Linkage based exercise machine
View Patent ↗An exercise machine has a frame and an operating linkage. The operating linkage includes any of a number of mechanisms that can adjust a foot trace generated by the linkage. In one configuration, the foot trace can be adjusted between at least a generally vertical trace and a generally horizontal trace.
1. An exercise machine comprising a generally stationary frame assembly, an operating linkage supported by said frame assembly, said operating linkage connected to a foot support, said foot support adapted to receive a user's foot, said operating linkage comprising a first crank and a second crank, said first crank being rotatable about a first axis and said second crank being rotatable about a second axis, a bell crank assembly comprising a bell crank that is rotatable with said first crank and a lever arm connected to said bell crank such that rotation of said bell crank causes oscillation of said lever arm, said lever arm being connected to said foot support, a first connecting beam connected to said first crank and a second connecting beam connected to said second crank, said first and second connecting beams also connected to said foot support such that said first and second connecting beams generate a generally circular movement at said foot support and such that said lever arm generates a generally linear movement at said foot support.
2. The machine of claim 1 further comprising a drag link that connects said lever arm to said foot support.
3. The machine of claim 1 further comprising a connecting rod that connects that lever arm to said bell crank.
4. The machine of claim 1 , wherein said lever arm comprises a first end, a second end and a pivot position defined between said first end and said second end.
5. The machine of claim 4 , wherein said pivot position is adjustable along said lever arm between said first end and said second end.
6. The machine of claim 1 , wherein said lever arm comprises an adjustable length.
7. The machine of claim 1 , wherein said first crank comprises a first angular orientation and said second crank comprises a second angular orientation, at least one of said first and second angular orientations being adjustable relative to said other of said first and second angular orientations.
8. The machine of claim 1 , wherein said first crank comprise a first angular orientation and said second crank comprises a second angular orientation and said first and second angular orientations are generally said same.
9. The machine of claim 1 , wherein said lever arm is adjustable in length.
10. The machine of claim 1 further comprising means for adjusting a foot trace generated by movement of said foot support.
11. The machine of claim 10 , wherein said means comprises adjusting a relative angular orientation of said first crank and said second crank.
12. The machine of claim 10 , wherein said means comprises adjusting a lever arm ratio.
13. The machine of claim 10 , wherein said means comprises adjusting a length of said lever arm.
14. An exercise machine comprising a generally stationary frame assembly, an operating linkage supported by said frame assembly, said operating linkage comprising a first crank, said first crank having a first end connected to a first pivot axis and a second end connected to a first end of a first connecting beam, said operating linkage also comprising a second crank, said second crank having a first end connected to a second pivot axis and a second end connected to a first end of a second connecting beam, a foot beam connected to a second end of said first connecting beam and a second end of said second connecting beam, a first end of a bell crank rotatable with said first crank, a foot pad being supported by said foot beam, a second end of said bell crank being connected to a first end of a lever arm, a lever arm pivot being positioned between said first end of said lever arm and a second end of said lever arm, said second end of said lever arm connected to at least one component selected from said group consisting of said first connecting beam, said second connecting beam and said foot beam.
15. The machine of claim 14 , wherein said bell crank rotates about said first pivot axis.
16. The machine of claim 14 , wherein said lever arm pivot is movable along said lever arm.
17. The machine of claim 14 , wherein said lever arm has an adjustable length.
18. The machine of claim 14 , wherein a relative angular orientation between said first and second cranks is adapted to be adjusted by a user.
19. The machine of claim 14 further comprising means for adjusting a trace of movement generated at said foot pad.
20. machine of claim 19 , wherein said means for adjusting alters said trace between at least a generally vertical trace and a generally horizontal trace.