The present disclosure relates generally to a releasable leash system and more specifically to a releasable leash system that mechanically couples a human being to a mobile sports device, such as a surfboard, snowboard, skateboard, wakeboard or bodyboard.
Numerous sports devices include a board element upon which a user stands and balances during use. It is often desirable to provide a leash coupling the user to the board element to increase the ease of management and retrieval of the board element. In the prior art a first end of the leash is typically attached to the trailing section of the board element. Board leashes may include a second end having a wrist or ankle strap for attachment to the user's body. The leash is preferably long enough to reduce the likelihood of injury to the user, e.g., a surfer, when the user becomes separated from the board element, while enabling the surfer to readily recover the board element for remounting.
A rail saver comprising a strip of fabric wider than the cord may optionally be provided to protect the board element from damaging contact with the cord. The rail saver may increase undesirable drag that degrades the mobility of the board element.
The prior art provides leashes that enable removal of the leash from the user as desired by the user, while securing the leash to the board by means of a cord knotted about a pin located within a plug assembly. The plug assembly (hereafter “plug”) may be fitted into a recessed area of the board, whereby the plug and its pin are located below a substantially planar deck surface of the board. The cord may be untied from the pin to facilitate storage of the sports device. Undesirably, the cord may also be detached from the other leash elements and misplaced between uses of the leash.
The prior art includes various attempts to improve leash systems, in particular for use with surfboards. U.S. Pat. No. 5,127,861 presents a combination leash attachment and lock for a surfboard. U.S. Pat. No. 5,199,916 discloses a releasable anchor plug with a retractable leash pin which secures a loop of a leash in a leash cavity. U.S. Pat. No. 6,390,872 discloses a surfboard having improved leash plug anchoring. U.S. Pat. App. Publication 2008/0160848 discloses a surfboard leash connection module using a hook and loop attachment fabric to secure a rail saver to an attachment pin. U.S. Pat. App. Publication 2012/0244763 presents a flexible restraint for use as a leash for a surfboard in which an elongated elastic main portion and an end portion are molded as a one piece structure. U.S. Pat. Nos. 5,127,861; 5,199,916; 6,390,872 and U.S. Patent Application Publications 2008/0160848 and 2012/0244763 are hereby incorporated by reference thereto in their entireties.
The present disclosure provides an improved leash mount for use with a mobile sporting device such as for example a surfboard. The new leash mount and releasable leash system can be manufactured at lower cost, comprises fewer components, is more reliable, quicker to operate and lighter than known leash systems. By providing a predetermined directionality of the leash the disclosed system significantly reduces the risk of a surfer becoming entangled by the leash.
These advantages are achieved by a leash mount which comprises a bottom wall, a side wall with an inner side wall section and an outer side wall section, and an upper wall. A leash cavity is formed between the bottom wall, the side wall, and the upper wall. The leash cavity is accessible through two openings in the leash mount: A leash opening is provided and arranged in the outer side wall section. A deck opening is arranged in the upper wall. A retainer member extends upwardly from the bottom wall towards the deck opening. The retainer member has an upper surface sloped outwardly towards the leash opening and a substantially vertical inner surface opposite the leash opening.
The leash cavity within the leash mount is shaped to accept a looped end of a leash which is inserted into the leash mount through the leash opening such that the looped end of the leash wraps around the retainer member.
The leash cavity may further comprise a nipple recess within the inner side wall section opposite the leash opening. The nipple recess provides space for a nipple which extends forward from the looped end of a leash. When engaged, the nipple may be the only part of the leash that extends through the leash opening of the leash mount. The nipple is used to disengage the leash from the leash mount, allowing a user to easily pull the looped end of the leash rearwardly over the retaining member.
To securely attach the leash mount to a mobile sporting device a width (w4) of the outer side wall is preferably shorter than a maximum width (w2) of the leash mount.
