referring to the accompanying drawings in greater detail , a therapeutic treatment machine 10 according to the present invention includes a rectangular table frame 12 supporting an upper body pad 14 located toward the head end of the table , a series of six freely rotatable massage rollers 16 located toward the middle of the table and a motor driven , longitudinally and selectively reciprocable foot support platform 20 located toward the foot end of the table . rectangular frame 12 is made of , for instance , aluminum angle or tube , and has a forward or torso - supporting frame section 26 housing the upper body pad 14 and rollers 16 , and a rearward or foot - supporting frame section 28 housing the foot support platform 20 . frame sections 26 and 28 are rectangular and of similar size and shape . forward section 26 has a forward or head end member 30 and a rearward end 34 extending transversely between opposite longitudinally extending side members . table legs 40 support the machine at a convenient height for ease of use ( e . g . twenty to twenty - four inches ) and extend downward from the four corners of forward frame section 26 . rearward frame section 28 has transversely extending forward end 42 and rearward end 46 , and opposite sides 48 and 50 . table legs 40 extend downward from the back corners at rearward frame section 28 . table legs 40 are removably attached to frame 12 for ease and compactness of storage and may be conveniently but removably locked into frame 12 with spring - loaded detents of conventional design . forward frame section rearward end 34 may be connected along the lower surface to the lower surface of rearward frame section forward end 42 by a hinge to allow the two sections to be folded together for portability and storage compactness . as best illustrated in fig1 , 2 , 3 and 12 of the accompanying drawings , the corner joints of the table frame have a unique and simple construction that permits relatively rapid assembly of the table during manufacture . cast aluminum corner members 301 are provided with open u - shaped connector members extending therefrom in orthogonal relation , each connector member having a pair of parallel spaced arms 302 adapted to be slidably inserted into an elongated tubular frame component , for example frame side 36 , of the table . the arms 302 of the u - shaped connectors are secured in the aluminum tubular frame members by means of an adhesive , typically a two - component acrylic glue . each corner member 301 additionally includes a leg engagement member 303 adapted to be removably and telescopically received in a tubular table leg 40 and held in place by means of a v - shaped plastic spring , or other conventional detent mechanism for telescoping members . with this construction and the elimination of the welding steps , a table can be manufactured every fifteen minutes or less . the connector arms 302 are sized and spaced to provide a slidable fit into the frame members 36 , et al , which are typically one inch by two inch cross - section aluminum tubes . the leg engagement member 303 is sized to slidably fit into a leg 40 which is typically a one inch square cross - section aluminum tube . the cast one - piece corner members are very inexpensive , and the adhesive attachment technique is much faster and less expensive than heliarc welding . two or multi - component adhesive or sealant systems consist of two or more resins or a resin and a hardener , crosslinker , activator or catalyst that when combined react and cure into a polymerized compound or bond . the component systems are typically mixed immediately before assembly and then applied . the process for constructing the frame at each corner is as follows . a . the two - part acrylic glue is in a two - part tube that has a mixing nozzle on the end and is dispensed with a gun onto a teflon sheet . b . the glue is inserted into the end of a frame member ( e . g ., member 36 ) along the end portions of the two shorter ( e . g ., one - inch ) sides of the aluminum tube with a plastic applicator . c . the glue is applied to the arms 302 which are then slid into the tubular frame member 36 . d . after all the corners are assembled the frame is put into a jig and allowed to cure for seven to eight minutes , after which the frame is removed and the next frame that was being assembled during the cure time is ready to be put in the jig . as best illustrated and described in the &# 39 ; 691 patent , friction bearings of , for instance , teflon , mounted on sections of aluminum channel , are attached to the underside of the upper body pad 14 and are slidably mounted in angle stock attached along the inner surfaces of the forward frame section sides . resistance to movement of upper body pad 14 along angle stock is proportional to the weight exerted on the pad and is equal in the forward and rearward direction . the forward and rearward displacement or stroke of the upper body pad along angle stock is limited by the forward end 30 of the forward frame section 26 and the mounting arrangement