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Issue date: 17 November 2006
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3
Backplate assembly
General
3.1
The height adjustable, and articulating backplate assembly, provides the wearer maximum
comfort and ease of use, resulting in reduced wearer fatigue. The backplate assembly consists of
three elements:
1.
The adjustable shoulder yoke.
2.
The backplate.
3.
The waist belt pivot slide assembly.
3.2
Each of the elements is manufactured from a moulded
carbon composite material, providing an anti-static,
lightweight and durable system.
3.3
The adjustable shoulder yoke has two guide arms that
locate, and slide, in the two channel slots in the rear of
the backplate.
3.4
At the base of the backplate is the waist pivot slide
assembly. This unit is assembled to a spring loaded
vertical slide that is guided in a vertical slot in the
backplate.
3.5
Two compression springs, in the slide assembly, act against the slide and pivot slide assembly to
hold the unit at the top of the slide.
3.6
When wearing the BA set, the waist pivot slide assembly slides, and pivots, in response to the
twisting and bending movements of the upper body of the wearer. This flexibility improves the
weight distribution, and provides freedom of movement and increased manoeuvrability for the
wearer.
3.7
For maximum comfort and improved weight distribution adjust the
shoulder straps to allow the BA set waist belt to be positioned
comfortably on the hips so that weight is taken through legs.
3.8
A twin hook arrangement, moulded at the base of the SDBA backplate,
provides a positive mounting for the body of the pressure reducer.
3.9
Located in the recess behind the twin hook is a pre-loaded coiled return
spring. The spring latches onto an extended portion (lug) on the body
of the pressure reducer, securing the reducer assembly in its twin hook
location.
3.10
A degree of pivotal movement of the reducer is possible to allow for the
alignment of the hand wheel of the reducer to the cylinder valve.
3.11
The EDBA reducer is not mounted to the backplate.
3.12
A rubber shock buffer, at the base of the backplate, provides additional
impact protection.
3.13
Side handles, incorporated into the backplate moulding, allow for the
BA set to be easily carried (without cylinder attached).
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