Two-purpose-pedal

Abstract

A two-purpose-pedal consists of a shaft or spindle adopted to attach to a crank-arm using one longitudinal side, a pedal body rotatably attached to the other longitudinal side of said pedal shaft, and two parallel straight holes on said pedal body sandwich said pedal shaft in the middle. Each of the said two parallel straight holes is designed to tightly fit the base of a particular instep-coupler and can be disjoined by space in between. Said two straight holes can either parallel to or perpendicular to said pedal shaft. The former require the two holes be entered from the back side of said pedal body and exit with flat surface surround the end of holes, said flat surfaces are perpendicular to the direction of the holes. The latter required the two holes located near the back side of said pedal body with flat surfaces surrounding both ends of the holes, said flat surfaces are perpendicular to the direction of the hole.

1 . A two-purpose-pedal is a pedal that function as a receiver for sole pushing mechanism and function as a host to receive an instep-coupler attachment, said two-purpose-pedal comprising:
 a) a pedal shaft or spindle adopted to attach to a crank-arm using one longitudinal side,   b) a pedal body rotatably attach to the other longitudinal side of said pedal shaft, and   c) two straight holes on said pedal body, sandwich said pedal shaft in the middle, having the size and the shape of the cross-section of a small or medium size chop-stick, said cross-section is perpendicular to the lengthwise of said chop-stick, and each of said straight holes can be disjoined with space in between.   
   
   
       2 . The two-purpose-pedal of  claim 1  wherein said two straight holes have their entrances located at the back side of said pedal body and run toward the front side of said pedal body; said back side of said pedal body is the side of said pedal body that is facing a crank-arm and said front said of said pedal body is the side said pedal that is farthest away from said crank-arm when said two-purpose-pedal is attached to said crank-arm using said pedal shaft. 
   
   
       3 . The two-purpose-pedal of  claim 2  wherein said two straight holes have flat surface surrounding their exits, said flat surface is perpendicular to the direction of the hole that it is surrounded, providing nice flat wall for washers or hex nuts to press against with maximum contact when said hex nuts lock onto the threading of an instep-coupler that emerges from said exits of said two straight holes. 
   
   
       4 . The two-purpose-pedal of  claim 3  wherein said two straight holes are parallel to said pedal shaft. 
   
   
       5 . The two-purpose-pedal of  claim 3  wherein said two straight holes aren't parallel to each other, they become farther apart as they enter from said back side of said pedal body and continue toward said front side of said pedal body. 
   
   
       6 . The two-purpose-pedal of  claim 3  wherein said two straight holes aren't parallel to each other, they become closer to each other as they entered from said back side of said pedal body and continue toward said front side of said pedal body. 
   
   
       7 . The two-purpose-pedal of  claim 3  wherein said two straight holes either one or both have circular lateral cross-sectional shape. 
   
   
       8 . The two-purpose-pedal of  claim 3  wherein said two straight holes either one or both have elliptical lateral cross-sectional shape. 
   
   
       9 . The two-purpose-pedal of  claim 3  wherein said two straight holes either one or both have square lateral cross-sectional shape. 
   
   
       10 . The two-purpose-pedal of  claim 3  wherein said two straight holes either one or both have rectangular lateral cross-sectional shape. 
   
   
       11 . The two-purpose-pedal of  claim 3  wherein said two straight holes either one or both have triangular lateral cross-sectional shape. 
   
   
       12 . The two-purpose-pedal of  claim 1  wherein said two straight holes are perpendicular to the lengthwise of said pedal shaft, located close to the back side of said pedal-body, said back side of said pedal body is the side of said pedal body that is facing a crank-arm when said two-purpose-pedal is attached to a crank-arm using said pedal shaft. 
   
   
       13 . The two-purpose-pedal of  claim 12  wherein said two straight holes have flat surface surrounded their entrances and exits, said flat surface is perpendicular to the direction of the hole that it is surrounded allow washers and/or hex nuts to press against with maximum contact when said hex nuts lock on to the threading of an instep-coupler. 
   
   
       14 . The two-purpose-pedal of  claim 13  wherein said two straight holes are parallel to each other. 
   
   
       15 . The two-purpose-pedal of  claim 13  wherein said two straight holes aren't parallel to each other. 
   
   
       16 . The two-purpose-pedal of  claim 13  wherein said two straight holes either one or both have circular lateral cross-sectional shape. 
   
   
       17 . The two-purpose-pedal of  claim 13  wherein said two straight holes either one or both have elliptical lateral cross-sectional shape. 
   
   
       18 . The two-purpose-pedal of  claim 13  wherein said two straight holes either one or both have square lateral cross-sectional shape. 
   
   
       19 . The two-purpose-pedal of  claim 13  wherein said two straight holes either one or both have rectangular lateral cross-sectional shape. 
   
   
       20 . The two-purpose-pedal of  claim 13  wherein said two straight holes either one or both have triangular lateral cross-sectional shape.