SAFETY BELT
The present invention relates to safety belts. Some embodiment of the present
invention are in the area of safety harnesses, particularly safety harnesses for use in
life-saving activity. In particular, although not exclusively, embodiments of the
invention relate to safety harnesses for use in life-saving activity in water based
situations.
BACKGROUND
Typically, a life-saver’s safety harness comprises one or more buoyant members,
generally constituted from either a naturally buoyant, foamed material or made
buoyant through inflation. These buoyant members are often integrally formed into
some kind of vest or jacket to be worn by the life-saver.
In addition to the buoyancy of the safety harness, there is generally also provided a
webbing structure around the outside of the buoyant material, said webbing being in
place to perform multiple functions. Other, peripheral life saving devices (mirrors,
whistles etc...) may be attached to the webbing, meaning they are presented in a
convenient position for use in what is invariably a highly stressful situation. The
webbing also generally introduces structure to the buoyant portions, in as much as
different buoyant portions are often joined via the webbing, such that in certain
instances, rather than a single jacket/vest it would be more accurate to describe a
set of webbing with buoyant portions attached thereto. Obviously, the preceding
describes the two extremes and it is arguably more common for life-savers’ safety
harnesses to fall somewhere in the middle.
The final function regularly performed by the webbing is to provide an anchor point
for a life-line or safety lanyard. Typically, one end of a lanyard will be attached to a
base point (belayed by a rescuer or secured to a point on the bank etc...) with the
opposite end being attached to a releasably attached portion of the webbing, the
releasable attachment being such that the wearer can release it with a minimal effort,
thereby leaving the wearer with their buoyancy aid, but no longer being attached to
the base point.
US 4,973,277 (KHANAMIRIAN) discloses a ‘Safety Belt Harness System’ of the type
previously mentioned, incorporating a release mechanism to allow detachment of the
safety line, which will be described below. The basic life saving jacket comprises an
open fronted vest design, constructed with a plurality of buoyant panels (a foamed
material in this instance). The life-saving jacket is secured on the wearer via a
frontal zipper, with an additional, thin securing strap to restrain the front of the vest in
the event of zipper failure.
The jacket is further provided with a “safety belt harness system”. The safety belt of
the safety belt harness system is threaded through loops on the life vest and is
secured to the vest with a quick release, cam-type buckle. Removably attached to
the back of the vest is a metal D-ring. The safety harness is threaded through the D-
ring. A rope acting as a life-line may be attached to the D-ring.
The rope connected to the D-ring of the life vest will be tensioned, for instance, when
entering the water during a rescue attempt. If the person wearing the life vest with
the D-ring should get into trouble and need to immediately be detached from the
rope to which they are connected, the person can unbuckle the cam-type buckle of
the safety strap which, due to the tensioning of the rope connected to the D-ring, will
pull the D-ring away from its VELCRO (RTM)-type connection on the rear of the vest.
Since the safety belt has become unbuckled, the free end of the belt will unthread
out of the D-ring and the D-ring will be pulled away from the vest leaving only the D-
ring attached to the loose end of the rope. Unwanted release of the D-ring from the
vest is prevented by the secure fastening of the safety belt by the cam-type buckle.
Whilst the exact mechanisms employed to provide a quick/emergency release do
vary between life saving jackets, all are based on the concept of the securing
rope/safety lanyard remaining under tension during operation, a situation which
cannot be guaranteed in a real-life rescue situation in fast flowing water, let alone
when the water in not flowing and thereby offers no assistance in maintaining tension
in the safety line.
Recent tests of this type of life jacket have revealed some worrying issues with the
release of the jacket from the safety lanyard, particularly in situations where the
water from which a victim is being rescued is not fast flowing. The cause of these
problems is that in static/standing water it is particularly challenging to maintain
tension in the safety lanyard whilst allowing the rescuer enough freedom of
movement to perform his rescue function. The rope in these situations must not be
tensioned at all; this prevents the release from working effectively. Tests have
demonstrated failure rates in excess of 25% when attempting release in slow flowing
or standing water, clearly a situation which can threaten the lives not only of people
trapped in a flood situation (or otherwise requiring a water rescue), but also of the
rescuers themselves.
A number of other prior art life jackets are variously described in US 5,326,297
(LOUGHLIN); US 5,429,539 (GLASA); US D260,162; US 4,721,487 (COCHRAN);
US 5,452,487 (LEGGETT) and US 5,230,645 (CHENG). All, however, suffer from
the same shortcomings as those discussed above.
It has been discovered that the reason for the majority of release failures in standing
or slow flowing water situations is due to a lack of tension in the safety line/lanyard
and jamming of excess tape in the release mechanism. Traditional means of
maintaining tension in the lanyard have proved to be unsuccessful and the problems
associated therewith tend to become more exacerbated the greater the length of
lanyard and tape in the system.
