Load-sensing active hydraulic control device

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EP 0 684 388 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.11.1996 Bulletin 1996/45

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

(21)	Application number: 95202288.7

(22)	Date of filing: 23.12.1992

(51)	International Patent Classification (IPC)⁶: F15B 11/05

(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 Sagamihara-shi, Kanagawa-ken (JP) Yonekubo, Yoshitake Setagaya-ku, Tokyo (JP) Nishiumi, Kenichi Tama-ku, Kawasaki-shi, Kanagawa-ken (JP) Hasegawa, Yoshimi Yachiyo-Dai, 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)	Load-sensing active hydraulic control device

(57) A load-sensing active hydraulic control device which includes a service port connected to a breaker or scissors in a power shovel of the like and is capable of preventing an excessive increase in pressure on the side of the service port from affecting other actuators. An on-off valve (34) is connected to a load detecting passage (33) of a change-over valve (3) connected to the side of a service port and is closed to prevent a pressure on the side of the service port from being fed back to a regulator when a load pressure on the side of a main actuator (2) is equal to or exceeds a set pressure.

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