EN 131-4-2020 pdf download.Ladders-Part 4 : Single or multiple hinge-joint ladders.
6.2.4 Cyclic test of hinge joint
These tests are conducted on all hinge joints types with an automatic locking device.
To test their operation, hinge joints (lateral and longitudinal hinge joint ladders) shall withstand the cyclic tests. The pair of hinge joints to be tested shall be fitted in a ladder or part of a ladder with a minimum of two rungs on both sides of the hinges (see Figure 13) shall be subjected to a series of 4 000 cycles from the closed position to the fully open position. The hinge joint shall be locked and unlocked in each of Its positions during the course of each cycle at the normal utilization speed. No oil shall be added to the hinge joints during the tests.
For a ladder which has different types of hinge with different locking positions, each hinge type shall fulfil this test and requirements.
Requirement: Automatic locking function shall operate with no manual intervention for a duration of 4000 cycles.
6.2.5 Test of the ladder in the platform position
6.2.5.1 General
The tests shall be conducted on the complete assembly of decking components with the ladder in the platform position.
6.2.5.2 Strength test of the decking component
Establish the position of the load point for the test in the most unfavourable position (between two rungs) for bending of the decking component.
Place the ladder in the platform position with the horizontal part supported by rollers underneath two adjacent rungs. on the underside of the stiles, so that the feet shall not be In contact with the ground. The rollers shall be cylindrical with diameters between 25 mm and 100 mm and one shall be free to rotate the other shall be fixed. Install the decking components in accordance with the manufacturer’s instructions.
Apply a pre-load F of 100 N as shown in Figure 15 to the load point, distributed over a 200 mm x 200 mm rigid steel plate for a period of 1 mm, The weight of the plate is included in the preload. Care should be taken to apply the load smoothly. Remove the pre-load and establish an origin for measurement, on the underside of the decking component, underneath the centre of the load point.
Apply the test load Fof 1 471 N to the load point distributed over a 200mm x 200 mm rigid steel plate.
The weight of the plate is included in the test load. Care should be taken to apply the load smoothly.
After 1 mm, measure the deformation of the decking component under load. Remove the load and after
1 mm measure the residual deformation.
Deformation under load shall be less than or equal to 1 % of the decking component(s) length or width.
Residual deformation shall be less than or equal to 0,1 % of the decking component(s) length or width. Where there are more than one decking components and they vary in design or in the way they are supported, then repeat the test on each decking component.
6.2.5.3 Strength test of the ladder and decking components in the platform position
With the ladder in the platform position, install the decking components in accordance with the manufacturer’s instructions.
Position a 200 mm x 200 mm rigid steel plate at the centre of the platform’s longitudinal axis with one of its edges aligned against one edge of the decking component.
The test load for non-professional ladders is 2 250 N. The test load for professional ladders is 2 700 N. The weight of the plate is included in the test load
Apply the test load, distributed over the steel plate, for a period of 1 mm. Remove the load and examine the ladder and the decking components for compliance with 6.1.
6.2.5.4 Stability test of the ladders In the platform position
With the ladder In the platform position, install the decking components in accordance with the manufacturer’s instructions.
Apply a load of 750 N distributed over a 200 mm x 200 mm rigid steel plate at the centre of the platform’s longitudinal axis with one of its edges aligned against one edge of the decking component.
The plate shall be centred in the longitudinal direction of the decking component (see Figure 16).
A horizontal test force Fof 300 N shall be applied to the platform level with its upper surface and in the
most unfavourable direction and position.
With the test force applied, the ladder shall not overturn.EN 131-4-2020 pdf download.
EN 131-4-2020 pdf download
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