fig1 shows free throw shooter s shooting ball b along trajectory t . preferably the shot is initiated having a launch angle la substantially equal to 52 degrees and a velocity sufficient to allow the trajectory to terminate at hoop h with an entry angle ea substantially equal to 45 degrees . referring to fig1 and 2 , a first embodiment of basketball free throw training aid 10 is shown positioned on floor f below basketball hoop h which is attached to backboard bb . basketball free throw training aid 10 includes frame 11 which in turn includes base 12 mounted on a plurality of wheels 13 one or more of which may be of the locking variety so that once positioned beneath hoop h as shown , the device may be locked to prohibit movement . frame 11 also includes upright frame section 14 attached to base 12 . first frame brace 21 and as seen in fig2 , second frame brace 22 are shown stabilizing upright frame section 14 . fig2 shows first ball guide 15 and second ball guide 16 attached to frame 11 and extending from frame 11 along a plane that lies substantially perpendicular to backboard bb . as seen in fig1 , first ball guide 15 , which is typical of second ball guide 16 , extends diagonally from upright frame section 14 and is supported by first ball guide brace 25 . as seen in fig2 , second ball guide 16 is supported by second ball guide brace 26 . as seen in fig1 , an angle at which first ball guide 15 extends from upright frame section 14 may be adjusted or selected by removing screw 24 that holds first ball guide 15 with respect to first ball guide brace 25 , moving first ball guide 15 to any of a variety of angles and replacing screw 24 to secure first ball guide 15 at the selected angle with respect to first ball guide brace 25 . fig1 shows first ball guide 15 set at a preferred guide angle ga substantially equal to 45 degrees , which as previously noted is equal to the preferred entry angle ea at which ball b enters hoop h . referring again to fig2 , horizontal standard 20 is attached between the pair of spaced apart ball guides , first ball guide 15 and second ball guide 16 . fig1 shows horizontal standard 20 set at a selected elevation e above floor f and a selected distance d from backboard bb . as seen in fig1 , first ball guide 15 , which is typical of second ball guide 16 , includes first telescopic section 17 pivotably attached to upright frame section 14 at connector 19 . second telescopic section 18 is telescopically extendable from first telescopic section 17 . elevation e and distance d of horizontal standard 20 may be simultaneously increased or decreased as first and second ball guides 15 and 16 are extended or retracted . preferably , horizontal standard 20 is set at an elevation e equal to a height of hoop h plus zero to twenty - four inches . additionally , horizontal standard 20 is set at a distance d from backboard bb in the range of twenty - four inches to forty - eight inches . fig3 shows a preferred embodiment of free throw training aid 30 including frame 31 . frame 31 includes frame base 32 mounted on a plurality of wheels 33 one or more of which may be of the locking variety . frame 31 also includes upright frame section 34 attached to frame base 32 . first frame brace 35 and second frame brace 45 as seen in fig3 , stabilize upright frame section 34 . fig3 also shows ball caddy 85 suspended from a plurality of frame uprights 84 . ball caddy 85 is configured to hold a plurality of balls for storage and transport . first ball guide 60 and second ball guide 65 are shown attached to and extending from frame crossbar 53 . first ball guide 60 extends diagonally from frame crossbar 53 and is supported by first ball guide brace 50 . similarly , second ball guide 65 extends from frame crossbar 53 and is supported by second ball guide brace 55 . horizontal standard 75 is attached between the pair of spaced apart ball guides , first ball guide 60 and second ball guide 65 . fig3 also shows a pair of net support arms , first net support arm 70 and second net support arm 90 , which attach to and extend from frame crossbar 53 . ball collection net 80 is attached to the pair of net support arms 70 and 90 and first and second ball guides 60 and 65 . a lower edge of ball collection net 80 attaches to net ring 81 . ball catch 82 directs a ball that is caught within ball collection net 80 and is directed through net ring 81 onto ball return rails 83 which direct the ball back towards a shooter . fig4 shows basketball free throw training aid 30 arranged in a storage configuration wherein the device has a maximum height of seventy - nine inches and a maximum width of thirty - five inches . preferably the storage configuration should permit basketball free throw training aid 30 to be transported through a doorway having a height of eighty inches and a width of thirty - six inches . fig4 - 9 show basketball free throw training aid 30 including frame 31 . frame 31 includes frame base 32 mounted on a plurality of wheels 33 one or more of which may be of the locking variety . frame 31 also includes upright frame section 34 attached to frame base 32 . first frame brace 35 , which is typical of first frame brace 45 seen in fig3 and 5 - 9 is shown attached between frame base 32 and upright frame section 34 to stabilize upright frame section 34 . fig4 - 9 show first ball guide 60 , supported at least partially in its angular extension from frame crossbar 53 by first ball guide brace 50 , and second ball guide 65 , seen in fig5 and 7 - 9 , shown supported at least partially in its angular extension from frame crossbar 53 by second ball