for rollers 16 . the upper body pad may comprise a plywood deck with foam rubber or other resilient padding material affixed to the upper surface and covered with a durable material offering frictional resistance to the head , shoulders and upper back of the patient . rollers 16 of conventional design are mounted in the forward frame section 26 and extend transversely of the frame with their axes parallel to one another at a location between end 34 and the upper body pad 14 . the rollers are partially exposed above the forward frame section 26 to contact the patient &# 39 ; s lower back or buttocks . the rollers are rotatably mounted to opposite sides of the frame by bronze pins extending from the axles of the rollers , through washers and holes drilled in the inner surfaces of aluminum channel 74 attached to the inner surfaces of the frame sides and into bearings that are press - fit into the channels . foot support platform 20 has a generally rectangular base 78 sized to fit horizontally between rearward frame section sides 48 and 50 . a molded foot rest assembly 80 is attached to the upper surface of base 78 . as described in my &# 39 ; 691 patent , bearing blocks of , for instance , teflon , are held against the lower surface of each corner of base 78 by bolts passing through holes in foot rest assembly 80 , holes in base 78 , holes in the bearing blocks and holes in sections of aluminum angle and threadedly received by nuts . slots 100 formed in the outer surfaces of the bearing blocks receive the horizontal leg of the angle stock rigidly attached to the inner surfaces of frame sides 48 and 50 to slidingly support foot support platform 20 in the table frame 12 . the molded foot rest assembly 80 is attached to the top of base 78 and has a central console box 104 extending along its central front portion . padded heel rests 110 are disposed on either side of console box 104 , and footplate support brackets 112 are transversely spaced from one another at respective locations behind console box 104 . support brackets slidably and removably receive rectangular foot support plates 126 in a position wherein plates 126 extend upwardly and rearward from platform 20 in transversely spaced relation . a t - bar 106 has a stem portion 107 with a lower end extending toward base 78 through the space between brackets 112 to a location rearward of brackets 112 . the width of the t - bar stem 107 permits it to fit between brackets 112 , thereby permitting the stem to extend upwardly and forwardly between the brackets 112 and the foot support plates 126 . cross member 109 of t - bar 106 extends transversely in both directions from the top of stem 107 and has padded foot clamps 118 secured at each end thereof . foot clamps 118 are hollow cylindrical padded members configured to slide onto respective ends of cross member 107 in positions forwardly of and in longitudinal alignment with respective foot plates 126 . t - bar stem 107 has a slot 111 defined therethrough and extending longitudinally along a portion of the stem . a threaded bolt 122 extends through slot 111 and is retained in threaded engagement with a threaded hole in console box 104 . when the bolt is tightened in place by rotation of is actuator knob 124 , the otherwise unsecured t - bar stem 107 is secured to the machine . the degree of insertion of bolt 122 into the hole in the console determines the slack space between foot clamps 118 and foot plates 126 , thereby providing adjustability of that spacing for different patents . importantly , once the spacing is set for a particular patient , it does not have to be re - adjusted for that patent . the footplate support brackets 112 define respective slots on opposite sides of console box 104 and are sized to removably receive and support flat foot plates 126 in a generally upright position braced by support box 112 . foot plates 126 are removable for compact storage and portability . as noted previously above , the method used in my prior machine to hold the patient &# 39 ; s feet in the molded box involved a t - bar hinged at the bottom and held against the foot with pressure applied against the t - bar by a threaded handle . the aforementioned method of holding the feet in place was not very effective and was , in fact , ultimately replaced with two straps that went over the feet and around posts attached to the motor box . that strapping method , while holding the feet in place , also meant that a person with a bad back had to bend over to strap his / her feet in place . the approach to holding the feet in place with the present invention uses t - bar 106 with a four inch adjustment slot 111 held in place on the molded box with a threaded handle 124 . this system allows the user to set the t - bar one time and then to slide his / her feet into position from the sides , locking them in place while in a supine position when the machine is to be used . a second advantage to this approach is that the force applied to the t - bar presses the t - bar against the motor box , thereby stabilizing the