The treadmill has a tread base that is rotatably attached to and between a left upright and a right upright. The tread base is rotatable between a first position for performing exercises and an upright or storage position. A latching structure is provided to latch the tread base to the support...http://www.google.com.au/patents/US5772560?utm_source=gb-gplus-sharePatent US5772560 - Reorienting treadmill with lift assistance
