Integrated impact detection and alarm system

• US 4,942,386 A
• Filed: 12/16/1988
• Issued: 07/17/1990
• Est. Priority Date: 12/16/1988
• Status: Expired due to Term

• Current Assignee: Billy R. Willis
• Original Assignee: Billy R. Willis
• Inventors: Willis, Billy R.
• Primary Examiner(s): Orsino, Joseph A.
• Assistant Examiner(s): Mullen, Jr., Thomas J.
• Application Number:
  US07/285,777
• Time in Patent Office: 578 Days
• Field of Search: 340/566, 340/429, 340/669, 340/690, 340/689, 340/323 R, 273/121 A, 73/654, 73/652, 33/366, 200/61.45 R, 200/61.48, 200/61.49, 200/61.51, 200/61.52, 379/40
• US Class Current: 340/566
• CPC Class Codes: G08B 29/046 prevention of tampering with detection circuits
• CPC Class Codes: H01H 35/144 operated by vibration

Abstract

An impact sensing and alarm system having a dual adjustment impact system and alarm circuit for activating selected alarm devices in conjunction with tamper switches connected to provide additional protection to critical areas of a machine. The impact sensor provides dual sensitivity with an adjustable conically tapered spring circumjacent an adjustable threaded contact. The spring is adjustable for coarse setting of the impact loading range and is then fixed. The threaded contact is adjustable to fine tune the threshold sensitivity. An alarm circuit is provided which is constructed to activate visible, audible or silent remote alarms. The impact alarm system is encapsulated to prevent access except to the adjustable threaded contact, and is simple and compact enough to be adaptable to protect any coin-operated or other electronic device.

Claims

1. An integrated alarm system for protecting electronic machines against tampering comprising;

an alarm circuit for activating one or more alarms;

mounting means mounting said alarm circuit in said electronic machine;

one or more alarm switches for activating said alarm circuit in response to tampering;

said one or more alarm switches for activating said alarm circuit including at least one impact sensing means for sensing impact to said electronic machine;

said impact sensing means including a deflectable spring having an integrally formed conically tapered portion and a cylindrical portion tightly wound to form threads;

said mounting means including a threaded hole for mounting said deflectible spring;

said cylindrical threaded portion of spring being adjustably threaded into said hole with said conically tapered portion circumjacent an adjustable electrical contact so that the position of said conically tapered portion relative to said electrical contact can be adjusted by threading said spring into or out of said threaded hole to adjust the sensitivity range of said impact sensing means;

said deflectable spring and electrical contact being connected to said alarm circuit so that a deflection of said conically tapered end of said spring that causes contact with said electrical contact causes activation of said alarm circuit.

2. The system according to claim 1 in which said deflectable spring is threadably mounted in a threaded hole in a first flange on said printed circuit board;

said electrical contact being a screw mounted in a threaded hole in a second flange on said printed circuit board opposite said first flange;

whereby the end of said threaded screw may be moved toward or away from said conically tapered end of said deflectable spring to adjust the threshold sensitivity of said impact sensing means.

3. The system according to claim 1 in which said one or more alarm switches includes at least two additional alarm switches mounted in said electronic machine to detect tampering with critical areas of said machine.

4. The system according to claim 3 in which one of said alarm switches is a priority alarm switch mounted to detect tampering with the most critical part of said machine.

5. The system according to claim 4 in which said priority alarm switch is mounted to detect tampering with a coinbox of a coin operated machine.

6. The system according to claim 5 in which said priority alarm switch is connected to said alarm circuit to activate an automatic telephone dialer to dial a preprogrammed telephone number and deliver a message.

7. The system according to claim 6 including means for activating said alarm after a first impact to said impact sensing means and delay activating said automatic dialer until after a predetermined number of impacts.

8. The system according to claim 7 in which said delay means includes a charging circuit;

said charging circuit being charged by continuous impacts that activate said impact sensing means;

said charging circuit when fully charged activating said automatic dialer connected to said alarm circuit.

9. The system according to claim 1 in which said alarm circuit includes means to stop said alarm after a predetermined period of time if no further impacts are received.

10. The system according to claim 9 in which said means to stop said alarm includes a timing circuit to set the on time of an alarm connected to said alarm circuit.

11. The system according to claim 10 in which said means to stop said alarm includes a charging circuit;

said charging circuit being charged by continuous impacts that activate said impact sensing means;

said charging circuit when fully charged continuously activating an alarm connected to said alarm circuit.

12. The system according to claim 11 in which said alarm circuit activates a visible alarm.

13. The system according to claim 11 in which said alarm circuit activates an audible alarm.

14. The system according to claim 1 including a reset switch for resetting said alarm circuit after activation.

15. The system according to claim 14 in which said reset switch is connected to an access door on said electronic machine;

whereby opening said access door to service said machine disables and resets said alarm circuit.

16. The system according to claim 1 including delay means for delaying the alarm until said impact sensing means has been activated a predetermined number of times.

17. The system according to claim 16 in which said delay means includes a charging circuit;

said charging circuit being charged by continuous impacts that activate said impact sensing means;

said charging circuit when fully charged activating an alarm connected to said alarm circuit.

18. The system according to claim 17 in which said alarm circuit is constructed to activate an automatic telephone dialer to dial a preprogrammed telephone number and deliver a message.