Body weight support system and method of using the same

A body-weight support system for use with a person, comprising:

• a track;
• a support, the support being supported on the track, the support being movable in a first direction and in a second direction opposite to the first direction, the support including a drive mechanism to move the support along the track;
• an elongate member, the elongate member including a first end and a second end, the first end of the elongate member being coupled to the support;
• a harness assembly, the harness assembly being coupled to the second end of the elongate member and configured to be mounted to the person;
• a control system, the control system being configured to detect at least one of the movement of the person relative to the support, the movement of the support along the track, and a change in the amount of force applied to the elongate member;
• and
• an adjustment system, the adjustment system being connected to the control system and engaged by the elongate member, the adjustment system being configured to vary at least one of the position of the support and the amount of force applied to the elongate member based on information detected by the control system, the adjustment system including a first plate and a second plate spaced apart from the first plate, the second plate being freely movable relative to the first plate during operation of the system, the control system including a series elastic actuator that is used to control tension in the elongate member, the adjustment system also including a pulley coupled to the second plate and located in an area defined between the first plate and the second plate, wherein the series elastic actuator includes an elastic member and a detector, the detector is configured to detect a change in length of the elastic member, the amount of force applied to the elongate member can be varied based on the detected change in length of the elastic member, the elastic member being located between the first plate and the second plate and compressed when an additional force is applied to the elongate member, the elongate member being engaged with the pulley and moving the second plate toward the first plate when the additional force is applied, and the elongate member is a rope.