HUT64244A - Safety helmet - Google Patents

Abstract

The present invention relates to a safety helmet (11) capable of being used with or without a breathing apparatus. In one embodiment a "total" safety helmet (11) with a see-through aperture (12) includes quick-release devices arranged to selectively clamp one or the other of two rigid closed frame assemblies (27) within the helmet (11). Each of assemblies (27) includes a flexible annular seal (26) having one circumferential end secured to the frame (27) and the other end intended to contact the wearer's face. When one of said assemblies (27) is clamped in the helmet (11) the volume forward of the wearer's face is exposed to atmosphere through the open see-through aperture (12). When the other of said assemblies (27) is clamped in the helmet (11) a see-through panel (24) closes the aperture (12) through the helmet (11) and valves and air ducts, supported by said frame (27), supply breathable air to the volume defined within the annular seal (26).

Description

The safety helmet according to the invention may be used with or without a respirator.

In one embodiment, a full safety headgear (11) comprises a transparent, transparent opening (12) and has quick release devices for fastening one or the other rigid closed frame (27) to the headgear portion (11).

Each frame (27) comprises a flexible annular seal (26) with one peripheral edge attached to the frame (27) and the other edge being in contact with the face of the wearer.

When one of the frames (27) is attached to the headgear portion (11), the volume in front of the face of the wearer of the helmet is in contact with the atmosphere through the open, transparent or transparent opening (12).

·· • · ···· • ··· «44 · • ··· • ^ 9 ··· 999

However, when the other frame / 27 / is attached to the head guard part / 11 /, the transparent plate / 24 / closes its arrow / 12 / which passes through the head guard part / 11 / but is provided by the valves and air ducts carried by the frame / 27 / inhalation! air to the volume defined within the O-ring / 26 /.

yjd / 1. figure/

·· · ··· * ·· · ·

Q 1 / c 55 919 / o0 • · · · · · ··· · · · · · · · · · · · · · · S.B.G. & K. λ / Q / / t Budapest International R / 1 / ll 4 Patent Office Π1 * ' • 't Budapest, Dalszínház u. 10. ' ^ 3-3733, Fax: 153-3664 PUBLICATION LITERATURE / üfio _s -

Safety helmet

ARAN FIRE & SAFETX / Ut / LIMITED, SCJNTHORPS, S. HUMB3RSIDB NAGX-BRITAIN

Inventor: Robert LOWRIE, SGUHTHORPK, S. HUMBERSIDE NAGX-BRITAIN

The Nomothic

International filing filing

International publication

priority:

day: number: number

28.08.1990.

POT / GB 90/01524 wo 91/05279 ______________

9/1/1989 /8919825.5/

MAGI BRITAIN

BACKGROUND OF THE INVENTION The present invention relates to a safety headgear, more particularly to a safety headgear which can be used in combination with a respirator and which completely surrounds the wearer's head while at the front, over the head. · • · · · · · ···· the····· · · ··

- Contains 2 visual or transparent apertures.

Virtually all conventional safety headgear is suitable for use with a conventional mask-type respirator, wherein the respirator is provided with a flexible mask held by a band or strap over the wearer's face and covering the wearer's head over and around. Said mask defines an inhalable volume in front of the breathing apertures of the wearer of the helmet, and further comprises a valve assembly for controlling the air supply to the mask. The air supply line is connected to the part of the mask which is located away from the face of the wearer and allows the wearer to quickly wear a conventional safety helmet with the breathing apparatus fitted.

The valve assembly of a conventional respirator is relatively large and, in the case of such a respirator, when required to provide protection in a hazardous environment, the mask extends to the upper part of the face of the helmet wearer and includes an opening closed by a transparent sheet. Due to the limited size of the mask, this transparent sheet is relatively small and limits the visibility of the helmet wearer.

