Abstract: A light weight headphone insertable into a human ear canal having a curved portion leading to the ear drum. A main body element having a passageway through the main body element. An elongated hollow stem having two ends, one end attached to the passageway in the main body, the other end terminating in a handle. A speaker located in the handle and sound transmitted from the speaker through the hollow stem and the main body to the ear canal. The hollow stem member having a portion with a wavy configuration. Rotation of the hollow stem member will fit the hollow stem member around the curved portion in the human ear canal and seat the main body deeply in the ear canal to acoustically block the ear canal from outside noise and transmit the sound from the speaker in close proximity to the ear drum.

Abstract: A clamp for adjustably joining the ends of a strap having ends. The clamp has top and bottom members, and at least one of the top and bottom members has a groove extending from one side to the other side of the clamp. The groove receives the ends of the strap so first portions of the ends of the strap are within the groove and at least one other second portion of the strap extends outward from the sides of the clamp. Complementary aligning portions are located on the top and bottom members to align the top and bottom members to capture the first portions of the ends of the strap by friction within the groove formed within the clamp. The length of the strap is adjusted by the second portion of the strap that extend outward from the sides of the clamp.

Abstract: The present invention relates to a filter material for respirator masks. The filter material comprises a filter material layer that is pleated so as to form a plurality of folds, said filter material layer comprising a filter layer and a first netting layer. The invention is characterized in that the filter material layer comprises a second netting layer disposed on the filter layer on the side opposite to said first netting layer. The invention additionally relates to a respirator mask comprising such a filter material.

Abstract: A foldable breathing mask formed with a deep-drawn mask body and sufficiently rigid so as to retain its shape and including at least one fold line for a storage folding of the mask body is a predefined manner.

Abstract: A multi-piece dual mode headphone, including: a molded elongated member, a rear molded insert member and an intermediate member all together forming a headphone with a channel extending through the interior of the headphone. A small speaker for transmitting sound energy is positioned in the headphone to direct the sound energy through the channel to the eardrum. The molded rear insert member includes a cap member and with positioning of the cap member providing for the headphone being in a first mode of operation where the channel extending through the interior of the headphone is open and a second mode of operation where the channel extending through the interior of the headphone is closed.

Abstract: The invention relates to a filter cartridge for an air filtering device, in particular for a filtering face mask and a method for manufacturing a filter cartridge, comprising a stiff cup-shaped casing having a bottom and a circumferential sidewall extending at least section-wise parallel to one axis, a stiff discoidal lid and a filter bed of loose filter material compressed between the lid and the casing, the lid and the bottom containing each at least one through-hole so that air to be filtered passes through the filter bed, and at least one of the lid and the bottom being curved to at least one direction, whereby the lid is at least essentially arranged within the casing, the outermost contour of the lid close-fitting to the inner contour of the sidewall, and fixed thereto by a direct connection, particularly by a non-detachable connection.

Abstract: A respirator mask and a method of making the respirator mask that includes a lens member and a plurality of buckle members spaced around the lens member. A flange member is overmolded to the lens member and to the spaced buckle members at the same time by the following method. A mold member is provided to have individual mold supports to individually receive and support the lens member and to individually receive and support the buckle members at the spaced positions around the lens member. The mold member forms a flange cavity around the lens member and extending to the buckle members. The lens member is positioned within its individual mold support and the buckle members are positioned within their individual mold supports at the spaced positions around the lens member. The molding material is then injected into the flange cavity to form a flange that overmolds to the lens member while at the same time overmolds to the buckle members to form the respirator mask.

Abstract: A uni-directional valve for an air path of a ventilation device. A flexible valve element is held biased in a housing of the uni-directional valve to close at least one air passage located in a sealing section and with a sealing portion to at least partially open the air passage if the valve element is impinged by a sufficient air pressure against the bias. The valve element is designed as cylinder and the sealing portion is located on the lateral surface of the cylinder. The sealing portion is located opposite to a support portion located on the lateral surface of the cylinder. The support portion interacts with a support section of the housing. The distance between the support section and the sealing section of the housing is smaller than the distance between the support portion and the sealing portion in the unbiased state of the valve element.

Abstract: The invention relates to a breathing mask, in particular for human beings, comprising a flexible mask body designed to fit over a mouth and nose on a user's face, at least one sealing lip for a gas-proof fit on the user's face, comprising at least one inhalation valve penetrating the mask body, a filter material assigned to the inhalation valve and an exhalation valve penetrating the mask body. It is intended that a manually actuable test valve is arranged downstream of the exhalation valve and designed to provide a gas passage from the exhalation valve to the surroundings in its normal state and to close said passage in its actuated state.

Abstract: The present invention relates to a filter material for respirator masks. The filter material comprises a filter material layer that is pleated so as to form a plurality of folds, said filter material layer comprising a filter layer and a first netting layer. The invention is characterized in that the filter material layer comprises a second netting layer disposed on the filter layer on the side opposite to said first netting layer. The invention additionally relates to a respirator mask comprising such a filter material.

Abstract: An apparatus and a method of making a corded earplug, including a flexible cord material having a particular cross-section. An earplug having a nose portion for insertion into the ear and a handle portion extending from the nose portion and lying outside of the ear when the nose portion is inserted into the ear. The handle portion including at least two openings physically displaced from each other. At least one of the openings extends within the handle portion and with at least one of the openings having a cross-section different than the cross-section of the cord material. An end portion of the flexible cord material is inserted into the at least one opening extending within the handle portion.

Abstract: An apparatus and a method of making a corded earplug, including a flexible cord material and a pair of earplugs. Each earplug has a nose portion for insertion into the ear and a rear portion extending from the nose portion and lying outside of the ear when the nose portion is inserted into the ear. Each rear portion has a pair of openings physically displaced from each other and/or angularly displaced from each other. At least one of the openings extends through the rear portion. A short portion of the flexible cord material is inserted through the at least one opening extending through the rear portion. The short portion of the flexible cord material is then inserted into the other opening to have the short portion of the flexible cord material physically displaced and/or angularly displaced along its length to lock the flexible cord material to the rear portion of the earplug.

Abstract: A hearing protective earplug for insertion into the human ear canal of a user where the human ear canal has sidewalls and a typical curved portion. A soft resilient body has a main body element with a front end for insertion in the human ear canal. An elongated stem has two ends with one end attached to the main body element. The stem extends outward from the main body element and away from the front end. The other end of the stem forms a handle portion of the stem. The stem is sufficiently stiff as to allow manipulation of the main body element into the ear canal of the user. The stem member has a crooked or wavy configuration within the ear canal as it extends outward from the main body to the handle portion of the stem. As the front end of the main body element is inserted into the ear canal, the stem member is rotated during insertion with the handle portion to fit around the typical curved portion in the human ear canal.