Abstract:
A tether device includes a tether assembly disposed between two entities maintaining connection between the entities. A resilient element is integrated with the tether assembly. A geometry of the tether assembly and the resilient element create first and second resilient element and tether force-displacement responses when the resilient element and tether assembly are together subjected to at least first and second axial displacement forces. The second axial displacement force is greater than the first axial displacement force. The first force-displacement response, when subjected to the first axial displacement force, is greater than the second force-displacement response when subjected to the second axial displacement force. The geometry can include a tether configured in a serpentine formation in a relaxed position. The serpentine formation straightens taut when the tether is fully extended by the second axial displacement force. The geometry can also include multiple O-rings.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 61/269,998, filed on Jul. 2, 2009, and U.S. Provisional Application No. 61/335,330, filed on Jan. 5, 2010. The entire disclosures of each of the above applications are incorporated herein by reference. 
    
    
     FIELD 
     The subject invention is related to tethering connection devices such as those used for animal leashes, vehicle towing devices, and safety harness devices used to prevent falling injuries, sports applications such as water skiing, exercise equipment, and/or similar restraint applications utilizing a flexible connection device disposed between two entities. 
     BACKGROUND 
     This section provides background information related to the present disclosure which is not necessarily prior art. 
     There are many needs and uses in the world in which a tether or leash or some kind of attachment means is used to flexibly connect two entities together. Some flexible attachment methods are quite common and readily recognized in widespread use such as a dog leash. Another application, not in wide spread use is a tow strap between two vehicles. Still another application even less well known by the general population is a safety harness to prevent falls from elevated positions. 
     Traditional leashes and tethers and other similar applications all suffer from a common problem, and that is at the moment the tether becomes taut due to the two entities at opposing ends of the tether moving apart the tether abruptly restricts relative movement of one or both entities. This abrupt restriction to movement can cause injury, hard jerks, personal discomfort, loss of balance, and/or damage to the tether. 
     The applications and uses of tether type devices and systems are expanding for everyday life activities, work environments, sporting activities, and leisure activities. There is a great need for an improved tether type device that imposes restrictive movement between two entities and yet prevents destructive forces acting upon either the tether and/or the entities connected to the tether device. 
     In applications where animals are tethered by a human for the purposes of recreation and/or training and/or restraint, it is a common place scenario when the animal jerks or lunges in such fashion as to cause the tether device to become taut causing injury to the person and/or the animal. In addition, sudden lunging scenarios with the animal and tether device can cause the tether device to fail in response to the huge potential impact forces that can be generated by an animal&#39;s actions. Such a failure in the tether device often results in the animal getting loose presenting a danger to itself and/or others nearby. 
     There are a number of references trying to address this problem in selected applications, however, the prior examples fall short of satisfactorily resolving the issues at hand and usually at best are very limited in their application. 
     In the sport of water skiing devices such as U.S. Pat. No. 6,119,617 reveal a stand pipe fixed to a boat which includes a spring system housed inside to give the ski rope a spring give-feel to the skier. One problem with this type of device is that it is hard mounted to the boat and offers no flexibility for alternate applications. Another problem with this device is that the spring element is oriented essentially transverse to the direction of pull of the ski rope which inhibits and/or minimizes sensitivity and response time for the skier trying to remain upright and balanced. Another problem is that spring devices have a relatively constant spring rate which is not adjustable or tunable to the users needs for different spring rates during use of the product. 
     In the sport of surfing, United States Patent Application Publication 2006/0141879-A1 presents a leash device connecting a surf board to the user designed to prevent being tangled. One problem with this design is that the proposed weight increases drag in the water at a distant point of the leash and further adds a measure of mass increasing momentum whenever the user is separated from the surf board causing the inevitable taut jerk of the leash to be even more violent than it might have been otherwise. 
     U.S. Design Pat. D-571,059-S proposes a tube with a spring device housed inside. The spring housing assembly is designed to be connected between a dog collar and a leash to absorb shock. One problem with this type of device is that the spring response time is very slow compared to the response time of a dog as it lunges suddenly such that the spring does not have time to absorb shock fast enough to prevent it being transferred through the assembly to the person. Another problem with this type of device is that the weight of the assembly next to the dog collar and its relative size is bulky and distractive to the animal. Another problem is that the device has a relatively constant spring rate and does not allow a means to adjust the spring rate of shock absorption for different scenarios. 
     United States Patent Application Publication 2009/0000568-A1 proposes a shock absorbing elastic element with loops on the ends to allow a normal known leash to be wound around the elastic element in a spiral candy cane like orientation. One problem with this device is that upon stretching the elastic element the leash spirals essentially unwind trying to return to a straight leash, which does absorb some shock—the first time. However, after being unwound substantially, the leash has little or no means to wind back up and it therefore remains in a somewhat unwound state rendering further shock absorbing capabilities dramatically impaired. Another problem with this device is that the leash spirals and twists around as the elastic element stretches and the leash unwinds, which causes the entire leash to become twisted like a swizzle stick. Because the leash does not wind itself back up, the leash remains in a twisted condition. Even if the connection of the leash ends includes a swivel joint the friction of the swivel components is greater than the force required to unwind the leash spiral around the elastic element and therefore based on principles of least force resistance the swivel joints act as though they are welded solid. 
     Very few additional devices exist in the market place to address this problem with any success in any of the fields of application for the subject invention. Therefore, the subject invention overcomes these shortcomings and addresses the needs of the consumer in various applications. 
     SUMMARY 
     This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features. 
     One problem with prior tethering devices such as dog leashes is that the leash provides no means to absorb shock when the dog suddenly lunges. The reaction time of a dog is much faster than that of a person, and therefore the leash can become a taut leash before the person is ready and/or braced to resist or absorb the shock themselves. As a result, personal injury often occurs, especially when large dogs are involved. Various devices and patents trying to address this problem fail to account for the reaction time difference between the animal and the person rendering them ineffective. The subject invention addresses this problem by providing an application of the resilient device that does not have a constant spring rate; rather it provides a resilient device possessing multiple load force-displacement characteristics. 
     The subject invention provides a resilient device in which there is an initial light duty load response, that transitions into a medium duty load response, and that finally transitions into a heavy duty load response. The initial light duty load results in a force-displacement wherein relatively low force is required to displace a relatively long displacement distance. The final heavy duty load results in a relatively high force required to displace a relatively short displacement distance. A transition exists between them providing a relatively median force required displacing a relatively median displacement distance. 
     Tethering devices are commonly constructed from a wide variety of materials including, metal chains, metal cables, wire or cord type materials, rope type materials, and strap type materials. Many strap type materials include nylon, polyester, cotton, polyethylene, and many other fabric and/or fibrous materials. Regardless of the material the tethering device is constructed from, the features of the subject invention have applicable merit. 
     The resilient element of the subject invention can be constructed using any one of many resilient materials such as rubber, latex, elastic tubing, elastic cord, and manufactured using typical methods used by the respective industries from which those materials come. Those skilled in the art will appreciate that this list of construction materials is not exhaustive and that many additional materials with resilient like properties exist that could be fashioned to perform in such a way as to maintain the spirit of the subject invention. 
     In a dog leash application, the transition from light duty through medium duty and into heavy duty load responses gives the person time to brace or at least be somewhat prepared before the leash becomes a taut leash, and therefore avoids injury or even discomfort that might have otherwise resulted without the present invention. 
