ISO 24496-2021 pdf free download.Office furniture – Office chairs – Methods for the determination of dimensions.
This document specifies methods for the determination of the dimensions of office chairs. This document does not contain dimensional specifications or requirements.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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NOTE For the anthropometric equivalents of the terms and definitions, see Annex B.
3.1 angle between backrest and seat V angle between the loaded backrest and the loaded seat
Note 1 to entry: See Eii.irc 1.
3.2 armrest height distance from the top surface of the armrest to the bottom of the loaded CMD buttocks pad parallel to the backrest line at a distance of 214 mm from the backrest line
Note 1 to entry: See Figure 2.
3.3 armrest length distance along the armrest within an envelope down from the top of the armrest that is 20 mm deep
Note 1 to entry: See Figure 3.
3.4 distance between armrests horizontal distance between armrests from the rear of the seat surface width zone forward to the front edge of the seat within the measurement zone 5 mm down from the top of the armrest
Note 1 to entry: See Figure 4, Figure 6 and seat surface width zone (3.27).
4 General measurement conditions
4.1 General
Caution shall be used to ensure that any chair movement, adjustments and/or applied forces do not dislodge the CMD causing injury to the user or damage to the CMD.
4.2 Preliminary preparation
The chair shall be assembled and/or configured according to the instructions supplied with it. If mounting or assembly instructions are not supplied, the mounting or assembly method shall be recorded in the report.
All adjustments shall be operated through their range of adjustments at least one time before measurements are taken.
If a measurement cannot be taken as specified in the procedures due to the design of the product, it shall be carried out as far as possible as described, and deviations from the measurement procedure shall be recorded in the test report.
The test shall be carried out in indoor ambient conditions. If during a test, the temperature is outside of the range of 15 °C to 25 °C, the maximum and/or minimum temperature shall be recorded in the test report.
4.3 Tolerances
The following equipment tolerances shall be applicable unless otherwise specified:
— Forces: specified in the relevant clauses;
— Masses: ±1 % of the nominal mass;
— Dimensions: ±1 mm of the nominal dimension;
— Angles: ±10 of the nominal angle.
Test masses, forces, dimensions and angles shall be targeted at the nominal values specified.
4.4 Measurement uncertainty
The measurement uncertainties according to Table 1 shall be applicable unless otherwise specified.
A rationale explaining the background of the measurement uncertainty is contained in C.6.ISO 24496 pdf free download.