Patent Grant
9516923
The present invention is related to coupling devices for various articles, such as braces, medical devices, shoes, clothing, apparel, and the like. Such articles often include coupling devices, such as buckles, straps, and the like, that allow the article to be placed and roughly fit about a limb. Conventional buckles and/or other closure devices, however, often are limited in there usefulness. For example, Velcro® straps and/or components are often employed in coupling devices. A common example invovles straps that may include Velcro® surfaces that allow the straps to be tensioned and folded back and coupled on itself. Such Velcro® surfaces, however, often get filled or cluttered with dirt and/or debris, which limits the usefulness and/or life of such straps. Additionally, various buckles that are used in coupling devices often allow a user to uncouple or release the buckle with the article is fully tensioned. The uncoupling of the buckle may be purposeful or accidental, such as when the buckle contacts nearby objects. Releasing the tensioned article may cause the limb to be unsupported, which may subject the limb to damage, and/or may cause the user to trip, fall, or otherwise lose concentration during an activity. Due to the limitation of conventional buckles and closure devices, improved closure devices are desired.
The present invention generally provides improved closure devices that may be used for closure various articles, such as braces, medical devices, shoes, clothing, apparel, and the like. According to one aspect, a coupling device for coupling opposing portions of an article is provided. The coupling device includes a female component having a main body portion and a coupling aperture that includes a recessed portion. The coupling device also includes a male component having a main body portion and a coupling member. The main body portion of the male component has a proximal end and a distal end. The coupling member of the male component is positioned on the distal end of the main body.
The coupling member includes a tab that extends from the main body portion and a flange that extends from the tab. The tab and/or flange are insertable within the coupling aperture of the female component to couple the male and female components together. The male and female components are coupled via engagement of a surface of the tab and a lip of the coupling aperture. When the male and female components are coupled together, the flange is positionable within the recessed portion of the female component to maintain a coupled engagement of the male and female components.
The closure device further includes a tension member component that is configured to couple a tension member with the proximal end of the male component. The tension member is configured to tension the male and female components. The male and female components are not releasable from the coupled engagement while under tension via the tension member. The coupled male and female components have a cross sectional area and the coupled components exhibit a failure strength of between about 560 and 840 Newtons per square centimeter of cross sectional area.
In some embodiments, the tension member is a strap and the proximal end of the main body includes a D-ring around which the strap is positioned. In other embodiments, the tension member is a lace and the proximal end of the main body includes a channel throughwhich the lace is inserted or otherwise disposed. In such embodiments, a proximal end of the lace is coupled with a reel assembly. The lace is tensionable by operation of the reel assembly to tension the male and female components. In some embodiments, the tension member is a lace and a reel assembly is coupled with a top surface of the male component. In such embodiments, the lace is coupled with the reel assembly and is tensionable thereby.
In some embodiments, the article is a brace and the female component is coupled with one side of the brace while the male component is coupled with an opposing side of the brace. Such a configuration allows the brace to be opened and closed about a limb of a patient by coupling and uncoupling the male and female components. The female and/or male component may be coupled with the brace via one or more of the following attachment methods: stitching a flange of the main body to the brace, inserting a rivet through an aperture of the main body and into the brace, injection molding the female component into the brace, adhesive bonding the main body to the brace, RF welding the main body to the brace, heat welding the main body to the brace, and the like. When coupled together, the male and female components have a low profile about a surface of the brace so as to minimize contact between the male and female components and surrounding objects. In some embodiments, the male and female components are lockable in the coupled engagement to prevent uncoupling of the male and female components.
In some embodiments, the female component has an arcuate configuration that corresponds to a shape of the article (e.g., brace). In such embodiments, the male component may have a generally planar configuration. Tensioning of the male and female components via the tension member may cause the male component to rotate into an increased engagement with the female component. In some embodiments, the coupling component includes an audible feedback mechanism that provides audible feedback to a user that indicates coupling or uncoupling of the male and female components. The audible feedback mechanism may include a post that is coupled with the main body of the female component and a flange member that is coupled with the main body of the male component. The flange member may snap into engagement with the post to produce the audible feedback as the male and female components are coupled together. In some embodiments, the proximal end of the main body of the male component may include an arcuate recess that allows the male component to be gripped by a user during coupling or uncoupling of the male and female components.
