CA2993338C

CA2993338C - Dry suit

Info

Publication number: CA2993338C
Application number: CA2993338A
Authority: CA
Inventors: Patrick G. BEYELER
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-07-23
Filing date: 2016-07-12
Publication date: 2021-08-24
Anticipated expiration: 2036-07-12
Also published as: CH711348A2; JP6871906B2; PL3324768T3; CN108348016A; CN108348016B; ZA201800413B; BR112018001330A2; CH711348B1; EP3324768A1; DK3324768T3; EA201800003A1; WO2017012910A1; BR112018001330B1; US20180222559A1; JP2018523023A; IL256700B; CA2993338A1; EA034450B1; IL256700A; UA123151C2

Abstract

The dry suit is produced preferably as a one-piece combined suit made of a three-layer, water-tight but air-permeable, woven laminate with maximum 220 g/m2 mass per unit area, and also seamlessly includes the feet. A water-tight zipper (4) extends from the crotch area up to the top edge of the collar (5). There is a water-tight zipper (4) on each of the sleeves (8), which extends rearwards from the front edge of the cuff (13) along the lower arm. With said watertight zipper (4, 7) the collar and chest region as well as the sleeves (13) and front arms (8) can open to a certain extent, providing an effective cooling function, which makes the wearing of the dry suit in non-critical mission phases significantly more comfortable and less tiring. In addition, said dry suit has a total weight of less than 1.5 kg and is correspondingly light to wear on the body.

Description

DRY SUIT
(0001] This invention relates to a comfortable, light and breathable dry suit for keeping persons having fallen into the water dry to delay their life-menacing hypothermia. Among experts one speaks of Immersion Protection Suits (IPS).

[0002] An immersion suit or survival suit, is a special kind of waterproof dry suit. It is intended to protect people who have fallen into cold water as a result of an accident, usually after a sinking or capsized ship has been abandoned, or in the military sector after a crash into the water or an emergency landing of an aircraft on water.
Such a dry suit should maintain the body heat within the suit and keep the user dry until he or she is rescued from the cold water. These dry suits are tailored to the wearer's body and must be worn by a crew as a precautionary measure if there is the danger of falling into the water during a mission. It is therefore important that these suits are as light as possible, as well as quickly and easily put on and comfortable to wear. It is known that a person's chance of survival when he or she has fallen into the water can be significantly increased essentially by staying dry and maintaining the body temperature, because then a hypothermia can be postponed.

[0003] Conventional dry suits are usually made of reinforced neoprene and have a face seal and flap, finger gloves, waterproof zip fasteners, ankle cuffs, neoprene pockets and reflective stripes, and they are to limit the wearer's freedom of movement as little as possible. They must comply with the provisions of the International Convention for the Safety of Life at Sea (SOLAS) as to hypothermia, and their use is intended primarily for personnel on board military aircraft, military ships or military boats, ferries, offshore drilling rigs, lifeboats, fast-rescue boats and for general commercial use.

[0004] The challenges in constructing a dry suit are the various conflicts of aims.
The suit should provide optimum protection against heat loss and wetness.
However, the better it fulfils these characteristics, the more uncomfortable it is to wear, as long as its actual function does not matter. Because of the waterproofness, for example when using neoprene, sweating or breathing of the body's skin is impossible.
Correspondingly, the heat accumulates in the body, which is very unpleasant.
The better the thermal insulation, the less comfortable the suit is to wear. Many dry suits with thick layers of thermal insulation materials are so stiff and cumbersome that they can hardly be put on by the users themselves. They need helpers to put on the suit. If, for example in the case of aircraft crews, a dry suit has to be worn during the preparation phase or briefing for a flight as well as during debriefing, this is usually very uncomfortable for those affected. In the usual suits one sweats, although in principle one can't sweat effectively for the heat dissipation. As soon as one has put on a conventional dry suit, the neck and wrists are sealed waterproof in this suit and any air exchange between the inside and outside, and thus with the body surface, is prevented.
This leads to the fact that very soon one has a moist or wet body surface and has to suffer from a heat accumulation. Wearing such a dry suit is therefore very unpleasant in the long run and considerably impairs well-being and performance, a fact every naval pilot will immediately confirm.

[0005] The object of this invention is therefore to create a dry suit which, in addition to the function of keeping the wearer dry in water and insulating the heat in accordance with the existing regulations is now considerably lighter and much easier to put on and much more comfortable to wear. Furthermore, the dry suit should be capable of being worn in combination with an acceleration protection suit as one is indicated in W02012/066114 Al, and it should in any case be capable of being put on and taken off by the user without assistance, and have passive or optionally active cooling functions for the phases of non-functional use.

