SCREW FEEDER Russian patent published in 2017 - IPC B65G33/26 

FIELD: engine devices and pumps.

SUBSTANCE: screw feeder contains a body with a cover, which have through channels for ball passing, a screw, installed in the body and the cover, a drive, rotating the screw. The drive is designed reversible to remove the waste balls from nonworking chambers of actuators. The screw is designed as a variable cylinder. At least one helical groove of half round shape is made in the cylindrical part of the greater diameter. The groove has a diameter, which is equal to the diameter of moving balls. Bearing units are installed in the cylindrical parts of smaller diameter on both sides of the cylindrical part of a greater diameter. Relevant areas are made at the outer ends of the channels for passing balls in the body and cover to connect ball supply and discharge manifolds.

EFFECT: creation of a mechanism for supplying balls to provide their work.

2 dwg