Abstract:
The dual eccentric motorcycle footrest provides an infinitely and continuously adjustable motorcycle footrest within a defined area on the side of a motorcycle. It may be adjusted in both a vertical and horizontally direction to satisfy the needs of motorcycle operators with various statures, whether on a racetrack or on streets. Normally used in pairs, one for each side of a motorcycle, the invention relies on two eccentric adjustments to provide a reliable, lightweight, strong, durable and easily adjustable motorcycle enhancement.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS  
       [0001]    This application is a continuation-in-part of U.S. patent application Ser. No. 09/836,812 filed on Apr. 17, 2001. 
     
    
     
       BACKGROUND OF INVENTION  
         [0002]    The invention relates generally to the field of motorcycle parts and components, and more particularly to devices that provide durable, lightweight motorcycle footrests having adjustable footrest positions.  
           [0003]    Motorcycles are generally delivered from a manufacturer to a purchaser with footrests having fixed positions with respect to the motorcycle frame. One footrest is located on one side of the motorcycle for convenience of shifting gears with one foot of the operator. Another footrest is located on another side of the motorcycle for convenience of operating brakes with the other foot of the operator. There are several reasons for desiring to adjust the position of the footrest locations that are different from the fixed stock positions provided by a manufacturer. The stock positions may be undesirable due to the physical stature of the motorcycle operator. Because of the operator&#39;s physical stature, the stock positions may be either too high or too low, and either too far forward or too far rearward. When racing motorcycles, it is often desirable to move the footrests higher and rearward due to the extreme lean angles achieved on closed course racetracks. There is a direct relationship between the lean angle of a motorcycle and its achievable speed when traveling through a given arc when encountering a turn. Higher speeds require greater lean angles. If footrests are positioned too low, they may strike the ground at extreme lean angles, creating a hazard for the motorcycle operator and a potential for crashing. This possibility limits the maximum motorcycle speed when encountering a turn or corner. By adjusting the footrests to a higher position, a motorcycle operator can carry more speed through corners and turns due to greater achievable lean angles. However, when footrests are raised to accommodate extreme lean angles, they must also be adjusted rearward in order to bring the operators&#39; knees down and align the operators&#39; feet in such a way to provide easy actuation of the gearshift and brake foot controls of the motorcycle.  
           [0004]    Each motorcycle operator will have a unique opinion about how far up and how far back the footrests should be placed to achieve a comfortable and functional positioning of the footrest on the motorcycle. When riding on public streets at speeds where the clearance between the motorcycle footrests and the ground is not an issue, the motorcycle operator may wish to place the footrests in a lower and further forward position to achieve a more comfortable arrangement. When considering these issues and the variables involved, it is apparent that it would be advantageous to be able to position the footrests in infinitely adjustable horizontal and vertical increments to meet the specific requirements of the motorcycle operator. A further advantage would be providing a method for locking the adjusted position of each footrest with a single tightening means. Furthermore, the footrests should have sufficient strength, durability and ease of adjustment to withstand the environments encountered in motorcycle operation, including closed course racetracks. Existing footrests suffer from a restricted range of adjustment.  
         SUMMARY OF INVENTION  
         [0005]    The present invention includes an apparatus and method for providing motorcycle footrests that have continuous and infinite adjustability over a wide range to accommodate the needs of motorcycle operators of various physical statures. The invention provides both horizontal and vertical adjustability with respect to a frame of a motorcycle. The invention is also capable of satisfying the needs of motorcycle operators whether riding on a racetrack or on public streets and highways. The invention provides footrests that are constructed of materials and in such a fashion to be strong, lightweight, durable and easily adjustable. Embodiments of the invention are capable of being locked into position by tightening a single screw on each footrest.  
           [0006]    The invention provides durable, lightweight motorcycle footrests having two overlapping eccentric axis of rotation for adjusting footrest position. The footrest position of the present invention provides infinite and continuous adjustability in a vertical and horizontal position with respect to a motorcycle frame within the limits defined by two concentric circles offset from centers of rotation.  
