referring now to the drawings in greater detail , fig1 shows the knee rehabilitation apparatus 1 of the present invention . the apparatus comprises a frame having end pieces 10 , 46 and side pieces 9 connected to the end pieces . positioned between the end pieces 10 , 46 are tracks 22 ( also shown in fig8 ) which support various attachments such as the pedal assembly 11 , 12 , 13 and the shuttles 17 , 21 21 , 49 , and , chair 2 , 3 , 4 , and also allows these attachments to move along the tracks . attached to the tracks 22 is a chair with a seat portion 3 , a back rest 2 , and a head rest 4 . the chair has supporting legs 8 to attach it to the tracks 22 by rollers 39 . the front legs of the chair have tension band support bars 33 attached near the top of the front legs 8 in such a manner as to cause a continuous 3 / 16 inch space from the attachment past the free end of support bars 33 , for a purpose to be described below . it should be noted that there are two shuttles mounted on the tracks , however , only one is shown in fig1 for purposes of clarity . each shuttle assembly comprises a supporting plate 17 ( see also fig1 ) which have supporting blocks 49 and posts 21 attached thereto in any conventional manner . the support blocks support the riser 14 , which is shown in fig1 . at the top of the riser 14 is a leg or foot rest 15 curved to make it more comfortable for a user to rest his / her leg or foot inside the concave surface of the foot rest 15 . spanning across the curved sides of the foot rest 15 is a rod 16 which will allow the user to pull or push against when doing various exercises . the plate 17 is similar to the plate 38 ( see fig1 ), has rollers 39 attached to the bottom of the plate which engage the v - shape extensions 40 on tracks 22 to allow the plate to reciprocate along the tracks 22 . elastic tension bands 50 , shown in fig1 , can be attached to the bars 33 , 32 and posts 21 to provide resistance while a user is performing a variety of exercises . the tension bands can be made from any type of elastic material and can be provided in various resistances so the doctor or physical therapist can prescribe exact tensions from start to finish of the rehabilitation process . in addition , the bands should have an indicia thereon , such as , but not limited to , color coding so a user will know the resistance being used . at one end of the frameworks is a pair of vertical posts 18 which are attached to the end piece 46 by any conventional means . the posts 18 have a series of apertures 27 positioned thereon , adjacent their lower end . the apertures 27 receive bars 26 which are attached to the adjustable step 24 . by placing the bars 26 in the apertures 27 , the height of the step can be adjusted so a user can perform step exercises . the bar 29 , mounted adjacent the upper end of the posts 18 , provide the user with a hand rest for stability while performing step exercises . in addition bars 32 are mounted on each of the posts 18 midway of the length of bar 32 , in such a way as to cause a continuous 3 / 16 inch space between posts 18 and bars 32 from attachment up to the upper free end of bar 32 and down to the lower free end so that the bands 50 can be attached thereto while performing various exercises . the bands 50 can be attached in various ways , depending on : resistance level , direction of resistance , or whether the apparatus serves only as an anchor point for the band &# 39 ; s two knotted ends while the center is looped around a body part , i . e . calf , knee , thigh etc . attaching the band from left bar 33 to left post 21 will provide forward loading of the left shuttle and rearward loading of the right shuttle . attaching the band from right bar 33 to right post 21 will provide forward loading of the right shuttle and rearward loading of the left shuttle . attaching the band from left post 21 to left bar 32 will provide rearward loading of the left shuttle and forward loading of the right shuttle . attaching the band from right post 21 to right bar 32 will provide forward loading of the left shuttle and rearward loading of the right shuttle . attaching the band from left bar 33 to left bar 32 and / or from right bar 33 to right bar 32 loads chair 2 , 3 , 4 in relationship to pressure plates 30 and / or 31 . any anchor position around capturing body parts loads in practically all directions from various anchor point on the apparatus . it should be noted that resistance can be varied using bands of different values , the number of bands , the number of attachment positions , or various combinations of the preceding three . also attached to the posts 18 are push plates 30 , 31 which a user can place their feet against and push while sitting , or lying in the chair . this will allow the user to perform various isometric exercises . the push plate surface 30 is angled with respect to the plate surface 31 which will provide strength to the push plate 30 and will allow the user to place his / her feet in a variety of positions to perform exercises . as shown in fig2 - 4 , the back rest 2 of the chair is adjustable with respect to the seat 3 . the back has a rod 5 attached thereto by a bracket 35 at its upper end . the lower end of the rod 5 has a series of slots 43 therein . the rear legs 8 have a plate attached thereto , and the plate has a pin or bar 34 , allowing the chair back 2 to be adjusted from a vertical to a horizontal position . as shown in fig5 the head rest 4 can be adjusted with respect to the back 2 . the head rest has a bar 41 attached thereto by any conventional means , and the chair back has a plate 51 with an aperture that receives the bar 41 . a set screw 42 can be used to secure the bar in a selected position with respect to the back 42 of the chair . as shown in fig1 and 6 - 8 , bicycle