| 摘要 |
<p>A two-purpose-pedal consists of a pedal 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, 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 holes.</p> |
