A modular helmet system with a removable/detachable/interchangeable exterior shell, an inner force-absorbing layer releasably connected to the rigid exterior shell layer, and a multiple fastening devices associated with the shell which allow the shell to be interchanged/replaced/reconfigured at will. The shell as a single piece unit, or combinable components bear the fastening devices designed to enable rapid, secure interchange of the helmet system's layers, therefore allowing the helmet to be adapted for climatic, functional, and aesthetic preferences.

A modular helmet system with a removable/detachable/interchangeable exterior shell, an inner force-absorbing layer releasably connected to the rigid exterior shell layer, and a multiple fastening devices associated with the shell which allow the shell to be interchanged/replaced/reconfigured at will. The shell as a single piece unit, or combinable components bear the fastening devices designed to enable rapid, secure interchange of the helmet system's layers, therefore allowing the helmet to be adapted for climatic, functional, and aesthetic preferences.

A collapsible helmet may include a number of chassis segments that are mechanically coupled to one another, where at least some of the chassis segments are collapsible into another chassis segment for storage, and where the chassis segments are expandable so that the helmet is suitable for wearing on a user's head for protection thereof. For example, certain aspects include a three-piece collapsible helmet that has interlocking fingers. In this manner, when the helmet is closed, the interlocking fingers allow the helmet to conveniently fold or collapse into a compact form. Moreover, when the helmet is opened, the interlocking fingers may provide a desired head coverage for protection of a wearer.

An adjustable helmet includes a main shell having a first side portion, and a second side portion. The first side portion and the second side portion are laterally flexible with respect to one another. The adjustable helmet includes a secondary shell coupled to the main shell at a location between the first side portion and the second side portion. At least a portion of the first side portion and at least a portion of the second side portion each extends over at least a portion of a top surface of the secondary shell. The adjustable helmet includes a tensioning device. A first end of the tensioning device is coupled to the first side portion and a second end of the tensioning device is coupled to the second side portion so as to provide a tension force between the first side portion and the second side portion.

A helmet with a gear-constraint type transformable chin guard structure may include a shell body, a chin guard and two branches on the chin guard, wherein a supporting base, the branch, an inner gear, an outer gear and a drive member form an associated mechanism, the inner gear and the outer gear are rotatable about fixed axes and constitute a meshing constraint pair, the inner gear and the branch are in sliding fit with each other and constitute a sliding constraint pair, and the drive member transfer the motion of the outer gear to the branch and causes the chin guard to make an extension/retraction displacement relative to the shell body, such that the chin guard makes an turnover motion while also recombining a reciprocating motion, thereby realizing a transformation between a full-helmet position and a semi-helmet position.

A helmet attachment may include a body, a connector, and a fastener. The body may have a rim and a concave inner surface configured to engage convex outer surface of a helmet. The connector may be coupled to the inner surface of the body and the connector may be configured to engage a helmet connector. The fastener may extend from the rim and be configured to engage an element coupled to the helmet.

A protective sports helmet that includes a chin strap system that allows for rapid, one-handed adjustment of a chin strap assembly by the player while he/she is wearing the helmet is provided. The chin strap assembly includes a protective chin cup and a pair of straps extending from opposed sides of the chin cup and having a plurality of securing elements. The assembly also includes a pair of adjustable connectors affixed to the helmet and that include a central opening that receives an extent of the strap and a lever that engages a portion of the securing elements. The adjustable connector allows movement of the strap in a first direction, and prevents movement of the strap in a second direction when the lever is engaged with at least one of the securing elements. The adjustable connector allows movement of the strap in both the first and second directions when the lever is not engaged with the securing elements.

The present invention relates to a protective helmet (10) comprising an outer shell (12) and a visor (14) removably coupled to the outer shell (12) by means of a fastening mechanism (20) positioned on facing surfaces of the shell (12) and the visor (14). According to the invention the fastening mechanism (20) comprises complementarily shaped elements (22, 24) comprising at least one protrusion (22) and at least one receiving seat (24) provided with a flexible holding portion (26). The at least one protrusion (22) is adapted to be removably fixed inside the at least one receiving seat (24) by engaging the flexible holding portion (26).

The present invention relates to a protective helmet (10) comprising an outer shell (12) and a visor (14) removably coupled to the outer shell (12) by means of a fastening mechanism (20) positioned on facing surfaces of the shell (12) and the visor (14). According to the invention the fastening mechanism (20) comprises complementarily shaped elements (22, 24) comprising at least one protrusion (22) and at least one receiving seat (24) provided with a flexible holding portion (26). The at least one protrusion (22) is adapted to be removably fixed inside the at least one receiving seat (24) by engaging the flexible holding portion (26).

A front cover for a helmet connectable to a shell for the helmet for covering an upper side, a rear side, and two sides of the head of a wearer so as to protect the upper side, the rear side, and two sides of the head of the wearer, is provided. The front cover includes a jaw protection portion configured to protect the wearer's jaw when the front cover is connected to the shell, and a jaw mediation portion connected to the jaw protection portion and configured to serve to mediate the jaw protection portion and the shell by being connected to the shell. When the jaw protection portion is connected to the shell by the jaw mediation portion, the jaw protection portion is rotatable based on the shell.