The serious problem with the aforementioned headgear / conventional respirator combination is the fact that the headgear is completely independent of the respirator and that the headgear is unsuitable and uncomfortable to be worn on the breathing mask straps. In addition, the mask has a valve assembly and • ·

- the front portion of the air supply conduit extending forward beyond the rim of the headgear, thus providing only a small amount of protection for these aforementioned frontal parts of the breathing apparatus.

Furthermore, because the mask is essentially flexible, the forward connection of the valve assembly and the air in the mask is sensitive to displacement, especially in low vision and congested conditions, and if this connection is displaced, the dangerous atmosphere may causes.

In recent years, u.n. They recommend total 'or full headgear which includes a respirator and which protects the wearer's entire head down to the neck level.

Such headgear is generally made of plastic and has a comfortable opening, which is closed by a transparent sheet and has a flexible seal which is located inside the helmet from the circumference of the transparent sheet and forms a seal on the face of the wearer. Thus, the entire face of the wearer of the helmet is open toward a closed volume defined by the seal, the transparent sheet, and the face of the wearer. The valve assembly · which is often connected externally to the headgear, the inhalation atmospheric conduit leading to said volume, and some such helmets even have an exhalation valve which passes through the transparent sheet and can thus expose the spent air ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

- 4 gazes.

An inherent disadvantage of prior art total headgear is that while the headgear is worn, the wearer is fully dependent on the supply of breathable air in a closed volume, and if the air supply is a container or container carried by the wearer of the helmet, headgear is worn, strictly limited. Furthermore, since the helmet must be fitted before the wearer enters the hazardous environment and must not be removed until the wearer leaves this hazardous environment, the actual time that the helmet wearer may be exposed to the hazardous environmental effects , yes, it was customized.

A further disadvantage of the known headgear and the associated respirators is that they are extremely expensive ·

For many rescue and / or firefighting applications, some personnel may have operating areas that do not contain a hazardous atmosphere and therefore do not require a respirator · Personnel operating in other operating areas are expected to enter the hazardous environment and in these cases breathing apparatus. they need. For many rescue operations, and especially for firefighting, the environmental conditions in which the staff must operate cannot be determined before they arrive on site.

The present invention relates to safety headgear-

creates a chess that can be used with or without a respirator.

The object of the present invention is achieved by providing a safety head protection helmet which completely surrounds the wearer's head and has a transparent or transparent opening at the front, characterized by a rigid, closed frame which can be connected to the head protection helmet. and which is concentric with said transparent aperture, and further has an annular seal having one continuous end or edge sealingly engaged with the frame and having the other continuous end or edge facing the face of the wearer, through your face and through your sleeve, you finally have a quick release device for attaching your breathing apparatus to your helmet any way you like.

Preferably, the headgear comprises a strap consisting of straps which support the headgear on the wearer's head and a cushion pad that is attached to the back of the wearer's head.

The annular seal is preferably resilient and the straps of the strap are adjustable to allow the padding to move from the front to the rear so that it can be adjusted relative to said annular seal.

In one embodiment, the transparent aperture in the helmet shell is completely closed by a transparent sheet. ·•••••••••••••••••••••••••••••••• ··· ·· · ♦

- With 6 help.

In another embodiment, the transverse sheet carries an exhalation valve.

In a further preferred embodiment, a nose cone extends from said transparent sheet to engage the face of the helmet wearer through a continuous seal that surrounds the respiratory tract of the helmet wearer. This exhalation valve is arranged to draw air from a volume defined by said nose cone and the nose cone is provided with such a valve. fitted to provide airflow to this nose cone, in a volume determined by the ring seal, the transparent sheet and the face of the person wearing the helmet.

The safety helmet may preferably be used in combination with a valve assembly and air ducts, which are arranged to supply pressurized air from a source of air outside the helmet to the volume in front of the face of the helmet wearer by the ring seal, transparent sheet and helmet ring gasket will surround.

The rigid, closed frame is preferably releasably secured to the helmet shell by means of a quick release device.

In one embodiment, the transparent plate and valve assembly »and the air ducts are releasably secured to a rigid closed frame.