According to another aspect, a coupling device is provided. The coupling device includes a female component that includes a main body portion having a top surface and a bottom surface and a coupling aperture. The coupling device also includes a male component that includes a main body portion having a top surface and a bottom surface and a coupling member. The coupling member also includes a top surface and a bottom surface. The top surface of the coupling member is offset from the bottom surface of the main body portion and the coupling member is insertable within the coupling aperture of the female component to couple the male and female components together. The male and female components are tensionable via a tension member and are non-releasable from a coupled engagement while under tension. When the male and female components are coupled together, the top surface of the male component is aligned with the top surface of the female component and the bottom surface of the coupling member and/or male component is aligned with the bottom surface of the female component. The coupled male and female components have a cross sectional area and the coupled components exhibit a failure strength of between about 560 and 840 Newtons per square centimeter of cross sectional area.
The male and female components are coupled together by engagement of a surface of the coupling member with a lip of the coupling aperture. In some embodiments, a proximal end of the male component is coupled with the tension member. In some embodiments, the tension member is lace and the proximal end of the main body includes a channel throughwhich the lace is inserted, or the proximal end of the main body includes a reel assembly that couples with the lace and is operable to tension the lace.
In some embodiments, the coupling device is attached to a brace to allow the brace to be opened and closed about a limb of a patient by coupling and uncoupling the male and female components. In such embodiments, the female component is coupled with a side of an opening of the brace and the male component is coupled with an opposing side of the opening of the brace. In some embodiments, the main body of the female component includes a post and the main body of the male component includes a flange member. The flange member is configured to snap into engagement with the post as the male and female components are coupled together to produce audible feedback.
According to another aspect, another coupling device is provided. The coupling device includes a female component having a main body portion and a coupling aperture. The coupling device also includes a male component having a main body portion that includes a top surface and a relatively planar bottom surface and a coupling member that is mateable with the coupling aperture of the female component to couple the male and female components together. The coupling member includes a relatively planar top surface and a bottom surface. The relatively planar top surface of the coupling member is offset from the relatively planar bottom surface.
The male and female components are not releasable from a coupled engagement while under tension via a tension member. The coupled male and female components have a cross sectional area and exhibit a failure strength of between about 560 and 840 Newtons per square centimeter of cross sectional area. In some embodiments, the coupling aperture includes a recessed portion having a bottom surface. In such embodiments, the relatively planar top surface of the coupling member may be positioned adjacent the bottom surface of the recessed portion when the male and female components are coupled together.
According to another aspect, a method for coupling male and female coupling components is provided. The method includes mating a coupling member of a male component with a coupling aperture of a female component to couple the male and female components together. The coupling member extends from a main body of the male component and the coupling aperture is disposed within a main body of the female component. Mating of the coupling member with the coupling aperture includes: a translation movement of the male component relative to the female component and a rotational movement of the male component relative to the female component.
In some embodiments, mating of the coupling member with the coupling aperture may be performed with a single hand. In some embodiments, the male and female components may be coupled with an article and a proximal end of the male component may be coupled with a tension member that is configured to tension the male and female components upon operation of a reel assembly. In such embodiments, the method may further include tensioning the tension member via the reel assembly to tension the male and female components and thereby tighten the article about a limb of an individual. In such embodiments, the method may additionally include: releasing tension in the tension member via the reel assembly and uncoupling the male component from the female component to allow the article to be removed from the limb. The male component may not be uncouplable or releasable from the female component while some amount of tension remains in the tension member.
In some embodiments, the method may additionally include: positioning the article about the limb, folding a first side of the article over the limb with the male component being coupled with the first side of the article, and coupling the male component with the female component to close the article about the limb with the female component being coupled with a second side of the article. The method may additionally include locking the male and female components in the coupled engagement to prevent uncoupling of the male and female components. In some embodiments, the article may be a brace.
