Abdomen exercise device

Year	Description
2001	Invention patented by Ming-Hui Chen on June 3rd, 2001. Abstract: An abdomen exercise device includes a bed body having a backrest and a seat pivotally connected with a joint to permit the backrest swing up and down to force the back of a user lying on the bed body bend the back up and down to exercise the user's abdomen. The backrest is swung up and down by a drive rod moved by a drive device consisting of a motor, a drive wheel, and a chain gear fixed with a lower end of the drive rod and a drive chain gear fixed eccentrically with the drive wheel rotated by the motor. With an endless chain extends around the drive chain gear and the chain gear to let two ends of the drive rod seesaw to swing up and down the backrest automatically.
Source: selected by the editor from original sources.

Invention: Abdomen exercise device