A DEVICE PERFORMING HAMMERING BY MEANS OF HYDRAULIC PRESSURE

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EP 0 885 092 A1

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(43)	Date of publication:
	23.12.1998 Bulletin 1998/52

(21)	Application number: 96924904.0

(22)	Date of filing: 31.07.1996

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International Patent Classification (IPC):

E21B 7/ 20^{( . )}
B25D 9/ 12^{( . )}
B25D 17/ 24^{( . )}

B25D 9/ 04^{( . )}
B25D 17/ 06^{( . )}
E02D 7/ 10^{( . )}

(86)	International application number:
	PCT/FI1996/000425

(87)	International publication number:
	WO 1997/004926 (13.02.1997 Gazette 1997/08)

(84)	Designated Contracting States:
	DE ES FI FR GB IT

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Priority:

31.07.1995 FI 19950003636
30.01.1996 FI 19960000434

(71)	Applicant: RAUNISTO, Airi
	SF-13210 Hämeenlinna (FI)

(72)	Inventor:
	RAUNISTO, Yrjö FIN-13210 Hämeenlinna (FI)

(74)	Representative: Nieminen, Taisto Tapani
	Patenttitoimisto T. Nieminen Oy, Kehräsaari B 33200 Tampere 33200 Tampere (FI)

(54)	A DEVICE PERFORMING HAMMERING BY MEANS OF HYDRAULIC PRESSURE