Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Condition responsive means for modifying working member...
Patent
1978-02-17
1980-11-11
Hershkovitz, Abraham
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Condition responsive means for modifying working member...
60406, 91447, 91459, 91461, F15B 1100
Patent
active
042325889
ABSTRACT:
An electronically controlled pipe fracture safety device for operating devices which are fed by a hydraulic pump and which are actuated by a control slide value by means of hydraulic cylinders. Control lines branch off from lines which lead from the hydraulic pump via a control slide valve to the hydraulic cylinders, the control lines feeding the hydraulic medium to a differential flow monitor, on the piston of which a permanent magnet is fastened. The latter, by means of a reed contact as a result of a pressure difference existing between the control lines, which pressure difference is brought about by damage or fracture of a line, produces a signal in the NOR gate, the latter forming the input of a scoring logic. This signal retransmits a self-holding signal to NAND-gates which form a flip-flop. The self-holding signal causes deenergization of a relay and consequently an interruption of the current flow to the control slide valve and brings about the locking position of the latter.
REFERENCES:
patent: 3125856 (1964-03-01), Branson
patent: 3960286 (1976-06-01), Spooner
patent: 4031813 (1977-06-01), Walters
patent: 4091715 (1978-05-01), Ouderka
patent: 4102248 (1978-07-01), Martz
Pyschik Werner
Ziplies Herbert
Farber Martin A.
Hershkovitz Abraham
O & K Orenstein & Koppel Aktiengesellschaft
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