The present invention relates to protective garments, and more particularly, to protective garments with vent features.
Protective or hazardous duty garments are widely used in various industries to protect the wearer from various hazardous conditions such as heat, smoke, cold, sharp objects, chemicals, liquids, fumes and the like. The protective garment may include an outer shell layer, a thermal barrier or thermal liner located inside the outer shell, and a moisture barrier located inside the outer shell. The moisture barrier may be made of semi-permeable material such that the moisture barrier is generally liquid impermeable and generally moisture vapor permeable.
The moisture barrier may be located inside the outer shell to block moisture from the ambient environment from passing through the garment, while allowing moisture vapor inside the garment to pass through the moisture barrier. However, although the moisture barrier may be generally permeable to moisture vapor to allow moisture vapor to pass therethrough, moisture vapor may still remain trapped inside the garment. In particular, under heavy work conditions the moisture vapor generated by the wearer (for example, by perspiration) may be generated at a rate greater than that which can pass through the moisture barrier.
In addition, wearers of protective garments may often carry heavy equipment, such as a self-contained breathing apparatus (“SCBA”) tank or the like. Such equipment may be carried on the user's back, which can compress the garment and reduce its thermal protection at such areas of compression.
In one embodiment, the present invention is a protective garment including a heat, flame and abrasion resistant outer shell configured to be worn on at least part of a body of a wearer. The outer shell includes an opening formed therein. The garment further includes a heat and flame resistant air-permeable material, of a different type of material than the outer shell, spanning the opening.
The garment 10 may include various layers through its thickness to provide various heat, moisture and abrasion resistant qualities to the garment 10 so that the garment 10 can be used as a protective, hazardous duty, and/or firefighter garment. For example, the garment 10 may include an outer shell 26, a moisture barrier 28 located inside of and adjacent to the outer shell 26, a thermal liner or barrier 30 located inside of and adjacent to the moisture barrier 28, and an inner liner or face cloth 32 located inside of and adjacent to the thermal barrier 30.
The outer shell 26 may be made of or include a variety of materials, including a flame, heat and abrasion resistant material such as a compact weave of aramid fibers and/or polybenzamidazole fibers. Commercially available aramid materials include NOMEX and KEVLAR fibers (both trademarks of E.I. DuPont de Nemours & Co., Inc. of Wilmington, Del.), and commercially available polybenzamidazole fibers include PBI fibers (a trademark of PBI Performance Fabrics of Charlotte, N.C.). Thus, the outer shell 26 may be an aramid material, a blend of aramid materials, a polybenzamidazole material, a blend of aramid and polybenzamidazole materials, or other appropriate materials. The outer shell 26 can also be made of a thermostable organic polymer material, such as KERMEL® material sold by Kermel SAS of Colmar, France.
If desired, the outer shell 26 may be coated with a polymer, such as a durable, water repellent finish (i.e. a perfluorohydrocarbon finish, such as TEFLON® finish sold by E. I. Du Pont de Nemours and Company of Wilmington, Del.). The materials of the outer shell 26 may have a weight of, for example, between about five and about ten oz./yd2.
The moisture barrier 28 and thermal barrier 30 may be generally coextensive with the outer shell 26, or spaced slightly inwardly from the outer edges of the outer shell 26 (i.e., spaced slightly inwardly from the outer ends of the sleeves 24, the collar 34 and from the lower edge of the garment 10) to provide moisture and thermal protection throughout the garment 10. The moisture barrier 28 may include a semi-permeable membrane layer 28a and a substrate 28b.
The membrane layer 28a may be generally water vapor permeable but generally impermeable to liquid moisture. The membrane layer 28a may be made of or include expanded polytetrafluoroethylene (“PTFE”) such as GORE-TEX or CROSSTECH materials (both of which are trademarks of W.L. Gore & Associates, Inc. of Newark, Del.), polyurethane-based materials, neoprene-based materials, cross-linked polymers, polyamid, or other materials. The membrane layer 28a may have microscopic openings that permit moisture vapor (such as water vapor) to pass therethrough, but block liquids (such as liquid water) from passing therethrough. The membrane layer 28a may be made of a microporous material that is either hydrophilic, hydrophobic, or somewhere in between. The membrane layer 28a may also be monolithic and may allow moisture vapor transmission therethrough by molecular diffusion. The membrane layer 28a may also be a combination of microporous and monolithic materials (known as a bicomponent moisture barrier), in which the microporous or monolithic materials are layered or intertwined.
