alarm

The alarm system addresses the difficulty in switching conventional alarms by incorporating a sliding housing mechanism that hides the operational state, enabling easy operation and enhanced security through concealed status indication.

JP7759155B1Active Publication Date: 2025-10-23ASAHI ELECTRIC CO LTD
View PDF 4 Cites 0 Cited by

Patent Information

Application Number
JP2025137104
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2025-08-20
Publication Date
2025-10-23
Estimated Expiration
2045-08-20

AI Technical Summary

Technical Problem

Conventional alarms are difficult to switch on and off, particularly for operators with limited dexterity, and their operational state can be easily discerned from the outside, compromising security.

Method used

An alarm system installed on a window with a vibration sensor and alarm unit, housed in a sliding housing that switches between on and off states by sliding relative to a mounting member, making the operational state hidden from view.

Benefits of technology

Facilitates easy on-off switching for users with limited dexterity and enhances security by concealing the operational state, deterring intruders and allowing for a simpler design without visible switches.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007759155000001_ABST
    Figure 0007759155000001_ABST
Patent Text Reader

Abstract

Make it easier to turn alarms on and off. [Solution] The present disclosure relates to an alarm 1 that is installed on a window glass W1 inside a room and includes a vibration sensor 16b that can detect vibrations and an alarm unit 17 that notifies that vibrations have been detected. The alarm 1 includes a mounting member 2 that is attached to the window glass W1 and a housing 7 that houses the vibration sensor 16b and the alarm unit 17, and the housing 7 slides relative to the mounting member 2 to switch between an on state and an off state.
Need to check novelty before this filing date? Find Prior Art

Description

[Technical Field]

[0001] The present invention relates to alarms. [Background technology]

[0002] Patent Document 1 discloses a home burglar alarm having a casing that is attached to the glass interior surface of a building. This alarm has a sensor built into the casing that detects the brightness of the room, and an LED lamp that starts flashing when the sensor detects that the room has become dark, and is configured so that it can be seen from outside. A switch is provided on the side of the casing, which can switch the operating states of the sensor, LED lamp, alarm buzzer, etc. on and off (paragraph 0009 of the specification). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-339162 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional alarms are switched on and off by operating a switch with a finger. However, depending on the operator, there may be cases where the operator has difficulty using their fingertips, and taking such cases into consideration, it cannot be said that conventional alarms are necessarily easy to switch on and off.

[0005] An object of the present disclosure is to make it easier to switch on and off. [Means for solving the problem]

[0006] A first aspect of the present disclosure is an alarm that is installed on a window inside a room and includes a vibration sensor that can detect vibrations and an alarm unit that notifies the user that vibrations have been detected, and the alarm also includes a mounting member that is attached to the window and a housing that houses at least one of the vibration sensor and the alarm unit, and the housing slides relative to the mounting member to switch between an on state and an off state.

[0007] A second aspect of the present disclosure is an alarm according to the first aspect, in which the housing is hidden by the mounting member when viewed from the mounting member side, making it impossible to determine whether the alarm is in an on state or an off state.

[0008] A third aspect of the present disclosure is an alarm that is installed on a window inside a room and includes a vibration sensor that can detect vibrations, an alarm unit that notifies that vibrations have been detected, and a circuit board for electrically connecting the vibration sensor and the alarm unit, and the alarm also includes a mounting member that is attached to the window, and a main body that includes at least the circuit board and is slidable relative to the mounting member, and the alarm can be switched between an on state and an off state by sliding the main body relative to the mounting member.

[0009] A fourth aspect of the present disclosure is an alarm according to the third aspect, in which the main body is hidden by the mounting member when viewed from the mounting member side, making it impossible to determine whether the alarm is in an on state or an off state. [Effects of the Invention]