           [0007]    An embodiment of the present invention is a method of a dual eccentric adjustable motorcycle footrest that comprises the steps of fastening a bracket having a circular bracket aperture to a motorcycle frame, rotationally adjusting an angular position of a circular collet placed within the circular bracket aperture, the circular collet having an eccentrically offset collet aperture with respect to a circular collet rotational axis, rotationally adjusting an angular position of a foot peg with respect to a foot peg pivot placed within the offset collet aperture, the foot peg having an eccentrically offset positional relationship with respect to a foot peg pivot rotational axis, and fixing an adjusted position of the foot peg by securing the angular position of the collet in the bracket aperture and the angular position of the foot peg pivot in the collet aperture. The step of fixing an adjusted position may comprise providing a slot in the bracket for enabling a friction fit between the bracket aperture and the collet by reducing a diameter of the bracket aperture, providing a slot in the collet for enabling a friction fit between the collet aperture and the foot peg pivot by reducing a diameter of the collet aperture, and tightening a single securing screw through the bracket slot for creating a friction fit between the bracket aperture and the collet by reducing the diameter of the bracket aperture, and for creating a friction fit between the collet aperture and the foot peg pivot by reducing the diameter of the collet aperture. The step of fixing an adjusted position may comprise providing a slot in the collet for enabling a friction fit between the collet and bracket aperture by increasing a diameter of the collet, creating a counter bored hole along the foot peg pivot axis, the counter bored hole having a slot machined in a side wall parallel to the foot peg pivot axis for increasing a diameter of the foot peg pivot, and inserting a single threaded fastener into the counter bored hole and threading the threaded fastener into a tapered nut, causing the slotted counter bored hole in the foot peg pivot to expand for securing the angular position of the foot peg pivot in the collet aperture and securing the angular position of the collet in the bracket aperture. The method may further comprise providing a slot in the bracket for enabling a friction fit between the bracket aperture and the collet by reducing a diameter of the bracket aperture, and tightening a securing screw through the bracket slot for creating a friction fit between the bracket aperture and the collet by reducing the diameter of the bracket aperture. The step of fixing an adjusted position may comprise providing a slot in the bracket for enabling a friction fit between the bracket aperture and the collet by reducing a diameter of the bracket aperture, providing a slot in the collet for enabling a clamping fit between the collet aperture and the foot peg pivot by reducing a diameter of the collet aperture, machining a spline in the collet aperture and a matching spline on the foot peg pivot, and tightening a single securing screw through the bracket slot for creating a friction fit between the bracket aperture and the collet by reducing the diameter of the bracket aperture, and for creating a clamping fit between the collet aperture and the foot peg pivot by reducing the diameter of the collet aperture. The method may further comprise tapping a threaded hole in the foot peg pivot, and tightening a threaded fastener through the collet aperture into the foot peg pivot tapped hole for creating a clamping fit between the collet and the foot peg pivot. The method may further comprise fastening a right hand dual eccentric motorcycle footrest to a right hand side of a motorcycle and fastening a left hand dual eccentric motorcycle footrest to a left hand side of a motorcycle. The method may further comprise adjusting a vertical and horizontal position of the foot peg by rotationally adjusting the angular position of the circular collet and the angular position of the foot peg pivot.  
           [0008]    Another embodiment of the present invention is a method of a dual eccentric adjustable motorcycle footrest that comprises the steps of fastening a bracket having a circular bracket aperture with a bracket aperture centerline to a motorcycle frame, inserting a circular collet having a collet axis and an eccentrically offset collet aperture with a collet aperture centerline into the circular bracket aperture, the collet axis aligning with the bracket aperture centerline, sliding a foot peg pivot having a foot peg pivot axis into the offset collet aperture, the foot peg pivot axis aligning with the collet aperture centerline, eccentrically offsetting a foot peg having a foot peg centerline from the foot peg pivot by a foot peg radial arm fixed between the foot peg and the foot peg pivot, the foot peg centerline being eccentrically offset from the foot peg pivot axis, eccentrically adjusting the position of the foot peg by rotating the collet about the collet axis in the bracket aperture and by rotating the foot peg pivot about the foot peg pivot axis in the collet aperture, and fixing the angular position of the collet in the bracket aperture and the angular position of the foot peg pivot in the collet aperture. The method may further comprise adjusting a vertical and horizontal position of the foot peg by rotationally adjusting the angular position of the circular collet and the angular position of the foot peg pivot. The method may further comprise defining a first eccentric offset as the difference between the a first axis of rotation comprising the collet axis and a second axis of rotation comprising the foot peg axis, defining a second eccentric offset as the difference between the second axis of rotation comprising the foot peg axis and the foot peg centerline, vertically and horizontally adjusting the position of the foot peg over an area outside of an inner concentric circle centered on the collet axis, the inner concentric circle having a radius of the difference the first eccentric offset and the second eccentric offset, and vertically and horizontally adjusting the position of the foot peg over an area inside of an outer concentric circle centered on the collet axis, the outer concentric circle having a radius of the sum the first eccentric offset and the second eccentric offset. The step of fixing an angular position may comprise providing a slot in the bracket for enabling a friction fit between the bracket aperture and the collet by reducing a diameter of the bracket aperture, providing a slot in the collet for enabling a friction fit between the collet aperture and the foot peg pivot by reducing a diameter of the collet aperture, and tightening a single securing screw through the bracket slot for creating a friction fit between the bracket aperture and the collet by reducing the diameter of the bracket aperture, and for creating a friction fit between the collet aperture and the foot peg pivot by reducing the diameter of the collet aperture.  