In one preferred embodiment, the headgear includes a hub inner cavity below the orifice, said valve assembly, and the air ducts engage with the lower portion of the rigid closed gasket and are housed in said inner cavity when the rigid, closed frame is thereon. mounted on the helmet shell.

In a further embodiment, the rigid closed frame may be released from the helmet shell by release of the quick release device and the frame may be replaced by a second rigid closed frame having an annular seal extending to the face of the helmet wearer; towards the ambient atmosphere.

In the embodiment, said second rigid closed frame is releasably secured within said headgear by said quick release devices, and said annular seal is connected to said second rigid closed frame, which is removable therewith.

The quick release device preferably includes rotatable devices adjacent to the helmet opening and is arranged such that, in one pivoting position, these means securely engage the rigid closed frame with the helmet shell, while in the other pivoting position, these means release the rigid, closed frame helmet.

In yet another embodiment, the headgear is characterized in that a conduit connects the volume defined by the ring seal to the atmosphere surrounding the helmet.

Preferably, said conduit is flexible

contains a connection between the volume inside the O-ring and the opening through the helmet.

In one preferred embodiment, this duct is optionally sealed by the air supply device.

Preferably, this air supply structure or assembly comprises an air supply valve assembly housed in a housing and an air supply from the air reservoir to said air supply valve assembly, wherein the quick release means comprises a means for selectively connecting or separating the air outlet air duct.

Finally, in a preferred embodiment, the quick release device comprises cooperating interrupted threads that are present in the housing and in the conduit.

The invention will now be described in more detail with reference to an exemplary embodiment thereof, with reference to the accompanying drawings, in which:

Figure 1 is a cross-sectional view of the safety helmet with a connection to a respirator;

Figure 2 is a sketch of the front, underside of the mask, with the respirator inside;

Fig. 5 is a sectional view taken along the same plane as Fig. 1 showing the open helmet attachment of the safety helmet shown in Fig. 1;

- Figure 4 illustrates a fast chopper according to the invention ························································································································································ · · · · · · ·

- illustrates the floor plan of 9 devices;

Figure 5 is a side view of the quick release device shown in Figure 4 ·;

Fig. 6 is a bottom view of the quick release device of Figs. 4 and 5;

7 is a view from one end of the quick release device of FIGS. 4, 5 and 6;

Fig. 8 is a perspective view of a portion of a rigid closed frame and a circular seal with a one-piece latch that can be locked by a quick release device;

Fig. 9 is a side view of the lower, front part of the safety helmet, which includes a device for selectively attaching the respirator to the helmet;

Figure 10 is a sectional view taken along the line II-II in Figure 9 · from the left side of the helmet;

Figure 11 is a side elevational view of a breathing apparatus for use with the helmet of Figures 9 and 10; finally

Figure 12 is a side view of the respiratory attachment device, viewed in the direction of arrow A;

Turning to the aphids, the safety headgear shown on Feb. 1 has a conventional headgear portion 11, which is made of plastic and is usually molded and has an opening 12 at the front. The 11 headgear in the If area is made of thick material around the neck opening, such as its safety rim, hem • ·· ♦

- 10 Commissioners.

The safety helmet 11 has an inner headband comprising an upper cushion 13 supported on both sides by elastic straps 14, each strap 14 passing through a slot in a base plate 15. The base plate 15 is fastened by a screw 16, which is pressed into the groove of the headgear, not shown.

The 13 pads come into contact with the head of the helmet wearer, thus keeping the upper part of the helmet away from the wearer's head ·

The inner headband also includes a rear cushion that pivots at its upper portion to the rear of the cushion 13, supported by an elastic band 18 on each side that runs through a slit in the base plate 19 while the base plate is pressed into the headgear shell - not fastened - by means of screws 20 connected to a groove.

Preferably, the lower portion 17a of the cushion 17 is proximal to and close to the neck opening of the headgear 11 so that the wearer can manually move the lower portion 17a of the cushion 17 toward the rear of the headgear 11, thereby assisting in removing and removing.