[0006] This object is solved by a dry suit for keeping people having fallen into the water dry by delaying their life-threatening hypothermia, characterized in that it has at least one waterproof zip fastener for putting on and taking off said dry suit, wherein a waterproof zip fastener divides the collar for opening, and that at each of the sleeves a waterproof zip fastener extends along the forearm for opening the waterproof cuffs so that the entire suit can be worn open at collars and cuffs during non-critical mission phases and thus allows an air exchange with the surface of the body, and that it can quickly be brought from this state to a waterproof state by closing all waterproof zip fasteners.

[0007]
In the figures, this suit is pictured in two versions and described hereafter, and its function explained.

[0008] There are shown:
Figure 1 The dry suit is designed as a one-piece combination suit, in donned state, as viewed from the front;
Figure 2 The dry suit is as a tow-piece suit, except for a textile material bridge, having jacket and trousers, in donned state, as viewed from the front.

[0009]
As can be seen in Figure 1, the suit in this example is designed as a combination suit 1, i.e. it forms a one-piece suit. As a special feature, this suit consists of a three-layer, flame-resistant, waterproof, breathable and incident flow-proof fabric laminate with a weight per unit area of merely 220 grams/m2. This fire-retardant fabric laminate consists of a tear- and flame-resistant fabric on the outside, followed by a glue layer, then a membrane with a microporous structure, for example based on polytetrafluoroethylene, with more than 10 million pores per mm2 so that this membrane is waterproof but vapor-permeable. Then comes another glue layer, followed by a fabric with aramid fibers (Kevlare), which is particularly light, about 40 gr./m2

10%, and serves as a protective layer for the inner membrane. Hence the fabric laminate can withstand a pressure column of up to 10 meters and is therefore highly watertight or waterproof as well as incident flow-resistant. By using this fabric laminate, a low overall weight of the entire dry suit of less than 1.5 kg is achieved, which has hardly been thought possible so far. This in turn significantly increases the wearing comfort of this dry suit. Experiments have shown that it adds so little bulkiness to the body that it can = CA 02993338 2018-01-22 even be worn under an ordinary street suit without the viewer noticing it. The fabric of the dry suit has to be incident flow-resistant in order that the dry suit can withstand very high incident-flow speeds of up to 600 knots (kn) or 1111 km/h, as these occur in the event of an ejector seat ejection and act on the pilot. This incident flow-resistance is achieved by the mentioned high tear resistance which is offered by the flame-retardant thin outer fabric.
[0010] To put on the dry suit, one slips one's legs and feet into the trouser joints 2, and this part hereafter wraps the legs and feet of the wearer already waterproof so that the wearer could stand knee-deep to hip-deep in water because the trouser joints 2 made of waterproof three-layer fabric seamlessly merge into foot bindings 3.
The suit is easy to put on because a waterproof zip fastener 4 extends from the area of the crotch to the top of collar 5. To put on the upper-body garment 6, one opens along with the front main zip fastener 4 also the two zip fasteners 7 on the cuffs 13 and front sleeves 8.
Hereafter one can slip on the upper-body garment 6 and in the process slip one's arms into the sleeves 8. The suit offers at least one waterproof zip fastener chest pocket 15, which can be closed with a waterproof zip fastener 14, as well as another waterproof zip fastener 18, which allows access inside the suit in the chest area. This is in particular necessary if the dry suit is worn over another suit, especially over an acceleration suit. It has been shown that in this case the function of the acceleration protection suit is not impaired by this dry suit being worn over it. Furthermore, the dry suit can optionally have a waterproof trouser pocket 10 which can likewise be closed with a waterproof zip fastener 9.

[0011] During preparation and intermediate times, when the suit does not have to be in standby mode, i.e. during uncritical mission phases, this dry suit can be left open at the top of collar 5 and at the front sleeves 8 by not tightening the zip fasteners 7 there completely, but by leaving a section somewhat open as desired, and by leaving the main zip fastener 4 of collar 5 somewhat open at will. Hence an effective passive cooling function is achieved, which is not possible with any other dry suit to date and is probably the most important advantage of this dry suit. Conventional dry suits, once they are put on, namely enclose the neck and wrists in a waterproof manner so that air exchange with the body is no longer possible, which proves to be extremely unpleasant as long as no emergency occurs, which is true for most of the time when such a dry suit is worn. The cooling function of the dry suit presented here by opening collar 5 and cuffs 13 and front sleeve 8, however, offers the user an enormous and highly welcome relief in practice. Due to its cooling function and its special lightness, wearing this dry suit proves to be far more comfortable than closed dry suits of conventional design.