           [0009]    Yet another embodiment of the present invention is a dual eccentric adjustable motorcycle footrest apparatus that comprises a bracket having a circular aperture fastened to a motorcycle frame, a rotatable circular collet placed within the circular bracket aperture, the circular collet having an eccentrically offset collet aperture with respect to a circular collet rotational axis, a foot peg rotatable with respect to a foot peg pivot placed within the collet aperture, the foot peg having an eccentrically offset positional relationship with respect to a foot peg pivot rotational axis, and means for fixing an adjusted position of the foot peg by securing an angular position of the collet in the bracket aperture and an angular position of the foot peg pivot in the collet aperture. The apparatus may further comprise a first eccentric offset comprising a distance between the circular collet rotational axis and a collet aperture center, and a second eccentric offset comprising a distance between the foot peg pivot rotational axis and a centerline of the eccentrically offset foot peg. The foot peg may be adjustable vertically and horizontally over a region defined by an area between an inner concentric circle centered at the circular collet axis of rotation and an outer concentric circle centered at the circular collet axis of rotation, the inner concentric circle having a radius of the difference between first eccentric offset and the second eccentric offset, and the outer concentric circle having a radius of the sum of first eccentric offset and the second eccentric offset. The inner concentric circle may be defined as that circumscribed by the foot peg centerline during a 360° rotation of the rotatable circular collet with the foot peg centerline in a position as close as possible to the center of rotation of the rotatable circular collet, and the outer concentric circle may be defined as that circumscribed by the foot peg centerline during a 360° rotation of the rotatable circular collet with the foot peg centerline in a position as far as possible from the center of rotation of the rotatable circular collet. The bracket may include a slot that is contracted when a securing screw is tightened into a threaded hole for fixing a position of the rotatable circular collet, and the rotatable circular collet may include a slot that is contracted when the securing screw is tightened into the threaded hole for fixing the position of the foot peg. The rotatable foot peg pivot may be fixed in a position using a splined collet aperture and a matching spline on the rotatable foot peg pivot. The rotatable foot peg pivot may be fixed in position using a threaded fastener and a tapered nut.  
           [0010]    Another embodiment of the present invention is a dual eccentric adjustable motorcycle footrest kit capable of being assembled in the field, that comprises a bracket having a circular aperture adapted to be fastened to a motorcycle frame, a rotatable circular collet adapted to be placed within the circular bracket aperture, the circular collet having an eccentrically offset collet aperture with respect to a circular collet rotational axis, a foot peg rotatable with respect to a foot peg pivot adapted to be placed within the collet aperture, the foot peg having an eccentrically offset positional relationship with respect to a foot peg pivot rotational axis, and means adapted for fixing an adjusted position of the foot peg by securing an angular position of the collet in the bracket aperture and an angular position of the foot peg pivot in the collet aperture.  
         DESCRIPTION OF NUMERIC REFERENCES OF INVENTION EMBODIMENTS  
         [0011]    [0011] 100 . Right hand dual eccentric motorcycle footrest of the present invention  
           [0012]    [0012] 200 . Left hand dual eccentric motorcycle footrest of the present invention  
           [0013]    [0013] 105 . Right hand foot peg  
           [0014]    [0014] 205 . Left hand foot peg  
           [0015]    [0015] 109 . Right hand foot peg radial arm  
           [0016]    [0016] 209 . Left hand foot peg radial arm  
           [0017]    [0017] 111 . Right hand foot peg pivot slot  
           [0018]    [0018] 113 . Right hand foot peg pivot  
           [0019]    [0019] 213 . Left hand foot peg pivot  
           [0020]    [0020] 117 . Right hand collet  
           [0021]    [0021] 217 . Left hand collet  
           [0022]    [0022] 121 . Right hand collet aperture  
           [0023]    [0023] 221 . Left hand collet aperture  
           [0024]    [0024] 125 . Right hand collet slot  
           [0025]    [0025] 225 . Left hand collet slot  
           [0026]    [0026] 129 . Right hand bracket  
           [0027]    [0027] 229 . Left hand bracket  
           [0028]    [0028] 133 . Right hand bracket aperture  
           [0029]    [0029] 233 . Left hand bracket aperture  
           [0030]    [0030] 137 . Right hand bracket slot  
           [0031]    [0031] 237 . Left hand bracket slot  
           [0032]    [0032] 141 . Right hand upper bolt hole  
           [0033]    [0033] 241 . Left hand upper bolt hole  
           [0034]    [0034] 143 . Right hand lower bolt hole  
           [0035]    [0035] 243 . Left hand lower bolt hole  
           [0036]    [0036] 149 . Right hand securing screw in a threaded hole  
           [0037]    [0037] 249 . Left hand securing screw in a threaded hole  
           [0038]    [0038] 153 . Right hand foot peg centerline  
           [0039]    [0039] 155 . Right hand foot peg pivot axis and collet aperture centerline  
           [0040]    [0040] 157 . Right hand collet axis and bracket aperture centerline  
           [0041]    [0041] 159 . Right hand collet direction and field of rotation  
           [0042]    [0042] 161 . Right hand foot peg direction and field of rotation  
           [0043]    [0043] 171 . Right hand threaded fastener  
           [0044]    [0044] 173 . Right hand tapered nut  
           [0045]    [0045] 175 . Right hand foot peg splined pivot  
           [0046]    [0046] 177 . Right hand collet splined aperture  
           [0047]    [0047] 179 . Washer 
       
    
    
     BRIEF DESCRIPTION OF DRAWINGS  
       [0048]    These and other features, aspects and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings wherein:  
         [0049]    [0049]FIG. 1 shows a plane view of the left side of a typical motorcycle depicting the position of the present invention with reference to the motorcycle frame, seat and handlebars;  
         [0050]    [0050]FIG. 2 shows an expanded view of a portion of FIG. 1 depicting the preset invention;  
         [0051]    [0051]FIG. 3 shows an embodiment of the present invention and depicts its use with respect to a motorcycle operator&#39;s boot and an independent control arm;  
         [0052]    [0052]FIG. 4 shows an embodiment of the present invention and depicts its use with respect to a motorcycle operator&#39;s boot and an integrated control arm;  
         [0053]    [0053]FIG. 5 shows a perspective view of an embodiment of the present invention depicting both right hand side and left hand side footrest assemblies;  
         [0054]    [0054]FIG. 6 shows a perspective view of an embodiment of a right hand footrest in a disassembled condition;  
         [0055]    [0055]FIG. 7 shows a perspective view of an embodiment of an assembled collet and bracket;  
         [0056]    [0056]FIG. 8 shows a perspective view of an embodiment of a right hand footrest in an assembled condition;  
         [0057]    [0057]FIG. 9 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on a single threaded fastener and a tapered nut for fixing position of the footrest;  
         [0058]    [0058]FIG. 10 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on two threaded fasteners and a tapered nut for fixing position of the footrest;  
         [0059]    [0059]FIG. 11 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on a single threaded fastener, a splined pivot and a splined hole for fixing position of the footrest;  
         [0060]    [0060]FIG. 12 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on two threaded fasteners, a splined pivot and a splined hole for fixing position of the footrest; and  
         [0061]    [0061]FIG. 13 shows an area of foot peg adjustability between an outer concentric circle and an inner concentric circle, where the diameters of the concentric circles are determined by the sum and difference, respectively, of a first eccentric offset and a second eccentric offset. 
