Patent ID: 7207925

Claim:
An elliptical exercise machine comprising: a frame; at least two crankshafts rotationally connected to said frame; a left rail attached to both of said crankshafts so that said left rail traverses a path in conjunction with the rotation of said crankshafts; a right rail attached to both of said crankshafts so that said right rail traverses a path in conjunction with the rotation of said crankshafts; a left footskate capable of reciprocating motion on said left rail; a right footskate capable of reciprocating motion on said right rail; a cam track, said track describing a path; a left rocker arm, said left rocker arm being arranged to oscillate about a first axis through a first angular distance as said crankshafts rotate, said left rocker arm having a distal end wherein said distal end traverses said path as said left rocker arm oscillates; and a right rocker arm, said right rocker arm being arranged to oscillate about said first axis through a second angular distance as said crankshafts rotate, said right rocker arm having a distal end wherein said distal end traverses said path as said right rocker arm oscillates; a left adjustment arm, said left adjustment arm connected to said left rocker arm such that said left adjustment arm moves through a third angular distance as said left rocker arm oscillates, said third angular distance being related to said first angular distance; a right adjustment arm, said right adjustment arm connected to said right rocker arm such that said right adjustment arm moves through a fourth angular distance as said left rocker arm oscillates, said fourth angular distance being related to said second angular distance; wherein, said left adjustment arm is operationally attached to said left footskate via an interface located toward the distal end of said left adjustment arm in a manner so that reciprocation of said left adjustment arm through said third angular distance provides said reciprocating motion to said left footskate; wherein, said right adjustment arm is operationally attached to said right footskate via an interface located toward the distal end of said right adjustment arm in a manner so that reciprocation of said right adjustment arm through said fourth angular distance provides said reciprocating motion to said right footskate; wherein said cam track is moveable; and wherein movement of said cam track between two different positions alters said first angular distance.