Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches
Patent
1996-06-06
1999-08-17
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
307113, 200 6145M, H01H 900
Patent
active
059399619
ABSTRACT:
An electric locking device includes at least one main switch with a make contact, one secondary magnetic flexible leaf switch with a break contact, at least one auxiliary relay including at least one make contact, and an external control member comprising at least one permanent magnet. The main switch directly controls the relay coil after the secondary switch has been opened by the presence of a magnet in the control member, and the secondary switch, when it closes again, shorts the relay coil. This occurs when the control member and the magnet moves away. The assembly may be constructed such that the approach of the control member, by the presence of the magnet, first causes the opening of the secondary switch, then the closing of the main switch. The control member, during its retraction, releases the main switch that opens before the secondary switch closes. The secondary switch is never crossed by a current except in the case of a failure of the main switch, or during an attempt to tamper the locking device, causing the closure of the main switch without opening the secondary switch.
REFERENCES:
patent: 4349814 (1982-09-01), Akehurst
patent: 4357892 (1982-11-01), Sveinsbo et al.
patent: 5239202 (1993-08-01), Hostetler
patent: 5311068 (1994-05-01), Miller
patent: 5416293 (1995-05-01), Reneau
patent: 5458508 (1995-10-01), Sawada
French Search Report. Mar. 4, 1996.
Donovan Lincoln
Robot Coupe (S.N.C)
LandOfFree
Electric safety locking device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric safety locking device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric safety locking device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-318599