WO1991003279A1 - Improvements in or relating to safety helmets - Google Patents
Improvements in or relating to safety helmets Download PDFInfo
- Publication number
- WO1991003279A1 WO1991003279A1 PCT/GB1990/001324 GB9001324W WO9103279A1 WO 1991003279 A1 WO1991003279 A1 WO 1991003279A1 GB 9001324 W GB9001324 W GB 9001324W WO 9103279 A1 WO9103279 A1 WO 9103279A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- helmet
- wearer
- safety helmet
- annular seal
- aperture
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
- A62B18/082—Assembling eyepieces, lenses or vision-correction means in or on gas-masks
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/04—Gas helmets
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
- A62B18/084—Means for fastening gas-masks to heads or helmets
Definitions
- This invention relates to safety helmets and, more specifically, to safety helmets for use in combination with breathing apparatus.
- Virtually all conventional safety helmets are capable of being used with conventional mask-type breathing apparatus and wherein the breathing apparatus includes a flexible mask held to the forward regions of the wearer's face by a network of straps or bands which pass over and around the head of the wearer.
- the mask defines a breathable volume forward of the breathing apertures of the wearer and the apparatus includes a valve arrangement for controlling the air supply to the mask.
- the air supply duct is connected to those regions of the mask most remote from the face of the wearer and with such a breathing apparatus fitted the wearer can readily don a conventional safety helmet.
- valve arrangements for conventional breathing apparatus are relatively large and, for such breathing apparatus as is intended to afford protection against a hazardous environment, the mask extends to the upper regions of the wearer's face and includes an aperture, closed by a see- through panel. Because of the limited size of the mask the see-through panel is relatively small and restricts the wearer's vision.
- a serious problem with helmet/conventional breathing mask arrangements as defined above resides in the fact that the helmet is completely independent of the breathing apparatus and the helmet is ill-fitting and uncomfortable on the straps supporting the breathing mask. Further, with the forward regions of the mask supporting the valve arrangement and air supply duct, the forward mask parts project forward of the brim of the helmet and the helmet affords little, if any, protection for the said forward parts of the breathing apparatus.
- the forwardly projecting valve arrangement and air connections to the mask are susceptible to dislodgement, particularly in poor visibility and crowded conditions, and if dislodged the hazardous atmosphere can enter the breathable volume of the mask, to the detriment of the wearer.
- Such helmets generally made from a plastics material, conveniently include a large aperture, closed by a see-through panel, with a flexible seal extending from the periphery of the see-through panel inwardly of the helmet to define a seal with the face of the wearer.
- a flexible seal extending from the periphery of the see-through panel inwardly of the helmet to define a seal with the face of the wearer.
- the whole of the face of the wearer is open to the enclosed volume defined by the seal, the see-through panel and the face of the wearer.
- Valve arrangements often attached externally to the helmet, duct breathable atmosphere to the said volume and some such helmets may include an exhalation valve, generally passing through the see-through panel, and through which valve exhaled air is exhausted.
- the present invention seeks to provide a safety helmet capable of being selectively used with or without a breathing apparatus.
- a safety helmet characterised by quick-release means for selectively attaching a breathing apparatus to said helmet.
- the said helmet is adapted to totally encase the head of the wearer and includes a see-through aperture through its forward regions. - -. -
- the helmet is used in combination -with a rigid, closed frame, said frame being located within the helmet, concentric with the said aperture.
- the said closed frame supports an annular seal having one continuous end in sealed relationship with the frame and concentric therewith.
- the continuous end of said seal remote from the said frame is arranged to engage the face of the wearer across the forehead, down the cheeks and across the chin.
- the helmet includes a harness comprising straps for supporting the helmet on the head of the wearer and a padding engageable with the rear of the head of the wearer.
- the said annular seal is resilient and the said straps of said harness are adjustable to allow the front to rear position of said padding to be adjusted relative to the said annular seal.
- the said see-through aperture in the helmet is totally closed by a see-through panel.
- an exhalation valve is supported by the said see- through panel.
- a nose cone extends from the said see- through panel to engage the face of the wearer with a continuous seal surrounding the breathing ducts of the wearer, said exhalation valve is arranged to exhaust from the volume defined by said nose cone and said nose cone includes valve means for allowing air flow from the said volume defined by the said annular seal, the see-through panel and the face of the wearer into said nose cone.
