Adjustable crank arms for elliptical bike and method of use

1. An apparatus, comprising:

a frame with a pivot axis defined thereupon;

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;

an adjustable stride length mechanism coupling the rear end of the foot link to the pivot axis at a radial length, the adjustable stride length mechanism including a plurality of attachment points for adjusting the radial length; and

an attachment mechanism for selectively attaching the pivot axis to one of the plurality of attachment points of the adjustable stride length mechanism.

2. The apparatus of claim 1 , further including an attachment mechanism for selectively attaching the rear end of the foot link to one of the plurality of attachment points of the adjustable stride length mechanism.

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

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, a second end, and a foot receiving portion defined thereupon;

a coupler assembly which is in mechanical communication with said pivot axis and with a first end of each of said first and second foot links, said coupler assembly including an adjustable stride length mechanism including a plurality of attachment points and being operative to direct said first ends of said foot links in an arcuate path of travel;

a foot link guide supported by said frame, said guide being operable to engage a second end of each of said foot links, and to direct said second ends along a reciprocating path of travel;

a power transfer linkage in mechanical communication with said coupler assembly and with said 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 reciprocal path, an operator's foot supported thereupon travels in a generally elliptical path of travel with a stride length that is determined by the selected attachment point for the foot link onto the adjustable stride length mechanism, and said power transfer linkage transfers power from said coupler assembly to said drive wheel, so as to supply propulsive power thereto.

5. The apparatus of claim 4 , further including an attachment mechanism for selectively attaching the rear end of the foot link to one of the plurality of attachment points of the adjustable stride length mechanism.

6. The apparatus of claim 4 , further including an attachment mechanism for selectively attaching the pivot axis to one of the plurality of attachment points of the adjustable stride length mechanism.

7. The apparatus of claim 4 , wherein the adjustable stride length mechanism is operable for varying the elliptical path through which the operator's foot travels.

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, a second end, and a foot receiving portion defined thereupon;

a coupler assembly which is in mechanical communication with said pivot axis and with a first end of each of said first and second foot links, said coupler assembly including an adjustable stride length mechanism including a plurality of attachment points and being operative to direct said first ends of said foot links in an arcuate path of travel;

a foot link guide track supported by said frame, said foot link guide track being operable to engage a second end of each of said foot links, and to direct said second ends along a reciprocating path of travel;

a power transfer linkage in mechanical communication with said coupler assembly and with said 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 reciprocal path, an operator's foot supported thereupon travels in a generally elliptical path of travel with a stride length that is determined by the selected attachment point for the foot link onto the adjustable stride length mechanism, and said power transfer linkage transfers power from said coupler assembly to said drive wheel, so as to supply propulsive power thereto.

9. The apparatus of claim 8 , further including an attachment mechanism for selectively attaching the rear end of the foot link to one of the plurality of attachment points of the adjustable stride length mechanism.

10. The apparatus of claim 8 , further including an attachment mechanism for selectively attaching the pivot axis to one of the plurality of attachment points of the adjustable stride length mechanism.

11. The apparatus of claim 8 , wherein the adjustable stride length mechanism is operable for varying the elliptical path through which the operator's foot travels.

12. 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, a second end, and a foot receiving portion defined thereupon;

a coupler assembly which is in mechanical communication with said pivot axis and with a first end of each of said first and second foot links, said coupler assembly including an adjustable stride length mechanism including a plurality of attachment points and being operative to direct said first ends of said foot links in an arcuate path of travel;

a first and a second swing arm supported by said frame, said first and second swing arm operable to engage a second end of each respective foot link, and to direct said second ends along a reciprocating path of travel;

a power transfer linkage in mechanical communication with said coupler assembly and with said 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 reciprocal path, an operator's foot supported thereupon travels in a generally elliptical path of travel with a stride length that is determined by the selected attachment point for the foot link onto the adjustable stride length mechanism, and said power transfer linkage transfers power from said coupler assembly to said drive wheel, so as to supply propulsive power thereto.

13. The apparatus of claim 12 , further including an attachment mechanism for selectively attaching the rear end of the foot link to one of the plurality of attachment points of the adjustable stride length mechanism.

14. The apparatus of claim 12 , further including an attachment mechanism for selectively attaching the pivot axis to one of the plurality of attachment points of the adjustable stride length mechanism.

15. The apparatus of claim 12 , wherein the adjustable stride length mechanism is operable for varying the elliptical path through which the operator's foot travels.

16. An apparatus, comprising

a frame with a crank arm bearing including a centerline and a pivot axis defined thereupon;

a steering mechanism coupled to the frame;

a front wheel and a rear wheel coupled to the frame, the rear wheel including a rear wheel axle coupled to the pivot axis;

a first and a second foot link, each including a foot receiving portion for receiving an operator's foot, a front end, and a rear end;

an adjustable stride length mechanism coupled to the pivot axis and including a plurality of attachment points; and

an attachment mechanism for selectively attaching the rear end of the foot link to one of the plurality of attachment points of the adjustable stride length mechanism at a coupled point for selectively adjusting a distance from the centerline of the crank arm bearing to the coupled point to adjust an elliptical path through which the user's foot will travel when propelling the apparatus.