Earth working tool with screw down device - has hole in cross bracket to guide bush and tube attached to end of tool shank

摘要

The tool consists of a framework in a carrier with a screw down device fitting into a tube (3) of diameter about 35mm and length about 80mm. The cylindrical tube is contained in a round carrier member (2) restory in a rigid cross bracket. The centre of the cross bracket has an aperture to connect the tool end with the shank (9) of the earth boring tool. The screw down device and tool members are maintained in correct alignment by the guidance of the external frame which has two parallel similar members.