Access control devices of the electromagnetic lock module type

Patent metadata

Field	Value
Publication number	US-10077577-B2
Application number	US-201715472406-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Sep 18, 2011
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

An access control device including an electromagnetic lock module for selectively locking and unlocking a door in a door frame is provided. The access control device provides a lower profiled electromagnetic lock module to improve the aesthetics and functionality of the module, supports and integrates modern accessories such as CCTV, CCD cameras, passive motion detection with automatic background correction, digital notification display, automatic source voltage selection, door and lock status indicators, and ease of installation. The present invention further provides components and circuitry to enable connection of the electromagnetic control module to 12 or 24 volts DC or to an unfiltered rectified AC power supply.

First claim

What is claimed is:

1. An access control device comprising:
a controller comprising a first output and a second output;
a voltage selection and switching circuit in communication with said first output and said second output, wherein said voltage selection and switching circuit comprises a first coil and a second coil;
a first circuit path responsive to a first state of said first output and said second output wherein said voltage selection and switching circuit causes said first coil and said second coil to operate in a parallel configuration; and
a second circuit path responsive to a second state of said first output and said second output wherein said voltage selection and switching circuit causes said first coil and said second coil to operate in a series configuration.

2. The access control device in accordance with claim 1 , wherein a voltage is supplied to said controller thereby causing said controller to communicate said first state or said second state to said voltage selection and switching circuit.

3. The access control device in accordance with claim 2 , wherein said voltage is either 12v DC or 24v DC.

4. The access control device in accordance with claim 1 , wherein said first and second coils are automatically switched from one of said first state or said second state to the other in response to said supplied voltage.

5. The access control device in accordance with claim 1 , wherein said voltage selection and switching circuit further comprises a metal-oxide-semiconductor field-effect transistor (MOSFET) to minimize the input voltage drop when said first and second coils are in series or parallel.

6. The access control device in accordance with claim 5 further comprising a diode across said MOSFET to prevent back flow of current through said MOSFET when said MOSFET is turned off.

Assignees

• Hanchett Entry Systems Inc

Inventors

• Webb Michael A
• Corwin Larry Gene

Classifications

• G07C2209/62

  Comprising means for indicating the status of the lock · CPC title

• E05C19/166

  electromagnetic · CPC title

• E05B2047/0068

  Door closed · CPC title

• E05B17/226

  Displays on locks, e.g. LED or LCD screens (on handles E05B1/0084; on keys E05B19/0088) · CPC title

• E05B17/06

  Templates for marking the position of apertures in fittings of wings {or frames; Apparatus for installation of a lockset (drill jigs B23B47/28; mortised work B27F5/12; templates for hinges E05D11/0009)} · CPC title