Abstract
A cord lock device is provided, which includes a body having first and second faces, with a cord passage extending through the body between the first and second faces. First and second grip channels are formed in the first face and have respective first ends adjacent to the cord passage and second ends extending away from the cord passage. Each of the grip channels has a pair of grip teeth facing each other on opposite sides of the respective grip channel, ridges of the pairs of grip teeth extending from the first face toward the second face at an angle such that at the first face, the ridges are furthest from the cord passage, while at a point closest to the second face, the ridges are closest to the cord passage.
Claims
1. A device, comprising: a body, having: an upper face, a lower face on a side of the body opposite the upper face, a front body end, and a rear body end on an end of the body opposite the front body end; a cord passage extending through the body between the upper face and the lower face; a first grip channel formed on the upper face and having a first end adjacent to the cord passage and a second end adjacent to the rear body end, the first grip channel having a first pair of grip teeth facing each other on opposite sides of the first grip channel, ridges of the first pair of grip teeth extending, in the first grip channel a rear-to-front, downward angle, such that the ridges are closest to the rear body end at their uppermost ends, while the ridges are closest to the front body end at their lowermost ends, where they terminate against the upper face; and a second grip channel formed on the upper face substantially parallel to the first grip channel and having a first end adjacent to the cord passage and a second end adjacent to the rear body end, the second grip channel having a first pair of grip teeth facing each other on opposite sides of the second grip channel, ridges of the first pair of grip teeth extending, in the second grip channel, at a rear-to-front, downward angle, such that-the ridges are closest to the rear body end at their uppermost ends, while the ridges are closest to the front body end at their lowermost ends, where they terminate against the upper face.
2. The device of claim 1, wherein: the first grip channel has a plurality of pairs of grip teeth, including the first pair of grip teeth of the first grip channel; and the second grip channel has a plurality of pairs of grip teeth, including the first pair of grip teeth of the second grip channel.
3. The device of claim 1, wherein a distance between the ridges of the first pair of grip teeth of the first grip channel to a smallest dimension where the ridges terminate against the upper face.
4. The device of claim 1, wherein the cord passage has an arcuate shape with ends of the cord passage lying adjacent to the first ends of the first and second grip channels, respectively.
5. The device of claim 1, wherein a smallest distance between the ridges of the first pair of grip teeth of the first grip channel defines a minimum channel dimension.
6. The device of claim 5, comprising: a first elastic cord extending through the cord passage and along the first grip channel and having a transverse dimension, while relaxed, that is greater than the minimum channel dimension; and a second elastic cord extending through the cord passage and along the second grip channel and having a transverse dimension, while relaxed, that is greater than the minimum channel dimension.
7. The device of claim 6, wherein the first and second elastic cords are first and second ends of a shoelace, respectively.
8. The device of claim 6, wherein the first and second elastic cords are first and second sides of a loop, respectively.
9. The device of claim 1, wherein a thickness of the body between the upper and lower faces is greater adjacent to the front body end than at the cord passage.
10. The device of claim 1, wherein the lower face is substantially planar.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) FIG. 1 is a perspective view of a shoe assembly including a lace lock according to an embodiment of the invention;
(2) FIG. 2A is a plan view of the lace lock of the shoe assembly FIG. 1, according to an embodiment;
(3) FIG. 2B is a rear elevational view of the lace lock of FIG. 2A;
(4) FIG. 2C is a side sectional view of the lace lock of FIG. 2A, taken along lines 2C-2C in FIG. 2A;
(5) FIG. 2D is a perspective view of the lace lock of FIG. 2A;
(6) FIGS. 3A-3C illustrate characteristics of elastomeric materials under respective different conditions;
(7) FIG. 4 is a plan view of a lace lock of FIGS. 1-2D, showing the device in locking engagement with the ends of elastic shoelaces;
(8) FIG. 5 is a side elevation view showing the lace lock of FIG. 4 in cooperation with a finger of a user during a process of engaging the elastic laces;
(9) FIGS. 6A-6D are views of a lace lock according to another embodiment of the invention, each view corresponding to a respective one of FIGS. 2A-2D;
(10) FIG. 7 is a perspective view showing a lace lock system 700, according to an embodiment;
(11) FIG. 8 is a side elevational view of a cord tensioning system 800, according to an embodiment; and
(12) FIG. 9 is a top plan view of a lace lock 900 according to an embodiment.
