the present invention provides an attachment for a shoe , boot , etc . of the kicking foot of a rider of a kick scooter to facilitate propelling the kick scooter , skateboard , or similar device while minimizing the bending of the stationary leg of the rider during kicking strokes . referring first to fig1 , there is shown a perspective , schematic view of a typical kick scooter showing a portion of a rider having a kicking shoe attachment in accordance with the invention attached to his / her kicking foot , generally at reference number 300 . a typical kick scooter 302 forms no part of the present invention and is shown only to illustrate the intended operating environment of the kicking shoe attachment of the invention . kick scooter 302 has a deck 304 comprising a flat surface for receiving the stationary foot 306 of a rider 308 . rider 308 also forms no part of the present invention . the upper surface of deck 304 is disposed at a height “ h ” 310 above the surface of the pavement or other surface 316 upon which the kick scooter 302 is being ridden . a representative kicking shoe attachment 100 b is shown on kicking foot 314 of rider 308 . several embodiments of a kicking shoe attachment are disclosed hereinbelow and any of the disclosed embodiments may be substitutes for kicking shoe attachment 100 b shown in fig1 . kicking shoe attachment 100 b has a height ( i . e ., vertical thickness ) h ′ 312 . height h ′ 312 is either approximately equal to or less than height h 310 . when heights h 310 and h ′ 312 are equal , bending of the stationary leg of a rider during a kicking stroke is minimized . if height h ′ 312 of the kicking shoe attachment 100 b is less than deck height h 310 , more bending of the knee of the rider &# 39 ; s stationary leg will be required during kicking strokes . however , more powerful kicking strokes may possibly be produced when the rider is in “ sporting ” riding mode where such more powerful strokes are probably beneficial . referring now also to fig2 a , and 3a there are shown side elevational and top plan schematic views , respectively , of first embodiment of a kicking shoe attachment in accordance with the invention , generally at reference number 100 a . a solid main body core 102 has a substantially flat upper surface 104 , and a convex lower surface 106 . in this embodiment , main body core 102 is formed from a solid piece of sturdy , lightweight material . such lightweight , sturdy materials include lightweight metals such as aluminum and polymers such as abs . it will be recognized that numerous other lightweight , sturdy materials may be known to those of skill in the art and , consequently , the invention is not limited by the material examples chosen for purposes of disclosure . rather , the invention is intended to include any suitable main body core 102 material . an upper sole 108 is fastened to the upper surface 104 of main body core 102 . upper sole 108 is typically formed from rubber , either natural or artificial , or from another polymeric elastomer . upper sole 108 is ideally formed from a non - slip material upon which the shoe of a rider of the device being used with kicking attachment 100 a rests . further , the invention is not intended to be limited to the upper sole 108 material chosen for purposes of disclosure . rather , the invention is intended to include any suitable upper sole 108 material . a lower sole 110 is fastened to a lower , convex , curvilinear surface 106 of main body core 102 . lower sole 110 is formed from a wear resistant material designed to wear well as lower sole 110 is kicked against the horizontal surface on which the kick scooter , etc . is being propelled by a rider thereof . further , the invention is not intended to be limited to the lower sole 110 material chosen for purposes of disclosure . rather , the invention is intended to include any suitable lower sole 110 material . it will be further recognized by those of skill in the art that lower sole 110 may be attached to lower , convex , curvilinear surface 106 in a manner that facilitates its replacement when worn or damaged . device and / or methods for replaceably fastening lower sole 110 to lower surface 106 are believed to be well known to those of skill in the art and , consequently such devices and / or methods are not further discussed herein . a front retaining strap 114 or similar structure is disposed forward on upper sole 108 . front retaining strap 114 is adapted to adjustably and securely retain the toe region of the rider &# 39 ; s shoe against upper sole 108 . a hook - and - loop fastening system is typically utilized to provide the adjustability required for the application . the hook - and - loop fastening system has a first portion 120 of either hook or loop material and second portion 122 formed from the opposite one of hook or loop material , disposed on surfaces of front retaining strap 114 in ways believed to be well known to those of skill in the art . a heel receiving space 112 is provided to accept a protruding heel attached to the sole of footwear , typically women &# 39 ; s footwear . heel receiving space 112 typically is configured as an elongated groove . referring now also to fig2 b , there is