as depicted in fig1 and 3 , a fixed length leash 2 , for use with the present invention , generally comprises an elongated strap 4 having a handle 6 at one end of the strap 4 and an engagement means 8 at the other end of the strap 4 . the effective length of the leash 2 is the portion of the leash 2 extending between the user and the animal generally along a single axis . the handle 6 can comprise a loop at the end of the strap 4 that can be gripped by a person . similarly , the engagement means 8 can comprise a collar , a body or muzzle harness , or carabineer for clipping the strap 4 to a collar , body or muzzle harness . as depicted in fig1 - 5 , the leash system 10 , according to an embodiment , comprises a first clip assembly 12 , a second clip assembly 14 and a wire 16 . the first clip assembly 12 can further comprise a leash clip assembly 18 and spring - loaded spool 20 . similarly , the second clip assembly 14 can further comprise a leash clip assembly 22 and a wire clip 24 . the wire 16 can further comprise a clip assembly 28 positioned at one end of the wire 16 . the clip assembly 28 can comprise a releasable clip 30 and a rotating mechanism 32 for allowing the releasable clip 30 to rotate with the leash 2 if the leash 2 is twisted to prevent torquing of the wire 16 . as depicted in fig1 - 5 , the first clip assembly 12 is clipped to a first position on the leash 2 . as depicted , the leash clip assembly 18 is a carabineer for clipping into the loop of the handle 6 at the end of the strap 4 , but can comprise any conventional clip or conventional means for releasably mounting the first clip assembly 12 at a first position along the leash 2 . when clipped to the handle 6 , the leash clip assembly 18 can slide around the handle 6 , but cannot slide down the leash 2 . the second clip assembly 14 is mounted at a second position along the strap 4 of the leash 2 . as depicted in fig6 , the leash clip assembly 22 comprises a rectangular ring 26 that is fit over a loop formed in the strap 4 of the leash 2 . the wire clip 24 can then be fed through the loop and the rectangular ring 26 slid proximate to the wire clip 24 to fix the position of the wire clip 24 at a second position along the strap 4 . the releasable clip 30 of the wire 16 is clipped to the wire clip 24 of the second clip assembly 14 to connect the first and second clip assemblies 12 , 14 and form a loop in the strap 4 . the distance between the first and second position on the leash 2 defines the length of the loop that is ultimately formed in the strap 4 . the position of the second clip assembly 14 along the length of the strap 4 can be adjusted by the user to control the amount of slack in the effective portion of the strap 4 so as to accommodate for the height or the habits of the animal . as depicted in fig3 - 4 , the wire 16 is wrapped onto the spring - loaded spool 20 such that the wire 16 is played from the spool 20 when the leash 2 is tensioned by the movements of the animal or the person . the spool 20 is biased such that the wire 16 is wrapped onto the spool 20 when the leash 2 is not tensioned or tensioned less than a predetermined threshold such that the first and second clip assemblies 12 , 14 pulled together and the size of the loop formed in the strap 4 is increased . during operation , the tensioning of the leash 2 draws wire 16 from the spool 20 and separates the first and second clip assemblies 12 , 14 to open the loop defines in the strap 4 to increase the effective length of the leash 2 . with a fixed length leash 2 , the maximum effective length of the leash 2 corresponds to the overall length of the fixed length leash 2 . once the loop is fully open , the leash 2 bears the entirety of the pull force applied to the leash 2 . after the tension is removed , the spool 20 rewinds the wire 16 to pull the first and second clip assemblies 12 , 14 proximate to each other to reduce the effective length of the leash 2 and reform the loop in the strap 4 . as depicted in fig7 - 8 , according to an embodiment of the present invention , the first clip assembly 12 can alternatively comprise a pouch 34 for receiving the spool 20 instead of the leash clip assembly 18 . the pouch 34 defines a cavity 36 for receiving the spool 20 and having at least two openings 38 . the pouch 34 further comprises a leash strap 40 and a closeable flap 42 for covering one of the openings 38 . the leash strap 40 can comprise a fastening means 43 such that the strap 40 can be releasably wrapped around the leash 2 at the first position along the leash 2 . the fastening means 43 can comprise a velcro strap , a button , or any other conventional releasable fastening means . similarly , the closable flap 42 can comprise a fastening means 44 for retaining the spool 20 within the cavity 36 . the fastening means 46 can comprise a velcro strap , a button , or any other conventional releasable fastening means . in operation , the spool 20 is inserted into the cavity 36 such that the end of the wire 16 protrudes through one of the openings 38 in the pouch 34 and can be extended and refracted as in normal operation . as depicted in fig1 , according to an embodiment of the present invention , the second clip assembly 14 can alternatively comprise a friction mount 48 that can be selectively positioned along the length of the leash 2 . the friction mount 48 can comprise a loop portion 50 and two wing portions 52 positioned on either side of the loop portion 50 . the loop portion 50 further comprises a rounded surface 54 positioned along the top of the loop portion 50 and a clip protrusion 56 at the end of the loop portion 50 . similarly , the wing portions 52 each comprise a rounded surface 58 positioned opposite the rounded surface 54 of the loop portion 50 . in operation , a portion of the leash 2 is fed over the rounded surface 58 of one of the wing portion 52 and beneath the rounded surface 54 of the loop portion 50 before extending over the rounded surface 58 of the other wing portion 52 . the rounded surfaces 54 , 58 cooperated to define a bend in the leash 2 to help maintain the position of the friction mount 48 along the leash 2 . the friction mount 48 can be fixed in place along the leash 2 by sliding a portion of the leash 2 beneath the clip protrusion 56 such that the portion of the leash 2 is pinched between the clip protrusion 56 and the wall of the loop portion 50 . according to an embodiment , the wire clip 24 can be mounted to the friction mount 48 such that the wire 16 can be clipped to the second clip assembly 14 . according to an embodiment , the second clip assembly 14 can alternatively comprise a pin portion 60 affixable to the wire clip 24 and a pin fastener 62 . in this