Protective goggles and respirator

Abstract

The invention provides protective goggles comprising a frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; and a visor connected to the frame. An air flow source is configured to generate an air flow into an ocular space defined by the protective goggles. The protective goggles further comprise a filter configured to filter air in the air flow generated by the air flow source, wherein the filter is mounted in a brow portion of the frame.

Description

[0001] PROTECTIVE GOGGLES AND RESPIRATOR

[0002] Field of the Invention

[0003] The present invention relates to protective goggles for protecting eyes of a wearer. The protective goggles include an air flow source for generating an air flow into an ocular space defined by the protective goggles. The present invention also relates to protective goggles and a mask for use in a modular respirator.

[0004] Background

[0005] A respirator mask is a device that is used to protect a wearer from dangerous materials or substances, for example chemical, biological, nuclear and radiological agents, and / or toxic industrial chemicals, and / or toxic industrial materials.

[0006] A respirator mask typically includes a nose cup that covers at least the nose and mouth of the user and provides a seal around the nose and mouth. The nose cup is provided either with a filter for filtering air inhaled into the nose cup by the user, or with a connector for connecting the nose cup to a supply of filtered air. The nose cup is also typically provided with an exhale valve through which exhaled air can be discharged from the nose cup. A respirator mask also typically includes a visor or goggles portion that covers the eyes of the user and protects the eyes of the user. The visor or goggles portion typically provides a seal around the eyes of the user.

[0007] The present invention has been devised in light of the above considerations.

[0008] Summary of the Invention

[0009] In general terms, the invention provides protective goggles for protecting a wearer’s eyes from dangerous materials or substances in the environment. For example, the protective goggles may be used as part of chemical, biological, radiological and nuclear (CBRN) protective equipment. The protective goggles can be combined with a mask, to provide a modular respirator. The protective goggles include a frame, a visor connected to the frame, and a sealing arrangement configured to form a seal between the frame and a face of the wearer. The protective goggles further include an air flow source which is configured to generate an air flow into an ocular spaced defined by the protective goggles. The air flow source can provide two functions. In particular, the air flow into the ocular space can cause a positive pressure (i.e. a pressure higher than atmospheric pressure) inside the ocular space, to assist in preventing contaminants from entering the ocular space. This can enhance a safety of the wearer, particularly in the context of CBRN defence. Additionally or alternatively, the generated air flow can serve to defog the visor, i.e. prevent or reduce condensation on the visor thereby improving visibility through the visor. This can facilitate wearing of the protective goggles for extended periods of time.

[0010] The invention includes the various aspects of the protective goggles set out below.

[0011] In a first aspect of the invention, there is provided protective goggles comprising: a frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a visor connected to the frame; an air flow source configured to generate an air flow into an ocular space defined by the protective goggles; and a filter configured to filter air in the air flow generated by the air flow source, wherein the filter is mounted in a brow portion of the frame.

[0012] In this manner, the filter is directly integrated into the brow portion of the frame. This contributes to making the protective goggles more compact and easier to use. For example, there may be no need to connect the protective goggles to an external filter or clean air source. Advantageously, providing the filter in the brow portion allows the filter to be integrated into the frame without significantly increasing a size of the protective goggles and without occluding the wearer’s vision. In particular, the brow portion of the frame provides a relatively wide region above the wearer’s eyes where the filter can be accommodated, enabling effective filtering of the air flowing into the ocular space to be achieved whilst making efficient use of space in the frame. Accordingly, the protective goggles can provide a completely integrated and self-contained solution for generating an air flow into the ocular space to enhance protection of the wearer’s eyes.

[0013] The filter is configured to filter air in the air flow generated by the air flow source. Thus, air entering the ocular space is filtered, such that it may be substantially free of contaminants. The filter may comprise a filter medium which is configured to remove contaminants from the air flow.

[0014] The air flow source may be configured to draw air through the filter, in order to generate the air flow. In other words, the filter may be arranged upstream of the air flow source (e.g. fan or pump). The filter in the brow portion of the frame may thus act as an air intake for the air flow source. In this manner, the air flow into the ocular space is filtered.

[0015] An air flow path for the air flow generated by the air flow source may be defined in the protective goggles. In particular, the air flow path may pass through the ocular space, and extend between an air inlet (or air intake) and an air outlet of the protective goggles.

[0016] The air flow source may comprise an inlet which is in fluid communication with an outlet of the filter, such that the air flow source is arranged to draw air through the filter. The air flow source may further comprise an outlet in fluid communication with the ocular space, to direct the air flow into the ocular space. In this manner, the air flow passes through the filter and the air flow source prior entering the ocular space. For example, the inlet of the air flow source may be in fluid communication with the outlet of the filter via an airtight channel. This ensures effective filtering of the air flow, and allows accurate control of the air flow rate into the ocular space.

[0017] Herein, the brow portion of the frame may correspond to a portion of the frame which is arranged to extend over (above) the wearer’s eyes, when in use. For example, the brow portion may be arranged against the wearer’s forehead in use. The brow portion may extend between a left-hand side wing of the frame and a right-hand side wing of the frame. The brow portion may be curved, e.g. to conform to a curvature of the wearer’s forehead.

[0018] The frame may act as a support or holder for the visor. For example, the frame may be arranged to surround the visor. The visor may be mounted in the frame, e.g. the visor may be retained in the frame via a push-fit or interference connection between the frame and the visor. The frame may comprise a channel for receiving the visor. The visor may be formed of a transparent or semi-transparent material, so that the wearer can see through the visor. The visor may also be referred to as an eyepiece. The frame is arranged to hold the visor in front of the wearer’s eyes, in use.

[0019] The visor may comprise one or more engagement features at an edge of the visor, for engaging corresponding features in the channel in the frame. This may serve to strengthen a connection between the visor and the frame. For example, the one or more engagement features on the visor may be configured to interlock with the engagement features in the channel. The one or more engagement features on the visor may comprise one or more tabs.

[0020] The sealing arrangement is configured to provide a substantially airtight seal with the wearer’s face. The sealing arrangement may comprise a sealing surface which is configured to contact the wearer’s face (skin), to form a seal with the wearer’s face. The sealing arrangement may extend around an edge of the frame, so as to form a continuous seal around the wearer’s eyes. In other words, the sealing arrangement may extend around an edge (periphery) of the ocular space defined by the protective goggles. For example, the sealing arrangement may comprise a continuous sealing strip (which provides the sealing surface) which extends around an edge of the frame.

[0021] The sealing arrangement may be configured to conform to a shape of the wearer’s face, to allow effective sealing with the wearer’s face. Thus, the material of the frame and sealing arrangement may be a highly flexible material.

[0022] The air flow source may comprise any suitable device or apparatus suitable for generating an air flow into the ocular spaced of the protective goggles. For example, the air flow source may comprise a fan or a pump configured to cause air to flow into the ocular space. The air flow source may be in fluid communication with the ocular space (e.g. via a passageway or channel in the frame), so that it can cause air to flow into the ocular space. As an example, the air flow source may be configured to generate an air flow rate of 0.5 litres per minute (Ipm) or more, e.g. around 1 Ipm. In some cases, the air flow rate into the ocular space may be between about 1 to 8 Ipm. This can facilitate maintaining a positive pressure inside the ocular space, as well as avoid build-up of moisture in the ocular space so as to prevent visor fogging.

[0023] The air flow source may be integrated into the frame, as discussed in more detail below. Alternatively, the air flow source may be connected to the frame via an air flow passage, e.g. a tube of the like.

[0024] The air flow generated by the air flow source may generate a positive pressure in the ocular space. This may serve to prevent contaminants from entering the ocular space, e.g. via any gap between the sealing arrangement and the wearer’s face.

[0025] Additionally or alternatively, the air flow generated by the air flow source may serve to defog the visor. For example, the air flow can serve to remove condensation from an inner surface of the visor, and / or to remove moisture from the ocular space.

[0026] Here, the ocular space defined by the protective goggles corresponds to an inner spaced defined by inner surfaces of the visor, the frame, and the sealing arrangement. In use, the ocular space is located between the inner surface of the visor and the wearer’s eyes, and constitutes a volume which is enclosed by the protective goggles around the wearer’s eyes. The filter may extend along the brow portion of the frame from a first side wing portion of the frame to a second side wing portion of the frame. The first side portion may be the left-hand side wing of the frame, and the second side wing portion may be the right-hand side wing of the frame. In this manner, the filter may extend across most or all of a width of the brow portion of the frame. This can provide the filter with a large surface area, to provide a high filtering efficiency and allow higher flow rates to be achieved.

[0027] The air flow source may be located in the first side wing portion of the frame, and the filter may include a first outlet arranged at a first end of the filter adjacent the first side wing portion, the first outlet of the filter being in fluid communication with an inlet of the air flow source. In this manner, air can pass through the air filter, and from the first outlet of the filter to the air flow source and into the ocular space. Providing the first outlet of the filter adjacent the first side wing portion facilitates connecting the filter to the air flow source, and contributes to improving filtering efficiency. In particular, as the filter extends across the width of the brow portion, air can flow through the filter along at least part of a width of the brow portion before exiting the filter via the first filter outlet. Additionally, providing the air flow source in the first side wing portion and the filter outlet adjacent the first side wing portion enables the air flow path to be directly integrated with the frame, thus making the protective goggles more compact.

[0028] For example, as discussed further herein, the air flow source may be mounted in a cavity defined in the first side wing portion of the frame.

[0029] The first outlet of the filter may be in fluid communication with the inlet of the air flow source via a first (e g. airtight) air flow channel, e.g. to provide an airtight connection between the first outlet of the filter and the inlet of the air flow source. In this manner, all of the air flow exiting the first outlet of the filter passes into the inlet of the air flow source. The first air flow channel may be defined (formed) in the frame. The first air flow channel may extend within the frame between the inlet of the air flow source and the first outlet of the filter. Thus, the first air flow channel may be surrounded material of the frame, to provide the airtight connection between the first outlet of the filter and the inlet of the air flow source.

[0030] The protective goggles may further comprise a second air flow source located in the second side wing portion of the frame, the second air flow source being configured to generate an air flow into an ocular space defined by the protective goggles, wherein the filter includes a second outlet arranged at a second end of the filter adjacent the second side wing portion, and wherein the second outlet of the filter is in fluid communication with an inlet of the second air flow source. Thus, a respective air flow source can be located in each side wing portion of the frame, with the filter having a respective outlet arranged adjacent to each side wing portion of the frame. In this manner, air can flow into the filter and be split between the first outlet and the second outlet to form the air flows generated by the two air flow sources. The filter therefore acts as a common air intake for both air flow sources, and filters air in the air flow generated by both air flow sources. Such an arrangement contributes to making the protective goggles more compact, by using a single air intake and filter for both air flow sources. The second air flow source may be mounted in a second cavity defined in the second side wing portion of the frame.

[0031] In line with the discussion above, the second outlet of the filter may be in fluid communication with the inlet of the second air flow source via a second (e.g. airtight) air flow channel, e g. to provide an airtight connection between the second outlet of the filter and the inlet of the second air flow source. In this manner, all of the air flow exiting the second outlet of the filter passes into the inlet of the second air flow source. The second air flow channel may be defined (formed) in the frame. The second air flow channel may extend within the frame between the inlet of the second air flow source and the second outlet of the filter. Thus, the second air flow channel may be surrounded material of the frame, to provide the airtight connection between the second outlet of the filter and the inlet of the second air flow source.

[0032] The filter may comprise a first plurality of air inlets arranged between a central portion of the filter and the first end of the filter, wherein the first plurality of air inlets are arranged in order of increasing size from the first end to the central portion. Additionally alternatively, a frequency of the air inlets can be increased towards the central portion of the filter. Such an arrangement of air inlets can contribute improving filtering efficiency. In particular, providing larger air inlets and / or more air inlets towards the central portion means that more air will be drawn in to the filter around the central portion, such that the air has to flow a larger distance through the filter before reaching the first outlet. Additionally, this arrangement of air inlets serves to as well distribute air intake along the filter, which may enhance uniformity of air flow through the filter.

[0033] The filter may comprise a second plurality of air inlets arranged between the central potion of the filter and the second end of the filter, wherein the second plurality of air inlets are arranged in order of increasing size from the second end to the central portion. Additionally or alternatively, a frequency of the air inlets can be increased towards the central portion of the filter. Similarly to the above, the can contribute to improving filtering efficiency and distribution of air flow through the filter.

[0034] The first plurality of air inlets and / or the second plurality of inlets may be formed in an outer surface of the filter, e.g. in an outer surface of a cover or housing of the filter. The outer surface of the filter may correspond to an upper surface of the filter, e.g. which is arranged to face upwards in use. Thus, in use. air may be drawn into the filter from above the wearer’s face.

[0035] The filter may be removably mounted in a cavity defined in the brow portion of the frame. In this manner, the filter can easily be removed and replaced as needed. The cavity may have a shape that is complementary to the filter. For example, the cavity may be in the form of a groove or a channel that extends along the brow portion of the frame, e.g. between the first side wing portion and the second side wing portion of the frame. The cavity may be formed as part of a moulding process for making the frame.

[0036] The filter may be configured to engage the visor when the filter is mounted in the cavity. Engagement between the visor and the filter may serve to secure the filter to the visor, to thereby retain the filter in the cavity and / or ensure accurate location of the filter with respect to the visor. As described further herein, the visor may have a greater rigidity than the frame, e.g. the visor may be less flexible than the frame. Accordingly, engagement between the visor and the filter may provide a stronger connection between the filter and the protective goggles.

[0037] The filter may comprise an engagement portion that is configured to engage a corresponding (e.g. mating) engagement feature on the visor, e.g. to secure the filter to the visor. In some cases, a snap-fit connection may be formed between the engagement portion on the filter and the engagement feature on the visor. This may facilitate connecting the filter to, and disconnecting the filter from, the visor. In some cases, multiple engagement portions may be provided on the filter, with multiple corresponding engagement features being provided on the visor. The engagement feature on the visor may be at an upper edge of the visor. In this manner, the engagement feature on the visor may be located next to the cavity in the brow portion, to facilitate engagement of the filter with the visor.

[0038] As an example, a first one of the engagement portion on the filter and the engagement feature on the visor may comprise a protrusion (e g. projection), and a second one of the engagement portion and the engagement feature may comprise an opening (or groove) for receiving the protrusion.

[0039] A portion of the frame may be clamped between the visor and the filter when the filter is mounted in the cavity and the filter is engaged with the visor. In particular, the engagement between the filter and the visor may be arranged such that a portion of the frame located between the filter and the visor is clamped (e.g. compressed) therebetween. For example, a spacing between the filter and the visor may be adapted so that the portion of the frame is clamped between the two. This may ensure that the frame remains in place in the brow portion, and contributes to a tight fit between the visor and the frame in the brow portion.

