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Design Requirements |
Primary Design
Feature |
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Triple5 –
Primary Design Feature:
Load Over
Center is the central design feature of the hook
that enables the achievement of the primary design
requirements. Load Over Center is defined as the
load point of the hook being directly above the
center of the pivot point of the hook. Such a design
ensures that the weight of the boat keeps the hook
closed when it is in the air.
A Load Over Center design is shown in the two
diagrams on the left below. The first shows SSI’s
single cable hook and the second shows the Triple5
hook derived from that design. The diagram right
below shows a conventional unstable twin-fall hook
that does not have a Load Over Center design and
uses the weight of the boat to open the hook.
SSI SINGLE
CABLE INHERENTLY
STABLE HOOK
LOAD OVER PIVOT CENTER
NO ROTATIONAL FORCE |
UNSTABLE HOOK
LOAD NOT OVER PIVOT CENTER
ROTATIONAL FORCE
(Opens the Hook) |
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TRIPLE5 INHERENTLY
STABLE HOOK
LOAD OVER PIVOT CENTER
NO ROTATIONAL FORCE |
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The Triple5 hook has the same Load
Over Center characteristics as the SSI single cable
hook.
In addition the Triple5 hook has the identical hook
profile (left side) of the SSI single cable hook.
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No Hydrostatic Valve Required: A
hydrostatic valve is used in conventional
twin-fall hook designs in an attempt to
prevent premature hook release, and is
required due to the unstable design. As the
Triple5 hook is a stable Load Over Center
design, a hydrostatic valve is not required.
No Locking Pin Required: The stable
Load Over Center design will not allow
premature release of the lifeboat using the
same release handle as used for regular
waterborne operation. This is not the case
with other hook designs. As such other hook
designs require added levels of security
(such as a locking pin).
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