as best seen in fig1 , footswitch 10 of the present invention generally includes base 12 , treadle 14 having heel cup 16 and side or wing switches 18 , all of which can be made from any suitable material , such as stainless steel , titanium or plastic . base 12 may contain protective bumper 20 made from a relatively soft elastomeric material . as best seen in fig2 a - 2c , 3 and 4 a - 4 b , side switches 18 may be adjusted inwardly ( fig2 b ) or outwardly ( fig2 c ) to increase or decrease the distance between switches 18 and accommodate for variations in the width of user foot 100 . such adjustment is accomplished by pushing on locking buttons 22 , causing locking pin 24 on base 12 to be released from within detents 26 in switches 18 and rotating about pins 28 in holes 30 located on base 12 . when buttons 22 are released , springs 32 push detents 26 against locking pin 24 , thereby holding switches 18 in a locked position . the relative position of switches 18 may be determined visually by the use of switch position indicators 34 , as best seen in fig2 b and 2c . as best seen in fig5 , 6 and 7 a - 7 b , the length of treadle 14 may be adjusted by sliding movement of heel cup 16 . as best seen in fig6 , treadle 14 is mounted to treadle base 36 by thrust bearing 38 , thereby allowing treadle 14 to pivot about axis 40 . heel cup slide 42 is received on treadle 14 and contains locking lever 44 , which is held onto heel cup slide 42 by retainers 46 . locking pins 48 are held within locking lever 44 by shafts 50 . locking pins 48 are biased into locking pin holes 52 in treadle 14 by springs 54 pushing against locking pin retainer 56 . in this manner , pushing on locking lever 44 pulls locking pins 48 out of locking pin holes 52 and allows heel cup slide 42 to slide lengthwise along slots 58 in treadle 14 as illustrated in fig7 a - 7b . the relative position of heel cup 16 relative to treadle 14 may be visually indicated by indicators 60 . in addition , treadle 14 may contain raised reference point 62 , indicating the center oftreadle 14 . the width and length adjustments described above preferably allow footswitch 10 to be adjusted to accommodate the 5 th percentile female to the 95 th percentile male foot width and length , with or without shoes . as best seen in fig1 , ankle rotation axis 65 of foot 100 is located behind pivot axis 68 of treadle 14 for all three treadle lengths . as best seen in fig8 and 9 a - 9 b , treadle 14 may rotate or counter - rotate about thrust bearing 38 to operate left and right switches 64 , which are mounted on treadle base 36 . return springs 66 provide for automatic centering of treadle 14 following rotation . as best seen in fig1 a and 11b , treadle base 36 contains alignment pin 70 hat fits within hole 72 in base 12 when treadle 14 is in the resting , non - pivoted position . such a construction prevent rotation of treadle 14 to activation switches 64 when treadle is in the resting , non - pivoted position ( fig1 a ), but allows rotation of treadle 14 when treadle 14 is depressed or pivoted ( fig1 b ). as shown in fig1 and 13 , heel cup 16 is mounted to heel cup slide 42 using thrust bearing 74 , alignment cap 76 and screws 82 . such a construction allow for the rotation of heel cup 16 independently of any rotation of treadle 14 ( as show in fig8 and 9 a - 9 b ) and allows for the operation of side switches 18 when treadle is in the resting and rotationally locked position ( fig1 a ). return lever , 78 , mounted to heel cup 16 acts against return springs 80 to provide for automatic centering of heel cup 16 in the resting position . as shown in fig1 and 15 a - 15 c , bottom 85 of base 12 preferably is covered by relatively high friction polymer ( e . g ., versaflex tpe ) material 84 and contains a plurality of retractable , anti - gravity spring - loaded plunger feet 86 made from a low friction polymer material ( e . g ., delrin ® acetal resin ). as shown in fig1 a and 15b , when there is no weight on footswitch 10 , spring loaded plunger 86 project a short distance d ( e . g ., 0 . 04 inches ) outwardly from bottom 84 , thereby contacting the floor and allowing easy sliding of footswitch 10 on relatively low friction plunger tips 88 . as shown in fig1 c , when weight is placed on footswitch 10 , plungers 86 retract , and high friction bottom 84 contacts the floor , thereby making it more difficult to slide footswitch 10 during use . this description is given for purposes of illustration and explanation . it will be apparent to those skilled in the relevant art that modifications may be made to the invention as herein described without departing from its scope or spirit .
a footswitch having an adjustable treadle and switch placements , thereby helping to make the footswitch ergonomically more correct for a variety of users .