The membrane layer 28a may be bonded or adhered to a substrate 28b of a flame and heat resistant material to provide structure and protection to the membrane layer 28a. The substrate 28b may be or include aramid fibers similar to the aramid fibers of the outer shell 26, but may be thinner and lighter in weight. The substrate 28b may be woven, non-woven, spunlace or other materials. In the illustrated embodiment, the membrane layer 28a is located between the outer shell 26 and the substrate 28b. However, the orientation of the moisture barrier 28 may be reversed such that the substrate 28b is located between the outer shell 26 and the membrane layer 28a.
The thermal barrier 30 may be made of nearly any suitable flame resistant material that provides sufficient thermal insulation. In one embodiment, the thermal barrier 30 may include a layer of bulk material 30a in the form of relatively thick (i.e. between about 1/16″- 3/16″) batting, felt or needled non-woven bulk or batting material. The bulk material 30a can include aramid fiber batting (such as NOMEX batting), aramid needlepunch material, an aramid non-woven material, an aramid blend needlepunch material, an aramid blend batting material, an aramid blend non-woven material, foam (either open cell or closed cell), or other suitably thermally insulating materials. The bulk material 30a may trap air and possess sufficient loft to provide thermal resistance to the garment 10.
The bulk material 30a may be quilted to a thermal barrier face cloth 30b which can be a weave of a lightweight aramid material. Thus, either the bulk material 30a alone, or the bulk material 30a in combination with the thermal barrier face cloth 30b, may be considered to constitute the thermal barrier 30. In the illustrated embodiment, the thermal barrier bulk material 30a is located between the outer shell 26 and the thermal barrier face cloth 30b. However, the orientation of the thermal barrier 30 may be reversed such that the face cloth 30b is located between the outer shell 26 and the bulk layer 30a. In one embodiment, the thermal barrier 30 (or the garment 10 as a whole) may have a thermal protection performance (“TPP”) of at least about twenty, and the garment 10 as a whole may have a TPP of at least about thirty-five. If desired, the thermal barrier 30 may be treated with a water-resistant or water-repellent finish.
Although the moisture barrier 28 is shown as being located between the outer shell 26 and the thermal barrier 30, the positions of the moisture barrier 28 and thermal barrier 30 may be reversed such that the thermal barrier 30 is located between the outer shell 26 and the moisture barrier 28, or various other orientations or configurations may be used.
The face cloth 32 may be the innermost layer of the garment 10, located inside the thermal barrier 30 and moisture barrier 28. The face cloth 32 can provide a comfortable surface for the wearer and protect the thermal barrier 30 and/or moisture barrier 28 from abrasion and wear. The face cloth 32 may be quilted to the adjacent layer (i.e. the thermal barrier 30 in the illustrated embodiment). However, the face cloth 32 is optional and may be excluded if desired. In addition, the garment 10 may not necessarily include the moisture barrier 28 and/or the thermal barrier 30 in certain cases.
Each layer of the garment 10 disclosed herein, including the layers and components described above, as well as those described below, and the garment 10 as a whole, may meet the National Fire Protection Association (“NFPA”) 1971 standards for protective firefighting garments (“Protective Clothing for Structural Firefighting”), which are entirely incorporated by reference herein. The NFPA standards specify various minimum requirements for heat and flame resistance and tear strength. For example, in order to meet the NFPA standards, the outer shell 26, moisture barrier 28, thermal barrier 30 and face cloth 32 must be able to resist igniting, burning, melting, dripping, separation, and/or shrinking more than 10% in any direction after being exposed to a temperature of 500° F. for at least five minutes. Furthermore, in order to meet the NFPA standards, the combined layers of the garment 10 must provide a thermal protective performance rating of at least thirty-five.
Alternately or in addition to the NFPA Standard 1971, the garment 10 disclosed herein may also meet European Norm (“EN”) standards for firefighting garments set by the European Committee for Standardization (also known as Comite Europeen de Normalisation (“CEN”)). These standards include EN 469:2005 Level 1 and Level 2 certification. The EN standards for firefighter and protective garments are entirely incorporated by reference herein.
