Rowing machine
A rowing machine is disclosed. The rowing machine includes a frame including a base for contact with a support surface and a seat rail supported by the base. The rowing machine includes a seat configured to reciprocate back and forth along the seat rail. The rowing machine includes a rowing engine that includes at least one resistance mechanism rotatably coupled to the frame. The rowing machine includes at least one handle operatively connected to the at least one resistance mechanism, and a paddle linkage assembly operatively connecting the at least one handle to the at least one resistance mechanism such that rearward movement of the handle is resisted by the at least one resistance mechanism.
1. A rowing machine comprising:
a frame including a base for contact with a support surface and a seat rail supported by the base;
a seat configured to reciprocate back and forth along the seat rail;
a rowing engine comprising at least one resistance mechanism rotatably coupled to the frame;
at least one handle operatively connected to the at least one resistance mechanism; and
a paddle linkage assembly operatively connecting the at least one handle to the at least one resistance mechanism such that rearward movement of the at least one handle is resisted by the at least one resistance mechanism, the paddle linkage assembly comprising:
a paddle link pivotally coupled to the frame at a first pivot having a first pivot axis;
a crank link pivotally coupled to the frame at a second pivot having a second pivot axis parallel to and spaced apart from the first pivot axis whereby a virtual link is defined between the first and second pivot axes; and
a floating link having one end pivotally coupled at an end to the paddle link opposite the first pivot, wherein an opposite end of the floating link is pivotally coupled at an end to the crank link opposite the second pivot such that the paddle link, the crank link, the floating link, and the virtual link form a four-bar linkage.
2. The rowing machine of claim 1 , wherein the least one resistance mechanism comprises a flywheel rotatable about an output shaft.
3. The rowing machine of claim 2 , wherein the paddle linkage assembly is configured to convert the rearward movement of the at least one handle to a rotational movement of an input shaft of the rowing engine.
4. The rowing machine of claim 3 , further comprising a gearing assembly coupled between the input shaft and the output shaft and configured to increase the rotational speed from the input shaft to the output shaft.
5. The rowing machine of claim 4 , wherein the gearing assembly includes a first stage comprising a first input disc having a first input radius and operatively connected via a first transmission member to a first output disc having a first output radius smaller than the first input radius.
6. The rowing machine of claim 5 , wherein the gearing assembly includes a second stage comprising a second input disc having a second input radius and operatively connected via a second transmission member to a second output disc having a second output radius smaller than the second input radius.
7. The rowing machine of claim 3 , wherein the paddle linkage assembly includes a first paddle linkage comprising the paddle link, the floating link, and the crank link, and a second paddle linkage comprising another paddle link, floating link, and crank link disposed on an opposite side of the seat rail and operatively connected to the at least one resistance mechanism.
8. The rowing machine of claim 7 , wherein each of the first and second paddle linkages is configured to move independent of the other.
9. The rowing machine of claim 8 , wherein each of the first and second paddle linkages is associated with a respective handle, each of the respective handles being independently movable along a different trajectory than the other of the respective handles.
10. The rowing machine of claim 7 , wherein the first and second paddle linkages are both connected to the input shaft.
11. The rowing machine of claim 3 , wherein the crank link is connected to the input shaft.
12. The rowing machine of claim 1 , further comprising a handle link coupled to the paddle link.
13. The rowing machine of claim 12 , wherein the handle link is pivotally coupled to the paddle link.
14. The rowing machine of claim 13 , wherein the handle link is coupled to the paddle link via a paddle mount configured to pivot about a third axis perpendicular to the first axis.
15. The rowing machine of claim 12 , wherein a free end of the handle link is curved toward a centerline of the rowing machine.
16. The rowing machine of claim 1 , wherein the seat rail is pivotally coupled to the frame for adjusting an incline angle of the seat rail.
17. The rowing machine of claim 1 , wherein the at least one handle is coupled to the paddle linkage assembly via a universal joint coupling.
18. The rowing machine of claim 1 , wherein the paddle link comprises:
a tubular portion rotatably coupled to the second upright support such that a centerline of the tubular portion coincides with the first pivot axis;
a first end portion extend radially from the tubular portion in a first direction; and
a second end portion extending radially from the tubular portion in a second different direction.