| 摘要 |
PURPOSE: To simply mount and fix a cover frame at a box frame without welding by sandwiching inner and outer side edges of corner fittings by gaps provided at the side frames and bent pieces, and coupling the orthogonal corners of the side frame by coupling fittings. CONSTITUTION: The outer edges of corner fittings 11 formed in an L-shape are sandwiched fixedly at gaps 10' formed at the peripheral edges of the bent piece 9 of a front frame 7. Protruding strips 13 protrude from the same height positions as protruding strips 10 provided at the piece 9 at the lower end side of the outer surfaces of side plates 8a-8d split and formed at a side frame 8, and a gap 12' is formed at the lower part. The inner edges of the fittings 11 formed in the L shape is sandwiched fixedly in the gap l2'. A coupling fittings 18 provided at a nipping piece 17 at both end outsides in a plane L shape are crossed at the inner edges of the corners perpendicular to the frame 8, the piece 17 is sandwiched, and the ends of the plates 8a-8d are perpendicularly fixed. |
