A mounting rail assembly comprises a rail configured to be coupled to a helmet. The rail may include a rear surface and a front surface with a mounting groove extending along a length of the front surface. The mounting groove may be open outwardly from a front surface of the rail and be configured to couple to a first accessory device at two or more positions along the length of the rail. A recess may be proximate an edge of the mounting rail assembly. The recess may be open generally perpendicular to the mounting groove and configured to receive a second accessory device. At least a portion of the recess may be positioned between the mounting groove and the rear surface of the rail.

A mounting rail assembly comprises a rail configured to be coupled to a helmet. The rail may include a rear surface and a front surface with a mounting groove extending along a length of the front surface. The mounting groove may be open outwardly from a front surface of the rail and be configured to couple to a first accessory device at two or more positions along the length of the rail. A recess may be proximate an edge of the mounting rail assembly. The recess may be open generally perpendicular to the mounting groove and configured to receive a second accessory device. At least a portion of the recess may be positioned between the mounting groove and the rear surface of the rail.

Systems and methods are provided for determining an acceleration at a location of interest within one of a user's head and neck. At least one of linear acceleration data, angular acceleration data, angular velocity data, and orientation data is produced using at least one sensing device substantially rigidly attached to an ambient-accessible surface of the user's head. The location of interest is represented relative to a position of the at least one sensing device as a time-varying function. An acceleration at the location of interest is calculated as a function of the data produced at the sensing device and the time-varying function representing the location of interest. The calculated acceleration at the location of interest is provided to at least one of the user and an observer in a human-perceptible form.

A wireform attachment mechanism, or support arm, that can be used to attach an earcup to a helmet. The outer end of the support arm can be opened to release the earcup, or closed to clamp onto the earcup.

A wireform attachment mechanism, or support arm, that can be used to attach an earcup to a helmet. The outer end of the support arm can be opened to release the earcup, or closed to clamp onto the earcup.

The present invention discloses a safety devices adapted to prevent workers from going into hazardous environment, such as underground using the faulty safety device. As a safety device, typically embodied as a cap lamp, must be charged prior to each use, the device is adapted to detect when the device is removed from the charger. The device starts to blink continuously when disconnected from the charger. An automated test procedure is completed on the device. The user may also complete a manual portion of the test procedure to make the device usable. When the test procedure is completed successfully, the lamp stops blinking. If the test procedure is not successful, the lamp continues blinking to effectively prevent user from using a faulty device.

A lighting system for a helmet, and in particular an aircrew member's helmet, which lighting system includes reconfigurable strips of light emitting diode (LED) lights.

Provided is a head protection device with multiple face shields, where the head protection device is configured to be able to provide a flow of air to a user of the head protection device. The air flow may be provided by an external air providing device.

A head and neck restraining system is disclosed herein. The system includes a helmet, a neck brace structure, and a tether system. The neck brace structure includes a neck extension that is attached to shoulder extensions. The tether system includes a single tether with double thickness terminal ends. The double thickness terminal ends have a plurality of pass-through openings that are adapted to receive a removable securing pin that threadedly secures the tether to the neck brace. The tether also secures the helmet to the neck brace and limits its range of motion during an accident. The tether is removable secured to the neck brace on one side then extends from the neck brace to the helmet, then continues from the helmet to the back of the neck brace, then continues further from the back of the neck brace to the opposite side of the helmet, and then is removable secured to the other side of the neck brace. The tether may be slideablely or fixedly attached to the helmet and neck brace.

The present disclosure includes a retrofit sensor module for use with a protective head top with a helmet and a visor. The sensor module includes a sensor housing and an attachment mechanism. The sensor housing encloses a head presence sensor to sense when the protective head top is being worn. The sensor housing also encloses a position sensor to sense the position of the visor relative to the helmet. The retrofit sensor module further comprises an attachment mechanism secured to the housing. The attachment mechanism mates with a first hinge component of a hinge assembly in the protective head top to removably install the sensor module into the protective head top, wherein the hinge assembly allows the visor to move relative to the helmet.