Milling tool in order to the embodiment of the recesses in the elements of the construction in the masonry work, or other materials which are fragile concrete

摘要

The milling tool is used to make under-reamed openings in building components of masonry or other brittle material. It comprises a driven shaft together with an arrised annular cutting head, the latter being mounted free to rotate on a trunnion which is offset from the shaft. The transverse internal section of the milling head's body may exceed the transverse section of the trunnion, the envelope of the latter oversailing the former at one or more locations, and the former comprising an oval, a circular, or a polygonal opening.