# US 2016/0251884 A1 · Manufacturing method of an attraction plate for electromagnetic door locks

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- Number: US 2016/0251884 A1
- Document ID: US20160251884A1
- Status: Published application
- Kind: A1
- Application number: 15/151,660
- Filed: 2016-05-11
- Published: 2016-09-01
- Earliest claimed: 2014-01-23
- Inventors: YI-FAN LIAO
- Web page: https://patentgrep.com/patent/US20160251884A1

## CPC

- H01F 41/02: for manufacturing cores, coils, or magnets (H01F41/14 takes precedence; for dynamo-electric machines H02K15/00)
- E05C 19/166: {electromagnetic}
- E05C 19/168: {a movable bolt being electromagnetically held in the striker by electromagnetic attraction}
- H01F 41/0253: {for manufacturing permanent magnets}
- Y10T 29/4902: Electromagnet, transformer or inductor
- Y10T 29/49075: including permanent magnet or core
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- E05C: BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS (latching means for sideboard or tailgate structures for vehicles B62D, {B62D33/02}; fastening devices for constructional or engineering elements E04, F16B; locks, fastening devices structurally or operatively combined or having significant cooperation with locks E05B; means for operating or controlling wing fasteners in conjunction with mechanisms for moving the wing E05F)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A manufacturing method of an attraction plate for electromagnetic door locks has an attraction plate positioned on a mounted body with a positioning hole at the center thereof. The attraction plate further has an arch portion at the center thereof which is reversely proportional to a thickness thereof and the thickness thereof is pre-determined for manufacturing a different height of the arch portion thereof for better effects. With an internal stress from the curved design, a tensile value of a door lock is increased for better operation of a door lock.

## Claims

### Claim 1

A manufacturing method of an attraction plate for electromagnetic door locks, comprising:
a) providing an electric magnet in a long shape;
b) providing a mounted body disposed at a corresponding side to the electric magnet with a positioning hole arranged in the middle thereof;
c) providing an attraction plate with a thickness between 10-16 mm and a length in correspondence to the length of the electric magnet, said attraction plate including an attraction surface at a side facing the electric magnet;
d) deciding a thickness of the attraction plate to determine a height of an arch portion arranged at the center on the attraction surface, the thickness of the attraction plate being inversely proportional to the height of the arch portion and the height being between 0.04-0.27 mm with the thickness of the attraction plate being between 10-16 mm;
e) manufacturing the attraction plate according to pre-determined numbers of thickness and height in step d, the attraction plate having two corresponding convex-curve surfaces extending from the arch portion to both ends of the attraction plate, defining the arch portion a higher central region than both ends of the attraction plate;
f) providing the attraction plate manufactured in steps c-e, which has an engaging hole correspondingly arranged to the positioning hole; and
g) providing a bolt to fixedly screw the engaging hole to the positioning hole for placement of the attraction plate on the mounted body with the attraction surface thereof facing upward, defining both ends thereof as free ends.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein
the arch portion has a height between 0.22-0.27 mm when the attraction plate has a thickness of 10 mm;
the arch portion has a height between 0.17-0.22 mm when the attraction plate has a thickness of 11 mm;
the arch portion has a height between 0.12-0.17 mm when the attraction plate has a thickness of 12 mm;
the arch portion has a height between 0.10-0.12 mm when the attraction plate has a thickness of 13 mm;
the arch portion has a height between 0.08-0.10 mm when the attraction plate has a thickness of 14 mm;
the arch portion has a height between 0.06-0.08 mm when the attraction plate has a thickness of 15 mm; and
the arch portion has a height between 0.04-0.06 mm when the attraction plate has a thickness of 16 mm.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the mounted body is a box-shaped body, a U-shaped body, a L-shaped body, a flat body, or a door plate.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the mounted body further has a pad disposed between the attraction plate and the mounted body.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the engaging hole is a spot-faced hole.