A HYDRAULIC ARRANGEMENT FOR TURNING THE ACTUATOR OF A ROCK DRILLING MACHINE - Patent 0824634

(19)

(11)

EP 0 824 634 A1

(12)

(43)	Date of publication:
	25.02.1998 Bulletin 1998/09

(21)	Application number: 96910978.0

(22)	Date of filing: 18.04.1996

(51)

International Patent Classification (IPC):

E21B 7/ 02^{( . )}
E21B 19/ 24^{( . )}

E21B 15/ 04^{( . )}
E21D 20/ 00^{( . )}

(86)	International application number:
	PCT/FI1996/000210

(87)	International publication number:
	WO 1996/033337 (24.10.1996 Gazette 1996/47)

(84)	Designated Contracting States:
	AT CH DE FR GB IT LI SE

(30)

Priority:

21.04.1995 FI 19950001913

(71)	Applicant: Tamrock Oy
	33100 Tampere (FI)

(72)	Inventors:
	LAUNIEMI, Markku FIN-37120 Nokia (FI) HUTTUNEN, Mikko FIN-33610 Tampere (FI)

(74)	Representative: Kaukonen, Juha Veikko, et al
	Kolster Oy Ab, Iso Roobertinkatu 23, P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)

(54)	A HYDRAULIC ARRANGEMENT FOR TURNING THE ACTUATOR OF A ROCK DRILLING MACHINE