EN 12532:1998 Clause 5.9/ EN 12527:1998 Clause 4.8

EN 12532:1998 Clause 5.9/ EN 12527:1998 Clause 4.8

- When tested in accordance with Clause 4.8 of EN 12527, this test applies to:

 - castors for institutional applications;

 - castors for hospital beds;

 - castors for applications up to 1.1 m/s (4 km/h);

 - castors for applications over 1.1m/s and up.

This test is to verify that a load capacity, under a dynamic application, will not cause damage and/or excessive wear to be a prejudice to the performance of the castor or wheel under test.

(1) Apparatus: The test apparatus is:

 a) A machine, which can have either a linear or a circular track in a horizontal or vertical position (see following figure) with a smooth steel surface and shall be able to run the sample at speeds as v1 and v2 and apply a load as L1 and Clause 4.1.3 (The test load shall always be applied directly so that its centre of gravity lies central to the mounting plane of the castors, or the centre of the test frame – on which the samples under test are mounted.) Rectangular metal obstacles shall be placed on the track at 45° to the running direction, alternately to the right and left of it. The obstacles shall be 100mm wide, height as per h1 and featuring rounded edges with radius of 1/3 of its height. Such radius cannot be larger than 5mm and less than 1.5mm. The obstacles shall be positioned as c.

b) A time measuring instrument.

c) Portable hardness meter.

(2) Procedure: The castor or wheel is placed in the test apparatus with a correct fitting. EXAMPLE: Fitted with all fixing bolts, and correctly tightened. The test consists of a continuous running period with a duration of z1, which may be followed by a pause z2. The direction of travel must be reversed at the commencement of each new running period when either of the circular track dynamic test machines is used. The castor shall be made to run, under load, until it has passed a number of obstacles n. When the total number of revolutions r1 specified exceed the revolutions required with obstacle contact the obstacles are removed and the test procedures until all necessary revolutions are completed. The obstacles shall be removed in a period of time not exceeding z1.

(3) Test values: The test values are listed below.

(4)Tolerances: The tolerances are:

- After testing, it’s passed if there is no permanent deformation of the sample, which adversely affects its performance (Clause 5.9 of EN 12532)