Patent Publication Number: US-4921243-A

Title: Motion apparatus

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a motion apparatus for circulatory stimulation and for therapy of vascular diseases of the leg. 
     2. Description of the Prior Art 
     Unsatisfactory blood circulation in legs particularly occurs with professionals who often sit at a desk and with people who, during the performance of their job, have to stand for extended periods of times. It has been shown that in such cases, blood circulation can be stimulated by means of therapeutic movement of the ankles. Devices have been created which cause a rhythmic tipping movement of the foot relative to the lower leg. It is advantageous if the device forces a tilting movement with a push-pull motion. 
     U.S. Pat. No. 4,159,111 describes an apparatus having two pedals connected with one another by a two-armed tipping lever, the pivotal axis of which moves perpendicularly to the pivotal axis of the pedal. The magnitude of force for operation can be adjusted by a friction brake on the pivotal axis of a pivotal lever. 
     In a device taught by GB-PS 2,031,742, pedals are connected to bellows and the bellows are connected with one another by a connecting pipe. While the magnitude of force necessary for activation can be adjusted in a single case by a friction brake, an adjustable valve in the connecting line serves such purpose. 
     In an apparatus taught by U.S. Pat. No. 3,917,261, a motor drives the pedals in a push-pull motion. With such apparatus, the patient is more passive since the patient&#39;s feet are swung up and down about the ankles by the motor. 
     SUMMARY OF THE INVENTION 
     This invention relates to a motion device having an active operation which is relatively more pleasant for the user to operate and is therapeutically more effective than the devices described above. In the prior art devices when changing from one foot to the other foot, the apparatus must accelerate from a rest position each time which requires a greater magnitude of torque force than when the apparatus has constant velocity. The known devices require that the user consciously pedal which is a disadvantage if the user desires to simultaneously carry out therapy and other activities such as working while sitting down at a table. This invention relates to a device which reduces the effect of a top dead center point which prevents unconscious stepping without entirely eliminating the need for active operation by the user. 
     An apparatus according to this invention has a mechanism between the pedals which automatically causes a tilting movement of both pedals. 
     A motion apparatus according to this invention includes a mechanism attached between two pedals which are pivotally mounted near an area where the heel of a foot rests. The mechanism includes a gear system having a shaft which is parallel to the pivot axis of the pedal. The shaft is connected to a transmission gear which drives a flywheel. The flywheel ensures that the top dead center points are easily overcome. The flywheel permits the application of a comfortable, smooth running and precisely adjustable brake which allows for sensitive adjustment to the magnitude of force for the ankle motion. The pedals can have foot reflex zone massage plates. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A motion device according to one embodiment of this invention is shown in the simplified drawings wherein: 
     FIG. 1 shows a side view of a left pedal along line 1--1 as shown in FIG. 4; 
     FIG. 2 shows a side view of the mechanism; 
     FIG. 3 shows a top view of the mechansim; 
     FIG. 4 shows a top view of the complete device; and 
     FIG. 5 shows a cross-sectional view of a portion of the pedal having a foot reflex zone mat and a massage element. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 2 and 3 show side and top views of the mechanism. The rotable parts are supported in a frame (1). The rotable parts comprise a gear system (2) with a shaft (21) which supports a disk (22) at each end of the shaft (21). A toothed belt (25) drives a toothed pinion (31) which is attached to an intermediate shaft (30). An additional relatively large toothed wheel (32) is attached to the intermediate shaft (30) and a toothed belt (33) drives a toothed pinion (41) on a flywheel shaft (40). The flywheel (42) is attached to the flywheel shaft (40). The transmission gear as constructed creates a transmission ratio of approximately 1 to 30 between the crankshaft (21) and the flywheel shaft (40). 
     A support mount (43) is constructed on one side of the frame (1) and at point (44) a brake lever (45) is connected. Since the braking force, because of the relatively large transmission ratio, need only be relatively slight in order to achieve an amplified effect, the brake lever (45) is balanced out by a weight (46). Adjustment of the braking force is achieved by shifting the weight (47) along the brake lever (45). On the lower side, the brake lever (45) has a brake lining (48). 
     The mechanism is attached to a base plate (5) and covered by a hood unit (51). Only the handle of the displaceable counterweight (47) projects out from the hood unit (51) through the aperture slot (58) as shown in FIG. 4. 
     FIG. 1 shows the internal side of left pedal (50). Aperture slot (53) is applied in one side wall (52), into which a sliding block (26) and the connected crank pin (23) snugly engages. The sliding block (26) is preferably constructed of Teflon so that no lubrication is necessary. In lieu of the sliding blocks (26), ball bearings can also be used. As shown in FIG. 1, as viewed in a vertical plane, an intersection of the centerlines of shaft (21) and both crank pins (23) with the vertical plane, which is perpendicular to base plate (5), forms an angle (A). It is preferred that angle (A) is less than 180° to eliminate a &#34;dead spot&#34; position where the centerlines of crank pins (23) could potentially align and thus cause one pedal (50) to reach a bottom dead center while the opposing pedal (50) reaches a top dead center. Such &#34;dead spot&#34; position is undesirable in a momentum driven device. The pedal (50) has a foot plate (54) which is pivotally connected with the base plate (5) by means of the hinge (55). Apron units (56, 57) form an external covering and are attached at the front and back of the foot plate. One apron unit not shown in FIG. 1 is attached to the externally directed side of the pedal. 
     A reflex zone massage mat (60) is shaped according to a foot sole and has protrusions of various heights. The mat can be applied to the foot plate. As shown in FIG. 4, the massage mat (60) has protrusions which are indicated by a dotted surface. 
     A flat reflex zone massage plate (61) which covers nearly the entire foot plate (54) of the pedal is also shown in FIG. 4. As shown in FIG. 5, mushroom-shaped massage elements (62) can be applied at various points of the foot plate to individually stimulate every desired reflex zone of the patient&#39;s foot. The mat (60) is attached to the foot plate (54) in a removable manner by means of pegs (63) so that the massage elements (62) can be attached without causing discomfort. Since the crank pins (23) do not lie diametrically opposed to one another, the motion device can always be set into motion from a rest position. 
     Toothed belts and engageable toothed wheels are used in the transmission gear. It is apparent that other transmission elements can also be used.