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An apparatus includes a wheel having an axle, and a round disk connected to the axle. The round disk has a disk middle connected to the axle and a disk circumferential surface surrounding the disk middle. Further, a round ring having an inner ring surface is connected to the disk circumferential sur

An apparatus includes a wheel having an axle, and a round disk connected to the axle. The round disk has a disk middle connected to the axle and a disk circumferential surface surrounding the disk middle. Further, a round ring having an inner ring surface is connected to the disk circumferential surface of the round disk. The round disk is positioned within the round ring. The round ring contacts the round disk along a first plane, and the axle is coplanar with the first plane. Additionally, the round ring has a ring circumferential outer surface having threads. A threaded cylinder having an inner threaded cylinder surface is connected to the threads in the ring circumferential outer surface. The round ring is positioned within the threaded cylinder. Further, a worm gear is positioned between the threaded cylinder and the round ring.

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1. An apparatus comprising: a wheel having an axle;a round disk connected to said axle, said round disk having a disk middle connected to said axle and a disk circumferential surface surrounding said wheel and said disk middle;a round ring having an inner ring surface connected to said disk circumfe

1. An apparatus comprising: a wheel having an axle;a round disk connected to said axle, said round disk having a disk middle connected to said axle and a disk circumferential surface surrounding said wheel and said disk middle;a round ring having an inner ring surface connected to said disk circumferential surface of said round disk, said round disk being positioned within said round ring, said round ring contacting said round disk along a first plane, said axle being coplanar with said first plane, and said round ring comprising a ring circumferential outer surface having threads;a threaded cylinder having an inner threaded cylinder surface connected to said threads in said ring circumferential outer surface, said round ring being positioned within said threaded cylinder; anda worm gear connected to said threaded cylinder and contacting said round ring, rotation of said worm gear rotating said threaded cylinder relative to said round ring and thereby moving said wheel one of toward and away from said threaded cylinder. 2. The apparatus according to claim 1, said disk middle comprising a ramp surface extending in a direction perpendicular to said first plane and away from said round ring and said threaded cylinder. 3. The apparatus according to claim 1, said wheel comprising at least two wheels, and said at least two wheels sharing a common axle. 4. The apparatus according to claim 1, said round disk rotating freely in said round ring. 5. The apparatus according to claim 1, said round ring comprising a reduced friction surface where said round disk contacts said round ring, said reduced friction surface having a lower coefficient of friction relative to a remainder of a surface of said round ring. 6. An apparatus comprising: a wheel having an axle;a round disk connected to said axle, said round disk having a disk middle connected to said axle and a disk circumferential surface surrounding said disk middle;a round ring having an inner ring surface connected to said disk circumferential surface of said round disk, said round disk being positioned within said round ring, said round ring contacting said round disk along a first plane, said axle being coplanar with said first plane, and said round ring comprising a ring circumferential outer surface having threads;a threaded cylinder having an inner threaded cylinder surface connected to said threads in said ring circumferential outer surface, said round ring being positioned within said threaded cylinder; anda worm gear connected to said threaded cylinder and contacting said round ring, rotation of said worm gear rotating said threaded cylinder relative to said round ring and thereby moving said wheel one of toward and away from said threaded cylinder,said threads of said ring circumferential outer surface having slots, andsaid worm gear comprising worm gear threads that engage said slots of said ring circumferential outer surface. 7. The apparatus according to claim 6, said disk middle comprising a ramp surface extending in a direction perpendicular to said first plane and away from said round ring and said threaded cylinder. 8. The apparatus according to claim 6, said wheel comprising at least two wheels, and said at least two wheels sharing a common axle. 9. The apparatus according to claim 6, said round disk rotating freely in said round ring. 10. The apparatus according to claim 6, said round ring comprising a reduced friction surface where said round disk contacts said round ring, said reduced friction surface having a lower coefficient of friction relative to a remainder of a surface of said round ring. 11. An apparatus comprising: a wheel having an axle;a round disk connected to said axle, said round disk having a disk middle connected to said axle and a disk circumferential surface surrounding said disk middle;a round ring having an inner ring surface connected to said disk circumferential surface of said round disk, said round disk being positioned within said round ring, said round ring contacting said round disk along a first plane, said axle being coplanar with said first plane, and said round ring comprising a ring circumferential outer surface having threads;a threaded cylinder having an inner threaded cylinder surface connected to said threads in said ring circumferential outer surface, said round ring being positioned within said threaded cylinder; anda worm gear connected to said threaded cylinder and contacting said round ring, rotation of said worm gear rotating said threaded cylinder relative to said round ring and thereby moving said wheel one of toward and away from said threaded cylinder,said threads of said ring circumferential outer surface having slots,said worm gear comprising worm gear threads that engage said slots of said ring circumferential outer surface,said disk middle having a rotational center point about which said round disk rotates, andsaid axle being connected to a location offset from said rotational center point of said round disk. 12. The apparatus according to claim 11, said disk middle comprising a ramp surface extending in a direction perpendicular to said first plane and away from said round ring and said threaded cylinder. 13. The apparatus according to claim 11, said wheel comprising at least two wheels, and said at least two wheels sharing a common axle. 14. The apparatus according to claim 11, said round disk rotating freely in said round ring. 15. The apparatus according to claim 11, said round ring comprising a reduced friction surface where said round disk contacts said round ring, said reduced friction surface having a lower coefficient of friction relative to a remainder of a surface of said round ring.