BS EN ISO 19953:2004 – Footwear — Test methods for heels — Resistance to lateral impact
1 Scope
This European Standard specifies a test method for determining the impact strength of the heels of ladies’ shoes. The result provides an assessment of the liability to failure under the occasional heavy blows received during wear.
NOTE While the test method is applicable to all types of high heels, of whatever construction, it is particularly useful for injection-moulded plastics heels which incorporate a steel dowel reinforcement, giving information on the suitability of the dowels’ hardness or softness. Normally, heels which by virtue of their shape have a high lateral impact resistance do not need to be tested in this way.
2 Apparatus and material
2.1 General
The following apparatus and material shall be used.
2.2 Lateral impact tester
2.2.1 General
An example of a suitable apparatus is being shown in Figure 1. The apparatus is clamped either onto a solid built-in bench, or onto a rigid free-standing frame anchored to the floor.
The lateral impact tester shall include the following.
2.2.2 Pendulum, consisting of a circular steel bob of diameter (108 ± 1) mm and thickness (49 ± 2) mm, which is fixed by a circular steel shaft of diameter (25 ± 0,5) mm to a hub, on the bearing axle of diameter (75 ± 1) mm.
The distance from the centre of the bob to the centre of the hub is (432 ± 2) mm. The moment of the pendulum when it is held horizontally is (17,3 ± 0,2) N⋅m.
2.2.3 Striker head, consisting of a strip of metal (6,0 ± 0,5) mm thick, (25,0 ± 0,5) mm wide and (35 ± 2) mm long with the striking edge rounded to a radius of (3,0 ± 0,5) mm. The head is fixed rigidly to the pendulum bob so that the striker tip and centre of the bob lie on the same circle of swing of the pendulum and are (89 ± 2) mm apart.
2.2.4 Energy scale for the pendulum, calibrated in increment of 0,68 J, from 0 J to 18,3 J. A marker attached to the pendulum moves over this scale and enables the pendulum to be set up to the desired energy of blow.
2.2.5 Base clamp, for holding the metal mounting tray (3.2) and for adjusting it vertically and horizontally to achieve correct allignment of the heel tip.
NOTE If the apparatus is not firmly mounted there is partial loss of energy on impact, thereby producing false results.
BS EN ISO 19953:2004 – Footwear — Test methods for heels — Resistance to lateral impact