Safety switching system for a working apparatus

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

361187, 307113, 3071418, 324523, 340644, 340687, 34082518, H02H 300

Patent

active

055439977

ABSTRACT:
A safety switching arrangement for the switching on and off of the power supply (11) of two actors (12a, 12b) for example relays, which, in dependence on the switching on of the current, and in dependence on a sensor switching signal (13a, 13b) jointly set a working apparatus (22) in operation, the safety switching arrangement comprising two main switches (14a, 14b) arranged between the power supply (11) and each preferably earthed actor (12a, 12b). In each case a controllable normally closed auxiliary switch (16a, 16b) is arranged between the sensor signal input (15a, 15b) and the main switches (14a, 14b) and, with the main switch (14a, 14b) closed by the application of a sensor closing signal, is briefly opened by a test generator (45) to provide a test pause via a first control input (19a, 19b) at regular time intervals offset timewise to the other respective auxiliary switch (16b, 16a) so that, in each case, the brief opening of the associated main switch (14a, 14b) brought about--in the troublefree state of the associated switch (14a, 14b)--is not sufficient as a result of the inertia of the actors (12a, 12b) to set the attached working apparatus (22) out of operation. A test circuit (18a, 18b; 21a, 21b, 24a, 24b; 27a, 27b; 36a, 36b) is provided which examines during the test pause whether the main switch (14a, 14b) associated with the respective auxiliary switch (16a, 16b) is also open. On non-opening of a main switch (14a, 14b) during the test pause, the other respective auxiliary switch (16b, 16a) is set into the open state and is permanently maintained in this state.

REFERENCES:
patent: 5243336 (1993-09-01), Moonan et al.
patent: 5262676 (1993-11-01), Blumel et al.
Janning, Wolfgang, "Zweikanalige Pressensicherheitssteuerung mit einem speicherprogrammierbaren Steurungssystem", VDI-Z (1980) No. 1/2. pp. 17-20 no month.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Safety switching system for a working apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Safety switching system for a working apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety switching system for a working apparatus will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2195988

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.