In some embodiments, the translation movement may include inserting a flange portion of the coupling member within the coupling aperture and the rotational movement may include rotating the male component so that a top surface of the flange portion is positioned adjacent a bottom surface of the female component. In such embodiments, the translational movement may include a movement in a first direction without a significant movement in an opposite direction. In some embodiments, the translation movement may be along an axis of a plane that bisects the male and female components and the rotational movement may be about an axis that is orthogonal to the plane bisecting the male and female components.
The present invention is described in conjunction with the appended figures:
In the appended figures, similar components and/or features may have the same numerical reference label. Further, various components of the same type may be distinguished by following the reference label by a letter that distinguishes among the similar components and/or features. If only the first numerical reference label is used in the specification, the description is applicable to any one of the similar components and/or features having the same first numerical reference label irrespective of the letter suffix.
Embodiments described herein provide various closure devices or mechanisms (hereinafter detachable guides) that may be used to close various articles, such as braces, footwear, hats, gloves, or other apparel to allow a user to don and doff the article. For convenience in describing the embodiments, the detachable guides will be described generally as being coupled with braces to allow the braces to be quickly donned/doffed and/or tightened about a user's limb. Although the disclosure will focus mainly on braces, it should be realized that the detachable guides may be used for or with various other articles.
In some embodiments, the detachable guides may be used with lacing systems that include reel assemblies that close and tighten the brace about the user's limb. The detachable guides provide various improvements over conventional closure systems including: having a low profile when male and female components are coupled together; being intuitive and easy to use, being able to be closed without requiring the user to look at the components, being intentionally un-releasable while under load, providing audible and visual engagement, preventing accidental release (e.g., especially if used in sports bracing), working consistently when mounted on soft (e.g., stitched) and hard (e.g., molded) braces, working on flat and curved surfaces, and the like.
Most braces are designed to wrap around a part of the body and thus must be opened and closed over the body. The detachable guides described herein are placed on the brace to allow patients to quickly and easily wrap and close the brace around the body. To tighten the brace around a limb or body part, a proximal end of the detachable guide is typically coupled with a tension member, such as straps, cords, lace, and the like. For convenience in describing the various embodiments, the disclosure generally describes the tension member (e.g., straps, lace, and the like) being tensioned via a reel or dial assembly (hereinafter reel assembly). The reel assembly typically closes the article or brace, or one or more components thereof, by tensioning the tension member. For example, a knob of the reel assembly may be twisted to wind lace within a spool housing and about a spool. Although the disclosure generally describes the tension member being tensioned via a reel assembly, it should be realized that any tightening mechanism may be used and the disclosure is not limited to only those embodiments described herein. For example, in some embodiment, the tightening mechanism may include a pull-cord type device where the user grasps and pulls the pull-cord to tension the tension member. Other embodiments may use ratchet-type mechanisms that include straps or other components having ratchet teeth that interact with the ratchet device to tension the tension member.
Referring now to
In some embodiments, the lacing configuration of closure system comprises two distinct lacing systems 22a, 22b. In some embodiments, each lacing system 22 includes a lace or cable 23 that is threaded through portions of the orthopedic brace and attached at opposite ends to a reel assembly 25, which includes a control such as a lever, crank or knob that can be manipulated to retract the lace 23 within a spool housing (not shown) and about a spool (not shown). The reel assembly 25 may include a mechanism of release, such as a button or lever, for disengaging the reel assembly 25, to permit the lace 23 to be withdrawn freely. In other embodiments, the reel assembly 25 may be pulled upward to allow an internal spool to spin and the lace to be pulled freely. In yet another embodiment, the reel assembly 25 may be unwound (e.g., counterclockwise) to release the spool and allow the lace to be pulled, or to unwind the lace. As shown in
The orthopedic brace 20 shown in
As shown, each of the cuffs 10, 12 are generally formed from a single piece of material that is wrapped around itself, forming two ends 32, 34 that are drawn towards each other and, in fact, may overlap. Although the ends 32, 34 are shown in an overlapping position, it should be understood that these ends might also be sized to be separated by some distance when the orthopedic brace 20 is tightened. Generally, the lace 23 may be tensioned to draw the ends 32, 34 past each other and thereby tighten the orthopedic brace 20 about the user's limbs. As is readily understood in the art, the two ends 32, 34 of brace 20 are designed to be open and fit about the user's leg. The two ends 32, 34 are then positioned over the leg and brace 20 is tightened as described above.
