Self-propelled vehicle propelled by an elliptical drive train with adjustable stride length mechanism

1. An apparatus, comprising:

a frame;

a drive wheel coupled to the frame;

a first and a second foot link operably coupled to drive wheel to transfer power to said drive wheel so as to propel the apparatus, each including a foot receiving portion for receiving an operator's foot, a front end, and a rear end; and

a pivot axis coupled to the frame, a crank arm bearing at the pivot axis, a first and a second crank arm coupled to crank arm bearing, a coupling point where the rear end of the foot link couples to the crank arm, and a radial length between the crank arm bearing and the coupling point, said radial length being adjustable to change a stride length of an operator's foot positioned on the foot receiving portion of the foot link.

2. The apparatus of claim 1 , wherein the rear end of the foot link travels in a generally circular path having a diameter, and the radial length is adjustable for varying the diameter of the generally circular path traveled by the rear end of the foot link.

3. The apparatus of claim 1 , wherein the foot receiving portion travels in an elliptical path and the radial length is adjustable for varying the elliptical path of the foot receiving portion.

4. An apparatus, comprising:

a frame having a drive wheel rotatably supported thereupon, and a pivot axis defined thereupon;

a first and a second foot link, each having a first end coupled with said pivot axis and directed in an arcuate path of travel, a second end, and a foot receiving portion defined thereupon;

a crank assembly which is in mechanical communication with said pivot axis and with said first ends of said foot links to direct said first ends of said foot links in an arcuate path of travel, said crank assembly including a radial length that is adjustable to change a stride length of an operator's foot positioned on the foot receiving portion of the foot link;

a foot link guide track supported by said frame and being operable to direct the second end in the reciprocating path of travel;

the first end of one of said foot links coupled to the drive wheel whereby when the first end of one of said foot links travels in said arcuate path and the second end of that foot link travels in said reciprocating path, an operator's foot supported thereupon travels in a generally elliptical path of travel with said adjustable stride length, and the first end of one of said foot links transfers power from the first end of one of said foot links to said drive wheel.

5. The apparatus of claim 4 , wherein the arcuate path traveled by the first end of the foot link has a diameter that is adjustable for varying the diameter of the arcuate path traveled by the first end of the foot link.

6. The apparatus of claim 4 , further including a crank arm bearing at the pivot axis, a first and a second crank arm coupled to crank arm bearing, a coupling point where the first end of the foot link couples to the crank arm, and a radial length between the crank arm bearing and the coupling point, said radial length being adjustable.

7. The apparatus of claim 4 , wherein the elliptical path of the foot receiving portion is adjustable.

8. An apparatus, comprising:

a frame having a drive wheel rotatably supported thereupon, and a pivot axis defined thereupon;

a first and a second foot link, each having a first end coupled with said pivot axis and directed in an arcuate path of travel, a second end directed in a reciprocating path of travel, and a foot receiving portion defined thereupon;

a crank assembly which is in mechanical communication with said pivot axis and with said first ends of said foot links to direct said first ends of said foot links in an arcuate path of travel, said crank assembly including a radial length that is adjustable to change a stride length of an operator's foot positioned on the foot receiving portion of the foot link;

the first end of one of said foot links coupled to the drive wheel whereby when the first end of one of said foot links travels in said arcuate path and the second end of that foot link travels in said reciprocating path, an operator's foot supported thereupon travels in a generally elliptical path of travel with said adjustable stride length, and the first end of one of said foot links transfers power from the first end of one of said foot links to said drive wheel.

9. The apparatus of claim 8 , further including a foot link guide track supported by said frame and being operable to direct the second end in the reciprocating path of travel.