Drilling holes in pressurized pipes

Details Drilling holes in pressurized pipes Drilling holes in pressurized pipes

1977-01-03

1978-09-05

Simpson, Othell M.

Cutting by use of rotating axially moving tool

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

Movable relative to tool along tool-axis

408 1R, 137318, B23B 4108, B23B 3500

Patent

active

041115880

ABSTRACT:
An apparatus for drilling pipes or containers under pressure employing a drill support device attachable to a surface of the pipe or container and having peripheral sealing means between said device and said container. A seal across an aperture in said device has sectoral leaves normally closed by the pressure to seal the aperture but able to be opened inwards to pass a drill.

REFERENCES:
patent: 3131712 (1964-05-01), Risley et al.
patent: 3240227 (1966-03-01), Burkholder

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