In some embodiments, the retaining members 140 are configured to be releasably engaged with guides 150 opposite the reel assembly 125. The engagement may be by way of a quick release mechanism 142, for example the detachable guides described herein. In other embodiments, Fastex® buckles (not shown), Velcro® or other similar mechanisms known to those of skill in the art may be used. As shown in greater detail in
Closure system 122 may include additional gross adjustment features in combination with the quick release mechanism 142 to provide a gross or macro adjustment of the brace 120 (and/or adjustment of a closing pressure of the brace) prior to use of the reel assembly 125 to tighten the brace about the limb. For example, the closure system 122 may include ladder locks (e.g., Fastex Slider®) which allow the retaining members 140 to be lengthened or shortened as needed. Though shown with two retaining members 140, as with the other embodiments disclosed herein in some embodiments, the number of retaining members 140 may be varied. In some embodiments, three, four, five, six or more retaining members 140 may be desirable.
On advantage of using the above described braces is the increased ability of the brace to fit a conical shape and/or adjusting shape, such as a leg, arm, or any other part of a user's body. The ability of the brace to fit a conical shape is provided by the lacing system. For example, as the brace is fit about a conical shape (e.g., the leg) and the lace wound via the reel assembly, an upper portion of the brace contacts the conically shaped object. As the lace is wound, the lace adjusts until the lower portion of the brace also contacts the conically shaped object (e.g., the leg). Additional winding of the lace will result in an approximately equal tension throughout the lace since the lace is able to slide relative to the lace guides, which provides a relative even pressure of the brace about the conically shaped object. Accordingly, the brace 20 fits well on the conical shape.
Similarly, the brace is able to adjust to changes in the shape of the object, such as changes in the shape of a leg (or other body part) due to flexing and/or relaxing of the muscle. For example, as a leg is flexed and assumes a more cylindrical shape, the lace is able to slide relative to the lace guides so that a bottom portion of the brace opens or widens as a top portion contracts or shrinks. Conventional braces typically do not adjust in this manner and thus, when a patient flexes their leg (or other body part) the brace is typically forced or encouraged to move, such as downward against the knee. Because the lace is able to slide relative to the brace and guides and the brace is able to adjust to changes in shape, the fit or hold of the brace about the body part is increased.
The detachable guides similarly provide several advantages over conventional brace closure technology. For example, the use of buckles, Velcro®, or other similar mechanisms often require the user to use both hands in opening and/or closing the brace. For example, to couple the male and female components of a buckle, the user is often required to grasp the female component with one hand while the male component is being inserted into the female component to ensure that the female component will remain in position during coupling of the components. Similarly, in closing Velcro® straps, the user often must thread a distal end of the strap through a d-ring or hook before tensioning and folding the strap back on itself. The user often must hold the d-ring or hook while the strap is being threaded through the d-ring. Requiring the use of both hands is often inconvenient, frustrating, and/or annoying to the user, and potentially not an option for dexterity compromised or handicapped individuals. Likewise, donning and doffing the brace in this manner may be needlessly time consuming.
The use of buckles, Velcro®, or other similar mechanisms also allows the brace to be uncoupled while tension remains in a strap and/or while tension is being applied to a tension member via a reel assembly or other tightening mechanism. For example, the brace may be fit about the user's limb and a reel assembly used to tighten the brace about the limb. Without releasing tension in a strap or lace of the brace, the user may unbuckle or unstrap the brace to release brace pressure and/or remove the brace, such as for adjustment. Upon refitting the brace about the limb, the reel assembly may again be used to retighten the brace about the limb. Continual retightening of the brace in this manner causes an increased amount of the lace to be wound about the reel assembly's spool, which limits the amount of lace that is available for tightening the brace. Continual winding of the lace about the reel assembly's spool also results in over-storage of the lace within the reel assembly's housing, which may negatively affect the performance of the reel assembly.
