Patent ID: 9254892
Filing Date: 2016-02-09
CPC Classification: B63B,G01V

Claim Text:
1. A fixation releasing device comprising a connection device configured to separatably connect a buoyant body and a weight disposed under the buoyant body, the connection device including a trigger mechanism configured to release connection between the buoyant body and the weight when the trigger mechanism comes into an operation state by a trigger signal, wherein: the connection device includes: a closed loop member including one or more portions to be fusion cut that are formed of a thermoplastic material; and a connection structure disposed between the closed loop member and the weight, and configured to restrain the buoyant body when the closed loop member is in a closed state and to release restraint of the buoyant body when the closed loop member comes into an open state; the trigger mechanism includes: one or more fusion cutting devices configured to fusion cut the one or more portions to be fusion cut in the closed loop member, thereby bringing the closed loop member into the open state when the trigger mechanism comes into the operation state; the closed loop member is disposed to surround a top portion of the buoyant body; the connection structure includes: the engaging portions are each constituted from an engaging ring; the engaging mechanisms each have a structure including: a rotation arm configured to rotate about the center of rotation in a direction toward the buoyant body and in a direction away from the buoyant body; a first engaged portion provided at a side portion of the rotation arm on a side of the buoyant body, whereby the engaging ring is engaged with the first engaged portion; and a second engaged portion provided at a side portion of the rotation arm opposite to the side of the buoyant body and located at a position more outward than the first engaged portion as seen from the center of rotation, whereby the closed loop member is engaged with the second engaged portion; the plurality of connection members are each sized to generate a force configured to rotate the rotation arm about the center of rotation in the direction away from the buoyant body when the engaging ring is engaged with the first engaged portion and the closed loop member is engaged with the second engaged portion; the engaging mechanisms share an axial member in a shape of closed loop, disposed closer to the weight than the closed loop member and forming the center of rotation; and the rotation arm has a through hole formed therein, whereby the axial member passes through the through hole.