[0010] In the present disclosure, the housing or main body can be slid relative to the mounting member to switch between the on state and the off state, making on-off switching easy. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a front view showing an off state of the alarm according to the embodiment. [Figure 2] FIG. 10 is a perspective view showing an alarm in an off state. [Figure 3] FIG. 10 is a front view showing the alarm in an on state. [Figure 4] FIG. 1 is a perspective view showing an alarm attached to a window pane. [Figure 5] FIG. [Figure 6] FIG. 2 is a schematic front view showing the inside of the main body. [Figure 7] FIG. 10 is a front view showing a mounting member according to a first modified example of the embodiment. [Figure 8] 8 is a perspective view showing a claw portion E of the fitting portion in FIG. 7. FIG. [Figure 9] FIG. 10 is a front view showing a rear case member according to a first modified example of the embodiment. [Figure 10] FIG. 10 is a view corresponding to FIG. 3 according to a second modified example of the embodiment. [Figure 11] FIG. 10 is a view corresponding to FIG. 2 according to a third modified example of the embodiment. [Figure 12] FIG. 10 is a view corresponding to FIG. 3 according to a third modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described.

[0013] (Embodiment) -alarm- An alarm 1 according to an embodiment of the present disclosure is installed on a window glass W1 of a house for security purposes. As shown in Figures 1 to 4, the alarm 1 comprises a mounting member 2 that is attached to the window glass W1, a main body 3 provided on the front side of the mounting member 2, and a magnet M. Hereinafter, when the alarm 1 is attached to the window glass W1, the "front side" refers to the indoor side, and the "back side" refers to the outdoor side (the window glass W1 side).

[0014] - Mounting parts - The mounting member 2 is formed as a thin, approximately rectangular plate that is long in the vertical direction when viewed from the front. There are no limitations on the dimensions of the mounting member 2, but it is preferable that the vertical length is 8 to 12 cm (for example, about 10 cm), the horizontal length is 2 to 5 cm (for example, about 3.5 cm), and the thickness is 0.5 to 1.5 mm (for example, about 1 mm). An adhesive portion is provided on the rear surface of the mounting member 2 so that it can be attached to the window glass W1. A warning such as "Security device activated" or "Alarm activated" may be displayed on the rear surface of the mounting member 2 to notify people outside the room that the alarm 1 has been installed.

[0015] As shown in Fig. 5, the front surface of the mounting member 2 is provided with fitting portions 4a-4d and protrusions 5a, 5b for slidably mounting the main body 3 to the mounting member 2. The fitting portions 4a-4d are provided on the periphery of the mounting member 2, two above and two below the center of the mounting member 2. Each of the fitting portions 4a-4d is provided with a claw portion E at its protruding tip (front side portion) for fitting into the main body 3. The protrusions 5a, 5b are provided side by side vertically near the center of the front surface of the mounting member 2, and each protrudes toward the front. Elongated holes 6a, 6b extending in the vertical direction are provided on both the left and right sides of the protrusions 5a, 5b, respectively.

[0016] -Main body- The main body 3 includes a rear case member 7a and a front case member 7b as the housing 7. The housing 7 is formed in a generally rectangular shape that is long in the vertical direction when viewed from the front. The dimensions of the housing 7 are not limited, but for example, the vertical length is slightly (about 5 to 10%) shorter than the mounting member 2, and the horizontal length is approximately the same as or slightly shorter than the mounting member 2. The rear case member 7a and the front case member 7b are integral with each other to form the housing 7.

[0017] As shown in Figures 5 and 6, the rear case member 7a has cutouts 8a to 8d formed on its periphery for fitting with the fitting portions 4a to 4d of the mounting member 2. The claws E of the fitting portions 4a to 4d hook onto the cutouts 8a to 8d of the rear case member 7a, respectively. This allows the fitting portions 4a to 4d to fit into the cutouts 8a to 8d, respectively. The vertical dimensions of the cutouts 8a to 8d are larger than the vertical dimensions of the fitting portions 4a to 4d.

[0018] The rear surface of the rear case member 7a is provided with a pair of protrusions (not shown) that fit into the elongated holes 6a and 6b.

[0019] The rear case member 7a has through-holes 9 and 10 that penetrate the thickness direction at approximately the center in the vertical direction and at a portion near the upper end. The through-hole 9 at approximately the center in the vertical direction includes guide portions 9a and 9b through which the protrusions 5a and 5b of the mounting member 2 are inserted and move in the vertical direction. Both guide portions 9a and 9b extend in the vertical direction. Between the guide portions 9a and 9b, a constricted portion 9c that is narrower than the diameter of the protrusion 5a is provided to prevent the main body unit 3 (housing 7) that has slid upward from naturally sliding downward due to gravity. The through-hole 10 provided at a portion near the upper end of the rear case member 7a includes a first portion 10a that is elongated in the vertical direction and whose lower and upper ends are formed in an arc shape in a front view, and second portions 10b and 10c that are formed at the lower left and lower right of the first portion 10a and have a substantially rectangular shape in a front view.

