WO2018004640A1 - Utility meter enclosure with tamper detection switch - Google Patents
Utility meter enclosure with tamper detection switch Download PDFInfo
- Publication number
- WO2018004640A1 WO2018004640A1 PCT/US2016/040617 US2016040617W WO2018004640A1 WO 2018004640 A1 WO2018004640 A1 WO 2018004640A1 US 2016040617 W US2016040617 W US 2016040617W WO 2018004640 A1 WO2018004640 A1 WO 2018004640A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- switch assembly
- tamper switch
- spring
- holder
- utility meter
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
- H01H3/161—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover or lid
Definitions
- the usage of resources such as gas, electricity and water are typically measured using meters.
- the utility meter enclosure typically includes a front cover secured to a base, as well as a tamper detection switch that detects attempts to access and/or tamper with the meter.
- the switch is in the form of a stainless steel strip that is press fit and soldered onto the printed circuit board assembly (PCBA) of the utility meter.
- PCBA printed circuit board assembly
- Variations in the material of the strip, the rolling direction when forming the strip, the direction in which the strip is cut from the blank, soldering temperature, handling conditions, etc. are all variables that affect the reliability of the switch.
- current strip designs are subject to shocks and vibrations that lead to false indications of tamper.
- a tamper detection switch assembly for detecting attempts to open/access a front cover of a utility meter enclosure.
- the switch assembly includes a lock, a spring, a metal contact, a holder for the metal contact, two metal strips, and a housing.
- the assembled switch is positioned relative to the utility meter enclosure and is soldered onto the PCBA of the utility meter. Any attempt to open the front cover causes the spring to move from a compressed to an expanded state and urge the metal contact into contact with the metal strips to establish a connection that indicates the front cover has been opened.
- Figure 1 is a perspective top view of a tamper detection switch assembly according to one example, shown in the open position.
- Figure 2 is another perspective top view of the tamper detection switch assembly of Figure 1, shown in the closed position.
- Figure 3 is an exploded view of the tamper detection switch assembly of Figure 1.
- Figure 4 is a top view illustrating the tamper detection switch assembly of Figure 1 mounted on a PCBA of a utility meter enclosure.
- Figure 5 is a partial section view of the tamper detection switch assembly of Figure 1 assembled with a utility meter enclosure.
- Figure 6 is another section view of the tamper detection switch assembly and utility meter enclosure of Figure 5.
- Figure 7 is a bottom perspective view of the lock of the tamper detection switch assembly of Figure 1.
- Figure 8 is a top perspective view of the lock of Figure 7.
- Figure 9 is a perspective view of the spring of the tamper detection switch assembly of Figure 1.
- Figure 10 is a bottom perspective view of the metal contact of the tamper detection switch assembly of Figure I .
- Figure 11 is a top perspective view of the holder of the tamper detection switch assembly of Figure 1.
- Figure 12 is a top perspective view of the metal contact of Figure 10 assembled with the holder of Figure 11.
- Figure 13 is a perspective view of one of the metal strips of the tamper detection switch assembly of Figure 1.
- Figure 14 is a top perspective view of the housing of the tamper detection switch assembly of Figure 1.
- Figure 15 is another partial perspective view of the housing of Figure 14.
- Figure 16 is a rear perspective view of the housi ng of Figure 14.
- a tamper detection switch assembly 10 for a utility meter enclosure made up of a front cover 12 and a base 14 (see Figure 5).
- Figures 1-2 illustrate an assembled view of the switch assembly 10 in the open position (Figure 1) and the closed position ( Figure 2), while Figure 3 shows an exploded view of the various components of the switch assembly 10.
- the switch assembly 10 includes a lock 20, a spring 30, a metal contact 40, a holder 50 for the metal contact 40, two metal strips 60, and a housing 70.
- lock 20, holder 50 and housing 70 are made of any suitable plastic, while metal contact 40 and the two metal strips 60 are made of tin-plated brass, although other suitable conductive metals may be used for metal contact 40 and metal strips 60.
- Lock 20 is shown in isolation in Figures 7-8.
- Lock 20 includes legs 22 configured to snap fit into cavities 72 of the housing 70, as described below.
- Lock 20 also includes a protrusion 28 with an aperture 26 extending therethrough.
- lock 20 has a planar top surface from which the legs 22 downwardly extend and from which two platforms 29 extend. Each of the two platforms 29 is configured to be received in cavities 74 of the housing 70 ( Figures 14-15).
- Spring 30 is illustrated in isolation in Figure 9 and has two closed ends 32, 34. End 32 is secured around protrusion 28 of the lock 20, while end 34 is secured around post 52 of the holder 50, Spring 30 is tensioned to move between a compressed state and an expanded state up to a distance X (see Figure 6).
- Metal contact 40 is shown in isolation in Figure 10 and includes two arms 42 and an aperture 44.
- the two amis 42 are configured to be received within apertures 54 of holder 50 (shown in isolation in Figure 1 1) while the post 52 of the holder 50 is inserted through aperture 44 of the contact metal 40, as illustrated in Figure 12.
- Each of the strips 60 has a soldering surface 62 at a first end of the strip and a contact surface 64 at a second end of the strip opposite the first end.
- Housing 70 is shown in isolation in Figures 14-16. As mentioned above, housing 70 includes cavities 72 shaped and sized to receive the legs 22 of the lock 20 and cavities 74 shaped and sized to receive the platforms 29 of the lock 20. Housing 70 also includes ledges 78 that are each shaped to support one of the soldering surfaces 62 of the strips 60. Housing 70 further includes bosses 76 for guiding the switch assembly 10 onto the PCBA 16. The bottom surface 77 of housing 70 includes an aperture 79, explained in more detail below.
- each of strips 60 is positioned within the housing 70 so that the soldering surfaces 62 rest on ledges 78 of the housing 70 (see Figures 14-15) and the contact surfaces 64 are located proximate the bottom surface 77 of the housing 70.
- the holder 50 with the contact 40 mounted thereon (see Figure 12) is also positioned within the housing 70.
- the spring 30 is secured at one end to the post 52 of the holder 50 and at the other end to the protrusion 28 of the lock 20 and the legs 22 of lock 20 are received within the cavities 72 of the housing 70 to snap fit the switch assembly 10 together.
- legs 22 are replaced with any other suitable locking feature.
- the planar top surface 24 of the lock 20 is generally flush with the soldering surfaces 62 of the strips 60, although this need not be the case.
- the assembled switch assembly 10 is soldered onto the printed circuit board assembly (PCBA) 16 inside the utility meter enclosure. Specifically, as shown in Figure 4, the strips 60 are soldered using surface-mount technology (SMT) at the soldering surfaces 62 to the PCBA 16. In this way, the planar top surface 24 of the lock 20 faces the PCBA 16.
- SMT surface-mount technology
- the front cover 12 and the base 14 are secured together around the PCBA 16 and the assembled switch assembly 10, as illustrated in Figures 5-6.
- the switch assembly 10 When the front cover 12 is closed, the switch assembly 10 is in the closed position, shown in Figure 2. In the closed position, the spring 30 is in its compressed state between the holder 50 and the lock 20 and the metal contact 40 is separated from the strips 60 so there is no connection between the metal contact 40 and the strips 60.
- a pin 18 of the front cover 12 when the front cover 12 is fixed with respect to the base 14, a pin 18 of the front cover 12 is received within the aperture 79 of the bottom surface 77 of the housing 70 and presses against the bottom surface of the holder 50.
- the pin 18 moves the holder 50 away from the bottom surface 77 of the housing 70 and compresses the spring 30 up to a distance X toward the planar top surface 24 of the lock 20. As its compresses, the spring 30 pushes the holder 50 (and in turn the metal contact 40 mounted on the holder 50) toward the planar top surface 24 of the lock 20 and out of contact with the strips 60.
- the post 52 may at least partially extend through aperture 26 of the protrusion 28 of the lock 20 as shown in Figure 2. In some cases, distance X is approximately 3.0 mm.
- pin 18 is an integral part of front cover 12. Pin 18 can be made of plastic or any other suitable material.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Push-Button Switches (AREA)
Abstract
A tamper detection switch for a utility meter enclosure. The tamper detection switch is configured to detect an attempt to open a front cover of the utility meter enclosure. The tamper detection switch includes a spring that moves from a compressed state to an expanded stated when the front cover is opened. In the expanded stated, the spring urges contact between two metal components of the switch to indicate opening of the front cover.
