Speed discrimination clutch

A centrifugal clutch for transmitting rotary motion from a first rotating shaft to a second rotatable member, only when the first rotating shaft has an angular speed of a value between predetermined upper and lower angular speeds, including a first circular plate fixed to the rotating shaft. A pair of spring biased members having shoulders formed on the outer edges thereof are pivoted to the circular plate and are adapted to move outwardly during rotation at a sufficient angular speed. The first circular plate is received by four arcuate shoes radially slidably mounted on a second circular plate and include inwardly extending projections formed thereon adapted to engage the shoulders. After rotational speed increases beyond a predetermined upper limit, the shoes move outwardly relative to the plate and disengage the clutch.