| 摘要 |
PROBLEM TO BE SOLVED: To join base frames mutually and secure legs of an upper side wooden frame to the base frames by using a connecting device. SOLUTION: As a screw 25 is screwed and fit into a screw hole 23, which is formed at the end of the base frame 13 so that the screw hole 23 becomes open to an inner surface of the base frame 13, from inside a piece 18 in contact with the base frame through a penetrating hole 19 for a screw found on the piece 18 in contact with the base frame, the base frames are joined mutually through the connecting device 17 in a manner that they can be attached and removed. A screw hole 29 is formed on the leg 28 of the upper side wooden frame 27 designed to put on a piece 20 for receiving the leg and the upper sides of the base frames in a manner that the screw hole becomes open to the underside of a leg 28. The leg 28 is secured to the connecting device 17 in a manner that it can be attached and removed when a butterfly screw 31 is screwed and fit into the screw hole 29 from the bottom of the piece 20 for receiving the leg through a penetrating hole 21 for a screw of the piece 20 for receiving the leg.
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