     Another problem with prior dog leashes is when very small petite dogs are on the leash and the person yanks on the leash unexpectedly, there is a significant exposure to injury to the animal because it is not able to anticipate the person&#39;s change in direction or pulling command, and as a result often sustains an injury. The subject invention addresses this problem by providing an application of the resilient device which includes a light duty response feature which transitions into heavier duty load response features, which gives the dog time to respond to the change in leash control and avoid injury. 
     The same features of the present invention that provides safety for small dogs is applicable to a consumer using an I-Pod, Cell Phone, or similar relatively small electronic device. Said device is provided a means to avoid shock from incidental falls out of a hand by incorporating the resilient device of the subject invention into a wrist strap tether connected to the hand-held device. 
     Another problem with prior shock absorber devices is that they can fail and break allowing the two entities at the ends of the tether to become separated and/or disconnected from each other. The present invention addresses this problem by providing a resilient device that is not a connection or link in the tether so that if the resilient device breaks or fails, the two entities are never disconnected from each other because the tether will still be intact. 
     Another feature of the resilient device is that the assembly is designed such that the ultimate tensile breaking point of the resilient element is not possible to reach before the tether is fully displaced. Therefore, the resilient element is prevented from being exposed to tensile breaking force. In addition, even if the resilient element is damaged or compromised for some reason, the tether will remain intact. 
     Another feature of the subject invention is that it provides a means to locate multiple resilient devices at various locations along the tether to accomplish very specific and/or tuned load response characteristics. One such example is a preferred embodiment of the invention wherein a light duty load response device is located on a dog leash near the dog end of the leash which is relatively light weight and non-bulky and provides the dog with instant response time if the person does something with the control of the leash that the dog did not anticipate. A second heavier duty resilient load response device is provided near the person end of the leash which is easily manipulated by the person and provides a secondary load response force allowing the person a response time if the dog does something unexpected to challenge leash control. 
     Another feature of the present invention provides a hand grip in combination with the resilient device such that the hand grip is oriented axially relative to the pull direction of the leash. This orientation of the hand grip provides a form of shock absorption by allowing the natural contours of the person&#39;s hand and the hand grip to slightly slip past each other which absorbs and dissipates substantial force while at the same time providing optimum control of the tether and the resilient device. 
     The relative axial translation and/or slippage occurs via the person&#39;s skin stretching against the hand grip and/or a relatively loose grip and/or the surface of the hand grip designed to have resilient contours that flex in response to axial translation. A further advantage and feature of the subject invention includes a wrist loop to provide a backup retention of the leash in the event the person completely loses their grip. The wrist loop also provides additional shock absorption means in combination and series with the other resilient devices in the system. 
     Another advantage of the subject invention is provided by providing a hand grip that is not secured to the leash strap but rather allowed to adjust so as to provide a means of location. The adjustable hand grip also forms a means to cinch the wrist strap tighter or looser depending upon the position of the hand grip. The axial adjustment of the hand grip is limited by use and employment of displacement restrictors which limit axial adjustment of the hand grip along the leash. One such axial adjustment restriction method is the use of stops fastened or sewn or embedded into the leash. 
     Another axial adjustment restriction method of the hand grip is the location and presence of one of the resilient devices. Another axial adjustment restriction method is the location and/or presence of a buckle or ring or other hardware. Those skilled in the art will readily appreciate there is a plethora of methods suitable to restrict axial adjustment while maintaining the spirit of the feature of the adjustable position hand grip. 
     Another advantage and feature of the subject invention is that the leash and/or components of the leash can be made from reflective materials and/or have reflective materials attachable to the leash so as to provide additional safety for walking the dog in low light situations. One preferred embodiment of the subject invention employs reflective threads sewn the length of the leash strap material. 
     Another advantage of the subject invention applied to a leash type product provides superior shock absorption for a person using the subject invention with non-domesticated animals such as horses, show cows, goats, pack animals, circus animals, carnival riding animals, parade animals, veterinarian offices, animal shelters, animal control officers, and other such scenarios. The relative unpredictability of such non-domesticated animals combined with their relative size is able to benefit greatly from the shock absorbing features of the subject invention. 
     A preferred embodiment of the subject invention envisioned for use with horses and/or large animals includes a hand grip, but does not include a wrist loop. A wrist loop may be a safety risk when tethered to a large animal because of risk of injury if said animal bolts or jerks excessively because the user can be caught in the wrist loop and unable to release themselves from the leash. Therefore, one preferred embodiment of the subject invention includes a hand grip on the end of the leash that does not feature a wrist loop. 
     Another preferred embodiment of the subject invention used as a horse or large animal leash provides a hand grip with a slight flange at the butt end of the hand grip which allows a more secure hold against pulling by the animal and yet allows the user to disengage from the leash easily and without concern of being caught or entangled. 
     Another advantage of the subject invention applied to animal leashes provides a resilient link assembly that can be connected to most common prior leashes and therefore effectively upgrade and improve prior leashes by incorporating the benefits and features of the present invention into known leashes. Typical leashes include simple tether leashes as well as the more complex retractable leashes. 
     Another advantage of the subject invention is provided by combining the resilient element positioned inside a tube structure in combination with other elements of the subject invention. The tube structure is able to house the resilient element as it extends, preventing any entanglement of the action of the resilient element with anything. In addition the esthetic attributes of the assembly are enhanced. 
     A further advantage of the tube structure is that it provides a further measure of shock absorption by providing lateral displacement similar to the flexing of a fishing pole, only not as extreme. This lateral tubular flexibility in combination with other elements of the subject invention provides substantial shock absorption and/or response time for the person and/or the animal. 
     There is an old saying that “you can pull a rope but you can not push a rope”. There is an applicable element of that saying that applies to the present invention in that with a normal leash, one can pull a dog and/or keep the animal from extending away from the person. However, with a normal leash, one can not push the dog away from the person to maintain a certain distance from the person. The subject invention addresses this problem by providing a tubular extension leash in combination with other features of the subject invention such that the tubular extension provides a means for the person to establish and maintain a certain distance between the person and the dog if need be for training and/or aggression purposes. 
     Another advantage and feature of the tubular extension in combination with other features of the subject invention is that the tubular extension can be constructed from a clear or translucent material such that a light disposed to shine through the tube from near or inside the hand grip will cause the entire tube to glow and/or provide illumination along the length of the tube while at the same time shinning out of the end of the tube on the ground similar to a flashlight. This dual purpose light housed in the tubular extension provides additional safety for walking the dog in low light situations 
     A problem with prior dog leashes which provide a retractable feature for the leash is that at times when the leash is pinched by a braking mechanism and/or the leash is at full extension, there is no means to provide shock absorption if needed. The subject invention addresses this problem by providing various shock absorbing features in combination with each other along with a retractable leash feature. The retractable mechanism can incorporate a braking feature and/or a light feature and/or pinching feature and still maintain the spirit of the subject invention. 
     Another advantage of the subject invention is that the hand grip component can be designed to house a resilient element inside in combination with a telescopic sleeve portion, which provides yet another shock absorption method which can be employed individually and/or in combination with other shock absorbing features of the subject invention. 
