Tamper switch arrangement

• US 7,292,145 B2
• Filed: 02/24/2005
• Issued: 11/06/2007
• Est. Priority Date: 02/24/2005
• Status: Active Grant

• Current Assignee: Robert Bosch Corporation (Robert Bosch GmbH), Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Castle, Scott T, DeLozier, Paul F, Markese, Ronald J Jr.
• Primary Examiner(s): Lee; Benjamin C.
• Assistant Examiner(s): Mehmood; Jennifer
• Application Number:
  US11/065,191
• Publication Number:
  US 20060197662A1
• Time in Patent Office: 985 Days
• Field of Search: 340/545.6, 700 11- 13, 200/61.93
• US Class Current: 340/545.6
• CPC Class Codes: G08B 29/046 prevention of tampering with detection circuits

Abstract

A tamper switch arrangement detects tampering with a device, and includes a tamper switch assembly having a tamper switch with a first part and a second part. The first and second parts are movable relative to each other between an open switch position and a closed switch position. The tamper switch is biased into one of the open and closed switch positions. An enclosure substantially encloses the tamper switch assembly and the device. The enclosure includes a door and an opening disposed opposite the door. The enclosure is sized such that the tamper switch assembly may be compressed between an inner surface of the door and a second surface via the opening to thereby overcome the bias and actuate the tamper switch into an other of the open and closed switch positions.

Claims

1. A tamper switch arrangement for detecting tampering with a device, said apparatus comprising:

a tamper switch assembly including a tamper switch having a first part and a second part, said first and second parts being movable relative to each other between an open switch position and a closed switch position, said tamper switch being biased into one of the open and closed switch positions;

an enclosure configured to substantially enclose said tamper switch assembly and the device, said enclosure including a door and an opening disposed opposite said door, said enclosure being sized such that said tamper switch assembly may be compressed between an inner surface of said door and a second surface via said opening to thereby overcome the bias and actuate said tamper switch into an other of the open and closed switch positions; and

a rail attached to a second inner surface of said enclosure, said tamper switch assembly being slidable on said rail in directions generally aligned with said door and said opening.

2. The apparatus of claim 1 wherein said tamper switch is biased back into said one of the open and closed switch positions when at least one of:

said door is opened; and

said enclosure is moved away from the second surface.

3. The apparatus of claim 1 wherein said first and second parts are slidable relative to each other.

4. The apparatus of claim 1 wherein said opening comprises a throughhole.

5. The apparatus of claim 1 wherein said enclosure is sized such that said door may be closed to thereby compress said tamper switch assembly between said inner surface of said door and the second surface to thereby overcome the bias and actuate said tamper switch into the other of the open and closed switch positions.

6. The apparatus of claim 1 further comprising a plug configured to be attached to a fixed structure, said plug including the second surface, the second surface extending into said enclosure through said opening.

7. The apparatus of claim 1 wherein said opening is configured such that the second surface may extend into said enclosure through said opening.

8. The apparatus of claim 1 further comprising a spring disposed between said tamper switch and one of said opening and said door of said enclosure, said spring being configured to enable further compression of said tamper switch assembly after said tamper switch has been actuated into the other of the open and closed switch positions.

9. The apparatus of claim 1 further comprising an elongate device disposed between said tamper switch and one of said opening and said door of said enclosure, said elongate device having a length that is adjustable to set a level of compression of said tamper switch assembly.

10. A tamper detection assembly for placement within an enclosure, said assembly comprising:

a tamper switch including a first part and a second part, said first and second parts being movable relative to each other between an open switch position and a closed switch position, said tamper switch being biased into one of the open and closed switch positions, said tamper switch being configured to be compressed between an inner surface of a front door of the enclosure and a second surface via a rear opening of the enclosure such that the bias is overcome and said tamper switch is actuated into an other of the open and closed switch positions;

a spring configured to be operably coupled between said tamper switch and one of said opening and said door of said enclosure, said spring being configured to be compressed upon closing of the door after said tamper switch has been actuated into the other of the open and closed switch positions; and

an elongate device coupled to said tamper switch, said elongate device having a length that is adjustable to set a level of compression of said tamper detection assembly, the elongate device including a first elongate element and a second elongate element, the second elongate element being selectively couplable to the first elongate element at a plurality of points along a length of said first elongate element.

