Impact absorbing device

An impact absorbing device comprising:

• an impact absorption pipe arranged so that the impact absorption pipe can slide axially and coaxially within an installation opening, the impact absorption pipe having an impact absorption pipe upper part, an impact absorption side wall part and impact absorption pipe bottom part, the impact absorption pipe bottom part having an opening on the interior side of the impact absorption pipe bottom part, the impact absorption pipe bottom part also having at least one of a flange which projects in an exterior direction and a flange which projects in an interior direction, an impact absorption pipe side wall part which absorbs external impacts, the side impact absorption pipe side wall part having a concave recessed part arranged on the interior of the impact absorption pipe side wall part, and at least the upper side of the concave recessed part formed so that the concave recessed part slants from the upper side to the lower side of the impact absorption pipe;
• a resistance component arranged so that the resistance component can slide axially and coaxially within the impact absorption pipe, the resistance component having a resistance component upper part, a resistance component the wall part and a resistance component bottom part, the resistance component side wall part having one or more holes;
• one or more movable resistance bodies arranged so that the one or more movable resistance bodies can move freely within the one or more holes of the resistance pipe side wall part, the one or more movable resistance bodies being formed of a harder material than that of the resistance pipe side wall part;
• an impact absorption pipe movement component which provides an energization power to the impact absorption pipe, the impact absorption pipe movement component being arranged between the impact absorption pipe upper part and the resistance component upper part;
• a support part movably arranged within the resistance component, the support part having a support part upper part and a support part side wall part, the support part upper part having a flange which projects towards the interior, the support part side wall part having first and second sections formed in this order so that a distance between each of the sections and an interior side wall of the resistance component becomes smaller respectively, with the first section being in a position which is above the second section, and with the first section being in a position which faces the one or more holes of the resistance component when the support part comes into contact with the resistance component bottom part;
• and
• a support part movement component which provides an energization power to the support part, the support part movement component being arranged between the support part upper part flange and the resistance component bottom part.