The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 1985
Filed:
Feb. 26, 1982
Heinz Kammerer, Ostfildern, DE;
Hans Langheinrich, Leonberg-Silberberg, DE;
Gebhard Balluff Fabrik feinmechanischer Erzeugnisse GmbH & Co., Neuhausen, DE;
Abstract
The invention relates to a testing and evaluating circuit for a proximity itch suitable for testing and provided as an element of a machine control means; associated with the proximity switch is a control circuit, by which the proximity switch is alternately switchable between its two operating conditions to generate a timed output signal with a given frequency, an evaluating circuit being provided, by which a clear signal indicating fault-free operation is producable for the duration of a timed output signal from the proximity switch and by which a blocking signal for the machine control means, indicating a fault, is producable in the absence of changes in the potential of the output signal from the proximity switch. The evaluating circuit preferably comprises a relay circuit, to which the output signal from the proximity switch or a signal derived from this is fed via a transformer.