| 摘要 |
PROBLEM TO BE SOLVED: To develop a joist system capable of having difficulty making a fall in a stable state, facilitating the height adjustment and having the excellence in workability and strength without having any deflection in a joint between both joist materials. SOLUTION: The joist materials forming a groove in the longitudinal direction in the side face are consecutively provided. A joist keeper supporting a connecting section of each joist material and a rise section is formed in the upper surface of a joist cross-piece of the joist keeper supporting an intermediate section of the joist material, and a projected stripe fitting to the groove of the joist material is provided to the upper part thereof. Assembly of the joist system is easy, and since the end sections of the adjoining joist materials are supported by one joist keeper, the height adjustment becomes easy. Since the end section of the joist material is supported by the joist keeper, the creak of an upper floor is prevented, and it is excellent in strength. COPYRIGHT: (C)2007,JPO&INPIT
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