Gentex SPH-4B - Earcups; Retention Assembly

Earcups (Figure 4)
Lightweight energy-
absorbing earcups
provide lateral impact
protection and sound
attenuation. The earcups
are contoured to
enhance the fit to the
ear, and can be rotated
within the retention
assembly to further
improve the fit. Earcup
spacer pads may be
placed between the
earcup and the inside of
the helmet shell to
increase earseal
compression, if
necessary.
Retention Assembly
(Figure 5)
The yoke-style retention
assembly is designed to
minimize forward rotation
of the helmet and reduce
chinstrap stretch during
use, thus providing a
higher level of protection.
The chinstrap employs a
double “D” ring design for
ease of tightening and
loosening. The retention
assembly has an
adjustable rear nape
strap system
incorporating a
rear-closure
hook-and-pile fastener
for individual sizing and
an adjustment strap and
buckle to ensure a snug
fit. A hanger tab at the
rear helps hold the
retention assembly in
place and provides for
up-and-down adjustment
via two eyelets.
3
Figure 4. Earcups
Figure 5. Retention Assembly
EARSEAL
RECEIVER
RETAINER
FILLER
PAD
EARCUP
SPACER
PADS
SPACER
PADS
EARCUP
FILLER
PAD
RECEIVER
RETAINER
EARSEAL
REAR
HANGER
TAB
REAR
NAPE
STRAP
REAR HOOK-
AND-PILE
CLOSURE
DOUBLE
D-RING
RETENTION
ASSEMBLY
CHINSTRAP