type pedals 12 are mounted to the exercise device . the pedals 12 are mounted to a rotatable hub 13 similar to a bicycle &# 39 ; s pedals . the pedals are mounted by means of a post 11 to support plate 38 . the plate has rollers 39 which cooperate with v - shaped projections 40 on the tracks 22 to allow the pedal assembly to be positioned in front of the seat ( which is the in use position ) or to be slid along the tracks under the seat ( which is the non - use or storage position ). the pedal assembly can be locked in the stored position by a pin 52 which passes through aligned holes in the brace 51 and the support post 11 ( see fig1 ). a similar brace will be positioned to lock the pedal assembly in the use position . it should be noted that the brace is not shown in fig1 for reasons of clarity . in order to provide resistance to the movement of the pedals , a permanent magnet 60 is mounted on each side of the arms which connect the pedals 12 to the hub 13 . in addition , metal plates 44 are secured to the hub so they will not rotate with respect to the hub . as the pedals , with the magnets , pass the metal plates , the magnets will be attracted to the plates which will require that the user push harder on the pedals to move them past the metal plates . this will provide resistance to the pedals . obviously , the strength and position of the magnets 39 relative to the metal plate 44 can be varied in order to provide different resistance to the pedals 12 . the chair can be moved along the tracks 22 so that it can be adjusted to fit users of different sizes , or to move the chair toward or away from the front piece 46 to perform different exercises . as shown in fig1 and 16 , the legs 8 have a plate 55 attached thereto , and the plate has a strap 57 which receives a sliding bolt 47 . once the chair is placed in a selected position , it can be locked into that position by sliding the bolt 47 into one of the holes 23 placed along the top of side pieces 9 . near the rear of this device is a flange 54 which has a hollow stem 56 . inside the hollow stem 56 is a spring 20 . there is a hole 45 centered in the track side of end piece 10 . opposite this hole 45 is a fixed rod 25 that protrudes inward through the center of hole 45 . the inside diameter of the spring 20 and the outside diameter of rod 25 are such as to allow spring 20 to slip over rod 25 . the spring 20 protrudes out past the end of the hollow tube 56 . spring 20 is placed over fixed rod 25 , then hollow stem 56 is pushed into hole 45 until spring 20 abuts against the inside wall of end piece 10 opposite hole 45 . a cable 36 ( see fig1 ) is passed around the pulleys 37 , 28 and the ends of the cable 36 attach the shuttles together so that as one shuttle 17 , 21 , 49 moves forward , the other shuttle moves rearward . the spring 55 provides an automatic tension adjustment for the cables . in order to use the exercise device , a user would adjust the chair 2 , 3 , 4 so the back rest 2 and the head rest 4 are at the proper position for the individual user . next the entire chair would be moved along tracks 22 until it is in the proper position and then locked in place by placing the bolts 47 into the holes 23 spaced along the side pieces 9 . next elastic bands 50 could be attached to posts 21 on the shuttles 17 , 21 , 49 and bars 32 and on the vertical posts 18 ( or on bars 32 ) and / or to posts 21 on the shuttle 17 , 21 , 49 and bar 33 on the front chair legs to provide resistance . the user could then sit in the chair and place their legs into the concave portions 15 of the risers 14 . at this point , the user can rest their heel with the bottom portion of their foot against the bar 16 ( or by pulling on bar 16 ) with their heels , the user can exercise against the resistance of the bands 50 . an alternative exercise can be performed by removing the risers 14 and the user can then step onto the top of the shuttle 17 , 21 , 49 and use the device as a skier . also while sitting in the chair in adjusted locked position , and with feet on the shuttles 17 , 21 , 49 resistance can be applied pushing , pulling or in both directions . the shuttles will be pulled in opposite directions by the cables as explained above . an alternative exercise can be the stationary bike which can be used by positioning the pedals 12 in front of the chair 2 , 3 , 4 as described above , and pedaling as they normally would on a stationary bike . another exercise that could be performed is the stair climb , which can be performed by placing the step 24 in the proper holes 27 to attain the selected height . then the user can alternately step up and down on the step 24 . another exercise that could be performed is the isometric leg press , which is done by sitting or lying in the chair and pushing against the plates 30 , 31 . the above exercises are merely examples of the types of exercises that can be performed with the device of the present invention . other exercises can be designed to be used with the device of the present invention without departing from the scope of the invention . although the knehab and the method of using the same according to the present invention has been described in the foregoing specification with considerable details , it is to be understood that modifications may be made to the invention which do not exceed the scope of the appended claims and modified forms of the present invention done by the others skilled in the art to which the invention pertains will be considered infringements of this invention when those modified forms fall within the scope of this invention .
an exercise device for rehabilitating knees comprising a framework , an adjustable seat , exercise pedals and reciprocating shuttles which are mounted on supporting tracks and can be used to perform various exercises .