US Patent 7651445 Elliptical trainer

An elliptical trainer has a base, a flywheel, two four-bar linkages and two handles. The base has a bottom frame and a support mounted on the bottom frame. The four-bar linkages are mounted pivotally on the support and each four-bar linkage has a front link, a rear link, an upper coupler and a lower link. The handle assemblies are mounted pivotally on the support and pivotally connected respectively to the four-bar linkages. Because the four-bar linkages and the handle assemblies are structured compact and simple, fabrication, carrying and maintenance of the elliptical trainer are convenient.