The leash mount may be made of molded polymer. In particular, the leash mount may be formed as a molded piece of polyamide plastic.
The leash mount may be securely attached to a trailing section of a board element of a mobile sports device, e.g. a surfboard. In that case the upper wall is substantially level with a deck surface of the board element, and the outer side wall section is exposed at a rear end of the board element. The board element may comprise laminated fiberglass, and the leash mount may be attached during assembly of the board element before the board element is laminated. In that case a disposable seal member or a plurality of disposable seal members may be used to seal the leash cavity during assembly of the leash mount to the board element.
The leash plug and a corresponding leash form a releasable leash system. The corresponding leash has a looped first end and an opposite second end. The leash is inserted into the leash mount through the leash opening and the looped first end wraps around the retainer member. In the engaged state the looped first end of the leash transfers any longitudinal force from the leash into the substantially vertical inner surface of the retaining member.
The leash mount and the leash may be made of a same material. More specifically, the leash may be made of an elastic material which assumes a predetermined shape when not deflected by external force. By using an elastic material the leash may be provided predetermined directionality by appropriately positioning the leash opening of the leash mount.
The leash may comprise a first leash section and a second leash section which are connected to each other by a swivel. The swivel may be disposed substantially centrally within the leash between the looped first end and the second end of the leash. More preferably, the first leash section and the second leash section may be sized unevenly. More specifically, the length of the first leash section may be between 5% and 30% of the total length of the leash. To total length of the leash is the sum of the length of the first leash section and the length of the second leash section.
The first and second leash sections may be made of material having different elasticity and hardness. The first and the second leash section may be injection molded pieces, and the swivel between them may be overmolded into the first leash section and/or the second leash section. The first leash section and the section leash section may be simultaneously molded in one process step. The leash may be made of polyurethane. The looped first end of the leash may be an integral injection molded part of the leash.
The second end of the leash may be connected to an ankle cuff. To further improve the directional guidance of the leash the ankle cuff may comprise an adhesive inner surface which prevents rotation of the ankle cuff against the skin of a user. The adhesive inner surface may be silicone. The ankle cuff may be sewed to an attachment plate, which is an integral molded part of the second end of the leash.
The looped first end of the leash may further comprise a nipple which extends upwardly through the deck opening when the leash is connected to the leash mount.
A protective device for a surfboard may be inserted into the leash mount to protect a trailing section of the surfboard which is stored upright. The protective device provides an elastic stand having a first end shaped to securely engage the leash mount and a second end extending outwardly from the leash mount beyond the trailing section of the surfboard.
The releasable leash system may comprise a leash mount having a leash opening through which an end of a leash is inserted. The leash mount comprises a leash cavity and a retainer member disposed within the leash cavity. The retainer member may be arranged substantially perpendicular to a longitudinal axis of the leash. The end of the leash comprises a retainer recess which engages the retainer member when the leash is fully inserted into the leash mount. The leash may be made of elastic material, and the leash opening may be smaller than the end of the leash such that the end of the leash is elastically deformed while being inserted through the leash opening. The shape of the end of the leash corresponds to a shape of the leash cavity.
The disclosed leash mount may further comprise a deck opening. The end of the leash may protrude through the deck opening while the end of the leash slides over the retaining member when the leash is inserted through the leash opening into the leash cavity. The end of the leash may be arranged substantially level with or below the deck opening when it is fully inserted into the leash mount and the retaining member engages the retainer recess. The retainer recess may be an eye of a loop.
The leash mount may be mounted within a trailing section of a board element of a mobile sports device. In this arrangement the end of the leash may be directed rearward away from the sporting device when inserted into the leash mount. This prevents the leash from being washed onto the board and become an entanglement hazard for the surfer.