Description
Utility Meter Enclosure with Tamper Detection Switch
Related Fields
[0001] Tamper detection switches for utility meter enclosures.
Background
[0002] The usage of resources such as gas, electricity and water are typically measured using meters. The utility meter enclosure typically includes a front cover secured to a base, as well as a tamper detection switch that detects attempts to access and/or tamper with the meter. Typically, the switch is in the form of a stainless steel strip that is press fit and soldered onto the printed circuit board assembly (PCBA) of the utility meter. Variations in the material of the strip, the rolling direction when forming the strip, the direction in which the strip is cut from the blank, soldering temperature, handling conditions, etc. are all variables that affect the reliability of the switch. Moreover, current strip designs are subject to shocks and vibrations that lead to false indications of tamper.
Summary
[0003] The term embodiment and like terms are intended to refer broadly to all of the subject matter of this disclosure. Statements containing these terms should be understood not to limit the subject matter described herein. This summary is a high-level overview of various aspects of the disclosure and introduces some of the concepts that are further described in the Detailed Description section below. This summary is not intended to identify key or essential features, nor is it intended to be used in isolation.
[0004] Disclosed is a tamper detection switch assembly for detecting attempts to open/access a front cover of a utility meter enclosure. The switch assembly includes a lock, a spring, a metal contact, a holder for the metal contact, two metal strips, and a
housing. The assembled switch is positioned relative to the utility meter enclosure and is soldered onto the PCBA of the utility meter. Any attempt to open the front cover causes the spring to move from a compressed to an expanded state and urge the metal contact into contact with the metal strips to establish a connection that indicates the front cover has been opened.
Brief Description of the Drawings
[0005] The specification makes reference to the following appended figures, in which use of like reference numerals in different figures is intended to illustrate like or analogous components.
[0006] Figure 1 is a perspective top view of a tamper detection switch assembly according to one example, shown in the open position.
[0007] Figure 2 is another perspective top view of the tamper detection switch assembly of Figure 1, shown in the closed position.
[0008] Figure 3 is an exploded view of the tamper detection switch assembly of Figure 1.
[0009] Figure 4 is a top view illustrating the tamper detection switch assembly of Figure 1 mounted on a PCBA of a utility meter enclosure.
[0010] Figure 5 is a partial section view of the tamper detection switch assembly of Figure 1 assembled with a utility meter enclosure.
[001 1] Figure 6 is another section view of the tamper detection switch assembly and utility meter enclosure of Figure 5.
[0012] Figure 7 is a bottom perspective view of the lock of the tamper detection switch assembly of Figure 1.
[0013] Figure 8 is a top perspective view of the lock of Figure 7.
[0014] Figure 9 is a perspective view of the spring of the tamper detection switch assembly of Figure 1.
[0015] Figure 10 is a bottom perspective view of the metal contact of the tamper detection switch assembly of Figure I .
[0016] Figure 11 is a top perspective view of the holder of the tamper detection switch assembly of Figure 1.
[0017] Figure 12 is a top perspective view of the metal contact of Figure 10 assembled with the holder of Figure 11.
[0018] Figure 13 is a perspective view of one of the metal strips of the tamper detection switch assembly of Figure 1.
[0019] Figure 14 is a top perspective view of the housing of the tamper detection switch assembly of Figure 1.
[0020] Figure 15 is another partial perspective view of the housing of Figure 14.
[0021] Figure 16 is a rear perspective view of the housi ng of Figure 14.
Detailed Description
[0022] Disclosed is a tamper detection switch assembly 10 for a utility meter enclosure made up of a front cover 12 and a base 14 (see Figure 5). Figures 1-2 illustrate an assembled view of the switch assembly 10 in the open position (Figure 1) and the closed position (Figure 2), while Figure 3 shows an exploded view of the various components of the switch assembly 10. The switch assembly 10 includes a lock 20, a spring 30, a metal contact 40, a holder 50 for the metal contact 40, two metal strips 60, and a housing 70. In the non-limiting example described herein, lock 20, holder 50 and
housing 70 are made of any suitable plastic, while metal contact 40 and the two metal strips 60 are made of tin-plated brass, although other suitable conductive metals may be used for metal contact 40 and metal strips 60.