DETAILED DESCRIPTION
(13) In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar reference characters typically identify similar components, unless context dictates otherwise. Other embodiments may be used and/or other changes may be made without departing from the spirit or scope of the disclosure. For ease of understanding, the terms forward, front, rearward, back and the like, as used in this description, refer respectively to the directions or relative locations proximal (towards) and distal (away) from the perspective of a user wearing a shoe or other article of footwear (i.e., the forward end is towards the ankle and the rearward end is towards the toes); similarly the terms upper, top and lower, bottom refer to the dorsal and plantar directions from the perspective of such a user.
(14) FIG. 1 is a perspective view of a shoe assembly 100, according to an embodiment, which includes a shoe 102 and a lacing system 104. The lacing system includes a shoelace 106, a lace lock 108, and an end cap 110. The shoe includes a plurality of eyelets 112 through which the shoelace 106 is threaded in one of a number of well-known lacing patterns. In the embodiment shown, the shoelace 106 is threaded such that the shoelace ends 114 pass out through the last eyelets 112a from the tops of the respective eye stays 116. This positions the lace lock 108 somewhat above the shoelace 106 in the throat 118 of the shoe 102. Alternatively, the shoelace 106 can be laced such that the shoelace ends 114 exit the last eyelets 112a from the underside of the respective eye stays 116, which positions the lace lock 108 in a lower position between the eye stays 116 and closer to the tongue 120. Depending upon the circumstances, one or the other of these two arrangements may be advantageous. However, the particular lacing pattern used is a matter of user preference, and any suitable pattern can be used. According to an embodiment, the shoelace 106 is made of round elastic cordsimilar to those commonly referred to as shock cords, or bungee cords, but having diameter, length and elasticity suitable for use as shoelaces. Without limitation, typical examples of such laces have a diameter of around 2.5-3 mm and are capable of stretching to about 150-175% of their un-tensioned length, and are generally cut to lengths between about 20 and 84 inches depending on shoe size and type, number of eyelets and other factors.
(15) The term last eyelets is used here to refer to the eyelets 112a that are closest, along the length of the shoelace 106, to the shoelace ends 114. In many cases, these will be the uppermost eyelets 112, but this is not always the case, as illustrated in the example of FIG. 1.
(16) The lace lock 108 is configured to receive the lace ends 114 and hold them at a selected length. In operation, a user threads the shoelace 106 in the eyelets 112 in a selected pattern, then threads the ends 114 into the lace lock 108, as described in more detail below, with reference to FIGS. 4 and 5. While wearing the shoe 102, the user draws the laces 106 to a comfortable tension and holds or slides the lace lock 108 along the ends 114 to a position approximately between the last eyelets 112a. The user then engages the lace lock 108, which grips the ends 114 of the shoelace 106, preventing the shoelace ends 114 from sliding back and relieving the tension. The user may then cut the shoelace ends 114 to a convenient length, and optionally bind the tips together using an end cap 110, as shown in FIG. 1, or by tying a knot. Endcaps are very well known in the art, being commonly used to bind the ends of a length of shock cord, to form a loop, and so on.
(17) When the user desires to remove the shoe, the shoelace ends 114 can be released from the lace lock 108, permitting the extreme ends of the shoelace to slide back through the lace lock 108 until the end cap 110 reaches the lace lock, substantially releasing the tension and loosening the shoe assembly 100 while the end cap 110 prevents the lace lock from being separated from the shoelace.
(18) Depending upon the tension selected by the user, and the characteristics of the shoelace 106, the shoelace 106 may retain sufficient residual resiliency while tensioned to enable the user to remove and re-don the shoe 102 without releasing the lace lock 108, such that the shoelace need only be tightened and locked once. In other applications, the user may desire a more secure attachmentrequiring a higher shoelace tensionor at least a lower residual resiliency, necessitating the release of the lace lock 108 prior to removal of the shoe. This may be the case, for example, when the lacing system 104 is employed with athletic shoes, hiking or climbing shoes, boots, military footwear, and other footwear intended for strenuous and/or high-risk activities.
