Elliptical exercise machine with adjustable stride length

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The invention claimed is:

1. An elliptical exercise machine comprising: a frame; at least two crankshafts rotationally connected to said frame; a rail attached to said crankshafts so that saidrail traverses a path in conjunction with the rotation of said crankshafts; a footskate capable of reciprocating motion on said rail; an interface arm, said interface arm having a distal and proximal end and a length therebetween, said proximal end ofsaid interface arm being connected to said rail; an inverted pendulum arm having a proximal and distal end and a length therebetween, said inverted pendulum arm rotating about an axis of rotation located toward said proximal end of said invertedpendulum arm; a coupler connecting said distal end of said interface arm to said inverted pendulum arm at a point along said length of said inverted pendulum arm, said distance between said coupler and said first axis defining a first radius; and atransfer arm having a proximal and distal end and a length therebetween, the transfer arm being attached at said proximal end to said inverted pendulum arm, said transfer arm also being connected at said distal end to said footskate, said distancebetween said proximal end of said transfer arm and said first axis defining a second radius; wherein said interface arm causes said inverted pendulum arm to reciprocate about said first axis, which in turn causes said transfer arm to make said footskatereciprocate on said rail; and wherein said first radius and said second radius are adjustable relative to each other.

2. The machine of claim 1 wherein said second radius is adjustable.

3. The machine of claim 2 wherein said first radius is fixed.

4. The machine of claim 1 wherein said first radius is adjustable.

5. The machine of claim 4 wherein said second radius is fixed.

6. The machine of claim 1 further comprising an adjustment mechanism for adjusting at least one of said first radius and said second radius.

7. The machine of claim 6 wherein said adjustment mechanism includes a hydraulic cylinder.

8. The machine of claim 6 wherein said adjustment mechanism is electrically powered.

9. The machine of claim 6 wherein said adjustment mechanism include a worm screw.

10. The machine of claim 6 wherein said adjustment mechanism is hand powered.

11. The machine of claim 1 wherein at least one of said crankshafts is attached to a flywheel.

12. The machine of claim 11 wherein at least one of said crankshafts is attached to a resistance device.

13. The machine of claim 1 wherein the position of said rail at any selected point of rotation, is parallel to the position of said rail at any other selected point of rotation.

14. The machine of claim 1 further comprising an arm exercise mechanism which oscillates relative to said frame.

15. The machine of claim 14 wherein the angle through which said arm exercise mechanism oscillates is independent of the reciprocation of said footskate.

16. A method of altering the stride length of an elliptical exercise machine during an exercise, the method comprising: providing an elliptical exercise machine; the machine including: a frame; at least two crankshafts rotationally connectedto said frame; a rail attached to said crankshafts so that said rail traverses a path in conjunction with the rotation of said crankshafts; a footskate capable of reciprocation motion on said rail; an interface arm said interface arm having distal andproximal ends and a length therebetween, said proximal end of said interface arm being connected to said rail; an inverted pendulum arm having a proximal and distal end and a length therebetween, said inverted pendulum arm rotating about an axis ofrotation located toward said proximal end of said inverted pendulum arm; a coupler connecting a distal end of said interface arm to said inverted pendulum arm along said length of said inverted pendulum arm, said distance between said coupler and saidfirst axis defining a first radius; and a transfer arm having a proximal and distal end and a length therebetween, the transfer arm being attached at said proximal end to said inverted pendulum arm, said transfer arm also being connected at said distalend to said footskate, said distance between said proximal end of said transfer arm and said first axis defining a second radius; operating said machine so that said interface arm causes said inverted pendulum arm to reciprocate about said first axis,which in turn causes said transfer arm to reciprocate said footskate on said rail; and adjusting said first radius or said second radius relative to the other while said machine is operating.

17. The method of claim 16 wherein during said step of adjusting, said second radius is adjusted.

18. The method of claim 17 wherein during said step of adjusting, said first radius remains constant.

19. The method of claim 16 wherein during said step of adjusting, said first radius is adjusted.

20. The method of claim 19 wherein during said step of adjusting, said second radius remains constant.