Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1988-02-16
1989-06-20
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307117, 340565, 361180, H01H 3500, G08B 1300
Patent
active
048411639
ABSTRACT:
A proximity switch immune to interference fields includes an oscillator circuit (1) that can be influenced by a permanent magnet, this circuit being damped in the basic condition by a core of a coil (13), which core consists of an amorphous metal, and being undampable by the approach of the permanent magnet. In order to prevent triggering of the proximity switch by a magnetic alternating field, a signal evaluating circuit (2), yielding a switching signal corresponding to the undamped condition of the oscillator circuit (1), and a signal evaluating circuit (8) are connected to the oscillator circuit output (17). The signal evaluating circuit (8) detects an output signal produced by a magnetic alternating field separately as interference and blocks, by way of a blockable holding circuit (5), the switching signal path so long as a magnetic alternating field is present.
REFERENCES:
patent: 4037221 (1977-07-01), Alexander
patent: 4250432 (1981-12-01), Kohler
patent: 4307387 (1981-12-01), Baxendale
patent: 4587486 (1986-05-01), Soyck
patent: 4651022 (1987-03-01), Cowley
patent: 4673827 (1987-06-01), Summer
patent: 4719362 (1988-01-01), Nest et al.
Logan Sharon D.
Shoop Jr. William M.
Werner Turck GmbH & Co. KG.
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