Patent ID: 9341007
Filing Date: 2016-05-17
CPC Classification: E05C,Y10T

Claim Text:
1. A structure improvement of attraction plate of electromagnetic doorlock, comprising: an electric magnet; an attraction plate, having an attraction surface, the attraction surface arranged at a corresponding surface of the electric magnet, and the attraction plate positioned on a mounted body; and; a positioning assembly positioned on the mounted body at a position close to opposing ends of the attraction plate, the attraction surface has a recessed portion below a horizontal plane of 0.06 mm to 0.26 mm at a central region thereof, and the recessed portion extends towards both ends to form an arc surface defining a bowed surface forming an arcuate recess between the attraction plate and the electric magnet, so that a concave-arc surface is formed with both ends above the central region; the attraction plate being devoid of any positioning member at a location between the opposing ends of the attraction plate, whereby when the attraction plate is attracted by the magnetic force produced by the electric magnet, the concave-arc surface is forced to deform for abutting the electric magnet; when the mounted body is pulled in an opposite direction of the electric magnet, both ends of the attraction plate under the tension of a positioning assembly is corresponding to both ends of the electric magnet to enhance the tensile value of the attraction plate.