Electrically powered device for opening and closing the visor of a crash helmet

Claim 1

An electrically powered device for opening and closing the visor of a crash helmet comprising: a casing positioned within the temple regions of the motorcyclist's crash helmet; an electric motor including a reduction gearing and housed in said casing; a gear segment movably supported on said casing and driven by said motor through said reduction gearing; a slot formed in the walls of said casing; a first pin mounted for rotation together with and projecting from said gear segment slidably engaging in said slot and connecting the visor ends to said gear segment; a cam comprising a first rectilinear portion followed by a second portion in the shape of an arc of a circle, a second pin projecting from said gear segment and engaging in said cam; the first portion of said cam having limits, which define a stroke of said second pin, which is equal to the stroke allowed to said first pin by said slot, so that when a rotatory motion is imparted by the motor to the reduction gearing, this rotatory motion is converted first in a linear motion of the gear segment and thereafter the rotatory motion is transmitted to the gear segment, when said gear segment reaches a rotatory condition.