As shown in
A filler layer or material 40 may be positioned in the opening 38. In the illustrated embodiment the filler material 40 entirely fills and covers/spans the opening 38. The filler material 40 may be coupled to the outer shell 26 about the entire perimeter, or substantially the entire perimeter, of the filler material 40/opening 38. The filler material 40 may be generally co-planar with the outer shell 26, and may lack any portions that lie on top of, or overlap with, the outer shell 26. The filler material 40 can made of a low weight, flame-resistant, high thermal insulation material (i.e. having at least about the same thermal insulation properties as those of the thermal liner 30 described above), including but not limited to PEEK (Polyether ether ketone) or flame resistant meta-aramid material, such as NOMEX® material. The filler material 40 may be a knit material made with various knitted constructions, such as flat, circular, jersey, interlock, rib, mesh, power mesh, tricot, warp, fleece, terry or the like. The filler material 40 may be a layered or matrix material with an appreciable thickness such that the filler material 40 traps air therein to provide superior thermal insulating characteristics to the garment 10, and made of a different material than the rest of the outer shell 26 and/or moisture barrier 28 and/or thermal barrier 30.
The improved thermal insulation provided by the filler material 40 can be particularly useful since firefighters often carry SCBA tanks or the like on their backs. The weight provided by the SCBA tanks compress the backs of the garment 10, which reduces the thermal insulation of the garment 10 at the area of compression. Thus, the improved thermal insulation provided by the filler material 40 helps to offset the loss of insulation due to compression when carrying the SCBA tank. In addition, the filler material 40 can act as a cushion to protect the wearer's back from the SCBA tank or other equipment.
The filler material 40 may flush with, recessed relative to, or protrude outwardly relative to the surrounding outer shell 26 and may have a variety of thickness, such as at least about 1/16″, or at least about ¼″ or less than about ½″, or less than about 1″, or between about 1/16″ and about ½″. The filler material 40 should be sufficiently thick to provide thermal insulation and cushioning, but not so thick as to add undesired bulkiness to the garment 10, or create difficulties in manufacturing. In addition, although the filler material 40 generally traps air therein, the matrix of the filler material 40 may have sufficiently large gaps that liquids, such as liquid water, is generally not trapped in the filler material 40 due to capillary or other forces. In addition, the filler material 40 may be made of non-moisture absorbent and/or hydrophobic materials. In this manner the filler material 40 does not trap/absorb moisture, which trapped/absorbed moisture could increase the thermal conductivity of the filler material 40.
The filler material 40 may be made of a mesh or other material with openings or gaps formed therein that are sufficiently large that the filler material 40 is air permeable, water permeable and moisture vapor permeable. The vent 36/opening 38 thus enables relatively large volumes of air to be expelled through the vent 36, thereby enabling moisture vapor-laden air located inside the outer shell 26 of the garment 10 to be exhausted or expelled, such as by natural or force convection. Air positioned within the outer shell 26 of the coat 10 can also be expelled through the vent 36 by various forces, including by the movement of the wearer. For example, natural movements of the wearer, such as lifting, walking, crawling, etc. will cause billowing and deflation of the garment 10, thereby forcing air through the vent 36.
The filler material 40 may also be generally elastic, being elastically stretchable by its construction (e.g. knit arrangement) and/or by the elastic stretching of individual fibers, such as spandex or elastane fibers, which may be blended with generally non-elastic flame resistant fibers. Commercially available spandex fibers include LYCRA® or ELASPAN® sold by Invista North America of North Wichita Kans.; CREORA® sold by Hyosung Corporation or the Republic of Korea; ROICA® and DORLASTAN® sold by Asahi Kasei Fibers Corporation of Japan; LINEL® sold by Fillattice S.P.A. of Monza, Italy; or ESPA™ sold by TOYOBO CO., LTD of Osaka, Japan.
In one case the filler material 40 can be stretched at least about 5% in its length or width direction when stretching forces are applied thereto without breaking or tearing, and return to its original shape when the stretching forces are removed. The filler material 40 thus provides flexibility to the garment 10, particularly along the back panel 18, and even more particularly in the lateral (horizontal) direction across the shoulders/upper back of the garment 10. In this manner, when a wearer leans forward, bends down, raises his or her arms, moves his or her arms forwardly, etc., the filler material 40 is stretched to provide ease of movement to the wearer, without compromising the protection provided by the garment 10. In some cases, the filler material 40 may have a directional stretch property such that the filler material 40 is more elastic in a particular direction (e.g. laterally, in one case; vertically in another) compared to other directions. The filler material 40 can be configured to accommodate horizontal/lateral stretching alone, or lateral stretching in combination with other directions (vertical, diagonal, etc.).