[0040] The filter may be retained in the cavity by friction with the frame. In this manner, no further fasteners may be needed for securing the filter in the frame, thus simplifying an assembly of the protective goggles. For example, an inner surface (e.g. sidewall) of the cavity may engage a surface of the filter, resulting in the filter being retained in the cavity by friction between the surfaces.

[0041] The cavity may be shaped to form a push-fit or interference connection with the filter. For instance, the cavity may be arranged to stretch around the filter when the air flow source is inserted into the cavity, so as to hold the filter in place in the cavity. In some cases, an opening of the cavity may comprise a lip which is arranged to engage a surface of the filter, to retain the air flow source in the cavity.

[0042] Advantageously, elastomeric materials used for the frame may provide a relatively high coefficient of friction, enhancing the frame’s ability to retain the filter.

[0043] In some cases, the filter may be configured to fit onto an upper edge of the visor, such that a portion of the frame material is clamped between the visor and the filter when the filter is mounted in the cavity. This may ensure that the frame remains in place in the brow portion, and provides a tight fit between the visor and the frame in the brow portion.

[0044] The filter may be curved, to match a curvature of the brow portion of the frame. This may facilitate integrating the filter into the frame.

[0045] The filter may comprise a filter holder that contains a filter medium, the filter holder being mountable in the cavity. This may facilitate mounting the filter in the frame, as it avoids having to mount the filter medium directly in the cavity. Thus, the filter (including the filter holder and filter medium) and can be assembled separately from the rest of the protective goggles, and then inserted into the cavity in the frame to complete the protective goggles. The filter holder may correspond to a housing of the filter. The filter holder may be arranged to enclose the filter medium.

[0046] The filter medium may comprise any medium suitable for filtering an air flow. For example, the filter medium may comprise an activated carbon material. The activated carbon material may comprise an activated carbon cloth, fabric and / or foam. The filter medium may additionally or alternatively comprise a particulate filter material. For example, a high efficiency particular air (HEPA) filter or high efficiency synthetic particulate air filter can be used. Particulate filter materials can include, for example, non-woven glass fibre filter, PTFE, electrostatic melt blown material.

[0047] The filter holder may be formed of a material having a greater stiffness (or hardness) than a material of the frame. In line with the discussion above in relation to the first aspect of the invention, this may serve to reinforce the frame.

[0048] Where the filter is arranged to engage the visor, the engagement portion may be provided on the filter holder. Thus, for example, a portion of the frame may be clamped between the visor and the filter holder, both of which may be of a harder material than the frame.

[0049] The filter medium may be bonded to the filter holder. In this manner, the filter medium may be sealed to the filter holder. This may avoid leaks between the filter medium and the filter holder, to improve filtering efficiency. Advantageously, using a filter holder which is removably mountable in the frame avoids bonding or sealing the filter medium directly to the frame. Thus, using a separate filter holder enables the filter to be reliably sealed whilst facilitating removing of the filter from the frame.

[0050] In some cases, the filter medium may be overmoulded into a carrier frame, and subsequently bonded into the filter holder. This may facilitate, for example, pleating of the filter medium, which can provide lower air flow resistance and increased filtering efficiency.

[0051] A power source may be attached to the filter holder, the power source being configured to power the air flow source when the filter is mounted in the cavity. In this manner, the power source can be integrated as part of the removable filter. This may facilitate installing and removing the power source. For example, the filter and power source may be designed as a single replaceable part of the powered goggles. The power source may comprise a battery, e.g. a rechargeable battery or a disposable battery. The power source may be provided on a surface of the filter holder, or housed in a part of the filter holder.

[0052] The power source may be arranged such that it is electrically connected to the air flow source when the filter is mounted in the cavity. For example, electrical connectors may be provided in the cavity, the electrical connectors being arranged to electrically connect the power source to the air flow source when the filter is mounted in the cavity. Likewise, the power source may be configured to power a second air flow source and any other electronics in the protective goggles when the filter is mounted in the cavity.

[0053] The filter may comprise a tag, and the frame may comprise a tag reader configured to obtain information from the tag when the filter is mounted in the cavity. In this manner, information can be obtained from the tag when the filter is mounted in the cavity, which may facilitate or improve operation of the protective goggles. For example, information obtained from the tag could be used to verify authenticity of the filter, or to obtain some other information used for controlling operation of the air flow source.

[0054] The tag may comprise any suitable type of tag. In some cases, the tag may be an electronic tag, such as a radio-frequency identification (RFID) tag. In such a case, the tag reader may comprise a first antenna for communicating with the electronic tag, the electronic tag comprising a memory which stores information, and a second antenna for communicating with the tag reader. Communication between the tag reader and the electronic tag may be one-way or two-way. For example, the tag reader may be configured to read information stored in the memory of the electronic tag. In other cases, the tag may be a visible tag, on which information is displayed. The tag reader could then include an optical tag reader, configured to read the information displayed on the tag. Other types of tag could also be used, such as a magnetic tag, with a magnetic tag reader (e.g. magnetic sensor) in the frame.

[0055] The protective goggles may further comprise a controller configured to control operation of the air flow source based on the information obtained from the tag by the tag reader. In this manner, operation of the air flow source can be performed as a function of the information obtained from the tag, i.e. taking the information from the tag into account. This enables operation of the air flow source to be adapted to the filter being used, which may improve a performance of the protective goggles.

[0056] As an example, the information obtained from the tag on the filter may be indicative of one or more of: authentication information, filter identification, filter type, filter liftetime , date of manufacture, operating parameters to be used with the filter, or similar.

[0057] The controller may be configured with a predetermined set of instructions for controlling operation of the air flow source as a function of the obtained information. For instance, different filter types may be adapted for use with different fan speeds or air flow rates. Accordingly, the controller may be configured to control a speed or air flow rate of the air flow source based on a type of the filter, as determined from the information obtained from the tag. As another example, the controller may be configured to determine an authenticity of the filter based on authentication information obtained from the tag, and to only activate the air flow source if the filter is determined to be authentic.

[0058] As a further example, the controller may be configured to determine a filter lifetime (e.g. maximum usage time) based on the information obtained from the tag. Then, when a usage time of the filter exceeds the determined filter lifetime, the controller may be configured to generate an alert, to notify the user that the filter should be changed.

[0059] The controller may be implemented via any suitable computing (or processing) device, such as a microcontroller.

[0060] Where the tag is an electronic tag, a controller (e.g. the controller mentioned above) may be configured to determine when a usage time of the filter exceeds a predetermined threshold and, in response to determining that the usage time of the filter exceeds the predetermined threshold, update information stored in the tag. In this manner, the tag may store an indication that its usage time exceeds the predetermined threshold. This may avoid the filter from being used again once its usage time has already exceeded the predetermined threshold. For example, if the same filter is installed again in the protective goggles, the controller may determine based on the information stored in the tag that the predetermined threshold of usage time has already been exceeded for the filter. The controller may then, for example, generate an alert to notify the user that the filter should be changed.

[0061] The filter used in the first aspect may itself constitute an aspect of the invention. Thus, according to a second aspect of the invention there is provided a filter for protective goggles, the filter comprising a filter holder containing a filter medium, wherein: the filter holder is configured to be mounted in a brow portion of a frame of the protective goggles; the filter holder includes a first outlet arranged at a first end of the filter holder, the first outlet being arranged for fluid communication with a first air flow source in a first side wing of the frame when the filter holder is mounted in the frame; and optionally the filter holder includes a second outlet arranged at a second end of the filter holder, the second outlet being arranged for fluid communication with a second air flow source in a second side wing of the frame when the filter holder is mounted in the frame.

[0062] Any of the features described above in relation to the filter, filter holder, and filter medium are equally applicable to the second aspect of the invention.

[0063] The filter holder may be curved, to fit the brow portion of the frame.

[0064] According to a third aspect of the invention, there is provided protective goggles comprising: a frame; a visor connected to the frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a first air flow source arranged in a first side wing portion of the frame, the first air flow source being configured to generate a first air flow air flow into an ocular space defined by the protective goggles; a second air flow source arranged in a second side wing portion of the frame, the second air flow source being configured to generate a second air flow air flow into the ocular space; and an air intake in a brow portion of the frame, wherein the first air flow source and the second air flow source are each configured to draw air from the air intake to generate the first air flow and the second air flow, respectively.

[0065] In this manner, a respective air flow source may be arranged on either side of the visor, to cause air to flow into the ocular space. This contributes to making air flow in the ocular space more symmetrical and evenly distributed. This may facilitate maintaining a positive pressure within the ocular space, as well as improve defogging of the visor. In particular, the first air flow can serve to defog a first portion of the visor (e.g. next to the first side wing of the frame) and the second air flow can serve to defog a second portion of the visor (e.g. next to the second side wing of the frame). Additionally, providing air flow sources on either side of the protective goggles may improve a balance of the goggles, contributing to improved wearer comfort. Further, using a common air intake in the brow portion of the frame for both air flow sources contributes to making the protective goggles more compact and simplifies their construction.

[0066] Any features described in relation to the previous aspects of the invention are equally applicable to the protective goggles of the third aspect (and vice versa).

[0067] The frame, sealing arrangement and visor may be as described above in relation to the first aspect of the invention.

[0068] The first and second air flow sources may each be as described above in relation to any previous aspect of the invention. For example, each air flow source may comprise a fan or a pump configured to generate the air flow into the ocular space.

[0069] The protective goggles may further comprise a filter arranged to filter air in the air flow generated by the air flow source. The filter may arranged be upstream of the air flow source. The filter may be, for example, as described in relation to the preceding aspects of the invention.

[0070] The first side wing portion may correspond to a left-hand side wing of the frame and the second side wing portion may correspond to a right-hand side wing of the frame. The first air flow source may be mounted in a first cavity defined in the first side wing portion of the frame, and the second air flow source may be mounted in a second cavity defined in the second side wing portion of the frame.

[0071] The air intake is defined in the brow portion of the frame. For example, one or more air inlets may be provided in the brow portion, through which air can be drawn by the first and second air flow sources. Respective air flow channels (passageways) may be defined in the frame to connect the air intake to the first air flow source and the second air flow source.

[0072] The first air flow generated by the first air flow source and the second air flow generated by the second air flow source may have a same flow rate. Together, the first air flow and the second air flow may constitute (i.e. add up to) an air flow rate between about 1 Ipm and 8 Ipm. In other words, each air flow source may provide an air flow rate of between about 0.5 Ipm and 4 Ipm.

[0073] The first air flow source may be configured to direct the first air flow onto a first portion of an inner surface of the visor, and the second air flow source may be configured to direct the second air flow onto a second portion of the inner surface of the visor. In this manner, the first air flow and the second air flow can act to defog respective portions of the visor, which may improve visibility through the visor. For example, the first air flow source may be configured to direct the first air flow onto a left portion of the visor (e.g. located in front of the wearer’s left eye in use), and the second air flow source may be configured to direct the second air flow onto a right portion of the visor (e.g. located in front of the wearer’s right eye in use). The first air flow source may comprise (or be connected to) a first outlet arranged to direct the first air flow onto the first portion of the inner surface of the visor. The second air flow source may comprise (or be connected to) a second outlet arranged to direct the second air flow onto the second portion of the inner surface of the visor.

[0074] An outlet of the first air flow source may comprise a first nozzle for directing the first air flow onto the first portion of the inner surface of the visor, and the second air flow source may comprise a second nozzle for directing the second air flow onto the second portion of the inner surface of the visor. In this manner, the first and second air flows can be effectively directed onto the first and second portions of the inner surface of the visor, respectively, which may improve a defogging performance. Moreover, use of a nozzle may serve to accelerate the air flow, which can enhance the air flow’s ability to remove moisture from the inner surface of the visor.

[0075] In some cases, the outlet of the first air flow source can include a one-way valve, to prevent air from flowing out of the ocular space via the outlet of the first air flow source. Similarly, the outlet of the second air flow source can include a one-way valve, to prevent air from flowing out of the ocular space via the outlet of the second air flow source. The one-way valve may be provided in addition or alternatively to the nozzle mentioned above.

[0076] The air intake may comprise a filter mounted in the brow portion of the frame, the filter being arranged to filter air drawn via the air intake. Accordingly, air drawn via the intake by the first air flow source and the second air flow source passes through the filter, such that air blown into the ocular space by the air flow sources is filtered. Thus, a single filter can be used at the air take for filtering air in both air flows. The filter in the brow portion can include any of the features of the filter described above in relation to the preceding aspects of the invention.

[0077] The filter may comprise one or more air inlets, a first air outlet arranged towards a first end of the filter and in fluid communication with the first air flow source, and a second air outlet arranged towards a second end of the filter and in fluid communication with the second air flow source. Accordingly, air entering the filter via the one or more air inlets is split between the first and second air outlets to enter the first air flow and the second air flow, respectively. Thus, the one or more air inlets may act as the air intake of the protective goggles.

[0078] In line with the discussion above, the first air outlet of the filter may be in fluid communication with the inlet of the first air flow source via a first (e.g. airtight) air flow channel, and the second air outlet of the filter may be in fluid communication with the inlet of the second air flow source via a second (e.g. airtight) air flow channel.

[0079] Placing the first air outlet and the second air outlet towards (e.g. at or near) respective ends of the filter may ensure that air must flow through a certain length of the filter before reaching the air outlets, to ensure effective filtering. The first end of the filter may be adjacent the first side wing portion of the frame, whilst the second end of the filter may be adjacent the second side wing portion of the frame.

[0080] The one or more air inlets may comprise an air inlet arranged in a central portion of the filter (e.g. centred between the first end and the second end of the filter). In this manner, air entering via the air inlet in the central portion must flow in the filter from the central portion to the first end to exit via the first air outlet, and from the central portion to the second end to exit via the second air outlet. This may ensure that good filtering efficiency of the air in the first and second air flows.

[0081] The one or more air inlets may be arranged substantially symmetrically about a middle of the filter. This may provide symmetrical filtering performance for the first and second air flows. Here, the middle of the filter may correspond to a mid-point of the filter between the first end and the second end of the filter.

[0082] The one or more air inlets may correspond to the plurality of air inlets described in the fourth aspect of the invention.

[0083] A first channel defined in the frame may fluidly connect the air intake to the first air flow source, and a second channel defined in the frame fluidly connects the air intake to the second air flow source. Thus, air drawn in via the air intake is split between the two air flow channels to provide the first and second air flows, respectively. Defining the first and second air flow channels in the frame contributes to making the protective goggles more compact and of simpler construction. For example, the first air flow channel may connect the first air outlet of the filter and an inlet of the first air flow source, and the second air flow channel may connect the second air outlet of the filter and an inlet of the second air flow source.

