Exercise devices having damped joints and related methods
An exercise device may comprise at least one joint. The at least one joint may comprise at least one first surface positioned adjacent to at least one second surface, the at least one second surface movable relative to the at least one first surface at at least one interface. A damping grease having a dynamic viscosity greater than about 100 Pascal seconds at standard temperature and pressure may be positioned at the at least one interface between the at least one first surface and the at least one second surface of the at least one joint.
1. An exercise device comprising:
a frame;
a first foot support member connected to a central rotating member and including
a central region mechanically constrained by a first joint to follow a first path;
a second foot support member connected to a central rotating member and including a central region mechanically constrained by a second joint to follow a second path;
wherein at least one of the first joint and the second joint includes an outer surface of a pin positioned adjacent to an inner surface of a bushing, the bushing being configured to move relative to the pin at an interface; and
a damping grease between the pin and the bushing having a dynamic viscosity greater than about 100 Pascal seconds at standard temperature and pressure positioned at the interface between the pin and the bushing of the at least one joint.
2. The exercise device of claim 1 , wherein the damping grease comprises a synthetic hydrocarbon fluid base.
3. The exercise device of claim 1 , wherein the damping grease further comprises silica.
4. The exercise device of claim 1 , wherein the damping grease has a dynamic viscosity of about 220 Pascal seconds at standard temperature and pressure.
5. The exercise device of claim 1 , wherein the at least one joint is configured to bear at least a portion of a user's weight while exercising on the exercise device.
6. The exercise device of claim 1 , further comprising:
a first swing arm coupled to a first side of an upper portion of the frame by a third joint, a first end of the first swing arm including a handle and a second end of the first swing arm coupled to the first foot support member via the first joint;
a second swing arm coupled to a second side of the upper portion of the frame by a fourth joint, a first end of the second swing arm including a handle and a second end of the second swing arm coupled to the second foot support member via the second joint.
7. The exercise device of claim 6 , further comprising:
a drive assembly including a rotating member, a first crank arm extending from a first side of the rotating member, and a second crank arm extending from a second side of the rotating member;
wherein the first crank arm is coupled to the first foot support member by a fifth joint, and the second crank arm is coupled to the second foot support member by a sixth joint;
wherein the at least one joint further includes at least one of the fifth joint and the sixth joint.
8. The exercise device of claim 1 , wherein the interface between the pin and the bushing of the at least one joint is shaped as a side surface of a cylinder.
9. The exercise device of claim 1 , wherein the dampening grease is configured to resist a first sudden movement of the at least one joint and configured to reduce resistance to movement after the first sudden movement.
10. The exercise device of claim 1 , further comprising a grease fitting disposed adjacent to the interface, wherein the grease fitting is configured to facilitate entry of the damping grease at the interface.
11. A method of manufacturing an exercise device, the method comprising:
providing a frame;
connecting a drive assembly to the frame;
providing a first foot support member connected to the drive assembly, wherein the first foot support member includes a central region mechanically constrained to follow a path;
providing a second foot support member connected to the drive assembly, wherein the second foot support member includes a central region mechanically constrained to follow a path;
positioning an outer surface of a pin of at least one of the first foot support member and the second foot support member adjacent to an inner surface of a bushing at an interface to form at least one joint;
positioning a damping grease having a dynamic viscosity greater than about 100 Pascal seconds at standard temperature and pressure at the interface between the pin and the bushing of the at least one joint.
12. The method of claim 11 , wherein positioning the damping grease includes positioning a damping grease comprising a synthetic hydrocarbon fluid base.
13. The method of claim 12 , wherein positioning the damping grease includes positioning a damping grease comprising silica.
14. The method of claim 11 , wherein positioning the damping grease comprises positioning a damping grease having a dynamic viscosity of about 220 Pascal seconds at standard temperature and pressure.
15. The method of claim 11 , wherein positioning the pin adjacent to the bushing to form the at least one joint comprises positioning the pin adjacent to the bushing to form at least one joint configured to bear at least a portion of a user's weight while exercising on the exercise device.
16. The method of claim 11 , further comprising:
coupling a first swing arm having a first end including a handle to a first side of an upper portion of the frame by a first joint;
coupling a second end of the first swing arm to the first foot support member by a second joint;
coupling a second swing arm having a first end including a handle to a second side of an upper portion of the frame by a third joint;
coupling a second end of the second swing arm to the second foot support member by a fourth joint.
17. The method of claim 16 , wherein positioning a damping grease having a dynamic viscosity greater than about 100 Pascal seconds at standard temperature and pressure at the interface between the pin and the bushing of the at least one joint comprises positioning the damping grease at an interface of the first joint and the third joint.
18. The method of claim 17 , wherein positioning the damping grease at an interface of the first joint and the third joint further comprises positioning the damping grease at an interface of the second joint and the fourth joint.
19. The method of claim 16 , further comprising:
providing the drive assembly including a rotating member, a first crank arm extending from a first side of the rotating member, and a second crank arm extending from a second side of the rotating member;
coupling the first foot support member to the first crank arm by a fifth joint;
coupling the second foot support member to the second crank arm by a sixth joint;
wherein positioning a damping grease having a dynamic viscosity greater than about 100 Pascal seconds at standard temperature and pressure at the at least one interface between the at least one pin and the at least one bushing of the at least one joint includes positioning the damping grease at an interface of the fifth joint and the sixth joint.
20. An exercise apparatus comprising:
a frame;
a drive assembly connected to the frame, wherein the drive assembly includes a first crank arm and a second crank arm;
a first foot support member coupled to the first crank arm of the drive assembly by a first joint;
a second foot support member coupled to the second crank arm of the drive assembly by a second joint;
the first joint and the second joint including an outer surface of a pin adjacent to an inner surface of a bushing; and
a damping grease disposed in at least one of the first and second joint between the pin and the bushing, wherein the damping grease is configured to resist a first sudden movement of the at least one of the first and second joint and is further configured to reduce a resistance to movement after the first sudden movement.