Abstract:
This invention relates to a whole body vibrator platform which is attachable to a treadmill. The treadmill belt provides the power to move the platform, translating the horizontal, linear, belt movement into vertical oscillations through one or more eccentrically mounted rollers which support the platform. A person standing on the vibrator platform experiences a vertical vibration at frequencies established by the linear velocity of the treadmill belt.

Description:
FIELD OF THE INVENTION 
   This invention relates to an accessory for a treadmill which enables the treadmill to be converted into a whole body vibrator. 
   BACKGROUND OF THE INVENTION 
   Recently, a product appeared on the market which was originally used by the Russians to rehabilitate their astronauts after being out in space for many days. This product or device is a machine that a person can stand on and it effects vibration on the whole body. The benefit of this is to loosen up joints and to improve blood and lymphatic circulation. Another claim is that by using the device, one gets the benefit of exercise without doing actual exercise. Whole body vibrator machines are relatively expensive. They cost anywhere from $4,000 to as much as $14,000 depending on the complexity of the device. 
   There is also a very inexpensive machine that consists only of a platform that is suspended in rubber cushions and the platform is vibrated only in a horizontal cyclical motion. This machine does not produce vibrations in a person&#39;s whole skeleton. It only vibrates the legs. 
   It would be desirable to provide a device which is very simple and it effects whole body vibration just like the expensive ones on the market but at a fraction of the cost. This invention has that objective. 
   The invention in its general form will first be described, and then its implementation in terms of specific embodiments will be detailed with reference to the drawings following hereafter. These embodiments are intended to demonstrate the principle of the invention, and the manner of its implementation. The invention in its broadest and more specific forms will then be further described, and defined, in each of the individual claims which conclude this Specification. 
   SUMMARY OF THE INVENTION 
   The invention, in one of its broader terms, is a mechanical device which can be attached to a treadmill where it converts the movement of the treadmill belt to an oscillating vertical motion. As such, the invention serves as a whole body vibrator. It includes a cylinder which has an eccentrically located shaft through it. The eccentric shaft extends beyond the ends of the cylinder. At the two opposite ends of the shaft there are bearings for accepting the shaft and allowing the shaft to freely rotate within, said bearings being also attached to a platform for a person to stand on. The platform is attached to the frame of the treadmill via a link, preferably a flexible bar, so as to localize the platform on the treadmill surface. 
   More particularly, the invention provides a whole body vibrator for attachment to a treadmill having a moving belt whereby the motion of the belt of the treadmill is converted to a vibratory motion comprising: 
   a) a platform on which a user may stand; 
   b) a roller for contacting the belt of a treadmill wherein the roller is eccentrically supported through bearings carried by said platform; and 
   c) a linkage connecting the platform to the treadmill to localize the platform on the belt and restrict longitudinal movement of the platform with respect to the belt, 
   whereby the advancement of the treadmill belt causes the platform to effect an oscillating motion suited to provide a user, whose feet are positioned on the platform, with a whole body vibration experience. 
   According to one variant of the invention the roller is carried by an axle that is eccentrically positioned with respect to the center of the roller and extending through the roller to provide protruding ends, said ends being supported by the bearings. According to another variant of the invention the roller has outer ends and eccentrically positioned shaft ends protruding from each of the respective ends of the roller to provide roller protrusions which are coupled to the platform through bearings carried by the platform. 
   The linkage which positions or localizes the platform on the belt is preferably longitudinally stiff but may be laterally flexible. In order to better distribute the weight of the platform and corresponding pressure on the surface of the belt and to reduce noise a resilient layer may be provided that extends over at least a portion of the surface of the roller that contacts the belt. 
   In order to provide a user with a display that includes a presentation corresponding to the frequency of oscillation of the platform, the whole body vibrator of the invention may include: 
   a) a magnetic element mounted on the roller, 
   b) a sensor for detecting the presence of the magnetic element mounted on the platform at a position to detect the magnetic element as it rotates past the sensor, 
   c) a display controller connected to the sensor for generating a signal based upon the rotational velocity of the roller, and 
   d) a display connected to the display controller to receive the signal for providing an indication of the rotational velocity of the roller. 
   The magnetic element may either be a piece of magnetic material, such as iron, or may be a magnetized material, such as magnetized iron or other permanently magnetized substance. The sensor may be a whole sensor or, conveniently when used in conjunction with a magnetized material, a simple coil that provides a electrical pulse as the magnetic element passes by the sensor. Simple circuitry in the controller, as would be well-known to persons skilled in the art can be employed to convert this signal into a readout for the user. 
   The foregoing summarizes the principal features of the invention and some of its optional aspects. The invention may be further understood by the description of the preferred embodiments, in conjunction with the drawings, which now follow. 
   Wherever ranges of values are referenced within this specification, sub-ranges therein are intended to be included within the scope of the invention unless otherwise indicated. Where characteristics are attributed to one or another variant of the invention, unless otherwise indicated, such characteristics are intended to apply to all other variants of the invention where such characteristics are appropriate or compatible with such other variants. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows the whole body vibrator device of the invention which is attachable to a treadmill. 
       FIG. 2  is an exploded view of the whole body vibrator of  FIG. 1   
       FIG. 3  shows the whole body vibrator of  FIG. 1  attached to a treadmill. 
       FIG. 4  shows an arrangement where a magnet attached to the roller, a sensor and a display is arranged to display relevant information to a user. 
       FIG. 5  shows the roller with a resilient layer over its outer surface. 
       FIG. 6  shows an exploded view of the roller with two shaft ends. 