The cushion 17 further comprises ribbons 21 attached to one side of the cushion 17 at its lowest portion, each rib 21 having a series of tongue-and-groove openings 21a, 21b, 21c, 21d, 21e which may optionally be connected to - a cooperating part of an anchor pin; this anchor pin is secured to the head guard part 11, in the case of the present example in the vicinity of the anchor opening 21b.

The helmet 11 has a visor 23 which is made of transparent material and is attached to the helmet shell, just above the nylon 12, extending downwardly, closes the aperture 12 and slightly protrudes from the head protection 11 to deflect the small falling solid and liquid particles 12 arrows.

In the example shown in Fig. 1, the head protection helmet is provided with a respirator connection comprising a transparent 24 sheet; this closes the aperture 12 and is provided with a resilient sealing member 25 which is disposed between the circumferential portion of the transparent sheet 24 and the surface of the headgear near the aperture 12. The annular seal 26 has a continuous or radial end portion 26a which is inclined outwardly and contacts the peripheral portion of the inner surface of the transparent sheet 24. The assembly is supported by a rigid closed frame 27 · The elements 24, 25 »26 and 27 are concentric with the opening 12 and preferably the elements 25 * 24, 26a and 27 are joined together, for example by gluing, form a single assembly *

As shown in Figure 1, * the lower front section * of the head guard part 11, i.e., the part below the opening 12, is configured to have an enlarged inner · · · · · · «·· ··· · ♦♦ · ♦ ··

Forming a cavity 12, generally referred to as IIb, and the closed frame 27 including a projection 27a extending into said cavity and carrying a respiratory flow regulator valve assembly 28, the valve assembly 28 being provided on line 29 through compressed air, where line 29 from valve assembly 28 to helmet neck! It passes through its arrow, usually at one side of the cervical arrow, and leads to a compressed air container (not shown), which may, for example, be cylindrical and may be carried by the wearer of the helmet 11 as a backpack.

The valve assembly 28 includes a cable 50 by feel which _is closed through the frame 27 and the ring packing 26, so that eventually open-atmosphere within the annular seal 26. The sensor line 3θ opens into the manifold 51, which in turn flows into the sensor hole in the valve assembly 28, whereby when the sensor line 30 senses a pressure under a predetermined pressure, the valve assembly 28 supplies open air flow from the tube 29 to the sensor. 28 through valve assembly 28 to manifold 32, from which air flows through outlet 35 to volume within bore of O-ring 26.

The valve assembly 28 may include a manual over-regulator, labeled 34 overall! it can be operated manually by the wearer of the helmet, or by another person nearby by inserting a finger into the neck opening of the helmet with the 34 over-adjusting buttons · · · · · · · · · · · · · ··· »» ··· • · · · · · · · · · · · · · · · · · · ·

- to press 13, thereby allowing airflow to enter the volume of the annular gasket 26 if breathing difficulties were experienced by the wearer of the helmet.

The breathing apparatus further comprises an exhalation valve 33 which passes through the transparent sheet 24 and carries at its inner end a nose cone 36 comprising two one-way valves 37 on each side. The nose cone 36 is adjustable forward and backward by means of adjusting devices, which are well known in the art, and which means are included in the exhalation valve 33.

THE 2? The enclosed frame further comprises, in the vicinity of the two opposite sides, a recess 2c provided with an indentation 27c. 8b in one circumference around the circumferential edge, as illustrated in FIG.

The sealing member 23, the transparent sheet 24, the ring gasket 26, the valve assembly 28, the manifolds 31 and 32, and the wires 30, 33 and 29 are all supported by a rigid closed frame 27 and all the element forming a detachable assembly from the main wire 11.

A quick release device suitable for attaching a rigid closed frame 27 as well as underframe mountings to a headgear such as this one.

