Method of making a threaded retainer ring for a roller cutter on

Details Method of making a threaded retainer ring for a roller cutter on Method of making a threaded retainer ring for a roller cutter on

1990-02-05

1991-05-07

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

B21K 502

Patent

active

050127012

ABSTRACT:
A method of making a threaded ring (24) into two (2) semicircular portions (30, 32) for fitting within a groove (19) on a journal (12) of a drill bit (10) to retain a roller cutter (20) thereon. The ring (24) is first formed with screw threads (26) about an oversized outer diameter and then cut into two semicircular portions (30, 32). The amount of the oversized outer diameter compensates for the thickness of the material removed by the cut as shown at W. If the thickness of the cut exceeds a certain amount, yielding of the ring is provided as shown in FIGS. 3-7 to provide a permanent set to compensate for the thickness W of the material removed.

REFERENCES:
patent: 1010144 (1911-11-01), Hughes
patent: 2513634 (1946-04-01), Francis
patent: 3971600 (1976-07-01), Murdoch et al.
patent: 4491428 (1985-01-01), Burr et al.
patent: 4802539 (1989-07-01), Hall et al.

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