       FIG. 7  shows an exploded perspective view of the underside of the whole body vibrator with the roller shown in cross-section whereby the roller rotates independently on the shaft, the bearing surface being provided between the roller and the shaft. 
   

   DESCRIPTION OF PREFERRED EMBODIMENTS 
   The whole body vibrator  20 , as best seen in  FIG. 1 , includes a platform  1  provided with two bearing housings  3  (shown in the form of pillow blocks) fixed to its underside face. These bearing housings  3  support an axle shaft  4  that carries a roller  2 . The roller  2  is eccentrically positioned with respect to the shaft  4  and is dimensioned such that it may easily contact belt  8  of a treadmill  21  when the device  20  is positioned thereon, as seen in  FIG. 3 . 
   The roller  2  may be either fixed in its connection to the axle shaft  4 , such that the two components rotate in unison, or it may be connected such that it may rotate independently from the shaft  4 . In the former case, bearings are fitted into the bearing housings  3  to rotatably carry the shaft  4  and roller  2 . In the latter case, the bearing surface for the vibrator  20  is provided between the roller and the shaft  4 , the bearing housings  3  need not incorporate true bearings. Collectively, these provide a bearing linkage that permits the roller to rotate eccentrically. 
   While the roller  2  is shown with a single shaft  4 , the outer ends of the roller  2  may instead be provided with respective protruding shaft ends  24  as shown in  FIG. 6  serving as axle stub ends. These shaft ends serve the same function as the single shaft  4  and are positioned in the same eccentric manner; however, they do not require extruding a channel throughout the length of the roller  2  to accommodate the shaft  4 . The shaft ends  24  instead may include inner portions which are solidly embedded within the interior of the roller  2 , acting as the axle stub ends. Alternatively, the roller  2  and two shaft ends  24  may be manufactured as a single, unitary component. Again, these shaft ends or stubs provide part of a bearing linkage that permits the roller to rotate eccentrically. 
   The system for employing the vibrator  20  further includes a linkage  22  connecting the platform  1  to the frame  10  of the treadmill  21 . This linkage  22  preferably of unitary form provides longitudinal stiffness and lateral flexibility when the vibrator device  20  is positioned on the treadmill  21 . Such lateral flexibility allows the roller  2  to become self-aligned with respect to the belt  8  while giving the platform freedom to rotate to a limited degree to the left and right, as well as up and down. 
   As shown in  FIGS. 1 and 2 , the linkage  22  may be in the form of a strip  6  of a flexible but stiff material such as spring steel or durable, resilient plastic connected at one end to the platform  1  via a bracket  5  and connected at its other end to the frame  10  of the treadmill  21  with a pin (not shown) passing through hole  7  and a second set of brackets. Any other appropriate connecting arrangement may be employed. If the frame  10  of a particular target treadmill does not provide a suitable fixed anchoring point to easily accommodate connection with linkage  22 , the frame  10  may be coupled to the whole body vibrator through the attachment of one or more removable frame adaptation members  11  to the frame  10 , as shown in  FIG. 3 . These frame adaptation members  11  are positioned to facilitate a more sturdy or convenient connection to the linkage  22 , and their attachment to the frame  10  is effected in any such suitable fashion. 
   During operation, the vibrator  20  is placed in position on the belt  8  of treadmill  21 . A user then climbs on top of platform  1  of the device  20  while using handles  9  to maintain their balance. The user may then activate the belt  8  of the treadmill  21  just as they would if the treadmill  21  were to be used for walking or running. The motion of the belt  8  then frictionally drives and rotates the roller  2  while any longitudinal movement of the vibrator  20  is restricted through the linkage  22 . 
   As the roller  2  rotates under the force of belt  8 , the eccentrically positioned shaft  4 , moving eccentrically with respect to the roller  2 , imparts vertical oscillatory motion to the platform  1 . As the speed of the belt  8  is gradually increased, the frequency of the oscillations is increased and the user, standing atop the platform  1 , is vibrated with increased frequency and intensity. The user may continue to use handles  9  to maintain balance and may adjust the speed of belt  8  to produce a desired frequency of vibration. 
   The whole body vibrator  20  may be provided with a means to display useful information such as the frequency of vibration, the rate of rotation of the roller  2 , or other such information to a user. This information may be measured with the arrangement shown in  FIG. 4 . Here a magnet  13  fixed to the roller  2  rotates with the roller  2  and, through its magnetic flux, induces a signal in a magnetic sensor  14  positioned either on the platform  1  or bearing housing  3 . Every time the roller  2  completes a rotation, the sensor  14  produces an electrical signal and delivers it to decoder  16 . The decoder  16  then processes the input and provides a display  15  with a signal such that relevant information such as frequency, rotational speed, or the duration of vibration may be displayed to the user. Other optical or contact based tachometers may be alternatively used to make similar measurements and provide a signal to the display  15 . 
   Another possible modification includes cladding the roller  2  with a resilient layer, such as a sleeve  23 , as shown in  FIG. 5 . The resilient sleeve  23  acts as a cushion to minimize noise and to distribute the load more evenly on the belt  8  and the belt substrate of the treadmill  21 . It also serves to increase the friction present between the roller  2  and the belt  8  and reduce slipping while the belt  8  drives the roller  2 . 
   CONCLUSION 
   The foregoing has constituted a description of specific embodiments showing how the invention may be applied and put into use. These embodiments are only exemplary. The invention in its broadest, and more specific aspects, is further described and defined in the claims which now follow. 
   These claims, and the language used therein, are to be understood in terms of the variants of the invention which have been described. They are not to be restricted to such variants, but are to be read as covering the full scope of the invention as is implicit within the invention and the disclosure that has been provided herein.