Anti-theft alarm device

Abstract

The utility model relates to an anti-theft alarm device which comprises a power supply, an audible and visual alarm, a switch and a wire, the power supply, the audible and visual alarm and the switch are electrically connected through the wire, the switch comprises a fixed outer cylinder with an upward opening and a movable inner cylinder, and the movable inner cylinder is arranged in the fixed outer cylinder in a sliding mode. A first reset mechanism used for pushing the movable inner cylinder upwards is arranged in the fixed outer cylinder, the movable inner cylinder is provided with a ball, a guide rod, a movable contact piece, a static contact ring piece and a fixed ring, the fixed ring is fixedly connected to the middle of the movable inner cylinder, the static contact ring piece is fixed to the lower side of the fixed ring, and the guide rod is slidably matched in the movable inner cylinder. The lower end of the guide rod penetrates through the fixing ring and the static contact ring piece and is fixedly connected with the movable contact piece, the upper end of the guide rod abuts against the lower end of the ball, and a second reset mechanism used for pushing the movable contact piece upwards is arranged in the movable inner cylinder. And the reliability of the alarm system is high.

Description

Technical Field

[0001] The utility model relates to an alarm, in particular to an anti-theft alarm device. Background Art

[0002] On some doors with high anti-theft requirements, an anti-theft alarm device is installed, which sounds an alarm when the door is opened. For example, a patent publication (publication) number CN201000658Y discloses an anti-theft alarm device, which includes a power supply, a doorbell, a switch, and a wire connecting the power supply, the doorbell, and the switch. At least one switch is composed of two separate static contact pieces and a moving contact piece. The two static contact pieces are respectively fixed on the inner wall of an insulating sleeve. The moving contact piece is placed at the corresponding position of the static contact piece against a spring. A guide rod (a The end of the guide rod passes through the gap between the two static contact pieces and abuts against the upper plane of the dynamic contact piece, and the other end of the guide rod abuts against a round ball that controls its axial movement. During installation, the sleeve can be vertically embedded in the top hole of the door body. After closing the door, the round ball shrinks under the pressure of the top wall of the door frame, causing the guide rod to move downward and compress the spring, so that the dynamic contact piece is separated from the static contact piece, and the circuit is in an open circuit state. After opening the door, in the absence of the pressure force of the top wall of the door frame, the restoring force of the spring causes the dynamic contact piece and the round ball of the guide rod to move upward, causing the dynamic and static contact pieces to close, the circuit to be turned on, and the electric bell to ring, which plays an alarm and anti-theft role.

[0003] Since the triggering mechanism of the switch relies on the direct compression of the ball by the top wall of the door frame, if the gap between the door frame and the door body changes due to weather changes (such as material expansion or contraction caused by humidity and temperature) or long-term use, it may affect the normal compression of the ball and thus affect the reliability of the alarm system. Utility Model Content

[0004] The utility model provides an anti-theft alarm device, which solves the above problems existing in the use process of the prior art.

[0005] The technical solution of the utility model is achieved as follows: an anti-theft alarm device comprises a power supply, an audible and visual alarm, a switch and a wire, wherein the power supply, the audible and visual alarm and the switch are electrically connected through the wire, the switch comprises a fixed outer cylinder and a movable inner cylinder with an opening facing upward, the movable inner cylinder is slidably arranged in the fixed outer cylinder, a first reset mechanism for pushing the movable inner cylinder upward is arranged in the fixed outer cylinder, the movable inner cylinder is provided with a round ball, a guide rod, a movable contact piece, a static contact ring piece and a fixed ring, the fixed ring is fixedly connected to the middle position of the movable inner cylinder, the static contact ring piece is fixed to the lower side of the fixed ring, the guide rod is slidably fitted in the movable inner cylinder, the lower end of the guide rod passes through the fixed ring and the static contact ring piece and is fixedly connected to the movable contact piece, the upper end of the guide rod abuts against the lower end of the round ball, and a second reset mechanism for pushing the movable contact piece upward is arranged in the movable inner cylinder.

[0006] Preferably, the upper end of the movable inner cylinder extends to the upper end opening of the fixed outer cylinder and is integrally formed with a cone.

[0007] Preferably, the first reset mechanism is a first spring, the second reset mechanism is a second spring, and the first spring has a higher stiffness coefficient than the second spring.

[0008] Preferably, the movable inner cylinder is provided with a limiting ring at the opening position of the upper end thereof, and the inner diameter of the limiting ring is smaller than the diameter of the ball.

[0009] Preferably, a limit block is provided on the outer side wall of the movable inner cylinder, a slideway is provided on the inner side wall of the fixed outer cylinder, and the limit block is slidably arranged on the slideway.

[0010] Preferably, the upper end of the guide rod is provided with a concave panel for contacting with the ball.

