Office chair cushion wear-resisting durability test cycles

11. 1 this test for each type of chair serviceability. 11. 2 test objective the purpose of this test is to evaluate the seat cushion under vertical downward load caused by the fatigue stress and wear ability. 11. 3 impact test 11. 3. 1 test steps a) Put chair sits above test platform, to ensure that the seat cushion can hit. Fixation artifacts can't become a chair or providing support, or limitation of chair response to the shock action. If there is a castor, taste should be first to place it in the worst conditions ( Typical case is the castor and chair foot legs into a 90 degree Angle) 。 b) Dispatch all function to normal conditions of use. c) Chair cushion thickness less than 44 mm ( 1. 75年) , the bubble will increase the thickness of 50 + / - 6 mm. Any additional in bubbles on the surface of the seat cushion should have 25%, to 200 + 22 n of serrated force deviation ( IFD) 。 d) The diameter of 400 mm ( 16。 ) , weight 57 kg ( 125Ib. ) Sand/sandbag connections on the frequency meter, sand/first sandbag suspension in the center of the not compressed cushion above 25 mm ( 1。 ) , then let it free fall on the seat cushion ( See figure 11. A) 。 Other strength equal impact way also can accept. The added value of test process, the drop height more than 13 mm ( 0. 5) Should be to adjust the drop height and/or seat cushion thickness. The frequency meter should be set to 10 - per minute Appropriate frequency of 30 times. e) Sand/sandbag placement should be present under the freedom of gasket around the edge of the central axis, and the distance from the top surface of the back of the chair can't more than 13 mm ( 0. 5) Fall, in the process of sand/sandbag can't contact with the back of the chair. 11. 3. 2 tests for chair 100000 times test. 11. Four seat front two Angle of load testing - — Cycle/number ( The center position) 11. 4. 1 complete 11 test steps. The impact of the three tests, a diameter of 203 13 mm (+ / - 8±0. 51) Edge load device and the seat cushion has the ground placed on the seat cushion a corner on the front. Through the seat cushion 734 n ( 165 LBS) Of the load. If the armrest may cause obstacles for the load device placed, the handrail should be removed; If the armrest sealed ( Or regulation) , the load device must be placed handrail where no obstacles. 11. 4. Per minute 10-2 test procedure 30 times the appropriate frequency to lift the load device completely from the seat cushion and put down, careful not to cushion the impact, make its can not withstand the load by means of frequency meter's support. The test for 20000 times. Then, put on the load device seat in a corner of the front end, to repeat the test again 20000 times. Note: in this part of the test, to test again, in the opposite order to make every corner tested a total of 40000 times. 11. 5 to accept in the above two parts after the test, the chair can't lose its usability.

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