[0020] The main body 3 includes, inside the housing 7, a battery storage section 12 in which a battery 11 is stored, a positive terminal 13a, a negative terminal 13b, a connection section 14, a board 15 (circuit board), an open sensor 16a, a vibration sensor 16b, and an alarm section 17.

[0021] Battery accommodating section 12 is inserted into housing 7 from the bottom. Positive terminal 13a and negative terminal 13b are provided in battery accommodating section 12 and electrically connect battery 11 to substrate 15. Although not limited to this, battery 11 is preferably a coin battery, which is thin and easy to accommodate in housing 7.

[0022] The connection portion 14 is provided on the rear side of the substrate 15. The connection portion 14 is made of an electrically conductive material such as metal. The control circuit of the substrate 15 is configured to be energized when the connection portion 14 comes into contact with a predetermined portion. The connection portion 14 is provided with two holes 14a, 14b through which the protrusions 5a, 5b of the mounting member 2 pass. That is, the protrusions 5a, 5b pass through the through portion 9 of the rear case member 7a and the holes 14a, 14b of the connection portion. The control circuit of the substrate 15 electrically connects the battery 11, the opening sensor 16a, the vibration sensor 16b, the alarm unit 17, etc.

[0023] The opening sensor 16a is a sensor that detects when the window is open and is provided on the substrate 15. The specific form of the opening sensor 16a is not limited, but it is configured to detect when the magnet M has separated from the main body 3. As shown in FIG. 4, the magnet M is attached to the sash surrounding the right window glass W2, for example, and the mounting member 2 and the main body 3 are attached to the left window glass W1. As a result, when one of the window glasses W1, W2 is slid relative to the other, the main body 3 and the magnet M separate from each other, and the opening of the window is detected by the opening sensor 16a. In addition, a magnet position indicator 18 that indicates the appropriate contact position (approach position) of the magnet M may be provided on the front side of the front case member 7b.

[0024] Vibration sensor 16b is a sensor that detects vibrations of window glass W1. Vibration sensor 16b is formed in a circular shape when viewed from the front. Vibration sensor 16b is disposed in first portion 10a of penetration portion 10 of rear case member 7a. Vibration sensor 16b is configured to send a signal to a control circuit (board 15) when it detects vibrations of a specific frequency, although the specific form is not limited thereto.

[0025] When a signal indicating that vibration has been detected is sent from vibration sensor 16b via substrate 15, notification unit 17 sounds a buzzer to notify that vibration has been detected. Notification unit 17 is formed in a circular shape when viewed from the front. Notification unit 17 is disposed in front of vibration sensor 16b (the front side of the paper in FIG. 6) at a position overlapping with vibration sensor 16b.

[0026] As shown in FIGS. 1 to 3, the main body 3 is provided with a battery replacement lamp 19 that lights up when the remaining battery power is low.

[0027] -On-off switch- The housing 7 of the main body 3 is attached to the mounting member 2 by fitting the mating portions 4a-4d of the mounting member 2 into the notches 8a-8d of the rear case member 7a, fitting the convex portions (not shown) of the rear case member 7a into the elongated holes 6a and 6b of the mounting member 2, and inserting the protrusions 5a and 5b of the mounting member 2 into the guide portions 9a and 9b of the rear case member 7a. The elongated holes 6a and 6b, the notches 8a-8d, and the guide portions 9a and 9b are formed long in the vertical direction so that the convex portions, mating portions 4a-4d, and protrusions 5a and 5b can move up and down, respectively. Therefore, the housing 7 is configured to be slidable relative to the mounting member 2.

[0028] When the housing 7 is slid up and down, the battery accommodating section 12 and the circuit board 15 move up and down together with the housing 7. On the other hand, the connection section 14 is fixed in position relative to the mounting member 2 by being inserted into the protrusions 5a and 5b at the holes 14a and 14b, and therefore does not move even when the housing 7 is slid. The vibration sensor 16b is fixed in position relative to the mounting member 2 and does not move even when the housing 7 is slid. The notification section 17 may or may not move together with the housing 7 when the main body section 3 is slid.