[0023] Lock 20 is shown in isolation in Figures 7-8. Lock 20 includes legs 22 configured to snap fit into cavities 72 of the housing 70, as described below. Lock 20 also includes a protrusion 28 with an aperture 26 extending therethrough. As seen in Figure 8, lock 20 has a planar top surface from which the legs 22 downwardly extend and from which two platforms 29 extend. Each of the two platforms 29 is configured to be received in cavities 74 of the housing 70 (Figures 14-15).
[0024] Spring 30 is illustrated in isolation in Figure 9 and has two closed ends 32, 34. End 32 is secured around protrusion 28 of the lock 20, while end 34 is secured around post 52 of the holder 50, Spring 30 is tensioned to move between a compressed state and an expanded state up to a distance X (see Figure 6).
[0025] Metal contact 40 is shown in isolation in Figure 10 and includes two arms 42 and an aperture 44. The two amis 42 are configured to be received within apertures 54 of holder 50 (shown in isolation in Figure 1 1) while the post 52 of the holder 50 is inserted through aperture 44 of the contact metal 40, as illustrated in Figure 12.
[0026] One of the two metal strips 60 is shown in isolation in Figure 13. Each of the strips 60 has a soldering surface 62 at a first end of the strip and a contact surface 64 at a second end of the strip opposite the first end.
[0027] Housing 70 is shown in isolation in Figures 14-16. As mentioned above, housing 70 includes cavities 72 shaped and sized to receive the legs 22 of the lock 20 and cavities 74 shaped and sized to receive the platforms 29 of the lock 20. Housing 70 also
includes ledges 78 that are each shaped to support one of the soldering surfaces 62 of the strips 60. Housing 70 further includes bosses 76 for guiding the switch assembly 10 onto the PCBA 16. The bottom surface 77 of housing 70 includes an aperture 79, explained in more detail below.
[0028] To assemble the switch assembly 10, each of strips 60 is positioned within the housing 70 so that the soldering surfaces 62 rest on ledges 78 of the housing 70 (see Figures 14-15) and the contact surfaces 64 are located proximate the bottom surface 77 of the housing 70. The holder 50 with the contact 40 mounted thereon (see Figure 12) is also positioned within the housing 70. The spring 30 is secured at one end to the post 52 of the holder 50 and at the other end to the protrusion 28 of the lock 20 and the legs 22 of lock 20 are received within the cavities 72 of the housing 70 to snap fit the switch assembly 10 together. n other examples, legs 22 are replaced with any other suitable locking feature. As shown in Figures 1-2, the planar top surface 24 of the lock 20 is generally flush with the soldering surfaces 62 of the strips 60, although this need not be the case.
[0029] The assembled switch assembly 10 is soldered onto the printed circuit board assembly (PCBA) 16 inside the utility meter enclosure. Specifically, as shown in Figure 4, the strips 60 are soldered using surface-mount technology (SMT) at the soldering surfaces 62 to the PCBA 16. In this way, the planar top surface 24 of the lock 20 faces the PCBA 16. The front cover 12 and the base 14 are secured together around the PCBA 16 and the assembled switch assembly 10, as illustrated in Figures 5-6.
[0030] When the front cover 12 is closed, the switch assembly 10 is in the closed position, shown in Figure 2. In the closed position, the spring 30 is in its compressed
state between the holder 50 and the lock 20 and the metal contact 40 is separated from the strips 60 so there is no connection between the metal contact 40 and the strips 60. In particular, as illustrated in Figure 6, when the front cover 12 is fixed with respect to the base 14, a pin 18 of the front cover 12 is received within the aperture 79 of the bottom surface 77 of the housing 70 and presses against the bottom surface of the holder 50. Since the planar top surface 24 of the lock 20 is fixed in position due to its proximity to PCBA 16, the pin 18 moves the holder 50 away from the bottom surface 77 of the housing 70 and compresses the spring 30 up to a distance X toward the planar top surface 24 of the lock 20. As its compresses, the spring 30 pushes the holder 50 (and in turn the metal contact 40 mounted on the holder 50) toward the planar top surface 24 of the lock 20 and out of contact with the strips 60. In the closed position, the post 52 may at least partially extend through aperture 26 of the protrusion 28 of the lock 20 as shown in Figure 2. In some cases, distance X is approximately 3.0 mm. In some cases, pin 18 is an integral part of front cover 12. Pin 18 can be made of plastic or any other suitable material.
