ARRANGEMENT AND METHOD FOR CONTROLLING BOOM ACTUATING CYLINDERS IN ROCK DRILLING EQUIPMENT - Patent 0746668

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EP 0 746 668 A1

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(43)	Date of publication:
	11.12.1996 Bulletin 1996/50

(21)	Application number: 95909798.0

(22)	Date of filing: 24.02.1995

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International Patent Classification (IPC):

E21B 7/ 02^{( . )}
E21B 15/ 04^{( . )}

E21B 15/ 00^{( . )}
E21B 19/ 08^{( . )}

(86)	International application number:
	PCT/FI1995/000101

(87)	International publication number:
	WO 1995/023276 (31.08.1995 Gazette 1995/37)

(84)	Designated Contracting States:
	DE FR GB SE

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Priority:

28.02.1994 FI 19940000936

(71)	Applicant: TAMROCK OY
	SF-33330 Tampere (FI)

(72)	Inventor:
	MUONA, Jouko FIN-33430 Vuorentausta (FI)

(74)	Representative: Dahlström, Karl Krister, et al
	Oy Kolster Ab, Iso Roobertinkatu 23, P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)

(54)	ARRANGEMENT AND METHOD FOR CONTROLLING BOOM ACTUATING CYLINDERS IN ROCK DRILLING EQUIPMENT