Exercise machine
A stationary exercise machine may include reciprocating hand members, such as handles, and/or reciprocating foot members, such as foot pedals. The reciprocating hand members may be operative to apply a first moment to a crankshaft, and the reciprocating foot members may be operative to apply a second moment to the crankshaft. The second moment may be different than the first moment. The reciprocating foot members may cause a user's feet to move along a closed loop path that is substantially inclined, such that the user's foot motion simulates a climbing motion more than a flat walking or running motion. The reciprocating hand members may be configured to move in coordination with the foot members via a linkage operatively coupling the hand members with the foot members. A resistance mechanism may apply resistance to crankshaft rotation, and the resistance mechanism may be adjustable while the user is using the machine.
1. A stationary exercise machine comprising:
a frame;
a crankshaft coupled with the frame and rotatable about a crankshaft axis;
first and second crank arms rigidly coupled with respective opposite sides of the crankshaft, wherein rotation of at least one of the first or second crank arms causes rotation of the crankshaft about the crankshaft axis;
first and second intermediate crank arms rigidly coupled with the first and second crank arms, respectively; and
first and second handles operatively coupled with the first and second intermediate crank arms, respectively, at respective pivot axes to convert a user's input force at the first and second handles into a moment on the crankshaft, wherein the respective pivot axes are spaced a distance from the crankshaft axis and orbit the crankshaft axis to define respective virtual crank arms extending between the respective pivot axes and the crankshaft axis.
2. The stationary exercise machine of claim 1 , wherein the first and second intermediate crank arms are angularly offset from the first and second crank arms, respectively, to define an angle between the first and second intermediate crank arms and the first and second crank arms, respectively.
3. The stationary exercise machine of claim 1 , wherein the angle comprises about 15 degrees.
4. The stationary exercise machine of claim 1 , further comprising first and second upper reciprocating members pivotally coupled with the first and second intermediate crank arms, respectively, at the respective pivot axes and pivotally coupled with the first and second handles, respectively.
5. The stationary exercise machine of claim 4 , wherein:
the first and second intermediate crank arms are positioned laterally inside of the first and second upper reciprocating members; and
the first and second crank arms are positioned laterally inside of the first and second intermediate crank arms.
6. The stationary exercise machine of claim 4 , wherein the first reciprocating member is pivotally coupled with a first extension of the first handle and the second upper reciprocating member is pivotally coupled with a second extension of the second handle.
7. The stationary exercise machine of claim 4 , wherein the first and second upper reciprocating members comprise first and second rigid links, respectively.
8. The stationary exercise machine of claim 1 , wherein the moment comprises a first moment and the respective pivot axes comprise respective first pivot axes, and further comprising first and second pedals operatively coupled with the first and second crank arms, respectively, at respective second pivot axes to convert a user's input force at the first and second pedals into a second moment on the crankshaft.
9. The stationary exercise machine of claim 8 , wherein the second moment is larger than the first moment.
10. The stationary exercise machine of claim 8 , further comprising first and second lower reciprocating members pivotally coupled with the first and second crank arms, respectively, at the respective second pivot axes, and coupled with the first and second pedals, respectively, at a location distal from the respective second pivot axes.
11. The stationary exercise machine of claim 10 , wherein the first and second lower reciprocating members are positioned laterally between the first and second crank arms and the first and second intermediate crank arms, respectively.
12. The stationary exercise machine of claim 10 , further comprising:
first and second inclined members coupled with the frame; and
first and second pairs of rollers coupled with the first and second lower reciprocating members, respectively, wherein the first and second pairs of rollers travel along a length of the first and second inclined members, respectively.
13. The stationary exercise machine of claim 12 , wherein:
the first and second pairs of rollers each include first and second rollers coupled together with an axle; and
the first and second rollers of the first and second pairs of rollers travel along separate inclined members of the first and second inclined members, respectively.
14. The stationary exercise machine of claim 1 , wherein:
the first and second crank arms each include a first end rigidly coupled with the crankshaft and a second end spaced from the crankshaft axis; and
the first and second intermediate crank arms each include a first end rigidly coupled with the second end of a respective crank arm of the first and second crank arms, and a second end defining a respective pivot axis of the respective pivot axes.
15. The stationary exercise machine of claim 14 , further comprising first and second upper reciprocating members each including a first end pivotally coupled with the second end of a respective intermediate crank arm of the first and second intermediate crank arms, and a second end pivotally coupled to a respective handle of the first and second handles.
16. The stationary exercise machine of claim 14 , further comprising first and second lower reciprocating members each including a forward end pivotally coupled with the second end of a respective crank arm of the first and second crank arms and the first end of a respective intermediate crank arm of the first and second intermediate crank arms.
17. The stationary exercise machine of claim 16 , wherein the forward ends of the first and second lower reciprocating members are positioned laterally between the second ends of the first and second crank arms and the first ends of the first and second intermediate crank arms, respectively.
18. The stationary exercise machine of claim 16 , further comprising first and second pedals coupled with rearward ends of the first and second lower reciprocating members, respectively.
19. The stationary exercise machine of claim 1 , further comprising a resistance mechanism operatively coupled with the crankshaft to resist rotation of the crankshaft about the crankshaft axis.
20. A stationary exercise machine comprising:
a frame;
a crankshaft coupled with the frame and rotatable about a crankshaft axis;
first and second handles pivotally coupled with the frame at a handle pivot axis;
first and second upper reciprocating members pivotally coupled with the first and second handles, respectively, at first pivot axes offset from the handle pivot axis;
first and second intermediate crank members pivotally coupled with the first and second reciprocating members, respectively, at reciprocating axes that orbit the crankshaft axis and define virtual crank arms extending between the crankshaft axis and the reciprocating axes;
first and second crank arms fixedly coupled with the first and second intermediate crank members, respectively, at crank axes, the first and second crank arms positioned laterally inside of the first and second intermediate crank members, respectively, and fixedly coupled with the crankshaft;
first and second lower reciprocating members pivotally coupled with the first and second crank arms, respectively, and the first and second intermediate crank arms, respectively, at the crank axes; and
first and second foot pedals coupled with the first and second lower reciprocating members;
wherein:
the first and second handles are operatively coupled with the first and second intermediate crank arms, respectively, to convert a user's input force at the first and second handles into a first moment on the crankshaft; and
the first and second foot pedals are operatively coupled with the first and second crank arms, respectively, to convert a user's input force at the first and second foot pedals into a second moment on the crankshaft that is different than the first moment.