[0012] The main zip fastener 4 is closed up to the upper collar edge only shortly before a standby phase. The collar 5 is equipped with an elastic rubber lip 11 at its upper edge, which attaches itself all-round waterproof to the neck of the wearer when the main zip fastener 4 is completely closed. The cuffs 13 are at the front end of the sleeves are executed similarly. They terminate with a rubber lip 12 which runs around the zip fastener. When the zip fasteners 7 on the front sleeves 8 are completely closed toward the front, these rubber lips 12 close behind the wrist around the forearms in a waterproof manner.

[0013] As Figure 2 shows, the dry suit can be produced in a variant as effectively a two-piece suit, with a jacket and trousers 17 attached to it by a textile material bridge.
The trousers and the jacket are connectable in a waterproof manner by a waterproof zip fastener 16, which runs around the hip overlapping somewhat. This design offers a further cooling function in the hip area, because when this zip fastener 16 is more or less opened, a very welcome cooling function is hence achieved in the area of the abdomen, hip and lower back. Especially in the area of the lower back one tends to sweat particularly heavily. Apart from that, this suit is constructed identically to the one corresponding to Figure 1, i.e. it also has at least one waterproof breast pocket 15, which can be closed with a waterproof zip fastener 14, and a waterproof zip fastener 18 in the chest area, for reaching into the dry suit from outside. Further, as shown, this suit has a waterproof trouser pocket 10 which can be closed with a waterproof zip fastener.

[0014] Hence this dry suit, as presented, is the only known protection suit against cold and water for aircraft crews which, in the context of flight preparations and flight post-processing and debriefings, can be worn with the collar open to the lower abdomen and with open cuffs 13 and front sleeves and nevertheless offers the wearer the necessary cold water-protection in an emergency by quickly closing the waterproof zip fasteners.

[0015] Furthermore, because this dry suit for the first time consists of a comparatively thin, three-layer fabric laminate, it weighs less than 1.5kg and is therefore so light and hardly bulky that it can be worn over an acceleration protection suit, and the function of this G-suit is not impaired if it is constructed according to the design as disclosed in W02012/066114. If it is furthermore combined with the features of a cooling suit, i.e. equipped with flat cooling channels on its inner side, which can be supplied for example at the hip area from a hose sleeve opening waterproof outwardly via a hose from a portable pressurized gas cylinder with expanded and thus cool gas, preferably with cool air, it also offers, in addition to protection from cold and moisture, an active, highly effective cooling system for the periods in which it is worn as a protective suit merely as a precaution. The gas and air ducts are then led to all highly perspiring body parts and have outlet openings to transport heat away from there. These points are located especially at the lower back, at the hips, in the hollows of the knees, at the neck and in the chest area, in the armpits, arm joints as well as at the front sleeves which face the inner sides of the wearer's forearms. The heat absorbed by this cooling gas or by the cooling air is then transported outward through the cuffs 13 kept open and the opened collar 5 as long as the dry suit is not used as such. Hence this offers a system which is even more comfortable and less heat-intensive for intercontinental flights, as well as for operations in the tropics and in the polar regions.

[0016] The pilot or other crew members do not need any help and can put on or take off the suit by themselves. The very light and at the same time extremely heavy-duty 3-layer fabric laminate was developed especially for this dry suit. This innovative fabric laminate leads to a weight reduction and at the same time to high strength and durability. In addition to the waterproofness and a certain air permeability, the result is a weight of less than 1.5kg for the entire suit.

[0017] This dry suit includes synthetic, waterproof zip fasteners, covered with fire-resistant fabric, which allow the suit to be worn opened at the neck and arms during the entire pre- and post-flight phase for maximum comfort. The openable sleeves 13 at the neck and the forearms offer significantly increased comfort and enable the longer-term wearing while preserving the performance of the wearer on account of low strain and correspondingly less tiredness of the wearer. The waterproof finish of collar 5 consists of an elastic rubber lip 11 made of neoprene, silicone or a material with comparable properties laminated onto flame-resistant fabric, which is divided by main zip fastener 4, however, seals the neck area when the main zip fastener 4 is closed. Just like the collar 5, the cuffs 13 at the ends of the sleeves consist of such a structure, i.e. a rubber lip 12, which is divisible by the zip fasteners 7, laminated onto a flame-resistant fabric of the cuffs 13, the rubber lip 12 being made of neoprene, silicone or a material with comparable properties.

[0018] In combination with the mentioned cooling system having gas or air ducts within the suit 1, prolonged operations are possible even under extreme environmental conditions with high ambient temperature and also in high relative humidity without significant fatigue of the user. Nevertheless, the user is always wrapped in a waterproof and heat-insulating way within seconds, which means that he or she merely needs to completely close the waterproof zip fasteners 4, 7, 9 and 16.

[0019] The target groups for the use of such dry suits are mainly the following professions:
= Pilots/crew members of jet-propelled fighter aircraft.
= Pilots, crew members and passengers of helicopters, transport aircraft and special aircraft.
= Crews and passengers of seagoing vessels.
= Water sportsmen of all kinds (yachtsmen, canoeists, kayakers, surfers, stand-up paddlers etc.).