     Another advantage of the subject invention applied to animal leash products provides a resilient link assembly that can be connected to most any common prior leash products and therefore effectively upgrade and improve a prior leash product by incorporating the benefits and features of the subject invention into a prior leash product. Typical leash products include simple tether leashes as well as the more complex retractable leash products. 
     Another advantage of the subject invention is the application of vehicle towing straps, in that prior towing straps inevitably generate a hard jerk as the towing strap becomes a taut tether between two vehicles. This problem can cause damage to the vehicles and/or loss of control of one or both vehicles involved in the towing scenario. In addition, the frequent hard jerk that drivers of the vehicles experience using prior towing straps can cause injury or at the very least discomfort and/or uneasiness and lack of confidence that the vehicles are being maintained under control. The subject invention addresses this problem and overcomes it by providing a vehicle towing strap with resilient elements incorporated into the strap such that a taut towing strap is preceded by a gentle stretching of the resilient elements. As the resilient elements transition from relative light duty loads to heavy duty loads the vehicles are afforded the opportunity to initiate towing motion avoiding taut jerks. In prior towing straps towing motion cannot and does not initiate until after generating a taut jerk. 
     Another advantage of the subject invention applied to towing strap products provides a resilient link assembly that can be connected to most common prior towing strap products or even towing chains and therefore effectively upgrade and improve a prior towing strap or towing chain product by incorporating the benefits and features of the subject invention into a prior towing product. 
     Another advantage of the subject invention is that the resilient elements can be tuned and/or matched to the rating of the towing strap loads and are assembled such that if a resilient element fails, the towing strap remains intact to carry the full load. 
     Another advantage of the of the subject invention provides a towing hitch attachment which is attachable to common hitch bars such as the “Reese Hitch” systems. The subject invention provides such a hitch attachment with a telescopic housing and a resilient device housed therein which allows the telescopic portions of the hitch housing to slip axially relative to each other with smooth shock absorption features and capabilities. The subject invention applied in this fashion cooperates with standard prior towing straps and/or chains to effectively upgrade and improve a prior towing strap or towing chain product by incorporating the benefits and features of the subject invention into a prior towing hitch product. 
     Another advantage of the subject invention is manifested when applied to a child restraint tether product. There are numerous child safety tether products that incorporate a leash or tether product between an adult and a child to provide a measure of freedom of movement for the child while at the same time providing the adult with the assurance that the child cannot get lost in the crowd or get any farther away than the tether allows. However, one problem with prior child tether devices is that the child has a tendency to lunge suddenly in one direction or another catching the adult by surprise. Another problem with prior tether devices is that the adult can suddenly change direction on the child and catch the child by surprise. In both scenarios of surprise stated above, there is an opportunity for injury and/or unintentional discomfort at one end of the prior tether device or the other. The subject invention addresses this problem and overcomes it by providing a resilient device incorporated into the tether restraint system and/or providing a resilient link that cooperates with prior child tether devices to effectively upgrade and improve a prior child tether product by incorporating the benefits and features of the subject invention into a prior child tether product. The subject invention provides a measure of safety preventing unintentional injury to the person at either end of the tether device as well as an increased measure of assurance using the device. 
     Many applications exist in the prior records and examples in the market place of tether type devices applied as part of a safety system to prevent a person or equipment from falling from an elevated position. Examples of this kind of prior system can be found in construction for workers on bridges, steel erection, scaffolding and/or roofing. Modern installations of cell towers and wind turbines require and ever increasing number of workers and equipment to be exposed to the threat of fall from elevated positions. Still other examples of safety tethers are found being used by various utility workers, tree loggers. Still other examples of safety tether devices are found in use related to activities using a bucket on the end of an extending arm to raise a worker up to elevated positions such as tree trimming specialists, outdoor sign companies, deicing sprayers at airports, and other similar bucket trucks. Other examples of prior systems can be found applied to window washers of high rise buildings. Other prior applications include rock climbing activities, whether for sport of for rescue. Still other prior applications include warehouse workers using high-bay shelving storage systems. Still another prior application includes sport hunting using elevated tree stands and blinds from which the hunter is subject to fall injury. One problem with all of these applications of safety restraint tethers is that once the equipment and/or person falls and comes to the end of the tether; they experience a hard taut jerk. This jerk may not be as injurious as the fall might have been without the tether device, but the hard jerk stop can be quite injurious just the same and/or damaging to the equipment. The subject invention addresses this problem and overcomes the problem by providing a resilient element that is capable of either being incorporated into the prior device and/or connected to the prior device to essentially upgrade and improve a prior safety tether product by incorporating the benefits and features of the subject invention into a prior safety tether product. 
     Another advantage of the subject invention is to provide a resilient tether tie-off for water craft at dockside or other tie-off scenarios such that the secured water craft has a modicum of resilient movement to accommodate waves, tides, and/or other variant forces acting upon the secured water craft. 
     Another preferred embodiment of the subjection invention provides a cover that is permanently attached to the tether and is positioned to cover one of the resilient devices and also provide enough volume to double as a cover bag for the entire tether bundled up for storage, said dual purpose cover bag having one end fitted with draw string or other suitable closure means. 
     Another advantage of the subject invention is featured in a preferred embodiment such that a relatively mid-length leash product of about 12″ to 36″ is provided comprising a wrist loop, hand-grip, at least one resilient device, and a clasp for attaching to an animal assembled in said relatively short length for the envisioned purpose of close training, transport handling of the animal, or other times when the user desires the animal to remain in close proximity and control. 
     Another advantage of the subject invention is featured in a preferred embodiment such that a pull-toy assembly is provided wherein a relatively short length of leash strap is fitted with at least one resilient device and a hand grip is provided on one end with a chew toy provided on the other end. In one preferred embodiment of the pull-toy assembly a means is provided such that the chew toy end is replaceable. Said replacement means include a buckle, snaps, hook-latch, ties, or any one of a plethora of suitable fastening-unfastening means. In another preferred embodiment of the pull-toy a pocket is provided in the strap assembly wherein a treat for the pet can be placed and safely kept until the user is removes it. The treat cannot be reached by the animal, though it is placed such that the animal can smell it and be aware of its presence. The treat can be recovered by the user and used as a reward or other training method for the animal. Recreational users and professional dog trainers can readily make advantageous use of this type of treat delivery system because of it being combined with benefits of the resilient element features of the subject invention. 
     Another advantage of the subject invention is featured in a preferred embodiment such that a secondary wrist loop located near the animal end of a dog leash application which provides the user the ability to cinch the animal up close and secure the leash via the wrist loop. Said secondary wrist loop does not extend laterally from the axial projection of the leash so as to prevent becoming caught or entangled. One preferred embodiment of said secondary wrist loop employs a hook-latch device to assist the two parallel portions of the secondary wrist loop to stay together against each other until the user employs the secondary wrist loop feature. 
     Another advantage of the subject invention is that the resilient element converts a typical choke collar into a more humane and practical device. A choke collar is greatly improved with the resilient element incorporated into the collar. 
     Another advantage of the subject invention is that the resilient element converts a traditional Martingale type choke collar into a more humane and practical device. A Martingale type collar is greatly improved with the resilient element incorporated into the collar. 
     Other advantages and features of the subject invention will be apparent to those skilled in the art without abandoning the spirit of the subject invention, as articulated in this list of non-exhaustive claims and disclosures. 
     Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. 
    
    
     
       DRAWINGS 
       The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. 
