The present application discloses a lockable fitting structure used for an electric air-purifying respirator of an auto-darkening welding helmet, the electric air-purifying respirator comprising a housing and a battery device, a battery holder being formed in the housing, and the battery device being able to be detachably installed in the battery holder by the lockable fitting structure, wherein the lockable fitting structure comprises at lease four pairs of sliding joint structures formed on the battery device and the battery holder respectively and a locking structure provided in the battery device, wherein the sliding joint structures of each pair can be engaged with or disengaged from each other by sliding them relative to each other, wherein the locking structure comprises a button and a tongue capable to be actuated by the button, wherein the tongue is movable along a direction substantially perpendicular to a sliding direction of the sliding joint structure, and wherein after the sliding joint structures have been moved relative to each other in place, the tongue contacts a stop side of the battery holder to lock the pairs of sliding joint structures. The present application also discloses an electric air-purifying respirator for an auto-darkening welding helmet, which is equipped with said lockable fitting structure.

In one aspect, a protective headwear is provided and includes a headgear, an outer shell, a duct and a manifold. The headgear is configured to engage a wearer's head and at least partially support the protective headwear on a wearer's head. The headgear includes a front, a rear opposite the front, a right side, and a left side opposite the right side. The outer shell is coupled to the headgear at a coupling location and includes a shield positioned to the front of the headgear. The duct is at least partially coupled to and at least partially positioned in an interior of the outer shell. The duct is located below the coupling location. The manifold is positioned to the rear of the headgear and configured to divert airflow into at least a first portion of airflow and a second portion of airflow

The present disclosure relates to a fog-reducing apparatus for eye protection equipment. For example, the fog-reducing apparatus includes a filter-pump system that provides air through one or more flexible hoses and across a lens of eye protection equipment. In certain implementations, the fog-reducing apparatus includes one or more nozzles (e.g., interchangeable nozzles) that provide directional air flow across the lens. Depending on the nozzle and/or an air flow controller, the fog-reducing apparatus can provide variable amounts of air flow and adjustable air flow direction as may be desired. In addition, the nozzle can attach to one or more components of the eye protection equipment, such as a lens, shield, or hood via one or more attachment mechanisms. Further, the nozzle can be inserted through an air vent or other hole into the eye protection equipment.

In one aspect, a protective headwear is provided and includes an outer shell, a first shell duct coupled to the outer shell and including a first exhaust port, and a second shell duct coupled to the outer shell and spaced apart from the first shell duct. The second shell duct includes a second exhaust port. The protective headwear also includes a manifold positioned externally of the outer shell and configured to divert airflow into at least a first portion of airflow and a second portion of airflow. The manifold includes a first diversion member coupled to and in fluid communication with the first shell duct to provide the first portion of airflow to the first shell duct, and a second diversion member coupled to and in fluid communication with the second shell duct to provide the second portion of airflow to the second shell duct.

Provided is a disclosure for a head protection device that includes an air providing unit configured to provide air to a user, an air conduit configured to transport the air from the air providing unit to the head protection device, a power connector configured to receive power via electrical wiring from a power source that is not attached to the head protection device.

A magnetic quick connect for a fluid delivery system includes a male coupling member and a female coupling member. The male coupling member defines a first outer fluid communication path and includes a first magnetic material. A first inner member is disposed within the first outer fluid communication path and defines a first inner communication path. The female coupling member defines a second outer fluid communication path and includes a second magnetic material. A second inner member is disposed within the second outer fluid communication path and defines a second inner communication path. The male and female coupling members are detachably held together by an attractive force between the first and second magnetic materials such that the first and second outer communication paths are held in fluid communication, and the first and second inner communication paths are held in fluid communication.

A magnetic quick connect for a fluid delivery system includes a male coupling member and a female coupling member. The male coupling member defines a first outer fluid communication path and includes a first magnetic material. A first inner member is disposed within the first outer fluid communication path and defines a first inner communication path. The female coupling member defines a second outer fluid communication path and includes a second magnetic material. A second inner member is disposed within the second outer fluid communication path and defines a second inner communication path. The male and female coupling members are detachably held together by an attractive force between the first and second magnetic materials such that the first and second outer communication paths are held in fluid communication, and the first and second inner communication paths are held in fluid communication.

A magnetic quick connect for a fluid delivery system includes a male coupling member and a female coupling member. The male coupling member defines a first outer fluid communication path and includes a first magnetic material. A first inner member is disposed within the first outer fluid communication path and defines a first inner communication path. The female coupling member defines a second outer fluid communication path and includes a second magnetic material. A second inner member is disposed within the second outer fluid communication path and defines a second inner communication path. The male and female coupling members are detachably held together by an attractive force between the first and second magnetic materials such that the first and second outer communication paths are held in fluid communication, and the first and second inner communication paths are held in fluid communication.

In one aspect, a protective headwear is provided and includes an outer shell, a first shell duct coupled to the outer shell and including a first exhaust port, and a second shell duct coupled to the outer shell and spaced apart from the first shell duct. The second shell duct includes a second exhaust port. The protective headwear also includes a manifold positioned externally of the outer shell and configured to divert airflow into at least a first potion of airflow and a second portion of airflow. The manifold includes a first diversion member coupled to and in fluid communication with the first shell duct to provide the first portion of airflow to the first shell duct, and a second diversion member coupled to and in fluid communication with the second shell duct to provide the second portion of airflow to the second shell duct.

A ventilation unit and controller device comprises a ventilation unit with a housing. The housing has an intake port permitting flow of gas into the housing and an exhaust port permitting flow of gas out of the housing. Within the housing, a motorized fan is positioned to direct gas into the housing via the intake port and out of the housing via the exhaust port. A controller capable of controlling the ventilation unit communicates with a sensor capable of detecting an environmental stimulus. A source of electric current provides power to the ventilation unit and controller device. The device further comprises a switch capable of interrupting the electric current that powers the device. The device is capable of being removably attached via fasteners to an arc flash hood, and the arc flash hood comprises a ventilation opening to permit gas discharged by the device to enter the arc flash hood.