[0084] In other words, the first channel may extend through a first portion of the frame between the air intake (e.g. first filter outlet) and the (inlet of) the first air flow source, and the second channel may extend through a second portion of the frame between the air intake (e.g. second filter outlet) and the (inlet of) the second air flow source. Thus, the first channel may be surrounded by material of first portion of the frame, e.g. to provide an airtight connection between the first outlet of the filter and the inlet of the air flow source. Likewise, the second channel may be surrounded by material of the second portion of the frame, e.g. to provide an airtight connection between the second outlet of the filter and the inlet of the second air flow source.

[0085] Herein, two components being fluidly connected may mean that the two components are connected such that a fluid (e.g. air) can flow from one component to the other.

[0086] The frame may comprise one of more exhaust outlets to allow air to flow out of the ocular space. In this manner, air from the first and second air flows can flow out of the ocular space via the one or more exhaust outlets. This enables air to flow continuously through the ocular space, enabling air in the ocular space to be regularly refreshed. This may serve to remove moisture from the ocular space, which may reduce condensation on the inner surface of the visor, thus improving visibility through the visor.

[0087] The one or more exhaust outlets may include any of the features described below in relation to the exhaust outlet(s) of the fourth aspect of the invention.

[0088] The one or more exhaust outlets may comprise a first exhaust outlet arranged to be located under a left eye of the wearer, and a second exhaust outlet arranged to be located under a right eye of the wearer. Thus, in use an exhaust outlet may be located under each eye of the wearer. This encourages the air flows into close proximity with portions of the inner surface of the visor located in front of the wearer’s eyes, to improve visibility through the visor. For example, the first air flow source may direct the first air flow onto a portion of the visor located in front of the left eye, such that the first air flow can flow out of the ocular space via the first exhaust outlet. Similarly, the second air flow source may direct the second air flow onto a second portion of the visor located in front of the right eye, such that the second air flow can flow out of the ocular space via the second exhaust outlet. Moreover, arranging the exhaust outlets under the wearer’s eyes may enable the exhaust outlets to function as drainage outlets for fluid (e.g. sweat, condensation) in the ocular space, as fluid may naturally flow towards the exhaust outlets.

[0089] The first exhaust outlet may be arranged on a left-hand side of a bridge portion of the frame, and the second exhaust may be arranged on a right-hand side of the bridge portion (where the bridge portion of the frame is arranged to pass over the wearer’s nose in use).

[0090] The first exhaust outlet may be defined by a first exhaust component mounted in a first opening of the frame, and / or the second exhaust outlet may be defined by a second exhaust component mounted in a second opening of the frame. A material of the first exhaust component and / or a material of the second exhaust component may have a greater hardness (e.g. stiffness) than a material of the frame. The first exhaust component and the second exhaust component may be connected by a bridge portion arranged to pass over a nose of the wearer, the bridge portion having a greater hardness (e.g. stiffness) than the material of the frame. The first exhaust component, the second exhaust component, and the bridge portion may be as described below in relation to further aspects. Thus, the first exhaust outlet, the bridge portion, and the second exhaust outlet may form a single component that is mounted to the frame, and which has a harder material than the frame. The single component may be referred to herein as an insert and / or as a reinforcing structure.

[0091] In some cases, the insert (including the first exhaust component, second exhaust component, and bridge portion) may comprise one or more connectors for mounting a vision correction device in the ocular space. Advantageously, as the insert is located in a portion of the frame under the wearer’s eyes, the insert can be used to mount the vision correction device in the ocular space in front of the wearer’s eyes. In other words, the vision correction device may be mounted between the wearer’s eyes and the visor. This facilitates using a vision correction device with the protective goggles. Moreover, as the insert is made of a harder material than the frame, the insert may provide a reliable support for the vision correction device, e.g. to ensure that the vision correction device remains position in front of the wearer’s eyes.

[0092] The connectors may comprise any suitable type of connector for mounting the vision correction device. As an example, each connector may be arranged to engage a corresponding mounting portion of the vision correction device, to hold the vision correction device in the ocular space. For instance, the connector may comprise a holder which is configured to receive a mounting post on the vision correction device.

[0093] In some cases, the insert may comprise a first connector and a second connector arranged on either side of the bridge portion. In this manner, the vision correction device may be attached to the insert on either side of the bridge portion, which may improve a stability with which the vision correction device is held in place. For instance, the first connector may be provided adjacent (next to) the first outlet component, and the second connector may be provided adjacent (next to) the second outlet component. Additionally or alternatively, a connector may be provided on the bridge portion of the insert.

[0094] The vision correction device may comprise any suitable device (or implement) for correcting a vision of the wearer. For instance, the vision correction device may comprise a pair of corrective lenses, and a frame in which the pair of corrective lenses is mounted. The frame may comprise one or more mounting portions, each arranged to engage a respective one of the one or more connectors on the insert.

[0095] Each of the one or more exhaust outlets may comprise a plurality of apertures, and a filter material covering the plurality of apertures. The plurality of apertures may allow air to flow out of the ocular space, whilst the filter material may serve to prevent contaminants from entering the ocular space via the apertures. The filter material could include, for example, a foam, felt or fabric material arranged to cover the plurality of apertures.

[0096] Each of the one or more exhaust outlets may be configured to provide a resistance to air flowing out of the ocular space. For example, a size, number and / or arrangement of the plurality of apertures, as well as a properties of the filter material, may be selected so as to achieve a desired air flow resistance.

[0097] The first air flow source may comprise a first radial fan, and / or the second air flow source may comprise a second radial fan. Use of a radial fan may facilitate integrating the air flow source into the side wing portion of the frame. In particular, a thickness of the radial fan along is axis of rotation may be adapted so that it can fit within a thickness of the frame, whilst providing a desired air flow rate. The radial fan may be arranged such that its axis of rotation is along a thickness direction of the frame. For example, the axis of rotation of the fan may be substantially normal to an adjacent surface of the visor, e.g. at an angle between 60° and 90° relative to the adjacent surface of the visor.

[0098] According to a fourth aspect of the invention, there is provided there is provided protective goggles comprising: a frame; a visor connected to the frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer, wherein the sealing arrangement and the frame are integrally formed as a single piece of material; and an air flow source configured to generate an air flow into an ocular space defined by the protective goggles.

[0099] In this manner, the frame and the sealing arrangement are integrally formed as a single piece of material, i.e. as a single part. This may simplify a manufacturing process for the protective goggles. For example, the frame and sealing arrangement can be moulded as a single part, e g. via a one-shot moulding process. Additionally, this arrangement can improve an integrity and performance of the protective goggles. In particular, forming the frame and the sealing arrangement as a single piece of material may avoid leaks arising between the sealing arrangement and the frame, thus allowing a high sealing efficiency of the protective goggles around the wearer’s eyes. This may be particularly beneficial in the context of CBRN protection, where any leak between the frame and the sealing arrangement could be highly dangerous for the wearer. Such a reduced leakage risk can also facilitate maintaining a positive pressure inside the ocular space. Further, a risk of the sealing arrangement becoming detached from the frame is reduced, thus improving a reliability and lifetime of the protective goggles.

[0100] Accordingly, the combination of the air flow source and the frame being integrally formed with the sealing arrangement can significantly reduce a risk of leakage of contaminants into the ocular space and improve a wearability of the protective goggles, such that the protective goggles provide effective protection in CBRN conditions.

[0101] Any features described in relation to the previous aspects of the invention are equally applicable to the protective goggles of the third aspect (and vice versa).

[0102] The frame, sealing arrangement and visor may be as described above in relation to the first aspect of the invention.

[0103] The air flow source may be as described above in relation to the first aspect of the invention. For example, the air flow source may comprise a fan or a pump configured to generate the air flow into the ocular space.

[0104] The protective goggles may further comprise a filter for arranged to filter air in the air flow generated by the air flow source. The filter may arranged be upstream of the air flow source. The filter may be, for example, as described in relation to the preceding aspects of the invention.

[0105] The protective goggles may further comprise a strap for securing the protective goggles to a head of the wearer, wherein the strap is connected to the visor. In conventional goggles, the head strap is typically connected to the frame. As a result, the frame in conventional goggles is made of a relatively rigid material, so as to support forces exerted on the frame by the strap. In contrast, connecting the strap to the visor in the protective goggles of the invention enables a more flexible and / or softer material to be used for the frame and sealing arrangement. Indeed, by connecting (attaching) the strap to the visor, forces exerted by the strap are primarily supported by the visor rather than the frame, such that the material used for the frame and the sealing arrangement can be more flexible and / or softer. Moreover, the visor may act to distribute a load from the strap over a wider area, e.g. to avoid concentration of stresses in the frame. Thus, the frame and sealing arrangement can integrally be formed as a single piece of material, whilst ensuring that the material of the sealing arrangement can have a high degree of flexibility so that it can effectively form a seal against the wearer’s face. The strap may be directly or indirectly connected to the visor, as discussed further below.

[0106] The visor may thus have a greater rigidity than the material of the frame and sealing arrangement. In other words, the visor may be less flexible than the frame and sealing arrangement. In this manner, the visor can serve to provide a degree of rigidity and maintain a shape of the protective goggles. For example, the visor may be formed of a relatively hard plastic, whilst the material of the frame and sealing arrangement may be a relatively flexible elastomeric material. The material of the visor can include, for example, polycarbonate, polyethylene terephthalate glycol (PETG), or acrylic. The material of the visor can have a Shore A hardness greater than 70. In some cases, the material of the visor can have a Shore D hardness greater than 50, and in some cases greater than 80 or 90. This may provide the visor with a high level of rigidity, so that it can readily withstand forces exerted by the strap in use.

[0107] The visor may have one or more connection regions (or attachment points) to which the strap is connected. The strap can be directly connected to the connection regions on the visor. Alternatively, the strap can be indirectly connected to the connection regions on the visor. For example, an intermediate component may be connected between the connection regions on the visor and the strap. For instance, a connector part may be secured to the visor (e.g. to the connection region(s) on the visor), the strap being attached to the connector part.

[0108] The visor may comprise a first connection region disposed towards a first end of the visor and to which a first end of the strap is connected, and a second connection region disposed towards a second end of the visor and to which a second end of the strap is connected. The first end and the second end of the visor may, for example, correspond to a left-hand side and right-hand side of the visor, respectively. Here, the left-hand side and right-hand side can be defined with respect to a wearer of the protective goggles. Thus, the strap can be connected at or near each end, so that the protective goggles can be securely attached to the wearer’s head.

[0109] The first connection region and the second connection region can include any suitable means to enable connection of the strap to the visor. For example, the first connection region may comprise a first loop, tab, protrusion, or the like to which the first end of the strap is attached. Likewise, the second connection region may comprise a second loop, tab, protrusion, or the like to which the second end of the strap is attached.

[0110] The first connection region and the second connection region may protrude from a surface of the frame. This can facilitate connection of the strap to the visor, by providing access to the connection regions. For example, the first connection region and the second connection region may each comprise one or more tabs which protrude from the surface (e.g. outer surface) of the frame. In line with the above, when the visor is mounted in the frame, the frame may surround the visor. The first connection region and the second connection region may then protrude through respective apertures (openings) formed in the frame.

[0111] Where the strap is connected to the visor via intermediate connector parts, the protective goggles may comprise a first connector part secured to a first connection region of the visor (e.g. at a left-hand side of the visor), and a second connector part may be secured to a second connection region of the visor (e.g. at a right-hand side of the visor). A first end of the strap may then be attached to the first connector part, and a second end of the strap is attached to the second connector part. The first and second connector parts are separate parts compared to the frame, such that the strap is not directly attached to the frame. For example, the first and second connector parts may be made from a different (e.g. more rigid) material than the frame. The first connection region and the second connection region may be shaped to provide a mechanical engagement with the first connector part and the second connector part, respectively. For example, each of the first connection region and the second connection region may comprise tabs (e.g. protrusions) which are engaged with the first connector part and the second connector part, respectively, to secure each of the first connector part and the second connector part to the visor.

[0112] The single piece of material may be an elastomeric material. In this manner the frame and sealing arrangement may be formed of a flexible material, so that the sealing arrangement can conform to a shape of the wearer’s face to form an effective seal against the wearer’s face. In line with the above, the frame and the sealing arrangement can integrally be formed as a single piece of elastomeric material via a moulding process. In this manner, all features of the frame and sealing arrangement can be formed as part of the moulding process, which can reduce a number of process steps for producing the protective goggles. The elastomeric material may comprise, for example, silicone, butyl rubber, thermoplastic polyurethan (TPU) or a thermoplastic elastomer (TPE).

[0113] The elastomeric material may have a Shore A hardness of 70 or less. This results in a high level of flexibility of the frame and sealing arrangement, enhancing its ability to conform to the wearer’s face and to form a tight seal with the wearer’s face. In some cases, the elastomeric material may have a Shore A hardness of 60 or less, and in some cases of 50 or less. The elastomeric material may have a Shore A hardness between 30 and 70.

[0114] The frame may have a first opening arranged; and a first exhaust component may be mounted in the first opening of the frame to define a first exhaust outlet of the protective goggles; and a material of the first exhaust component may have a greater hardness (e.g. stiffness) than the material of the frame. Providing an exhaust component in the first opening which has a greater hardness (e.g. stiffness) than the material of the frame may serve to support a shape of the frame. For example, this can prevent the opening from closing or collapsing under a pressure exerted on the frame by the strap when the protective goggles are worn. This can ensure that the exhaust outlet remains open and unobstructed during use of the protective goggles, to allow air to flow out of the ocular space. Thus, the first exhaust component may act as an endoskeleton part to support the shape of the frame and define the first exhaust outlet.

[0115] The first exhaust outlet may be configured to allow air to flow out of the ocular space. Thus, the air flow source can generate a continuous air flow which flows into the ocular space, and which exits the ocular space via the first exhaust outlet. Such a continuous air flow through the ocular space can serve to prevent contaminants from entering the ocular space, as well as help remove moisture from the ocular space to prevent or reducing fogging of the visor.

[0116] The first exhaust component may be held in the first opening of the frame via a push-fit connection or an interference fit between the first exhaust component and the frame. The first opening may be formed during moulding of the frame and sealing arrangement, so that no further processing steps are required. The first exhaust component may be formed of any suitable material having a greater hardness (e.g. stiffness) than the material of the frame and sealing arrangement. For example, the first exhaust component may be formed of a relatively rigid plastic material. The material of the first exhaust component may have a Shore A hardness greater than 70.

[0117] The first exhaust component may comprise a plurality of apertures (holes) arranged to allow air to flow out the ocular space. For example, the first exhaust component could comprise a grille or mesh defining a plurality of apertures. The first exhaust component may further comprise (or support) a filter material covering the plurality of apertures, to prevent ingress of contaminants via the plurality of apertures. The filter material could include, for example, a foam, felt or fabric material arranged to cover the plurality of apertures.