It is an object of the present invention to provide a safety harness arrangement,
which, while functioning properly in high-tension environments has a reduced risk of
low-tension release failure, and/or to at least provide the public with a useful choice.
SUMMARY OF THE INVENTION
A first aspect of the present invention provides a belt, comprising: an inelastic portion
and a resiliently extendable portion for exerting tension on a first end of the belt; a
releasable fastening means attached to the first end of the belt and having a release
mechanism for releasably retaining a second end of the belt when the belt is around
a user; wherein the resiliently extendable portion is proximal to the releasable
fastening means such that, when the releasable fastening means is operated by a
user to release the second end, the tension provided by the resiliently extendable
portion pulls the releasable fastening means free from the second end.
A second aspect of the present invention provides a harness comprising securing
means for securing said harness about the person of a user; a belt according to the
first aspect.
A third aspect of the present invention provides a life jacket comprising one or more
buoyant sections and one or more fasteners for securing the life jacket around a
torso of a user, the life jacket further comprising a belt according to the first aspect
releasably attached to said life jacket for attaching the life jacket to a lanyard.
Preferably, said resiliently extendable portion comprises an elasticated material, and
may have a maximum extension. The inelastic portion may comprise a non-
extendable element in communication with said resiliently extendable portion to limit
said maximum extension.
In a preferred embodiment, said belt further comprises two discrete belt portions.
Preferably wherein said first and second portions are connected at a first end via a
secure buckle attachment and at a second end via said release mechanism.
In a further preferred embodiment of the present invention said first belt portion
comprises said one or more tensioning elements and said release mechanism. Said
second portion of said safety belt may substantially longer than said first portion and
said release mechanism preferably comprises a quick release buckle.
Preferably said integral harness further comprises one or more body sections,
wherein said one or more body sections may be buoyant body sections.
According to aspects of the present invention there is provided an apparatus as set
forth in the appended claims.
The term “comprising” as used in this specification and claims means “consisting at
least in part of”. When interpreting statements in this specification and claims which
include the term “comprising”, other features besides the features prefaced by this
term in each statement can also be present. Related terms such as “comprise” and
“comprised” are to be interpreted in a similar manner.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described by way of example only, with
reference to the accompanying figures, in which:
Figure 1 shows a front view of a low tension safety harness according to an
embodiment of the present invention.
Figure 2 shows a two part safety belt, according to an embodiment of the present
invention, in its assembled state.
Figure 3 shows a two part safety belt, according to an embodiment of the present
invention, in its disassembled state.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
For the purpose of clarity, the following terms should be taken to have the respective
meanings outlined below:
An “integral harness” should be taken to mean any form of harness system with an
integral safety belt system.
The term “body section” should be read in its broadest context such that a panel of a
coat, a strap, a buoyancy aid, etc... should all be taken to be referred to by the use of
the term.
An embodiment of the present invention is shown in Figure 1. A safety harness
according to the present invention includes a life jacket 1. Although the present
invention is described with reference to a life jacket 1, it will be realised that
embodiments of the invention may be envisaged which do not include a life jacket.
The life jacket 1 comprises one or more buoyant sections 2, a securing means in the
form of buckles 3 for securing said buoyant sections 2 about the body (torso) of the
user. The life jacket 1 may be formed into a sleeveless jacket shape as shown in
figure 1.The securing means 3 may alternatively take the form of a zipper or similar;
if the body section(s) 2 are formed such that the device is pulled over the head of the
user, said securing means could take the form of ties, cords etc., suffice to say, the
form of said securing means is, at least in part, defined/dictated by the form chosen
for the body section(s) 2.
The safety harness further comprises safety belt 4 according to an embodiment of
the invention which is shown in Figures 2 and 3 in greater detail. The safety belt 4
includes a dorsally positioned ring 10 for attaching the safety belt to a lanyard. The
safety belt may be releaseably attached to the life jacket 1 via a complimentary pair
of Velcro (RTM) pads (not shown) on an inward-facing surface of the safety belt for
attaching to corresponding pads on the life jacket 1. The safety belt 4 is attached to
the life jacket 1 to prevent unwanted movement of the belt 4 about the life jacket in
use, but the fastening means should require only a minimal force to separate the belt
4 from the life jacket 1 when desired by the user i.e. when the safety belt 4 is
released by the user.
The safety belt 4 includes a release mechanism comprising a quick release buckle 5
which is activatable by a user. The buckle 5 fastens the safety belt 4 around the
user in a fastened position and may be activated by the user to release the user from
the safety belt 4 by decoupling first and second ends of the safety belt 4 in an open
position. The release buckle 5 may have a toggle for grasping by the user to cause
the buckle 5 to move from the fastened position to the open position, thereby
releasing the first and second ends of the safety belt 4. If the safety belt 4 has
sufficient tension applied via the lanyard, the belt 4 is easily pulled from around the
user when the buckle is in the open position. However, as will be explained,
embodiments of the invention are useful in low-tension environments where
relatively low tension is applied via the lanyard.