11. The assembly of claim 10 wherein said tamper switch is biased back into said one of the open and closed switch positions when at least one of:

said door is opened; and

said enclosure is moved away from the second surface.

12. The assembly of claim 10 wherein said first and second parts are slidable relative to each other.

13. The assembly of claim 10 wherein said opening comprises a throughhole.

14. The assembly of claim 10 wherein said spring is configured to be operably coupled between said tamper switch and the opening of the enclosure.

15. The assembly of claim 10 wherein the second surface comprises a surface of a fixed structure.

16. The assembly of claim 10 further comprising a plunger operably coupled to an end of said spring opposite said tamper switch.

17. A tamper detection assembly for placement within an enclosure, said assembly comprising:

a tamper switch including a first part and a second part, said first and second parts being movable relative to each other between an open switch position and a closed switch position, said tamper switch being biased into one of the open and closed switch positions, said tamper switch being configured to be compressed between an inner surface of a front door of the enclosure and a second surface via a rear opening of the enclosure such that the bias is overcome and said tamper switch is actuated into an other of the open and closed switch positions;

a spring configured to be operably coupled between said tamper switch and one of said opening and said door of said enclosure, said spring being configured to be compressed upon closing of the door after said tamper switch has been actuated into the other of the open and closed switch positions; and

a housing containing said tamper switch, said housing having a groove configured to receive a rail such that said assembly is slidable on said rail relative to the enclosure in directions generally aligned with said door and said opening.

18. The assembly of claim 17 further comprising an elongate device coupled to said tamper switch, said elongate device having a length that is adjustable to set a level of compression of said tamper detection assembly.

19. The assembly of claim 18 wherein said elongate device includes a first elongate element and a second elongate element, said second elongate element being selectively couplable to said first elongate element at a plurality of points along a length of said first elongate element.

28. The assembly of claim 17 further comprising a plunger operably coupled to an end of said spring opposite said tamper switch.

29. The assembly of claim 28 wherein a first end of the spring is operably coupled to the plunger, and a second end of said spring is operably coupled to a first portion of the tamper switch, and further comprising an elongate device coupled to a second portion of the tamper switch, said elongate device having a length that is adjustable to set a level of compression of the spring.

30. The assembly of claim 17 wherein said tamper switch is biased back into said one of the open and closed switch positions when at least one of:

said door is opened; and

said enclosure is moved away from the second surface.

20. A tamper detection assembly for placement within an enclosure, said assembly comprising:

a tamper switch including a first part and a second part, said first and second parts being movable relative to each other between an open switch position and a closed switch position, said tamper switch being biased into one of the open and closed switch positions;

a switch actuator operably coupled to said tamper switch and configured to actuate said tamper switch into an other of the open and closed switch positions in response to said tamper detection assembly being compressed between an inner surface of a front door of the enclosure and a second surface via a rear opening of the enclosure, the switch actuator comprising a plunger and a spring, a first end of said spring being coupled to said plunger, and a second end of said spring being coupled to a first portion of the tamper switch; and

an elongate device coupled to a second portion of the tamper switch, said elongate device having a length that is adjustable to set a level of compression of said tamper detection assembly.

21. The assembly of claim 20 wherein said tamper switch is biased back into said one of the open and closed switch positions when at least one of:

said door is opened; and

said enclosure is moved away from the second surface.

22. The assembly of claim 20 wherein said first and second parts are slidable relative to each other.

23. The assembly of claim 20 wherein said opening comprises a throughhole.

24. The assembly of claim 20 wherein said switch actuator is configured to be operably coupled between said tamper switch and the opening of the enclosure.

25. The assembly of claim 20 wherein the second surface comprises a surface of a fixed structure.

26. The assembly of claim 20 further comprising a housing containing said tamper switch, said housing having a groove configured to receive a rail such that said assembly is slidable on said rail relative to the enclosure in directions generally aligned with said door and said opening.

27. The assembly of claim 20 wherein said elongate device includes a first elongate element and a second elongate element, said second elongate element being selectively couplable to said first elongate element at a plurality of points along a length of said first elongate element.