The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.
a is a more detailed view of a leash mount and a corresponding end of a leash.
b is the same as
a through
a is a perspective view of an attachment plate to which an ankle cuff can be attached.
b is a side view of the attachment plate show in
a shows a leash mount where the deck opening and the leash opening are both accessible from the deck of a mobile sporting device.
b shows a leash mount using a stainless steel pin to separate the deck opening and the leash opening of the mount.
c shows a leash mount with ribs in its inner side wall section.
d shows a leash mount with an extended side wall.
a shows a looped end of a leash with a nipple.
b shows a looped end of a leash with a release tab.
Referring to
A more detailed view of the leash mount 200 and the first end 101 of the leash 100 is provided in
An upper wall 218 is provided opposite the bottom wall 210. The bottom wall 210, the side wall 220 and the upper wall 218 form the outer surfaces of the leash mount 200. Between these walls and within the leash plug a leash cavity 217 is formed. The leash cavity 217 is accessible from outside through a leash opening 219 which is provided within the outer sidewall section 222. The leash cavity 217 is also accessible through a deck opening 240 within the upper wall 218. As shown in
Disposed within the leash cavity 217 is a retaining member 230. The retainer member 230 extends upwardly from the bottom wall 210 towards the deck opening 240. The retaining member has an upper surface 232 which is sloped outwardly towards the leash opening 219. A substantially vertical inner surface 231 faces inwardly opposite the leash opening 219. The substantially vertical inner surface 231 is arranged substantially perpendicular to an entry channel for a leash formed by the leash opening 219.
The leash cavity 217 may further comprise a nipple recess 216 within the inner side wall section 221. The nipple provides space for a corresponding nipple 114 of the leash 100 when the leash 100 engages the leash mount 200.
Advantageous proportions of the releasable leash system 1 are further described with reference to
To firmly attach the leash mount 200 within a corresponding cavity of a mobile sporting device the maximum width w2 of the leash mount 200 is wider than the width w4 of the outwardly accessible outer side wall section 222. In effect, any force pulling the leash mount 200 towards the leash opening 219 can be absorbed by the widening inner side wall section 221. The leash mount 200 may comprise slots or ribs in its inner side wall section 221 or in its bottom wall 210 to further strengthen the bond between the leash mount 200 and the mobile sporting device to which it is attached. Exemplary ribs 255 in the inner side wall section 221 are shown in
The width w1 of the leash cavity 217 corresponds to the width w5 of the looped leash end 101 and is wider than the width w3 of the leash opening 219. In effect, the leash end 101 is elastically deformed by pushing together the looped end 101 when inserting it through the relatively narrower leash opening 219.
Operation of the releasable leash system is illustrated more detailed in
At some point, as illustrated in
Continued inward movement of the leash 100 along insertion direction (I) allows the looped end 101 to reach the tip 233 of the retaining member 230 as illustrated in
Finally, as shown in
The simple plug-operating allows very quick attachment of the leash 100 to the leash mount 200, resulting in an approximately 90% time saving over traditional leash attachment systems. This time saving is important for competitive surfers who often switch their board. For recreational surfers the new attachment system 1 increases convenience, especially when switching boards in water, where the relative ease of attachment will be appreciated.
To release the leash 100 from the leash mount 200, a user may pull upwardly and backwardly on the nipple 114 of the leash 100 until the looped end 101 of the leash 100 reaches the tip 233 of the retaining member 230. After that, the leash 100 may be pulled out of the leash mount 200 opposite the direction insertion (I).
While the nipple 114 may be molded as an integral part of the looped end 101 it may also be formed as a string or a band which is attached to or molded into the looped end 101. Nipple 114 may also be eliminated, however in that case a tool may be needed to grab and pull backward the looped end 101 when it is located in the leash cavity 217.
