BS ISO 22879:2016 pdf download

BS ISO 22879:2016 pdf download.Castors and wheels — Requirements for castors for furniture
1 Scope
This document specifies the technical requirements, the appropriate dimensions and the requirements for the testing of castors for furniture.
It is applicable to castors for general furniture applications, but specifically excludes those for swivel chairs and other specialized applications.
NOTE Castors for swivel chairs are specified in ISO 22880.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 22878:2004, Castors and wheels — Test methods and apparatus
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 22877 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Symbols are given in ISO 22878:2004, Annex A.
4 Dimensions and classification
4.1 Characteristics
The characteristics of a castor are
— fixing system,
— castor type,
— dimensions, and
— performance level.
4.2 Fixing system
The fixing system includes the top plates, stem and circlip, threaded stem and other fixing systems.
Fixings shall be chosen with reference to the application of the castor.
4.3.2 Type H
Castors with plain wheels are defined as Type H, hard tread.
These castors are suitable for carpeted floors.
4.3.3 Type W
Castors with resilient tyred wheels are defined as Type W, soft tread.
These castors are suitable for hard stone, wooden or tiled floors, or those featuring non-textiled
covering.
4.3.4 Type C
These castors are electrically conductive. Type C castors may have a hard or soft tread.
These castors should have either modified Type H or Type W wheels.
4.3.5 Type S
These are inclined axle castors.
4.4 Dimensions
Figure 1 to Figure 3 show typical castor designs. Table 1 shows the specified dimensions and the corresponding symbols.
The wheel(s) of a fixed castor shall conform to the dimensions shown in Figure 1, Figure 2 or Figure 3 (as appropriate).
4.5 Performance level
The requirements for castors will vary depending on the environment in which they are intended to be used. The levels are shown in Table 2.
5 Requirements for testing
5.1 General
Test apparatus and procedures shall be as specified in ISO 22878.
5.2 Standard conditions
5.2.1 Environmental conditions
Tests shall be carried out at a temperature between 17° C and 23° C. During the 24 h prior to the test,the samples shall remain at the specified temperature, in an environment with a relative humidity between 40 % and 70 %.