| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lattice structure which facilitates connection of beams 4 to cross beams 2 without link members or an adhesive. <P>SOLUTION: Both the cross beams 2 and the beams 4 have absolutely the same I-shaped cross section. More specifically, they are each formed of a relatively thin and long web 2b, 4b, and relatively thick flanges which are longitudinally symmetrically arranged at both the upper and lower edges of the web and laterally symmetrically overhang from the web. The cross section of each flange 2a, 4a has almost half-round recessed grooves 2c, 4c symmetrically formed therein. To build the beam 4 into the cross beam 2, the beam 4 is cut at its web 4b at right angles, and the flanges 4a are further cut away from the cut edge of the web 4b. Further both the upper and lower edges of the web 4b are cut away like a key to form a key-like notches 4d, and the key-like notches 4d of the beam 4 are fitted into the respective round recessed grooves 2c of the cross beam 2. <P>COPYRIGHT: (C)2004,JPO |