Referring now to
Previously, leash systems used to require two swivels, one swivel being disposed close to the first end of the leash, and a second swivel being disposed close to the second end of the leash. In contrast, the disclosed leash system requires only one swivel 130, which is located more centrally between the first end 101 and the second end 102 of the leash 100. In particular, the length 11 of the first leash section between the first end 101 of the leash 100 and the swivel 130 is beneficially between 5% and 30% of the total length l1+l2 of the leash 100. In practice, one may manufacture the first leash section 110 at a fixed length, and manufacture the second leash section 111 with different lengths to achieve a desired total leash length of e.g. 5 to 10 feet. A first leash section 110 may for example be 0.5 foot long, and a second leash section 111 may be 9.5 feet long, i.e. the length l1 of first leash section 110 is 5% of the total length l1+l2 of the leash 100. In a different example a first leash section 110 may for example be 1 foot long, and a second leash section 111 may be 4 feet long, i.e. the length l1 of first leash section 110 is 20% of the total length l1+l2 of the leash 100. The placement of the swivel 130 leads to the swivel 130 being subjected exclusively to longitudinal force and rotational force through the leash 100 without a lateral or bending component, thus allowing the swivel 130 to operate optimally. Unnecessary loops or noses that prior leash systems are prone to develop during use are effectively prevented with the disclosed arrangement.
The first leash section 110 and the second leash section 111 may be made of the same material, for example be made of thermoplastic polyurethane (TPU). Different types of thermoplastic polyurethane having different hardness are available. The first leash section 110 and the second leash section 111 may be made of material having different elasticity and hardness. Advantageously, the first leash section 110 may be harder than the second leash section 111. For example, a regular leash with a diameter of 6 mm may comprise a first leash section 110 and its looped first end 101 with a hardness of about 95 Shore A while the second leash section 111 may be softer with a hardness between 82 and 92 Shore A. A competition leash with a diameter of 5 mm may have a first leash section 110 having a hardness of about 95 Shore A while the second leash section 111 may be softer with a hardness of 90±2 Shore A. For optimal performance the looped end 101 should have a hardness of more than 92 Shore A. The diameter of the leash 100 is chosen depending on the specific intended use (large waves or small waves).
The swivel 130 may be overmolded into the first leash section 110 and/or the second leash section 111. Swivel 130 may include an internal ball bearing and is preferably made of stainless steel. The first leash section 110 and the second leash section 111 may be simultaneously molded in one process step. Similarly, the looped first end 101 of the leash 100 may be an integral injection molded part of the leash 100.
As shown in
In a further improvement, an adhesive material, for example silicon, may be applied to the inner surface 121 of the ankle cuff 120. The adhesive material prevents the ankle cuff 120 from rotating around the ankle of the surfer even under traction, so that the leash 100 is directed rearward away from the surfer's leg. The ankle cuff 120 may be made of Alcantara® or a similarly soft material to provide user comfort.
The disclosed design provides a significant cost advantage by reducing the total number of parts that make leash 100, and by allowing the remaining parts to be manufactured very efficiently. In a first manufacturing step the leash 100 can be molded with its looped end 101 on one end and attachment plate 126 on the opposite end. In a second manufacturing step the ankle cuff 120 is sewed to the attachment plate, completing the leash 100 in only two steps. Previously, two swivels were typically attached to the leash, one being screwed or riveted to a rail saver, the other being screwed or riveted to the ankle cuff. Having overmolded one swivel 130 directly into the leash 100 eliminates the need for manual attachment of a swivel and increases robustness of the system overall. Even though the disclosed leash 100 is more robust, it also is about 20% lighter than a traditional leash.
The directional guidance of both ends of the leash 100 when in use addresses a significant drawback of existing leash systems: Previously, ankle cuffs had a tendency to slip around a surfer's ankle when under lateral tension. As a result of such a rotation at the ankle, a leash could run between the surfer's legs, and thus have a disruptive effect on further surfing. Also, known leash plugs provided no directional guidance for the leash, allowing waves to push the leash, or a string attached to the leash, onto the board which caused entanglement and subsequent falling. The here presented releasable leash system 1 guides the leash 100 rearward away from the surfer both at the ankle cuff 120 and at the leash mount 200 and effectively solves the problem of a surfer becoming entangled with the leash. This is particularly important during the critical take off phase when a surfer catches a wave and rises from a lying position to standing on the board.