guide brace 55 . fig4 and 6 also show first ball guide 60 supported in part by first ball guide brace 50 . fig4 - 9 also show ball caddy 85 suspended from a plurality of frame uprights 84 . ball catch 82 is configured to catch a ball and direct it onto ball return rails 83 which direct the ball back towards a shooter . referring again to fig4 , upright frame section 34 , first ball guide 60 and first net support arm 70 are all seen lowered in a storage configuration . fig6 is a side view of basketball free throw training aid 30 with first ball guide 60 , including first ball guide upper segment 62 extended for use from first ball guide lower segment 61 . fig7 - 9 show free throw training aid 30 including frame 31 having frame base 32 mounted on a plurality of wheels 33 . upright frame section 34 attaches to frame base 32 . ball caddy 85 is configured to hold a plurality of balls for storage and transport . free throw training aid 30 as shown in fig7 - 9 includes first ball guide 60 including first ball guide lower segment 61 attached to frame crossbar 53 by first ball guide pivotable connector 64 and slideably engaging first ball guide upper segment 62 and held in position with respect thereto by first ball guide set screw 63 . first ball guide 60 is further supported in its angular extension from frame crossbar 53 by first ball guide brace 50 . second ball guide 65 includes second ball guide lower segment 66 attached to by second ball guide pivotable connector 69 and slideably engaging second ball guide upper segment 67 and held in position with respect thereto by second ball guide set screw 68 . second ball guide 65 is further supported in its angular extension from frame crossbar 53 by second ball guide brace 55 . horizontal standard 75 includes first horizontal tubular segment 76 and second horizontal tubular segment 77 held in position with respect to one another , at least partially , by horizontal width adjustment set screw 78 . horizontal standard 75 is connected between first ball guide 60 and second ball guide 65 . free throw training aid 30 as shown in fig7 - 9 also includes first net support arm 70 having first net support arm lower tubular segment 71 attached to frame crossbar 53 by first net support arm pivotable connector 58 and slideably engaging first net support arm upper tubular segment 72 and held in position with respect thereto by first net support arm set screw 73 . first net support arm 70 is held against upright frame section 34 by first net support bale 74 . fig7 - 9 also show second net support arm 90 having second net support arm lower tubular segment 91 attached to frame crossbar 53 by second net support arm pivotable connector 59 and slideably engaging second net support arm upper tubular segment 92 and held in position with respect thereto by second net support arm set screw 93 . second net support arm 90 is held against upright frame section 34 by first net support bale 94 . fig1 is a detail view showing frame cross bar 53 attached to vertical slide member 52 which slideably cooperates with vertical frame element 51 . a vertical position of vertical slide member 52 with respect to vertical frame element 51 is maintained by slide set screw 54 . referring again to fig4 - 9 , a sequence of views steps taken in setting up free throw training aid 30 . initially width w , as shown in fig5 , between first ball guide 60 and second ball guide 65 may be adjusted by loosening horizontal width adjustment set screw 78 of horizontal standard 75 and moving first ball guide 60 and second ball guide 65 in or out as desired extending or retracting horizontal first tubular segment 76 in or from horizontal second tubular segment 77 . when a desired width w is selected , width w is set by tightening horizontal width adjustment set screw 78 . next , first ball guide 60 , shown in fig5 and 6 , supported at least partially in its angular extension from frame crossbar 53 by first ball guide brace 50 , and second ball guide 65 , seen in fig5 , shown supported at least partially in its angular extension from frame crossbar 53 by second ball guide brace 55 , are extended . referring to fig5 and 6 , it will be noted that first ball guide 60 includes first ball guide lower tubular segment 61 pivotally attached to frame cross bar 53 by first ball guide pivotable connector 64 . first ball guide upper tubular segment 62 slideably engages first ball guide lower tubular segment 61 . similarly . referring to fig5 , second ball guide 65 includes second ball guide lower tubular segment 66 pivotally attached to frame cross bar 53 by second ball guide pivotable connector 69 . second ball guide upper tubular segment 67 slideably engages first ball guide lower tubular segment 66 . referring to fig5 , to extend first ball guide 60 and second ball guide 65 , first ball guide set screw 63 and second ball guide set screw 68 are loosened and first ball guide upper tubular segment 62 and second ball guide upper tubular segment 67 are extended until first ball guide 60 and second ball guide 65 reach a desired length . first ball guide set screw 63 and second ball guide set screw 68 are then re - tightened . referring to fig7 , the next step taken in configuring free throw training aid 30 for use involves extending first net support arm 70 and second net support arm 90 . first net support set screw 73 and second net support set screw 93 are loosened and first net support arm upper tubular segment 72 is extracted from first net support arm lower tubular segment 72 and extended beneath first net support bale 74 . when a desired length is achieved , first net support set screw 73 is re - tightened . similarly , with second net support set screw 93 loosened , second net support arm upper tubular segment 92 is extracted from second net support arm lower tubular segment 91 and extended beneath second net support bale 94 . again , when a desired length is achieved , second net support set screw 93 is re - tightened . referring to fig8 , the next step taken in setting up free throw training aid 30 involves raising upright frame section 34 from frame base 32 . before raising upright frame section 34 , first vertical frame section set screw 42 and second vertical frame section set screw 43 are loosened . upright frame section 34 includes first vertical frame tubular slide element 56 slideably engages first frame base upright 40 . similarly , second vertical frame tubular slide element 57 slideably engages second frame base upright 41 . as upright frame section 34 is raised with respect to frame base 32 , first vertical frame tubular slide element 56 remains slideably engaged with first frame base upright 40 . similarly , second vertical frame tubular slide element 57 remains slideably engaged with second frame base upright 41 . lateral support for upright frame section 34 continues to be provided by engagement of first vertical frame tubular slide element 56 with first frame base upright 40 and second vertical frame tubular slide element 57 with second frame base upright 41 . upright frame section 34 together with the connected structure including , first and second ball guides 60 and 65 respectively , first and second net support arms 70 and 90 respectively , all attached to frame cross bar 53 may be raised by lifting frame cross bar 53 and the attached upright frame section 34 to a desired selected height and first vertical frame section set screw 42 and second vertical frame section set screw 43 are then re - tightened . referring again to fig9 , the next step taken in configuring free throw training aid 30 for use is shown . it will be noted that frame 31 includes vertical frame element 51 attached to upright frame section 34 . frame cross bar 53 is attached to vertical slide member 52 which slideably cooperates with vertical frame element 51 . a vertical position of vertical slide member 52 with respect to vertical frame element 51 is maintained by slide set screw 54 . to raise vertical slide member 52 and its attached structure , slide set screw 54 is loosened and frame cross bar 53 is lifted to a desired position where slide set screw 54 is re - tightened . it should be noted that a height of horizontal standard 75 may be increased or decreased incrementally simply by incrementally raising or lowering slide member 52 and the attached frame cross bar 53 . referring again to fig1 vertical slide member 52 is shown including incremental height indicator 95 . sight window 96 is formed including index pointer 97 which may be aligned with one of the plurality of index hash marks 98 which represent the incremental raising or lowering of vertical slide member 52 and the attached horizontal standard 75 . similarly , it should be apparent that a height of horizontal standard 75 may be increased or decreased incrementally simply by incrementally raising or lowering upright frame section 34 . finally , it bears noting that a height of horizontal standard 75 may also be increased or decreased incrementally by incrementally extending or retracting first ball guide upper tubular segment 62 with respect to first ball guide lower tubular segment 61 and second ball guide upper tubular segment 67 second ball guide lower tubular segment 66 with respect to second ball guide pivotable connector 69 . the foregoing description of the illustrated embodiments has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiment ( s ) and implementation ( s ) disclosed . modifications and variations will be apparent to practitioners skilled in this art . process steps described might be interchangeable with other steps in order to achieve the same result . at least one preferred embodiment was chosen and described in order to best explain the principles of the invention and a best mode of practical application , thereby to enable others skilled in the art to understand the invention and the various modifications that are suited to the particular use or implementation contemplated . the scope of the invention is defined by the claims appended hereto and their equivalents . reference to an element in the singular is not intended to mean “ one and only one ” unless explicitly so stated , but rather means “ one or more .” no claim element herein is to be construed under the provisions of 35 u . s . c . sec . 112 , sixth paragraph unless the element is expressly recited using the phrase “ means for . . . .”
a free throw training aid including a frame adapted for positioning on a floor below a hoop attached to a backboard . the free throw training aid includes a pair of spaced apart ball guides attached to the frame , extending diagonally from the frame along a plane that lies substantially perpendicular to the backboard . a substantially horizontal standard attaches between the pair of spaced apart ball guides . a shooter is intended to shoot a basketball over the horizontal and between the spaced apart ball guides . visual feedback is provided to the shooter or an observer by comparing the angle of the based upon a comparison of the pair of spaced apart ball guides to a flight of the ball after it passes over the horizontal standard and upon its decent to the rim and the entry angle as the ball enters the hoop .