Referring to Figures 1 and 2, Figures 4, 3 ·, 6 · and 7 show where this quick release device has a solid body, generally designated 4ű, through which 41 apertures pass through the 40 bodies

it is rotatably connected to the headgear by means of a pin 42, which is secured to a groove (not shown) embedded in the headgear 11. The aperture 41 is provided with a recess 41a for receiving the bolt head 42.

The body 40 is provided with a cylindrical member 43 at its end portions distal to the opening 41 and having an axis parallel to the axis 41 of the opening, and a projection 44 of your roof covering over the cylindrical member 43 extending radially and extending beyond the cylindrical member.

If two such quick release devices 40 to 44 are mounted on the headgear 11 by pin bolts 42 fastened to respective grooves at the adjacent edge of the opening 12, these quick release devices can be rotated around their respective pin bolts 42.

If you have a rigid 27 closed frame as well

24, 25, 26, and 2Ö-37 elementary breathing apparatus, the 4044 gyors gyors 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40, Following this, the respirator consisting of the elements 24-37 can be inserted into the head protection part 11 and pressed by the flexible sealing member 23 at the head protection surface surrounding the opening 12. Then, the 40-44 battery shortcuts are rotated so that ♦ · ········································•

The roof members 15 have their projecting portions 44 connected over the free side 27d of the adjacent flange 27b and the cylindrical members 43 of each of the quick release devices 40-44 engaging with the recess 27c in the adjacent tab 27b.

The quick release devices consisting of the elements 40-44 are compressed in engagement with the corresponding recesses 27c in the closed frame 27 and thus due to the compression connection around their side edges, the closed frame 27 compresses the sealing element 25 between the helmet surface and the transparent sheet 24. a seal is formed between the openings 12 and the environment.

The 24-37 marks! To remove the respirator consisting of parts, it is only necessary to rotate the quick release device from its adjacent tabs 27b, after which the respirator is already released from the locked engagement with the head protection part 11 and can be rapidly removed through the neck opening of the head protection part.

When using the headgear 11 in combination with the respirator consisting of the elements 24-37, it is only necessary for the user to release the straps 21 from the respective pin stud fastener, then manually move the rear padding 17 towards the back of the headgear and can be recorded. The wearer of the helmet holds the rear cushion 17 backward until the free edge environment of the gasket 26 can be comfortably sealed in a vi * * «··· ··

- 16 - the back pad 17 may be released to move forward again under the action of the elastic ld straps. The wearer of the headgear may then make the final adjustment of the headgear assembly 11 so that the headgear 11 is held back by the head 1 with the back of the head 1? This provides a comfortable sealing connection to the gasket 26 and then secures the headgear by pulling the straps 21 forward and securing the corresponding pin anchorage to one of the pin anchoring openings 21a-21c.

While the headgear is firmly but comfortably touched by the wearer, the 26-ring seal is sealingly in contact with the wearer's face, forehead, face-down and bottom, such as the 24-sheet, 26-ring seal, and the volume determined by the wearer's face, hereinafter referred to as the first volume, is continuously sensed by the $ 0 sensing line. When this sensing conduit 30 detects a pressure drop in said first volume, below a predetermined pressure, preferably slightly above atmospheric pressure, the valve assembly 26 is actuated and supplies air through the manifold 32 and the outlet 33. mentioned in the first volume. However, if the pressure in the first volume rises above said predetermined pressure, this increased pressure is sensed by the sensor line 30 and terminates the air supply to the valve 2Ö. «· · ··· • · · · · · through the assembly.

The airway of the wearer of the helmet extends into the volume within the nasal cone 36, hereinafter referred to as the "second volume", and the inhaled air flows from the first volume to the second volume through the one-way valves 37, while exhaling the one-way valves 37 aspirate from the second volume through the exhalation valve 35.

All you need to do to remove the helmet is to release the straps 21, push the back pad 17 towards the back of the hood using your fingers, or simply push the helmet forward on the head by bending the back strap 17 backwards, separating the face from the sealing contact with the ring gasket 26, whereupon the helmet can be quickly removed.

