| (19) |
 |
|
(11) |
EP 0 038 125 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
11.11.1981 Bulletin 1981/45 |
| (43) |
Date of publication A2: |
|
21.10.1981 Bulletin 1981/42 |
| (22) |
Date of filing: 23.03.1981 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE FR GB IT LI LU NL SE |
| (30) |
Priority: |
24.03.1980 US 132951
|
| (71) |
Applicant: REED ROCK BIT COMPANY |
|
() |
|
| (72) |
Inventor: |
|
- Schumacher, Percy William
()
|
|
| |
|
| (54) |
Rolling cutter drill bit |
(57) This invention discloses a rolling cone drilling bit (10) having a plurality of cutters
(16) which have inserted therein hard metal cutting elements (22) preferably formed
of tungsten carbide alloy; and in which bit the rolling cone cutters (16) are located
in such a manner that their rotational axes (32) are greatly offset from the rotational
axis (34) of the drill bit.