The detachable guides described herein remedy these and other issues associated with conventional braces as described hereinbelow. For example, the detachable guides have relatively low profile in a closed configuration that helps avoid snagging or catching of objects close to the user. In some embodiments, the detachable guides may be configured to lie nicely under an individual's clothing to allow the brace to be worn without being noticed by others. The detachable guides may also be aesthetically pleasing compared with conventional guides and have a lower profile that offers a lighter and more sleek look and/or feel. The detachable guides also may be coupled and/or uncoupled with one hand to allow the user to don and doff a brace or other article relatively easily. The detachable guides also remain coupled while under tension or load (e.g., via the tension member) to avoid problems of over storage of the lace within the reel assembly or other tightening mechanism, such as by continual shortening of the lace as described above. The detachable guides further allow the male component to be fully disengaged from one side of the brace, which allows the brace to be fully opened and laid flat.
Referring now to
As shown in greater detail in
In some embodiments, the male component 404 may include an audible feedback mechanism that provides audible feedback to a user that indicates coupling and/or uncoupling of the male and female components, 404 and 402. For example, in some embodiments the male component includes a flange member or pair of snap tabs 426 that fit over, or otherwise engage, a grooved post 424 of the female component 402 when the male and female components, 404 and 402, are mated together. The snap tabs 426 may make an audible “snap” sound when mated with the grooved post 424 to audible alert the user that the male and female components, 404 and 402, are coupled together. For example, the snap tabs 426 may snap into engagement with the grooved post 424 to produce the audible feedback during coupling of the components. The snap tabs 426 may also provide tactile feedback that coupling of the components has occurred so that the user is able to tactually recognize when coupling occurs.
The male component 404 typically includes a tension member component that allows a proximal end of the male component 404 to be coupled with a tension member, such as a strap or lace. The tension member (e.g., strap, lace, and the like) may be tensioned via a tensioning or tightening mechanism to apply tension to the male and female components, 404 and 402. The configuration of the stepped protrusion 422 and the stepped recess 420 of the male and female components, 404 and 402, prevents the male and female components from being released or uncoupled while an appreciable amount of tension exists in the tension member. For example, as described herein, to couple the male component 404 with the female component 402, the stepped protrusion 422 is typically inserted within the stepped recess 420 at an angle and then the male component 404 is rotated downward relative to the female component 402 to position the flange 423 adjacent the recessed portion 429 of the stepped protrusion. Tensioning of the male and female components, 404 and 402, pulls the stepped protrusion 422 proximally to engage the stepped protrusion 422 with the lip of stepped recess 420. An appreciable amount of tension in the tension member prevents the male component 404 from being counter-rotated (i.e., rotated upward), which is typically necessary for uncoupling of the male and female components, 404 and 402. Accordingly, the male and female components, 404 and 402, are not releasable while an appreciable amount of tension remains in the tension member. The reference to an appreciable amount of tension means that some minimal amount of tension may exists in the tension member while the components are uncoupled, but the tension is far less than a tension that is normally applied to close an article about a limb.
As shown in
A distal end of the lace 408 may pass through and/or around a guide 412 that is coupled with an opposite side of the brace. Similarly, a floating or mid-point guide 411 may be positioned between the reel assembly 410 and guide 412. The lace may be inserted through channels of the floating guide 411 for lace management purposes and/or to keep the lace 408 aligned about a desired lace path.
The configuration of the stepped protrusion 422 and stepped recess 420 allows the male and female components, 404 and 402, to be coupled or mated with essentially a single translational movement. Stated differently, the translational movement of the male component 404 relative to the female component 402 may include a movement in a first direction (i.e., in the direction of the arrow) without a significant movement in an opposite direction since the flange 423 is inserted within the coupling aperture and then merely rotated into position within the coupling aperture. The term “significant movement” in describing the reverse movement means that some small reverse movement may occur, but it such movement is relatively minor compared to the movement of inserting the flange 423 within the stepped recess. Because the male and female components, 404 and 402, may be coupled via essentially a forward movement and little to no reverse or backward movement, the amount of slack needed in the lace, strap, or other tension member is greatly reduced. Stated differently, slack is not needed in the lace, strap, or tension member since the male component 404 does not travel beyond the female component 402 and then retract relative thereto. As such, the amount of lace, strap, or other tension member used may be reduced and additional tightening of the brace is not needed to wind lace and/or remove unneeded slack.
