Regulator for pneumatic vibrator

Claim 1

In a pneumatic vibrator of the type having a vibrationgenerating body arranged to roll within a casing about an axis, and passage means in the casing for communicating a gas under above-atmospheric pressure to produce rolling of the vibrationgenerating body, the improvement of a regulator comprising adjustable valve means interposed in the passage means and including a valve member shiftable between a first position for communication of the gas under pressure in an amount not less than that required for a predetermined vibration of the vibrator under a given load and a second position restricting gas flow through the passage means to an amount limiting vibration to said predetermined vibration of the vibrator under loads less than said given load, means defining a tapered raceway having an axis generally coincident with the axis about which the vibrationgenerating body rolls, said tapered raceway including a surface on a member that is movable to shift the valve member in a direction from said first position toward said second position thereof, means normally urging said valve in a direction from said second position toward said first position thereof, and a regulating body received in the raceway for rolling therein about the axis of the raceway, the regulating body having a mass such that upon acceleration thereof due to vibration of the vibrator in excess of said predetermined vibration the regulating body moves outwardly in the raceway and in so moving moves the movable member in a direction to shift the valve member from said first position toward said second position.