(19) Turning now to FIGS. 2A-2D, the lace lock 108 is shown in detail. FIG. 2A is a plan view of lace lock 108, FIG. 2B is a rear elevation view, FIG. 2C is a side sectional view of the lace lock, taken along lines 2C-2C of FIG. 2A, and FIG. 2D is a perspective view of the lace lock 108. For the purposes of clarity in the use of directional/positional terms in the description that follows, it can be assumed that the lace lock 108 is oriented substantially as shown in FIG. 1, although no such limitation is implied with respect to the claims or the use of such a device in actual practice.
(20) The lace lock 108 can be molded or otherwise formed as a single piece, with a body 200 having an upper face 202 and a lower face 204. In the embodiment pictured, the lower face 204 is substantially planar, while a portion of the upper face 202 lies parallel to the lower face. Another portion of the upper face 202 slopes upwardly at the front to form a raised surface over a somewhat thickened tab portion 203. A cord passage 206 extends through the body 200 between the upper and lower faces 202, 204; in the illustrated embodiment, the cord passage 206 has an arcuate shape in plan view, although in other embodiments the cord passage may have other shapes and configurations.
(21) A pair of generally parallel grip channels 208a-b is formed on the upper face 202 of the lace lock 108 in a raised area towards the rearward end. Each of the grip channels 208 includes a respective front end and back end defining longitudinal axes. The front, entrance ends of the grip channels 208 are positioned adjacent to respective ends of the arcuate cord passage 206, and a prominence 209 is defined by the raised surface between the grip channels, defining the uppermost portion of the lace lock 108. The grip channels 208 are open to the surface of the upper face 202 along their respective lengths, which permits cord or lace to be introduced into the channels from above.
(22) Each of the grip channels 208 includes one or more opposing, inwardly projecting pairs of grip teeth 210. A narrowest transverse dimension D.sub.1 is defined in each of the grip channels 208 by opposing ridges of a pair of the grip teeth 210. Likewise, a widest transverse dimension D.sub.2 is defined by a pair of opposing valleys 214 adjacent to a pair of grip teeth within each of the grip channels 208. This relationship is most clearly visible in FIG. 2B, wherein the dimensions D.sub.1 and D.sub.2 are identified. In some embodiments, a rearmost pair of a set of grip teeth 210 defines the narrowest transverse dimension D.sub.1, as in the case of the embodiment of FIGS. 2A-2D. Other embodiments are contemplated, in which others of a plurality of pairs of grip teeth define the narrowest transverse dimension, or in which a same dimension is defined between multiple pairs of teeth.
(23) According to an embodiment, the transverse distance of the gap between each pair of grip teeth 210 varies along the length and depth of each pair of teeth, as described below with reference to the embodiment shown in FIGS. 6A-6D.
(24) Referring in particular to the side-sectional view of FIG. 2C, it can be seen that the grip teeth 210 are angled with respect to a horizontal, transverse plane of the body of the lace lock, as defined in the illustrated embodiment by the lower face 204 of the body 200. Specifically, the grip teeth 210 have a forward/downward, rearward-upward slope, i.e., the ridges of the teeth are closest to the front of the lace lock 108 at the point where the teeth terminate against the upper face 202 of the body 200.
(25) FIGS. 3A-3C illustrate characteristic behavior of an elastomeric element 300 positioned between a pair of fixed ridges 302 and configured to receive tensioning forces at opposite ends, applied along respective opposing vectors V.sub.1, V.sub.2. In FIG. 3A, there is little or no force applied to the elastomeric element 300, which is therefore in a substantially relaxed, or un-tensioned state. The distance separating the ridges 302 is smaller than a transverse dimension (e.g., diameter) of the elastomeric element 300 in its relaxed state. Accordingly, indentations are formed in the elastomeric element 300 by the ridges 302.
(26) In FIG. 3B, substantially equal tensioning forces are applied to the elastomeric element 300 along the opposing vectors V.sub.1, V.sub.2, causing the element to become elongated. As the elastomeric element 300 is stretched, its transverse dimension is reduced, until the transverse dimension is about equal to or slightly less than the distance separating the ridges 302. In this condition, the elastomeric element 300 can be moved longitudinally through the gap between the ridges with little or no resistance.
