Control device for multiple hydraulic apparatus

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EP 0 684 389 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.10.1996 Bulletin 1996/44

(43)	Date of publication A2:
	29.11.1995 Bulletin 1995/48

(21)	Application number: 95202287.9

(22)	Date of filing: 23.12.1992

(51)	International Patent Classification (IPC)⁶: F15B 11/16

(84)	Designated Contracting States:
	DE FR GB

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Priority:

25.12.1991 JP 357128/91
16.07.1992 JP 212244/92
26.08.1992 JP 250517/92

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	92311770.9 / 0550257

(71)	Applicant: KAYABA INDUSTRY CO., LTD.
	Minato-Ku, Tokyo 105 (JP)

(72)	Inventors:
	Koiwai, Hideshi Toda-shi, Saitama-ken (JP) Naito, Hisato Kanagawa-ken (JP) Yonekubo, Yoshitake Setagaya-ku, Tokyo (JP) Nishiumi, Kenichi Kawasaki-shi, Kanagawa-ken (JP) Hasegawa, Yoshimi Yachiyo-shi, Chiba-ken (JP)

(74)	Representative: Carpmael, John William Maurice
	CARPMAELS & RANSFORD 43 Bloomsbury Square London, WC1A 2RA London, WC1A 2RA (GB)


	Remarks:
	This application was filed on 23 - 08 - 1995 as a divisional application to the application mentioned under INID code 60.

(54)	Control device for multiple hydraulic apparatus

(57) A control device for multiple hydraulic actuators which is capable of rapidly increasing a discharge pressure of a variable pump (1) to prevent a decrease in discharge quantity of the variable pump even when one of the actuators is required to be fed with hydraulic fluid in a micro-amount under a low pressure. An operating valve (42) of a spin motor (39) is connected on a downstream side thereof through a converging passage (44) to a feed side of a boom cylinder (37) and the converging passage is provided with a change-over valve (67) which is changed over to an open position when an operating valve (40) for operating the above-described boom cylinder is changed over.

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