     
    
     DETAILED DESCRIPTION  
       [0062]    Turning now to FIG. 1, FIG. 1 shows a plane view of the left side of a typical motorcycle  10  depicting the position of the present invention of a dual eccentric motorcycle footrest  200  with reference to the motorcycle frame  600 , seat  700  and handlebars  800 . The dual eccentric motorcycle footrest  200  is intended to be used by a motorcycle operator rather than by a motorcycle passenger. Also shown in FIG. 1 is a common configuration of a shift control lever  500 , which is operated in association with the dual eccentric footrest  200 , but is not part of the present claimed invention. In a typical motorcycle configuration, there is also a right side dual eccentric footrest that is a mirror image of the left side footrest  200  shown in FIG. 1. While a left side footrest is generally used in association with a shift control mechanism, a right side footrest is generally used in association with a brake control mechanism.  
         [0063]    Turning now to FIG. 2, FIG. 2 shows an expanded view of a portion of FIG. 1 depicting the preset invention of a dual eccentric motorcycle footrest  200  attached to a motorcycle  12 . The dual eccentric motorcycle footrest  200  is securely mounted to the frame  600  of the motorcycle  12  by threaded fasteners  400  positioned in an upper bolt hole  241  and a lower bolt hole  243  of the dual eccentric motorcycle footrest  200 . An operator of the motorcycle  12  positions a left boot on a foot peg  205  of the dual eccentric motorcycle footrest  200 . When operating the shift control lever  500 , a motorcycle operator positions the left boot to contact a shift control peg  505 , causing the shift control lever  500  to incrementally rotate about a shifter shaft  510  connected to a motorcycle transmission. A similar arrangement is positioned on the right side of the motorcycle  12  for actuating a braking mechanism.  
         [0064]    Turning now to FIG. 3, FIG. 3A shows an embodiment of the present invention comprising a left hand dual eccentric motorcycle footrest  200 . The left hand dual eccentric motorcycle footrest  200  has a foot peg  205 , an upper bolt hole  241  and a lower bolt hole  243 . Although not part of the claimed invention, FIG. 3A also shows a shift control lever  500  rotatably mounted to a shifter shaft  510  of a motorcycle. The shift control lever  500  has a shift control peg  505  mounted on an opposite end from the shifter shaft  510 . FIG. 3B depicts the position of a left boot  900  of a motorcycle operator in a normal riding position with the ball of the foot on the foot peg  205  of the dual eccentric motorcycle footrest  200  securely mounted on the motorcycle frame  600 . Also shown in FIG. 3B is the shift control peg  505  mounted on the shift control lever  500  connected to the shifter shaft  510 . FIG. 3C depicts the position of the boot  900  of a motorcycle operator moved forward in a position to enable the toe of the boot  900  to move the shift control peg  505  up and down. This moves the shift control lever  500  such that the shifter shaft  510  incrementally rotates, causing the motorcycle transmission to shift gears. Although an embodiment of the claimed invention shown in FIG. 3A, FIG. 3B and FIG. 3C illustrate how the claimed invention may be used in association with control mechanisms  500 ,  505 ,  510  of a motorcycle, the control mechanisms  500 ,  505 ,  510  are not part of the claimed invention.  