t - bar instead of tending to tear it from the motor box . positioning arrows may be inscribed on the upper sides of the molded foot rest assembly to align with a series of marks inscribed along frame sides to indicate various separation distances between the upper body pad 14 and foot support platform 20 corresponding to various patient torso lengths . as described in the &# 39 ; 691 patent , transverse hinges may be mounted on the front and rear edges , respectively , of foot support platform 20 and are spring biased in a partially open position . safety stop microswitches may be mounted on the front and rear edges , respectively , of foot support platform 20 and activated by the rotational closing of the hinges in response to a body part or other obstruction closing the hinge by blocking the unimpeded forward or backward movement of the foot support platform within frame 12 . activation of either microswitch causes the platform reciprocation to immediately stop , as is described more fully below , to prevent accidental injuries . the drive system of the present invention uses a simple rotating arm driven by a gear motor . specifically , 12vdc is fed from a wall adapter to a female plug 201 and is then routed for safety through a circuit breaker 202 and then to a four - position connector / junction box 204 . from the connector the red wire in conductor cord 206 is fed to an on / off switch 207 in a control box 208 . the green wire is energized when the switch 207 is turned on , and feeds 12vdc to the gear motor 205 through the red motor wire at the connector 204 . the yellow wire from the switch 207 joins the brown wire at the connector 204 and then feeds current to timer 209 . the black wire from the timer joins the black wire from the gear motor 205 at the connector . when the switch 207 is turned on , 12vdc is fed to the timer 209 . when the timer is activated current is fed to the gear motor 205 . the gear motor rotates a drive arm 210 and the machine is activated . the microswitch 203 activates the gear motor 205 until its actuator arm is depressed . therefore , when the timer 209 completes its cycle , current is still fed to the gear motor 205 until the drive arm 210 contacts the microswitch 203 with a rubber bumper located under the end of the drive arm 210 opposite the bearing assembly 213 . this opens the circuit and stops the gear motor in the correct position . the rotation of the drive arm 210 moves the motor box horizontally approximately seven inches in a reciprocating forward and rearward motion through a bearing assembly 212 and linkage arm 213 which is connected to the frame of the machine by a threaded retaining screw 214 . specifically , the distal end of linkage arm 213 passes through a space defined by the bottom surface of frame member 42 and a u - shaped bracket having the ends of its legs secured to that surface near the longitudinal center of member 42 . linkage arm 213 is provided with a series of longitudinally spaced apertures through which retaining screw can be selectively inserted to determine the effective length of arm 213 for operation with a patient of given torso and body length . the speed or pace of the reciprocating displacements is a function of the tube motor rotation speed . this system allows the necessary motion to take place with a much simpler mechanism , thus saving a considerable amount of time and money , while accomplishing the same goal . the new motor box 218 is vacuum formed in one piece instead of requiring the three pieces in my original unit . a plywood deck 219 is glued in the inside of the motor box 218 . this plywood deck 219 has pre - drilled holes with tee - nuts installed to provide a solid method of attaching the gear motor and other parts . in use of the machine , a patient first positions upper body pad 14 . foot support platform 20 is then positioned to accommodate the torso length of the patient . the patient lies supine on the table with head , shoulders and upper back resting on upper body pad 14 and lower back and buttocks resting on rollers 16 . the patient &# 39 ; s feet are inserted under pre - positioned foot clamps 118 , with the bottoms of the feet pressed against foot plates 126 and the backs of the feet resting on heel rests 110 to comfortably secure the feet in position between the heel rests and foot clamps . the therapeutic treatment machine is then energized by turning the on - off switch “ on ” position . the motor rotates , driving the foot support platform 20 along frame sides 48 and 50 , supported and guided by slots in bearing blocks . operation proceeds in the manner described above in connection with the description of the motor circuit . the weight or force exerted by the head , shoulders and upper back of the patient on the upper body pad 14 controls the frictional resistance to sliding developed between friction bearings and the angle stock and is equal in the forward and rearward direction . when the compression or tension force transmitted through the body of the patient by the reciprocating foot