- the helmet includes
- SUBSTITUTE SHSET with valve means and air ducts, arranged to supply pressure air from an air source externally of the helmet to the volume forward of the wearer's face and defined by the said annular seal, the see-through panel and the face of the wearer bounded by the said annular seal.
- said rigid closed frame is detachably retained within the helmet by said quick-release devices and said annular seal, said see-through panel, said valve means and said air ducts are supported by said rigid closed frame to be detachable therewith.
- the helmet preferably includes an internal cavity below the aperture and said valve means and air ducts are attached to the lower regions of said rigid closed frame and are housed in said internal cavity when the closed frame is fitted to the helmet.
- the volume forward of the wearer's face and bounded by the annular seal is open to the surrounding environment through the opening in the frame and the aperture in the helmet.
- said rigid closed frame is detachably retained within the helmet by said quick release devices and said annular seal is supported by said rig:Ld closed frame to be detachable therewith.
- said quick-release means comprise rotatable devices adjacent the aperture through the helmet and arranged in one rotational position for each device to securely clamp the said closed frame with the helmet and in another rotational position for each device to release the said closed frame from the helmet.
- a rigid closed frame having only the annular seal secured thereto is rapidly and readily interchangeable with a rigid closed frame supporting a see- hrough panel closing the annular seal and a breathing apparatus.
- a duct connects the volume defined by the annular seal to the atmosphere externally of the helmet.
- the said duct comprises a flexible connection between the volume within the annular seal and an aperture through the helmet.
- said duct is selectably closable by an air supply assembly.
- said air supply assembly comprises an air supply valve arrangement contained in a housing and an air supply from a air reservoir to said air supply valve arrangement and said quick- release mean comprise means for selectively connecting or disconecting the air outlet from said housing to said duct.
- said quick-release means comprise interrupted screw means presented by said housing and said duct.
- Fig. 1 shows a cross section, on the central plane passing front to rear of a helmet, with a breathing apparatus attachment.
- Fig. 2 shows, diagranmatically, a view of the forward lower regions of the mask, from the inside, with breathing apparatus contained therein,
- Fig. 3 shows a cross section in the same plane as that for
- FIG. 1 of an open front helmet attachment for use with the helmet illustrated in Fig. 1,
- Fig. 4 shows a plan view of a quick-release device in accordance with the invention
- Fig. 5 shows a side view of the quick-release device shown in Fig. 4,
- Fig. 6 shows an underneath view of the quick-release device shown in Fig. 4 and 5.
- Fig. 7 shows one end view of the quick-release shown in
- Fig. 8 shows, in perspective view, a fragment of the rigid closed frame and annular seal with an integral lug engageable by the quick-release device.
- Fig. 9 shows, a left side view of the lower forward region of a safety helmet incoporating means for selectively connecting a further embodiment breathing apparatus to the helmet,
- Fig. 10 shows a cross-section through the left side of the helmet on the line II II in Fig. 9,
- Fig. 11 shows a side view of a breathing apparatus connecting means for use with the helmet shown in Figs. 9 and 10, and
- Fig. 12 shows a view of the breathing apparatus connecting means in the direction of the arrow A.
- the helmet illustrated in Fig. 1 conveniently comprises a one piece helmet 11, made from a plastics material conventionally by a moulding process, with an aperture 12 in the forward regions thereof.
- the helmet 11 is of thickened material, indicated at 11a, around the neck aperture to ensure a safety edge therefore.
- the helmet 11 includes an internal harness comprising a top pad 13, supported on each side by resilient straps
- each strap 14 passing through a slot in an anchor plate 15 secured by a screw 16 engaged in a nut (not shown) moulded into the helmet shell.
- the pad 13 is intended to contact the head of the wearer, thus to support the top of the helmet in spaced relationship with the head of the wearer.
- the harness also includes a back pad 17, pivotably connected at its upper regions to the rearmost regions of the pad 13, and pad 17 is further supported on each side by a resilient strap 18, which passes through a slot in an anchor plate 19 secured to the helmet by a screw 20 engaged in a nut (not shown) moulded into the helmet shell.