The garment 10 may include a protective flap 42 positioned on the back panel 18 and covering the opening 38/filler material 40. In particular, in the illustrated embodiment the flap 42 is generally hexagonal, and includes an upper edge 44a, lower edge 44b, upper side edges 44c, 44d and lower side edges 44e, 44f. The flap 42 can have a variety of shapes and be made of a variety of materials, but in one case is made of the same materials as the outer shell 26 described above.
The flap 42 is positioned over, and covers, the opening 38/filler material 40 to protect those components from wear and abrasion, to provide thermal protection, and to reduce the penetration of moisture or hazardous materials into the garment 10. The flap 42 may have a footprint/shape/size larger than that of the opening 38/filler material 40 such that the flap 42 extends beyond the opening 38/filler material 40 around the entire perimeter of the opening 38/filler material 40. Thus, the flap 42 may be shaped and positioned such that there is generally no direct path (in a direction perpendicular to the surface of the outer shell 26) from the outside of the garment 10 through the opening 38/filler material 40.
In one embodiment the flap 42 is secured to the back panel 18/outer shell 26 by stitching or the like extending along the upper edge 44a, lower edge 44b and upper side edges 44c, 44d (it thus should be understood that
As shown in
The moisture barrier 28 may include certain features to limit the expansion of the moisture barrier 28/vents 52, and ensure that vents 52 remain generally closed and provide at least some moisture barrier protection at all positions. In particular, as shown in
The loops 50 may be configured and positioned have some slack during normal wear (i.e. when the wearer's arms at his/her side). However, when the moisture barrier 28/back panel 18 is sufficiently stretched (i.e. when a wearer reaches forward), the loops 50 may be pulled taut and limit any further expansion/movement of the moisture barrier 28/back panel 18 in the lateral direction. The loops 50 thereby limit the amount by which the moisture barrier 28/vents 52 can be stretched, particularly laterally, to ensure the moisture barrier 28 provides sufficient protection and is not over-expanded, to avoid exposing the open vents 52. The interlocking loops 50 could be replaced with other structure that provides similar features, such as a strap of material coupled directly to the portions 52a, 52b of the vent 52.
Various other arrangements may be provided to the moisture barrier vents 52. For example, in order to provide some flexibility to the moisture barrier 28, in some cases one or more straps 48 (
The moisture barrier 28 may also provide venting at other locations. For example,
In the illustrated embodiment, the vent 58 is positioned about the upper portions of the sleeve 24 of the garment 10; i.e. extending at least about 180 degrees, or about 270 degrees (of a possible 360 degrees) in one case, and thus may not extend around the entire perimeter of that area of the garment 10/moisture barrier 28. However, the vent 58 can take any of a wide variety of shapes and configurations beyond those specifically shown in the drawings, and located at various positions. For example, such moisture barrier vents can be positioned at various other portions on the torso of the garment (besides the back), such as on the underarm, the top of the shoulder, at the neck, elbow, wrist, waist or other locations. Moisture barrier vents can also be positioned at various positions on a pair of trousers, such as at the front and/or back of the knees, at the ankle, at the crotch, yoke, seat or waist, etc. The vents and other features described herein can also be used in conjunction with garments besides coats, such as trousers (as noted above), jump-suits, vests, etc.
As noted above, in some cases, a vent in the moisture barrier 28, as shown in
Having described the invention in detail and by reference to the preferred embodiments, it will be apparent that modifications and variations thereof are possible without departing from the scope of the invention.
This application is a continuation of U.S. patent application Ser. No. 13/564,861, filed on Aug. 2, 2012, which in turn claims priority to U.S. Provisional Patent Application Ser. No. 61/514,245, filed on Aug. 2, 2011. The entire contents of both of these applications are incorporated herein by reference.
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Number | Date | Country | |
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20150224349 A1 | Aug 2015 | US |
Number | Date | Country | |
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61514245 | Aug 2011 | US |
Number | Date | Country | |
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Parent | 13564861 | Aug 2012 | US |
Child | 14694233 | US |