SAFETY DEVICE FOR NEUTRALIZING THE CLUTCH OF A SNOWMOBILE

Device for neutralizing, when starting up, the driving effect of a pulley having truncated cheeks of which a first one is secured on a rotary axle whereas a second one is slidably mounted thereon, the cheeks being biassed by a spring tending to move the second cheek from the first one, this movement being however subjected to the counter-effect of a governor mounted on the axle to rotate therewith and of which the centrifugal masses act on the second cheek to bring it back toward the first one as soon as the axle is brought into rotation beyond a predetermined speed. This device comprises a locking mechanism mounted on the axle to cooperate with the second cheek in such a manner as to prevent it, as soon as the axle starts rotating, from moving toward the first cheek under the action of the centrifugal masses. It also comprises a manually operable mechanism related to the said locking mechanism in such a way as to release, when operated, the second cheek so that it may suddenly be projected toward the first cheek when the axle is placed in rotation at a speed greater than the said predetermined speed. This locking mechanism comprises a collar solid with the second cheek and two levers pivotally mounted at one end on the axle so that their other end may move away from the axle under the effect of the centrifugal force. The collar and the levers are made so that the said other end of the levers may come in abutment against the collar when the axle starts rotating and thus hold it; the manually operable mechanism comprises means capable of holding the levers in abutment position, this means being displaceable at will to release the levers once the axle has reached the aforesaid predetermined speed.