         FIG. 1  is a perspective view of a typical prior dog leash having a wrist loop portion looped back on itself and attached at a joint with a strap length extending to an end portion clasp attached by strap loop joint; 
         FIG. 2  is a perspective view of a preferred embodiment of the present disclosure in the application of a leash; 
         FIG. 3  is a perspective view of the leash of  FIG. 2  with the resilient element extended in response to a pulling force; 
         FIG. 4  is a perspective view of another preferred embodiment leash product having a resilient element assembled into a strap of serpentine shape; 
         FIG. 5  is a front elevational view of a stretched out leash of  FIG. 4  having the serpentine strap stretched in a taut position with the resilient element in a stretched position; 
         FIG. 6  is a plan view of the leash of  FIG. 2 ; 
         FIG. 7  is a plan view of the resilient element of  FIG. 2  in a relaxed state; 
         FIG. 8  is a plan view of a resilient element having two “T-shaped” end portions separated by a shaft portion; 
         FIG. 9  is a plan view of the resilient element of  FIG. 8  in an elongated state; 
         FIG. 10  is another embodiment of a resilient element having T-shaped ends and a variable cross section resilient element; 
         FIG. 11  is a top plan view of the resilient element of  FIG. 10  in an elongated state; 
         FIG. 12  is a top plan view of another embodiment resilient element having T-shaped ends disposed at opposite ends of a variable cross section resilient element further including a continuously variable and/or tapered cross section from one end to the other; 
         FIG. 13  is a top plan view of the resilient element of  FIG. 12  in an elongated state; 
         FIG. 14  is a front perspective view of another embodiment resilient element having an elastic cord and termination knots; 
         FIG. 15  a front perspective view of another embodiment resilient element having an elastic tube with a termination knot on one end and an alternate termination folding tube and termination disk; 
         FIG. 16  is a front perspective view of another embodiment of a leash including a hand grip disposed between a wrist loop and serpentine portion containing a resilient element  37 ; 
         FIG. 17  is a front elevational view of the leash of  FIG. 16  with the serpentine portion and resilient element in an extended position; 
         FIG. 18  is a front perspective partial cross sectional view of another embodiment of a leash having a hand grip disposed between a wrist loop and a tube extension with a serpentine housed inside the tube extension; 
         FIG. 19  is a front perspective partial cross sectional view of the leash of  FIG. 18  further including an integral light and control switch housed inside the tube extension; 
         FIG. 20  is a front perspective partial cross sectional view of the leash of  FIG. 18  demonstrating lateral flexibility of the tube; 
         FIG. 21  is a front perspective partial cross sectional view of another embodiment of a leash having a hand grip disposed between a wrist loop and a retractable tether mechanism and tube extension; 
         FIG. 22  is a partial cross sectional top plan view of another embodiment of a leash having a wrist loop, a telescopic hand grip assembly with an outer housing and an inner housing, a retractable mechanism, and a leash strap; 
         FIG. 23  is a partial cross sectional top plan view of another embodiment of a leash modified from  FIG. 22 ; 
         FIG. 24  is a partial cross sectional top plan view of another embodiment of a leash modified from  FIG. 22 ; 
         FIG. 25  is a top plan view of a tether portion assembled with a resilient element to form a serpentine having ends terminated and restrained using a wrap device; 
         FIG. 26  is a top plan view of a tether portion assembled with a resilient element to form a serpentine having a hollow tube with an opening at each end; 
         FIG. 27  is a top plan view similar to  FIG. 26  of the tether portion assembled with the resilient element to form a serpentine, the hollow tube receiving an insert creating a bulge; 
         FIG. 28  is a top plan view similar to  FIG. 26  of the tether portion assembled with the resilient element to form a serpentine, having the entire length of the tunnel fixed to a tether; 
         FIG. 29  is a front perspective view of another embodiment for a towing strap; 
         FIG. 30  is a front perspective view of the towing strap of  FIG. 29  in elongated position; 
         FIG. 31  is a front perspective view of another embodiment for a towing strap having a towing strap link; 
         FIG. 32  is a front perspective view of the towing strap of  FIG. 31  in elongated position; 
         FIG. 33  is a top plan view of a heavy duty resilient element of the present disclosure; 
         FIG. 34  is a top plan view of a light duty resilient element of the present disclosure; 
         FIG. 35  is a top plan view of another embodiment of a leash including a light duty resilient element with a corresponding serpentine and a heavy duty resilient element with a corresponding serpentine; 
         FIG. 36  is a front elevational view of another embodiment of a leash having resilient elements in shapes similar to O-rings; 
         FIG. 37  is a top plan view of the leash of  FIG. 36  further showing a displacement limiter strap portion; 
         FIG. 38  is a top plan view of the leash of  FIG. 37  in an elongated position; 
         FIG. 39  is a partial cross sectional plan view of another embodiment for a towing hitch assembly; 
         FIG. 40  is a front perspective view of another embodiment of a leash having a hand grip disposed between a wrist loop and a retractable housing, further having control buttons to provide tension control for a strap; 
         FIG. 41  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use with a horse; 
         FIG. 42  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use with a dog; 
         FIG. 43  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use as a child restraint; 
         FIG. 44  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use in skiing; 
         FIG. 45  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use as a sport hunting safety restraint tether connected to an elevated tower; 
         FIG. 46  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use with a dog choke collar; 
         FIG. 47  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use with a dog choke collar on one end with a clasp attached to the leash via a ring; 
         FIG. 48  is a front perspective view of a leash of the present disclosure including a resilient element and a serpentine housed within a flexible sleeve; 
         FIG. 49  is a front perspective view of the leash of  FIG. 48  in an elongated position; 
         FIG. 50  is a front elevational view of a leash of the present disclosure having a resilient element and a serpentine assembly in use with a horse halter; 
         FIG. 51  is a front elevational view of another embodiment of the present disclosure having a resilient element weaved through holes formed by links of a chain and retained by T-shaped ends; 
         FIG. 52A  is a front perspective view of another embodiment of the present disclosure having multiple resilient elements positioned under protective covers; 
         FIG. 52B  is a front perspective view of another embodiment for a dog pull toy having a hand grip, a resilient assembly in a cover and a chew ring retained by a strap; 
         FIG. 53  is a front perspective view of another embodiment of the present disclosure wherein a resilient element does not pass through holes in tether but is attached to the tether at both ends; 
         FIG. 54  is a front perspective view of the embodiment of  FIG. 53  in an elongated position; 
         FIG. 55  is a front elevational view of another embodiment of the present disclosure wherein a gun includes a shoulder strap having a portion of the strap assembled with a resilient element and a serpentine; 
         FIG. 56  is a front elevational view of another embodiment of the present disclosure having a dog harness with an integral assembly containing a serpentine, a resilient element and an attachment ring; 
         FIG. 57  is a front elevational view of another embodiment of the present disclosure having a martingale style collar with resilient elements and serpentines in a strap portion free to slide through rings; 
         FIG. 58  is a chart showing linear force versus displacement for known tether devices; and 
         FIG. 59  is a chart showing force versus displacement for a device of the present disclosure. 
     
    
    
     Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings. 
     DETAILED DESCRIPTION 
     Example embodiments will now be described more fully with reference to the accompanying drawings. 