[0029] The housing 7 can be slid vertically relative to the mounting member 2 to switch the alarm 1 between an on state and an off state. Specifically, as shown in FIGS. 3 and 4, when the bottom end of the housing 7 is aligned with the bottom end of the mounting member 2, the alarm 1 is in the on state. In this state, the connection portion 14 is in contact with the predetermined portion of the circuit board 15, and the control circuit is energized. That is, in the on state, the opening sensor 16a, the vibration sensor 16b, and the alarm unit 17 are supplied with power from the battery 11, and when the opening sensor 16a or the vibration sensor 16b detects vibration of the window panes W1 and W2 or the opening of a window, the alarm unit 17 sounds a buzzer. Note that the bottom end of the front side of the mounting member 2 displays the message "Alarmed," indicating that the alarm function is activated. In the on state, the message "Alarmed" can be seen from inside the room.

[0030] Alarm 1 enters its OFF state when housing 7 is slid upward from the state shown in FIGS. 3 and 4 until its upper end is aligned with the upper end of mounting member 2, as shown in FIGS. 1 and 2. In this state, connector 14 contacts a portion of circuit board 15 that is offset downward from the predetermined portion, and the control circuit is not energized. In other words, in the OFF state, power supply to opening sensor 16a, vibration sensor 16b, and alarm unit 17 is cut off, so vibration of window panes W1 and W2 and the opening of the window are not detected. The lower end of the front side of mounting member 2 displays the message "OFF," indicating that the alarm function is deactivated. In the OFF state, the message "OFF" can be seen from inside the room.

[0031] When the alarm 1 is viewed from the mounting member 2 side (rear side), the entire main body 3 including the housing 7 is hidden by the mounting member 2, making it impossible to recognize the vertical position of the main body 3. For this reason, when viewed from the rear side, it is impossible to tell whether the alarm 1 is in the on state or the off state.

[0032] -Action and effect- Conventional alarms require a certain degree of dexterity in order to operate a small switch with the fingers to switch between on and off. In contrast, in this embodiment, the on and off states can be switched by sliding the housing 7 relative to the mounting member 2, so that the on and off states can be easily switched by, for example, grasping both the left and right sides of the housing 7 and sliding the main body 3. In other words, the alarm 1 according to this embodiment can be easily switched on and off even by an operator who has difficulty using their fingers.

[0033] The alarm 1 according to this embodiment has the effect of informing a person (intruder) attempting to break in through a window that crime prevention measures have been taken, thereby deterring the intruder. However, even if the intruder is aware of the presence of the alarm 1, if the intruder recognizes that the alarm 1 is off when it is in the off state, the effect of deterring the intruder as described above may not be obtained.

[0034] Since the alarm 1 according to this embodiment cannot be distinguished as being on or off when viewed from the rear, an intruder cannot know from outside that the alarm 1 is off. Therefore, this embodiment has the effect of deterring intruders from breaking in through a window, further enhancing security.

[0035] Furthermore, the alarm 1 according to this embodiment does not require an on / off switch because it can be switched on and off by sliding the housing 7. If such a switch is not provided, a simpler design can be adopted.

[0036] (First Modification of the Embodiment) As a first modified example of the embodiment, the mounting member 2 and rear case member 7a may have a simple configuration as shown in Figures 7 to 9. Below, components having functions common to the above embodiment are given the same reference numerals as in the above embodiment, and the following mainly describes the configuration of this modified example that differs from the above embodiment (the same applies to the second and third modified examples described below).

[0037] In this modification, the front surface of the mounting member 2 is provided with mating portions 4a, 4b, a protrusion 20, and projections 5a, 5b for slidably mounting the housing 7 to the mounting member 2. As shown in FIG. 7, the mating portions 4a, 4b are provided below and above the center of the mounting member 2, respectively. The mating portions 4a, 4b are formed such that the horizontally elongated, approximately rectangular portions at the lower and upper sides of the mounting member 2 protrude approximately 1 mm toward the front (in other words, the plate thickness is increased approximately 1 mm toward the front). As shown in FIG. 8, the left and right ends of the mating portion 4b are provided with claw portions E, E that protrude to the left and right, respectively, at the protruding tip (front side portion). The protrusion 20 is formed such that the plate thickness of the circular portion at the center of the mounting member 2 is increased approximately 0.5 to 1 mm toward the front. The projections 5a, 5b are provided side by side on the surface of the protrusion 20, and each protrudes toward the front.

