Abstract: Systems and methods are provided for capturing linear motion and converting it to energy may augment existing power grids, and may be installed in existing infrastructure. In some examples, a system may be installed in a roadway to capture the linear motion of automobiles, so that it may be converted first to rotational motion, then to energy. In other examples, systems may be installed in railways, sidewalks or other areas to capture and convert linear motion from trains, bicycles, walkers and other moving objects. In yet other examples, the linear motion from a package moving along a series of spindles arranged linearly may be captured and eventually converted to energy.

Abstract: A two piece tennis racket comprising a strung, oval shaped head and a detachable handle unit which includes a grip forming portion and a head attachment portion which is preferably collapsible into or about the grip portion to accommodate compact stowage. The head and attachment portion are adapted to include suitable fastening means for allowing speedy connection and disconnection of the handle unit to the head.