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 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.

A helmet includes a shell having an interior surface, a padding disposed along the interior surface of the shell, and a chinbar. The padding defines a first engagement surface positioned at a first lateral side of the padding and a second engagement surface positioned at an opposing second lateral side of the padding. The chinbar includes a cage, a first flange, and a second flange. The cage includes a first end defining a third engagement surface and a second end defining a fourth engagement surface. The third engagement surface interfaces with the first engagement surface and the fourth engagement surface interfaces with the second engagement surface. The first flange extends from the first end of the cage. The second flange extends from the second end of the cage. The first flange and the second flange of the chinbar are embedded within the padding.

A helmet includes a shell having an interior surface, a padding disposed along the interior surface of the shell, and a chinbar. The padding defines a first engagement surface positioned at a first lateral side of the padding and a second engagement surface positioned at an opposing second lateral side of the padding. The chinbar includes a cage, a first flange, and a second flange. The cage includes a first end defining a third engagement surface and a second end defining a fourth engagement surface. The third engagement surface interfaces with the first engagement surface and the fourth engagement surface interfaces with the second engagement surface. The first flange extends from the first end of the cage. The second flange extends from the second end of the cage. The first flange and the second flange of the chinbar are embedded within the padding.

A helmet is disclosed including: a helmet body; a jaw guard with two fork handles through which the jaw guard is mounted on the helmet body and rotatable around a fixed axis relative to the helmet body; a shield assembly including a shield and a bracket, which is movable between a lowered position and a raised position relative to the helmet body; and a lifting mechanism including a trigger located beside the bracket of the shield assembly and driven by the fork handles of the jaw guard, and the trigger can touch the bracket of the shield assembly at the lowered position and raise the shield assembly from the lowered position. The lifting mechanism further includes an elastic element with one end connected with the bracket, which is arranged to make the shield assembly continue to move to the raised position after the shield assembly leaves the lowered position.

A helmet breath guard add-on which is capable of effectively preventing steam formation in a helmet shield, thereby removing inconveniences when wearing a helmet, is disclosed. The breath guard may be made from a flexible yet solid elastomeric material providing for an adequate elastic adjustment, and allowing a fit to a wide variety of different helmet user faces. Preferably, the single piece nature of the breath guard allows for the prevention of leaks for adequate helmet fog reduction. The elastic nature of the material allows the breath guard to generally keep its shape even when distorted from the putting on and the removal of the helmet.

A helmet attachment system is usable to attach a mandible or face or mouth guard. The helmet attachment system also comprises a pair of attachment bases, each arranged on a side of the helmet near to an ear covering of the helmet. The attachment bases each include a metal base plate covered by an attached body block. Each attachment base provides provisions for attaching opposite ends of a mandible to the bases. The metal base plate includes hooks for engaging an edge of the helmet. A pair of strap assemblies is provided, each strap assembly connected to one attachment base. The strap assemblies extend rearward and are connected to the back rail by a buckle member on the end of each strap assembly. The back rail includes a pair of buckle member-receiving slots. The straps assemblies and the hooks provided on the attachment bases secure the attachment bases to the helmet.

A protective helmet including a helmet body, a facemask extending from the front portion to cover at least a portion of a face of a wearer, and one or more adjustment mechanisms securing the facemask to the helmet body. The adjustment mechanism(s) is/are connected to the helmet, include(s) an engagement member engaged with the facemask, is/are selectively engageable with the facemask in at least two vertically spaced apart positions of the facemask relative to the helmet body, and allow(s) toolless adjustment between the vertically spaced apart positions. Adjustment mechanisms and methods of positioning a facemask are also discussed.

Methods and devices for adjusting the position of a mandible guard relative to a helmet are disclosed. Adjustment of the mandible guard may be performed by a user while the user is wearing the helmet and/or without the use of tools. A mandible guard adjustment system may be combined with an attachment system for attaching and removing the mandible guard to a helmet.

A helmet for use by a driver of a vehicle or vessel includes a chin guard extending from side to side over the front open part of a helmet shell molded to an open-face shape, and supported about an axis passing through the right to left side of the helmet shell so as to swivel up and down, the chin guard including a surface layer member formed from a flexible material so as to be deformable by deflection into a shape conforming to different widths of different helmet shells, and a core member formed from a rigid material and mounted inside of the surface layer member to inhibit the surface layer member from deflection.