Apparatus for boring sewer pipe opening in manhole base

Details Apparatus for boring sewer pipe opening in manhole base Apparatus for boring sewer pipe opening in manhole base

1978-06-12

1980-09-16

Briggs, William R.

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

Frictionally engaging sides of opening in work

173 35, 408 87, 408 88, B23B 4100

Patent

active

042226872

ABSTRACT:
Apparatus for boring a sewer pipe opening in the side wall of a concrete manhole base including a supporting frame adapted to be positioned over the open end of a vertically disposed manhole base. A second frame is suspended from the supporting frame and adapted to be lowered thereby into the interior of the manhole base. Hydraulically actuated jaws on the second frame engage opposite points on the inner surface of the side wall of the manhole base so as to secure the second frame at a selected location. A boring bit-driving motor is mounted on the second frame for transverse movement thereon with respect to the axis of the manhole base thereby to bore the sewer pipe opening outwardly through the side wall thereof.

REFERENCES:
patent: 2886290 (1959-05-01), Bremnan et al.
patent: 3370654 (1968-02-01), Skendrovic
patent: 3370888 (1968-02-01), Skendrovic
patent: 3446292 (1969-05-01), Stauffer
patent: 3473616 (1969-10-01), Johanssan
patent: 4009545 (1977-03-01), Rossborough

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