[0011] Preferably, a human infrared sensor is also connected to the wire.

[0012] In summary, the beneficial effects of the present invention are:

[0013] 1. The switch of the utility model comprises a fixed outer cylinder and a movable inner cylinder, the fixed outer cylinder can be fixed on the door body, and the movable inner cylinder is slidably arranged in the fixed outer cylinder. When closing the door, the door frame will first press and hold the entire movable inner cylinder to move downward, and when the ball reaches the door frame position, the door frame will press and hold the ball to retract downward, so that the guide rod drives the movable contact piece to move downward, and the movable contact piece is separated from the static contact ring piece, so that the circuit is in an open circuit state. After opening the door, the first reset mechanism pushes the movable inner cylinder to move upward as a whole, and the second reset mechanism pushes the static contact ring piece, the guide rod and the ball upward, the static contact ring piece and the movable contact piece are closed, the circuit is turned on, and the sound and light alarm emits sound and light, which plays the role of alarm and anti-theft. The structural arrangement of the fixed outer cylinder and the movable inner cylinder can make the ball be compressed normally when the gap between the door frame and the door body changes to a certain extent, and the reliability of the alarm system is high.

[0014] 2. The conical structure at the upper end of the movable inner tube facilitates the movable inner tube to be pressed down by the door frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1This is a schematic diagram of the structure of the utility model installed on the door body and matched with the door frame;

[0017] Figure 2 for Figure 1 Schematic diagram of the structure on the other side after removing the door;

[0018] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of ;

[0019] Figure 4 for Figure 3 An enlarged schematic diagram of the local structure of the upper switch part.

[0020] In the figure: 1. sound and light alarm; 2. switch; 3. fixed outer cylinder; 31. slide; 4. movable inner cylinder; 41. cone; 42. limit ring; 43. limit block; 51. round ball; 52. guide rod; 53. moving contact piece; 54. static contact ring piece; 55. fixing ring; 56. first spring; 57. second spring; 58. concave panel; 6. human infrared sensor; 7. door body; 71. fixing groove; 72. receiving groove; 8. door frame. DETAILED DESCRIPTION

[0021] The following will be combined with the attached embodiment of the present utility model Figure 1-4 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example:

[0023] like Figures 1 to 4As shown, the utility model discloses an anti-theft alarm device, including a power supply, an audible and visual alarm 1, a switch 2 and a wire, wherein the power supply, the audible and visual alarm 1 and the switch 2 are electrically connected through the wire, the power supply and the wire are not shown in the figure, the power supply can be an external power supply or a battery, which belongs to the prior art, and it is also common knowledge in the art to use a wire for electrical connection, wherein the switch 2 includes a fixed outer cylinder 3 and a movable inner cylinder 4 with an opening facing upward, the movable inner cylinder 4 is slidably arranged in the fixed outer cylinder 3, a first spring 56 for pushing the movable inner cylinder 4 upward is arranged in the fixed outer cylinder 3, and a round ball 51, a guide rod 52, a moving contact piece 53, a stationary contact ring piece 54 and a fixed ring 55 are arranged in the movable inner cylinder 4, and the wire connection between the wire and the switch 2 is specifically connected to the moving contact piece 53 and the stationary contact ring in the switch 2 The sheet 54 is electrically connected. Since the functions to be achieved by the circuit connection of the power supply, the sound and light alarm 1, the switch 2 and the wires are supported by a large number of mature technologies, the essence of the utility model is to optimize the combination of existing hardware and its connection method for specific applications, and does not involve improvements to the circuit, because the wires are not shown, and the circuit part is no longer described in detail. In the utility model, the fixed ring 55 is fixedly connected to the middle position of the movable inner cylinder 4, and the static contact ring sheet 54 is fixed on the lower side of the fixed ring 55, the guide rod 52 is slidably fitted in the movable inner cylinder 4, the lower end of the guide rod 52 passes through the fixed ring 55 and the static contact ring sheet 54 and is fixedly connected to the moving contact sheet 53, the upper end of the guide rod 52 abuts against the lower end of the ball 51, and a second spring 57 for pushing the moving contact sheet 53 upward is provided in the movable inner cylinder 4.

[0024] Furthermore, the upper end of the movable inner cylinder 4 passes through the opening at the upper end of the fixed outer cylinder 3 and is integrally formed with a cone 41 .

[0025] In addition, the first spring 56 has a higher spring constant than the second spring 57 .

