Touch bar release locking system

• US 4,871,204 A
• Filed: 09/08/1988
• Issued: 10/03/1989
• Est. Priority Date: 09/08/1988
• Status: Expired due to Term

• Current Assignee: Securitron Magnalock Corporation (Assa Abloy AB)
• Original Assignee: Securitron Magnalock Corporation (Assa Abloy AB)
• Inventors: Cook, Robert C., Barton, Mark R.
• Primary Examiner(s): MOORE, RICHARD
• Application Number:
  US07/241,585
• Time in Patent Office: 390 Days
• Field of Search: 292/251.5, 292/201, 292/144, 292/341.16, 292/336.3, 70/276, 70/277
• US Class Current: 292/251.5
• CPC Class Codes: E05B 47/0002 with electromagnets
• CPC Class Codes: E05B 47/0006 having a non-movable core; with permanent magnet
• CPC Class Codes: E05B 47/02 Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means by means in the striker E05B63/248
• CPC Class Codes: E05B 49/00 Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor arrangements for sensing or reading record carriers G06K7/00; mechanisms including electronic locks actuated by nonmechanical keys such as passive and active electrical keys and other data carriers G07C9/00, G07F7/00; electronic switching H03K17/00
• CPC Class Codes: E05B 65/108 Electronically controlled emergency exits
• CPC Class Codes: E05C 19/166 electromagnetic
• CPC Class Codes: G07C 9/00714 with passive electrical components, e.g. resistor, capacitor, inductor
• CPC Class Codes: Y10T 292/11 Magnetic
• CPC Class Codes: Y10T 292/57 Operators with knobs or handles
• CPC Class Codes: Y10T 70/7057 Permanent magnet

Abstract

The touch bar release locking system includes a hollow metal channel which affixes to a door at two points via insulating spacer blocks. Within the channel is housed a capacitive sensor which functions by detecting the additional capacitance coupled to the hollow channel by the act of a person touching it (even through gloves or clothing). When the additional capacitance is detected, a relay energizes and actuation of the relay contacts releases an electric lock which had been securing the door, thereby providing free egress. In the event of catastrophic sensor failure, egress can still be accomplished by pressing an electromechanical push button, mounted on the rear of the hollow channel, which duplicates the effect of energization of the sensor relay.

Claims

1. A quick release locking system comprising:

electromagnetic locking means for maintaining a door closed;

switch means for releasing said electromagnetic locking means to permit opening of the door;

circuit means having an input sensitive to increased capacitance for operating said switch means; and

a touch bar, including an extended conductive member coupled to the input to said circuit means, and means for mounting said bar on a door;

whereby when said bar is touched or pushed by a person seeking to pass through the door, the locking means is released and the door is free to open.

2. A system as defined in claim 1 where said circuit means is mounted in said bar.

3. A system as defined in claim 1 further comprising push button switch means for releasing said electromagnetic locking means, mounted on said bar.

4. A system as defined in claim 1 wherein said circuit means includes

(a) flip flop circuit means for operating said switch means, said flip flop circuit means including a clock input and a variable input for changing the state of said flip flop only when the variable input follows the clock input;

(b) a square wave oscillator;

(c) means for applying the output from said square wave oscillator to said clock input to provide a reference timing signal, and to said variable input with a delay dependent on the capacitance seen at said bar, whereby persons touching said bar delay the variable input and change the state of said flip flop circuit means.

5. A system as defined in claim 1 wherein said electromagnetic locking means is a large electromagnet and a strike plate or armature, mounted with one on the door frame and the other on the door.

6. A system as defined in claim 1 wherein said circuit means is mounted on a printed circuit board, and wherein said bar includes a pair of grooves for removably receiving said printed circuit board.

7. A system as defined in claim 1 wherein said bar is rectangular and insulated block means are provided for mountnng said bar to said door.

8. A touch operated control system comprising:

means having two states controlling a physical action;

switch means for changing the state of said controlling means;

circuit means having an input sensitive to increased capacitance for operating said switch means;

a touch means, including an extended conductive member connected to the input to said circuit means;

means for mounting said touch means where it may be manually touched by a person desiring to actuate the controlling means;

said circuit means including

(a) flip flop circuit means for operating said switch means, said flip flop circuit means including a clock input and a variable input for changing the state of said flip flop only when the variable input follows the clock input;

(b) a square wave oscillator;

(c) means for applying the output from said square wave oscillator to said clock input to provide a reference timing signal, and to said variable input with a delay dependent on the capacitance seen at said bar, whereby persons touching said bar delay the variable input and change the state of said flip flop circuit means.

9. A touch operated control system as defined in claim 8 wherein said means for controlling a physical action is an electromagnetic lock.

10. A touch operated control system as defined in claim 8 wherein said touch means is a bar, and means are provided for mounting said bar on a door.

11. A system as defined in claim 10 where said circuit means is mounted in said bar.

12. A system as defined in claim 10 further comprising push button switch means for changing the state of said controlling means mounted on said bar.

13. A touch operated control system comprising:

electric means having two states for controlling a physical action;

switch means for changing the state of said controlling means;

circuit means having an input sensitive to increased capacitance for operating said switch means;

a touch bar, including an extended conductive member connected to the input to said circuit means, and means for mounting said bar on a door; and

push button switch means for releasing said electromagnetic locking means, mounted on said bar;

whereby when said bar is touched or said push button is pushed by a person seeking to pass through the door, the electric means is switched from one state to the other.

14. A system as defined in claim 13 where said circuit means is mounted in said bar.

15. A system as defined in claim 13 wherein said circuit means includes

(a) flip flop circuit means for operating said switch means, said flip flop circuit means including a clock input and a variable input for changing the state of said flip flop only when the variable input follows the clock input;

(b) a square wave oscillator;

(c) means for applying the output from said square wave oscillator to said clock input to provide a reference timing signal, and to said variable input with a delay dependent on the capacitance seen at said bar, whereby persons touching said bar delay the variable input and change the state of said flip flop circuit means.

16. A touch operated control system as defined in claim 13 wherein said electric means for controlling a physical action is an electromagnetic lock.

17. A system as defined in claim 13 wherein said circuit means is mounted on a printed circuit board, and wherein said bar includes a pair of grooves for removably receiving said printed circuit board.

18. A system as defined in claim 13 wherein said bar is rectangular and insulated block means are provided for mounting said bar to said door.