Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1991-08-05
1994-02-15
Briggs, William
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
166 552, 175412, 407 30, B23B 2700, B23C 502
Patent
active
052861449
ABSTRACT:
An apparatus and method for cutting a hole in a liner installed in a conduit. Included in the apparatus is a carriage and a cutting head that are rotated to cut the liner. A lateral axis extends through the carriage. A skid constrains the carriage and the cutting head. The cutting head is substantially positioned over the center of gravity of the carriage to provide stability during cutting. The cutting head moves vertically with the use of a cam. The cutter also moves laterally and may rotate about the axis when cutting the hole. Prior to cutting the hole, the skid extends outward to hold the carriage in place. The apparatus also includes a specialized cutter having cutting bars along its outside perimeter and along its top surface.
REFERENCES:
patent: 2786218 (1957-03-01), Yousem
patent: 2960312 (1960-11-01), Kandle
patent: 3075594 (1963-01-01), Creel
patent: 4197908 (1980-04-01), Davis et al.
patent: 4986314 (1991-01-01), Himmler
Briggs William
Stewart Steven C.
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