Passive ankle assist apparatus with torsional coil spring

A passive ankle assist apparatus with a torsional coil spring, the passive ankle assist apparatus with a torsional coil spring for assisting an ankle joint of a user in a state of being mounted on a shoe worn by the user, comprising:

• a shank frame mountable on a shank of the user, the shank frame comprising a guide hole;
• the torsional coil spring comprising a coil part provided in a state of being wound around a central portion a plurality of times, the torsional coil spring slidable along the guide hole;
• a support part configured to support the coil part;
• a coupling frame configured to support the support part, the coupling frame couplable to the shoe;
• an engaging part formed to extend downward from the coil part, the engaging part engageable with the coupling frame based on an angle formed by the shank frame and the coupling frame;
• and
• a sliding part formed to extend upward from the coil part, the sliding part slidable along the guide hole,
• wherein
• the coupling frame comprises a frame hole configured to receive the engaging part, and
• the engaging part comprises:
• an extension rod formed to extend in parallel with an outer surface of the coupling frame;
• and
• an engaging rod bent and formed to extend from one end of the extension rod, the engaging rod configured to pass through the frame hole.