Lockable or releasable wheel system with bidirectional input and one-way output

A lockable or releasable gear train with bidirectional input and one-way output, wherein a rotatable shell or rotatable parts of the gear train are locked when the bidirectional input is driven in either of a first rotary direction and a second rotary direction opposite the first rotary direction to drive a first rotary direction output, and wherein the rotatable shell or rotatable parts of the gear trains are released through operation of the lockable or releasable mechanism when the output shaft is driven in a reverse rotary direction by a reverse driving force on the output shaft, to prevent the gear train from becoming jammed, and wherein:

• the bidirectional input shaft of the gear train has said first rotary direction and said second rotary direction opposite the first rotary direction;
• if the input shaft is driven in the first rotary direction, the first rotary direction output is produced by a first driving gear train driving the output shaft;
• if the input shaft is driven in the second rotary direction, the first rotary direction output is produced by the second driving gear train driving the output shaft;
• a one-way transmission is installed between the first driving gear train and the second driving gear train to avoid interference from the second driving gear train when the first driving gear train is driven by the input shaft in the first rotary direction to produce the first rotary direction output;
• a second one-way transmission is installed between the second driving gear train and the first driving gear train to avoid interference from the first driving gear train when the second driving gear train is driven by the input shaft in the second rotary direction to produce the first rotary direction output;
• the lockable or releasable mechanism is installed between the rotatable shell of the gear train and a machine body, or between the fixed shell and rotating parts of the gear train, to prevent the gear train from locking when the output shaft is driven in the second rotary direction by a reverse driving force on the output shaft;
• and
• the input shaft is connected to at least one input power source for rotating the input shaft in the first or second rotary directions, said at least one input power source including at least one of a human input power source, a machine input power source, an electric input power source, a fluid input power source, an electric input motor, a hydraulic input motor, and a pneumatic input motor.