- the pad 17 had its lower regions 17a extending adjacent to, and preferably projecting from, the neck opening of the helmet 11 -whereupon the wearer can manually displace the lower regions of the pad 17 towards the rear of the helmet 11 to assist in donning and removing the helmet 11.
- the pad 17 also includes side straps 21, attached one to each side of the pad 17 near its lowermost regions, each strap 21 include a row of stud fastener sockets 22a, 22b, 22 , 22rl and 22e ⁇ selectively engageable with the cooperating part of a stud fastener (not shown) secured to the helmet and, in the .present example, located in the region of the fastener 22_b as illustrated.
- the helmet also includes a peak member 23, made from a transparent material, secured to the shell immediately above the aperture 12 and projecting downwardly to partially close the aperture 12 and forwardly of the helmet to divert small falling solids or liquids away from the aperture 12. In the example illustrated in Fig.
- the helmet is provided with a breathing apparatus attachment comprising a see-through panel 24 which closes the aperture 12, with a resilient sealing element 25 interposed between the peripheral regions of the see-through panel 24 and the helmet surface adjacent the aperture 12.
- An annular seal 26 has one continuous or radial end region 26a splayed outwardly and contacting the peripheral regions of the inner surface of the see-through panel 24 and the assembly is retained by a rigid closed frame 27.
- the elements 24, 25, 26, and 27 are concentric with the aperture 12 and preferably the elements 25, 24, 26ji and 27 are bonded together as, for example, by an adhesive so as to form a composite assembly.
- the lower forward regions of the helmet 11, that part of the helmet 11 below aperture 12, is formed to provide enlarged internal cavity, generally indicated by reference llb_, and the frame 27 includes an extension 27a extending into said cavity to support an air supply and control valve arrangement 28 for a breathing apparatus.
- the valve arrangement 28 is provided with pressure air via a duct 29 which extends from the valve arrangement 28 through the neck aperture in the helmet, conveniently to one side of the neck aperture, and said duct 29 extends to a pressure air reservoir (not shown) such as a cylinder carried by the wearer of the helmet 11 as a back pack.
- the valve arrangement 28 includes a sensor duct 30, which projects through the frame 27 and the seal 26 so as to be open to the atmosphere within the annular seal 26.
- the duct 30 is open to a manifold 31 which is open to a sensing port in the valve arrangement 28 whereupon, on sensing a pressure below a predetermined pressure via the sensor duct 30, the valve 28 is arranged to open to allow air flow from the duct 29 through the valve arrangement 28 to a manifold 32 from which the air flows via an outlet 33 into the volume within the bore of seal 26.
- the valve arrangement 28 may also include a manual over-ride, generally indicated at reference 34, and which can be nanually actuated by the wearer, or any other person in the vicinity, pushing a finger up the neck aperture of the helmet to press the over-ride button 34, thus allowing air flow into the volume within seal 26, if the wearer should experience breathing difficulties.
- a manual over-ride generally indicated at reference 34, and which can be nanually actuated by the wearer, or any other person in the vicinity, pushing a finger up the neck aperture of the helmet to press the over-ride button 34, thus allowing air flow into the volume within seal 26, if the wearer should experience breathing difficulties.
- the breathing assembly further includes an exhalation valve 35 which passes through the see-through panel 24 and supports, at its inner end, a nose cone, generally indicated by numeral 36, and which includes two one-way valves 37 one on each of its sides.
- the nose cone 36 may be forwardly and rearwardly displaceable by adjusting means, well known in the art, included in the exhalation valve assembly.
- the frame 27 further includes, at each of its opposite side edge regions, an integral lug 27b with an arcuate recess 21 c_ in its peripheral edge region, as shown in Fig. 8.
- the sealing element 25, the see-through panel 24, the annular seal 26, the valve arrangement 28, the manifolds 31 and 32 and the ducts 30, 33 and 29, are all supported by the rigid closed frame 27 and the frame 27 and all the elements supported by said frame 27 comprise an assembly detachable from the helmet 11.
- quick-release device suitable for supporting the rigid frame 27 and its supported assembly with the helmet illustrated in Figs. 1 and 2 is shown in Figs. 4, 5, 6 and 7 and wherein the quick-release device comprises a solid body, generally indicated by numeral 40, with an aperture 41 therethrough by which the body 40 is pivotably attached to the helmet ' via a pivot screw 42, secured in a nut (not shown) embedded in the helmet 11.