         [0065]    Turning now to FIG. 4, FIG. 4A shows another embodiment of the present invention comprising a left hand dual eccentric motorcycle footrest  200 . The left hand dual eccentric motorcycle footrest  200  has a foot peg  205 , an upper bolt hole  241  and a lower bolt hole  243 . Although not part of the claimed invention, FIG. 4A also shows a shift control lever  550  rotatably mounted at a base of the foot peg  205 . The shift control lever  550  has a shift control peg  555  and a shift linkage hole  557  for connection to a shifter shaft of a motorcycle transmission. FIG. 4B depicts the position of a left boot  900  of a motorcycle operator in a normal riding position with the ball of the foot on the foot peg  205  of the dual eccentric motorcycle footrest  200  securely mounted on the motorcycle frame  600 . Also shown in FIG. 4B is the shift control peg  555  mounted on the shift control lever  550  connected to a shifter shaft  560  by a shift linkage  570  connected between the linkage hole  557  and the shifter shaft  560 . FIG.  4 C depicts the position of the left boot  900  of a motorcycle operator moved forward in a position to enable the toe of the boot  900  to move the shift control peg  555  up and down. This moves the shift control lever  550  such that the shift linkage  570  connected between the linkage hole  557  and the shifter shaft  560  causes the shifter shaft  560  to incrementally rotate, causing the motorcycle transmission to shift gears. Although an embodiment of the claimed invention shown in FIG. 4A, FIG. 4B and FIG. 4C illustrate how the claimed invention may be used in association with control mechanisms  550 ,  555 ,  557 ,  560 ,  570  of a motorcycle, the control mechanisms  550 ,  555 ,  557 ,  560 ,  570  are not part of the claimed invention.  
         [0066]    Turning now to FIG. 5, FIG. 5A shows a perspective view of an embodiment of the present invention depicting a right hand side footrest assembly  100  and FIG. 5B shows a perspective view of an embodiment of the present invention depicting a left hand side footrest assembly  200 . FIG. 5A shows an embodiment of the present invention  100  suitable for attachment to the right side of a motorcycle frame by fastening means inserted into a right hand upper bolt hole  141  and a right hand lower bolt hole  143 . FIG. 5B shows an embodiment of the present invention  200  suitable for attachment to the left side of a motorcycle frame by fastening means inserted into a left hand upper bolt hole  241  and a left hand lower bolt hole  243 . In normal use, it is anticipated that a motorcycle operator will prefer to use a left hand version and a right hand version for each side of a motorcycle for supporting a left foot and a right foot, respectively. The right hand version and the left hand version are typically mirror images of one another. The invention may be assembled from machined, fabricated or cast components. The component materials may be selected from various materials, including but not limited to magnesium, titanium, aluminum, steel or carbon fiber.  
         [0067]    [0067]FIG. 5A depicts the major components of the right hand dual eccentric footrest  100  of the present invention. A right hand foot peg  105  is offset from its center of rotation by a right hand radial arm  109 . The right hand foot peg  105  and radial arm  109  may eccentrically rotate about a center of rotation comprising the center of a right hand foot peg pivot (not shown) centered in an offset right hand collet aperture (not shown) in a right hand collet  117 . The right hand collet  117  has a right hand collet slot  125  that enables tightening of the collet slot  125  to frictionally fix an angular position of the right hand foot peg  105 , the right hand foot peg radial arm  109 , and the right hand foot pivot (not shown) in the right hand collet aperture (not shown). Furthermore, the right hand collet aperture (not shown), the right hand foot peg radial arm  109  and the right hand foot peg  105  may also eccentrically rotate about a center of rotation comprising the center of the right hand collet  117 . The right hand collet  117  may be rotatably positioned within a right hand bracket aperture (not shown) in a right hand bracket  129 . The right hand bracket  129  has a right hand bracket slot  137  and a right hand securing screw in a threaded hole  149 . The right hand securing screw in a threaded hole  149  provides a single position fixing means that enables tightening of the right hand bracket slot  137  to frictionally fix an angular position of the right hand collet  117  within the right hand bracket  129 , and to frictionally fit an angular position of the right hand foot peg  105 , the right hand foot peg radial arm  109 , and the right hand foot pivot (not shown) in the right hand collet aperture (not shown). The right hand bracket  129  includes a right hand upper bolt hole  141  and a right hand lower bolt hole  143  to enable mounting the right hand bracket  129  to a motorcycle frame using suitable fasteners.  
         [0068]    [0068]FIG. 5B depicts the major components of the left hand dual eccentric footrest  200  of the present invention. A left hand foot peg  205  is offset from its center of rotation by a left hand radial arm  209 . The left hand foot peg  205  and radial arm  209  may eccentrically rotate about a center of rotation comprising the center of a left hand foot peg pivot  213  centered in an offset left hand collet aperture  221  in a left hand collet  217 . The left hand collet  217  has a left hand collet slot  225  that enables tightening of the collet slot  225  to frictionally fix an angular position of the left hand foot peg  205 , the left hand foot peg radial arm  209 , and the left hand foot pivot  213  in the left hand collet aperture  221 . Furthermore, the left hand collet aperture  221 , the left hand foot peg radial arm  209  and the left hand foot peg  205  may also eccentrically rotate about a center of rotation comprising the center of the left hand collet  217 . The left hand collet  217  may be rotatably positioned within a left hand bracket aperture  233  in a left hand bracket  229 . The left hand bracket  229  has a left hand bracket slot  237  and a left hand securing screw in a threaded hole  249 . The left hand securing screw in a threaded hole  249  provides a single position fixing means that enables tightening of the left hand bracket slot  237  to frictionally fix an angular position of the left hand collet  217  within the left hand bracket  229 , and to frictionally fit an angular position of the left hand foot peg  205 , the left hand foot peg radial arm  209 , and the left hand foot pivot  213  in the left hand collet aperture  221 . The left hand bracket  229  includes a left hand upper bolt hole  241  and a left hand lower bolt hole  243  to enable mounting the left hand bracket  229  to a motorcycle frame using suitable fasteners.  
