Patent ID: 9700808
Date: 2017-07-11
CPC Classifications: A63H,B65D

Claim:
1. An apparatus for use with a tube structure having first and second opposing ends, at least the first of the ends of the tube structure including an opening that can be covered, the structure including a wall which extends from the first end to the second end, the tube structure occupying an erect position when the first end is above the second end, the apparatus including: a cover piece configured to be removably attached along the first of the ends to cover or close the opening by placement of the cover piece in or about the opening; at least a first rod member having first and second opposing ends, the first rod member end having a direct connection to the cover piece without any other structure there between, said connection between the first rod member end and the cover piece being a fixation point of attachment at the removable cover piece, this enabling pivotal movement of the rod member with swinging motion about the fixation point of attachment of the rod member to the removable cover piece, with the second rod member end positioned away from the cover piece; and a first mass attached to the second end of the rod member, so that the first mass is connected to the cover piece by only a single rod member and wherein, with the mass connected to the rod member: (i) the first mass and the rod are only removeable from the tube structure by removing the cover piece from the tube structure; and (ii) when the second rod member end and the mass are positioned within the tube structure, both the single rod member and the mass can be swung based solely on pivotal movement about the fixation point of attachment at the cover piece, causing the mass to hit the wall, wherein the rod member has sufficient stiffness under inertial forces to limit travel by the mass toward the cover piece when the tube structure is in a non-erect orientation.