[0026] When the utility model is installed on the upper side of the door body 7, Figure 3 and Figure 4As shown, the upper side of the door body 7 is provided with a fixing groove 71 for fixing the fixed outer cylinder 3 therein, and a receiving groove 72 for receiving the cone 41. When closing the door, the door frame 8 will first contact the cone 41, and then press the cone 41 and the entire movable inner cylinder 4 to move downward, the cone 41 enters the receiving groove 72, and the movable inner cylinder 4 retracts into the fixed outer cylinder 3. When the ball 51 reaches the door frame position, the door frame will press the ball 51 downward to retract. Because the first spring 56 has a higher stiffness coefficient than the second spring 57, even if the cone 41 is not pressed to the bottom, the ball 51 will be pressed downward and retracted downward after contacting the door frame, so that the guide rod 52 The movable contact piece 53 is driven to move downward, and the movable contact piece 53 is separated from the static contact ring piece 54, so that the circuit is in an open circuit state. After the door is opened, the first spring 56 pushes the movable inner cylinder 4 to move upward as a whole, and the second spring 57 pushes the static contact ring piece 54, the guide rod 52 and the round ball 51 upward, the static contact ring piece 54 and the movable contact piece 53 are closed, the circuit is turned on, and the sound and light alarm 1 emits sound and light to play an alarm and anti-theft role. Because the movable inner cylinder 4 is floating, when the gap between the door frame and the door body 7 changes to a certain extent, the round ball 51 of the utility model can also be compressed normally, and the round ball 51 will not be pressed by the door frame due to the excessive gap between the door frame and the door body 7.

[0027] In addition, in order to prevent the ball 51 from escaping from the movable inner cylinder 4, a limiting ring 42 is provided at the upper opening of the movable inner cylinder 4. The inner diameter of the limiting ring 42 is smaller than the diameter of the ball 51, so that only the upper half of the ball 51 can be exposed.

[0028] Next, a limit block 43 is provided on the outer wall of the movable inner cylinder 4, and a slideway 31 is opened on the inner wall of the fixed outer cylinder 3. The limit block 43 is slidably set on the slideway 31. This structure is used to limit the range of movement of the movable inner cylinder 4 and prevent the movable inner cylinder 4 from being pushed too upward by the first spring 56.

[0029] In addition, a concave panel 58 for contacting the ball 51 is provided at the upper end of the guide rod 52. The provision of the concave panel 58 can keep the ball 51 stable.

[0030] In the utility model, a human infrared sensor 6 is also connected to the wire, and the human infrared sensor 6 is installed on the outward side of the door body 7. If the door body 7 moves slightly due to strong wind, earthquake or other non-invasion reasons, it may cause unnecessary alarms and reduce the accuracy of the system. Therefore, the human infrared sensor 6 is added to double confirm whether there is actually an intrusion, thereby improving the alarm accuracy. The human infrared sensor 6 is an existing device and has been used in monitoring alarm systems, so it will not be described in detail.

[0031] It should also be pointed out that the terms used in the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-theft alarm device, comprising a power supply, an audible and visual alarm, a switch and a wire, wherein the power supply, the audible and visual alarm and the switch are electrically connected via the wire, and characterized in that: The switch includes a fixed outer cylinder and a movable inner cylinder with an opening facing upward, the movable inner cylinder is slidably arranged in the fixed outer cylinder, a first reset mechanism for pushing the movable inner cylinder upward is arranged in the fixed outer cylinder, the movable inner cylinder is provided with a round ball, a guide rod, a movable contact piece, a static contact ring piece and a fixed ring, the fixed ring is fixedly connected to the middle position of the movable inner cylinder, the static contact ring piece is fixed to the lower side of the fixed ring, the guide rod is slidably fitted in the movable inner cylinder, the lower end of the guide rod passes through the fixed ring and the static contact ring piece and is fixedly connected to the movable contact piece, the upper end of the guide rod abuts against the lower end of the round ball, and a second reset mechanism for pushing the movable contact piece upward is arranged in the movable inner cylinder.

2. The anti-theft alarm device according to claim 1, characterized in that: The upper end of the movable inner cylinder passes through the opening of the upper end of the fixed outer cylinder and is integrally formed with a cone.

3. The anti-theft alarm device according to claim 1, characterized in that: The first reset mechanism is a first spring, the second reset mechanism is a second spring, and the first spring has a higher stiffness coefficient than the second spring.

4. The anti-theft alarm device according to claim 1, characterized in that: The movable inner cylinder is provided with a limiting ring at the upper opening position thereof, and the inner diameter of the limiting ring is smaller than the diameter of the ball.

5. The anti-theft alarm device according to claim 1, characterized in that: A limiting block is arranged on the outer side wall of the movable inner cylinder, a slideway is provided on the inner side wall of the fixed outer cylinder, and the limiting block is slidably arranged on the slideway.

6. The anti-theft alarm device according to claim 1, characterized in that: The upper end of the guide rod is provided with a concave panel for contacting with the ball.

7. The anti-theft alarm device according to claim 1, characterized in that: The wire is also connected with a human infrared sensor.

Images