Fig. 3 illustrates a connection variant for the headgear 11 when the breathing apparatus 24-37 is removed from the headgear 11.

The coupling shown in Fig. 3 includes a resilient sealing member 51 for contacting the inner surface of the headgear 11 surrounding the arrow 12, further comprising an annular seal 52 which may be identical to the annular seal 26 shown in Fig. 1. has an outwardly facing flange 52a contacting the 51 sealantexaxam, except that ···· ··· * · «·· ··

The lamina 18 is provided with a rigid closed frame 53 which is identical to the rigid closed frame 27 and has tabs 53b which in turn are formed identical to the tabs 27b of the closed frame 27 shown in FIG. The sealing member 51, the flange portion 52a of the annular seal 52 and the closed frame 53 are joined together by a suitable adhesive to form a composite assembly.

The connection of the parts 51-33 is attached to the headgear in the same way as the breathing apparatus 24-57, where the sealing element 51 is placed on the inner surface of the headgear part 11 surrounding the arrow 12 and the quick release devices consisting of the elements 40-44 rotating until each of the roof-like projections 44 engages with the free surface 57d of the attached tab 53a while the cylindrical member 45 is disposed in the recess 55c of the adjacent grass 55b.

It will be noted that in the accessory of the members 51-55, the sealing member 51 is at least as thick as the combined thickness of the sheet 24 and the sealing member 25 in the embodiment of Fig. 1 so that the top projections 44 of the quick release device are pressed together and the cylindrical members 45 are compressed in relation to their respective recesses 55c, whereby the rigid closed frame 55 compresses the resilient sealing member 51, thereby securely holding the accessory 51-55 to the headgear 11.

«· 4 · · · · · · · · · · · · · · · · · · · · ···

By attaching the accessory consisting of elements 51-53 to the inside of the head guard part 11, the head guard latch 11 can be mounted in the same manner as described above with reference to Figures 1 and 2, wherein the free edge of the O-ring 52 is sealed on the face of the wearer of the helmet, as described in the embodiment of Figure 1, but in this case the volume in front of the face of the wearer of the helmet is exposed to the open atmosphere within the ring seal 52.

Thus, the annular seal 52 is at the rear 1? the padded cushion together puts the head of the helmet wearer firmly, from the rear towards the headgear, thus providing the highest degree of protection for the head of the helmet wearer.

The headgear helmet arrangement described above, in combination with a breathing apparatus consisting of 24-37 elements and a variable 51-53 accessory, is available and is particularly advantageous in the fire service where all firefighters can mount the 24- A 37-piece respirator on the headgear and connect the air supply line 29 to a backpack-worn air storage container.

Upon arrival at the scene, the staff who are required to work in a hazardous or potentially hazardous environment simply puts on their headgear, puts on said backpack, and is ready to take action.

* · Λ «« «« «« «« «« «♦ ♦ ♦

In the case of non-hazardous, risky environments, or for dedicated personnel who do not have to operate in a hazardous environment, it is very easy to disassemble the 24-37 Breathing Apparatus and the 51-53 Accessory fitting the helmet and the firefighter can leave the firefighting vehicle, leaving the backpack with the breathing apparatus of 24-37 attached to it.

In the embodiment shown in Fig. 9 ·, the head guard 51 is substantially the same as the head guard 11 shown in Fig. 1, except that the transparent sheet 24, annular seal 26 and rigid closed frame 27 are permanently attached to the head guard 11 and head guard. includes an opening 52 near the left edge of the transparent 24 sheet.

The sleeve 52 is provided with a sleeve 53 which has a cylindrical section 54 around one end and further has a radially extending flange 55 and a threaded portion 56 of the flange 55 opposite to the 5 * cylindrical section.

The sleeve 53 has a through hole 57 in which an interrupted thread 58 is located around the end of the hole 57 which is radially aligned with the threaded portion 56.