- the aperture 41 is counter-bored, as at 41a_, to receive the head of the screw 42 therein.
- the body 40 includes, at its end regions most remote from the aperture 41, a cylindrical element 43, having its axis parallel to the axis of the aperture 41, and a roof-like projection part 44 above the cylindrical element 43 extends radially and terminates forwardly of the said element 43.
- each quick release device 40 to 44 engages in the adjacent arcuate recess 27c in the adjacent lug 27b.
- the quick-release devices 40 to 44 are in pressure contact with their respective arcuate recesses 27 'c_ in the frame 27 and thus, with pressure contact on its side edge regions, the frame 27 compresses the sealing element 25 between the helmet surface and see-through panel 24, thereby effectively sealing the opening 12 from the surrounding environment.
- the wearer can then make final adjustments to the fitting of the helmet 11, by holding the helmet 11 between the hands and pushing back with the head against the rear pad 17 to ensure a comfortable sealing fit with the seal 26, and the helmet is then secured by pulling the straps 21 forwardly and securing the appropriate press stud fitting 21a to 21e_ to the respective press stud fastener.
- the seal 26 With the helmet 11 firmly, but comfortably, fitted to the wearer the seal 26 is in sealing contact with the wearer's face across the forehead, down the cheeks and across the chin and the volume defined by the panel 24, annular seal 26 and the face of the wearer, hereinafter called “the first volume” is being continuously sensed by the sensor duct 30.
- the sensor duct 30 detects a pressure fall in the said volume, below a predetermined pressure which is preferably slightly above atmosphere, the valve arrangement 28 is actuated to supply air via manifold 32 and duct 33 to said first volume.
- the pressure in the said first volume rises above the said predetermined pressure the elevated pressure is sensed by the duct 30 and the air supply though valve 28 is terminated.
- the breathing ducts of the wearer open to the volume within the nose cone 37, hereinafter called “the second volume,” and on inhaling air flows from the said first volume to the second volume via the one way valves 37 and, on exhaling, the valves 37 close and the exhaled air is exhausted from the second volume via the exhalation valve 35.
- the second volume the volume within the nose cone 37
- the valves 37 close and the exhaled air is exhausted from the second volume via the exhalation valve 35.
- Fig. 3 shows an alternative attachment for the helmet 11 when the breathing apparatus assembly 24 to 37 had been removed from the helmet 11.
- the attachment illustrated in Fig. 3 comprises a resilient sealing element 51, intended to contact the internal surface of the helmet 11 surrounding the aperture 12, an annular seal 52, which may be identical with the annular seal 26 illustrated in Fig. 1 and which includes an outwardly turned flange region 52a in contact with the sealing element 51, and a rigid closed frame 53, identical to the rigid frame 27 and which includes lugs 53b, identical with the lugs 27b of the frame 27 shown in Fig. 1.
- the sealing element 51, the flanged part 52a_ of the seal 52 and the frame 53 are secured together, conveniently by an adhesive, to form a composite assembly.
- the attachment 51 to 53 is fitted to the helmet in identical manner to the breathing apparatus assembly 24 to 37, in that the sealing element 51 is located against the internal surface of the helmet 11 surrounding the aperture 12 and the quick-release devices 40 to 44 are rotated until each roof- like elements 44 engage with the free surface 57d of the associated lug 53a_ and the cylindrical element 43 is located in the recess 53c of the adjacent lug 53b.
- the sealing element 51 in the attachment 51 to 53 is at least as thick as the combined thickness of the sealing element 25 and the panel 24 in the Fig. 1 embodiment so that the roof-like parts 44 of the quick- release devices are in pressure contact with the free surface 53d_ on- their respective lugs 53b and the cylindrical elements 43 are in pressure contact with their respective arcuate recesses 53c, whereupon the rigid frame 53 causes the resilient sealing element 51 to be in compression, thus to retain the assembly 51 to 53 securely with the helmet 11.
- the helmet 11 With the attachment 51 to 53 secured within the helmet 11 the helmet 11 is donned in identical manner to that described above with reference to the Figs. 1 and 2 embodiment, the free edge of the seal 52 makes the same seal with the face of the wearer as described for the Fig. 1 embodiment but, in this case, the volume forward of the wearer's face exposed within the seal 52 is open to atmosphere.