List of numerals 1 Combination suit 2 Trouser joints 3 Foot bindings 4 Main zip fastener Collar 6 Upper-body garment 7 Zip fastener 7 on the front sleeves 8 Sleeve 9 Zip fastener for closable trouser pocket Closable trouser pocket 11 Elastic rubber lip on collar 5 12 Elastic rubber lips on the cuffs 13 Cuffs 14 Waterproof zip fastener for breast pocket Breast pocket 16 Zip fastener between jacket and trousers 17 Fabric material bridge between jacket and trousers 18 Waterproof zip fastener in the chest area for reaching inside the suit

Claims

What is claimed:

1. A dry suit for keeping dry persons who have fallen into the water to delay their life-threatening hypothermia, which suit is made of a fabric laminate consisting from the outside to the inside of a tear- and flame-resistant fabric, a waterproof membrane with a microporous structure based on polytetrafluoroethylene and an inner fabric, and that has waterproof zippers for putting on and taking off, wherein a waterproof slide fastener divides a collar for opening, wherein a waterproof slide fastener extends along the forearm at each sleeve, that the waterproof closures at a neck and wrists are formed by lips, each of which can be divided by a watertight slide fastener, these lips being laminated onto fire-resistant fabric and, when the slide fasteners are closed, being watertight on the neck or on the inside of the neck are intended to be worn on the wrists, so that the entire suit can be worn open during non-critical mission phases on collars and the waterproof cuffs and thus permits air exchange with the body surface, and that it can be removed from this state by closing all the waterproof zippers and by this can be quickly brought into the waterproof state, and in that the fabric laminate is a three-layer, flame-resistant, waterproof, air-permeable and thus breathable and blowable fabric laminate, which has a basis weight of max. 220 grams/m2 and consists on the outside of the tear- and flame-resistant fabric, followed by a glue layer, then the membrane having a microporous structure based on polytetrafluoroethylene with more than 10 million pores per mm2, so that this membrane is waterproof but vapour-permeable, and then a further glue layer, followed by the fabric having aramid fibres with 40 grams/m2 10% as a protective layer for the inner membrane, so that the total dry suit weighs less than 1.5 kg.

2. A dry suit according to claim 1, wherein the three-layer fabric laminate offers a water resistance and tightness that can withstand a pressure column of up to meters.

3. A dry suit according to claim 1 or claim 2, wherein it is designed as a one-piece combination suit with a waterproof zipper extending from a crotch area up to an upper edge of the collar.
Date Recue/Date Received 2021-06-04

4. A dry suit according to claim 1 or claim 2, wherein it is constructed as a two-part suit of trousers and jacket, except for a textile material bridge between trousers and jacket, and that trousers and jacket are connectable in a hip region to a waterproof zipper surrounding the hip, with one side of the zipper extending at a lower edge of the jacket and one side of the zipper extending at the trouser waistband, wherein the end regions of the zipper overlap laterally offset, including the textile material bridge between jacket and trousers.

5. A dry suit according to any one of claims 1 to 4, wherein it can be worn over an acceleration protective suit without impairing the function of the acceleration protective suit.

6. A dry suit according to any one of claims 1 to 5, wherein it has at least one inwardly recessed breast pocket in the breast region, which can be closed with a waterproof zipper, and a waterproof zipper in the breast region for engaging under a dressed dry suit when it is worn over another suit or acceleration protective suit.

7. A dry suit according to any one of claims 1 to 6, wherein it comprises at least one trouser pocket closable with a waterproof zipper.

8. A dry suit according to any one of claims 1 to 7, wherein the three-layer fabric can withstand air currents of up to approx. 1111.2 km/h undamaged, by an outer fabric being woven from tear-resistant synthetic and aramid fibres.

9. A dry suit according to any one of claims 1 to 8, wherein its inside is additionally equipped with flat gas ducts which can be supplied from a hose sleeve opening outwards in a watertight manner via a hose from a portable compressed gas cylinder with gas expanded therefrom and thus cooled down, wherein the gas ducts on the inside of the dry suit are led to a strongly transpiring body parts and have outlet openings there in order to remove heat from there.

10. A dry suit according to claim 9, wherein the outlet openings of the gas channels are namely in a region of a cross, at hips, in knee cavities, in a neck and chest Date Recue/Date Received 2021-06-04 region, in armpits, at arm joints and at front sleeves, opposite the inner sides of the forearms of the wearer, so that the heat absorbed by the cooling gas can be transported outwardly through the open cuffs and collar as long as the dry suit is used in non-critical mission phases.
Date Regue/Date Received 2021-06-04