Abstract:
An adjustable gearshift pedal lever for motorcycles and the like designed for attachment to a shift arm. The lever may be designed in a variety of offset lengths that allow for an increase or decrease between the lever and the motorcycle footpeg. In addition, the lever may be raised or lowered vertically by the use of shims selectively placed between the shift arm and the gearshift pedal lever.

Description:
BACKGROUND 
   1. Technical Field 
   The invention relates to gearshift pedal assemblies for motorcycles. 
   2. Description of Prior Art 
   A standard motorcycle gearshift pedal assembly is typically a four-part lever device, made up of the gearshift pedal arm, the gearshift pedal lever, the gearshift pedal lever connecting rivet and the gearshift pedal lever spring. The device is mounted in a stock position and is used for manually shifting gears by using the foot to lift or lower the position of the lever to the point that the multiple desired drive gears or the neutral position is engaged. Once such engagement is accomplished, the lever is released and automatically returns to its position prior to the ‘shift’ until the next change of gears is desired. This shifting of gears is performed regularly in the process of riding a motorcycle. 
   The gearshift pedal arm is typically about six inches long and curved to fit the specific application, although the length and the shape of the arm varies between manufacturers and models. The gearshift pedal arm attaches to the engine by connection to the gearshift spindle. The gearshift spindle is a rod with a splined end for attachment to the gearshift pedal arm. The gearshift spindle is part of the mechanical gearing linkage and is connected to the engine. There are usually splined grooves inside the mounting end, and these grooves must be lined up with matching grooves on the gearshift spindle when the connection is made for ‘stock’ installation position, by sliding the mounting end of the gearshift pedal arm onto the gearshift spindle. 
   The gearshift pedal arm is designed to be lifted up and pushed down manually, thereby rotating the gearshift spindle and causing the drive gears to shift up or down and into the neutral position. The gearshift pedal lever is the contact point for manual shifting with the foot. It typically has a tubular shaped and knurled horizontal knob that protrudes horizontally and outward, typically at 90 degrees, from a connection point at the end of the gearshift pedal arm 
   The gearshift pedal lever is connected to the gearshift pedal arm by the gearshift pedal lever rivet. The gearshift pedal lever rivet is usually a fixed rivet, which connects the gearshift pedal lever to the gearshift pedal arm and holds the gearshift pedal lever spring. This riveted connection does not compress the connection point between the gearshift pedal lever and the gearshift pedal arm. Rather, the rivet acts as a hinge point for the horizontally protruding gearshift pedal lever, allowing it to rotate backward or counterclockwise, typically on the order of 40-45 degrees, in the event of accidental impact, thus reducing the likelihood of breakage of the gearshift pedal assembly or bending of the gearshift pedal arm. The gearshift pedal lever is biased to return to its original position by the gearshift pedal lever spring that is positioned around the gearshift pedal lever rivet. 
   Shifting gears is performed frequently, while both standing and sitting, and ideally the rider should be able to reach the shift lever comfortably reached with his foot from the proper balance position stance on the footpeg. The correct balance position stance is specific for each rider; however there is a generally accepted position for most riding conditions which presumes that each foot is positioned on the footpeg in approximately the same position, with the center portion of the foot resting on the footpeg. This proper stance is ergonomically correct and best for appropriate balance and weight distribution. Indeed, many boot manufacturers provide a replacement sole patch in the center area of the boot as that section of the boot is expected to wear out through constant contact with the footpeg. 
   However, current motorcycles are designed to fit an average-sized person, as determined by the manufacturer. Most manufacturers build motorcycles to fit a male of medium build, 150 to 160 pounds, with size 8-9 feet. In the case of the gearshift pedal assembly, there is an obvious problem with anyone with a foot size much larger or smaller than the average size: since stock gearshift pedal assemblies are not adjustable for length and are positioned at distance from the footpeg predetermined by the manufacturer, a rider with a larger or smaller than average foot may not be able to comfortably or safely operate the shifter from the proper balance position stance on the footpeg. Such riders must adjust their stance by moving one foot forward or back, relative to their other foot, compromising balance and safety. 
