Motors: expansible chamber type – With motive fluid valve – Electrically operated
Patent
1996-05-22
1997-05-27
Nguyen, Hoang
Motors: expansible chamber type
With motive fluid valve
Electrically operated
91461, F16D 3102
Patent
active
056321902
ABSTRACT:
To provide a burglarproof device for a hydraulic machine which has a high degree of security against burglary, ensures high safety, and can be simply installed in a location where the device is hard to find for burglars, a solenoid valve 23 of a burglarproof device 20 is installed in a pilot primary pressure line 3 between a pilot hydraulic pump 1 and a pilot valve device 4. Unless ten numeral keys 21a of a key input device 21 are depressed in the order of the password, an unlocking electronic circuit 22K does not generate an unlock signal and the solenoid valve 23 keeps the pilot primary pressure line 3 cut off. Therefore, a pilot primary pressure from the pilot hydraulic pump 1 is shut off and, even with a manual lever 4c of the pilot valve device 4 operated, no pilot secondary pressure is produced and a main control valve 6 is kept standstill. As a result, a hydraulic cylinder 8 is not operated and the hydraulic machine is unable to move.
REFERENCES:
patent: 4615355 (1986-10-01), Garcia et al.
patent: 4876649 (1989-10-01), Kawai et al.
patent: 5138838 (1992-08-01), Crosser
patent: 5149940 (1992-09-01), Hosseini et al.
patent: 5441298 (1995-08-01), Miller et al.
patent: 5477770 (1995-12-01), Ono et al.
Hirata Toichi
Sunamura Kazuhiro
Tomikawa Osamu
Yoshinaga Shigehiro
Hitachi Construction Machinery Co. Ltd.
Nguyen Hoang
LandOfFree
Burglarproof device for hydraulic machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Burglarproof device for hydraulic machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Burglarproof device for hydraulic machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2321775