shown a side elevational , schematic view of first embodiment of a kicking shoe attachment in accordance with the invention , generally at reference number 100 b . kicking shoe attachment 102 b has a solid main body core 102 having a substantially flat upper surface 104 , and a convex lower surface 106 identical to kicking shoe attachment 100 a of fig2 a . an upper sole 108 is fastened to the upper surface 104 of main body core 102 . upper sole 108 is typically formed from rubber , either natural or artificial , or from another polymeric elastomer . upper sole 108 is ideally formed from a non - slip material upon which the stationary shoe of a rider of the device being used with kicking attachment 100 b rests . further , the invention is not intended to be limited to the upper sole 108 material chosen for purposes of disclosure . rather , the invention is intended to include any suitable upper sole 108 material . a lower sole 110 is fastened to a lower , convex , curvilinear surface 106 of main body core 102 . lower sole 110 is formed from a wear resistant material designed to wear well as lower sole 110 is kicked against the horizontal surface on which the kick scooter , etc . is being propelled by a rider thereof . further , the invention is not intended to be limited to the lower sole 110 material chosen for purposes of disclosure . rather , the invention is intended to include any suitable lower sole 110 material . it will be further recognized by those of skill in the art that lower sole 110 may be attached to lower , convex , curvilinear surface 106 in a manner that facilitates its replacement when worn or damaged . device and / or methods for replaceably fastening lower sole 110 to lower surface 106 are believed to be well known to those of skill in the art and , consequently such devices and / or methods are not further discussed herein . a front retaining strap 114 or similar structure is disposed forward on upper sole 108 . front retaining strap 114 is adapted to adjustably and securely retain the toe region of the rider &# 39 ; s shoe against upper sole 108 . a hook - and - loop fastening system is typically utilized to provide the adjustability required for the application . the hook - and - loop fastening system has a first portion 120 of either hook or loop material and second portion 122 formed from the opposite one of hook or loop material , disposed on surfaces of front retaining strap 114 in ways believed to be well known to those of skill in the art . in alternate embodiments , one or more snap fasteners 116 may be used to secure front retaining strap 114 . a heel retaining cup 118 is attached at its lower edge to an upper surface , not specifically identified , of a heel cup carrier plate 134 . heel cup carrier plate 134 is slidably retained on upper sole 108 by heel cup carrier plate receiver 136 , best seen on fig3 d , proximate a rear edge thereof . heel cup carrier plate 134 is slidably secured to heel cup carrier plate receiver 136 that is , in turn , secures to upper sole 108 and / or upper surface 104 of main body 102 . the sliding attachment of heel cup carrier plate 134 to heel cup carrier plate receiver 136 allows forward and backward movement of heel cup 118 , thereby accommodating shoes of different sizes to be securely attached to the kicking shoe attachment . in alternate embodiments , the function of heel cup carrier plate receiver 136 may be replaced by horizontal grooves , not shown , in main body 102 . these grooves are disposed in opposing sides of main body 102 proximate upper surface 104 . the grooves are disposed and configured to receive and retain heel cup carrier plate 134 as seen in fig3 d . a substantially circular opening in heel cup carrier plate 134 and an elongated opening in upper sole 108 provide access to a hollow heel receiving space 112 formed in solid body core 102 . heel receiving space 112 is provided to accept a protruding heel attached to the sole of footwear , typically women &# 39 ; s footwear . heel receiving space 112 typically is an elongated groove . the combination of elongated main body core 102 , upper sole 108 , and lower sole 110 has a height 124 corresponding to height h ′ 312 of fig1 . referring now also to fig3 a , there are shown top plan , schematic views of the kicking shoe attachment of fig2 a . no heel cup 118 ( fig3 b - 3d ) is present in this embodiment . referring now also to fig3 b and 3c , there are shown top plan , schematic views of the kicking shoe attachment of fig2 b . in fig3 b , heel cup 118 is shown in its rear - most position while in fig3 c , heel cup 118 is shown in its most forward position . as may readily be seen , main body core 102 has an elongated , ovulate shape corresponding roughly to the outline of a shoe or boot . front retaining strap 114 or similar structure disposed forward on upper sole 108 , may be replaced with numerous other footwear retention mechanisms believed to be well known to those of skill in the art . one such well - known , useful replacement could be a quick release binding mechanism , not shown , commonly used on skis , skateboards , etc . referring now also to fig3 d , there is shown a front enlarged cross - sectional view a - a . heel