Patent ID: 8136537

Claim:
An actuation device comprising a driven member, a driving member, and actuating means operable for producing a movement of the driving member, wherein a first of said members has a first seat into which an engagement part belonging or associated to a second of said members is at least partially inserted, and wherein the second of said members has a second seat which, in at least one condition of the actuation device, at least partially faces the first seat, the actuation device further comprising at least one floating body, capable of displacement between the two seats when they are at least in part facing each other, following successive actuations of the actuating means and/or movements imparted to the device, and constraint means configured for preventing accidental or irregular displacements of the floating body, particularly accidental or irregular movements due to knocks, vibrations and similar mechanical stresses, wherein said constraint means comprises; first constraint means belonging to the first of said members, the first constraint means being operatively inserted, with possibility of relative movement, into the second seat and comprising two projections of the first of said members, the two projections identifying between them a constraint region for the floating body in at least one condition of the device.