     Referring to  FIG. 1 , a 3D view of a typical prior dog leash is comprised of a wrist loop portion  1  looped back on itself and attached at joint  2  with strap length  3  extending to an end portion clasp  4  attached by strap loop joint  5 . 
     Referring to  FIG. 2 , a 3D view of a preferred embodiment of the subject invention is provided in the application of a strap or leash  6  with a resilient element  8  assembled through holes positioned in a serpentine  7  section. Serpentine  7  section is ready for extension of leash  6 . 
     Referring to  FIG. 3 , a 3D view of the leash from  FIG. 2  provides resilient element  8  extended in response to a pulling force applied to the ends of the leash. Once pulling forces relax resilient element  8 , the leash  6  retracts back to reform serpentine  7 . 
     Referring to  FIG. 4 , a 3D view of another preferred embodiment leash  9  includes a resilient element  10  assembled into a relatively short format of a serpentine  11  such that this embodiment can be utilized with typical prior leash products to effectively upgrade the prior product to benefit from the inherent features of the subject invention. 
     Referring to  FIG. 5 , a profile view of the stretched out leash  6  of  FIG. 3  shows serpentine  7  in a taut position while resilient element  8  is shown in a stretched position that is less than the ultimate tensile strength of the resilient element  8 . 
     Referring to  FIG. 6 , a plan view of the leash  6  in  FIG. 2  shows resilient element  8  as it passes through serpentine  7 . When not exposed to displacement forces, resilient element  8  is retracted into a natural state causing serpentine  7  to form. 
     Referring to  FIG. 7 , resilient element  8  is in a relaxed state and shows that it is comprised of a relatively long shaft portion  12  and bounded by end portions  13 . Shaft portion  12  is designed to pass through holes in the tether while end portions  13  anchor the resilient element  8 , preventing dislodgment. 
     Referring to  FIG. 8 , a close-up view of a resilient element  14  shows two “T-shaped” ends  16  and a shaft portion  15  which are inserted through holes of a receiving tether strap. 
     Referring to  FIG. 9 , the resilient element  14  of  FIG. 8  is elongated such that shaft portion  15  is thinned in cross section. 
     Referring to  FIG. 10 , an alternate embodiment is shown of a resilient element  17  in which T-shaped ends  16  are disposed at opposite ends of a variable cross section resilient element in which thin shaft portions  18  and thicker shaft portions  19  have different cross sections than each other so as to provide different load and elastic characteristics in response to applied elongating forces. A transition cross section  20  provides a smooth transition from one cross section to another, preventing stress concentration areas. Those skilled in the art will appreciate that the actual cross sectional shape, and in fact whether it is solid or hollow, is not the crucial feature that contributes to the performance and function of the resilient element, but rather that there are different cross sectional portions in the same resilient element. Those skilled in the art will also appreciate that the axial length of each cross sectional portion is not the crucial feature that contributes to the performance and function of the resilient element; rather, axial length of one cross sectional portion compared to another can be established to achieve a specifically tuned resistance-elongation ratio performance value for a specific application. Overall, the smaller the cross sectional shape, the lighter duty the load response capabilities will be for that portion of the resilient element. In contrast, progressively heavier cross sectional portions provide increasingly and correspondingly heavier duty load response capabilities. Light duty portions of the resilient element respond to elongation forces with less resistance than the larger cross sectional portions. Therefore, if a scenario occurs in which relatively light duty resistance is required, the resilient element is able to respond accordingly. In addition, if a scenario occurs in which relatively heavy duty resistance is required, the resilient element is also able to respond appropriately to the force application. 
     Referring to  FIG. 11 , resilient element  17  of  FIG. 10  is elongated such that shaft portions  18  and  19  are thinned respectively in cross section. 
     Referring to  FIG. 12 , another alternate embodiment is shown of the resilient element  21  in which T-shaped ends  23  are disposed at opposite ends of a variable cross section resilient element portion  22  and features a continuously variable and/or tapered cross section from one end to the other so as to provide a specific load and elastic characteristic in response to applied elongating forces. Transition cross section  24  provides a smooth transition from variable cross section to end  23 , preventing stress concentration areas. 
     Referring to  FIG. 13 , the resilient element of  FIG. 12  is elongated such that variable cross section resilient element portion  22  is variably thinned in cross section. The thinner portions of variable cross section resilient element portion  22  will respond easily to light duty force-displacement with longer displacement elongation, while thicker shaft portions of variable cross section resilient element portion  22  will respond to heavier force loads with shorter displacement elongation. 
     Referring to  FIG. 14 , an alternate resilient embodiment  25  employs an elastic cord  27  shown with termination knots  26 . Cord  27  is shown with a solid cross section  28 . Those skilled in the art will appreciate that the actual cross sectional size and/or shape is not the primary feature contributing to the performance and function of the resilient element. One assembly method using cord  27  would be to establish termination knot  26  and then thread the other end through the holes of a tether product, forming a serpentine as shown in previous figures. Once the serpentine is formed, the second termination knot  26  can be established. The termination knots  26  are respectively larger than the holes in the tether and are therefore prevented from passing back through the hole in response to elongation forces acting on the tether. 
     Referring to  FIG. 15 , an alternate resilient embodiment  29  employs an elastic tube  31  shown with termination knot  33  on one end and an alternate termination method comprised of folding elastic tube  31  back on itself and securing it in hole of termination disk  30 . Tube  31  is shown with a hollow tube cross section  32 . Those skilled in the art will appreciate that the actual cross sectional size and/or shape is not the primary feature contributing to the performance and function of the resilient element. One assembly method using tube  31  would be to establish termination knot  33  or an alternate termination means and then thread the other end through the holes of the a tether product, forming a serpentine as shown in previous figures. Once a serpentine is formed, a termination knot  33  or other termination means can be established. Those skilled in the art will appreciate that the particular termination means is not the primary feature contributing to the performance and function of the resilient element; rather, some kind of termination means is required that presents a feature and/or structure which is larger than the holes in the tether product and therefore prevents the resilient element termination ends from passing back through the hole in response to elongation forces. 
     Referring to  FIG. 16 , another embodiment of the subject invention is shown in which a leash  34  application includes a hand grip  35  which is disposed between a wrist loop  38  and serpentine  36  containing resilient element  37 , which arrangement maintains the relative position of the hand grip  35  from excessive axial translation relative to the leash during applied elongation force. An advantage to this embodiment is that the hand grip  35  is maintained in place without the need for any additional assembly components, minimizing assembly costs. 
     Referring to  FIG. 17 , a profile view is shown of the leash  34  in  FIG. 16  with the serpentine  36  and resilient element  37  in an extended position. 
     Referring to  FIG. 18 , a leash embodiment  39  is shown in which a hand grip  41  is disposed between wrist loop  40  and tube extension  44  with serpentine  42  housed inside tube extension  44 . Leash  45  extends out of the end of tube extension  44  such that when serpentine  42  is relaxed at rest, the end of leash  45  is not completely up inside the end of the tube extension  44 . Those skilled in the art will appreciate that how the tube extension  44  is attached to the hand grip  41  and/or whether the tube extension  44  is clear, translucent, solid, or a material that changes phases between clear and opaque, is not a primary contributor to the functional features of the subject invention. 