cup 118 , heel cup carrier plate 134 and heel cup carrier plate receiver 136 may readily be seen . in addition , a latching mechanism that maintains heel cup 118 and heel cup carrier plate 134 in a desired position . the latching mechanism consists of a depressible button 144 having a button lip 138 in a button well 148 . a spring 146 maintains upward pressure on a lower surface , not specifically identified , of button lip 139 and the button 144 so as to hold button 144 in a selected one of openings 142 , best seen in fig3 b and 3c . referring now also to fig4 a and 4b , there are shown top plan and side elevational , schematic drawings of a first embodiment of a plug 150 a for insertion in substantially circular hole 138 of heel cup carrier plate 134 . plug 150 a has a substantially circular cross - section and a substantially flat upper surface 151 . a pair of finger recesses 152 is formed in upper surface 151 on either side of central region 153 . plug 150 a has at least one side vertical wall having a taper 154 . referring now also to fig4 c , 4d and 4e , there are shown a top plan , a first vertical cross - sectional and a second vertical cross - sectional , schematic view , respectively , of a second embodiment of a plug , generally at reference number 150 b . plug 150 b has a substantially flat upper surface 151 with a single finger recess 158 and a pivotable handle 156 disposed therein . pivotable handle 156 is movable from a flat , stored orientation as shown in fig4 c and 4d . in its flat , stored orientation , pivotable handle 156 lies substantially flush with upper surface 151 . pivotable handle 156 may be raised to a vertical , operable orientation as shown in fig4 e . when in its vertical , operable orientation , handle 156 may be used to facilitate extraction of plug 150 b from substantially circular opening 138 138 in heel cup carrier plate 134 . it will be further recognized that main body core 102 may alternatively be formed by laminated layers . referring now also to fig5 , there is shown a side elevational , schematic view of a kicking shoe attachment having such an elongated main body core construction . main body core 102 as shown in fig2 is replaced by a laminated body core 130 comprising a plurality of layers 132 a , 132 b . . . 132 n . layers 132 a , 132 b . . . 132 n may be formed from a single material such as wood , plastic , rubber , etc . in alternate embodiments , layers 132 a , 132 b . . . 132 n may be formed from two or more different materials . in one possible construction , layers of cork may be interspersed among layers of wood , rubber , or plastic , etc . to provide a cushioning ( e . g ., damping or shock absorbing ) effect for the kicking foot , not shown . elongated main body core 102 lends itself well to formation by traditional laminating processes wherein successive vertical layers are adhesively bonded to one another referring now also to fig6 , there is shown a side elevational , schematic view of a second embodiment of the kicking shoe attachment with springs within the elongated main body , generally at reference number 180 . in the kicking shoe attachment 180 elongated main body core 102 of kicking shoe attachment 100 b is split into two portions ; an upper body portion 182 and a lower body portion 184 . the combined thickness of upper body portion 182 and lower body portion 184 is smaller than the thickness of solid main body core 102 . coil springs 186 are interposed between a lower surface of upper body portion 182 and an upper surface of lower body portion 184 . springs 186 are typically coil springs having sufficient stiffness to maintain connective integrity between upper body portion 182 and lower body portion 184 while providing a kicking assist to the rider of a kick scooter . while coil springs 186 are shown for purposes of disclosure , it will be recognized by those of skill in the art that springs of other types , for example , leaf springs , may readily be substituted for coil springs 186 . consequently , the invention is not considered limited to the coil springs chosen for purposes of disclosure . rather , the invention is intended to include any and all other suitable forms of springs . referring now also to fig7 , there is shown a side elevational , schematic view of a third embodiment of the kicking shoe attachment with resilient material within the body generally at reference number 200 . in kicking shoe attachment 200 , springs 186 ( fig6 ) are replaced by a block of a resilient material 202 . materials such as polyurethanes , latex , or polyether urethanes ( eu ) elastomeric foam have been found suitable for the application . it will be recognized by those of skill in that art that suitable other material may be available . consequently , the invention is not considered limited to the materials chosen for purposes of disclosure . it is anticipated that kicking shoe attachment 200 is less expensive to manufacture while still providing the kicking assist benefits of kicking shoe attachment 180 . resilient material 202 may readily be adhesively attached to a lower surface of upper body portion 182 and an upper surface of lower body portion 184 . referring now also to fig8 , there is shown a side