[0118] The first exhaust component may be configured to provide a resistance to air flowing out of the ocular space. This may facilitate achieving a positive pressure inside the ocular space. Configuring the first exhaust component to provide a resistance to air flow may avoid having to use a valve (e g. one way valve) on the first exhaust outlet, which may simplify a construction of the protective goggles. For example, a size, number and / or arrangement of the plurality of apertures, as well as a properties of the filter material, may be selected so as to achieve a desired air flow resistance.

[0119] In some cases, a one-way valve may further be provided on first exhaust outlet, to prevent back-flow of air into the ocular space via the first exhaust outlet.

[0120] The first opening may be arranged to be located under a left eye of the wearer, and the frame may further comprise a second opening arranged to be located under a right eye of the wearer; a second exhaust component may be mounted in the second opening of the frame to define a second exhaust outlet of the protective goggles; and a material of the second exhaust component may have a greater hardness (e.g. stiffness) than the material of the frame. Thus, in use an exhaust outlet may be located under each eye of the wearer. In this manner, the air flow may pass over (or adjacent) portions of the visor located in front of the wearer’s eyes, contributing to reducing of fogging in front of the wearer’s eyes. Moreover, due to the higher rigidity of the first and second exhaust components compared to the frame, the positioning of the first and second exhaust components under the wearer’s eyes can ensure that a desired spacing between the visor and the wearer’s eyes is maintained. For example, in line with the above, the first and second exhaust components can act to maintain the shape of the frame under the pressure exerted by the strap when the protective goggles are worn.

[0121] The second opening and second exhaust component may include any of the features discussed above in relation to the first opening and first exhaust component. Likewise, features discussed above for the first exhaust outlet are equally applicable to the second exhaust outlet.

[0122] The first opening and the second opening may be arranged on either side of a bridge portion of the frame, respectively, the bridge portion of the frame being arranged to pass over the wearer’s nose in use.

[0123] The first exhaust component and the second exhaust component may be connected by a bridge portion arranged to pass over a nose of the wearer, the bridge portion having a greater hardness (e.g. stiffness) than the material of the frame. Thus, together the first exhaust component, second exhaust component and bridge portion may act as a support structure (e.g. endoskeleton) which supports and maintains a shape of the more flexible frame.

[0124] In line with the discussion for the third aspect of the invention, the first exhaust component, bridge portion, and second exhaust component may form an insert that is mounted to the frame, and formed of a harder material than the frame. The insert may comprise one or more connectors for mounting a vision correction device in the ocular space.

[0125] The first exhaust component, the second exhaust component and the bridge portion may be integrally formed as a single piece of material. Thus, the first exhaust component, the second exhaust component and the bridge portion may constitute a single part which is fitted to the frame, and which provides a support structure for maintaining the shape of the frame. This can simplify manufacture and assembly of the protective goggles. For example, the first exhaust component, the second exhaust component and the bridge portion can be moulded as a single part, e.g. made of a relatively rigid plastic material. In line with the above, the material of the first exhaust component, the second exhaust component and the bridge portion has a greater hardness (e.g. stiffness) than the material of the frame. For example, the material of the first exhaust component, the second exhaust component and the bridge portion can have a Shore A hardness of more than 70.

[0126] The bridge portion may comprise an engagement feature arranged for engagement with a (separate) mask arranged to cover the wearer’s nose and mouth.

[0127] For example, the bridge portion may comprise a connector for detachable connection to a mask arranged to cover the wearer’s nose and mouth. In this manner, the protective goggles can be combined with a mask to form a modular respirator. Thus, the protective goggles can be used on their own or with the mask, depending on usage conditions.

[0128] Providing the connector in the bridge portion makes it easily accessible, including when the protective goggles are being worn. This enables the mask to be connected to, and disconnected from, the protective goggles whilst the protective goggles are being worn (and vice versa). Moreover, as the bridge portion is relatively rigid compared to the frame, this provides a sturdy connection between the protective goggles and the mask.

[0129] The connector in the bridge portion may be configured to engage (or be engaged by) a corresponding connector on the mask. For example, the connector may comprise a loop, e.g. which is configured to receive a hook-shaped connector on the mask. Alternatively, the connector may comprise a hook, which is configured to engage a loop-shaped connector on the mask.

[0130] Additionally or alternatively, the bridge portion may comprise a locating (or alignment) feature that is arranged for engagement with a corresponding locating feature on the mask. In this manner, when the wearer is wearing the protective goggles and the mask, the locating features on the bridge portion of the protective goggles and the mask can engage one another, to ensure correct positioning of the protective goggles and the mask relative to one another. As an example, a first one of the locating feature on the bridge portion and the mask could include a pair of locating pins (or prongs), and a second one of the locating feature on the bridge portion and the mask could include a protrusion (e.g. nib) arranged to be received between the pair of locating pins. Further details of a respirator comprising the protective goggles and a mask are provided below.

[0131] The first exhaust component and / or the second exhaust component may comprise one or more drainage channels for draining fluid out of the protective goggles. In this manner, the first and / or second exhaust components can serve to evacuate fluid from inside the protective goggles. For example, during prolonged use of the goggles, condensation may form on the visor and / or the wearer may sweat. As the first and second exhaust outlets are arranged under the eyes of the wearer, condensation and / or sweat may naturally flow towards the exhaust outlets. The drainage channels can then guide the fluid (condensation and / or sweat) towards an exterior of the protective goggles. This may avoid pooling of fluid in the ocular space, thus improving wearer comfort and facilitating prolonged wearing of the protective goggles.

[0132] The structure including the first exhaust component, second exhaust component and bridge portion may be referred to as a reinforcing structure (or as an insert). The reinforcing structure may be configured to fit onto an edge of the visor (e.g. lower edge of the visor), such that a portion of the frame is clamped between the reinforcing structure and the visor. For example, the reinforcing structure may be arranged to form a snap fit connection at multiple locations along the lower edge of the visor, to clamp the frame to the visor along the lower edge of the visor. This may provide a tight connection between the frame and the visor along its lower edge, improving an air-tightness of the ocular space.

[0133] The air flow source may be mounted in a cavity defined in the frame. In this manner, the air flow source may be directly integrated into the frame. This may make the protective goggles more compact and easier to handle. Additionally, the cavity can be formed as part of the manufacturing process for the frame, e.g. the cavity may be formed when moulding the frame and sealing arrangement. Thus, no further processing steps may be needed for mounting the air flow source in the frame, thus simplifying construction of the protective goggles. The cavity may be shaped to receive the air flow source, so that the air flow source can easily be inserted into the cavity. For example, the cavity may have a shape that is complementary to a shape of the air flow source.

[0134] The air flow source is retained in the cavity by friction with the frame. In this manner, no further fasteners may be needed for securing the air flow source in the frame, thus simplifying an assembly of the protective goggles. For example, an inner surface of the cavity may engage an outer surface of the air flow source (or a casing or housing in which the air flow source is located), resulting in the air flow source being retained in the cavity by friction between the surfaces. The cavity may be shaped to form a push-fit or interference connection with the air flow source. For instance, the cavity may be arranged to stretch around the air flow source when the air flow source is inserted into the cavity, so as to hold the air flow source in place in the cavity. In some cases, an opening of the cavity may comprise a lip which is arranged to engage a surface of the air flow source, to retain the air flow source in the cavity. Advantageously, elastomeric materials used for the frame may provide a relatively high coefficient of friction, enhancing the frame’s ability to retain the air flow source.

[0135] Accordingly, the integral structure formed by the frame and the sealing arrangement which provides multiple functions (e.g. holding the visor, providing a sealing surface, and supporting the air flow source), and can be produced via a single manufacturing step, e.g. a moulding process. An air flow channel may be defined (formed) in the frame, the air flow channel being in fluid communication with an inlet of the air flow source, and the air flow source may be configured to draw air via the air flow channel to generate the air flow into the ocular space. In this manner, the air flow source located in the cavity in the frame can draw in air from outside the protective goggles, to generate the air flow into the ocular space. The air flow channel may extend within the frame between the inlet of the air flow source and an air intake (inlet) of the protective goggles. Thus, the air flow channel constitutes a passageway defined in the material of the frame, e.g. such that the air flow channel is at least partially surrounded by the material of the frame. For example, a sidewall of the air flow channel may be defined by material of the frame. Similarly to the above, defining the air flow channel in the frame enables the air flow channel to be formed as part of the process (e.g. moulding process) for making the frame and sealing arrangement, thus simplifying manufacture of the protective goggles. Moreover, using the frame itself to define the air flow channel can reduce a number of components required and simplify a structure of the protective goggles.

[0136] A power source and / or controller of the air flow source may further be provided in the cavity with the air flow source. In this manner, the frame can act as a housing for the air flow source, power source and / or controller. The power source may comprise a battery, for example a rechargeable battery. The controller an electronic control device which is configured to control operation of the air flow source. For example, the controller may be configured to control activation of the air flow source, and / or a flow rate or speed of the air flow source.

[0137] The cavity may be defined in a side wing portion of the frame. This may facilitate integrating the air flow source into the frame without occluding the wearer’s vision. Additionally, arranging the air flow source in the side wing allows air to be blown across a width of the visor, which may improve a defogging performance. The side wing portion of the frame may correspond to a portion of the frame which projects laterally away from a side edge of the visor. For example, the side wing portion may correspond to a portion of the frame arranged on a left-hand side or a right-hand side of the visor. Thus, in use, the side wing portion may be arranged towards a side of the wearer’s face.

[0138] The protective goggles may further comprise a second air flow source configured to generate a second air flow into the ocular space, the second air flow source being mounted in a second cavity defined in the frame, wherein the second cavity is defined in a second side wing of the frame. Thus, the first air flow source may be in a first cavity defined in the first (e.g. left-hand side) side wing of the frame, and the second air flow source may be in a second cavity defined in the second (e.g. right-hand side) side wing of the frame. In this manner, an air flow source can be arranged on either side of the protective goggles, such that in use the air flow sources are disposed on either side of the wearer’s face. This may provide an even air flow on either side of the protective goggles, enabling effective defogging across the entire inner surface of the visor. For example, the air flow from the first air flow source may serve to primarily defog a portion of the visor located in front of the wearer’s left eye, and the air flow from the second air flow source may serve to primarily defog a portion of the visor located in front of the wearer’s right eye. Additionally, providing air flow sources on either side of the protective goggles may improve a balance of the goggles, contributing to improved wearer comfort. Any of the features described above in relation to the first air flow source are equally applicable to the second air flow source. For example, the second air flow source may be retained in the second cavity via friction. The second air flow source may be configured to draw air via a second air flow channel defined in the frame.

[0139] The protective goggles may further comprise a filter configured to filter air in the air flow generated by the air flow source, wherein the filter is mounted in a cavity defined in the frame. This may facilitate integrating the filter into the protective goggles, and contribute to making the protective goggles more compact. The cavity for the filter may be formed during manufacture (e.g. moulding) of the frame and sealing arrangement.

[0140] The filter may be removably mounted in the cavity. In this manner, the filter can easily be replaced when needed. For example, the filter may be held in the cavity via a push-fit or interference connection.

[0141] The filter may comprise a filter holder that contains a filter medium, the filter holder being formed of a material having a greater hardness (e.g. stiffness) than the material of the frame. In this manner, the filter holder may act as a support structure which helps to maintain a shape of the frame when the protective goggles are worn. For example, the filter holder may be made of a relatively rigid plastic material. The material of the filter holder may have a Shore A hardness greater than 70.

[0142] In some cases, the filter may be mounted in a brow portion of the frame, the brow portion of the frame being arranged to extend over eyes of the wearer in use. Thus, where a relatively hard material is used for the filter holder, the filter holder may act to reinforce the brow portion of the frame.

[0143] As noted above, the protective goggles may form part of a respirator. Thus, according to a fifth aspect of the invention, there is provided a respirator comprising: protective goggles according to the fourth aspect of the invention, wherein the frame has a first opening arranged to be located under a left eye of the wearer, and a second opening arranged to be located under a right eye of the wearer; a first exhaust component is mounted in the first opening of the frame to define a first exhaust outlet of the protective goggles; a second exhaust component is mounted in the second opening of the frame to define a second exhaust outlet of the protective goggles; a material of the first exhaust component and the second exhaust component has a greater hardness (e.g. stiffness) than the material of the frame; wherein the first exhaust component and the second exhaust component are connected by a bridge portion arranged to pass over a nose of the wearer, the bridge portion having a greater hardness (e.g. stiffness) than the material of the frame, wherein the bridge portion comprises an engagement feature; and a mask for covering the wearer’s nose and mouth; wherein the mask is engageable with the engagement feature.

[0144] The protective goggles can include any of the features described above in relation to the preceding aspects of the invention.

[0145] The engagement feature may be a connector in the bridge portion, such that the mask is detachably connectable to the connector. The connector in the bridge portion may constitute a first connector, and the mask may comprise a second connector, wherein the first connector and the second connector are detachably connectable together to detachably connect the protective goggles and the mask to one another. The second connector may be provided at a nose bridging portion of the mask.

[0146] A first one of the first connector and the second connector may comprise a hook.

[0147] A second one of the first connector and the second connector may comprise a catch or loop or ring or aperture or opening for connecting to the hook.

[0148] As another example, the engagement feature may be a locating (or alignment) feature that is arranged for engagement with a corresponding locating feature on the mask. In this manner, when the wearer is wearing the protective goggles and the mask, the locating features on the bridge portion of the protective goggles and the mask can engage one another, to ensure correct positioning of the protective goggles and the mask relative to one another. As an example, a first one of the locating feature on the bridge portion and the mask could include a pair of locating pins (or prongs), and a second one of the locating feature on the bridge portion and the mask could include a protrusion (e.g. nib) arranged to be received between the pair of locating pins.

[0149] The mask may comprise a filter arranged to filter air breathed into the mask, or the mask may be connected to a source of filtered air.

[0150] The mask may comprising a sealing arrangement configured to form a seal around the wearer’s mouth and nose. The sealing arrangement of the mask may be configured to engage the sealing engagement on the protective goggles when the mask is connected to the protective goggles.

[0151] According to a sixth aspect of the invention, there is provided a method of producing protective goggles, the method comprising: integrally forming a frame and a sealing arrangement as a single piece of material, wherein the sealing arrangement is configured to provide a seal between the frame and a face of a wearer; connecting a visor to the frame; and providing an air flow configured to generate an air flow into an ocular space defined by the protective goggles.

[0152] The method of the sixth aspect of the invention may be used for making the protective goggles of the fourth aspect of the invention. Accordingly, any features described in relation to the fourth aspect of the invention are applicable to the sixth aspect of the invention.

[0153] Integrally forming the frame and the sealing arrangement as a single piece of material may comprise moulding the frame and the sealing arrangement as a single piece of material.

[0154] Any cavities formed in the frame (e.g. first cavity for receiving a first air flow source, second cavity for receiving a second air flow source, and / or a cavity for receiving a filter) may be formed as part of the process of integrally forming the frame and sealing arrangement. For example, the cavities can be formed when moulding the frame and the sealing arrangement as a single piece of material. Similarly, any openings in the frame for defining exhaust outlets can be formed as part of this process. In other words, any features of the frame and sealing arrangement can be formed as part of a one-shot moulding process. In some cases, a two-shot moulding process can be used, e.g. where a first portion of the frame and sealing arrangement are formed via a first moulding process, and a second portion is overmoulded onto the first portion via a second moulding process.

[0155] Where a cavity is defined in the frame, the method may comprise inserting the air flow source into the cavity. Likewise, where a second cavity is defined in the frame, the method may comprise inserting the second air flow source into the second cavity. Where a cavity for the filter is defined in the frame, the method may comprise inserting the filter into the cavity.

[0156] According to a seventh aspect of the invention, there is provided protective goggles comprising: a frame, a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a visor connected to the frame; an air flow source configured to generate an air flow into an ocular space defined by the protective goggles; and an insert mounted in an opening or cavity formed in the frame; wherein the insert has a greater hardness (e.g. stiffness) that a material of the frame, and the insert comprises a connector for mounting a vision correction device in the ocular space.

[0157] In this manner, the protective goggles are adapted to receive a vision correction device (e.g. spectacles) in the ocular space, to correct a vision of the wearer. Providing a connector on the insert may avoid the vision correction device interfering with the seal formed by the sealing arrangement, thus avoiding leaks into the ocular space. Moreover, as the insert is formed of a harder material than the frame, the insert may provide a sturdy support for the vision correction device, to ensure that the vision correction device remains in place during use.

[0158] Any features described in relation to the previous aspects of the invention are equally applicable to the protective goggles of the seventh aspect (and vice versa).

[0159] Any features described in relation to the previous aspects of the invention are equally applicable to the protective goggles of the third aspect (and vice versa).

[0160] The frame, sealing arrangement and visor may be as described above in relation to the first aspect of the invention.

[0161] The first air flow source may be as described above in relation to any previous aspect of the invention. For example, the air flow source may comprise a fan or a pump configured to generate the air flow into the ocular space.

[0162] The protective goggles may further comprise a filter arranged to filter air in the air flow generated by the air flow source. The filter may arranged be upstream of the air flow source. The filter may be, for example, as described in relation to the preceding aspects of the invention.

[0163] The insert may also be referred to herein as a reinforcing structure.

[0164] The connector may comprise any suitable type of connector for mounting the vision correction device. In some cases, the insert may comprise multiple connectors for mounting the vision correction device. As an example, each connector may be arranged to engage a corresponding mounting portion of the vision correction device, to hold the vision correction device in the ocular space. For instance, the connector may comprise a holder which is configured to receive a mounting post on the vision correction device.

[0165] The vision correction device may comprise any suitable device (or implement) for correcting a vision of the wearer. For instance, the vision correction device may comprise a pair of corrective lenses, and a frame in which the pair of corrective lenses is mounted. The frame may comprise one or more mounting portions, each arranged to engage a respective one of the one or more connectors on the insert.

[0166] In line with the discussion in relation to the third and fourth aspects of the invention, the insert may comprise: a first exhaust component is mounted in the first opening of the frame to define a first exhaust outlet of the protective goggles; a second exhaust component is mounted in the second opening of the frame to define a second exhaust outlet of the protective goggles; and optionally, a bridge portion that connects the first and second exhaust components, the bridge portion being arranged to pass over a nose of the wearer. Any of the features described in relation to the first and second exhaust components and the bridge portion in relation to preceding aspects are applicable to the insert of the seventh aspect.

[0167] The insert may comprise a first connector and a second connector arranged on either side of the bridge portion. Additionally or alternatively, a connector may be provided on the bridge portion of the insert.

[0168] The protective goggles may comprise the vision correction device, the vision correction device being removably mountable to the connector of the insert.

[0169] Herein, where a first material or component is said to have a greater hardness than a second material or component, then the first material or component may also be said to have a greater stiffness than the second material or component. In other words, the first material or component may be less bendable (flexible) than the second material or component. For instance, a Young’s Modulus of the first material or component may be greater than a Young’s modulus of the second material or component.

[0170] The invention includes the combination of the aspects and preferred features described except where such a combination is clearly impermissible or expressly avoided.

[0171] Summary of the Figures

[0172] Embodiments and experiments illustrating the principles of the invention will now be discussed with reference to the accompanying figures in which:

[0173] Fig. 1 shows a schematic front view of protective goggles according to an embodiment of the invention;

[0174] Fig. 2 shows a schematic perspective view of the protective goggles;

[0175] Fig. 3 shows a front view of a frame and sealing arrangement of the protective goggles;

[0176] Fig. 4 shows a perspective view of the frame and sealing arrangement of the protective goggles;

[0177] Fig. 5 shows a partial sectional view of the frame and sealing arrangement of the protective goggles;

[0178] Fig. 6 shows a schematic perspective view of an air flow source that may form part of the protective goggles;

[0179] Fig. 7 shows a schematic top view of an arrangement of a visor and first and second air flow sources of the protective goggles;

[0180] Fig. 8 shows a schematic front view of a reinforcing structure of the protective goggles;

[0181] Fig. 9 shows a schematic top view of the reinforcing structure; Fig. 10 shows a schematic perspective view of a respirator according to an embodiment of the invention, the respirator including the protective goggles of Fig. 1 ;

[0182] Fig. 11 shows a schematic rear view of the respirator;

[0183] Fig. 12 shows a partial front view of the protective goggles;

[0184] Fig. 13 shows a partial front view of the protective goggles;

[0185] Fig. 14 shows a schematic perspective view of a filter for the protective goggles according to an embodiment of the invention;

[0186] Fig. 15 shows a schematic top view of a filter holder of the filter;

[0187] Fig. 16 shows a schematic top view of a lid of the filter holder;

[0188] Fig. 17 is a schematic front view of the protective goggles, illustrating air flow paths through the protective goggles;

[0189] Fig. 18 is a schematic diagram showing electrical components included in the protective goggles, according to an embodiment of the invention;

[0190] Fig. 19 shows a schematic perspective view of a reinforcing structure and vision correction device that can be used with protective goggles according to the invention;

[0191] Fig. 20 shows a schematic perspective view of the vision correction device; and

[0192] Fig. 21 shows a schematic perspective view of a filter holder and visor that can be used with protective goggles according to the invention.

[0193] Detailed Description of the Invention

[0194] Aspects and embodiments of the present invention will now be discussed with reference to the accompanying figures. Further aspects and embodiments will be apparent to those skilled in the art.

[0195] Protective goggles 100 according to an embodiment of the invention are described with reference to Figs. 1 to 18. Fig. 1 shows a front view of the protective goggles 100, whilst Fig. 2 provides a perspective view showing an interior of the protective goggles 100. The protective goggles 100 are configured to protect a wearer’s eyes, and may be used as part of chemical, biological, radiological and nuclear (CBRN) personal protective equipment, i.e. the protective goggles 100 may be CBRN protective goggles. The protective goggles 100 include a frame 102 in which a visor 104 is mounted. The frame 102 is arranged to hold the visor 104 in front of the wearer’s eyes when in use, so that the wearer can see through the visor 104. The visor 104 is formed of a transparent or partially transparent material, e.g. polycarbonate or polyurethane. A sealing arrangement 106 is arranged on a rear side of the frame 102, and is configured to provide a substantially airtight barrier between the frame 102 and the face of a wearer when in use. The sealing arrangement 106 extends around an edge of the frame 102, in order to form a seal around the wearer’s eyes. The sealing arrangement includes a sealing surface (or strip) which is arranged to contact the wearer’s face in use, in order to form a seal against the wearer’s face (skin). The frame 102, visor 104 and sealing arrangement thus define an ocular space 108, which is a region enclosed by the protective goggles 100 around the wearer’s eyes when in use. Accordingly, the protective goggles 100 can prevent contaminants (e.g. dangerous gases, vapours, and / or airborne particles) from entering the ocular space 108, to protect the wearer’s eyes.

[0196] As described in more detail below, the protective goggles 100 includes a pair of air flow sources mounted in the frame 102, which are configured to generate an air flow into the ocular space 108. The air flow into the ocular space can provide a positive pressure in the ocular space 108, i.e. such that a pressure in the ocular space 108 is greater than a pressure of a surrounding atmosphere. This serves to prevent contaminants from entering the ocular space 108, e.g. via any leak between the sealing arrangement 106 and the wearer’s face. Additionally, the flow into the ocular space can act to defog an inner surface of the visor 104, to improve visibility through the visor 104.

[0197] In embodiments of the invention, the frame 102 and the sealing arrangement 106 are integrally formed as a single piece of material. In particular, the frame 102 and the sealing arrangement 106 can be moulded as a single component, e.g. via a one-shot moulding process. For example, an injection moulding process can be used to produce the frame 102 and the sealing arrangement 106 as a single component. Fig. 3 shows a front view of the fame and sealing arrangement component on its own (i.e. without other components of the protective goggles), and Fig. 4 shows a perspective rear view of the frame and sealing arrangement component. The shape of the component including the frame 102 and sealing arrangement 106 can be entirely defined via the moulding process, such that no further processing of the frame 102 and sealing arrangement 106 may be needed for assembly of the protective goggles 100. In particular, a variety of features are defined in the frame 102 as part of the moulding process, in order to mount various components of the protective goggles 100 in the frame 102. The frame 102 and sealing arrangement 106 are made of a relatively flexible material, such as an elastomeric material having a Shore A hardness of 70 or less. Examples of suitable elastomeric materials include silicone, TPE, TPU, butyl rubber.

[0198] Among the features defined in frame 102 is a groove (or channel) 110 for receiving an edge of the visor 104, such that the visor 104 can be fitted into groove 110 to mount the visor 104 in the frame 102. Thus, as shown in Fig. 1 , the frame 102 surrounds the visor 104.

[0199] In order to mount the air flow sources in the frame 102, a first cavity 112 and a second cavity 114 are defined in the frame. These are shown in Fig. 5, which provides a sectioned view of the frame and sealing arrangement component, taken along the plane 300 indicated in Fig. 3. The first cavity 112 is defined in a left-hand side portion (wing portion) 116 of the frame 102 which is located on a left-hand side of the frame 102, i.e. such that the left-hand side portion 116 is arranged on a left-hand side of the visor 104. The second cavity 114 is defined in a right-hand side portion (wing portion) 118 of the frame 102 which is located on a right-hand side of the frame 102, i.e. such that the right-hand side portion 118 is arranged on a right-hand side of the visor 104. The first cavity 112 is arranged (shaped) to receive a first air flow source, and the second cavity 114 is arranged (shaped) to receive a second air flow source. For example, a shape of the first cavity 1 12 may be complementary to a shape of the first air flow source (or of a housing containing the first air flow source), and a shape of the second cavity 114 may be complementary to a shape of the second air flow source (or of a housing containing the second air flow source).

[0200] A first aperture 130 is defined in the frame 102, to provide fluid communication between the first cavity 112 and the ocular space 108. The first aperture 130 is arranged for alignment with an outlet of the first air flow source, so that air can flow from the first air flow source into the ocular space 108. A second aperture 132 is defined in the frame 102, to provide fluid communication between the second cavity 114 and the ocular space. The second aperture 132 is arranged for alignment with an outlet of the second air flow source, so that air can flow from the second air flow source into the ocular space 108. Additionally, the frame 102 includes a first lip 134 arranged next to the first aperture 130, in order to retain the first air flow source in the first cavity 112. As the frame is formed of a relatively flexible material, the first air flow source can be push-fitted (inserted) into the first cavity 112, and held in place via friction with the frame 102 and by the first lip 134. Similarly, the frame 102 includes a second lip 136 arranged next to the second aperture 132, in order to retain the second air flow source in the second cavity 114. The second air flow source can be push-fitted (inserted) into the second cavity 114, and held in place via friction with the frame 102 and by the second lip 136.

[0201] An example of an air flow source 120 that can be mounted in the first cavity 112 and the second cavity 114 is shown in Fig. 6. As shown, the air flow source 120 includes a radial fan 122 which is mounted in a housing 124. A compartment 126 is connected to the housing 120 below the radial fan 122, in which a power source (e g. battery) and / or circuitry associated with the radial fan 122 is contained. For example, a controller for controlling operation of the radial fan 122 may be located in the compartment 126. The housing 120 includes an outlet 128 via which an air flow generated by the radial fan 122 flows out of the housing 124. Additionally, an opening is formed in a sidewall of the housing 124 to expose an inlet 138 of the radial fan 122 located on a side of the radial fan 122, so that the radial fan 122 can draw in air via its inlet 138. The housing 124 and the compartment 126 may be integrally formed as a single piece of material, e.g. via a moulding process. The material of the housing 124 and the compartment 126 may have a greater hardness (e.g. stiffness) than the material of the frame. For example, the housing 124 and compartment 126 may be made of a relatively rigid plastic. Each of the first cavity 112 and the second cavity 114 is shaped to receive a respective air flow source arranged as air flow source 120. Thus, each ofthe first cavity 112 and the second cavity 114 may have a shape that is complementary to a shape of the air flow source 120, including the housing 124 and compartment 126.

[0202] Fig. 7 illustrates positions in which a first air flow source 120a and a second air flow source 120b are held by the frame 102 relative to the visor 104. A top view of the visor 104 and the first and second air flow sources 120a, 120b is shown in Fig. 7. For illustration purposes, other components of the protective goggles 100 such as the frame 102 are omitted from Fig. 7. The first and second air flow sources 120a, 120b correspond to the air flow source 120 described above. As can be seen, the frame 102 holds the first and second air flow sources 120a, 120b adjacent to the left-hand and right-hand sides of the visor respectively. The outlet 128 of the first air flow source 120a is aligned with the first aperture 134 in the frame, so that air exiting the first air flow source 120a enters the ocular space 108. The outlet 128 of the second air flow source 120b is alight with the second aperture 136, so that air exiting the second air flow source 120b enters the ocular space 108. In more detail, the first air flow source 120a is held so that an axis of rotation of its radial fan (indicated by the dashed line 140 in Fig. 7) is substantially normal to surface of the visor 104 adjacent to the first air flow source 120a, and the second air flow source 120b is held so that an axis of rotation of its radial fan (indicated by dashed line 142 in Fig. 7) is substantially normal to a surface of the visor 104 adjacent to the second air flow source 120b. In this manner, the air flows exiting the first and second air flow sources 120, 120b flows tangentially along the inner surface of the visor 104. The first air flow source 120a and the second air flow source 120b are arranged substantially symmetrically about a middle plane of the protective goggles 100.

[0203] In some cases, the compartment 126 of one or both of the first and second air flow sources 120a, 120b can contain a respective power source (e.g. battery) for powering the air flow sources. In some cases, the compartment 126 of one of the first and second air flow sources 120a, 120b may contain a power source (e.g. battery) for power both the first and second air flow sources 120a, 120b, and the compartment 126 of the other one of the first and second air flow sources 120a, 120b may contain control electronics (e.g. a controller) for controlling operation of the first and second air flow sources 120a, 120b.

[0204] The protective goggles 100 further include a reinforcing structure 148, which is shown on its own in Figs. 8 and 9. The reinforcing structure 148 may also be referred to as an insert. Fig. 8 shows a front view of the reinforcing structure 148, and Fig. 9 shows a top view of the reinforcing structure 148. The reinforcing structure 148 is integrally formed as a single piece of material, e.g. via a suitable moulding process. The reinforcing structure 148 is made of a material having a greater harness than the material of the frame 102, e.g. the material of the reinforcing structure 148 can have a Shore A hardness greater than 70. The reinforcing structure can include, for example, a thermoplastic material, PA66, polycarbonate, polypropylene, or similar. The reinforcing structure 148 includes a first exhaust component 150 and a second exhaust component 152, which are connected via a bridge portion 154. The first exhaust component 150 is mounted in a first opening 144 defined in the frame 102, the first opening 144 being arranged to be located under the wearer’s left eye in use. The second exhaust component 152 is mounted in a second opening 146 defined in the frame 102, the second opening 146 being arranged to be located under the wearer’s right eye in use. The bridge portion 154 is shaped to pass over the wearer’s nose in use. The first opening 144 and the second opening 146 in the frame 102 are shown, for example, in Fig. 3. The first and second exhaust components 150, 152 include a series of tabs 156 which are configured to secure the first and second exhaust components 150, 152 in the first and second openings 144, 146, respectively.

[0205] Each of the first and second exhaust components 150, 152 includes a plurality of apertures 158, via which air can flow out of the ocular space 108. Thus, each of the first and second exhaust components 150, 152 defines a respective exhaust outlet of the protective goggles 1 10, via which air can flow out of the ocular space 108. In the example shown, the plurality of apertures 158 are circular or semi-circular. However, other shapes and arrangements of apertures can be used. The plurality of apertures 158 may further serve as drainage channels via which fluid (e.g. sweat or condensation) can exit the ocular space 108. Additionally or alternatively, one or more channels or grooves may be provided in the first and second exhaust components 150, 152 to guide (e.g. wick) fluid out of the ocular space 108. The first and second exhaust components 150, 152 may each further comprise a filter material (not shown), which is arranged to cover the plurality of apertures 158 to prevent ingress of contaminants via the plurality of apertures. In particular, each of the first and second exhaust components 150, 152 includes a sidewall surrounding the plurality of apertures, defining a space for holding a filter material. The filter material could include any suitable filter material, such as a foam, cloth or fabric filter material. The plurality of apertures 158 and filter material (if provided) can be arranged to provide a resistance to air flow out of the ocular space, e.g. to facilitate maintaining a positive pressure in the ocular space. For example, a number and / or size of the plurality of apertures 158 can be reduced to increase a resistance to air flow via the plurality of apertures 158. Additionally or alternatively, a thickness and / or density of the filter material in the first and second exhaust components 150, 152 can be increased to increase a resistance to air flow via the plurality of apertures 158.

[0206] As the reinforcing structure 148 is made of a material having a greater hardness (e.g. stiffness) than the frame 102 (i.e. such that the reinforcing structure 148 has a greater rigidity than the frame 102), the reinforcing structure 148 acts to reinforce the frame 102 and helps maintain a shape of the frame 102 during use. In particular, the relatively rigid first and second exhaust components 150, 152 can ensure that the first and second openings 144, 146 in the frame 102 remain open during use, to ensure that air can flow out of the ocular space 108 during use. Additionally, the bridge portion 154 acts to reinforce a bridge portion of the frame 102 which passes over the wearer’s nose.

[0207] The reinforcing structure 148 may further comprise a first connector 160 for detachably connecting a respirator mask. In the example shown, the first connector 160 includes a catch (e.g. loop or eyelet) which projects outwardly (i.e. forwards) from the frame 102. The connector 160 is configured for engagement with a corresponding connector on the mask. Connection between the protective goggles 100 and a mask 800 is illustrated in Figs. 10 and 11. Alternatively, instead of the connector 160, the reinforcing structure 148 may be provided with a locating (or alignment) feature arranged for engagement with a corresponding locating feature on the mask. For example, a pair of locating pins (or protrusions) may extend outwards from the bridge portion 154, and the mask may comprise a protrusion arranged to be received between the pair or locating pins when the protective goggles 100 and the mask are worn together. This may ensure that the protective goggles 100 and the mask are correctly located with respect to one another.

[0208] The mask 800 may be referred to as an oro-nasal mask, for example. The mask 800 is configured to filter ambient gas inhaled into the mask 800 by a person wearing the mask, to produce filtered gas for breathing by the wearer. The mask 800 can therefore protect the wearer from inhaling harmful substances in ambient air. In particular, the mask 800 can include one or more filters connected to the mask 800 that include a filtration medium, such as activated carbon, that filters ambient air (or other gas) inhaled into the mask 800 from outside the mask 800 by the wearer, to produce filtered air (or other filtered gas) for breathing. Such a mask 800 may be referred to as a filtration mask, for example. In embodiments, the mask 800 may preferably be a half-mask. In an alternative embodiment, the mask 800 may instead be connected to a source of breathable gas, for example a container or tank of breathable gas, which is typically pressurised (e.g., a container of compressed breathable gas), to supply gas to the mask 800, or an external air filter. The breathable gas may comprise filtered air. The gas in the mask 800 breathed in by the wearer may therefore be separate to and / or isolated from ambient gas / air on the outside of the mask 800.

[0209] The mask 800 is configured to form a seal around the nose and mouth of the person wearing the mask. The mask 800 comprises a second sealing arrangement 802 configured to form the seal around the nose and mouth of the person wearing the mask. In particular, the mask 800 comprises a rigid nose-cup 804 to define a cavity around the nose and mouth of the wearer, with the sealing arrangement 802 being arranged around the periphery of the cavity. The sealing arrangement 802 may be formed of a flexible elastomeric material, to form a substantially air-tight seal against the wearer’s skin. The mask 800 can be held in place over the nose and mouth of the wearer using one or more straps, for example one or more head straps. The mask 800 is configured to provide a sealed breathing cavity or space that extends from the top of the nose of the user to a point between the chin of the user and the mouth of the user. The mask 14 therefore has a similar geometry to a quarter mask. The sealed breathing cavity or space may be referred to as an oronasal cavity, for example.

[0210] The mask 800 may comprise an outlet valve or exhale valve that is configured to allow flow of gas in a direction from the inside of the mask to the surrounding environment and to prevent flow of gas in a direction from the surrounding environment to the inside of the mask. Therefore, air or gas breathed out by a user of the mask 800 can be discharged from the mask 800.

[0211] The protective goggles 100 and the mask 800 are provided as separate (i.e., modular) components which can be easily disconnected and connected to one another, and are in particular designed such that they can be easily disconnected and connected to one another while a user is wearing either of the protective goggles 100 or the mask 800. The mask comprises a second connector 806 which is configured to engage the first connector 160 on the protective goggles 100 to connect the mask 800 to the protective goggles 100. In the example shown, the second connector 806 comprises a hook which projects upwardly from the nose-cup 804 to engage the first connector 160. In particular, the hook is arranged to pass through the loop or eyelet provided by the first connector 160, to connect the mask 800 to the protective goggles 100. An opening of the hook faces at least partly downwards, so that, when the mask 800 is connected to the protective goggles 100, the mask 800 cannot be pulled downwards away from the protective goggles 100 without lifting and / or rotating the mask 800 to disconnect the mask 800 from the protective goggles 100. By being shaped in this way, the hook also ensures that the mask 800 may hang from the protective goggles 100 when attached, and also ensures fitment can only occur in one direction - that is, from beneath the protective goggles 100, between the wearer’s nose and the protective goggles 100. It will be appreciated that in other embodiments, the first connector 160 may be located on the mask 800, and the second connector 806 may be located on the protective goggles 100.

[0212] Together, the protective goggles 100 and the mask 800 form a respirator according to an embodiment of the invention. Fig. 10 shows a perspective view of the respirator, where the mask 800 is connected to the protective goggles 100. Fig. 11 provides a rear view of the respirator, showing an inside of the protective goggles 100 and the mask 800. As can be seen in Fig. 11 , the sealing arrangement 106 of the protective goggles 100 and the sealing arrangement 802 of the mask 800 overlap one another to form a continuous sealing surface which is arranged to extend around (or over) a bridge of the wearer’s nose, such that the continuous sealing surface extends from a left side of the wearer’s nose to a right side of the wearer’s nose. In this way, the sealing arrangements 106, 802 form a layered (overlapping) structure in the bridge region, to prevent leak paths between the sealing arrangements 106, 802. This provides additional protection to ensure that the ocular space 108 and space enclosed by the mask 800 are airtight.

[0213] The protective goggles 100 further comprise a strap 162 for securing the protective goggles 100 to the wearer’s head. For illustration purposes, parts of the strap 162 are shown in dashed lines in Figs. 1 and 13. The strap 162 may, for example comprise an elasticated band, which may have an adjustable length to fit different head sizes. The strap 162 is connected to projecting tabs 164 located on either side of the visor 104. In particular, the left-hand side and the right-hand side of the visor 104 each include a connection region from which the tabs 164 protrude. The tabs 164 are integrally formed as part of the visor 104. For example, the visor 104 may be moulded or otherwise machined to have the tabs 164. Fig. 12 shows a close-up front view of a left-hand side of part of the protective goggles 100. As can be seen, the tabs 164 protrude through apertures 166 in the frame 102, such that they protrude beyond an outer surface of the frame 102. In more detail the left hand side of the visor 104 includes a first tab 164a which protrudes from an upper edge of the visor 104, and a second tab 164b which protrudes from a lower edge in the frame 102, the tabs 164a, 164b protruding through respective apertures 166a, 166b in the frame. A corresponding tab arrangement is provided on the right-hand side of the visor 104. As shown in Fig. 13, a first connector part 168a which is arranged to sit over the left-hand side portion 116 of the frame is connected to the protruding tabs 164a, 164b, e.g. via a snap-fit connection. The first connector part 168a includes a loop (or eyelet) 170 to which an end of the strap 162 is attached. A second connector part 168b is similarly arranged to sit over the right-hand side portion 118 of the frame, and is connected to the protruding tabs 164 on the right-hand side of the visor 104, e.g. via a snap-fit connection. A second end of the strap 162 is connected to a loop (or eyelet) 172 on the second connector part 168b. Thus, the ends of the strap 162 are connected to the ends of the visor 104, via the first and second connector parts 168a, 168b. The first and second connector parts 168a, 168b are made of a material having a greater hardness (e.g. stiffness) than the material of the frame 102, e.g. having a Shore A hardness greater than 70. For example, the first and second connector pats 168a, 168b may be made of a relatively hard plastic. For illustration purposes, the first connector part 168a is omitted from Fig. 12.

[0214] The protective goggles 100 further include a filter 174 arranged in a brow portion 176 of the frame 102, the filter 174 being arranged to filter air drawn by the first air flow source 120a and the second air flow source 120b. In particular, a filter cavity 178 for receiving the filter 174 is formed in the brow portion 176, the filter cavity 178 extending along a width of the brow portion 176 between the right-hand side portion 116 and the left-hand side portion 1 18 of the frame 102. The filter 174 is removably mountable in the filter cavity 178, and may be retained in the filter cavity 178 by a push-fit connection and / or an interference fit with the cavity 178, for example. As can be seen in Fig. 4, for example, a first air flow passage 180 is defined in the left-hand side portion 116 of the frame 102 which fluidly connects a first end of the filter cavity 178 to the first cavity 112 in which the first air flow source 120a is located. Additionally, a second air flow passage 182 is defined in the right-hand side portion 118 of the frame 102 which fluidly connects a second end of the filter cavity 178 to the second cavity 114 in which the second air flow source 120b is located.

[0215] Fig. 14 shows a perspective view of the filter 174. The filter 174 includes a filter holder (or housing) 184 which is shaped to fit in the filter cavity 178. Thus, the filter holder 184 is curved, to match a curvature of the brow portion 176 of the frame 102. A top view of the filter holder 184 on its own is shown in Fig. 15. The filter holder 184 is formed of a material having a greater hardness (e.g. stiffness) than the material of the frame 102, e.g. having a Shore A hardness greater than 70. In some cases, the filter holder 184, reinforcing structure 148, and connector parts 168a, 168b may all be formed of a same or similar material. The filter holder 184 can include one or more engagement features on its outer surface to engage a surface of the filter cavity 178, to thereby retain the filter holder 184 in the filter cavity 178. For example, the outer surface of the filter holder 184 can include a lip and / or a barbed feature on its outer surface for retaining the filter holder 184 in the filter cavity 178.

[0216] The first end of the filter holder 184 has a first outlet 186 arranged over the left-hand side portion 116 of the frame 102 when the filter holder 184 is mounted in the filter cavity 178, such that the first outlet 186 is in fluid communication with the first air flow passage 180. The second end of the filter holder 184 has a second outlet 188 arranged over the right-hand side portion 118 of the frame 102 when the filter holder 184 is mounted in the filter cavity 178, such that the second outlet 188 is in fluid communication with the second air flow passage 182. The filter holder 184 contains a filter medium 190. The filter medium 190 fills an interior space of the filter holder 184, and covers the first outlet 186 and the second outlet 188. The filter medium 190 serves to filter air passing through the filter 174, to remove contaminants from the air. As an example, the filter medium 190 can include an activated carbon cloth or fabric, and / or a particulate filter material. The filter medium 190 is bonded to the filter holder 184, so that an airtight seal is formed between the filter material 190 and the filter holder 184.

[0217] The filter holder 184 includes a lid or cover 192, a top view of which is shown in Fig. 16. For illustration purposes, the filter holder 184 is shown without the cover in Fig. 14, so that the filter medium 190 can be seen. Likewise, the lid 192 is omitted from Fig. 15, so that the first and second outlets 186, 188 are visible in Fig. 15. The lid 192 defines an upper surface of the filter 174. Together, the lid 192 and the rest of the filter holder 184 enclose the filter material 190. The lid 192 includes a plurality of holes which define a plurality of air inlets 194 for the filter 174. As shown in Fig. 16, the plurality of air inlets 194 are arranged in order of decreasing size (e.g. width or diameter) from a middle of the filter 174 towards each end of the filter 174. In other words, starting from each end of the filter 174, the apertures increase in size towards the middle of the filter 174. In this way, air is preferentially drawn into the filter towards the middle of the filter 174. A similar effect can alternatively or additionally be achieved by increasing a frequency of the air inlets towards the middle of the filter 174. For illustration purposes, the air inlets 194 are not depicted in the view of Fig. 2.

[0218] Fig. 17 shows a front view of the protective goggles illustrating an air flow through the protective goggles 100, when in use. In use, the protective goggles 100 are positioned over the wearer’s eyes, and secured to the wearer’s head using the strap 162. The first air flow source 120a and the second air flow source 120b can then be activated. This causes air to be drawn into the filter 174 via the plurality of air inlets 194 defined in the lid 192 of the filter holder 184. Air flow into the filter is indicated by the arrows 200 in Fig. 17. Air flowing into the filter 174 is then drawn to the first outlet 186 of the filter 174 and through the first air flow passage 180 in the frame 102 by the first air flow source 120a, as shown by arrow 202. The air drawn by the first air flow source 120a is blown out via the outlet 128 of the first air flow source 120a into the ocular space 108, corresponding to a first air flow 204 into the ocular space 108. The first air flow 204 can then exit the ocular space 108 via the first exhaust outlet defined by the first exhaust component 150. Similarly, air flowing into the filter 174 is drawn to the second outlet 188 of the filter 174 and through the second air flow passage 182 in the frame 102 by the second air flow source 120b, as shown by arrow 206. The air drawn by the second air flow source 120b is blown out via the outlet 128 of the second air flow source 120b into the ocular space 108, corresponding to a second air flow 208 into the ocular space 108. The second air flow 208 can then exit the ocular space 108 via the second exhaust outlet defined by the second exhaust component 152.

[0219] The first air flow 204 and the second air flow 208 into the ocular space can create a positive pressure in the ocular space 108. Additionally, the first and second air flows 204, 208 can serve to remove moisture from the ocular space 108, to reduce condensation on the visor 104. Fig. 7 shows a direction of the first air flow 204 exiting the first air flow source 120a, and a direction of second air flow 208 exiting the second air flow source 120b. As can be seen, the first air flow 204 is incident on a left-hand portion of the inner surface of the visor 104, located in front of the wearer’s left eye in use. The second air flow 208 is incident on a right-hand portion of the inner surface of the visor 104, located in front of the wearer’s right eye in use. In this manner, the first and second air flows 204, 208 may serve to defog the first and second regions of the inner surface of the visor 104, respectively. In some cases, the outlet 128 of the first and second air flow sources 120a, 120b may be provided with a nozzle which is directed towards the first and second regions of the inner surface of the visor 104, respectively. This can facilitate directing the air flows onto regions of the inner surface of the visor 104 located in front of the wearer’s eyes, as well as accelerate the air flows which may enhance defogging of the visor 104.

[0220] In some embodiments, the filter 174 can include a tag 210 which includes information relating to the filter 174, and which can be used by the protective goggles 100 for controlling operation of the air flow sources 120a, 120b. For example, the tag 210 can include an electronic tag, such as an RFID tag, which is mounted in (disposed in) the filter holder 184 as indicated by the dashed lines in Fig. 15. Where the tag 210 is an electronic tag, the tag can have a memory storing information relating to the filter 174, and a communication module including an antenna for communicating the information stored in the memory. The protective goggles 100 can then include a tag reader 212 mounted in a brow portion of the frame 102, e.g. as shown by the dashed lines in Fig. 3. The tag reader 212 is configured to read the information stored in the memory of the tag 210 when the filter is mounted in the filter cavity 178. For example, the tag reader 212 may comprise an antenna configured to communicate with the communication module in the tag 210. A controller of the protective goggles 100 (e g. the controller located in one of the compartments 126 mentioned above) is connected to the tag reader 212, and may be configured to control operation of the first and second air flow sources 120a, 120b based on information obtained from the tag 210 in the filter.

[0221] Fig. 18 shows a schematic diagram of control circuitry in the protective goggles 100 according to an example embodiment. The protective goggles 100 include the controller 214 for controlling operation of the air flow sources 120a, 120b. The controller 214 may include any suitable processing or computing device for controlling the air flow sources 120a, 120b. The controller 214 may, for example, be housed in one of the compartments 126 of the air flow sources, or mounted on a printed circuit board associated with one of the air flow sources. The controller 214 is connected to the tag reader 212 mentioned above, which is configured to wirelessly read information stored in the tag 210 in the filter 174 when the filter 174 is mounted in the frame 102. Additionally, a power source 216 is connected to the controller 214, and arranged to power the controller 214, the air flow sources 120a, 120b, and any other electrical components of the protective goggles 100 in use. In particular, the power source 216 provides power to the fan of each of the first and second air flow sources 120a, 120b. For example, the power source 216 can include one or more batteries located in the compartment 126 of one or both of the air flow sources. Additionally or alternatively, a battery may be provided in the filter 174. For example, a battery may be mounted in the filter holder 184, the battery being arranged to power the air flow sources 120a, 120b when the filter 174 is mounted in the filter cavity 178. In such a case, electrical connectors may be provided in the filter cavity 178 and extend within the frame 102 to electrically connect the battery in the filter 174 to the air flow sources 120a, 120b and / or the controller 214 when the filter 174 is mounted in the filter cavity 178. In other cases, the protective goggles 100 may be configured for use with an external power supply. In such a case, the power source 216 may comprise a connector for connecting the protective goggles to the external power supply. For example, the external power supply could include a battery pack, e.g. mounted on the strap 162 of the protective goggles or on a helmet worn by the user.

[0222] The tag 210 in the filter 174 can store various different types of information relating to the filter 174. Examples of information that can be stored by the tag 210 include authentication information, filter identification, filter type, filter liftetime, date of manufacture, operating parameters to be used with the filter, or similar. Using the tag reader 212, the controller 214 is configured to obtain the information from the tag 210, and control operation of the fan based on (as a function of) the information obtained from the tag, e.g. using a set of predetermined rules stored in a memory of the controller 214. In some cases, the controller 214 may be configured to verify an authenticity of the filter based on authentication information stored in the tag 210. The controller 214 may then be configured to only activate the air flow sources 120a, 120b if the filter 174 is successfully authenticated based on the authentication information obtained from the tag 210. As another example, the controller 214 may be configured to control a fan speed of the air flow sources 120a, 120b based on the information obtained from the tag 210. For example, the information stored in the tag 210 may include an indication of a fan speed which is to be used with that particular filter. Additionally or alternatively, different filter types (or filter identifiers) may be associated with different fan speeds in the memory of the controller 214, such that the controller 214 can select a fan speed based on a filter type determined from the information on the tag 210.

[0223] Where an indication of filter lifetime is stored in the memory of the tag 210, the controller 214 may be configured to monitor a usage time of the filter 174, i.e. an amount of time the air flow sources 120a, 120b are in operation whilst the filter 174 is mounted in the frame 102. If the usage time of the filter 174 exceeds the filter lifetime indicated in the tag 210, the controller 214 may be configured to generate an alert to notify the user that the filter 174 should be replaced. For example, the protective goggles 100 may comprise an alert module 218 display mounted in the frame 102 and connected to the controller 214, the alert module 218 being configured to generate an alert. For example, the alert module could comprise a display or a light source such as an LED mounted in the frame 102, to generate an alert visible by the wearer of the protective goggles 100. Additionally or alternatively, the alert module 218 may be configured to provide an audible alert and / or haptic alert. An alert generated by the alert module 218 can serve to notify the wearer that the filter 174 should be changed. In some cases, when the controller 214 determines that the lifetime of the filter 174 has been exceeded, the controller 214 may be configured to update the information stored in the tag 210 to include an indication that the filter 174 is used. For example, the tag reader 212 may be configured to communicate with the tag 210 to update the information stored in the memory of the tag 210. In this manner, the next time the tag reader 212 reads the tag 210, it can determine based on the information stored in the tag 210 that the filter is used 174 and should be changed. If the tag 210 of a filter 174 indicates that the filter 174 is used, the controller may be configured to generate an alert to notify the wearer that the filter should be changed, and / or the controller 214 may prevent the air flow sources 120a, 120b from being activated when the used filter is mounted.

[0224] Fig. 19 shows a perspective view of another example reinforcing structure 900 that can be used in the protective goggles 100 (i.e. instead of the reinforcing structure 148). Like the reinforcing structure 148 described above, the reinforcing structure 900 comprises a first exhaust component 902 and a second exhaust component 904, which are connected via a bridge portion 906. The first exhaust component 902 is mountable in the first opening 144 defined in the frame 102, and the second exhaust component 152 is mountable in the second opening 146 defined in the frame 102. The bridge portion 154 is shaped to pass over the wearer’s nose in use.

[0225] The reinforcing structure 900 further includes a first connector 908 and a second connector 910 arranged on either side of the bridge portion 906. For example, the first connector 908 is mounted next to the first exhaust component 902, and the second connector 910 is mounted next to the second exhaust component 904. A vision correction device 912 in the form of a set of spectacles is removably mountable to the first and second connectors 908, 910. A perspective view of the vision correction device 912 is shown on its own in Fig. 20. In particular, the vision correction device 912 comprises a pair of corrective lenses 914a, 914b which are held in a frame 916.

[0226] In the example shown, the frame 916 of the vision correction device 912 comprises a first mounting portion 918 provided under the first corrective lens 914a, the first mounting portion 918 being a post that is arranged to be received and held in the first connector 908. Likewise, the frame 916 comprises a second mounting portion 920 provided under the second corrective lens 914, the second mounting portion 920 being a post that is arranged to be received and held in the second connector 910. Thus, the first connector 908 and the second connector 910 may each comprise respective holders (e.g. channels) for holding the mounting portions 918, 920, respectively.

[0227] Accordingly, the vision correction device 912 can be removably mounted to the reinforcing structure 900. When the vision correction device 912 is mounted to the reinforcing structure 900, the vision correction device is located in the ocular space 108 in front of the wearer’s eyes.

[0228] Fig. 21 shows a perspective view of a filter holder 950 and a visor 952 that can be used in the protective goggles 100 (i.e. instead of the filter holder 184 and the visor 104 described above). For illustration purposes, other parts of the protective goggles 100 are not shown in Fig. 21 . The filter holder 950 has all of the features of the filter holder 184 described above. Additionally, a front surface of the filter holder 950 comprises an engagement portion in the form of a protruding post 954. The post 954 is configured to be received in an engagement feature in the form of a notch (or groove) 956 provided in an upper edge of the visor 952 when the filter holder 950 is mounted in the filter cavity 178 of the frame 102. The post 954 is arranged to be held (retained) in the in the notch 956, such that a user must exert a certain amount of force to disengage the post 954 from the notch 956. For example, a snap-fit connection may be formed between the post 954 and the notch 956. In Fig. 21 , the post 954 is shown as engaged in the notch 956.

[0229] When the filter holder 950 is mounted in the filter cavity 178 of the frame 102, engagement of the post

[0230] 954 in the notch 956 may cause a portion of the frame 102 to be compressed between filter holder 950 and the visor 952. In other words, the filter holder 950 may press the frame 102 against the upper edge of the visor 952, which may enhance a strength of the seal between the frame 102 and the visor 952.

[0231] In some cases, there may be multiple points of connection between the filter holder 950 and the visor 952. For example, the filter holder 950 may comprise multiple posts 954, with the visor 952 comprise multiple notches 956, each arranged to receive a respective post 954. Of course, other arrangement or means for connecting the filter holder 950 to the visor 952 may also be used. For instance the location of the post(s) 954 and the notch(es) 956 may be reversed.

[0232] In the example shown, the visor 952 further includes a series of engagement features in the form of tabs 958 arranged along its upper edge. Such engagement features may serve to enhance a connection between the visor 952 and the frame 102. For example, a shape of the groove 110 in the frame 102 in which the visor 952 is received may be adapted (e.g. complementary) to the shape of the tabs 958. The frame 102 may then need to be stretched to fit the tabs 958 into the groove 110, which may avoid the visor 952 falling out of the groove 110. In this manner, the tabs 958 may interlock with the frame 102. Although the tabs 958 are shown along the upper edge of the visor 952 they may be provided at different or further locations around edges of the visor 952. Such tabs 958 may be included in the visor 104 described above.

[0233] The features disclosed in the foregoing description, or in the following claims, or in the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for obtaining the disclosed results, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof.

[0234] While the invention has been described in conjunction with the exemplary embodiments described above, many equivalent modifications and variations will be apparent to those skilled in the art when given this disclosure. Accordingly, the exemplary embodiments of the invention set forth above are considered to be illustrative and not limiting. Various changes to the described embodiments may be made without departing from the spirit and scope of the invention.

[0235] For the avoidance of any doubt, any theoretical explanations provided herein are provided for the purposes of improving the understanding of a reader. The inventors do not wish to be bound by any of these theoretical explanations.

[0236] Any section headings used herein are for organizational purposes only and are not to be construed as limiting the subject matter described.

[0237] Throughout this specification, including the claims which follow, unless the context requires otherwise, the word “comprise” and “include”, and variations such as “comprises”, “comprising”, and “including” will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

[0238] It must be noted that, as used in the specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from “about” one particular value, and / or to “about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by the use of the antecedent “about,” it will be understood that the particular value forms another embodiment. The term “about” in relation to a numerical value is optional and means for example + / - 10%.

[0239] Additional aspects and / or embodiments of the present invention are set out in the following sets of numbered clauses. The section headings below are for organizational purposes only and are not to be construed as limiting the subject matter described.

[0240] 1. Protective aoqqles frame and seal

[0241] 1 . Protective goggles comprising: a frame; a visor connected to the frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer, wherein the sealing arrangement and the frame are integrally formed as a single piece of material; and an air flow source configured to generate an air flow into an ocular space defined by the protective goggles.

[0242] 2. Protective goggles according to clause 1 , further comprising a strap for securing the protective goggles to a head of the wearer, wherein the strap is connected to the visor.

[0243] 3. Protective goggles according to clause 2, wherein the visor comprises a first connection region disposed towards a first end of the visor and to which a first end of the strap is connected, and a second connection region disposed towards a second end of the visor and to which a second end of the strap is connected.

[0244] 4. Protective goggles according to clause 3, wherein the first connection region and the second connection region protrude from a surface of the frame.

[0245] 5. Protective goggles according to any preceding clause, wherein the single piece of material is an elastomeric material.

[0246] 6. Protective goggles according to clause 5, wherein the elastomeric material has a Shore A hardness of 70 or less.

[0247] 7. Protective goggles according to any preceding clause, wherein: the frame has a first opening; a first exhaust component is mounted in the first opening of the frame to define a first exhaust outlet of the protective goggles; and a material of the first exhaust component has a greater hardness than the material of the frame. 8. Protective goggles according to clause 7, wherein: the first opening is arranged to be located under a left eye of the wearer, and the frame further comprises a second opening arranged to be located under a right eye of the wearer; a second exhaust component is mounted in the second opening of the frame to define a second exhaust outlet of the protective goggles; and a material of the second exhaust component has a greater hardness than the material of the frame.

[0248] 9. Protective goggles according to clause 8, wherein the first exhaust component and the second exhaust component are connected by a bridge portion arranged to pass over a nose of the wearer, the bridge portion having a greater hardness than the material of the frame.

[0249] 10. Protective goggles according to clause 9, wherein the first exhaust component, the second exhaust component and the bridge portion are integrally formed as a single piece of material.

[0250] 11 . Protective goggles according to clause 9 or 10, wherein the bridge portion comprises a connector for detachable connection to a mask arranged to cover the wearer’s nose and mouth.

[0251] 12. Protective goggles according to one of clauses 8 to 11 , wherein the first exhaust component and / or the second exhaust component comprises one or more drainage channels for draining fluid out of the protective goggles.

[0252] 13. Protective goggles according to any preceding clause, wherein the air flow source is mounted in a cavity defined in the frame.

[0253] 14. Protective goggles according to clause 13, wherein the air flow source is retained in the cavity by friction with the frame.

[0254] 15. Protective goggles according to clause 13 or 14, wherein an air flow channel is defined in the frame, the air flow channel being in fluid communication with an inlet of the air flow source, and wherein the air flow source is configured to draw air via the air flow channel to generate the air flow into the ocular space.

[0255] 16. Protective goggles according to one of clauses 13 to 15, wherein a power source and / or controller of the air flow source is further provided in the cavity with the air flow source.

[0256] 17. Protective goggles according to one of clauses 13 to 16, wherein the cavity is defined in a side wing portion of the frame.

[0257] 18. Protective goggles according to clause 17, further comprising a second air flow source configured to generate a second air flow into the ocular space, the second air flow source being mounted in a second cavity defined in the frame, wherein the second cavity is defined in a second side wing of the frame.

[0258] 19. Protective goggles according to any preceding clause, further comprising a filter configured to filter air in the air flow generated by the air flow source, wherein the filter is mounted in a cavity defined in the frame; optionally wherein the filter is removably mounted in the cavity.

[0259] 20. Protective goggles according to clause 19, wherein the filter comprises a filter holder that contains a filter medium, the filter holder being formed of a material having a greater hardness than the material of the frame.

[0260] 21 . A respirator comprising: protective goggles according to claim 11 ; and a mask for covering the wearer’s nose and mouth; wherein the mask is detachably connectable to the connector in the bridge portion.

[0261] 21. A method of producing protective goggles, the method comprising: integrally forming a frame and a sealing arrangement as a single piece of material, wherein the sealing arrangement is configured to provide a seal between the frame and a face of a wearer; connecting a visor to the frame; and providing an air flow configured to generate an air flow into an ocular space defined by the protective goggles.

[0262] 2. Filter

[0263] 1 . Protective goggles comprising: a frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a visor connected to the frame; an air flow source configured to generate an air flow into an ocular space defined by the protective goggles; and a filter configured to filter air in the air flow generated by the air flow source, wherein the filter is mounted in a brow portion of the frame.

[0264] 2. Protective goggles according to clause 1 , wherein the filter extends along the brow portion of the frame from a first side wing portion of the frame to a second side wing portion of the frame.

[0265] 3. Protective goggles according to clause 2, wherein the air flow source is located in the first side wing portion of the frame, and the filter includes a first outlet arranged at a first end of the filter adjacent the first side wing portion, and wherein the first outlet of the filter is in fluid communication with an inlet of the air flow source.

[0266] 4. Protective goggles according to clause 3, further comprising a second air flow source located in the second side wing portion of the frame, the second air flow source being configured to generate an air flow into an ocular space defined by the protective goggles, wherein the filter includes a second outlet arranged at a second end of the filter adjacent the second side wing portion, and wherein the second outlet of the filter is in fluid communication with an inlet of the second air flow source.

[0267] 5. Protective goggles according to clause 3, wherein the filter comprises a first plurality of air inlets arranged between a central portion of the filter and the first end of the filter, wherein the first plurality of air inlets are arranged in order of increasing size from the first end to the central portion; and / or protective goggles according to clause 4, wherein the filter comprises a second plurality of air inlets arranged between the central potion of the filter and the second end of the filter, wherein the second plurality of air inlets are arranged in order of increasing size from the second end to the central portion.

[0268] 6. Protective goggles according to any preceding clause, wherein the filter is removably mounted in a cavity defined in the brow portion of the frame.

[0269] 7. Protective goggles according to clause 6, wherein the filter is retained in the cavity by friction with the frame.

[0270] 8. Protective goggles according to clause 6 or 7, wherein the filter comprises a filter holder that contains a filter medium, the filter holder being mountable in the cavity.

[0271] 9. Protective goggles according to clause 8, wherein the filter holder is formed of a material having a greater hardness than a material of the frame.

[0272] 10. Protective goggles according to clause 8 or 9, wherein the filter medium is bonded to the filter holder.

[0273] 11 . Protective goggles according to one of clauses 8 to 10, wherein a power source is attached to the filter holder, the power source being configured to power the air flow source when the filter is mounted in the cavity.

[0274] 12. Protective goggles according to one of clauses 6 to 12, wherein the filter comprises a tag, and the frame comprises a tag reader configured to obtain information from the tag when the filter is mounted in the cavity. 13. Protective goggles according to clause 12, further comprising a controller configured to control operation of the air flow source based on the information obtained from the tag by the tag reader.

[0275] 14. Protective goggles according to clause 12 or 13, wherein: the tag is an electronic tag; and a controller is configured to determine when a usage time of the filter exceeds a predetermined threshold and, in response to determining that the usage time of the filter exceeds the predetermined threshold, update information stored in the tag.

[0276] 15. A filter for protective goggles, the filter comprising a filter holder containing a filter medium, wherein: the filter holder is configured to be mounted in a brow portion of a frame of the protective goggles; the filter holder includes a first outlet arranged at a first end of the filter holder, the first outlet being arranged for fluid communication with a first air flow source in a first side wing of the frame when the filter holder is mounted in the frame; and optionally the filter holder includes a second outlet arranged at a second end of the filter holder, the second outlet being arranged for fluid communication with a second air flow source in a second side wing of the frame when the filter holder is mounted in the frame.

[0277] 1 . Protective goggles comprising: a frame; a visor connected to the frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a first air flow source arranged in a first side wing portion of the frame, the first air flow source being configured to generate a first air flow air flow into an ocular space defined by the protective goggles; a second air flow source arranged in a second side wing portion of the frame, the second air flow source being configured to generate a second air flow air flow into the ocular space; and an air intake in a brow portion of the frame, wherein the first air flow source and the second air flow source are each configured to draw air from the air intake to generate the first air flow and the second air flow, respectively.

[0278] 2. Protective goggles according to clause 1 , wherein the first air flow source is configured to direct the first air flow onto a first portion of an inner surface of the visor, and the second air flow source is configured to direct the second air flow onto a second portion of the inner surface of the visor.

[0279] 3. Protective goggles according to clause 2, wherein an outlet of the first air flow source comprises a first nozzle for directing the first air flow onto the first portion of the inner surface of the visor, and the second air flow source comprises a second nozzle for directing the second air flow onto the second portion of the inner surface of the visor.

[0280] 4. Protective goggles according to any preceding clause, wherein the air intake comprises a filter mounted in the brow portion of the frame, the filter being arranged to filter air drawn via the air intake.

[0281] 5. Protective goggles according to clause 4, wherein the filter comprises one or more air inlets, a first air outlet arranged towards a first end of the filter and in fluid communication with the first air flow source, and a second air outlet arranged towards a second end of the filter and in fluid communication with the second air flow source.

[0282] 6. Protective goggles according to any preceding clause, wherein a first air flow channel defined in the frame fluidly connects the air intake to the first air flow source, and a second air flow channel defined in the frame fluidly connects the air intake to the second air flow source.

[0283] 7. Protective goggles according to any preceding clause, wherein the frame comprises one or more exhaust outlets to allow air to flow out of the ocular space.

[0284] 8. Protective goggles according to clause 7, wherein the one or more exhaust outlets comprise a first exhaust outlet arranged to be located under a left eye of the wearer, and a second exhaust outlet arranged to be located under a right eye of the wearer.

[0285] 9. Protective goggles according to clause 7 or 8, wherein each of the one or more exhaust outlets comprises a plurality of apertures, and a filter material covering the plurality of apertures.

[0286] 10. Protective goggles according to any preceding clause, wherein the first air flow source comprises a first radial fan, and / or wherein the second air flow source comprises a second radial fan.

Claims

Claims:

1. Protective goggles comprising: a frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a visor connected to the frame; an air flow source configured to generate an air flow into an ocular space defined by the protective goggles; and a filter configured to filter air in the air flow generated by the air flow source, wherein the filter is mounted in a brow portion of the frame.

2. Protective goggles according to claim 1 , wherein the filter extends along the brow portion of the frame from a first side wing portion of the frame to a second side wing portion of the frame.

3. Protective goggles according to claim 2, wherein the air flow source is located in the first side wing portion of the frame, and the filter includes a first outlet arranged at a first end of the filter adjacent the first side wing portion, and wherein the first outlet of the filter is in fluid communication with an inlet of the air flow source.

4. Protective goggles according to claim 3, further comprising a second air flow source located in the second side wing portion of the frame, the second air flow source being configured to generate an air flow into an ocular space defined by the protective goggles, wherein the filter includes a second outlet arranged at a second end of the filter adjacent the second side wing portion, and wherein the second outlet of the filter is in fluid communication with an inlet of the second air flow source.

5. Protective goggles according to claim 3, wherein the filter comprises a first plurality of air inlets arranged between a central portion of the filter and the first end of the filter, wherein the first plurality of air inlets are arranged in order of increasing size from the first end to the central portion; and / or protective goggles according to claim 4, wherein the filter comprises a second plurality of air inlets arranged between the central potion of the filter and the second end of the filter, wherein the second plurality of air inlets are arranged in order of increasing size from the second end to the central portion.

6. Protective goggles according to any preceding claim, wherein the filter is removably mounted in a cavity defined in the brow portion of the frame.

7. Protective goggles according to claim 6, wherein the filter is retained in the cavity by friction with the frame.

8. Protective goggles according to claim 6 or 7, wherein the filter is configured to engage the visor when the filter is mounted in the cavity.

9. Protective goggles according to one of claims 6 to 8, wherein the filter comprises a filter holder that contains a filter medium, the filter holder being mountable in the cavity.

10. Protective goggles according to claim 9, wherein the filter holder is formed of a material having a greater stiffness than a material of the frame.11 . Protective goggles according to claim 9 or 10, wherein the filter medium is bonded to the filter holder.

12. Protective goggles according to one of claims 9 to 11 , wherein a power source is attached to the filter holder, the power source being configured to power the air flow source when the filter is mounted in the cavity.

13. Protective goggles according to one of claims 6 to 12, wherein the filter comprises a tag, and the frame comprises a tag reader configured to obtain information from the tag when the filter is mounted in the cavity.

14. Protective goggles according to claim 13, further comprising a controller configured to control operation of the air flow source based on the information obtained from the tag by the tag reader.

15. Protective goggles according to claim 13 or 14, wherein: the tag is an electronic tag; and a controller is configured to determine when a usage time of the filter exceeds a predetermined threshold and, in response to determining that the usage time of the filter exceeds the predetermined threshold, update information stored in the tag.

16. A filter for protective goggles, the filter comprising a filter holder containing a filter medium, wherein: the filter holder is configured to be mounted in a brow portion of a frame of the protective goggles; the filter holder includes a first outlet arranged at a first end of the filter holder, the first outlet being arranged for fluid communication with a first air flow source in a first side wing of the frame when the filter holder is mounted in the frame; and optionally the filter holder includes a second outlet arranged at a second end of the filter holder, the second outlet being arranged for fluid communication with a second air flow source in a second side wing of the frame when the filter holder is mounted in the frame.

17. Protective goggles comprising: a frame; a visor connected to the frame;a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a first air flow source arranged in a first side wing portion of the frame, the first air flow source being configured to generate a first air flow air flow into an ocular space defined by the protective goggles; a second air flow source arranged in a second side wing portion of the frame, the second air flow source being configured to generate a second air flow air flow into the ocular space; and an air intake in a brow portion of the frame, wherein the first air flow source and the second air flow source are each configured to draw air from the air intake to generate the first air flow and the second air flow, respectively.

18. Protective goggles according to claim 17, wherein the first air flow source is configured to direct the first air flow onto a first portion of an inner surface of the visor, and the second air flow source is configured to direct the second air flow onto a second portion of the inner surface of the visor.19 Protective goggles according to claim 18, wherein an outlet of the first air flow source comprises a first nozzle for directing the first air flow onto the first portion of the inner surface of the visor, and the second air flow source comprises a second nozzle for directing the second air flow onto the second portion of the inner surface of the visor.

20. Protective goggles according to one of claims 17 to 19, wherein the air intake comprises a filter mounted in the brow portion of the frame, the filter being arranged to filter air drawn via the air intake.

21. Protective goggles according to claim 20, wherein the filter comprises one or more air inlets, a first air outlet arranged towards a first end of the filter and in fluid communication with the first air flow source, and a second air outlet arranged towards a second end of the filter and in fluid communication with the second air flow source.

22. Protective goggles comprising: a frame; a visor connected to the frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer, wherein the sealing arrangement and the frame are integrally formed as a single piece of material; and an air flow source configured to generate an air flow into an ocular space defined by the protective goggles.

23. Protective goggles according to claim 22, further comprising a strap for securing the protective goggles to a head of the wearer, wherein the strap is connected to the visor.

24. Protective goggles according to claim 23 further comprising a connector part secured to the visor, wherein the strap is attached to the connector part.

25. Protective goggles according to claim 23 or 24, wherein the visor comprises a first connection region disposed towards a first end of the visor and to which a first end of the strap is connected, and a second connection region disposed towards a second end of the visor and to which a second end of the strap is connected.

26. Protective goggles according to claim 25, wherein the first connection region and the second connection region protrude from a surface of the frame.

27. Protective goggles according to one of claims 22 to 26, wherein the single piece of material is an elastomeric material; and optionally wherein the elastomeric material has a Shore A hardness of 70 or less.

28. Protective goggles comprising: a frame; a sealing arrangement configured to provide a seal between the frame and a face of a wearer; a visor connected to the frame; an air flow source configured to generate an air flow into an ocular space defined by the protective goggles; and an insert mounted in an opening or cavity formed in the frame; wherein the insert has a greater hardness that a material of the frame, and the insert comprises a connector for mounting a vision correction device in the ocular space.

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