- the seal 52 in combination with the rear pad
- the helmet arrangement described above, in combination with the breathing apparatus attachment 24 to 37 and with the inter-changeable attachment 51 to 53 available, is particularly advantageous for fire fighting applications where, on route for a fire, all the fire fighting personnel may fit the breathing apparatus attachment 24 to 37, to the helmet and cement the air supply duct 29 to an air supply tank carried as a back pack.
- a helmet 51 is substantially identical to the helmet 11 illustrated in Fig. 1, with the exception that the see-through panel 24, the annular seal 26 and the rigid closed frame 27 are permanently secured in the helmet 11 and the helmet shell includes an aperture 52 adjacent the left side edge of the see-through panel 24.
- a sleeve 53 is located in the aperture 52 and said sleeve 53 defines a cylindrical section 54 adjacent one end region 53, a radial flange 55 and a threaded section 56 on that side of the flange 55 remote from the cylindrical part 54.
- the sleeve 53 has a through bore 57 with an interrupted screw thread 58 in that end of said bore radially aligned with the threaded section 56.
- the sleeve 53 is secured in the aperture 52 by passing the threaded section 56 from the inside of the helmet through said aperture 52 so that said threaded 56 projects externally of the helmet and the sleeve 53 is secured by a nut 59 engaged on said threaded part 56.
- the nut 59 is firmly secured on the thread 56, whereupon the helmet shell 51 surrounding the aperture 52 is firmly trapped between the flange 55 and the nut 59 and the sleeve 53 is securely held against rotation.
- a flexible tubular element 60 presents a cylindrical section 61 into which the cylindrical section 54 of the C sleeve 53 is entered and secured, as by an adhesive, or by a jubilee clip surrounding the cylindrical section 61.
- the mid- region 62 of the tubular element 60 is of concertina form and the end region 63 remote from section 61 is cylindrical and includes a radial flange 64 on its outer end.
- the flange 63 5 and the end region 63 enter through an aperture 65 in the seal 26 and the annular flange 64 is bonded to the seal 26 to define a gas tight seal therewith.
- the breathing apparatus attachment for the helmet comprises a valve housing 70 of generally cylindrical form 5 with a concentric boss 71.
- the boss 71 includes an interrupted screw thread, defined by elements 72 and a duct 73 from an air supply source (not shown) ducts air to the valve housing 70.
- the external diameter of the screw thread elements 72 0 is such that with the screw thread elements 58 and 72 out of alignment the boss 71 can enter into the bore 57 of the sleeve 53.
- the housing 70 includes a conventional breathing apparatus demand valve, arranged to supply air to the bore 57 5 of sleeve 53, and via bore of the tubular element 60 to the volume defined by the annular seal 26, the see-through panel and the face of the wearer, when the pressure in said volume falls below a predetermined level.
- the valve arrangement may also include a manually actuable by-pass actuator button 75 arranged to by-pass the demand valve, to supply air directly through the valve
- a resilient seal 74 is provided on the radial face of the housing 70 and surrounding the boss 71 and said member 74 is compressed between the nut 59 and the radial face of the
- the radial position of the sleeve 53 is so selected that when the housing 70-71 is locked with the sleeve 53 the duct 73 is lying in its natural unstressed position to extend
- housing 70-71 may include a latch mechanism (not shown) engageable with the sleeve 53, nut 59 or the helmet casing 51
Landscapes
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Helmets And Other Head Coverings (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Glass Compositions (AREA)
- Multicomponent Fibers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019920700482A KR920703153A (en) | 1989-09-01 | 1990-08-28 | Improved safety helmet |