         [0069]    Turning to FIG. 6, FIG. 6 shows a perspective view of an embodiment of a right hand footrest  100  in a disassembled condition. To further clarify the description of the present invention, a right hand foot peg centerline  153 , a right hand foot peg pivot axis  155 , and a right hand collet axis and bracket aperture centerline  157  are identified in FIG. 6. To assemble the right hand version of the present invention  100 , the right hand collet  117  is slideably inserted along the right hand collet axis and bracket aperture centerline  157  into the right hand bracket aperture  133  in the right hand bracket  129 . Prior to determining a final eccentrically rotatable position of the right hand collet  117  within the right hand bracket aperture  133 , the right hand collet  117  is rotated about the right hand collet axis and bracket aperture centerline  157  for positioning. Prior to tightening the right hand securing screw in a threaded hole  149  shown in FIG. 6, the right hand foot peg pivot  113  is slideably inserted along the right hand foot peg pivot axis and collet aperture centerline  155  into the right hand collet aperture  121  of the right hand collet  117 . Prior to determining a final eccentrically rotatable position of the right hand foot peg pivot  133  within the right hand collet aperture  121 , the right hand foot peg centerline  153  of the right hand foot peg  105  is rotated about the right hand pivot axis and collet aperture centerline  155  for positioning. Once all component positions of the right hand footrest  100  have been finally determined, a right hand securing screw in a threaded hole  149  is tightened to frictionally secure all components in a fixed position by narrowing the right hand bracket slot  137  and the right hand collet slot  125 .  
         [0070]    Regarding FIG. 6, tightening the right hand securing screw in a threaded hole  149  causes the pinching together of the right hand bracket slot  137 , which in turn causes a reduction of the circumference if the right hand bracket aperture  133 . The reduction in the circumference of the right hand bracket aperture  133  frictionally binds the right hand collet  117  in position within the right hand bracket aperture  133 , and causes pinching together of the right hand collet slot  125 . The pinching together of the right hand collet slot  125  causes a reduction in the circumference of the right hand collet aperture  121 . The reduction in the circumference of the right hand collet aperture  121  frictionally binds the right hand peg pivot  113  in position within the right hand collet aperture  121 . Accordingly, the tightening of a single screw, the right hand securing screw in a threaded hole  149 , causes all components of the dual eccentric motorcycle footrest  100  to frictionally bind together such that adjustability and rotatability of these components relative to one another are fixed.  
         [0071]    Although not shown in FIG. 6, the dual eccentric footrest  100  is generally attached to the frame of a motorcycle by inserting bolts through the right hand bracket upper bolt hole  141  and the right hand bracket lower bolt hole  143  and screwably inserting the bolts into threaded holes in the motorcycle frame. While threaded bolt holes in the motorcycle frame may be obtained by drilling and tapping holes in user selected positions on the motorcycle frame, it is common for the motorcycle manufacturer to provide threaded bolt holes for mounting footrests. Accordingly, numerous variations of positions of the right hand bolt holes  141 ,  143  are possible in order to accommodate the pre-existing positions of the manufacturer&#39;s footrest attachment bolt holes. The position of such footrest attachment bolt holes, whether pre-existing threaded bolt holes provided by the manufacturer or user selected bolt holes are drilled and tapped, is such that the foot peg of the preferred embodiment when installed on the motorcycle will extend perpendicularly from the vertical plane through the center of the upright motorcycle. Therefore, the foot peg of the preferred embodiment, whether the right hand foot  105  or the left hand foot peg  205 , is adjustable in a vertical plane defined by the bracket, either right hand  129  or left hand  229 , which is attached to the frame of an upright motorcycle.  
         [0072]    In FIG. 6, the right hand upper bolt hole  141 , the right hand lower bolt hole  143 , and the right hand collet axis and bracket aperture centerline  157  have a triangle relationship that will necessarily be modified to meet the requirements of each make and model of motorcycle, as dictated by the position of the stock bolt holes and their relationship to the stock footrest position as prearranged by each motorcycle manufacturer. The right hand collet axis is concentric with the bracket aperture centerline  157 , and the right hand foot peg pivot axis and collet aperture centerline  155  is eccentric with the right hand collet axis and bracket aperture centerline  157 . The radial position of the right hand foot peg pivot axis and collet aperture centerline  155  is adjusted within the scope of a circumference defined by the eccentricity of the right hand foot peg pivot axis and collet aperture centerline  155  when rotated about the right hand collet axis and bracket aperture centerline  157 . The right hand foot peg pivot axis is concentric with the collet aperture centerline  155 . The right hand foot peg centerline  153  has an eccentric relationship with the right hand foot peg pivot axis and collet aperture centerline  155 . The radial position of the foot peg  105  is adjusted within the scope of a circumference defined by the eccentricity of the right hand foot peg axis and collet aperture centerline  155  when rotated about the axis of the foot peg pivot.  
