Fatigue test machine HD-F734

durabilitycomputer-controlledfor chair

Chair Strength & Durability Tester DESCRIPTION The machine is designed to test office chair back strength. It with PLC controller, touch screen interface to input test parameters, test force and times can be set. Section 5 Backrest Strength Test – Static- Type I Test Procedure: A force of 667N (150lbf) or 1001 N (225 lbf) shall be applied to the backrest at the backstop position for 0ne minute. Angle 70 ± 10 degrees, If the backrest/tilt lock mechanism will not accept the load due to gradual silpping of the adjustment mechanism during the load application, set the backrest to its most rearward(stopped) position, then apply the specified load(s). Remove the load Section 6 Backrest Strength Test – Static- Type II & III Test Procedure: Same with section 5, only the force should be 667N (150lbf) or 1001 N (225 lbf), Angle 90 ± 10 degrees. Section 14 Backrest Durability Test - Cyclic - Type l Test Procedure: For chairs with backrest widths less than or equal to 406 mm (16 in.) at the height of the loading point, apply the load to the backrest for 120,000 cycles. For chairs with backrest widths greater than 406 mm (16 in.) at the height of the loading point, apply the load to the backrest for 80,000 cycles.