(27) In FIG. 3C, a tensioning force is applied to the elastomeric element 300 along the vector V.sub.1 while little or no force is applied along the opposing vector V.sub.2. The result is that a bulge forms in the elastomeric element 300 on the side of the ridges 302 opposite the source of the tensioning force. The result is that the ridges 302 form an engagement that resists longitudinal translation of the elastomeric element 300. The degree to which movement of the elastomeric element 300 is resisted is controlled by factors such as, for example, the transverse dimension of the elastomeric element while in its relaxed state relative to the separation distance of the ridges 302, the specific geometry of the fixed ridges 302, the durometer of the material of the elastomeric element, the relative values of forces applied along the opposing vectors V.sub.1, V.sub.2, etc.
(28) As noted with reference to the embodiment of FIG. 1, a suitably sized shock cord is a preferred material for the shoelace 106. This type of cord has a core comprising a plurality of strands of an elastomeric materiale.g., natural or synthetic rubberthat is bound inside a sheath or tube of woven material, typically cotton or nylon. The degree of force required to stretch the cord is a function of the durometer and total cross-sectional area of the elastomeric core. In some cases, the woven sheath is designed to limit the maximum length to which the cord can be stretched. Typical shock cord has characteristics that are substantially similar to those described with reference to FIGS. 3A-3C, i.e., when tension is applied to the cord, the elastomeric core stretches, while its transverse diameter reduces, and when the cord is confined within a restricting passage, longitudinal force, applied unevenly to opposing ends, will result in resistance to translation of the cord.
(29) FIG. 4 is a plan view of a lace lock 108 described with reference to FIGS. 1-2D, showing the device engaging ends 114 of a shoelace, according to an embodiment. The ends 114 extend from the last eyelets 112a (as shown in FIG. 1) on opposite sides of the lace lock 108, and pass from under the lace lock through the cord passage 206, exiting the cord passage at the upper face 202 of the body immediately adjacent to the respective forward ends of the grip channels 208. Ends 114 then extend into the grip channels 208 from the forward ends, exiting from the back ends of the grip channels. It will be noted that the cord passage 206 is the only opening through which the user (or a caregiver) must thread the laces, and that the passage is relatively wide and allows both lace ends to be pushed through at the same time, hence only minimal effort and dexterity is required to install the lace lock 108 and ready it for use:
(30) The arcuate shape of the cord passage 206, extending to the sides and rearwardly from the central area of body 200, acts to separate and guide the two laces towards the entrances of the grip channels 208 in response to the ends of the laces being pulled/tensioned towards the rear of the lace lock, i.e., in the direction towards the grip channels. A transverse dimension/diameter of the shoelace 106 and the narrowest transverse dimension D.sub.1 of the grip channels 208 of the lace lock 108 are selected such that the shoelace ends 114 interact with the grip channels substantially as described with reference to FIGS. 3A-3C, i.e., while the shoelace ends are under sufficient tension, they can be easily positioned within the grip channels, but when tension is applied in only one direction the grip channels resist movement of the shoelace ends through the lace lock.
(31) FIG. 5 shows the shoelace ends 114 during the process of engaging the lace lock 108. As explained above, in use the user tensions the shoelaces 106 to the desired degree, and the lace lock 108 then engages the shoelaces to prevent loss of tension. Accordingly, to engage the lace lock 108, the user simply grasps the shoelace ends 114 near the end cap 110, and draws the lace ends 106 rearwardly to apply the desired tension to the shoelace. With the other hand, the user concurrently applies downward pressure to the thickened tab 203 at the front of the lace lock 108. As can be seen in FIG. 5, the upwardly sloped surface of the proximally-thickened tab is dimensioned and contoured to be pressed under the thumb of a user's hand. Optionally, the index figure (or other finger) of the same hand may simultaneously contact the lower surface 24 of the lace lock 108 at a more rearward location generally under the area of the grip channels 208a-b.
