Patent ID: 8408095

Claim:
A bi-directional different-speed-ratio driving device with bi-directional manpower input, comprising: a bi-directional manpower-driven input device ( 101 ) arranged to be driven in both a first direction and a second direction opposite to the first direction, said input device ( 101 ) having a bi-directional output; a bi-directional different-speed-ratio speed change device ( 102 ) having a bi-directional power input directly or indirectly connected to the output of the manpower input device ( 101 ), said speed change device ( 102 ) having a speed change device output, wherein a speed change ratio of the speed change device ( 102 ) depends on a rotating direction of the bi-directional power input from the manpower input device ( 101 ) so that changing a rotating direction of the output of the manpower input device ( 101 ) changes a rotating speed of the speed change device output; a load ( 103 , 105 , 106 , 107 , 108 , 109 , or 112 ) directly or indirectly driven by the speed change device output, whereby rotation of the input device ( 101 ) in different directions exercises a variety of different muscles to reduce injuries and improve muscle strength and density of the different muscles.