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United States Patent | 3,566,147 |
February 23, 1971 |
A control device for plants comprising any number of electromotor-driven machines or equivalent units which comprises a corresponding number of supervising elements which in response to some operating characteristic of the plant connects one or more units in a certain sequence and disconnects them in an opposite sequence. After a predetermined time or due to some mechanical or manual impulse the sequence is changed so that the units are connected and disconnected in a new sequence. After repeated changes of sequence the device returns to the original sequence.
Inventors: | Carl Johan Masreliez (Renton, WA) |
Assignee: |
Atlas Copco Aktiebolag, Nacka, SE
( |
Appl. No.: | 04/706,883 |
Filed: | February 20, 1968 |
Feb 21, 1967 [SE] | 2342/67 | |||
Current U.S. Class: | 307/41 ; 307/39 |
Current International Class: | G05D 16/20 (20060101); G05B 11/32 (20060101); H02j 003/00 () |
Field of Search: | 307/41,39,38,40,42,31,32,33,34,35,11 |
2881832 | April 1959 | Leonard |
2963590 | December 1960 | Schultz et al. |
3379894 | April 1968 | Carsten |
2864049 | December 1958 | Sheets |
3261980 | July 1966 | McCartney et al. |