Apparatus for holding pin in pin-coupled structure

An apparatus for holding a pin in a pin-coupled structure consisting of two or more parts each having a pin slot, with an annular groove formed on an inner surface of the pin slot at a position around an end of the pin slot, and a pin set in said pin slot to couple said parts to each other, wherein the apparatus comprises:

• two pin holding blocks each having a protruding portion on an external surface thereof and made of an incompressible material;
• an elastic member interposed between the two blocks;
• and
• an elastic cushion having a cross-section similar to that of the pin and covering lower ends of said two blocks and said elastic member,
• whereby the apparatus is inserted into the pin slot while being compressed in a radial direction by an external force to reduce an outer diameter thereof with the elastic cushion coming into contact with an end of the pin, and is released from the external force, so the apparatus elastically expands by a restoring force of the elastic member and the protruding portions of the two blocks are seated in the annular groove, thus holding the pin in the pin slot without allowing the pin to be undesirably removed from the pin slot regardless of a relative movement of the pin-coupled parts.