[0031] When the front cover is separated from the base 14, the pin 18 no longer contacts the holder 50 to urge the holder 50 toward the planar top surface 24, which releases the spring 30 and causes the spring 30 to move from its compressed state to its expanded state and the switch assembly 10 to move into the open position. The spring 30 moving to its expanded state urges the holder 50 (and in turn the metal contact 40 mounted therein) back toward the bottom surface 77 of the housing 70 until the arms 42 of the metal contact 40 contact the contact surfaces 64 of the strips 60. Once the metal contact 40 makes contact with the strips 60, a connection is established that can be
detected by the utility meter. This connection can then be communicated via a display (such as an LCD display) or in any other suitable manner to indicate the utility meter enclosure has been accessed/opened/tampered with.
[0032] Numerous modifications of this invention may be made in the composition, application, manufacturing process and other aspects of this invention without departing from the objectives and spirit of the description above and in the Figures.
Claims
1. A tamper switch assembly configured to move between an open position and a closed position, the tamper switch assembly comprising:
a lock comprising a planar top surface, two legs that extend from the planar surface, and a protrusion that extends from the planar surface;
a spring with a first end and a second end, wherein the first end is secured with the protrusion of the lock;
a metal contact mounted on a holder, wherein the second end of the spring is secured with a post of the holder;
two metal strips, each of the metal strips comprising a soldering surface and a contact surface opposite the soldering surface; and
a housing comprising two cavities that are each configured to receive one of the two l egs of the lock and further comprising a bottom surface with an aperture, wherei n the soldering surfaces of the two metal strips are proximate an upper portion of the housing and the contact surfaces of the two metal strips are proximate the bottom surface of the housing,
wherein:
when the tamper switch assembly is in the closed position, the spring is in a compressed state and the holder and the metal contact are spaced apart from the contact surfaces of the two metal strips; and
when the tamper switch assembly is in the open position, the spring is in an expanded state and the holder and at least a portion of the metal contact contacts the
contact surfaces of the two metal strips to establish an electrical connection between the metal contact and the two metal strips.
2. The tamper switch assembly of claim 1, wherein the upper portion of the housing comprises two ledges and wherein each of the soldering surfaces of the two metal strips is positioned on a ledge of the two ledges.
3. The tamper switch assembly of claim 1 , wherein the housing further comprises at least one boss.
4. The tamper swi tch assembly of claim 1, wherein the protrusion of the lock defines an aperture extending at least partially therethrough.
5. The tamper switch assembly of claim 4, wherein the post of the holder is at least partially received in the aperture of the protrusion of the lock when the tamper switch assembly is in the closed position.
6. The tamper switch assembly of claim 1, wherein the soldering surfaces of the two metal strips are soldered on a printed circuit board assembly.
7. The tamper switch assembly of claim 1, wherein the metal contact comprises two arms.
8. The tamper switch assembly of claim 1, wherein the metal contact comprises an aperture that receives the post of the holder.
9. The tamper switch assembly of claim 1, wherein the tamper switch assembly is assembled with a utility meter enclosure, the utility meter enclosure comprising a front cover and a base and wherein, when the front cover is fixed with respect to the base: a pin of the front cover is received in the aperture of the bottom surface of the housing, and
the pin urges the spring into its compressed state.
10. The tamper switch assembly of claim 9, wherein, when the front cover is separated from the base, the spring moves from its compressed state into its expanded state.
1 1. The tamper switch assembly of claim 1, wherein the metal contact and the two metal strips are formed of tin-plated brass.
12. A utility meter enclosure comprising:
(a) a front cover comprising a pin;
(b) a base securable to the front cover;
(c) a printed circuit board assembly; and
(d) a tamper switch assembly movable between a closed position and an open position, the tamper switch assembly comprising:
(1) a lock;
(2) a spring;
(3) a metal contact;
(4) a holder that receives the metal contact;
(5) at least one metal strip; and
(6) a housing comprising a bottom surface defining an aperture, wherein:
the spring is positioned between the holder and the lock and is movable between an expanded state and a compressed state;
at least a portion of the at least one metal strip is soldered onto the printed circuit board assembly;
when the front cover is secured to the base, the tamper switch assembly is in the closed position and the pin of the front cover is inserted through the aperture of the bottom surface of the housing to abut the holder and retain the spring in its compressed state and wherein, when the spring is in its compressed state, the metal contact is separated from the at least one metal strip and the connection is broken,
when the front cover is separated from the base, the pin is separated from the holder and the tamper switch assembly moves into the open position and the spring moves to its expanded state, wherein, when the spring is in its expanded state, a connection is established between the metal contact and the at least one metal strip that indicates the utility meter enclosure has been opened.
