Ball Transfer ???
ISB Ball Transfer (Ball Bearing) divided into two categories; Ball up and Ball down.
“Ball up” Ball Transfer (Ball Bearing) consists of a large ball that sits upon small balls encapsulated in a hemispherical cup. Small balls roll smoothly in clearance upper area of hemispherical cup enables large ball to roll smoothly upon small balls.
Example usage of ball transfers .As shown in below pictures, ball transfers (Ball Bearing) are used in rotating and changing the direction in conveyor lines. Also as a castor or guide in conveyor lines and so many other applications.