Scorpion, Inc.

John P Lundberg

Carl W Schellin

A V belt pulley clutch assembly for a variable speed transmission which may be either the driving or the driven pulley, and which has one movable sheave which is both speed and torque responsive, and wherein the torque responsive portions comprise raised spiral ramps on the hub of the movable portion of the V belt pulley driven through saddle type members riding on the spiral ribs. The ribs are spiraled axially along the hub of the movable portion of the V belt pulley in a direction so that when the driven member is subjected to more load the unit tends to shift into a lower drive ratio. That is when the drive clutch assembly is powered from a drive shaft, the spirals are arranged so that the pulley halves tend to separate under increasing load on the belt. The ribs are on the external surface of a hub and can be die cast draft free for permitting driving and sliding between two relatively movable pulley halves.

Expansible pulley with torque and centrifugal response

A safety switch system for use on snowmobiles that eliminates the hazards of previous systems by providing series connected normally closed switches, one connected directly into the throttle control lever which the operator must press for increasing engine speed from idle, and the other mounted directly on the carburetor and controlled by the throttle control arm which is directly connected to the butterfly valve of the carburetor. The two switches are connected to an engine kill system, such as a ground circuit for the ignition. One of the switches must be open for the engine to be running. This means that when the throttle is open (the carburetor control arm is away from idle position) and the operator's hand is off the throttle control lever the engine is dead. However, with the throttle arm in idle position the engine will run whether the operator has his hand on the manual throttle control lever or not. If the operator has his hand pressing with force on the manual throttle control lever the engine will run whether the carburetor throttle arm is open or closed. The positioning of the control switches eliminates the hazards that can result from mechanical failure of components because of the direct placement of the switches at the critical control locations.

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Pequot Lakes, MN, United States of America

John P Lundberg