Helmet with gear-constraint transformable chin guard structure

A helmet with a gear-constraint transformable chin guard structure, comprising:

• a shell body;
• a chin guard;
• and
• two supporting bases,
• wherein the two supporting bases are arranged on two sides of the shell body, respectively, and the two supporting bases are fastened on the shell body or integrated with the shell body;
• wherein the chin guard is provided with two branches which are arranged on two sides of the shell body, respectively;
• wherein for each of the two supporting bases, an inner gear constrained by the supporting base and/or the shell body and an outer gear constrained by the supporting base and/or the shell body are provided;
• wherein the inner gear is rotatable about an axis of the inner gear, and the outer gear is rotatable about an axis of the outer gear;
• wherein the inner gear comprises a body or an attachment having a through slot, and a drive member running through the through slot is provided;
• wherein the supporting base, the branch, the inner gear, the outer gear and the drive member on a side of the shell body constitute an associated mechanism;
• wherein in the associated mechanism, the branch is arranged outside the through slot of the inner gear, the outer gear and the inner gear are meshed with each other to constitute a kinematic pair, and the inner gear is in sliding fit with the branch to constitute a slidable kinematic pair;
• wherein the drive member is connected to the outer gear at one end of the drive member, such that the drive member is able to be driven by the outer gear or the outer gear is able to be driven by the drive member;
• the drive member is connected to the branch at the other end of the drive member, such that the branch is able to be driven by the drive member or the drive member is able to be driven by the branch;
• wherein in the associated mechanism, the kinematic pair constituted by the inner gear and the outer gear is a planar gear drive mechanism;
• and
• wherein in the associated mechanism, the inner gear and the outer gear are cylindrical gears;
• and, when the inner gear and the outer gear are meshed with each other, a pitch radius R of the inner gear and a pitch radius r of the outer gear satisfy a relationship:
• R/r=2.

A helmet with a gear-constraint transformable chin guard structure, comprising:

• a shell body;
• a chin guard;
• and
• two supporting bases,
• wherein the two supporting bases are arranged on two sides of the shell body, respectively, and the two supporting bases are fastened on the shell body or integrated with the shell body;
• wherein the chin guard is provided with two branches which are arranged on two sides of the shell body, respectively;
• wherein for each of the two supporting bases, an inner gear constrained by the supporting base and/or the shell body and an outer gear constrained by the supporting base and/or the shell body are provided;
• wherein the inner gear is rotatable about an axis of the inner gear, and the outer gear is rotatable about an axis of the outer gear;
• wherein the inner gear comprises a body or an attachment having a through slot, and a drive member running through the through slot is provided;
• wherein the supporting base, the branch, the inner gear, the outer gear and the drive member on a side of the shell body constitute an associated mechanism;
• wherein in the associated mechanism, the branch is arranged outside the through slot of the inner gear, the outer gear and the inner gear are meshed with each other to constitute a kinematic pair, and the inner gear is in sliding fit with the branch to constitute a slidable kinematic pair;
• wherein the drive member is connected to the outer gear at one end of the drive member, such that the drive member is able to be driven by the outer gear or the outer gear is able to be driven by the drive member;
• the drive member is connected to the branch at the other end of the drive member, such that the branch is able to be driven by the drive member or the drive member is able to be driven by the branch;
• and
• further comprising a visor, wherein the visor comprises two legs arranged on two sides of the shell body, respectively, and capable of swinging around a fixed axis relative to the shell body;
• a load-bearing rail side is arranged on at least one of the legs, and the leg with the load-bearing rail side is arranged between the supporting base and the shell body;
• a through opening is constituted in an inner supporting plate on the supporting base facing the shell body, and a trigger pin extending out of the opening and capable of coming into contact with the load-bearing rail side of the leg is arranged on the outer gear;
• and, when the visor is in a fully buckled state, the arrangement of the trigger pin and the load-bearing rail side satisfies several conditions:
• when the chin guard is opened from the full-helmet structure position, the trigger pin is able to come into contact with the load-bearing rail side on the leg and thereby drive the visor to turn over;
• and when the chin guard returns to the full-helmet structure position from the semi-helmet structure position, during the first two-thirds of the return trip of the chin guard, the trigger pin is able to come into contact with the load-bearing rail side on the leg and thereby drive the visor to turn over.