CAT NO: DIDACTICNLE-Export-106001
Retention Tester -is apparatus for dynamic test of retention system and retention test.
retention system of helmets is subjected to a specified dynamic loading
to determine its dynamic displacement, residual displacement, and
damage to the retention system in order to assess the suitability of the
helmet. It is further subjected to a dynamic loading at a tangential
line on the rear part of the shell. After the test the inclination of
helmet on the head-form is checked for suitability of its retention
The Apparatus for Dynamic Test of
Retention System and Retention Test of helmets consists of a rigid
fabricated steel frame fitted with arrangements to carry out either of
the two tests.
The arrangement for dynamic test of
retention system consists of a stand to hold the helmet by its shell
from a hook connected to a screw to raise or lower it. The helmet is
mounted over a head-form with initial loading device cum guiding system.
A mass of specified weight is allowed to fall on the anvil of the
loading device from a specified height. The mass is lifted with the help
of a handle and chain arrangement and is held by a catch at the
specified height. For dropping the mass, the catch is released and mass
drops guided on a rod. The displacement of retention system is measured
on a vertical scale.
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