configuration , the pin portion 60 can puncture the leash 2 and releasably locked in place by the pin fastener 62 . the position of the second clip assembly 14 along the length of the leash 2 can be adjusted by removing the pin fastener 62 and puncturing the leash 2 at the new location . as depicted in fig9 - 14 , according to an embodiment , the leash 2 can further define a plurality of holes 64 spaced along the length of the leash 2 . the wire 16 can be threaded through the holes 64 such that the loop between the first and second clip assemblies 12 , 14 is folded along the wire 16 in an accordion shape , rather than hanging beneath the wire 16 in an open loop . in operation , when the distance between the first and second assemblies 12 , 14 is reduced , the loop formed in the leash 2 is tightly folded between the first and second assemblies 12 , 14 thereby minimizing the effective length of the leash 2 . as the first and second assemblies 12 , 14 are pulled apart ; the loop formed in the leash 2 unfolds increasing the effective length of the leash 2 . the holes 64 can be evenly spaced along the length of the leash 2 such that the wire 16 intersects the center of the folds of the leash 2 . alternatively , the holes 64 can positioned in pairs such that the folds of the leash 2 hang beneath the wire 16 . according to an embodiment , the leash 2 can further comprise a grommet 68 positioned around each of the holes 64 to prevent tearing of the holes 64 . as depicted in fig9 - 14 , the leash 2 can further comprise a secondary handle 66 positioned in front of the secondary clip assembly 14 . the secondary handle 66 can be gripped by the user to immediately restrain the animal at the minimum effective length rather than allow the animal to extend the leash to the maximum effective length . in addition , the secondary handle 66 and the handle 6 can both be gripped by the user to better restrain a larger animal . as depicted in fig1 - 21 , a leash system 70 , according to an embodiment of the present invention , comprises a leash 72 and a spool 74 . the leash 72 further comprises a handle 76 at one end and an engagement mechanism 78 at the opposite end . the engagement mechanism 78 can be secured to a collar , halter or other conventional means of securing a leash 72 to an animal . the spool 74 is positioned proximate to the handle 76 and can further comprise a wire 80 affixed to a second position along the length of the leash 72 . in one aspect , the leash 72 can further comprise a rivet 84 for securing the end of the wire 80 to the leash 72 at the second position . in operation , the spool 74 is spring - loaded to wind the wire 80 onto the spool 74 when the tension on the leash 72 is below a predetermined threshold , such as when the animal moves toward the user . in one aspect , the winding of the wire 80 onto the spool 74 forms the slacked portion of the leash 72 such that the portion of the leash 72 defining the effective length of the leash 72 remains taut . in another aspect , the leash 72 can further comprise a plurality of bore holes 82 through the leash 72 . as depicted in fig1 and 20 , in this configuration , the wire 80 is threaded through the leash 72 such that the slack portion of the leash 72 collapses into an accordion shape as the wire 80 is wound onto the spool 74 . the leash 72 can further comprise a washer 84 in each of the bore holes 82 to prevent damage to the leash 72 . as depicted in fig1 and 20 , in an embodiment of the present invention , the leash 72 can further comprise a secondary handle 86 at the second position on the leash 72 . the secondary handle 86 allows the user to rapidly shorten the maximum effective length of the leash 72 if additional control over the animal is necessary . as depicted in fig2 , a leash system 88 , according to an embodiment of the present invention , comprises the leash 72 and a spool 90 . the spool 90 is positioned proximate to a central location along the length of the leash 72 and further comprises a first wire 92 and a second wire 94 . the first wire 92 is securable to a position along the length of the leash 72 proximate to the handle 76 to define a first portion of the leash 72 that is folded into a loop or accordion shape when the first wire 92 is wound onto the spool 90 . similarly , the second wire 94 is securable to a position along the length of the leash 72 proximate to the engagement mechanism 78 of the leash 72 to define a second portion of the leash 72 that is folded into a loop or accordion shape when the second wire 94 is wound onto the spool 90 . in one aspect , the maximum length of the first wire 92 and second wire 94 is each 1 m . in operation , the spool 90 is spring - loaded to wind the first wire 92 and the second wire 94 onto the spool 90 when the tension on the leash 72 is below a predetermined threshold . winding the first wire 92 and the second wire 94 onto the spool 90 creates the first and second folded portions of the leash 72 , which are positioned on either side of the central location . in one aspect , the first and second positions can be moved inward from the ends of the leash 72 toward the central location . in this configuration , a portion of the leash proximate to either the handle 76 and / or the engagement mechanism 78 will not be folded when the first wire 92 and the second wire 94 is wound onto the spool 90 . the unfolded portions act as a buffer between the folded portions of the leash 72 and the handle 76 and the engagement mechanism 78 to avoid tangling the user or animal in the folded portions of the leash 72 . while the invention is amenable to various modifications and alternative forms , specifics thereof have been shown by way of example in the drawings and described in detail . it is understood , however , that the intention is not to limit the invention to the particular embodiments described . on the contrary , the intention is to cover all modifications , equivalents , and alternatives falling within the spirit and scope of the invention as defined by the appended claims .
a leash system for controlling the slack in the leash to prevent the animal from becoming entangled in the leash . the leash system has a spool mounted wire controlling the effective length in the leash by forming a loop in the leash to absorb any slack . if the animal pulls away from the person and additional leash length is required , wire can be automatically played out from the spool so that the loop can be opened to provide the required slack . similarly , the wire will automatically retract to reform the loop and absorb the slack the leash once the animal moves back toward the person such that the effective length of the leash remains relatively taut .