Metal tools and implements – making – Blank or process – Drill
Patent
1978-04-21
1980-02-12
Simpson, Othell M.
Metal tools and implements, making
Blank or process
Drill
E21B 908
Patent
active
041877438
ABSTRACT:
This technique for manufacturing a rotary rock bit involves forming a rock bit leg segment having an upper pin end and a lower shirttail end including a socket having a semi-cylindrical faying surface transverse to the axis of the rock bit being formed. A separately formed journal insert includes a journal pin for mounting a rock bit cutter cone and a shirttail portion transverse to the axis of the journal pin. The insert has a semi-cylindrical faying surface on the shirttail portion coaxial with the journal pin. The insert is fitted into the rock bit leg segment with the semi-cylindrical faying surface on the insert mated with the semi-cylindrical socket surface on the bit leg segment. The semi-cylindrical faying surfaces are then electron beam welded. A cutter cone is assembled on the journal pin and three such rock bit leg assemblies are welded together to form a rock bit which is completed with conventional machining operations.
REFERENCES:
patent: 2321484 (1943-06-01), Harrington
patent: 2329751 (1943-09-01), Fermier
patent: 2654577 (1953-10-01), Green
patent: 2690935 (1954-10-01), Alexander
patent: 3850256 (1974-11-01), McQueen
patent: 3907191 (1975-09-01), Lichte
patent: 3987859 (1976-10-01), Lichte
patent: 4043411 (1977-08-01), Lichte
patent: 4045646 (1977-08-01), Lichte
patent: 4127043 (1978-11-01), Evans
Parker, Jr. Roscoe V.
Simpson Othell M.
Smith International Inc.
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