| 摘要 |
PURPOSE: To secure the engagement of three elements with one another for support with a load to be applied to any one of structural parts by providing the device with a first support having a first conical trapezoidal surface, a shelf having a first conical trapezoidal hole, and a second support having a second conical trapezoidal hole formed so as to be engaged with the first conical trapezoidal surface. CONSTITUTION: When a bottom part leg 16 is inserted into a horizontal shelf 10, a conical trapezoidal surface 20 is fitted in a conical trapezoidal hole 12 by flush fitting. This structure can support a load to be applied onto the shelf 10. When an upper leg 2 is inserted into the bottom part shelf 16 through the horizontal shelf 10, each pair of conical trapezoidal surfaces 4, 24 and 12, 20 work so as to lock the structure. Furthermore, when a downward force is applied to the leg 2 and/or the shelf 10, a taper-shaped surface generates the horizontal force within the locking structure, and works so as to strongly lock a connection part. Consequently, the downward force applied to the leg 2 locks the pair of conical trapezoidal surfaces 4, 24 and 12, 20. Similarly, a load applied to the shelf 10 gives the similar effect. Consequently, this locking structure can secure the stabilized structure, which can support a large weight. |
