ADJUSTABLE GRINDING TOOL FOR BRAKE CYLINDERS AND THE LIKE

摘要

A grinding tool has a hollow hub at one end to which is pivotally mounted three arms each of which carries a pivotable shoe having mounted thereon a grinding stone. The arms may be radially contracted and held by an axially movable sleeve on the hub which has a radial annular flange serving as an abutment to limit axial advance of the tool in a cylinder being ground. A spring catch member on each of the shoes engages a camming edge of a hole in the arm to disengage the shoes. An adjustment means for setting the maximum radial expansion of the arm includes a spring loaded plug in the hub bearing on notches in the ends of the arm.