webbing gets wet. The system described above allows the user to easily re-adjust the fit of the knee brace as any loosening occurs. The buckles 26, 30, 36 and 38 are also configured to allow the user to easily loosen or release the straps with one hand, e.g., by lifting up on the curved end of the buckle with the user's thumb.
A preferred sequence of steps for attaching the knee brace to the raft will now be discussed, with reference to
The installation process begins with the knee brace receiving portion of the raft in the position shown in
Referring now to
Referring now to
Next, the forward attachment point 19 is established by attaching a hook-type fastener 52 through one of the attachment loops 44. The attachment loop to be used is selected by the user to provide a comfortable fit on the user's leg. The strap is flipped over during attachment, as indicated by the arrows, such that the hook is inserted in a direction away from the user's torso. Flipping the strap over in this manner causes the strap 24 to extend across the user's knee with a flatter profile, enhancing user comfort.
Finally, as shown in
A knee brace 102, according to a second, simplified embodiment, is shown in
Referring to
The upper edge 116 and lower edge 120 of the body are reinforced with webbing 122a, 122b. Webbing 122a extends from either side of the body to form a forward upper strap 124a and a rearward upper strap 124b, while webbing 122b extends to form a forward lower strap 126 and a rearward lower strap 128.
Referring now to
The upper attachment point 104 includes a series of attachment slots 130, provided in an elongated strap plate 132 that is glued or welded to the side wall of the raft. The attachment slots 130 allow the buckles 134a, 134b (
The forward attachment point includes a single webbing loop 136 attached to a forward strap plate 138 that is glued or welded to the sidewall. The loop 136 is easy for the user to reach and allows the buckle 140 of forward lower strap 126 to be readily fastened.
The rearward attachment point includes a female buckle portion 142 of a quick release buckle, mounted on a rearward strap plate 144. Buckle portion 142 is configured to engage male buckle portion 146 (
The initial attachment of the knee brace to the raft is illustrated in
Referring to
Next, the user pulls the fabric body over her leg, towards the upper attachment point 104, and attaches the buckle 134a of the forward upper strap 124a through a desired pair of attachment slots 130 (
Lastly, the user inserts male buckle portion 146 into female buckle portion 142 to attach the rearward lower strap 128 to the raft and thus establish the rearward attachment point, completing the four-point attachment of the knee brace. The user can then make any final adjustments to the fit by adjusting the lengths of the tails of the four straps.
Advantageously, in this embodiment once the user has attached the knee brace to the raft the user can get in and out of the raft simply by positioning the knee brace over her knee (
A number of embodiments have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the disclosure.
For example, the knee brace can be attached to the packraft either removably or permanently using other techniques than those shown in
Moreover, in both of the embodiments described above the removable attachment arrangement described above may be modified, for example by providing fewer attachment loops 44 or by utilizing different types of buckles.
If desired, the protective flap 25 underlying the shin strap in the knee brace 12 may be omitted.
In some implementations each of the strap plates 132 shown in
It should also be understood that the sequences described above for applying the knee brace to the knee and attaching the knee brace to the boat are given by way of example. The steps can be performed in any desired order, and in the case of re-adjustment, may be performed individually rather than as a sequence.
Accordingly, other embodiments are within the scope of the following claims.
This application is a continuation application of U.S. patent application Ser. No. 15/809,479, filed Nov. 10, 2017, which is a continuation application of International Patent Application No. PCT/US2016/47743, filed Aug. 19, 2016, which claims priority to U.S. patent application Ser. No. 14/832,546, filed Aug. 21, 2015, now U.S. Pat. No. 9,616,976, issued on Apr. 11, 2017, the entire contents of which is hereby incorporated by reference.
Number | Date | Country | |
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Parent | 15809479 | Nov 2017 | US |
Child | 16189086 | US | |
Parent | PCT/US2016/047743 | Aug 2016 | US |
Child | 15809479 | US |
Number | Date | Country | |
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Parent | 14832546 | Aug 2015 | US |
Child | PCT/US2016/047743 | US |