         [0073]    Turning now to FIG. 7, FIG. 7 shows a perspective view of an embodiment of an assembled collet and bracket. The present invention is characterized as a dual eccentric motorcycle footrest that provides adjustment of the position of a foot peg over an area covered by two overlapping eccentric circles. The right hand collet  117  is rotatable within the right hand bracket  129  shown in FIG. 7. It provides a first eccentric offset, represented by the offset of the center of the collet aperture from the collet axis, which is rotatable  159  within the right hand bracket aperture  133  over angles of 360°. The angle of rotation of the collet aperture is fixed by tightening the right hand securing screw in a threaded hole  149 .  
         [0074]    Turning to FIG. 8, FIG. 8 shows a perspective view of an embodiment of a right hand footrest in an assembled condition. The right hand foot peg  105  is rotatable  161  within the right hand collet aperture  133  over angles of 360°. It provides a second eccentric offset, represented by the offset of the right hand foot peg centerline  153  from the right hand foot peg pivot axis and collet aperture centerline  155 . The length of the right hand foot peg radial arm  109  determines the second offset. Thus, the position of the right hand footrest  105  may be adjusted continuously over the area defined as the area concentric with both the right hand bracket aperture centerline  157  and the right hand collet aperture centerline  155 . This area may be represented by an area between concentric circles having different diameters, where an outer boundary diameter is equal to the sum of the right hand foot peg offset (second offset) and the right hand collet aperture offset (first offset), and the inner boundary diameter is equal to the difference between the right hand foot peg offset (second offset) and the right hand collet aperture offset (first offset). The first and second offsets may be chosen such that the difference between the two offsets is zero, or a positive or negative number. In an embodiment, the difference between the two offsets is zero, so that the adjustment range of the right hand foot peg may be made vertically and horizontally over all positions within the area defined by the sum of the offsets, as described above.  
         [0075]    Turning now to FIG. 9, FIG. 9 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on a single threaded fastener and a tapered nut for fixing position of the footrest. In this embodiment of the present invention, a right hand foot peg centerline  153 , a right hand foot peg pivot axis  155 , and a right hand collet axis and bracket aperture centerline  157  are identified. To assemble the right hand version of this embodiment of the present invention, the right hand collet  117  is slideably inserted along the right hand collet axis and bracket aperture centerline  157  into the right hand bracket aperture  133  in the right hand bracket  129 . Prior to determining a final eccentrically rotatable position of the right hand collet  117  within the right hand bracket aperture  133 , the right hand collet  117  is rotated about the right hand collet axis and bracket aperture centerline  157  for positioning. The right hand foot peg pivot  113  is slideably inserted along the right hand foot peg pivot axis and collet aperture centerline  155  into the right hand collet aperture  121  of the right hand collet  117 . Prior to determining a final eccentrically rotatable position of the right hand foot peg pivot  113  within the right hand collet aperture  121 , the right hand foot peg centerline  153  of the right hand foot peg  105  is rotated about the right hand pivot axis and collet aperture centerline  155  for positioning of the right hand foot peg. Once all component positions of the right hand footrest have been finally determined, a right hand securing screw  171  is inserted into a slotted tapered hole  111  in the right hand foot peg pivot  113 , which is positioned within the right hand collet aperture  121  having a slot  125 . A tapered nut  173  is screwed into the securing screw  171  in the back side if the slotted hole  111 . When the slotted nut  173  is tightened, the slotted hole  111  is caused to expand, further causing the slotted right hand collet aperture  121  to expand. This expansion causes a friction fit between the right hand foot peg pivot  113 , the right hand collet aperture  121  and the right hand bracket aperture  133 . This friction fit causes the components of the right hand dual eccentric motorcycle footrest to be securely fixed in a selected position using a single fastening mechanism.  
         [0076]    Turning now to FIG. 10, FIG. 10 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on two threaded fasteners and a tapered nut for fixing position of the footrest. This footrest component configuration is the same as described in FIG. 9, but has the additional right hand securing nut in a threaded hole, as described in FIG. 6. For brevity, a description of this combination of two embodiments described above will not be repeated.  