13. The utility meter assembly of claim 12, wherein the lock further comprises a locking feature that secures the lock with the housing.
14. The utility meter assembly of claim 13, wherein the locking feature comprises two legs.
15. The utility meter assembly of claim 12, wherein the housing comprises at least one boss that guides positioning of the tamper switch assembly relative to at least one of the front cover , the printed circuit board assembly and the base.
16. The utility meter enclosure of claim 12, wherein arms of the metal contact are received in apertures of the holder.
17. The utility meter enclosure of claim 12, wherein the at least one metal strip comprises two metal strips.
18. The utility meter enclosure of claim 12, wherein the metal contact and the at least one metal strip are formed of tin-plated brass.
19. The utility meter enclosure of claim 12, wherein the spring moves approximately 3.0 mm between its expanded state and its compressed state.
20. The utility meter enclosure of claim 12, wherein a top surface of the lock defines an aperture that at least partially receives a post of the holder when the tamper switch assembly is in the closed position.
21. The utility meter enclosure of claim 12, wherein a first end of the spring is secured to a protrusion of the lock and a second end of the spring is secured to a post of the holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2016/040617 WO2018004640A1 (en) | 2016-07-01 | 2016-07-01 | Utility meter enclosure with tamper detection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2016/040617 WO2018004640A1 (en) | 2016-07-01 | 2016-07-01 | Utility meter enclosure with tamper detection switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018004640A1 true WO2018004640A1 (en) | 2018-01-04 |
Family
ID=60787552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2016/040617 WO2018004640A1 (en) | 2016-07-01 | 2016-07-01 | Utility meter enclosure with tamper detection switch |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2018004640A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3426316A (en) * | 1966-02-15 | 1969-02-04 | Honeywell Inc | Electric lead terminal |
| US4150371A (en) * | 1978-03-09 | 1979-04-17 | Ripley Company, Inc. | Tamper indicator |
| US20060197662A1 (en) * | 2005-02-24 | 2006-09-07 | Castle Scott T | Tamper switch arrangement |
| US7167092B2 (en) * | 2003-01-30 | 2007-01-23 | Matsushita Electric Industrial Co., Ltd. | Abnormality detector and information apparatus using the same |
| CN2881920Y (en) * | 2005-11-15 | 2007-03-21 | 吴福喜 | Switch of normally off at natural state |
| US20140268559A1 (en) * | 2013-03-13 | 2014-09-18 | Michael J. Vega | Pcb mounted cover activated intrusion detection switch |
| US20150061901A1 (en) * | 2013-08-29 | 2015-03-05 | Mark A. Casparian | Systems And Methods For Lighting Spring Loaded Mechanical Key Switches |
-
2016
- 2016-07-01 WO PCT/US2016/040617 patent/WO2018004640A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3426316A (en) * | 1966-02-15 | 1969-02-04 | Honeywell Inc | Electric lead terminal |
| US4150371A (en) * | 1978-03-09 | 1979-04-17 | Ripley Company, Inc. | Tamper indicator |
| US7167092B2 (en) * | 2003-01-30 | 2007-01-23 | Matsushita Electric Industrial Co., Ltd. | Abnormality detector and information apparatus using the same |
| US20060197662A1 (en) * | 2005-02-24 | 2006-09-07 | Castle Scott T | Tamper switch arrangement |
| CN2881920Y (en) * | 2005-11-15 | 2007-03-21 | 吴福喜 | Switch of normally off at natural state |
| US20140268559A1 (en) * | 2013-03-13 | 2014-09-18 | Michael J. Vega | Pcb mounted cover activated intrusion detection switch |
| US20150061901A1 (en) * | 2013-08-29 | 2015-03-05 | Mark A. Casparian | Systems And Methods For Lighting Spring Loaded Mechanical Key Switches |
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