Protective clothing for use in Snowboarding
BS EN ISO 20320:2020 pdf free.Protective clothing for use in Snowboarding一Wrist Protectors一Requirements and test methods.
An assessor of suitable hand size shall put on, tighten and take off both wrist protectors (left and right) by themselves (without external support) as specified in the information supplied by the manufacturer, including gloves for wrist protectors, provided to be worn with gloves.
An assessor shall fix and then unfix themselves to a snowboard by closing and then opening the binding of the snowboard (left and right) while wearing wrist protectors and gloves on both hands (right and left).
The wrist protector shall be put on by an assessor with the appropriate hand sizing (see ThbkJ) in the way specified in the information supplied by the manufacturer.
Standalone protection concept to be worn over the glove shall be tested with the type of gloves specified in the information supplied by the manufacturer.
Fasten the wrist protector as specified in the information supplied by the manufacturer. A reference line square to the long axis of the fingers, which best represents the mean approach to the positions of the marks showing the joint position [Line 2 of Figure 2 a)] shall be drawn onto the upper surface of the wrist protector. A mark shall be drawn onto the skin of the forearm within 1 cm from the end of the wrist protector [Line 1 of Eigur2 a)].The assessor shall flex the wrist in palmar and dorsal directions 10 times to the full range of motion.
The assessor shall sit or stand with the trunk in a vertical position, the rear side of the upper arm pressed against a vertical support or wall and the forearm with the protector or protector and glove to be tested oriented approximately horizontal. The hand and finger joints shall be maintained in a stretched position during the test.
The distance between the reference line and the mark on the forearm shall be measured [Distance I of Figure 2 a)I.
The force shall be applied at a rate of <200 mm/s in a direction parallel to the (longitudinal) axis of the forearm, by using a spring balance or similar device with a measuring range of at least 30 N. Forces shall be attached to the inner and to the outer side of the protector Lmedio-lateral direction, see Figure 2 b)]. Apply the force of (15 ± 1,5) N and maintain for (10 ± 1) s in a direction parallel to the forearm axis. Then release the forces. Measure the distance between the reference line (line 1) and line 2 with an accuracy of± 2 mm within 5 seconds after release of the applied force IDistance 12 see Figure 2 c)1.
Three tests shall be made using the same sample. Reposition and adjust the wrist protector as necessary between the tests.
Impact strength shall be tested in impacts with a mass of (5 000 ± 25) g. The apparatus shall consist of the following:
a) pendulum test rig or a free fall guided-mass test rig.
b) steel anvil shall have a flat surface that is larger than the protector.
c) striking face on the impact mass that is circular with a diameter of (80 ± 2) mm. The corner of the striking face with its vertical side shall have a radius of curvature 01(0.5 ± 0,1) mm. The striker and the impact mass shall be made of steel.
The apparatus shall be adjusted so that the impact energy is in accordance with TableA.
Templates shall be centred on the points marked on the wrist protectors as follows.
On a person of an appropriate size for the protector, establish the position of the plane of their wrist joint according to ISO 13999-1:1999, Figure 1.
Draw a transverse line on their palm 30 mm, 40 mm or 50 mm from this plane for ranges A, B or C wrist protectors respectively.
Draw a longitudinal line down the centre of their palm. Fit the protector with the palm protection element to the person according to the information supplied by the manufacturer.
Place the template on the palm protection element so that its centre lies above the intersection of the two lines. Draw a line on the protector around the template.
Testing shall be carried out in an apparatus in which a guided mass falls onto a test specimen on an anvil. The centre of gravity of the falling mass shall be above the centre of the anvil.
The falling mass shall have a mass of (2,5 ± 0.025) kg and a striking face of 40 mm ± 2 mm x 40 mm ± 2 mm. It shall be made of polished steel, edges rounded with radius 1 mm ± 0,5 mm.
A means of measuring the velocity of the falling mass 5 mm to 15 mm before impact shall be provided to enable the impact energy to be verified.
The anvil shall be made of steel and shall have a radius of 100 mm and a hemispherical surface with a radius of curvature of 100 mm.
The anvil shall be attached through a piezoelectric load cell to a mass of at least 1 000 kg. The load cell shall be preloaded in accordance with the information supplied by the manufacturer.
The anvil shall be so mounted that during the impact test the total force between the anvil and the solid base of the device is conducted through the sensitive axis of a load cell. The recording system shall show a continuous force with time or shall have a peak force detection capability, Digital sampling systems shall have a minimum rate of 10 kHz.
The protector shall be placed on the anvil and held down with a force between 5 N to 10 N. NOTE A system of elastic straps has been found suitable.
The protector shall be moved on the anvil so that each chosen test position is impacted. Test positions shall be at least 15 mm apart. Test positions shall include points within the marked test area that it is anticipated will be particularly weak.
Four impacts shall be made with at least 30 s between each impact.
5.8 Limitation of wrist extension
Wrist protectors shall be fitted to appropriate sizes of wrist and hand prosthesis. A specific torque (Torque I of Table 8) initiated into the wrist by applying a force perpendicular to the fingers and the angle of the wrist of the prosthesis is measured (Extension I of Figure 1). A second higher torque is applied and the angle of the wrist of the prosthesis is measured again (Extension 2 of Figure 1).
The hand, wrist and joint dimensions for a right hand prosthesis are given in Fjgure..a and Thbk7. Hand and wrist parts shall be made of polyamide or similar material. The hand shall be connected to the wrist using a metal bolt or screw tightened to hold the hand in place without resisting flexion and extension. The two rods extending from the hand intended for the load application shall be made from steel. The mass of the complete hand of the prostheses shall not exceed 0,600 kg. For the test, the forearm shall be fixed in a vertical position.
The force shall be applied via a cable (e.g. gear changing cable for bicycles) or a cord (e.g. string) around the fingers according to Figure 3. No other additional mass shall be applied to the fingers such as a clamp to hold the cable or cord. When testing integrated protection designs or wrist protectors designated to be worn over gloves, the load application shall be mounted over the glove fingers 3 and 4 (see ISO 13999-1:1999, Figure 1.). The direction of the force shall be 900 to the fingers (Figures 1 and 3).BS EN ISO 20320 pdf free download.Protective clothing for use in Snowboarding