IS 5416 Part 2 (1988) outlines standardized procedures to evaluate the stability of various chairs and stools, including upright, reclining, tilting, and easy chairs. This code assists designers, manufacturers, and testers in verifying that seating furniture can resist tipping forces under typical usage conditions, promoting safety and product reliability.
Overview
IS 5416 Part 2 (1988) outlines standardized procedures to evaluate the stability of various chairs and stools, including upright, reclining, tilting, and easy chairs. This code assists designers, manufacturers, and testers in verifying that seating furniture can resist tipping forces under typical usage conditions, promoting safety and product reliability.
Audience
Contents
Structure
Frequently Asked
IS 5416 Part 2 (1988) applies to stability testing of various furniture including upright chairs and stools, easy chairs, tilting chairs, and reclining chairs. The standard focuses on verifying the stability performance of these types to ensure safe and reliable use in typical conditions.
Loading points are established using a specialized Loading Point Template that consists of two pivoted members set at 90°, designed to indent upholstery under moderate pressure. The template is positioned along the chair's centerline as far back on the seat as possible, with the back portion pressed into the backrest and the seat portion levered forward to match the chair contours. Loading points are then marked accordingly. For swivel bases, the base is rotated to the position most likely to cause overturning before securing.
For chairs without arms, a vertical load of 600 N is applied 50 mm from the seat edge with an additional 20 N horizontal force at the loading pad’s contact point. For chairs with arms, vertical forces of 250 N and 350 N are applied at specified lateral and forward offsets, along with a 20 N horizontal force on the armrest. Rear overturning tests apply a 600 N vertical load and a horizontal force calculated based on seat height, typically 80 N if the seat height exceeds 720 mm, or proportional to height if less.
IS 5416 Part 2 mandates placing 11 discs on the seat for tilting chairs with tilt angles between 0° and 55°, ensuring discs are pressed firmly against the backrest contour. If discs extend beyond back height, light supports are used to prevent sliding. Reclining chairs without footrests are tested up to 55° tilt, while those with footrests are tested up to 45°. These tests simulate realistic use positions to assess stability during tilt or recline.
A chair or stool is considered to pass the stability test if it remains upright and does not tip over when subjected to specified vertical and horizontal loads applied at designated points. For stools, stability is confirmed if the feet rest firmly against the stops, a 600 N vertical load is applied 50 mm from the edge near the stopped feet, a 20 N horizontal force is applied at the seat center towards the stops, and the front edge of the seat is displaced 100 mm horizontally without overturning or deformation.
Ask AI about any clause, requirement, or provision in IS 5416 PART 2. Get instant, clause-cited responses powered by our indexed library.
Free tier includes 150 queries (50 AI + 100 Reference) · No credit card required