[0038] 9, the rear case member 7a is provided with holes 21a and 21b for fitting with the fitting portions 4a and 4b of the mounting member 2. The holes 21a and 21b are formed so as to penetrate the rear case member 7a in the thickness direction, and are formed in a substantially rectangular shape.

[0039] The left and right claws E, E of the fitting portions 4a, 4b of the mounting member 2 are caught in the left and right portions of the holes 21a, 21b in the rear case member 7a, respectively, so that the fitting portions 4a, 4b fit into the holes 21a, 21b. The holes 21a, 21b have larger vertical dimensions than the fitting portions 4a, 4b so that the fitting portions 4a, 4b can move vertically therein.

[0040] The thickness of rear case member 7a at both sides of holes 21a and 21b may be thinner than the thickness of other portions, which makes it easier for fitting portions 4a and 4b to slide up and down inside holes 21a and 21b.

[0041] The rear case member 7a is provided with a recess 22 into which the protrusion 20 of the mounting member 2 fits. The recess 22 has a generally elliptical shape that is long in the vertical direction and is thinned by about 1 mm on the front side of the rear case member 7a. The recess 22 has a horizontal dimension that is approximately the same as that of the protrusion 20 so that the protrusion 20 fits into it, and a vertical dimension that is larger than that of the protrusion 20 so that the protrusion 20 can move up and down inside the recess 22.

[0042] The recess 22 of the rear case member 7a is provided with a through-hole 9 that penetrates in the thickness direction. The through-hole 9 includes guide portions 9a and 9b through which the protrusions 5a and 5b of the mounting member 2 are inserted and move in the vertical direction. Both guide portions 9a and 9b extend in the vertical direction. The guide portion 9a is provided with a constricted portion 9c that is narrower in diameter than the protrusion 5a to prevent the main body 3, which has slid upward, from naturally sliding downward due to gravity.

[0043] On the front side of the rear case member 7a, a battery placement section 23 is provided below the hole 21a. The battery placement section 23 is configured so that the battery housing section 12 inserted from the bottom of the housing 7 fits into it.

[0044] The housing 7 is attached to the mounting member 2 so that it can slide up and down relative to the mounting member 2, with the mating portions 4a, 4b and the protrusion 20 of the mounting member 2 fitting into the holes 21a, 21b and the recess 22 of the rear case member 7a, respectively, and the protrusions 5a, 5b inserting into the guide portions 9a, 9b of the rear case member 7a, respectively.

[0045] (Second Modification of the Embodiment) Figure 10 shows an alarm 1 according to a second modification of the embodiment. This alarm 1 has a different shape from that of the previous embodiment. The dimensions of the mounting member 2 are not limited, but it is preferable that the vertical length is 5 to 10 cm (for example, about 7 cm), the horizontal length is 4 to 7 cm (for example, about 5.5 cm), and the thickness is 0.5 to 1.0 mm (for example, about 1 mm).

[0046] Such dimensions make it easier to operate, especially for operators with large hands. Also, the space inside the housing 7 of the main body 3 is larger than that of the previous embodiment, making it easier to improve functionality, for example by incorporating a larger capacity battery 11 to extend its life.

[0047] (Third Modification of the Embodiment) 11 and 12 show an alarm 1 according to a third modified example of the embodiment. The shape of this alarm 1 is not limited, but may be, for example, similar to that of the second modified example. In the third modified example, a pair of walls 24, 24 that cover the left and right ends of the housing 7 of the main body 3 are provided on the left and right ends of the front side of the mounting member 2. The size of the housing 7 of the main body 3 in the left-right direction is smaller than that of the mounting member 2 by the thickness of the walls 24, 24.

[0048] This alarm 1 turns off when the housing 7 is slid closer to the upper or lower end relative to the mounting member 2 (Figure 11), and turns on when the main body 3 is slid to an intermediate position in the vertical direction (Figure 12).

