Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1977-12-06
1980-03-04
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318565, 318663, 318678, G05B 902
Patent
active
041919130
ABSTRACT:
In a servo system for manipulating a displaceble member in response to movement of a control through corresponding changes of position, which operates by comparing an electrical signal representative of the position of the control with an electrical signal representative of the position of the displaceable member to provide error signals which can drive the displaceable member in either of two opposite directions, a safety interlock circuit is provided which detects the presence of an error signal in either direction immediately after the application of operating voltage or immediately after the switching of the machinery into a different mode of operation and locks the displaceable member in position if an error signal initially appears until the error signal is cancelled by bringing the manual control into a position corresponding with that of the displaceable member. Unexpected sudden movements that may endanger personnel are thereby prevented. The invention is illustrated with reference to mobile agricultural machinery.
REFERENCES:
patent: 3578871 (1971-05-01), Sakamoto
patent: 4030012 (1977-06-01), Buhler
patent: 4037519 (1977-07-01), Miller et al.
patent: 4078750 (1978-03-01), Tomlinson
Arnold Winfried
Kubach Hans
Dobeck Benjamin
Robert & Bosch GmbH
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