     Referring to  FIG. 19 , a leash embodiment  46  from  FIG. 18  is shown except with an integral light  48  included with a control switch  47  housed inside tube extension  44 . Leash  45  extends out of the end of tube extension  44  such that when serpentine  42  and resilient element  43  are relaxed at rest, the end of leash  45  is not completely up inside the end of the tube extension  44 . Those skilled in the art will appreciate that how the tube  44  is attached to the hand grip  41  and/or whether the tube extension  44  is clear, translucent, or a material that changes phases between clear and translucent, is not a primary contributor to the functional features of the subject invention. Those skilled in the art will also appreciate that the type of bulb in the light and/or the form of power for the light is not the primary contributor for the subject invention. A light  48  will shine and illuminate tube extension  44 , acting as a visual indicator and awareness of the person and/or the animal. The light will further shine out the end of the tube acting as a small spotlight and/or flashlight to illuminate the path in front of the person to provide a measure of safety. 
     Referring to  FIG. 20 , the leash embodiment of  FIG. 18  is shown demonstrating lateral flexibility of the tube  44  able to flex laterally in a rotational 360 degree sweep in response to elongation forces applied transverse to the tube&#39;s axis. For clarity and simplicity, positions  48  and  49  represent two positions at which the tube  44  is able to flex as it responds to lateral and/or transverse forces. 
     Referring to  FIG. 21 , a leash  49  embodiment is shown in which a hand grip  50  is disposed between wrist loop  51  and a retractable tether mechanism  52  with tube  57 . Leash  58  extends out of the end of tube  57  such that the end of leash  58  is not completely up inside the end of the tube  57 . Those skilled in the art will appreciate that how the tube  57  is attached to the retractable mechanism housing  52  and how housing  52  is attached to hand grip  50  and/or whether the tube  57  is clear, translucent, solid, or a material that changes phases between clear and opaque, is not a primary contributor to the functional features of the subject invention. Mechanical housing  52  includes buttons  53 ,  54 , and  55  for the purposes of retracting the leash, establishing a brake for the leash, and controlling a light  56 . The subject invention provides a resilient element and assembly housed inside the hand grip  50 . 
     Referring to  FIG. 22 , an embodiment of a leash product is shown comprised of a wrist loop  51 , a telescopic hand grip assembly comprised of outer housing  60  and inner sleeve  59 , a retractable mechanism  52 , and a leash  58 . Retractable housing  52  includes at least one control button  53  and is attached to the hand grip assembly. Outer housing  60  is attached to retractable housing  52  and an inner sleeve  59  is attached to wrist loop  51 . Inner sleeve  59  is closed off adjacent to the wrist loop  51  except for an opening for the wrist loop to pass through. Retaining devices  63  straddle both sides of the closed end of inner sleeve  59  and prevent wrist loop  51  from excessive axial translation relative to the hand grip assembly. Serpentine  61  and resilient element  62  provide an elongation means for strap  67  housed inside of inner sleeve  59 . Strap  67  is attached to retractable housing  52 . 
     Referring to  FIG. 23 , an embodiment of a leash product is shown comprised of a wrist loop  51 , a telescopic hand grip assembly  62 , a retractable mechanism  52 , and a leash strap  49 . Leash  49  includes hand grip  50 . Retractable housing  51  includes at least one control button  53  and is attached to hand grip assembly  55 . Hand grip assembly is comprised of an outer sleeve  64  which is attached to wrist loop  51  and an inner sleeve  65  which is attached to retractable housing  52 . Outer sleeve  64  is closed off at one end adjacent to the wrist loop  51  except for an opening for the wrist loop to pass through. The closed end of housing  64  and serpentine  61  prevent wrist loop  51  from excessive axial translation relative to the hand grip assembly. Serpentine  61  and resilient element  62  provide an elongation means for strap  67  housed inside of inner sleeve  65 . Strap  67  is attached to retractable housing  52 . 
     Referring to  FIG. 24 , the leash embodiment from  FIG. 23  is modified to include a tube  57 . The flexible leash  58  includes strap restrictor device  65 . Restrictor  65  can be a washer, knot, or some kind of device that is larger than the hole in the tube  57  and therefore prevents retraction housing  52  from being able to retract leash  58  and clasp  68  into the tube. Some combinations of clasp  68  compared to the hole in tube  57  may be sufficient in and of themselves to allow clasp  68  to function as both a clasp and a restrictor device. 
     Referring to  FIG. 25 , a tether portion  69  is assembled with a tubular formed resilient element  71  to form serpentine  70 . The ends of resilient element  71  are terminated and restrained using a wrap device  72  such as a wire tie or other typical wrapping method. 
     Referring to  FIG. 26 , tether portion  69  is assembled with resilient element  71  to form serpentine  70 . Resilient element  71  is shown to be a hollow tube with an opening  73  at each end. The end of tubular resilient element  71  can be expanded to receive insert  76  which creates a bulge that can snug into the flared opening of tunnel  74  but is too large to pass through the secured portion of tunnel  74 . Tunnel  74  is attached to tether  69  such that it effectively restrains the terminated ends of tubular resilient element  71 . The middle portion of tunnel  74  is fixed to tether  69 , while the openings to the tunnel are flared to prevent stress concentration areas on tubular resilient element  71  during repeated elongation cycles. 
     Referring to  FIG. 27 , tether portion  69  is assembled with resilient element  71  to form serpentine  70 . Resilient element  71  is shown to be a hollow tube with an opening  73  at each end. The end of tubular resilient element  71  can be expanded to receive insert  76  which creates a bulge that can be received by the large opening of truncated funnel  77  but is too large to pass through the small opening of truncated funnel  77 . Truncated funnel  77  is attached to tether  69  such that it effectively restrains the terminated ends of tubular resilient element  71 . 
     Referring to  FIG. 28 , tether portion  69  is assembled with resilient element  71  to form serpentine  70 . Resilient element  71  is shown to be a hollow tube with an opening  73  at each end. The end of tubular resilient element  71  can be expanded to receive insert  76  which creates a bulge that is too large to pass through the opening of tunnel  78 . Tunnel  78  is attached to tether  69  such that it effectively restrains the terminated ends of tubular resilient element  71 . In this embodiment the entire length of tunnel  78  is fixed to tether  69 . 
     Referring to  FIG. 29 , an embodiment of the subject invention is applied to a towing strap  80  for the typical purpose of connecting between two vehicles whereby one vehicle pulls another vehicle via the towing strap  80  disposed between the two vehicles. One problem with prior towing straps is that towing motion does not occur until the moment that the towing strap becomes stretched tight between the two vehicles, at which point a hard taut jerk is experienced which can cause damage to the vehicles, injury to the drivers, and/or lost confidence that the vehicles are under control. The subject invention addresses this problem and overcomes it by providing a resilient element incorporated into the towing strap. Hooks  79  are connected to each vehicle. Serpentine  81  contains at least one resilient element  82  and may include multiple resilient elements  82  to match towing ratings of a specific towing strap. 
     Referring to  FIG. 30 , the towing strap from  FIG. 29  is shown in elongated position. 