The safety belt 4 comprises a first portion 6 and a second portion 7, said first and
second portions 6, 7 preferably being connected at a first end via a secure buckle 9,
although it will be realised that the first and second portions 6,7 may be connected at
the first end in other ways, such as by stitching. The secure buckle 9 is a figure of 8
buckle through which ends of the first and second portions 6,7 may be threaded to
securely but adjustably engage together. The first and second portions 6, 7 are
connectable at a second end by the quick release buckle 5. The first portion 6 may
be securely attached to said release buckle 5 via a second secure buckle 11,
although, again, it will be realised that the first portion 6 may be connected to the
quick release buckle 5 in other ways, such as by stitching. The secure buckle 11
attaches a loose end of the first portion 6 to itself at an intermediate point to form a
looped end-section of the first portion 6 which retains the quick release buckle 5. The
said second portion 7 is releasably attached to said release buckle 5 via the buckle’s
release mechanism, such as by a cam system of the quick release buckle 5 which
grasps the second portion, such as via internal teeth.
The use of a two part safety belt 4 allows the wearer to adjust the girth of the belt, as
shown in Figure 3, whilst ensuring that only a small section of said second portion 7
of said safety belt has to pass through said release mechanism 5, thereby reducing
the likelihood of jamming occurring at this point and consequently reducing the risk
of the system as a whole failing upon activation. The girth of the belt 4 may be
adjusted at the secure buckle 9, as shown.
Said first portion 6 of said safety belt 4 further comprises a resiliently extendable
section 8 in order to pre-tension said safety belt 4. The resiliently extendable section
8 may be formed from an elastic material, such as an elasticised fabric, or may
include a spring mechanism or the like. It will be realised that the absolute form of
said resiliently extendable section may be chosen suitable for the application of the
belt 4. The resiliently extendable section 8 exerts tension to have an effect of
tensioning the portion of the belt 4 proximal to the quick release buckle 5, regardless
of the degree of tension in the belt 4 as a whole i.e. introduced via the lanyard.
Advantageously, failure of the release mechanism discussed with reference to the
prior art life jackets is reduced or substantially obviated.
The resiliently extendable section 8 may be partially constrained, such that the
maximum degree of extension available is limited, not by the elastic properties of the
resiliently extendable section 8 itself, but is controlled via additional extension control
means. Said extension control means may be as formed by attaching two points of
the safety belt 4 together with an inelastic material, such that the elastic material, in
its relaxed state, is of shorter length than the distance between said attachment
points on said safety belt 4, whilst the maximum extension of said elastic material is
greater than said distance, such that under no tension, the effective length of the
relevant section of safety belt is determined by the relaxed length of said elastic
material, whereas under maximum tension, the effective length of the relevant
section is the actual length of said section of safety belt, which is less than the
maximum extended length of said elastic material.
In order to operate the release mechanism 5, the wearer of the safety belt activates
the quick release buckle 5; the end of said second portion 7 of said safety belt 4 is
thereby freed from said quick release buckle 5. The resiliently extendable section 8
of said first portion 6 of said safety belt 4, currently under tension, then contracts to
its shorter, untensioned length, pulling said quick release buckle 5 free from said end
of said second portion of said safety belt 4. Subsequently, said safety belt 4 is then
pulled free from said safety harness through a combination of movement of the
wearer and the latent/inherent tension in the lanyard to which it is attached.
Embodiments of the invention may be specifically of advantage when the flow rate of
water around the user is such that tension from the life-line/safety lanyard attached
to the harness cannot be guaranteed.
It should be noted that whilst the bulk of the description following is based around a
buoyant, life saving safety harness, the same technological development to the
harness is much more widely applicable, with potential application in fields as
diverse as rucksack manufacture, mountaineering equipment, parachute harnesses
and a host more. Hence the description herein should not be taken to be limiting the
scope of the present invention purely to safety harnesses used within waterborne life
saving activities.
All of the features disclosed in this specification (including any accompanying claims,
abstract and drawings), and/or all of the steps of any method or process so
disclosed, may be combined in any combination, except combinations where at least
some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims,
abstract and drawings), may be replaced by alternative features serving the same,
equivalent or similar purpose, unless expressly stated otherwise. Thus, unless
expressly stated otherwise, each feature disclosed is one example only of a generic
series of equivalent or similar features.
The invention is not restricted to the details of any foregoing embodiments. The
invention extends to any novel one, or any novel combination, of the features
disclosed in this specification (including any accompanying claims, abstract and
drawings), or to any novel one, or any novel combination, of the steps of any method
or process so disclosed. The claims should not be construed to cover merely the
foregoing embodiments, but also any embodiments which fall within the scope of the
claims.