A collapsible resistance exercise device for compact storage and quick deployment includes a horizontally disposed base support frame and an upright frame pivotally attached to the base frame. The upright frame includes a resistance bar pivotally mounted thereon. In practice, the device is placed on...http://www.google.com.tw/patents/US7137937?utm_source=gb-gplus-share專利 US7137937 - Collapsible resistance exercise device
