EN 13634-2017 pdf download.Protective footwear for motorcycle riders-Requirements and test methods.
6.2 Impact energy protection of ankle and shin
6.2.1 Principle
The minimum zones of protection are marked on the footwear using the templates as shown in Figure 2 and Table 5. The performance of the materials in the zones of protection is determined by impact testing. A modified apparatus of the type specified in EN 1621-1 shall be used. The sample is placed on a shaped anvil mounted on a load cell. A falling mass strikes the sample and the force registered by the load cell is recorded.
6.2.2 Apparatus
An apparatus as specified in EN 1621-1 shall be used with the following modification. For the ankle testing the anvil shall be constructed of steel with a hemispherical top surface with a radius of curvature of 25 mm ± 0,5 mm, and a height of at least 100 mm above the load cell. For testing the shin zone of protection the anvil shall consist of three vertical steel plates 25 mm ± 0,5 mm thick, attached to a flat base which is securely bolted or clamped to a concrete or similar massive base of at least 1 000 kg. The top edge of the plate shall be a half round section with a 12,5 mm ±0,5 mm radius. The centre section of the plate 50 mm ± 1 mm wide shall be mounted vertically on the plezoelectric load cell or equivalent force transducer. The force transducer shall be bolted onto a flat base which shall be connected to a rigid mass of at least 1 000 kg. The section of the plate on the load cell shall be set between and in line with, sections of the plate mounted on the base that are at least 150 mm in length. There shall be a clearance of 1 mm ± 0.5 mm at each end of the free section. The half round top edge of the free section of the plate and the fixed end parts shall be at the same level ± 1 mm. The plate shall have a height of at least 200 mm. Figure 6 illustrates the principle of the design of the apparatus.
The anvil shall be positioned so that the long face of striker is at 90° ± 2° to the long axis of the anvil, and so that the centre of the striker would hit the centre of the anvil ± 2 mm. The anvil shall be provided with a clamping system for securing test specimens. A system of elastic straps, exerting a force of 5 N to 10 N has been found suitable.
The footwear shall be put on by an appropriate subject with feet of suitable size for the test footwear and wearing motorcyclist’s protective trousers correctly fastened with the subject standing upright. The centre point of the ankle shall be marked — this Is denoted as Point X on Figure 2. The midline of the front of the shin shall be marked on the footwear. The point where this line intersects the bottom of the shin protection is denoted as Point Y on Figure 2.
The centre of the circular template for the ankle (zone 2) shall be positioned coincident with Point X and this shall be marked on the footwear. The template for the shin (zone 3) shall be positioned as in Figure 2 with the centreline coincident with the midline of the footwear and Point V marking the lower edge of the shin protection. This template shall also be marked on the footwear and a check shall also be made that point V is located within the tolerance permitted by dimension G.
6.2.5 Procedure
Test specimens shall be prepared by cutting away the sole of the footwear and opening the footwear by cutting up the posterior midline. The closures of the footwear on the front or side aspect shall be set as they were for marking the vertical and line on the front of the shin. Impact tests on the zones of protection on the anterior of the ankle and the shin are carried out on these samples.
Impacts shall be macic at the appropriate ener’ level, see Table 8, on the shin zone of protection on each pair from three sizes of footwear so that each pair of footwear is subject to 2 impacts (i.e. 6 impacts in total across the three sizes). The centres of impact shall be not less than 30 mm apart or less than 10 mm from the edge of the zone of protection marked on the specimen. Impacts should be made at different points within the zone of protection including any perceived areas of weakness so that the mean value is representative of overall performance. The peak transmitted force value for each impact shall be recorded and the mean value of the six peak transmitted force values for each of the three sizes shall be calculated.EN 13634-2017 pdf download.
EN 13634-2017 pdf download
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