Intrapersonal communication systems and methods that provide an optical digital signal link between two or more local devices are disclosed. In some embodiments, the system includes a first signal converter disposed at a first end of the optical digital signal link and configured to convert between electrical digital signals from a first local device and optical digital signals from the optical digital signal link. The system can include an optical connector having a non-contact portion configured to couple optical digital signals between the first signal converter and the optical digital signal link across a gap. The system can include a second signal converter disposed at a second end of the optical digital signal link and configured to convert between electrical digital signals from the second local device and optical digital signals from the optical digital signal link.

A method for training an athlete to adopt a vertical head-up position includes: placing a visor comprising an opaque region over the face of the athlete such that the opaque region of the visor blocks the upper peripheral vision of the athlete if the athlete lowers his/her head below the vertical head-up position; and having the athlete train with the visor over his/her face to teach the athlete to keep the head in the vertical head-up position, thereby minimizing a risk of head-to-head contact with another athlete during a game. An apparatus for training an athlete to adopt a vertical head-up position is also described.

A helmet detects shear force impacts. Indicator elements in the helmet or protective gear provides a visual indication, an audio indication, or a combination is contained in the surface of the outer shell of the helmet and detects when there is a mechanical force imparted on the helmet. One or more sensors are embedded in the helmet and detect when a shear force is imparted on the helmet. In other embodiments, the sensors can detect that there was a mechanical force on the helmet and also measure the energy of the force. The outer surface of the helmet may have a lining that changes appearance with a shear impact force hits the surface of the helmet.

A helmet detects shear force impacts. Indicator elements in the helmet or protective gear provides a visual indication, an audio indication, or a combination is contained in the surface of the outer shell of the helmet and detects when there is a mechanical force imparted on the helmet. One or more sensors are embedded in the helmet and detect when a shear force is imparted on the helmet. In other embodiments, the sensors can detect that there was a mechanical force on the helmet and also measure the energy of the force. The outer surface of the helmet may have a lining that changes appearance with a shear impact force hits the surface of the helmet.

An interface system for a helmet mounting system comprises a helmet strap assembly. A helmet shroud includes a shroud interface assembly configured to mate with a first hot shoe of a helmet mount assembly. The shroud interface assembly comprises a high speed data interface configured to be electrically coupled to the first hot shoe when the shroud interface assembly is coupled with the first hot shoe. A battery mount assembly comprises a second hot shoe portion which is configured to mate with a hot shoe receiver of a battery pack. The second hot shoe portion comprises a high speed data interface which is configured to be electrically coupled to high speed contacts on the hot shoe receiver of the battery pack when the second hot shoe portion is coupled with the hot shoe receiver of a battery pack.

A neck cover and a helmet are provided that improve quietness of a helmet interior and that do not cause inconvenience for a wearer. In order to eliminate a gap between an opening portion of a helmet and a neck periphery of a wearer, insert-through holes, which are for passage of a chin strap that is attached to an inner side of the helmet, are formed in a portion, which covers a front portion (throat) of a neck, of a neck cover that is attached to a peripheral edge of the opening portion.

A protective helmet includes an outer shell. A bladder, coupled to the outer shell, provides shock absorption in at least one zone or protection. The bladder holds an absorption pack that contains a plurality of absorption particles and/or a fluid and has a relief valve for relieving pressure on the bladder when the pressure on the bladder is greater than a pressure threshold.

A light-emitting system is provided which is removably attachable to headgear for personal illumination to enhance visibility of the user to others. The light-emitting system includes a housing that defines a receiving aperture and is configured to surround a portion of the headgear when the light-emitting system is removably attached to the headgear for use. The light-emitting system further includes at least one lens and a plurality of lighting elements coupled to the annular housing which are configured to selectively generate a halo or at least a partial halo of light that radiates outwardly away from the annular housing through the at least one lens to provide enhanced personal illumination.

The present application relates to helmet pads (120) comprising a ballistic protection layer (126). It also relates to a ballistic helmet (100) that comprises a helmet pad comprising a ballistic protection layer. Further, the present application also relates to a helmet pad replacement set wherein one or more of the replacement helmet pads comprises a ballistic protection layer.

(in connection with FIG. 1)

The invention relates to a ballistic protective helmet (10) comprising a shell (21) comprising a shell material that is produced from a number of textile layers (11, 12) connected in a connection matrix.

The shell (21) of the protective helmet (10) according to the invention has a blind hole (22), wherein a threaded sleeve (23) has an outer thread (25) that penetrates into the shell material which surrounds the blind hole (22) in a peripheral direction, and wherein the threaded sleeve (23) has an inner thread (26) for connecting to a screwing means (24) having an outer thread (31).