SECURITY SYSTEM AND LOCK THEREFOR

• US 3,866,164 A
• Filed: 05/22/1973
• Issued: 02/11/1975
• Est. Priority Date: 05/22/1973
• Status: Expired due to Term

• Current Assignee: Francis Peterson
• Original Assignee: Francis Peterson
• Inventors: Peterson, Francis C.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US05/362,662
• Time in Patent Office: 630 Days
• Field of Search: 340/274 200/61.67,61.64,61.93
• US Class Current: 340/522
• CPC Class Codes: E05B 45/06 Electric alarm locks E05B45/005 takes precedence
• CPC Class Codes: Y10T 292/1082 Motor

Abstract

A security system includes a lock for securing a door and an alarm to signal when the door is ajar. The lock has a latch bolt which projects into a keeper in the door frame and an operating mechanism for retracting the latch bolt. A key operated locking device when locked prevents the operating mechanism from retracting the latch bolt. When the key operated locking device is unlocked with the proper key to enable the latch bolt to be retracted, a switch closes to deactivate the alarm long enough to enable one to open the door, pass through the door opening, and then close the door.

Claims

1. In a security system including a door which opens from a door frame having a strike thereon, an alarm connected with the door for signalling when the door is open, and a lock for securing the door in a closed position, the lock including a latch blot which is normally urged beyond the edge of the door for engagement with the door frame to secure the door in a closed position, and movable operating means engageable with the latch bolt to retract the latch bolt when the operating means is moved, the latch bolt being retractable independently of the operating means to enable the latch bolt to retract upon engaging the strike of the door frame without moving the operating means;

the improvement comprising switch means connected to the alarm for deactivating the alarm for a limited time when said switch means is operated, the switch means being operatiedby the operating means when the operating means is moved such that it retracts the latch bolt.

2. The structure according to claim 1 wherein the operating means includes a key-operated locking device.

3. The structure according to claim 2 and further characterized by a hinge having one leaf fastened to the door frame, and another leaf fastened to the door, and contact means carried by the leaves for completing an electrical circuit between the switch and the alarm when the door is closed.

4. The structure according to claim 1 wherein the operating means further includes a stem connected with the latch bolt and a handle engageable with the stem for retracting the latch bolt when the handle is turned, the switch being positioned in the path of the stem so that it is operated by the stem as the latch bolt is retracted.

5. The structure according to claim 4 wherein the operating means further includes a key operated locking mechanism for preventing rotation of the handle.

6. The structure according to claim 1 wherein the operating means includes a key operated tumbler cylinder having a tab which rotates as the cylinder is turned and retracts the latch bolt, the switch means being located in the path of the tab and being operated by the tab as the cylinder is turned.

7. The structure according to claim 1 wherein the operating means includes a handle which is exposed outside the door and when turned withdraws the latch bolt;

and wherein a key operated locking device is in the handle and prevents the handle from rotating when in a locked condition.

8. The structure according to claim 7 wherein the operating means further includes a stem and the handle is connected with the stem such that when the handle is turned the stem is moved and the latch blot is retracted;

and wherein the switch is engaged and Operated by the stem.

9. The structure according to claim 1 wherein the key operated locking device includes a lock cylinder secured to the case and having a rotatable tumbler cylinder which rotates in the lock cylinder and receives the key;

and wherein the operating means includes a tab which is fastened to the tumbler cylinder and rotates with the tumbler cylinder, the switch being in the path of tab and being operated by the tab as the tumbler cylinder rotates.

10. A security system for a door hinged to a door frame having a strike thereon, said security system comprising an alarm, a lock having a retractable latch bolt which is normally urged outwardly beyond the edge of the door to project into the strike and thereby secure the door, the latch bolt having a face which engages the strike as the door closes and causes the latch bolt to be retracted momentarily, a manually operated mechanism engageable with the latch bolt to retract the latch bolt, the latch bolt being retractable independently of the manually operated mechanism so that the latch bolt does not move the manually operated mechanism when so retracted;

means for actuating the alarm when the door is opened, and switch means actuated by the manually operated mechanism and connected to the alarm for deactivating the alarm for a limited time when the latch bolt is retracted by the manually operated means.

11. A security system according to claim 10 and further characterized by a hinge for supporting the door on the door frame having contacts and contactors thereon, the switch means being connected to the alarm through contacts and contactors of the hinge.

12. A security system according to claim 11 wherein at least some of the contacts and contactors of the hinge break when the door is opened and the breaking of said contacts and contactors actuates the alarm if the alarm has not been deactivated by the switch means.

13. A security system according to claim 10 wherein the operating mechanism includes a key operated lock having a rotatable cylinder which is rotated by a key inserted therein, and a tab on the cylinder, the switch means being in the path of the tab so that the tab operates the switch means as the tab is rotated by the cylinder to retract the latch bolt.

14. A security system according to claim 10 wherein the operating mechanism includes a stem projected beyond the latch bolt in the direction the latch bolt moves, the stem being connected with the latch bolt such that when the stem is moved away from the edge of the door from which the latch bolt projects, the latch bolt is retracted and such that the latch bolt can be retracted without moving the stem, a spindle projected through the stem and having edges which contact the stem and move the stem as the spindle is turned, and at least one handle connected firmly to the stem and exposed at the exterior of the door for turning the stem.

15. A security system according to claim 10 and further comprising a second manually operated mechanism engageable with the latch bolt to retract the latch bolt, the second manually operated mechanism including a handle exposed at the exterior of the door;

a dogging mechanism engageable with the second manually operated mechanism to dog the second mechanism and prevent it from retracting the latch bolt, and another switch means operable by the dogging mechanism for monitoring the position of the dogging mechanism.

16. A security system according to claim 10 and further comprising a locking lever movable between a blocking position wherein it prevents retraction of the latch bolt and a release position wherein it permits the latch bolt to retract, an auxiliary latch which is located opposite the strike and depressed by the strike when the door is closed, but when the door is open extends beyond the strike, the auxiliary latch when extended holding the locking lever in its release position and when depressed allowing the locking lever to move to its blocking position, and additional switch mEans operated by the locking lever for monitoring the position thereof.