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Systems for facilitating conversion between reciprocating linear motion and rotational motion include a continuous undulating track circumscribing a circular profile and generally defining a cylindrical volume having a central axis; a reciprocator that is configured to linearly reciprocate along the

Systems for facilitating conversion between reciprocating linear motion and rotational motion include a continuous undulating track circumscribing a circular profile and generally defining a cylindrical volume having a central axis; a reciprocator that is configured to linearly reciprocate along the central axis; a converter coupled to the reciprocator to reciprocate with it, configured to rotate about the central axis, and engaged with the undulating track; and a rotator engaged with the converter and configured to rotate about the central axis with the converter but not to linearly reciprocate along the central axis.

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1. A system for facilitating conversion between reciprocating linear motion and rotational motion, comprising: a continuous undulating track defined by a first surface and a second surface opposing and spaced from the first surface, the track circumscribing a circular profile and generally defining

1. A system for facilitating conversion between reciprocating linear motion and rotational motion, comprising: a continuous undulating track defined by a first surface and a second surface opposing and spaced from the first surface, the track circumscribing a circular profile and generally defining a cylindrical volume having a central axis;a reciprocator configured to linearly reciprocate along the central axis;a converter positioned at least partially within the cylindrical volume, coupled to the reciprocator to linearly reciprocate with the reciprocator, and configured to rotate about the central axis, the converter including: a first roller engaged with the first surface of the undulating track; anda second roller engaged with the second surface of the undulating track; anda rotator positioned at least partially within the cylindrical volume, engaged with the converter, and configured to rotate about the central axis;wherein the reciprocator forces the converter to linearly reciprocate when the reciprocator is caused to linearly reciprocate along the central axis so that the first and second rollers roll along the undulating track thereby forcing the converter to rotate, in turn forcing the rotator to rotate; orwherein the rotator forces the converter to rotate when the rotator is caused to rotate about the central axis so that the first and second rollers roll along the undulating track so that the converter linearly reciprocates thereby forcing the reciprocator to linearly reciprocate. 2. The system of claim 1, wherein the first and second rollers are in rolling contact with each other. 3. The system of claim 1, wherein the converter further includes: a third roller engaged with the first surface of the undulating track; anda fourth roller engaged with the second surface of the undulating track. 4. The system of claim 3, wherein the first and second rollers are in rolling contact with each other and the third and fourth rollers are in rolling contact with each other. 5. The system of claim 1, wherein the rotator includes a linear track defined by a first surface and a second surface opposing and spaced from the first surface; andwherein the converter further includes:a third roller engaged with the first surface of the linear track; anda fourth roller engaged with the second surface of the linear track. 6. The system claim 5, wherein the third and fourth rollers are in rolling contact with each other. 7. The system of claim 5, wherein the rotator includes a second linear track defined by a first surface and a second surface opposing and spaced from the first surface; andwherein the converter further includes:a fifth roller engaged with the first surface of the second linear track; anda sixth roller engaged with the second surface of the second linear track. 8. The system of claim 7, wherein the third and fourth rollers are in rolling contact with each other and the fifth and sixth rollers are in rolling contact with each other. 9. The system of claim 7, wherein the converter further includes: a seventh roller engaged with the first surface of the undulating track; andan eighth roller engaged with the second surface of the undulating track. 10. The system of claim 9, wherein the first and second rollers are in rolling contact with each other, the third and fourth rollers are in rolling contact with each other, the fifth and sixth rollers are in rolling contact with each other, and the seventh and eighth rollers are in rolling contact with each other. 11. The system of claim 1, wherein the converter is coupled to the reciprocator so that the converter can rotate relative to the reciprocator. 12. A system for facilitating conversion between reciprocating linear motion and rotational motion, comprising: a continuous undulating track circumscribing a circular profile and generally defining a cylindrical volume having a central axis;a reciprocator configured to linearly reciprocate along the central axis;a converter positioned at least partially within the cylindrical volume, coupled to the reciprocator to linearly reciprocate with the reciprocator, engaged with the undulating track, and configured to rotate about the central axis; anda rotator positioned at least partially within the cylindrical volume, engaged with the converter, and configured to rotate about the central axis, wherein the rotator is generally cylindrical and includes a first passage through which the reciprocator extends and a second passage through which the converter extends;wherein when the reciprocator is caused to linearly reciprocate along the central axis, the reciprocator forces the converter to linearly reciprocate so that the converter rides along the undulating track thereby forcing the converter to rotate, in turn forcing the rotator to rotate; orwherein when the rotator is caused to rotate about the central axis, the rotator forces the converter to rotate so that the converter linearly reciprocates thereby forcing the reciprocator to linearly reciprocate. 13. The system of claim 12, wherein the undulating track is defined by a first surface and a second surface opposing and spaced from the first surface; andwherein the converter includes:a first roller engaged with the first surface of the undulating track; anda second roller engaged with the second surface of the undulating track. 14. The system of claim 13, wherein the first and second rollers are in rolling contact with each other. 15. The system of claim 13, wherein the converter further includes: a third roller engaged with the first surface of the undulating track; anda fourth roller engaged with the second surface of the undulating track. 16. The system of claim 15, wherein the first and second rollers are in rolling contact with each other and the third and fourth rollers are in rolling contact with each other. 