| 摘要 |
PROBLEM TO BE SOLVED: To easily move a heavy weight such as a vaulting house, etc. SOLUTION: Two pieces of support plates 4 and two pieces of fixed plates 5 are respectively connected to each other by hinges 6 free to revolve, the support plates 4 are made to overhang outward in the cross direction by making them contact with two points of recessed parts 3a formed on grounding parts 3 of the lowest stage frame 2 of a vaulting box 1, and the fixed plates 5 are installed on lower end parts of an inside surface of the lowest stage frame 2. A torsion spring to constantly energize the support plates 4 in a direction to overhang outward is assembled on a connecting part of at least one of the support plates 4 and the fixed plates 5. A space part is formed inside of a connecting member by outer end side parts of the support plates 4 to each other by the slender connecting member and integrating them.
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