     Referring to  FIG. 31 , an embodiment of the subject invention is applied to a towing strap link for the typical purpose of connecting between two vehicles whereby one vehicle pulls another vehicle using a typical prior towing strap or towing chain disposed between the two vehicles. One problem with prior towing straps and towing chains is that towing motion does not occur until the moment that the towing strap becomes stretched tight between the two vehicles, at which point a hard taut jerk is experienced which can cause damage to the vehicles, injury to the drivers, and/or lost confidence that the vehicles are under control. The subject invention addresses this problem and overcomes it by providing a resilient element incorporated into the towing strap link  84  which can be used in conjunction with prior towing straps and chains to essentially upgrade them with improved features of the subject invention. In use, a prior towing strap or chain is connected to one vehicle and the other end of the prior towing strap or chain is connected to the subject invention at one hook  83 . The other hook  83  is connected to the other vehicle. Serpentine  85  contains at least one resilient element  86  and may include multiple resilient elements  86  to match towing ratings of a specific towing strap. 
     Referring to  FIG. 32 , the towing strap link  84  from  FIG. 31  is shown in an elongated position. 
     Referring to  FIG. 33 , a relatively heavy duty resilient element  87  is shown. 
     Referring to  FIG. 34 , a relatively light duty resilient element  88  is shown. 
     Referring to  FIG. 35 , an embodiment of the subject invention is applied to a leash  91  in which the leash includes a relatively light duty resilient element  88  with corresponding serpentine  90  and also a relatively heavy duty resilient element  87  with corresponding serpentine  89 . 
     Referring to  FIG. 36 , a profile view of an alternative leash embodiment  92  of the subject invention utilizes resilient elements  93 ,  94 , and  95  in shapes similar to O-rings. The O-rings may be all of the same relative size or as shown in  FIG. 36  in which they are of different sizes and/or load responses. In this view, displacement limiter  96  is not shown for clarity. 
     Referring to  FIG. 37 , a plan view is shown of the leash  92  from  FIG. 36  which in this view displacement limiter  96  can be seen for the purposes of limiting the displacement of the resilient elements so that they cannot reach their tensile break point before the displacement limiter  96  reaches a relative taut position. 
     Referring to  FIG. 38 , leash  92  from  FIG. 37  is shown in an elongated position. 
     Referring to  FIG. 39 , an embodiment of the subject invention is applied to a towing hitch assembly  97 , similar to a Reese brand hitch system. A typical hitch system  97  of the preferred embodiment may include a locking pin  98  and spring pin  99  to retain sleeve  107 . Sleeve  107  houses inside telescopic sleeve  106 , resilient element  103 , and serpentine  102 . One end of serpentine strap  102  is connected to pin assembly  100 - 101  by strap joint  104  and the other end is connected to hitch loop  108  by strap joint components  105 . 
     Referring to  FIG. 40 , an embodiment of a leash application includes a hand grip  110  disposed between wrist loop  109  and retraction housing  113 . Control buttons  112  and  113  provide a tension control for the strap  116  and a strap locking feature. Serpentine  114  and resilient element  115  are located so that they provide shock absorption and also serve a strap retraction restrictor, which prevents the entire leash  116  from being retracted in the housing  113 . 
     Referring to  FIG. 41 , a leash application  119  is shown with an enlargement view of resilient element  117  and serpentine assembly  118  used with a horse connected on one end and held on the other end by a person. 
     Referring to  FIG. 42 , a leash application  141  is shown with an enlargement view of resilient element  122  and serpentine  121  used with a large animal such as a large dog connected on one end at a typical prior collar  123  and held on the other end by a person. 
     Referring to  FIG. 43 , a child restraint tether application  124  is shown connected to a child wearing a typical harness of belt  127  and held by a person. An enlargement view of tether  124  shows serpentine  125  and resilient element assembly  126 . 
     Referring to  FIG. 44 , a sport tether application  128  is used in skiing connected to a boat on one end and held by a person on the other end. An enlargement of a portion of  128  shows serpentine  129  and resilient element  130 . 
     Referring to  FIG. 45 , a sport hunting safety restraint tether application  131  is connected to typical elevated tower  135  on one end and connected to a typical safety harness  132  worn by a person. Enlargement view of tether  131  shows resilient element  133  and serpentine  134 . In the event that the person falls off the platform of tower  135 , prior safety devices will prevent the person from falling all the way to the ground, which can cause serious injury and/or death. However, one problem with prior systems is that, at the very moment that the person&#39;s weight extends the safety tether to maximum, there is a hard taut jerk and stop, which is less injurious than the full fall to the ground, but nonetheless injurious in and of itself. The subject invention addresses and overcomes this problem by providing an appropriate shock absorber system in the resilient element  133  and serpentine  134 . 
     Referring to  FIG. 46 , a leash application is shown wherein leash  136  includes an enlargement view showing resilient element  138  and serpentine  137  attached to a traditional prior choke collar  139 . The application of the subject invention in combination with the prior choke collar essentially upgrades the prior choke collar to a more humane device than it can be by itself without the subject invention. 
     Referring to  FIG. 47 , a standard prior leash  140  and a standard prior choke collar  139  are shown wherein a preferred embodiment link application of the subject invention leash  141  includes an enlargement view showing resilient element  143  and serpentine  142 . Leash  141  connects to the choke collar on one end with clasp  144  and is attached to the leash via ring  145 . The application of the subject invention in combination with the prior choke collar and the standard leash essentially upgrades the prior choke collar and leash to more humane and effective devices than they can be by themselves without the subject invention. 
     Referring to  FIG. 48 , a leash of the subject invention  146  includes a resilient element and a serpentine housed within a flexible sleeve  147 . The flexible sleeve  147  can be a fabric or collapsible material or other stretchy material providing suitable expansion and at the same time protection from incidental damage as the resilient element extends to follow the displacement of the resilient element during use. 
     Referring to  FIG. 49 , the leash from  FIG. 48  is shown in an elongated position. 
     Referring to  FIG. 50 , an embodiment of the subject invention  148  is applied to a standard prior halter  152  such as is used for a horse or other large animal wherein the serpentine  149  and resilient element  150  are shown in an enlarged view and are either a permanent attachment to the halter  152  and/or the resilient element  148  is embedded in the strap construction of the halter. Any rope or leash or tether device  151  can be attached to the improved halter system which essentially upgrades the rope or tether with the advantages of the subject invention. A useful feature of the subject invention is that, if the resilient element  148  is embedded in the tether device  151  construction, then the resilient element  148  will not be dangling from the halter  152 . In similar fashion, another feature of the subject invention applies if the serpentine  149  and resilient element  150  are a link style attachment to the halter  152 , wherein the dangling end can be simply attached to another part of the halter  152  to eliminate the dangling portion when not in use with a leash or tether device  151 . 
     Referring to  FIG. 51 , an alternate embodiment of the subject invention is shown wherein resilient element  156  is weaved through the holes formed by the links of chain  154  and retained in place by T-shaped ends  155 . In this particular application, the chain  154  is part of the construction of a typical standard dog choke collar. Those skilled in the art will appreciate that this concept is not limited to the type of chain, size of chain, shape of links, material of the links, or even the particular application of the chain, whether it be a leash for an animal, a vehicle tow chain, a safety harness chain, et cetera. 
     Referring to  FIG. 52A , a preferred embodiment  157  of the subject invention is shown wherein more than one resilient element assembly is positioned under protective covers  158  and  159 . This embodiment includes a sliding hand grip  163  with sliding adjustment limited by assembly  158  and stop tabs  162 . A first wrist loop  161  is provided at one end of the leash and a second wrist loop  160  is provided near the other end of the leash to provide close control of the animal. Elastic strap  164  is provided to bundle the entire product for storage. Those skilled in the art will appreciate that the actual length of strap or tether is not a critical feature of the product, nor whether the tether includes a length adjustment means to accommodate various leash lengths. Those skilled in the art will also appreciate that various protective cover methods readily exist for bundling and storing the product when not in use. 