   The gearshift pedal assembly may be removed from the gearshift spindle, rotated clockwise or counter clockwise, and replaced it in a different position on the spindle thereby relocating the knob higher or lower than the original stock position. But while it is possible to vertically adjust the position of a stock shift lever in this manner, the adjustment is usually impractical since rotating the distance of just one tooth of adjustment on the spindle typically moves the knob about 10 mm, which is usually greater than desired. This is because the spindle is not specifically designed to be a point of adjustment, but is designed for easy removal and replacement of the lever assembly in the stock position. 
   It is therefore an object of this invention to provide a gearshift pedal level system that is adjustable in the horizontal and/or vertical directions. 
   SUMMARY OF THE INVENTION 
   The invention is directed to a replacement gearshift pedal lever for motorcycles that is adjustable in that it allows the user to modify the distance between the foot peg and the stock shift pedal lever and/or to adjust the height of the shift pedal lever. The replacement pedal lever may preferably be attached to the stock pedal arm by means of a screw assembly, although other means of attachment are possible. Alternatively, the user may replace the stock pedal arm with a pedal arm specifically adapted to receive the replacement gearshift pedal lever. It will be understood that in practice the pedal lever may be designed for cooperation with the pedal arm of a specific model of motorcycle, or, alternatively, an assembly including the pedal lever and a replacement pedal arm may be provided. 
   Replacement pedal levers may be constructed in a variety of offset lengths thus allowing the user to select a lever which creates the desired increase or decrease in the distance between the footpeg and the lever. Typically, most foot sizes may be accommodated with a choice of offsets between −5 mm and +15 mm, although more extreme sizes can be offered, e.g., −10 mm and +20 mm offsets. For levers with positive offset, that is, that increase the distance between the footpeg and the lever, it is advantageous to have an angled portion which allows the lever to avoid hitting the engine or other parts of the motorcycle and maintains an appropriate position between the lever and the footpeg. 
   The pedal lever may be attached to the pedal arm using two wing portions. The wing portions may be positioned with sufficient distance between them so as to allow the wing portions to fit over the cooperating portion of the pedal arm and allow one or more, and preferably two or more, washers or similar shim devices, to be placed between the interior of the wing portions and the pedal arm. By selectively positioning the washers above and/or below the pedal arm, the lever may be raised or lowered allowing for vertical adjustment of the pedal lever. 
   The use and advantages of the invention are more particularly described below. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a replacement pedal lever in accordance with the invention having a positive horizontal offset. 
       FIG. 2  shows a replacement pedal lever in accordance with the invention having a negative horizontal offset. 
       FIG. 3  shows a replacement pedal lever in accordance with the invention having no offset. 
       FIG. 4  shows the replacement pedal lever adjusted vertically downward. 
       FIG. 5  shows the replacement pedal lever adjusted vertically upward. 
       FIG. 6  shows the replacement pedal lever adjusted to a neutral vertical position. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Specifically, the invented system comprises a selectable replacement pedal lever  100 ,  200 ,  300  which may be attached to the stock gearshift pedal arm by means of a removable screw assembly. 
   With reference to  FIGS. 1-3 , the user may select a replacement gearshift pedal lever  100 ,  200 ,  300  with one end  120 ,  220 ,  320  comprising a horizontal knob portion  101 ,  201 ,  301  that, when attached to the gearshift pedal arm by the removable screw assembly of a button screw  420  and shoulder screw  430 , preferably extends at around a 90 degree angle relative to the motorcycle body and approximately parallel to the footpeg. The use of certain gearshift pedal levers  100 ,  200  results in an increase or decrease in the distance between the footpeg and the pedal lever  100 ,  200  relative to the distance between the footpeg and the stock pedal lever. 
   The pedal lever  100 ,  200 ,  300  further comprises a second end,  130 ,  230 ,  330  connected to an attachment section  102 ,  202 ,  302  that generally including two wing portions  103 ,  203 ,  303  that fit over the cooperating portion of the pedal arm and include holes  104 ,  204 ,  304 . The holes  104 ,  204 ,  304  are adapted to accept a screw or other fastener assembly, which may include a button screw  410  and a shoulder screw  420 , and are adapted to align with holes (not shown) formed in the cooperating portion of pedal arm. 
