Abstract: A protective helmet has an outer shell, a protection shield movable relative to the outer shell between a deployed position and a stowed position, and a linkage mechanism for connecting the protection shield to the outer shell and permitting movement of the protection shield between the deployed and stowed positions. The linkage mechanism has a first link with a first end connected to the outer shell and a second end connected to the protection shield, a second link having a first end connected to the outer shell and a second end connected to the protection shield, and a biasing member having a first end connected to the first link and a second end connected to the second link. The second end of the biasing member moves between the first and second ends of the second link during movement of the protection shield between the deployed and stowed positions.

Abstract: A protective helmet has an outer shell configured for surrounding a head of a user and at least one accessory attachment rail connected to the outer shell. The accessory attachment rail has a body having a front end, a rear end, and one or more slots between the front end and the rear end. Each of the one or more slots is configured for removably receiving at least one helmet accessory. A locking mechanism is associated with each of the one or more slots for automatically locking the at least one helmet accessory in the one or more slots upon insertion of the at least one helmet accessory within the one or more slots and for preventing removal of the at least one helmet accessory from the one or more slots. At least one connection element is provided for connecting the accessory attachment rail to the outer shell.

Abstract: A protective helmet has an outer shell, a protection shield movable relative to the outer shell between a deployed position and a stowed position, and a linkage mechanism for connecting the protection shield to the outer shell and permitting movement of the protection shield between the deployed and stowed positions. The linkage mechanism has a first link with a first end connected to the outer shell and a second end connected to the protection shield, a second link having a first end connected to the outer shell and a second end connected to the protection shield, and a biasing member having a first end connected to the first link and a second end connected to the second link. The second end of the biasing member moves between the first and second ends of the second link during movement of the protection shield between the deployed and stowed positions.

Abstract: A protective helmet has an outer shell configured for surrounding a head of a user and at least one accessory attachment rail connected to the outer shell. The accessory attachment rail has a body having a front end, a rear end, and one or more slots between the front end and the rear end. Each of the one or more slots is configured for removably receiving at least one helmet accessory. A locking mechanism is associated with each of the one or more slots for automatically locking the at least one helmet accessory in the one or more slots upon insertion of the at least one helmet accessory within the one or more slots and for preventing removal of the at least one helmet accessory from the one or more slots. At least one connection element is provided for connecting the accessory attachment rail to the outer shell.