     Referring to  FIG. 52B , an example is shown of a preferred embodiment of a dog pull toy  165  comprised of a hand grip  166  and resilient assembly in a cover  167  and a chew ring  170  retained by a strap  168 . An alternate chew toy  171  is replaceable in retaining strap  168 . The pull toy also features an optional pocket  169  wherein an item such as an olfactory treat or an audible training item can be deposited to entice the pet to play and/or train with the pull toy and then removed at the discretion of the user as a reward. Chew toy  171  is also shown with an optional pocket  172  for receiving an audible and/or olfactory item. Professional dog trainers can use pockets like  169  to train dogs for certain smells for search and rescue and other specialized training. By combining the treat delivery pocket  169  with a force-displacement device in cover  167  this preferred embodiment of the subject invention provides training and recreation benefits not possible with prior training devices or prior pull toys. 
     Referring to  FIG. 53 , an embodiment of the subject invention is shown that presents a variation on the theme wherein the resilient element  175  does not pass through holes in tether  173 . Resilient element  175  is attached to tether  173  at both ends, such as  177 . In a relaxed position, resilient element  175  causes tether  173  to bundle up, represented by serpentine portion  174 . Bundled serpentine portion  174  provides a displacement limiter preventing resilient element  175  from elongating past the tensile break point of the resilient material. The geometry of resilient element  175  includes radii  176  that easily straighten out to provide relatively long displacement length at relatively low force loads, and then transition into relatively short displacement length at relatively high force loads as resilient element  175  begins to actually stretch and elongate. 
     Referring to  FIG. 54 , the embodiment of  FIG. 53  is shown in an elongated position. 
     Referring to  FIG. 55 , an embodiment of the subject invention is shown wherein gun  178  has shoulder strap  181  with a portion of the strap assembled with a resilient element  180  and a serpentine  179 . 
     Referring to  FIG. 56 , an embodiment of the subject invention is shown wherein a dog harness  186  has an integral assembly  187  containing serpentine  183 , resilient element  184 , and attachment ring  185 . A tether device  182  attaches at ring  185 . 
     Referring to  FIG. 57 , an embodiment of the subject invention is shown wherein a martingale style collar  189  has been improved with resilient elements and serpentines  191  in a short strap portion  193  which is free to slide through rings  190 . A tether device  188  attaches at ring  192 . 
     Referring to  FIG. 58 , Chart  1  depicts known resilient devices and springs all having a characteristic force-displacement relationship that is basically linear in nature, meaning that for any given change in force there is a corresponding displacement response which, when graphed, represents a relatively linear line slope. Chart  1  shows one such linear relationship typical of resilient and spring type elements. The slope of the linear relationship may be different than the one shown in Chart  1 , depending upon the physical properties of the resilient element, but it will still be relatively linear. 
     Referring to  FIG. 59 , the subject invention provides a resilient device in which there is a more complex relationship between force and displacement that is not a typical linear relationship. Chart  2  shows one such complex force-displacement relationship wherein there is an initial light duty load response that transitions into a medium duty load response and that finally transitions into a heavy duty load response. The initial light duty load results in a force-displacement wherein relatively low force is required to displace a relatively long displacement distance. The final heavy duty load results in a relatively high force required to displace a relatively short displacement distance. A transition exists between them providing a relatively median force required displacing a relatively median displacement distance. 
     This complex force-displacement relationship is accomplished by combining the physical properties of a resilient element to cooperate with geometric shapes so as to augment an assembled structure into a deliberately and specifically complex force-displacement relationship to accomplish improved functions and/or performance not possible with an assembly structure utilizing a simple linear force-displacement relationship. The subject invention combines the geometric shape of various tethering devices with the physical properties of a resilient element to accomplish this complex force-displacement relationship. Several variations on the theme and numerous applications and/or uses of the subject invention are described in detail in the preceding figures, from which the features and benefits of the subject invention will become self apparent. 
     In each case of the preferred embodiments wherein a tethering device is assembled such that a portion of the tether is formed into a serpentine with the resilient element passing through a series of holes in the tether, the serpentine is free to initially straighten out as the resilient element is elongated in response to force-displacement action. The resulting force-displacement that occurs is relatively light duty force combined with relatively long displacement, as shown in Chart  2 . If displacement continues, at some point the tether will reach a full taut straight position. However, before the tether has achieved full straight position, the geometric shape of the serpentines in the tether will impinge upon the resilient element increasing the force required to continue displacement, resulting in relatively heavy duty force required to displace a relatively short distance. As Chart  2  shows, there is a transition zone between the light duty force-displacement and the heavy duty force-displacement zones. This transition zone is where the geometry of the serpentines begins to impinge upon the resilient element and when the serpentines are fully engaged in contact with the resilient element. 
     Those skilled in the art will readily appreciate that this transition zone can be adjusted and/or designed for specific applications by changing the relative fit of the holes in the tether and the size of the resilient element passing through the holes. In addition, those skilled in the art will appreciate that the number of serpentines and the relative magnitude of the sine wave pattern of the serpentine also has a profound impact upon the performance of the assembly. In other words, a looser sine wave serpentine pattern will allow for increased length of displacement during the light duty force-displacement while, by comparison, a tighter sine wave serpentine pattern will limit the length of the light duty force-displacement. Thusly, each zone of the complex force-displacement response of the assembly of the subject invention can be tuned and/or designed to meet specific application requirements. 
     While most of the preferred embodiments shown in the figures display just two zones of force-displacement with one transition zone between them, those skilled in the art will appreciate that the subject invention can be designed to have three or more zones of force-displacement, each with a corresponding transition zone between each one.  FIG. 10  and  FIG. 12  represent examples of the preferred embodiment wherein multiple zones of force-deflection are designed into the resilient element itself, while  FIG. 35  and  FIG. 37  represent an example of the preferred embodiment wherein at least two different strength resilient elements and corresponding serpentine assemblies are resident in the product to provide different zones of force-deflection performance. 
     Many of the embodiments of the subject invention shown combine the geometry of a serpentine portion of the tether with the physical properties of the resilient element to create the complex force-displacement response with multiple zones of response. A variation of this application of the subject invention is shown in  FIG. 51  wherein the physical properties of the resilient element are combined with the geometry of the collapsing links of chain, wherein the holes in the links of the chain impinge upon the resilient element as the chain portion is straightened out to full length. 
     Yet another variation on the theme of the subject invention is shown in  FIG. 37  and  FIG. 53  wherein the combination of specific geometry of the resilient element combined with the physical properties of the same resilient element serve to establish the complex multi-zone force-displacement response. Both of these embodiments use the geometry of the radii of the resilient element to provide light duty displacement as the resilient element straightens out in response to displacement force and then transitions into heavy duty displacement as the resilient element actually begins to stretch. 
     It will be readily apparent to those skilled in the art that the embodiments and applications shown in this disclosure are not intended to be exhaustive, but rather represent only a portion of potential applications that can benefit from the advantages of the subject invention. 
     The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.