Casing rotating device for drilling machines

(19)

(11)

EP 0 727 560 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	29.01.1997 Bulletin 1997/05

(43)	Date of publication A2:
	21.08.1996 Bulletin 1996/34

(21)	Application number: 96101254.9

(22)	Date of filing: 30.01.1996

(51)	International Patent Classification (IPC)⁶: E21B 3/02

(84)	Designated Contracting States:
	AT BE CH DE ES FR GB GR IT LI PT
	Designated Extension States:
	SI

(30)

Priority:

16.02.1995 IT UD950022

(71)	Applicant: CASAGRANDE SpA
	I-33074 Fontanafredda (PN) (IT)

(72)	Inventor:
	Casagrande, Sergio 33074 Fontanafredda (PN) (IT)

(74)	Representative: Petraz, Gilberto Luigi
	GLP S.r.l. Piazzale Cavedalis 6/2 33100 Udine 33100 Udine (IT)

(54)	Casing rotating device for drilling machines

(57) Casing rotating device (10) for drilling machines, the device being associated and coaxial with a device (13) for the rotation of a drilling tool for the obtaining of foundation piles, the drilling tool rotation device (13) having its own motor, the rotary casing-oscillator device (10) being located in a position below the drilling tool rotation device (13) and being associated with a reduction-gear and torque-multiplier transmission assembly (15,115).

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