(32) The downward pressure transmitted by the lace lock 108 onto the forward portions of the shoelace ends 114 traps the shoelace ends, while the lace lock tends to pivot, or rotate, under the same pressure, as shown in FIG. 5. While applying the downward pressure, the user pulls the shoelace ends 114b in a downward and rearward direction, from the lace lock 108. The rearward/distal force causes the shoelace ends 114b to elongate and thin, while the downward force causes the shoelace ends 114 to drop into the grip channels 208. When the shoelace has been tightened and the shoe cinched to the desired extent, the user releases tensioning force on the rearward portions of the shoelace ends 114a, which permits the rearward portions of the elastic laces to return to their relaxed state, such that a diameter of the rearward portions of the elastic laces swells to exceed narrowest transverse dimension D.sub.1 of the grip channels 208. In this condition, the lace lock 108 resists any loosening of the shoelace 106, substantially as described above with reference to FIG. 3C, holding and maintaining the lace at the desired tension.
(33) As explained above with reference to FIG. 2D, the grip teeth 210 of the grip channels 208 are angled downwardly towards the forward end of the lace lock 108. Thus, while the lace lock 108 is in engagement with the shoelace ends 114a-b positioned within the grip channels 208, tension applied to the forward portions of the shoelace ends 114a will tend to draw the shoelace ends even more deeply into the channels and tightly against the upper face 202 of body 200, rendering the engagement increasingly secure.
(34) Referring again to FIG. 4, it can be seen that during the engagement process, while the shoelace ends 114 are under tension, the ends of the cord passage 206 serve to position the shoe lace ends directly over/in front of the respective grip channels 208a-b, simplifying engagement. The two ends of the arcuate cord passage 206 are preferably located closely proximate to (e.g., within 1-2 mm, and preferably no more than a full diameter of the lace) or contiguous with the forward entrances of the grip channels 208, so that the lace ends enter the grip channels at a comparatively steep angle, hence, the lace ends are more easily pulled deep into the grip channels than if the lace ends were stretched a greater distance from the cord passage and therefore entered the grip channels at a shallower angle. Additionally, the upper and leading surfaces of prominence 110 are contoured to help guide the shoelace ends 114 into engagement as they are tensioned in the manner described above.
(35) To loosen the shoelacee.g., to remove the shoethe user again holds the lace lock 108 in one hand and the distal portions 114b of the lace ends in the other. The user applies a degree of tension to the lace ends 114 together with a slight upwardly pull, while holding the lace lock steady with the first hand, which results in the lace ends sliding up between the opposed grip teeth 210 of the grip channels 208 and out the tops of the channels. The lace ends 114 are then free to slide through the cord passage 206 of the lace lock 108 so as to loosen the shoe. The release process is thus exceptionally quick and easy to perform and again requires only minimal strength and dexterity on the part of the user.
(36) Turning now to FIGS. 6A-6D, a lace lock 600 is illustrated in accordance with another embodiment of the invention. The views of the lace lock 600 of FIGS. 6A-6D correspond to the views of the lace lock 108 of FIGS. 2A-2D, as described above. Elements and operation of the lace lock 600 are substantially similar, and so will not be described in detail again, although a few distinguishing features will be pointed out.
(37) Referring first to FIG. 6A, and comparing this with FIG. 2A, it can be seen that the length of the lace lock 600 is shorter relative to its width. Also, the side view of FIG. 6C shows that the shape of the lace lock 600, and particularly the shape of the portion through which the grip channels 208 pass is changed from that of the lace lock 100 described above. As shown in FIG. 6B, the grip teeth 210 of the lace lock 600 are not only angled downwardly, but also inwardly, so that the narrowest transverse dimension is defined by the distance between a pair of grip teeth 210 at the point where the teeth meet the upper face of the body 200.
(38) Because the grip teeth 210 of the lace lock 600 are angled inward, tension tending to loosen a shoelace will draw the shoelace ends 114 downwardly into the narrower portions of the grip channels 208, which significantly increases the strength of the engagement. Thus, the grip channels 208 can be shorter without significant loss of effectiveness.
(39) The embodiment of FIG. 1 shows the lace lock 108 used with a shoe lacing system and oriented such that the lace ends 114 extend forward, with the extreme ends and end cap 110 lying over the laces 106 of a shoe. Subsequent embodiments and descriptions are disclosed in the context of a similar application and orientation. However, this orientation and use are merely provided as an example. Other orientations and uses are contemplated.
