(19)
(11) EP 0 651 133 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.08.1995 Bulletin 1995/32

(43) Date of publication A2:
03.05.1995 Bulletin 1995/18

(21) Application number: 94850192.9

(22) Date of filing: 28.10.1994
(51) International Patent Classification (IPC)6: E21C 35/183, E21B 10/46
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 03.11.1993 US 145223

(71) Applicant: SANDVIK AKTIEBOLAG
S-811 81 Sandviken 1 (SE)

(72) Inventor:
  • Andersson, Jan
    Bristol, Virginia 24201 (US)

(74) Representative: Taquist, Lennart et al
Sandvik AB Patent Department
811 81 SANDVIKEN
811 81 SANDVIKEN (SE)


(56) References cited: : 
   
       


    (54) Diamond/boron nitride coated excavating tool cutting insert


    (57) A diamond/cubic boron nitride coated low energy cutting insert (11) for an excavating tool. The insert includes a generally conical tip portion (12), an elongated intermediate portion (17), a shoulder (13) and a contact surface which attaches to a supporting surface (14A) of the tool body (10). The intermediate portion (17) of the insert includes a concave surface (17) portion and the coating is provided on the tip portion (12) and optionally on the intermediate portion (17) and the shoulder (13).






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