Injection unit for die-casting machines

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(11)

EP 0 442 247 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	17.03.1993 Bulletin 1993/11

(43)	Date of publication A2:
	21.08.1991 Bulletin 1991/34

(21)	Application number: 90830543.6

(22)	Date of filing: 20.11.1990

(51)	International Patent Classification (IPC)⁵: B22D 17/20, B22D 17/32

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

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Priority:

16.02.1990 IT 692790 U

(71)	Applicant: M.G.P. ITALIA S.r.l.
	I-25030 Castelmella (Brescia) (IT)

(72)	Inventor:
	Corini, Giuliano I-25062 Concesio, Brescia, S. Vigilio (IT)

(74)	Representative: Manzoni, Alessandro
	MANZONI & MANZONI, UFFICIO INTERNAZIONALE BREVETTI, P.le Arnaldo 2 I-25121 Brescia I-25121 Brescia (IT)

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References cited: :

(54)	Injection unit for die-casting machines

(57) This invention relates to an injection unit for die-casting machines, which includes: an injection piston (11) driven and movable in a cylinder (12); a first gas accumulator (13) which connects to a reserve tank for gaseous fluids (16) on one side and on the other side, to said cylinder (12), through a pump and valvular means (17,19) to operate the slow and rapid feed motion of the injection piston (11); and a second gas accumulator (20) connected to a multiplier cylinder (14) on one side and on the other side to a pump with adjustable force valves (23,24) to operate a final compression stage with the use of the injection piston (11).

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