Takata Racing RACE 4 SNAP - Manual (Page 3)

5 6
Shoulder belt mountings, located more than 200 mm [8”] from the back of the
user’s seat or angled upwards, are not good practice and are most strongly
discouraged. If shoulder belt anchor points are further back in the vehicle, the
belts should be closer together at their mounting points, even crossing
depending on the distance of the anchor points, but both belt and Head And
Neck Support performance are severely compromised. See Table Below
Shoulder belts shall cross over when the anchor points are located more
than approx. 500 mm [20”] behind the seat backrest.
For 75 mm [3”] webbing wrap around installation the following approx. anchor
point distances are suitable:
Reduce numbers by 25mm [1”] if a Head And Neck Support specific harness is
to be installed.
In metric measure
Distance from seat in mm 200 300 400 500 600 700 800
Anchor point distance in mm
150 100 75 75 -75 -100 -150
In imperial measure
Distance from seat in inch 8 12 16 20 24 28 32
Anchor point distance in inch 6 4 3 3 -3 -4 -5
side
by side
side by
side
crossed
over
crossed
over
crossed
over
F OR 75 MM [3”] WEBBING BOLT ON INSTALLATION
Reduce numbers by 25mm [1”] if a Head And Neck Support specific harness is
to be installed.
In metric measure
Distance from seat in mm 200 300 400 500 600 700 800
Anchor point distance in mm
150 100 50 0 -50 -100 -150
In imperial measure
Distance from seat in inch 8 12 16 20 24 28 32
Anchor point distance in inch 6 4 2 0 -2 -4 -6
Single
point
crossed
over
crossed
over
crossed
over
A N T I - S U B S T R A P R O U T I N G
6- POINT M ODELS WHERE A NTI -S UB S TRAPS ARE CONNECTED TO THE
BUCKLE
Anti-submarining strap routing shall be vertical down from the groin, and
preferably approximately 20° back,
Anchor points shall be approximately 100 mm [4”] lateral apart from each other.
In case of a low seating position (e.g. in open wheel race cars), this separation
may be reduced since the anchor points are closer to the thighs.
F ORMULA M ODELS
This anti-sub strap design requires sitting on the straps or having a thin seat
panel allowing the straps running rearwards right underneath the driver’s buttock
and attaching in the region near or on the lap belt anchorages.
The anti-submarining strap routing over the upper thighs and attachment to the
shoulder belt latches with the buckle in between, does not provide a direct load
path from the shoulder belts down to the anti-submarining strap anchor points.
The indirect routing requires a type of preloading of the anti-submarining straps
during a frontal impact. This is achieved by sitting on the anti-submarining straps,
routing them rearwards and attaching them in the region near or on the lap belt
anchorages.
Important: This anti-sub strap design requires sitting on the straps or having a
thin seat panel allowing the straps running rearwards right underneath the
driver’s buttock.
N E G ATI VE G B E LT (7 T H P O INT )
Used in conjunction with a 6-point formula crotch belt system as an additional
point to maintain the position of the lap belt in “Negative G” i.e. rollovers