| 摘要 |
Safety helmet of the type comprising a chin guard (4) rotatably pivoted to the shell (5) between a pulled down position, at the lower end of the front opening of the shell (5), and at least one raised position over said front opening, and at least one reversible locking device of the chin guard (4) in such at least one raised position, the reversible locking device comprising at least one follower (3), integrally rotatable with the chin guard, and at least one corresponding countering element (1), constrained with at least one degree of freedom to the shell (5), or vice versa, such countering element (1) being intended for its engagement with the aforesaid at least one follower (3) at least in proximity of said raised position of the chin guard (4), as well as means (2) for manually regulating the position and/or the motion of said at least one countering element (1). Such at least one countering element (1) is movable between at least one locking position, by contrast of rigid parts, of the aforesaid at least one follower (3), when the chin guard (4) is at or in proximity of its raised position, and at least one disengagement position of such follower (3) from the countering element (1), the means (2) for regulating the position and/or the motion of the aforesaid at least one countering element (1) allowing or preventing the same countering element (1) to stably maintain the aforesaid at least one locking position by contrast of rigid parts for said at least one follower (3).
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