Office Chair-Back Strength Tester
CNS 3089 S1072
1. Seat’s on-load durability and back structure strength of office chair: exert 55kgs force on the seat surface by pulling up chair seat or pushing out back plate, making chair’s front feet suspend above floor for over 50mm, then put it down to floor surface. And repeat this process for certain cycles according to different chair sort. Then, take out the chair and observe if any crack or damage is found on it, on particular the welded joints or connecting portion.
2. Back’s structure strength: fix the chair on floor and constantly exert 60kgs force to the back part for 5 consecutive seconds ; repeat this process for 30 times, then, take the chair out and observe if any crack or damage is found on it, on particular the welded joints or connecting portion.