in the following description , for purposes of explanation and not limitation , specific details are set forth in order to provide a thorough understanding of the present invention . however , it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details . in other instances , detailed descriptions of well - known methods and devices are omitted so as to not obscure the description of the present invention with unnecessary detail . referring now to the invention in more detail , in fig1 to fig1 , there is shown a device , called stepping cycle , which is used as a vehicle for a rider for the purpose of transportation or entertainment . fig1 shows the invention attached to each foot of a skater in a riding mode . on a hard surface 10 , such as road , street , play ground , or stage , a rider wears one device on the left leg 12 and one device on the right leg 14 . the left foot 16 and right foot 18 are restrained to each device . in fig1 , the right leg is in a propelling position and the left leg is in a gliding position . after the right foot propelling , the rider glides on the left device and , during the meantime , lifts the right device and carries it forward and steps on ground for next gliding motion . then , the left foot does the propelling and so on . fig2 is a side view of the embodiment of the present invention , viewed from the stepping side on which the stepping assembly mounts . the embodiment has a riding wheel , which contains tire 20 , rim 22 , rods 24 , and axle 26 . the riding wheel &# 39 ; s axle 26 is mounted between the two ends of a u - shaped frame 30 . on the wheel axle 26 a stepping assembly is mounted , which contains two supporting legs 32 and 36 , and a foot pedal 40 . the supporting leg 32 has a stepping shoe 34 and the supporting leg 36 has a stepping shoe 38 . the u - shaped frame 30 is attached to rider &# 39 ; s leg with a leg coupling 42 . on the foot pedal 40 , there are foot restraints 44 and 46 , which hold skater &# 39 ; s foot 18 on the foot pedal 40 . fig3 is a side view of the embodiment of the present invention , viewed from the non - stepping side and attached to the left foot 16 . fig4 is a rear view of the embodiment attached to the right foot 18 and the left foot 16 in a riding mode . the wheels tilt outward to balance the rider &# 39 ; s center of mass . the leg coupling 42 keeps a distance between the u - shaped frame 30 and the leg to force the riding wheel tilt outward . fig5 shows the rear views of the embodiment for the left foot in a braking position and the embodiment for the right foot in a propelling position . the stepping assembly tilts forward when the rider shifts the center of mass to the heel , which causes the back stepping shoe 38 to press against ground surface and brake the forward motion . the stepping assembly tilts backward when the rider shifts the center of mass to the toe , which causes the front stepping shoe 34 to press against ground surface and propel the rider move forward . the rider can stand in either the propelling position or the braking position . the front stepping shoe 34 is mounted on the front supporting leg 32 with a bolt 54 and the back stepping shoe 38 is mounted on the back supporting leg 36 with a bolt 52 . the foot pedal 40 is mounted on the front supporting leg 32 with a bolt 58 and on the back supporting leg 36 with a bolt 56 . fig6 is a side view of the embodiment in a walking mode where the two supporting legs 32 and 36 reduce their angle to lift the riding wheel from ground . fig7 shows a foot pedal design that allows convenient converting of the stepping assembly from a riding mode to a walking mode . on the foot pedal 40 , there are adjustable mounting slots 72 and 74 for the mounting bolts 56 and 58 . the angle between the supporting legs 32 and 36 can be changed by tapping the front leg 32 forward and / or tapping the back leg 36 backward to allow them take specific positions . a tension spring 48 can be used to produce an angular tension between the supporting legs . fig8 is a side view of an alternative embodiment with one center supporting leg 60 . the foot pedal 40 is mounted on the center leg 60 . the foot pedal 40 can be mounted on the center leg 60 at different heights to allow different stepping angular ranges . the front toe 62 and the back toe 66 are mounted on the foot pedal 40 with an adjustable angle for conversion between riding ( fig8 ) and walking ( fig9 ) modes . in the riding mode shown in fig8 , the stepping toes take a flat position . rider can propel by pressing down the front of the foot pedal and can brake by pressing down the rear of the foot pedal . fig9 shows a side view of an alternative embodiment with one center leg 60 in the walking mode where the stepping toes 62 and 66 take a vertical position to lift the wheel from ground . fig1 is a side view of an alternative embodiment with a stepping wheel 70 mounted beneath the foot pedal 40 in the stepping assembly with two supporting legs . fig1 is a side view of an alternative embodiment with one center leg 60 and a stepping wheel 70 beneath the foot pedal 40 . fig1 shows the invention with a stepping wheel 70 in a walking mode or straight riding mode . when walking or riding in a straight - up position , the stepping wheel supports the skater and both the stepping wheel and the riding wheel roll on the ground surface 10 . fig1 shows the invention with a stepping wheel 70 in a tilted riding position . when riding fast , a rider can tilt to outer side and the stepping wheel is lifted from the ground surface 10 to allow the center of mass falls on the riding wheel . fig1 shows an alternative embodiment that uses rim brake fingers 82 and 84 to brake the riding wheel . the rim brake fingers are mounted to the side of the foot pedal toward the riding wheel . when the foot pedal is pressed forward or backward , the rim brake finger will press against the rim of the riding wheel to brake its movement . fig1 show an alternative embodiment that the movement of the riding wheel is powered by swing motion of the foot pedal 40 through a chain 92 connected to the foot pedal 40 and going through a sprocket 94 at the axle of the riding wheel . in further detail , still referring to the invention of fig1 to fig1 , the size of the riding wheel can vary for comfort and vary purposes , such as a diameter between 5 and 30 inches . the stepping arms should be long enough to make the stepping shoes reach out of the wheel . the construction details of the invention as shown in fig1 to fig1 are that the u - shaped frame 30 may be made of aluminum alloy or any other sufficient rigid and strong material such as high - strength plastic , metal , and the like . the stepping assembly can be made of strong materials such as aluminum alloy or high - strength plastic , metal , and the like . the advantages of the present invention include , without limitation , that it can be used in any road conditions for both walking and riding , including climbing . it allows a rider to stand comfortably and provides a natural walking way to propel forward and a natural way to brake . its large riding wheel allows fast gliding when road condition is good . the u - shaped frame provides stable support for the riding wheel and allows firm control of the tilt angle of the riding wheel . the stepping assembly provides support for propelling force and braking force . it provides convenient way to adjust heights and angle ranges . it allows a rider &# 39 ; s center of mass to align easily with the riding wheel to achieve a balanced riding and walking . in broad embodiment , the present invention is a stepping cycle with a riding wheel for each foot . while the foregoing written description of the invention enables one of ordinary skill to make and use what is considered presently to be the best mode thereof , those of ordinary skill will understand and appreciate the existence of variations , combinations , and equivalents of the specific embodiment , method , and examples herein . the invention should therefore not be limited by the above described embodiment , method , and examples , but by all embodiments and methods within the scope and spirit of the invention .
the present invention relates to a transportation device comprising one riding wheel , a u - shaped frame , and a stepping assembly . the riding wheel is mounted between the two ends of the u - shaped frame and the stepping assembly is mounted on the axle of the riding wheel . the stepping assembly contains a foot pedal and one or two supporting legs with an optional stepping wheel beneath the foot pedal . this device can conveniently convert between a riding mode and a walking mode to allow rider skate , walk , and stand in various ground surfaces .