The bushing 53 is fastened to the arrow 52 by pushing the threaded portion 56 through the opening 52 from the inside of the head guard so that · 0 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · or is connected to the 56 threaded part.

The nut 52 is firmly secured to the threaded portion 56, whereby the shell-like head guard portion 51 surrounding the aperture 52 is securely clamped between the flange 55 and the nut 59 and thus the sleeve 53 is held firm against rotation.

A flexible tubular member 60 includes a cylindrical section 61 into which a cylindrical section 54 of the sleeve 53 extends and is secured there, for example by gluing or by means of a clamp surrounding the cylindrical section 61. The middle portion 62 of the tubular member 60 is accordion-shaped while the end portion 63 distal from the cylindrical portion 61 is cylindrical and includes a radial flange 64 at its outer end. The flange 64 and the end portion 63 extend through the aperture 65 in the annular seal 26 and the annular rim 64 is connected to the annular seal 26 in a manner that provides a gas tight seal.

It can thus be seen that, in the embodiment described above, the volume determined by the ring seal, the transparent sheet and the face of the wearer is in open communication with the ambient atmosphere through the open bore of the tubular member 60 and the bore 57 in the sleeve.

The respirator attachment to the headgear is provided with a valve body 70 which is generally cylindrical and has a concentric protrusion 71.

4> «· 4 * 44« 4 · 4 ·· «· · · · · · · · · · · · · · · · · · · · · · · · · ···

The protrusion 71 is provided with an interrupted screw thread marked 72 and a line 75 from an air supply source (not shown) which leads to the valve housing 70.

The external diameter of the threaded elements 72 is such that a protrusion 71 other than the line of the threaded elements 58 and 72 may penetrate the through hole 57 of the sleeve 55.

The valve body 70 includes a valve for a conventional respirator, arranged to deliver air to a volume defined by the ring seal 26, the transparent sheet and the face of the wearer through the through hole 57 in the sleeve 55 and through the bore in the tubular member 60, when the pressure in the volume falls below a predetermined level.

Such respiratory delivery valves are well known in the art, and in many forms, so no detailed description of the operation of this valve arrangement is required here.

The valve arrangement may also include a manually operated bypass button 75 arranged to bypass the valve and thereby direct air through the valve arrangement when required.

To install the housing 70-71 with its internal valve arrangement, it is only necessary to insert the protrusion 71 into the through hole 57 of the sleeve 55 by means of the unbroken threaded screws 58 and 72 and then rotate the housing 70-71. ··· 4 · · · · · * · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · which results in the housing of the 70-71 batteries being secured to the headgear.

The radial end face of the valve body 70 has an elastic collar 74 that protrudes the a / 1 protrusion, which seal is pressed between the nut 59 and the radial face end of the valve body 70 when the housing 70-71 engages with the sleeve 55.

The radial position of the sleeve 55 is selected such that when the housing of elements 70-71 engages with the sleeve 55, the conduit 75 is in its natural, non-tensioned position and reaches the air storage container without the circumference of the conduit 75 The housing 70-71 is directed toward an unlocked position or in the direction of an overlocked position, but optionally the housing 70-71 may include a ratchet mechanism (not shown) that may engage the sleeve 55, nut 59, or head guard 51 to keep the 70-71 sign home in locked position with headgear in use.

It will now be appreciated that when the housing of elements 70-71 is disconnected from the head portion 51, its wearer inhales atmospheric air through the bore 57 and the bore of the tubular member 60. If a respirator is desired, only the • ·

- 24 needed to make 71 protrusions; insert it into the through hole 57, rotate the housing 70-71 by ninety degrees to lock this housing through the through hole 57, the bore of the tubular member 60, and the volume in front of the face of the wearer of the helmet 26 ring and transparent sheet 21 It is insulated with its ambient atmospheres, while the helmet wearer can be supplied with air through the conduit 75 and the housing 70- / 1.

