住宅用椅子の耐久試験法の一提案 : 椅子の構造設計に関する基礎研究(2)

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According to the first report [Measurement of loads applied on chairs] by the present authors the greatest stress is measured when the dynamic sitting posture is taken. We developed a new repeating impact testing machine that gives the loads similar to the ones caused when the dynamic sitting posture is taken, and we named this testing method by our new machine F.T. method. The durability of the chairs was measured both by F.T. method and by J.J.S. method, and the results were compared. The width of legs of the chairs used in the experiment has two sorts and that of the rails has three sorts. The joint construction used was of mortise-and-tenon joint or of dovel joint. According to the result of the experiment, the impact load caused when J.I.S. method is applied is excessively larger than that which caused when F.T. method is applied, and it was made clear that the durability cannot be compared by M.S. method, though the strength of the chair can be compaired by it. The results obtained by F.T. method are summarized as follows; 1) The durability of the chair with wider legs and rails is more excellent than that with narrower ones, and the durability of it with wider legs is better than that of it with wider rails. 2) The chair with mortise-and-tenon joints is far stronger than that with dovel joints. 3) The mortise-and-tenon joint with longer tenon is stronger than that with shorter but wider tenon when the glue area is equal. 4) According to the result, it can be found that the chair with ten or fifteen years of durability needs to endure the repeating impact loads of at least 7,000 or 12,000 times by F.T. method.
日本デザイン学会の論文
1975-03-30

住宅用椅子の耐久試験法の一提案 : 椅子の構造設計に関する基礎研究(2)

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