#flexible_joint__hinge  a joint that holds two parts together so that one can swing relative to the other
  supertype:  joint  junction by which parts or objects are joined together
  subtype:  butt_hinge  strap_hinge  tee_hinge
  part of:  bi-fold_door  car_door  exterior_door  French_door  gate  swing_door
  part:  pintle  a pin or bolt forming the pivot of a hinge

No statement uses or specializes flexible_joint; click here to add one.