Abstract: A flexible coupling for a drive train, the coupling having a drive yoke, a driven yoke, and a connector for transferring rotational torque between the yokes. The drive and driven yokes are manually inserted into slots in the connector. The drive yoke connects to a drive shaft and the driven yoke connects to a driven shaft. Rotating the drive shaft rotates the drive yoke against the connector causing it to rotate; which in turn transfers torque to and rotates the driven yoke. Surfaces on the yokes and connector that contact one another during rotation define contact surfaces. Portions of the yokes and/or connector having the contact surfaces are obliquely profiled so that contact surfaces on the yokes are complementary to corresponding contact surfaces on the connector, which increases the areas of force transfer between the yokes and connectors to reduce stress concentrations.

Abstract: An exercising device for animals, such as dogs, horses, and the like, comprises a harness for attachment to the chest region of the animal. First and second leg bands are attached to the rear legs of the aninal at its hocks, and an elastic cord interconnects these first and second leg bands with the harness through a pulley attached to the harness in the chest region of the animal. The length and tension of the elastic cord are selected to cause additional dynamic tension to be applied between the rear legs and the chest of the animal when the animal is walking and running, while at the same time permitting normal movement of the animal. Thus, increased exercise and muscle build-up of the animal occurs under all conditions of exercise of such animal.

Abstract: An exercising device for animals, such as dogs, horses, and the like, comprises a harness for attachment to the chest region of the animal. First and second leg bands are attached to the rear legs of the animal at its hocks, and an elastic cord interconnects these first and second leg bands with the harness through a pulley attached to the harness in the chest region of the animal. The length and tension of the elastic cord are selected to cause additional dynamic tension to be applied between the rear legs and the chest of the animal when the animal is walking and running, while at the same time permitting normal movement of the animal. Thus, increased exercise and muscle build-up of the animal occurs under all conditions of exercise of such animal.