(40) For example, FIG. 7 is a perspective view showing a lace lock system 700, according to an embodiment, in which a lace lock 108 is oriented in a direction opposite that shown in the system 104 of FIG. 1. In the system 700, the extreme ends of the lace ends 114 extend upward, away from the shoe 702 so that they are substantially covered by the user's trouser cuff 704. Some users may prefer this arrangement as presenting a neater appearance.
(41) FIG. 8 is a side elevational view of a cord tensioning system 800, according to an embodiment. The cord tensioning system 800 includes a lace lock 802 in use to control tension on a cord 804 extending through a hem 806 of a garment, such as a jacket. In the embodiment shown, the lace lock 802 has a round shape, but otherwise includes elements described with reference to other embodiments, including a cord passage 206 and grip channels 208. The cord 8804 is threaded inside the hem 806, with a loop 808 of the cord passing outside the hem between a pair of apertures 810 in the fabric of the hem. The loop 808 passes up through the cord passage 906, then each side of the loop passes through a respective one of the grip channels 208. To adjust the tension of the cord 804, a user grasps the end of the loop 808 with one hand and the lace lock 802 with the other hand. To tighten the cord 804, the user pulls the loop 808 away from the lace lock 802 while keeping the sides of the loop inside the grip channels 208, stretching and thinning the cord 804, until a desired tension is reached, then releases the loop while holding the lace lock in place. To release the tension, the user again pulls the loop 808 away from the lace lock 802 until the cord 804 is sufficiently thinned, then slides the lace lock some distance towards the loop and away from the hem 806, then releases first the loop, then the lace lock. When the lace lock 802 is released, the portion of the cord 804 between the lace lock and apertures 810 is pulled back into the hem 806 by the elastic tension of the cord, reducing the overall tension.
(42) FIG. 9 is a top plan view of a lace lock 900 according to an embodiment. The lace lock 900 is substantially similar in structure and operation to other embodiments disclosed, but in this embodiment a cord passage 902 is separated into two approximately circular passages 904, each configured to receive a respective lace end or loop side, etc.
(43) Embodiments that employ a lace or cord lock in accordance with the principles disclosed herein have a number of advantages over conventional locking systems. Typical known cord locking clamps include a spring-loaded plunger that applies pinching force to a pair of laces or cords. In order to tighten or loosen the cord, a user presses a button with a thumb to overcome the spring tension and permit movement of the mechanism. It can be recognized that such conventional system and devices can pose difficulties for many users and that they also share inherent limitations. For example, manipulating moving parts can be difficult for users who have conditions that make fine motor actions difficult or painful, such as arthritis, etc. Children may also struggle with conventional locking clamps because of the level of dexterity and/or hand strength required. Additionally, typical locking clamps tend to slip as tension increases, so the tension they can hold is limited. To achieve a strong tension, the loading spring must be made stronger, which then requires greater force on the part of the user to release.
(44) In contrast, the lace locks of the systems described herein have no moving parts that require manipulation and a user employs primarily the muscles of the arm to engage to disengage the device, rather than the weaker muscles of the thumb and fingers. Furthermore, they are capable of securing a cord against a much higher tension, enabling their use in applications where a relatively high tension is required. Finally, lace locks according to the disclosed embodiments can be manufactured in a single molding or casting process, whereas the known systems require the manufacture and assembly of multiple parts, which makes them more expensive to produce and more prone to breakage.
(45) The use of positional terms such as top, bottom, upper, lower, front, back, side, etc., is for convenience and clarity in describing and defining features and elements of the various embodiments. Likewise, arrows indicating X, Y, and/or Z axes are provided in some of the drawings to aid a viewer in recognizing the relationships of the drawings with each other. Neither the positional terms used nor the axes defined in the drawings is intended to suggest any necessary orientation of physical structures or processes on which the claims read. Accordingly, unless defined otherwise, the claims can be read on any structure or method that otherwise meets the limitations of the claim language, without regard to orientation.
(46) The abstract of the present disclosure is provided as a brief outline of some of the principles of the invention according to one embodiment, but is not intended as a complete or definitive description of any single embodiment thereof, nor should it be relied upon to define terms used in the specification or claims. The abstract does not limit the scope of the claims.
(47) Various changes can be made to the disclosed embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.
