| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To increase constraining force between units. <P>SOLUTION: A side part of a unit 1 having a square planar shape is provided with a locking protrusion 3 protruding outward and a locking recess 4 corresponding to the planar shape, at positions equidistant from the middle point of the corresponding side. A surface of the locking protrusion 3 is provided with a pin 6 protruding upward, and a unit surface at a line symmetrical position with respect to an extension line of the corresponding side as an axis of symmetry is provided with a pin insertion hole 7 to form this unit connection joint. The relative displacement between the units 1 arranged adjacently in a horizontal direction in the horizontal direction perpendicular to the unit arrangement direction is constrained by the engagement between the locking protrusion 3 and the locking recess 4, and the unit 1 to be adjacently arranged is mounted on the upper side in a vertically inverted posture. In this state, for the units 1 mutually positioned in an oblique direction, the relative displacement in the horizontally separating direction is constrained by the pin 6 and the pin insertion hole 7, and the relative displacement in the vertical direction is constrained by bringing the locking protrusions 3 into contact with the mutual units 1. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