17. The system of claim 15, wherein the second passage defines a linear track defined by a first surface and a second surface opposing and spaced from the first surface; andwherein the converter further includes:a fifth roller engaged with the first surface of the linear track; anda sixth roller engaged with the second surface of the linear track. 18. The system of claim 17, wherein the rotator further includes a second linear track defined by a first surface and a second surface opposing and spaced from the first surface; andwherein the converter further includes:a seventh roller engaged with the first surface of the second linear track; andan eighth roller engaged with the second surface of the second linear track. 19. The system of claim 18, wherein the first and second rollers are in rolling contact with each other, the third and fourth rollers are in rolling contact with each other, the fifth and sixth rollers are in rolling contact with each other, and the seventh and eighth rollers are in rolling contact with each other. 20. The system of claim 12, wherein the second passage defines a linear track defined by a first surface and a second surface opposing and spaced from the first surface; andwherein the converter includes:a first roller engaged with the first surface of the linear track; anda second roller engaged with the second surface of the linear track. 21. The system of claim 20, wherein the first and second rollers are in rolling contact with each other. 22. The system of claim 20, wherein the rotator further includes a second linear track defined by a first surface and a second surface spaced from the first surface; andwherein the converter further includes:a third roller engaged with the first surface of the second linear track; anda fourth roller engaged with the second surface of the second linear track. 23. The system of claim 22, wherein the first and second rollers are in rolling contact with each other and the third and fourth rollers are in rolling contact with each other. 24. The system of claim 12, wherein the converter is coupled to the reciprocator so that the converter can rotate relative to the reciprocator. 25. A system for facilitating conversion between reciprocating linear motion and rotational motion, comprising: a continuous undulating track circumscribing a circular profile and generally defining a cylindrical volume having a central axis;a reciprocator configured to linearly reciprocate along the central axis;a converter positioned at least partially within the cylindrical volume, coupled to the reciprocator to linearly reciprocate with the reciprocator, and engaged with the undulating track, the converter including a first roller and a second roller; anda rotator positioned at least partially within the cylindrical volume and configured to rotate about the central axis, the rotator including a linear track defined by a first surface and a second surface opposing and spaced from the first surface, wherein the first surface is engaged with the first roller and the second surface is engaged with the second roller;wherein when the reciprocator is caused to linearly reciprocate along the central axis, the reciprocator forces the converter to linearly reciprocate thereby forcing converter to ride along the undulating track thereby forcing the converter to rotate and the first and second rollers to roll along the linear track, in turn forcing the rotator to rotate; orwherein when the rotator is caused to rotate about the central axis, the rotator forces the first and second rollers to roll along the linear track thereby forcing the converter to rotate and ride along the undulating track thereby forcing the converter linearly reciprocates, in turn forcing the reciprocator to linearly reciprocate. 26. A system for facilitating conversion between reciprocating linear motion and rotational motion, comprising: a continuous undulating track defined by a first surface and a second surface opposing and spaced from the first surface, the track circumscribing a circular profile and generally defining a cylindrical volume having a central axis;a reciprocator configured to linearly reciprocate along the central axis;a converter positioned at least partially within the cylindrical volume, coupled to the reciprocator to linearly reciprocate with the reciprocator, and configured to rotate about the central axis, the converter including:a first roller engaged with the first surface of the undulating track;a second roller engaged with the second surface of the undulating track;a third roller; anda fourth roller; anda rotator positioned at least partially within the cylindrical volume, engaged with the converter, and configured to rotate about the central axis, wherein the rotator is generally cylindrical and includes:a passage through which the reciprocator extends; anda linear track defined by a first surface and a second surface opposing and spaced from the first surface, wherein the first surface of the linear track is engaged with the third roller and the second surface of the linear track is engaged with fourth roller;wherein when the reciprocator is caused to linearly reciprocate along the central axis, the reciprocator forces the converter to linearly reciprocate so that the third and fourth roller roll along and linear track and the first and second rollers roll along the undulating track thereby forcing the converter to rotate, in turn forcing the rotator to rotate; orwherein when the rotator is caused to rotate about the central axis, the rotator forces the third and fourth rollers to roll along the linear track and the first and second rollers to roll along the undulating track so that the converter linearly reciprocates thereby forcing the reciprocator to linearly reciprocate. 27. A system for facilitating conversion between reciprocating linear motion and rotational motion, comprising: a reciprocator that is configured to linearly reciprocate along a first axis;a converter coupled to the reciprocator and configured to linearly reciprocate along the first axis and to rotate about the first axis;a first rotating element coupled to the converter and configured to rotate about the first axis; anda second rotating element coupled to the first rotating element and configured to rotate about a second axis that is transverse to the first axis. 28. The system of claim 27, wherein the second axis is perpendicular to the first axis. 29. The system of claim 27, further comprising: a continuous undulating track circumscribing a circular profile and generally defining a cylindrical volume having a central axis that is coaxial to the first axis;wherein the converter is engaged with the track to linearly reciprocate with the reciprocator by riding along the track, forcing the converter to rotate, and wherein rotation of the converter causes the converter to ride along the track to linearly reciprocate. 30. The system of claim 29, wherein the second axis is perpendicular to the first axis.