support platform exceeds the frictional force between the friction bearings and the angle stock , the upper body pad will slide along the table frame to relieve and prevent additional force from being carried by the body . consequently the patient can control the magnitude of tension and compression forces applied by the therapeutic treatment machine by increasing or decreasing the amount of body weight applied to the upper body pad . the platform continues to cycle back and forth applying alternating compression and traction to the patient until turned off at the on - off switch or until an obstruction of foot support platform 20 activates a safety stop microswitch . during compression , posterior tilting of the pelvis takes place , decreasing lumbar lordosis , relaxing the posterior elements of the spine and compressing the anterior elements . during traction the pelvis tilts forward causing extension of the lumbar spine . the increase in lumbar lordosis causes compression of the posterior elements and traction of the anterior elements . when the treatment is concluded the machine can be partially dismantled for compact storage or ease of portability by removing legs 40 , t - bar 106 and foot plates 126 , and folding forward section 26 and rearward section 28 together . a timer is included in the circuitry to allow the user to preset a duration for traction - compression cycling . a microprocessor based controller can be used to program the nature and duration of treatment . furthermore , a simple ice bath of conventional design can effectively be incorporated into the roller apparatus to provide further therapeutic action or alternatively , the rollers can be replaced by a temperature controllable waterbag having low sliding resistance to allow the patient &# 39 ; s mid body to slide freely during compression and traction . the power to drive the reciprocating movement of the foot support platform can be provided alternatively by a conventional rack and pinion drive , a screw actuator , a hydraulic piston or a drive wheel . in addition the braking action exerted by the weight of the patient &# 39 ; s upper body acting frictionally on the bearing pads can alternatively be provided by conventional mechanical , electrical or hydraulic brakes or by force exerted by the patient against handles attached to the frame . a preferred mode of operation of the present invention involves applying forces of equal magnitude during the compression and traction , or pushing and pulling , sequences . the magnitude of the compression and tension force applied to the patient &# 39 ; s body depends on the force exerted on the upper body pad . typically forces applied to the patient are in the range of ten to seventy pounds . in view of the foregoing it is apparent that the present invention provides a therapeutic treatment machine capable of applying alternating cycles of preselected degrees of compression and traction to the back and spinal column or to other portions of a patients body . the machine is adjustable to accommodate different torso lengths and allows the patient to control the duration , frequency and intensity of treatment . the sliding engagement between the patient and the upper body support pad combines ease of control and protection against the application of excessive forces . safety step switches activated by any obstruction in the path of the reciprocating foot support platform prevent accidental injury to the patient or others and the use of stepped - down 12 volt ac converted to dc at the machine minimizes electrical risk . the fold - away nature of the hinged table and removable legs and t - bar allows the machine to portably accompany the patient to provide treatment while traveling . inasmuch as the present invention is subject to many variations , modifications and changes in detail , it is intended that all subject matter discussed above or shown in the accompanying drawings be interpreted as illustrative only and not be taken in a limiting sense .
a therapeutic treatment machine alternatingly applies compression and traction to a patient . a frame includes : a platform having an upper body support pad with controllable resistance to forward and backward displacement ; rollers supporting the lower back , buttocks and thighs ; and a motor - driven foot support displaceable forward and backward predetermined distances and speeds . tubular frame members fit over and adhesively engage arms projecting orthogonally from a corner section . legs telescopically receive leg support members extending orthogonally from the arms . compression and traction are each forcefully effected by motor rotation converted to longitudinal reciprocation of a linkage that drives the foot support . the patient &# 39 ; s feet are held in place against footplates by clamps supported on a t - bar cross member having a stem extending forwardly through a longitudinal slot in the footplates . a threaded bolt extends through the slot to engage the platform at selectable locations to secure the t - bar to the footplates .