FI920872A FI920872A0 (en) | 1989-09-01 | 1992-02-27 | FOERBAETTRINGAR I SKYDDSHJAELMAR ELLER I ANSLUTNING TILL DESSA. |
NO920796A NO920796D0 (en) | 1989-09-01 | 1992-02-28 | SAFETY HELMET |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8919825.3 | 1989-09-01 | ||
GB898919825A GB8919825D0 (en) | 1989-09-01 | 1989-09-01 | Improvements in or relating to helmets |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991003279A1 true WO1991003279A1 (en) | 1991-03-21 |
Family
ID=10662407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1990/001324 WO1991003279A1 (en) | 1989-09-01 | 1990-08-28 | Improvements in or relating to safety helmets |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0489815A1 (en) |
JP (1) | JPH05500017A (en) |
KR (1) | KR920703153A (en) |
AU (1) | AU637825B2 (en) |
CA (1) | CA2065300A1 (en) |
FI (1) | FI920872A0 (en) |
GB (1) | GB8919825D0 (en) |
HU (1) | HUT64244A (en) |
WO (1) | WO1991003279A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2767264A1 (en) * | 1997-08-16 | 1999-02-19 | Draeger Aerospace Gmbh | Protective helmet and respirator for use in toxic environments |
US6371116B1 (en) | 1999-06-24 | 2002-04-16 | Todd A. Resnick | Method and apparatus for pressurizing a protective hood enclosure with exhaled air |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2223345A1 (en) | 1997-12-03 | 1999-06-03 | Bombardier Inc. | Full face helmet with breathing mask |
CA2422394A1 (en) | 2002-03-12 | 2003-09-12 | Bombardier Inc. | Breathing mask adjuster |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2935985A (en) * | 1951-11-19 | 1960-05-10 | Int Latex Corp | Airtight helmet |
US3258010A (en) * | 1963-06-19 | 1966-06-28 | Mine Safety Appliances Co | Protective headgear |
GB2133275A (en) * | 1983-01-11 | 1984-07-25 | Draegerwerk Ag | Protective headgear with readily-releasable mask |
DE3509784A1 (en) * | 1985-03-19 | 1986-09-25 | R. F. Koch GmbH & Co KG, 6904 Eppelheim | Head part for a protective garment |
GB2182568A (en) * | 1985-09-13 | 1987-05-20 | Total Inert Maintenance & Engi | Improvements in or relating to breathing apparatus |
-
1989
- 1989-09-01 GB GB898919825A patent/GB8919825D0/en active Pending
-
1990
- 1990-08-28 CA CA002065300A patent/CA2065300A1/en not_active Abandoned
- 1990-08-28 HU HU9200681A patent/HUT64244A/en unknown
- 1990-08-28 JP JP2512415A patent/JPH05500017A/en active Pending
- 1990-08-28 KR KR1019920700482A patent/KR920703153A/en not_active Application Discontinuation
- 1990-08-28 WO PCT/GB1990/001324 patent/WO1991003279A1/en not_active Application Discontinuation
- 1990-08-28 EP EP90913277A patent/EP0489815A1/en not_active Withdrawn
- 1990-08-28 AU AU63450/90A patent/AU637825B2/en not_active Ceased
-
1992
- 1992-02-27 FI FI920872A patent/FI920872A0/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2935985A (en) * | 1951-11-19 | 1960-05-10 | Int Latex Corp | Airtight helmet |
US3258010A (en) * | 1963-06-19 | 1966-06-28 | Mine Safety Appliances Co | Protective headgear |
GB2133275A (en) * | 1983-01-11 | 1984-07-25 | Draegerwerk Ag | Protective headgear with readily-releasable mask |
DE3509784A1 (en) * | 1985-03-19 | 1986-09-25 | R. F. Koch GmbH & Co KG, 6904 Eppelheim | Head part for a protective garment |
GB2182568A (en) * | 1985-09-13 | 1987-05-20 | Total Inert Maintenance & Engi | Improvements in or relating to breathing apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2767264A1 (en) * | 1997-08-16 | 1999-02-19 | Draeger Aerospace Gmbh | Protective helmet and respirator for use in toxic environments |
US6371116B1 (en) | 1999-06-24 | 2002-04-16 | Todd A. Resnick | Method and apparatus for pressurizing a protective hood enclosure with exhaled air |
Also Published As
Publication number | Publication date |
---|---|
HU9200681D0 (en) | 1992-05-28 |
JPH05500017A (en) | 1993-01-14 |
FI920872A0 (en) | 1992-02-27 |
AU637825B2 (en) | 1993-06-10 |
KR920703153A (en) | 1992-12-17 |
HUT64244A (en) | 1993-12-28 |
EP0489815A1 (en) | 1992-06-17 |
GB8919825D0 (en) | 1989-10-18 |
CA2065300A1 (en) | 1991-03-02 |
AU6345090A (en) | 1991-04-08 |
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