Closure fasteners – Magnetic
Patent
1988-06-29
1991-01-01
Gall, Lloyd A.
Closure fasteners
Magnetic
248 271, 248558, 248602, 335279, 403 4, E05C 1916
Patent
active
049813129
ABSTRACT:
An electromagnetic shear lock comprising an electromagnet having an E-shaped cross section with a coil positioned about the middle leg of the E is mounted to a doorway and an armature is mounted to the door, where in one form the middle leg of the E is shortened to define a recess to receive an elongated armature member and provide mechanical reinforcement against shearing when the electromagnet is energized. The armature is constructed of at least two telescoping members where the outer armature member is U-shaped with legs which contact the outer legs of the electromagnet and the inner member is attracted into the defined recess and will engage the inner surfaces of the outer legs of the electromagnet. Even if the outer member is pryed down from the electromagnet, at least the inner armature members will still be in a magnetic circuit with the inner electromagnet armature member in the defined recess and providing mechanical reinforcement in engaging the inner surfaces of the outer legs. The invention further provides a new and improved structure for mounting the armature to a door.
REFERENCES:
patent: 2584707 (1952-02-01), Jarvis et al.
patent: 2673626 (1954-03-01), Bastin
patent: 2801870 (1957-08-01), Davey
patent: 2812965 (1957-11-01), Horvay
patent: 2906553 (1959-09-01), Wilson
patent: 3204154 (1965-08-01), Crandell
patent: 3993972 (1976-11-01), Barbrook
patent: 4439808 (1984-03-01), Gillham
patent: 4487439 (1984-12-01), McFadden
patent: 4491816 (1985-01-01), Blum
patent: 4562665 (1986-01-01), Blackston
patent: 4645089 (1987-02-01), Horsley
patent: 4652028 (1987-03-01), Logan et al.
patent: 4682801 (1987-07-01), Cook et al.
patent: 4688012 (1987-08-01), Bohg et al.
patent: 4703962 (1987-11-01), Kelly et al.
patent: 4716393 (1987-12-01), Logie
patent: 4720128 (1988-01-01), Logan, Jr. et al.
Gall Lloyd A.
Harrow Products Inc.
Montgomery Robert H.
LandOfFree
Electromagnetic shear lock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromagnetic shear lock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic shear lock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1992503