   The knob portion can be viewed as forming a central axis  150 ,  250 ,  350  that runs from the first end of the pedal lever to the second end of the pedal lever. As noted above, the knob portion of these selectable gearshift pedal levers  100 ,  200  when attached for use, have an increased or decreased distanced from the footpeg in comparison with as stock pedal lever. This may be effected by creating a positive horizontal offset  110  or negative horizontal offset  210  of the center of the fastening assembly, in these embodiments the center of the hole  104 ,  204 , by a selected distance from the central axis  150 ,  250  of the knob portion  101 ,  201 . A zero offset will usually result in a replacement pedal lever with the knob portion at essentially the same distance from the footpeg as the stock pedal lever knob. This is shown in  FIG. 3 , where the center of the hole  304  lies on the axis  350 . 
   The replacement pedal levers  100 ,  200 ,  300  may be constructed in a variety of offset lengths. Typically, most foot sizes may be accommodated with a choice of −5 mm, +5 mm, +10 mm and +15 mm offsets, although more extreme sizes can be offered, e.g., −10 mm and +20 mm offsets. It will be understood by a person of ordinary skill in the art that the other offsets may be used. The offset of the center of the fastening assembly may or may not correspond with the exact change in the distance between the footpeg and the pedal lever depending on the shape of the device. Further, a pedal lever  300  with an offset of zero or an offset that results in a distance between the foopeg and the level essentially identical to that when the stock pedal lever is used, may also be offered, as the system further provides for height adjustability. 
   Because of the angle at which the gearshift pedal arm typically extends from the gearshift spindle, it is advantageous for a replacement pedal lever  100 , especially a replacement lever with a positive offset, to include an angled portion  105  such that the position of the horizontal knob portion  101  relative to the motorcycle body and the footpeg is maintained. Additionally, the angled portion  105  allows the pedal lever to avoid hitting the engine or other portions of the motorcycle. It will be understood by persons of ordinary skill in the art that the exact angle of the angled portion  105  will vary depending on the offset selected and construction of the motorcycle. 
   With reference to  FIGS. 4-6 , the holes on the pedal arm will usually be designed to accept a rivet, as most manufacturers&#39; stock pedal levers are attached using a rivet. To attach the pedal lever  400  (which may be any of pedal levers  100 ,  200 ,  300 ) to the pedal arm  410 , the user removes the standard rivet (for example, by drilling) which typically connects the stock pedal lever to the pedal arm  410  and attaches the selected pedal lever  400  to the pedal arm  410  using the removable screw assembly of the button screw  420  and a shoulder screw  430 . When replacing the rivet, the stock spring  450  may be retained and used in the device for the purpose of allowing some rotational flexibility and a return of the knob  401  to the proper position in the event of accidental impact; alternatively, a new spring could be provided for use with the device. 
   The screw assembly shown allows for both replacement of the pedal lever and slight vertical adjustment of the knob  401 , through the use of moveable shims  440 , such as washers. It has been found that even a slight vertical adjustment, on the order of a few millimeters, may have a significant effect on the comfort of the rider. It will be understood, however, that other types of fastener assemblies, including fasteners that are fixedly attached, in whole or in part, to the wing portions, may be used that would also allow for the use of the moveable shims described below. 
   The wing portions  403  are positioned with sufficient distance between them so as to allow the wing portions  403  to fit over the cooperating portion of the pedal arm  410  and allow one or more, preferably two or more, washers or similar shim devices  440 , to be placed between the interior of the wing portions  403  and the pedal arm  410 . The height of the pedal lever  400  may thereby be adjusted by selectively placing the washers or shims  440  above or below the pedal arm  410 . If two shim devices  440  are used, placing both washers below the pedal arm, as shown in  FIG. 4 , will raise the pedal lever  400 ; placing both washers above the pedal arm, as shown in  FIG. 5 , will lower the pedal lever  400 . Alternatively, one washer may be placed above and one washer below the pedal arm to maintain the stock horizontal position, as shown in  FIG. 6 . When using two washers, there are three position options. It will be appreciated that fewer or more washers can be used with an associated increase or decrease in the number of vertical positions possible. When using four washers, for example, there are five position options. 
   The pedal levers may be constructed of appropriate material known to persons of ordinary skill in the art, for example, appropriate grades of steel or aluminum. In one embodiment, billet aluminum has been used successfully. The pedal levers and other portions of the system may also be durably color coded through an annealing process to allow immediate identification of, for example, the manufacturer for which the replacement system is intended, the particular offset, or other pertinent information. 
   While the present invention has been shown and described with reference to the foregoing preferred embodiment, it will be apparent to those skilled in the art that changes in form, connection, and detail may be made therein without departing from the spirit and scope of the invention as defined in the appended claims: