Abstract: A headset, comprising: first and second ear cups, and a power and signal connector that extends between the ear cups, wherein each ear cup comprises a housing having a mounting structure for mounting the ear cup on a wearable support; a speaker; and a speaker drive circuit for operating the speaker. The first ear cup further comprises: an external power and signal connector; and a mounting structure having a first profile for mounting a removable control module having a corresponding first profile on the first ear cup such that corresponding power and signal connectors can engage the external power and signal connector so that the removable control module can provide operating signals to the speaker drive circuits.

Abstract: A full face respirator comprising a mask (10) having a transparent viewing portion (12) and a port portion (16), and exhalation port (22) disposed in said port portion (16), a face seal configured (14) to seal the mask (10) over a wearer's eyes, nose and mouth, in use, and an orinasal assembly (2) including a flexible, cup-shaped orinasal (2) having an orifice (2a) and being configured to fit over a wearer's nose and mouth, in use; wherein the orinasal assembly (2) further includes generally tubular connecting portion (24), integrally formed with and extending outwardly from the periphery of the orifice (2a), the connection portion (24) being shaped and configured to extend through the exhalation port (22) from the inner region to the outer region of the mask (10) and including an exhalation valve mount (28) for receiving a one-way exhalation valve (4).

Abstract: A disc filter frame including a base member and a lever, said base member including, adjacent a first end thereof, a breathing aperture and a connection arrangement configured to connect to a respiratory device, said breathing aperture and connection arrangement being aligned so as to define an airflow channel therebetween; said lever being hingedly connected by a hinge mechanism at its proximal end to said base at said first end and including a sealing member shaped and configured to cover said breathing aperture, the lever being biased in a first position and selectively movable to a second position in which said sealing member seals said breathing aperture, the distal end of said lever being located and spaced apart from adjacent a second, opposing end of said base and configured to be manually pressed to move said sealing member from said first position to said second position.

Abstract: A chinstrap harness for a safety helmet, the chinstrap harness comprising first and second elongate side sections of flexible material (12a, 12b, 12c), each side section having a first end and an opposing second end, wherein said first end comprises means (3a, 3b) to connect said chinstrap harness to a safety helmet, and the opposing second end of each side section includes means (1) for releasably coupling said side sections adjacent a user's face.

Abstract: A fold flat personal respiratory device comprising: a generally planar central panel (10) including a layer of filter media and having opposing first and second side edges (12a, 12b) and first and second end edges (11); a first side panel joined to said central panel (10) along said first side edge (12a); a second side panel joined to said central panel (10) along said second side edge (12b); the device being manually configurable from a folded configuration in which said side panels (12a, 12b) are substantially parallel to a planar surface of said central panel (10) and an operational configuration in which said central (10) and first and second side panels (12a, 12b) form a cup-shaped respiratory chamber; the device further comprising a rigid or semi-rigid endoskeleton member (36) mounted along a planar surface of said central panel (10) and extending between said first and second side edges (12a, 12b) and/or said first and second end edges (11).

Abstract: A headset, comprising: first and second ear cups, and a power and signal connector that extends between the ear cups, wherein each ear cup comprises a housing having a mounting structure for mounting the ear cup on a wearable support; a speaker; and a speaker drive circuit for operating the speaker. The first ear cup further comprises: an external power and signal connector; and a mounting structure having a first profile for mounting a removable control module having a corresponding first profile on the first ear cup such that corresponding power and signal connectors can engage the external power and signal connector so that the removable control module can provide operating signals to the speaker drive circuits.

Abstract: A visor carrier assembly for a safety helmet includes a double-pivot mechanism attachable to each side of a safety helmet and configured to enable a visor to be selectively pivoted. An elongate arm of the double-pivot mechanism includes first and second pivotal couplings, each including a coupling member being a fixed elongate pin having rounded portions at each end, and a coupling region including an aperture defining, along its inner edge, a first notch or aperture within which one of the rounded portions of a respective coupling member is received to define a fixed pivot point, and an arcuate guide wall with which the opposite rounded portion of said respective coupling member engages and having ridges defining grooves or notches for receiving the opposite rounded portion as a respective pivotal coupling is pivoted about the fixed pivot point, each groove or notch defining a respective said visor position.

Abstract: A visor carrier assembly for a safety helmet, comprising: a visor; and an attachment device for attaching the visor to a safety helmet for use, the attachment device including a double-pivot mechanism attachable to each side of a safety helmet and configured to enable the visor to be selectively pivoted relative to said safety helmet, in use, between at least first, second and third visor positions, each double-pivot mechanism comprising an elongate arm, said elongate arm being coupled, by a first pivotal coupling at one end thereof, to a respective side region of the visor and coupled, by a second pivotal coupling at a longitudinally opposing second end thereof, to a fixed point, in use, at a respective side of said safety helmet, each pivotal coupling comprising a coupling member and a coupling region, each coupling member comprising a fixed elongate pin having rounded portions at each end, each coupling region comprising an aperture defining, along its inner edge, a first notch or aperture within which one

Abstract: A disc filter frame comprising a base member and a lever, said base member including, adjacent a first end thereof, a breathing aperture and a connection arrangement configured to connect to a respiratory device, said breathing aperture and connection arrangement being aligned so as to define an airflow channel therebetween; said lever being hingedly connected by a hinge mechanism at its proximal end to said base at said first end and including a sealing member shaped and configured to cover said breathing aperture, the lever being biased in a first position in which a gap is defined between said sealing member and said breathing aperture, and selectively movable to a second position in which said sealing member seals said breathing aperture, the distal end of said lever being located and spaced apart from adjacent a second, opposing end of said base and configured to be manually pressed to move said sealing member from said first position to said second position.

Abstract: A full face respirator comprising a mask (10) having a transparent viewing portion (12) and a port portion (16), and exhalation port (22) disposed in said port portion (16), a face seal configured (14) to seal the mask (10) over a wearer's eyes, nose and mouth, in use, and an orinasal assembly (2) comprising a flexible, cup-shaped orinasal (2) having an orifice (2a) and being configured to fit over a wearer's nose and mouth, in use; wherein the orinasal assembly (2) further comprises a generally tubular connecting portion (24), integrally formed with and extending outwardly from the periphery of said orifice (2a), said connection portion (24) being shaped and configured to extend through said exhalation port (22) from the inner region to the outer region of the mask (10) and including an exhalation valve mount (28) for receiving a one-way exhalation valve (4).

Abstract: A fold flat personal respiratory device comprising: a generally planar central panel (10) including a layer of filter media and having opposing first and second side edges (12a, 12b) and first and second end edges (11); a first side panel joined to said central panel (10) along said first side edge (12a); a second side panel joined to said central panel (10) along said second side edge (12b); the device being manually configurable from a folded configuration in which said side panels (12a, 12b) are substantially parallel to a planar surface of said central panel (10) and an operational configuration in which said central (10) and first and second side panels (12a, 12b) form a cup-shaped respiratory chamber; the device further comprising a rigid or semi-rigid endoskeleton member (36) mounted along a planar surface of said central panel (10) and extending between said first and second side edges (12a, 12b) and/or said first and second end edges (11).

Abstract: A powered air respirator kit comprising visor (9) removably attachable to a front edge of a safety helmet (4), a drive unit (1) removably attachable to said safety helmet (4), at least one filter module removably attachable to said safety helmet such that, in use, a fluid flow path is defined through said filter module to a space defined between a user's face and an inner surface of said visor, the kit further comprising a power module (10) removably attachable to said safety helmet and, in use, electrically connectable to said drive unit (1).

Abstract: A liner (10) for fitting within a headcap to provide a degree of impact protection, said liner comprising a generally concave shell for receiving a wearer's head, in use, and having a top section (16), a front section (12) and a rear section (14), and a pair of side panels extending downward from, and integrally formed with, respective side edges of said top section (16), wherein a first slot (14a) is provided on each side of said rear section (14), extending from a side edge thereof to a hinge portion (14b) located between said top portion (16) and said rear section (14), and a second slot (12a) is provided on each side of said front section (12) extending from a side edge thereof to a hinge portion (12b) located between said top portion (16) and said front section (12).

Abstract: A chinstrap harness for a safety helmet, the chinstrap harness comprising first and second elongate side sections of flexible material (12a, 12b, 12c), each side section having a first end and an opposing second end, wherein said first end comprises means (3a, 3b) to connect said chinstrap harness to a safety helmet, and the opposing second end of each side section includes means (1) for releasably coupling said side sections adjacent a user's face.

Abstract: A powered air respirator kit comprising visor (9) removably attachable to a front edge of a safety helmet (4), a drive unit (1) removably attachable to said safety helmet (4), at least one filter module removably attachable to said safety helmet such that, in use, a fluid flow path is defined through said filter module to a space defined between a user's face and an inner surface of said visor, the kit further comprising a power module (10) removably attachable to said safety helmet and, in use, electrically connectable to said drive unit (1).

Abstract: A liner (10) for fitting within a headcap to provide a degree of impact protection, said liner comprising a generally concave shell for receiving a wearer's head, in use, and having a top section (16), a front section (12) and a rear section (14), and a pair of side panels extending downward from, and integrally formed with, respective side edges of said top section (16), wherein a first slot (14a) is provided on each side of said rear section (14), extending from a side edge thereof to a hinge portion (14b) located between said top portion (16) and said rear section (14), and a second slot (12a) is provided on each side of said front section (12) extending from a side edge thereof to a hinge portion (12b) located between said top portion (16) and said front section (12).

Abstract: A filter cartridge for a respiratory mask includes a housing comprised of an inner receptacle having an open end and an outer cover mounted over said open end of said inner receptacle. The outer cover includes, in a covering surface thereof, an air intake aperture in fluid communication with said inner receptacle. The outer cover is pivotally mounted to the inner receptacle and configured for pivotal movement relative thereto between a first configuration in which there is a gap between said open end of said inner receptacle and said outer cover such that a respiratory airway is defined between said intake aperture and said inner receptacle, and a second configuration in which said outer cover substantially seals said open end of said inner receptacle and said respiratory airway is thereby blocked.

Abstract: A filter cartridge for a respiratory mask includes a housing comprised of an inner receptacle having an open end and an outer cover mounted over said open end of said inner receptacle. The outer cover includes, in a covering surface thereof, an air intake aperture in fluid communication with said inner receptacle. The outer cover is pivotally mounted to the inner receptacle and configured for pivotal movement relative thereto between a first configuration in which there is a gap between said open end of said inner receptacle and said outer cover such that a respiratory airway is defined between said intake aperture and said inner receptacle, and a second configuration in which said outer cover substantially seals said open end of said inner receptacle and said respiratory airway is thereby blocked.

Abstract: A filter cartridge for a respiratory mask includes a housing comprised of an inner receptacle having an open end and an outer cover mounted over said open end of said inner receptacle. The outer cover includes, in a covering surface thereof, an air intake aperture in fluid communication with said inner receptacle. The outer cover is pivotally mounted to the inner receptacle and configured for pivotal movement relative thereto between a first configuration in which there is a gap between said open end of said inner receptacle and said outer cover such that a respiratory airway is defined between said intake aperture and said inner receptacle, and a second configuration in which said outer cover substantially seals said open end of said inner receptacle and said respiratory airway is thereby blocked.