WATCHMAN'S TOUR ALARM SYSTEM

• US 3,774,193 A
• Filed: 08/24/1972
• Issued: 11/20/1973
• Est. Priority Date: 08/24/1972
• Status: Expired due to Term

• Current Assignee: Tulio Vasquez Restrepo
• Original Assignee: Tulio Vasquez Restrepo
• Inventors: Restrepo, Tulio Vasquez
• Primary Examiner(s): Caldwell, John W.
• Assistant Examiner(s): Wannisky, William M.
• Application Number:
  US05/283,393
• Time in Patent Office: 453 Days
• Field of Search: 340/305,306,309.1,309.4,309.5,311,312 346/144 58/152B
• US Class Current: 340/306
• CPC Class Codes: G07C 1/20 Checking timed patrols, e.g. of watchman
• CPC Class Codes: G07C 9/29 the pass containing active electronic elements, e.g. smartcards

Abstract

An alarm system establishes, according to a preset program, the order and the minimum time schedule to be followed by a watchman in checking control stations on his vigilance rounds. The watchman carries a portable control assembly which must be plugged into each fixed control station in the proper order and after the elapse of a minimum time before the portable control assembly will shift to correspond to the next fixed control station. If the entire round is not completed and the portable control assembly plugged into a main control station within a predetermined time, an alarm will be triggered.

Claims

2. conveying to a first comparison station a portable signal giving means for providing said proper signal only when a program of comparisons have been completed;

3. connecting said portable signal giving means to said first comparison station and if there is a positive comparison, automatically advancing said signal giving means to the second in said program oF comparisons;

4. conveying connecting said portable signal giving means to each subsequent comparison station and advancing said signal giving means through the entire program of comparisons, thereby completing said program of comparisons;

and

5. conveying and connecting said signal giving means to said central control system and providing said proper signal thereto thereby interrupting the running of said predetermined period of time.

6. An alarm apparatus in accordance with claim 1, wherein:

said fixed control means each comprise a resistor and capacitor pair of a predetermined electrical reactance;

said comparison elements each comprise a resistor and capacitor pair of a predetermined electrical reactance; and

said portable control means compares the reactances of said fixed control means and said comparison elements by means of a Wheatstone bridge circuit.

7. An alarm apparatus in accordance with claim 1 wherein:

said fixed control means further includes a socket means attached thereto for receiving a plug and for electrically connecting said plug with said electrical reference sample; and

said portable control means further includes a plug means attached thereto for insertion into said socket means to electrically connect said portable control means with said fixed control means.

8. An alarm apparatus in accordance with claim 1 wherein, in said central control means:

said alarm means comprises at least one alarm light and alarm timing means for triggering a second general alarm means if said proper signal is not fed into said central control means within a time period as determined by said alarm timing means wherein said alarm timing means is activated upon triggering of said alarm by said central control means.

9. A method of protecting an area, comprising the steps of: