Apparatus for cutting a hole in a pipe liner

Details Apparatus for cutting a hole in a pipe liner Apparatus for cutting a hole in a pipe liner

1993-10-15

1995-01-03

Briggs, William

Gear cutting, milling, or planing

Milling

Means for internal milling

166 552, B23C 502, E03F 306

Patent

active

053780922

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: 4577388 (1986-03-01), Wood
patent: 4648454 (1987-03-01), Yarnell
patent: 4657450 (1987-04-01), Forner et al.
patent: 4986314 (1991-01-01), Himmler
patent: 5105882 (1992-04-01), Ralston et al.
patent: 5197540 (1993-03-01), Yagi et al.
patent: 5238338 (1993-08-01), Stucky

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