         [0077]    Turning now to FIG. 11, FIG. 11 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on a single threaded fastener, a splined pivot and a splined hole for fixing position of the footrest. In this embodiment of the present invention, a right hand foot peg centerline  153 , a right hand foot peg pivot axis  155 , and a right hand collet axis and bracket aperture centerline  157  are identified. To assemble the right hand version of this embodiment of the present invention, the right hand collet  117  is slideably inserted along the right hand collet axis and bracket aperture centerline  157  into the right hand bracket aperture  133  in the right hand bracket  129 . Prior to determining a final eccentrically rotatable position of the right hand collet  117  within the right hand bracket aperture  133 , the right hand collet  11   7  is rotated about the right hand collet axis and bracket aperture centerline  157  for positioning. The splined right hand foot peg pivot  175  is slideably inserted along the right hand foot peg pivot axis and collet aperture centerline  155  into the splined right hand collet aperture  177  of the right hand collet  117 . Prior to determining a final eccentrically rotatable position of the splined right hand foot peg pivot  175  within the splined right hand collet aperture  177 , the right hand foot peg centerline  153  of the right hand foot peg  105  is rotated about the right hand pivot axis and collet aperture centerline  155  for positioning of the right hand foot peg  105 . The spline of the splined right hand foot peg pivot  175  matches the spine of the splined right hand collet aperture  177 . Once all component positions of the right hand footrest have been finally determined, a right hand securing screw in a threaded hole  149  is tightened, causing a contraction of the right hand bracket slot  137  and providing a fixed friction fit between the right hand bracket aperture  133  and the right hand collet  117 , securely fixing the angular position of the right hand collet  117  in the right hand bracket aperture  133 . The tightening of the right hand securing screw in a threaded hole  149  also causes the right hand collet slot  125  to contract, causing the spline of the splined right hand foot peg pivot  175  to fixably engage the spline of the splined right hand collet aperture  177 , and causing a friction fit between the splined right hand foot peg pivot  175  and the splined right hand collet aperture  177 . This securely fixes the position of the splined right hand peg pivot  175 , and thus the right hand foot peg  105 , in the splined right hand collet aperture  177 . This friction fit causes the components of the right hand dual eccentric motorcycle footrest to be securely fixed in a selected position using a single fastening mechanism.  
         [0078]    Turning now to FIG. 12, FIG. 12 shows a perspective view of an embodiment of a disassembled right hand footrest that relies on two threaded fasteners, a splined pivot and a splined hole for fixing position of the footrest. In this embodiment of the present invention, a right hand foot peg centerline  153 , a right hand foot peg pivot axis  155 , and a right hand collet axis and bracket aperture centerline  157  are identified. To assemble the right hand version of this embodiment of the present invention, the right hand collet  117  is slideably inserted along the right hand collet axis and bracket aperture centerline  157  into the right hand bracket aperture  133  in the right hand bracket  129 . Prior to determining a final eccentrically rotatable position of the right hand collet  117  within the right hand bracket aperture  133 , the right hand collet  117  is rotated about the right hand collet axis and bracket aperture centerline  157  for positioning. The splined right hand foot peg pivot  175  is slideably inserted along the right hand foot peg pivot axis and collet aperture centerline  155  into the splined right hand collet aperture  177  of the right hand collet  117 . Prior to determining a final eccentrically rotatable position of the splined right hand foot peg pivot  175  within the splined right hand collet aperture  177 , the right hand foot peg centerline  153  of the right hand foot peg  105  is rotated about the right hand pivot axis and collet aperture centerline  155  for positioning of the right hand foot peg  105 . The spline of the splined right hand foot peg pivot  175  matches the spline of the splined right hand collet aperture  177 . Once all component positions of the right hand footrest have been finally determined, a right hand securing screw in a threaded hole  149  is tightened, causing a contraction of the right hand bracket slot  137  and providing a fixed friction fit between the right hand bracket aperture  133  and the right hand collet  117 , securely fixing the angular position of the right hand collet  117  in the right hand bracket aperture  133 . By tightening of a right hand footrest threaded fastener  171  into a threaded hole in the splined right hand foot peg pivot  175 , a friction fit is created between the right hand footrest threaded fastener  171 , the washer  179  and the splined right hand foot peg pivot  175 , causing the spline of the splined right hand foot peg pivot  175  to fixably engage the spline of the splined right hand collet aperture  177 . This securely fixes the position of the splined right hand peg pivot  175 , and thus the right hand foot peg  105 , in the splined right hand collet aperture  177 . This friction fit causes the components of the right hand dual eccentric motorcycle footrest to be securely fixed in a selected position using two fastening mechanism.  
         [0079]    It should also be noted that the present invention of a dual eccentric motorcycle footrest relies on two eccentric axes that are each offset from a geometrical center of rotation, as illustrated in FIG. 6 through FIG. 12. As illustrated in FIG. 13, the first eccentric offset  187  is represented by the difference between the first axis of rotation, comprising the right hand collet axis and bracket aperture centerline  157 , and a second center of rotation comprising the right hand foot peg axis and collet aperture centerline  155 . The second eccentric offset  1   89  is represented by the difference between the right hand foot peg axis and collet aperture centerline  155  and the right hand foot peg centerline  153 . These two eccentric offsets enable two independent rotational adjustments of the footrest components for positioning of the right hand foot peg within the area defined between the perimeter of an inner circle  191  and an outer circle  193 , as shown in FIG. 13. The diameter of the outer concentric circle  183  is determined by the sum of the first eccentric offset  187  and second eccentric offset  189  while the diameter of the inner concentric circle  185  is determined by the difference between the first eccentric offset  187  and second eccentric offset  189 .  
         [0080]    Note that since the left hand dual eccentric footrest is a mirror image of the right hand dual eccentric footrest, a detailed description of the left hand dual eccentric footrest in addition to the present description of the right hand dual eccentric footrest is not deemed necessary to an understanding of the present invention.  
         [0081]    Although the present invention has been described in detail with reference to certain preferred embodiments, it should be apparent that modifications and adaptations to those embodiments might occur to persons skilled in the art without departing from the spirit and scope of the present invention.