The configuration of the stepped protrusion 422 and stepped recess 420 also allows the flange 423 to be inserted within the coupling aperture at relatively low angles, such as at less than 45°, less than 30°, and in some embodiments less than 25° or 20°. Because the flange 423 is insertable within the coupling aperture at relatively low angles, a distal tip of the flange 423 need not break a plane of the bottom surface 433 of female component 402. In such embodiments, the distal tip of flange 423 need not poke or contact the brace which is positioned below and coupled with the female component 402 and thus, need not poke or job the user's limb around which the brace is positioned. As such, the user may couple the male and female components, 404 and 402, and close the brace about a limb without poking or jabbing the limb.
Further, as described above, the coupling or mating process illustrated in
In other embodiments, the male and female components may be uncoupled in a reverse manner to that describe above for
As can be readily understood, when the mated components are placed in tension the stepped protrusion and stepped recess prevent the male and female components from uncoupling. Uncoupling of the components occurs in a manner opposite of that described to couple the components. Specifically, the male component is lifted vertically to rotate the male component relative to the female component. The stepped protrusion of the male component is then withdrawn from the stepped recess of the female component. Because the male and female components are uncoupled in this manner, it is difficult to uncouple the components while they are in tension. Accordingly, a user must usually un-tension the lace winding system in order to uncouple the two components, which reduces or prevents lace shortening and over storage of the lace within the tightening mechanism as described herein.
Referring to
The proximal end of male component 504 may include a raised portion or arcuate recess 540 that facilitates in coupling and uncoupling of the components by allowing a user to place one or more fingers under the raised portion 540 and grasp a bottom surface of the male component 504. The user may position a thumb on the upper surface of the male component and a finger or fingers under the raised portion 540 and thereby grasp the male component with the thumb and fingers. In this manner, the user may easily couple and uncouple the two components.
In some embodiments, the male component and female components described herein may include magnets or other features that facilitate in coupling the two components. For example, the stepped protrusion may include a magnet and the stepped recess may include a magnet to allow the stepped protrusion to “self-find” the stepped recess. Stated differently, the magnets may attract the stepped protrusion toward the coupled position within the stepped recess and/or guide the stepped protrusion toward the stepped recess. Such embodiments may make coupling the components with a single hand even easier. In another embodiment, adjacent stepped protrusions on a brace may have magnets that are oppositely polarized. Similarly, adjacent stepped recesses may also have magnets that are oppositely polarized. In such embodiments, cross connecting of male and female components, or in other words wrongful connecting of male and female components, is reduced since male and female components having magnets with the same polarization will be repelled.
Referring to
In some embodiments, the female component may have an arcuate configuration that corresponds to a shape of the brace or other article. In such embodiments, the male component may have a generally planar configuration. Tensioning or tightening of the male and female components (e.g., via lace and a reel assembly) may cause the male component to rotate into an increased engagement with the female component. For example, the rear surface of the tab (see 421 of
In one embodiment, the single lumen lace guide (i.e., the combined lace guides 1112) may be constructed during a molding process by inserting a tooling (metal or other composition) through opening 1110 and into the lace track. A second tooling piece, or multiple tooling pieces, may be inserted in the opposite direction through guide tracks 1112 and into the lace track so as to mate or closely fit with the tooling inserted through opening 1110. This fit of the various tooling eliminates or greatly reduces the overflow of the injected material between the tooling parts. Conventional process that involve mating tooling only from an underside (or topside) of the piece often result in inconsistent mating of the tooling and flash or overflow between the tooling, which may create a relatively rough lace track that is difficult to feed lace through. The same process may be repeated at the lace receiving portions 1108 where the lace enters and exits the male component 1104 to provide a single smooth lace track through which the lace is inserted.