To uncouple the respirator, all you need to do is release the handle assembly that holds the housing 70-71 connected to the helmet, rotate said housing ninety degrees and then detach the housing from the headgear 51, reconnecting the helmet wearer's face with the ambient atmosphere.

Claims (18)

Claims A safety headgear which completely surrounds the wearer's head and has a transparent arrow at the front, characterized by a rigid closed frame which can be connected to the inside of the headgear and which is concentric with said transparent opening, and further has an annular seal which one continuous end is sealed in relation to the frame and concentric thereto, while the other continuous end is arranged to engage the wearer's face through the forehead down the cheeks and chin, and finally is provided with a quick release means for selecting a respirator for the bow helmet Connector price. A safety headgear according to claim 1, characterized in that the headgear portion comprises a strap which is provided with a cushion pad that is attached to the wearer's head and to the rear part of the wearer's head. A safety headgear according to claim 2, characterized in that the annular seal is made of a resilient material and that said straps of the strap are adjusted to make the padding from the front to the rear relative to said annular seal. 4. A safety headgear according to any one of the preceding claims, characterized in that the headgear shell is transparent. - 26 arrowheads are completely sealed with a transparent sheet. The safety headgear according to claim 4, characterized in that the transparent sheet carries an exhalation valve. A safety headgear according to claim 5, characterized in that there is a nose cone protruding from the transparent sheet that contacts the face of the wearer of the helmet, and that a continuous seal surrounds the respiratory ducts of the helmet wearer while the exhalation valve is arranged aspirate from a predetermined volume, and the nose cone includes a valve to provide airflow to the nasal cone from a volume defined by the ring seal, the transparent sheet, and the face of the wearer. 7. A safety headgear according to any one of claims 1 to 3, characterized in that it is provided with a combination of a valve and air ducts for transporting pressurized air from an air reservoir outside the helmet to a volume in front of the face of the helmet wearer. is defined by its face, which is delimited by said annular seal. 8. A safety headgear according to any one of claims 1 to 3, characterized in that the rigid, closed frame is removably secured to the headgear shell by a quick release device. The safety head according to claim 8, characterized in that the annular seal is provided with a safety helmet. the transparent sheet, said valve, and the air ducts are carried by the rigid, closed frame and are removable therewith. The safety headgear according to claim 9, characterized in that the head protection part comprises an inner cavity below the opening, and that the valve and the air ducts are connected to the lower part of the rigid closed frame and are located in said inner cavity when , closed frame is assembled with the helmet shell. A safety headgear according to any one of claims 8 to 10, characterized in that the rigid, closed frame can be detached from the headgear by releasing the quick release mechanism, and that the frame is replaced by a second rigid, closed frame that engages the helmet wearer's face. carries a gasket where the volume defined by this annular gasket is half open. The safety headgear according to claim 11, characterized in that said second rigid closed frame is removably secured within said helmet by means of said quick release devices and said annular seal is connected to and removable with the second rigid closed frame. . 13. A 8, -12. A safety headgear according to any one of claims 1 to 5, characterized in that: · ···· because the quick release devices contain rotatable devices near the opening passing through the headgear and securely attach said rigid, closed frame to the headgear in one rotated position and the rigid, closed frame to unlock in the other rotated position. from safety headgear. 14. A safety headgear according to any one of claims 1 to 4, characterized in that it has a conduit which connects the volume defined by the annular seal to the atmosphere outside the helmet. The safety headgear according to claim 14, wherein the conduit has a flexible connection between the volume inside the annular seal and the opening through the helmet. 16. Safety headgear according to claim 14 or 15, characterized in that the duct is optionally coupled to an air supply device. A safety headgear according to claim 16, characterized in that said air supply device comprises an air supply valve assembly housed in a housing, and an air supply from the air reservoir to said air supply valve assembly, and - 29 quick release devices include means for connecting or disconnecting a door to door air outlet selection series. A safety headgear according to claim 17, characterized in that the quick release device comprises cooperating interrupted threads which are contained in said housing and conduit.