elevational , schematic view of a fourth embodiment of the kicking shoe attachment with a one piece body generally at reference number 250 . kicking shoe attachment 250 is nearly the same as kicking shoe attachment 100 b with the exception that solid main body core 102 is replaced with a main body 252 that has a plurality of through holes 254 from side to side . through holes 254 are provided to reduce the weight of kicking shoe attachment 250 and enhance cushioning to body 252 in cases where body 252 is formed from an elastic material while maintaining the necessary height and structural integrity . while through holes 254 are shown in a regular pattern for purposes of disclosure , it may be desirable to arrange through holes 254 in a more random pattern for structural purposes . referring now also to fig9 , there is shown the kicking shoe attachment of fig2 with an attached tether 260 . tether 260 is securely anchored in elongated main body core 102 and extends outwardly therefrom . a locking apparatus , not shown , may be used to attach tether 260 to elongated main body core 102 . a locking device useful for securing kicking shoe attachment to an environmental structure is shown schematically at reference number 262 at a distal end , not specifically identified , of tether 260 . locking device 262 may alternately be attached to kicking shoe attachment 100 a , 100 b to prevent dangling of teacher 260 when the kick scooter is being ridden . referring now also to fig1 , there is shown a side elevational , schematic view of yet another embodiment of the kicking shoe attachment , generally at reference number 300 . kicking shoe attachment 300 incorporates a height adjusting mechanism 282 that allows a user to adapt kicking shoe attachment 300 for use with multiple kick scooters having varying deck heights h 310 ( fig1 ). in addition , as the soles of footwear to which kicking shoe attachment 300 may be attached may vary significantly , height adjustment mechanism 282 may be used to “ tweak ” the height h ′ 312 of fig1 for optimum kicking performance , especially minimum bending of the stationary leg of the rider . height adjusting mechanism 282 is a scissor jack mechanism wherein a lead screw 288 may be rotated by applying a crank or the like to eye 290 . lead screw passes through a pair of captive nuts , not shown at each end of a pair of scissor arms , not specifically identified . scissor jack mechanisms are believed to be well known to those of skill in the art . consequently , the more exact details on height adjusting mechanism 282 are not provided herein . it will be readily apparent to those of skill in the art that any variation of scissor jack mechanism may be adapted for use with kicking shoe attachment 300 . it will be further apparent to one of skill in the art that other styles of similar devices may be substituted for scissor jack 282 . consequently , the novel kicking shoe attachment is not considered limited to the scissor jack used for purposes of disclosure . rather , any suitable height - adjusting mechanism may be substituted . height - adjusting mechanism readily allows a rider to adjust his / her kicking shoe attachment to an optimum height for the style of riding ( i . e ., casual or “ sporting ”) the rider anticipates . one or more stabilizing structures may be added , if required , to maintain vertical alignment of core portions 182 and 184 . it will be recognized that alternate embodiments of kicking shoe attachment may be configured for attachment only to the toe end of a rider &# 39 ; s footwear . one possible way to retain such an embodiment of a kicking shoe attachment is using an adjustable - width toe clamp similar to such clamps used on clamp - on roller skates . such clamps are typically fastened in place by a so - called skate key that tightens or loosens the toe clamps . since other modifications and changes varied to fit particular operating requirements and environments will be apparent to those skilled in the art , the invention is not considered limited to the example chosen for purposes of disclosure , and covers all changes and modifications which do not constitute departures from the true spirit and scope of this invention . having thus described the invention , what is desired to be protected by letters patent is presented in the subsequently appended claims .
a kicking shoe attachment for use by the rider of a kick scooter having an elongated core with a flat upper surface with an upper sole thereupon , and an opposing curvilinear lower surface with a wear resistant lower sole disposed thereupon . optionally a heel cup connected to a heel cup carrier plate is slidably supported in a heel cup carrier plate receiver . a latching mechanism allows securing the heel cup and carrier plate in a desired position along a major axis of the elongated core . the elongated core may be split apart horizontally and two or more springs , a block of a resilient material or a scissor jack mechanism may be placed between the portions . an opening may be placed in the upper surface of the elongated body to receive the protruding heel of typically a woman &# 39 ; s heeled shoe or boot . a removable plug may fill the hole when unneeded .