Control system for electromagnetic lock
AssigneeHarrow Products, Inc.
InventorsGary E. Lavelle, James P. Krul
Life of this patent
Estimating the term…
Abstract
An electromagnetic door lock has an electromagnet and an armature for bonding thereto. One of the electromagnet and the armature is adapted for mounting to a door and the other of the electromagnet and the armature is adapted for mounting to a door frame. A lock controller pulses current to the electromagnet. The pulses have a predetermined width and a predetermined spacing between pulses.
Claims24
An electromagnetic lock comprising:
- an electromagnet;
- an armature for bonding engagement to said electromagnet, one of said armature and said electromagnet being adapted for mounting to a door, and the other of said electromagnet and said armature adapted for mounting to a door frame;
- a status device for generating a door status signal indicative of the status of the door;
- and
- controller means for controlling initial pulses of current to said electromagnet, said initial pulses initiated in response to said door status signal and each said initial pulse having a preestablished initial pulse width and a preestablished initial pulse spacing between initial pulses.
A lock controller for an electromagnetic door lock comprising an electromagnet, an armature for electromagnetic bonding to said electromagnet and a power supply to provide current to said electromagnet, said lock controller compromising:
- switch means for switching said current to said electromagnet on and off;
- a door status switch for generating a door status signal indicative of the status of the door;
- and
- microcontroller means for controlling said switching of said switch means, said microcontroller means responsive to said door status signal to initiate switching said switch means to generate initial pulses of current, said initial pulses having a preestablished initial pulse width and a preestablished initial pulse spacing between pulses.
A method for operating an electromagnetic lock having an electromagnet and an armature for electromagnetic bonding thereto, said method comprising:
- monitoring the status of a door and generating a door status signal indicative of said status of the door;
- and
- pulsing current to said electromagnet in response to said door status signal, each pulse of current having a predetermined pulse width and a predetermined spacing of time between said pulses.
Dependencies are inferred from the claim text.