[0049] The upper and lower ends of the rear case member 7a of the main body 3 are provided with a lower frame portion 25a and an upper frame portion 25b, which protrude downward and upward, respectively. The insides of the lower frame portion 25a and the upper frame portion 25b are provided with windows 26a and 26b that penetrate through the thickness direction, respectively, and a display that indicates whether the device is in the off or on state can be seen from the front side through the windows 26a and 26b. For example, as shown in FIG. 12, the words "Alert" may be seen through the windows 26a and 26b in the on state. Alternatively, although not shown, the words "Disabled" may be seen through the windows 26a and 26b in the off state.

[0050] In this modified example, the mounting member 2 is provided with wall portions 24, 24, making the vertical position of the main body portion 3 even less visible from outside the room than in the previous embodiment, thereby further improving security.

[0051] (Other embodiments) The alarm 1 may be provided with a dummy lamp that can be seen from outside the room, giving the impression that the alarm is in operation even when the alarm is off.

[0052] The alarm 1 according to the embodiment is installed on the window glass W1 on the interior side, but it may be installed on a part of the window (for example, the sash) instead of the window glass W1.

[0053] The alarm 1 according to the above embodiment can be switched on and off by sliding the main body 3 including the housing 7 and other components up and down, but alternatively, it may be configured so that the on and off switching can be performed by, for example, sliding only the housing 7 up and down.

[0054] In the alarm 1 according to the embodiment, the housing 7 houses the battery storage section 12, the positive terminal 13a, the negative terminal 13b, the connection section 14, the circuit board 15, the open sensor 16a, the vibration sensor 16b, and the alarm section 17, but it is sufficient if the housing 7 houses at least one of the vibration sensor 16b and the alarm section 17.

[0055] In the alarm 1 according to the above embodiment, the housing 7 can be slid up and down, but the housing 7 is not essential. Even if the main body 3 does not include the housing 7, the alarm 1 may be configured so that at least a part of the main body 3 (for example, the base plate 15) can be moved up and down and the operator can grip and operate that part, thereby enabling the alarm 1 to be switched on and off.

[0056] In the alarm 1 according to the above embodiment, when viewed from the mounting member 2 side, the entire main body 3 including the housing 7 is hidden by the mounting member 2, but instead, the alarm 1 may be configured so that only the parts of the main body 3 and / or housing 7 that can slide up and down are hidden by the mounting member 2.

[0057] The alarm 1 according to the embodiment is configured such that the housing 7 slides up and down, but the main body 3 and / or the housing 7 may also be configured to slide left and right or diagonally. [Industrial Applicability]

[0058] The present invention is useful as a burglar alarm. [Explanation of symbols]

[0059] W1, W2 window glass 1 Alarm 2 Mounting parts 3 Main body 7. Housing 15 Circuit board 16b Vibration sensor 17. Information Department

Claims

1. An alarm that is installed on a window in a room and includes a vibration sensor that can detect vibrations and a notification unit that notifies the user that vibrations have been detected, a mounting member attached to the window; a housing that houses at least one of the vibration sensor and the notification unit, An alarm that can be switched between an on state and an off state by sliding the housing relative to the mounting member.

2. 2. The alarm of claim 1, An alarm in which the housing is hidden by the mounting member when viewed from the mounting member side, making it impossible to determine whether the alarm is in an on state or an off state.

3. An alarm is provided which is installed on a window in a room and comprises a vibration sensor capable of detecting vibrations, a notification unit which notifies the user that vibrations have been detected, and a circuit board for electrically connecting the vibration sensor and the notification unit, a mounting member attached to the window; a main body portion including at least the circuit board and slidably provided on the mounting member; An alarm that can be switched between an on state and an off state by sliding the main body relative to the mounting member.

4. 4. The alarm of claim 3, An alarm in which the main body is hidden by the mounting member when viewed from the mounting member side, making it impossible to determine whether the alarm is in an on state or an off state.

Citation Information

Patent Citations

  • Home crime prevention alarm

    JP2005339162A

  • Alarming lock plate of sliding door

    JP2008013981A

  • alarm device

    JP3087940U

  • Alarm system with thin profile

    US20050068176A1