Helmet

Patent metadata

Field	Value
Publication number	US-11330858-B2
Application number	US-201816615857-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	May 22, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

Plural contact pieces of a shaft member, which is mounted to a helmet main body, abut a cam surface that is formed at a hole portion provided in a proximal end portion of a chin guard. When the chin guard is rotated from a fully closed position to a fully open position with respect to the helmet main body, at least one of the contact pieces abuts an anchor surface, and, simultaneously, at least another one contact piece fits into a concave portion, and, due thereto, the chin guard is fixed with respect to the helmet main body.

First claim

The invention claimed is:

1. A helmet comprising:
supporting shafts fixed to outer side surfaces of a helmet main body, the supporting shafts having outer peripheral surfaces at which a plurality of contact pieces are formed; and
a chin guard having proximal end portions forming supporting holes into which the supporting shafts are inserted, the chin guard being mounted to rotate around the supporting shafts that are inserted into the supporting holes, between a fully closed position at which the chin guard protects a jaw of a helmet wearer and a fully open position at which the chin guard expands a field of view of the helmet wearer, and at which cam surfaces, having positions of contact with the contact pieces that change accompanying rotation, are formed at inner peripheral surfaces of the supporting holes,
wherein each cam surface has
an anchor surface that, in a case in which the chin guard is rotated to a position immediately before the fully open position, by being abutted by at least one of the contact pieces accompanying rotation, imparts resistance in a direction opposite to a rotating direction of the chin guard, and
a concave portion into which, in a case in which the chin guard is rotated past the immediately before the fully open position to the fully open position, at least one of the contact pieces is fit and that fixes the chin guard at the fully open position, and

wherein, when the chin guard rotates to the fully open position, the chin guard is fixed due to at least a first one of the contact pieces abutting the anchor surface of the cam surface, at least a second one of the contact pieces being fit in the concave portion.

2. The helmet of claim 1 , wherein each cam surface further has a decentering surface that, in a case in which the chin guard is rotated from the fully closed position to the fully open position, by being abutted by at least one of the contact pieces accompanying rotation, pushes the chin guard out in a forward direction.

3. The helmet of claim 2 , wherein each supporting shaft has a supporting plate that is mounted to an outer side surface of the helmet main body, and a shaft member that is mounted to the supporting plate with a proximal end portion of the chin guard between the shaft member and the supporting plate, and has an outer peripheral surface forming the contact pieces that abut the cam surface that is formed at the supporting hole of the proximal end portion.

4. The helmet of claim 1 , wherein each supporting shaft has a supporting plate that is mounted to an outer side surface of the helmet main body, and a shaft member that is mounted to the supporting plate with a proximal end portion of the chin guard between the shaft member and the supporting plate, and has an outer peripheral surface forming the contact pieces that abut the cam surface that is formed at the supporting hole of the proximal end portion.

5. The helmet of claim 4 , wherein a projecting portion that projects out toward a supporting plate side is formed at each proximal end portion, and a temporarily anchoring concave portion, on which the projecting portion is anchored when the chin guard arrives at the position immediately before the fully open position, is formed at a surface that is at a proximal end portion side of the supporting plate.

6. The helmet of claim 5 , wherein a projecting portion that projects out toward a supporting plate side is formed at each proximal end portion, and an actually anchoring concave portion, with which the projecting portion is fit together when the chin guard arrives at the fully open position, is formed at a surface that is at a proximal end portion side of the supporting plate.

7. The helmet of claim 4 , wherein a projecting portion that projects out toward a supporting plate side is formed at each proximal end portion, and an actually anchoring concave portion, with which the projecting portion is fit together when the chin guard arrives at the fully open position, is formed at a surface that is at a proximal end portion side of the supporting plate.

8. A helmet comprising:
a shaft mechanism having a supporting plate and a supporting shaft, the shaft mechanism being fixed to an outer side surface of a helmet main body, the supporting shaft having a plurality of contact pieces formed on an outer peripheral surface; and
a chin guard having a proximal end connected to the supporting shaft such that the chin guard rotates about the supporting shafts at a closed position, a temporarily open position, and a fully open position, the chin guard having a cam surface forming a closed loop surrounding the contact pieces, wherein the chin guard is configured to:
rotate about a rotation axis between the closed position and the temporarily open position, and
rotate about a first contact piece of the plurality of contact pieces between the temporarily open position and the fully open position, the rotation axis does not overlap with the first contact piece.

9. The helmet of claim 8 , wherein the cam surface includes:
an anchor surface configured to engage with the first contact piece when the chin guard is at the temporarily open position and at the fully open position, and
a concave surface configured to engage with a second contact piece of the plurality of contact pieces when the chin guard is at the fully open position.

10. The helmet of claim 9 , wherein the cam surface further includes:
an inclined surface configured to engage with the first contact piece when the chin guard is at the closed position.

11. The helmet of claim 9 , wherein the chin guard further includes a boss,
wherein the supporting plate is located between the proximal end of the chin guard and the helmet main body, the supporting plate having a plurality of projecting portions projecting toward the proximal end of the chin guard and forming a first anchoring concave portion and a second anchoring concave portion therebetween, wherein
the first anchoring concave portion is configured to accommodate the boss when the chin guard is at the temporarily open position, and
the second anchoring concave portion is configured to accommodate the boss when the chin guard is at the fully open position.

Assignees

• Shoei Co Ltd

Inventors

• Nimura Taku

Classifications

• A42B3/326 Primary

  Helmets with movable or separable chin or jaw guard · CPC title

• A42B3/205 Primary

  Chin protectors · CPC title

• A42B3/223

  with means for locking the visor in a fully open, intermediate or closed position · CPC title