The male component 1104 also includes a raised portion 1106 that allows a user to position one or more fingers on an undersurface of male component 1104 and one or more fingers on a top surface of male component 1104 to grasp the male component 1104 and insert the stepped protrusion into the stepped recess or remove the stepped protrusion therefrom. The male component may also include the various other features described herein.
Although not shown, in some embodiments when the male component is not coupled with the female component, the male component may be stowed on the brace to keep the male component free from catching onto surrounding objects. For example, the male component may couple with a strap, tightening mechanism or reel, or another object near to the component.
In other detachable device embodiments, a reel assembly may climb or ratchet up a perforated strap to tighten a brace. For example, the strap may have a plurality of apertures spaced at even intervals. As the reel or other mechanism is operated, the reel assembly may ratchet up the apertures or pull the strap through the reel assembly. In some embodiments, guides may be positioned in the various apertures or ratchet up the aperture as the mechanism is tightened.
As described herein, the detachable guides are able to withstand relatively high tension loads before experiencing failure. One reason for this is the configuration of the stepped protrusion and stepped recess, which experience tension in shear rather than in bending. The configuration of the detachable guides provides tension member coupling components that have a small and low profile, yet achieve high failure strengths. For example, referring now to
As shown in
To verify the results of the FEA calculations, a physical model of a detachable guide having a height of 5 mm and a width of 25 mm was constructed and the detachable guide was placed under 200 lb tension to measure the actual failure strength. The observed failure strength of the physical model closely corresponded to the calculated FEA value of roughly 712 N/cm2. According to one embodiment, the failure or pull strength of the physical model was about 700 N/cm2±20%. The ratio of failure strength to cross sectional area achieved by the detachable guides described herein are far greater than similar ratios achieved by conventional buckles or coupling components. As compared with other conventional side release buckles, the strength efficiency of the detachable guides, particularly for thickness, is more efficient because less bending stress is involved. As such, the detachable guides described herein exhibit a unique combination of reduced size and increased strength.
As described herein, the detachable guides may be made of various materials. In one embodiment, the material may be a Nylon, Acetal, Polycarbonate (PC), and/or other material. In some embodiments, the material may be selected to provide a yield strength within the range of 50 to 90 MPa and/or a flexural modulus of 2,000 to 3,500 MPa. In other embodiments, the yield strength may be between about 60 and 85 MPa and the flexural modulus may be between about 2,600 and 3,000 MPa. Table 2 below provides various properties of materials that may be used for the detachable guides described herein. Specifically, the properties include the modulus and tensile strength of 3 materials: Polycarbonate (PC), Polyoxymethylene (POM)—an Acetal, and a Nylon material—i.e., Ultramid® A3K Uncolored Polyamide sold by BASF.
Having described several embodiments, it will be recognized by those of skill in the art that various modifications, alternative constructions, and equivalents may be used without departing from the spirit of the invention. Additionally, a number of well-known processes and elements have not been described in order to avoid unnecessarily obscuring the present invention. Accordingly, the above description should not be taken as limiting the scope of the invention.
Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limits of that range is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed. The upper and lower limits of these smaller ranges may independently be included or excluded in the range, and each range where either, neither or both limits are included in the smaller ranges is also encompassed within the invention, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included.
As used herein and in the appended claims, the singular forms “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a process” includes a plurality of such processes and reference to “the device” includes reference to one or more devices and equivalents thereof known to those skilled in the art, and so forth.
Also, the words “comprise,” “comprising,” “include,” “including,” and “includes” when used in this specification and in the following claims are intended to specify the presence of stated features, integers, components, or steps, but they do not preclude the presence or addition of one or more other features, integers, components, steps, acts, or groups.
This application claims priority to U.S. Patent Application No. 61/722,022 filed Nov. 2, 2012 entitled “COUPLING MEMBERS FOR CLOSURE DEVICES AND SYSTEMS,” the entire disclosure of which is hereby incorporated by reference, for all purposes, as if fully set forth herein.
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| Number | Date | Country | |
|---|---|---|---|
| 20140123440 A1 | May 2014 | US |
| Number | Date | Country | |
|---|---|---|---|
| 61722022 | Nov 2012 | US |