Also, previously known leash plugs were mounted onto a surfboard such, that the leash would be attached from the deck side of the surfboard, requiring strings and rail savers to attach a leash and to protect the board from being damaged. Those are no longer necessary, as the leash opening 219 of the here presented leash mount 200 is positioned within a surfboard such, that the leash 100 exists rearward without contacting the deck of the surfboard. In prior systems the string, the rail saver, and the leash were typically made from materials having different elasticity. This caused additional weak spots and increased likelihood of failure. The present system avoids these weak spots and, by virtue of reducing the overall part count, increases the robustness of the system as there are fewer components that can fail.
The leash mount 200 may be made of a polymer and may in particular be formed as an injection molded piece of polyamide with a fiberglass content of approximately 30%, e.g. with a fiberglass content between 20% and 40%.
The leash mount 200 may be securely attached to a trailing section of a board element of a mobile sports device, such that the upper wall 218 is substantially flush with a deck surface of the board element. The outer side wall section 222 may be exposed at a rear end of the board element. In particular, the leash mount 200 may be mounted into a correspondingly shaped cavity of a surfboard.
In an exemplary installation method the leash mount 200 may be installed during the original assembly of a surfboard which comprises laminated fiberglass. The leash mount 200 is attached during assembly of the surfboard, and the surfboard deck is laminated after the leash mount 200 has been attached. To prevent contamination of the leash cavity 217 during assembly a first disposable seal member 34 as shown in
The leash mount 200 need not necessarily be a separate component but may be formed as an integral part of a mobile sporting device such as a surfboard. It may for example be produced by using a silicon core 35 as shown in
The releasable leash system 1 may be used in a variety of different ways. Ideally, the disclosed leash 100 and corresponding leash mount 200 are used together, and the leash mount 200 is mounted to a mobile sporting device as part of the original sporting device manufacturing process. Alternatively, the leash mount 200 may be assembled to a mobile sporting device in a retrofit assembly operation. Some users may, however, wish to combine a novel leash 100 with a traditional leash plug 91 when using an older sporting device. This can be accomplished by providing a leash adapter 40 as shown in
Similarly, a user may wish to use an older conventional leash with the novel leash mount 200. This can be accomplished by providing a leash mount adapter 28 as shown in
As shown in
a-13d illustrate alternative embodiments of leash mounts. The alternative embodiment of a leash mount 251 shown in
b shows another embodiment of a leash mount 252. Here, the leash mount also uses a stainless steel pin 250 to secure a looped end of a leash within a leash cavity. In contrast to the embodiment shown in
c shows yet another embodiment of a leash mount 254. Here, ribs 255 are provided on the inner side wall section to strengthen the bond between the leash mount 254 and the sporting device into which is may be mounted. Also, the illustrated embodiment does not utilize a nipple recess.
Yet another embodiment of the leash mount 253 is shown in
Referring to the various embodiments of a leash mount 251, 252, 253, 254 shown in
a and
Yet another embodiment of a swivel 182 is shown in
As shown in
While the leash mount as disclosed provides an excellent way of attaching a leash to a mobile sporting device, it may be used to attach other elements or devices to a mobile sporting device. Possible locations of a leash mount on a surfboard are shown in
While the present invention has been described with reference to exemplary embodiments, it will be readily apparent to those skilled in the art that the invention is not limited to the disclosed or illustrated embodiments but, on the contrary, is intended to cover numerous other modifications, substitutions, variations and broad equivalent arrangements that are included within the spirit and scope of the following claims.
This application claims priority to provisional application 61/814,749 filed on Apr. 22, 2013, which is incorporated by reference herein in its entirety.
Number | Date | Country | |
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61814749 | Apr 2013 | US |