Castors and wheels Hospital bed castors

BS EN 12531:1999 pdf free.Castors and wheels Hospital bed castors.
BS EN 12531 specifies the technical requirements, the appropriate dimensions and the requirements for testing.
This European Standard applies to swivel castors for hospital beds with a wheel diameter of 100 mm or more, which have a central locking device. Swivel castors may be used with the main principal dimensions.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply only to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
EN 12526:1998, Castors and wheels D Vocabulary, symbols and multilingual dictionary.
EN 12527:1998, Castors and wheels 0 Test methods and apparatus.
EN 12530:1998, Castors and wheels 0 Castors and wheels for manually propelled institutional applications.
ISO 7619, Rubber 0 Determination of indentation hardness by means of pocket hardness meters.
3 Definitions
For the purpose of this European Standard, definitions and recommended symbols of EN 12526:1998 apply.
4 Dimensions
The characteristics of a castor are:
D wheel diameter (see Table 1);
D overall height (see Table 1);
D offset (see Table 1);
D fixing system (see 4.1);
D load capacity (see 4.2).
Dimensions listed in Table 1 and Figure 1 shall be used.
For dimensions of non central locking castors used in hospital beds, refer to relevant tables in EN
12530:1998.
4.1 Fixing system
The principal dimension of the fixing system with the central locking are:
D stem length;
D stem diameter;
D distance of the threaded hole centre from the stem collar;
D thread size;
D distance of the hexagon hole centre from the stem collar;
D dimension of the hexagon hole;
D working angle of the hexagon hole.
4.2 Load capacity
Maximum load, in N, which can be carried by a wheel or a castor so as to fully comply to the required acceptance criteria.
5 Requirements
Testing requirements for castors and wheels are listed below. Test methods and apparatus are defined in EN 12527:1998.
5.1 Standard Conditions
5.1.1 Environmental conditions
Tests have to be carried out at a temperature between 15 8C and 28 8C. During the 24 h prior to the test the sample(s) shall remain at the above temperature, in an environment with a relative humidity between 40 % and 70 %.Sample(s) shall not be arifially cooled during testing.
5.1.2 Test sequence
Tests, where relevant, shall be carried out in the sequence as listed in Table 2.
5.2 Initial wheel play
5.2.1 Test objectives, apparatus and procedures Detailed in 4.2 of EN 12527:1998.
5.2.2 Acceptance criteria
The measured initial wheel play shall not exceed the value (W1) in Table 3.
5.3 Initial swivel play
5.3.1 Test objectives, apparatus and procedures Detailed in4.3 of EN 12527:1998.
5.3.2 Tolerances
The tolerances are:
of the swivel play: lever of 200 mm use to measure the play: +2 mm;
angle of rotation of swivelling by 908: +58.
5.3.3 Acceptance criteria
The measured initial swivel play shall not exceed the value (S1).
5.4 Electrical resistance test
5.4.1 Test objectives, apparatus and procedures Detailed in4.4 of EN 12527:1998.
5.4.4 Acceptance criteria
The resistance R of the sample tested shall be:D conductive castor(s) or wheel(s): R # 104 V;D antistatic castor(s) or wheel(s): 105# R# 107 V.
5.5 Fatigue test for locking/braking device
5.5.1 Test objectives, apparatus and procedures Detailed in 4.5 of EN 12527:1998.
5.5.2 Test values The test values are listed below.
5.5.4 Acceptance criteria
The test is passed if there is no wear and/or permanent deformation which adversely affects the performance of the sample.
5.6 Efficiency check of wheel braking and/or locking device
5.7 Efficiency check of swivel braking and/or locking device
5.7.1 Test objectives, apparatus and procedures Detailed in 4.7 of EN 12527:1998.
5.7.2 Test values The test values are listed below.
5.6.4 Acceptance criteria
No revolving movement around its axis is allowed when the force K1 is applied.
5.8.4 Acceptance criteria
The test is passed if there is no permanent deformation of the sample, which adversely affects its performance.
5.9 Dynamic test
5.9.1 Test objectives, apparatus and procedures Detailed in 4.8 of EN 12527:1998.
5.9.2 Test values The test values are listed below.
5.10 Efficiency check of wheel braking and/or locking device Repeat test 5.6.
5.11 Efficiency check of swivel braking and/or locking device Repeat test 5.7.
The test is passed if there is no permanent deformation of the sample, which adversely affects its performance.The reduction of the wheel diameter shall not exceed 2 % of the measured diameter at the commencement of the test sequence.
7 Marking of the product
7.1 Product marking
AlI the products shall be permanently and visibly marked with a name and/or trade mark of the manufacturer.
7.2 Marking of electrically conductive castor(s) or wheel(s)
All products shall bear on their outer surface a clearly visible yellow mark, and where appropriate and possible should include the word antistatic.BS EN 12531 pdf free download.Castors and wheels Hospital bed castors