192 clutches and power-stop control – Stop mechanism – Safety device
Patent
1977-11-25
1980-03-11
Herrmann, Allan D.
192 clutches and power-stop control
Stop mechanism
Safety device
83 58, 83 61, 83554, 83617, 91356, 100 53, 192134, B26D 724, F16B 1115
Patent
active
041924142
ABSTRACT:
An arrangement for protecting tools in a hydraulic press against overloading if an object is present in a tool space of the hydraulic press. A displacement switch monitors at least a portion of a path of movement of a press ram with an additional switching device providing an output signal during a predetermined movement of the press ram. A control circuit evaluates a sequence of the output signals of the displacement switch and additional switching device in such a manner that a fault signal is formed when the additional switching device provides an output signal prior to an output signal from the displacement switch. The additional switching device may be constructed as a switch element which provides an output signal in dependence upon a pressure or a speed of flow of a pressure medium in a hydraulic circuit.
REFERENCES:
patent: 2216973 (1940-10-01), Harrington et al.
patent: 2250389 (1941-07-01), Miller
patent: 2400486 (1946-05-01), Carlyle
patent: 2805447 (1957-09-01), Voges
patent: 3452399 (1969-07-01), Blumer
patent: 3568553 (1971-03-01), Wanner
patent: 3991639 (1976-11-01), Pfeifer
patent: 4010679 (1977-03-01), Dybel
patent: 4060160 (1977-11-01), Lieber
Herrmann Allan D.
SMG Suddeutsche Maschinenbau Gesellschaft mbH
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