Door opening and closing burglar alarm

Abstract

The utility model relates to a door opening and closing burglar alarm which comprises a shell with an opening in one end and a mounting plate covering the opening end of the shell. A PCB (Printed Circuit Board) is arranged in the shell; a switch is mounted on the PCB; a telescopic driving rod is arranged on the shell; the switch is driven to open and close through telescoping; the mounting plate is fixedly mounted on a show window and is used for connecting a double door or connecting a door and a door frame; when the mounting plate is mounted on the show window, the driving rod is compressed, and the switch is driven to be turned on. When the circuit is connected, the buzzer does not give an alarm; when the circuit is disconnected, the buzzer gives an alarm; when the burglar alarm is installed, the driving rod directly faces the show window and retracts into the shell, the driving switch is turned on, and the circuit is connected at the moment; when the burglar alarm is forcibly separated from the show window by external force, the driving rod extends out and is separated from the switch, the switch is closed, the circuit is disconnected, and the buzzer gives an alarm; therefore, the anti-theft performance of the show window is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-theft devices, in particular to a door-opening and -closing anti-theft device. Background Art

[0002] In shopping malls, some goods are placed in transparent display windows for display and sale. The opening and closing of the display windows are generally prevented from theft by installing mechanical door locks.

[0003] Mechanical door locks have the following disadvantages: 1. The lock body material is poor and the anti-violence performance is poor; 2. The key switch has poor safety; 3. It is highly replicable. The above reasons lead to poor protection of mechanical door locks, resulting in the goods in the display windows being easily stolen.

[0004] Therefore, how to improve the anti-theft performance of display windows has become an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] To solve the technical problems in the background art, the utility model discloses a door-opening and -closing anti-theft device.

[0006] The utility model provides a door-opening and -closing anti-theft device, which includes a housing with an open end and a mounting plate covering the open end of the housing;

[0007] A PCB board is installed in the housing;

[0008] A switch is installed on the PCB board;

[0009] A telescopic driving rod is arranged on the housing;

[0010] The switch is opened and closed by the telescopic driving rod;

[0011] The mounting plate is used for being fixedly installed on the display window, connecting double-leaf doors or connecting the door and the doorframe;

[0012] When the mounting plate is installed on the display window, the driving rod is compressed and the switch is driven to open.

[0013] A buzzer is installed in the housing. The PCB board is provided with a circuit connected to the inlet and outlet ends of the buzzer; the switch is installed on this circuit; when the circuit is connected, the buzzer does not give an alarm; when the circuit is disconnected, the buzzer gives an alarm; when the anti-theft device is installed, the driving rod faces the display window and retracts into the housing, driving the switch to open, and at this time the circuit is connected; when the anti-theft device is forcibly detached from the display window by an external force, the driving rod extends out, disengages from the switch, the switch closes, the circuit is disconnected, and the buzzer gives an alarm; thereby improving the anti-theft performance of the display window.

[0014] The specific installation structure of the driving rod is: a shoulder is provided; the housing is provided with a socket hole; the driving rod passes through the socket hole in the direction of the outside of the mounting plate, and its shoulder is clamped with the socket hole.

[0015] To improve the stability of the telescopic movement of the driving rod, a further design is as follows: the housing is provided with a guiding hole; the inner end of the driving rod is inserted into the guiding hole.

[0016] Directly setting the insertion hole on the housing will result in a complex housing structure and high cost. Based on this, a further improvement lies in: on the inner side of the open end of the housing and located on the mounting plate, a connecting plate is provided; the insertion hole is arranged on the connecting plate.

[0017] The length of the insertion hole directly affects the telescopic stability of the driving rod. Based on this, a further improvement lies in: on the connecting plate, a thickening block protruding outward is provided, and the insertion hole penetrates through the thickening block.

[0018] To improve the positional accuracy between the connecting plate and the housing, a further design is as follows: on the side of the connecting plate facing away from the mounting plate, a protruding snap ring is provided; on the inner side of the open end of the housing, a recessed snap table is provided for snap-connecting with the snap ring.

[0019] To facilitate the disassembly and assembly of the mounting plate and realize the recycling use of the present utility model, a further design is as follows: the connecting plate is provided with a slot whose end face is U-shaped and the distribution path is also U-shaped, and the mounting plate is inserted into the slot; on the mounting plate, a locking hole is provided; on the connecting plate, a fixing rod that can be adsorbed by a magnet is snap-connected; one end of the fixing rod is elastically connected to the housing through a first spring, and the other end is inserted into the locking hole.

[0020] In the case of using a magnet, the mounting plate can be easily removed, and the buzzer will not give an alarm. Based on this, a further improvement lies in: on the PCB board, a shrapnel is also connected; the shrapnel is provided with an elastic bowed portion, and the bowed portion is away from the PCB board when not under pressure; the bowed portion penetrates through the connecting plate and protrudes outward; when the mounting plate is snap-connected to the slot, the bowed portion is pressed, and the bowed portion is flush with the connecting plate and connected to the PCB board. The shrapnel is also installed in the circuit of the buzzer; when the bowed portion is connected to the PCB board and the switch is turned on at the same time, the circuit is connected; therefore, when the mounting plate is maliciously removed using a magnet, the bowed portion will bounce up and separate from the PCB board, causing the buzzer to give an alarm.

[0021] The specific structure of the shrapnel is as follows: it includes a body, and at both ends of the body, fixing plates extending perpendicularly in the same direction are provided, and are fixed on the PCB board by soldering; one end of the bowed portion is integrally formed and connected with the body; the bowed portion is arc-shaped, and the part protruding from the connecting plate is sub-arc-shaped.

[0022] To improve the contact stability between the bowed portion and the PCB board, a further design is as follows: at the other end of the bowed portion, a spherical convex block is provided, and the convex block faces the PCB board. Description of the Drawings

[0023] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0024] Figure 1 is the structural schematic diagram of the present utility model;

[0025] Figure 2 is the structural schematic diagram of the hidden mounting plate of the present utility model;

[0026] Figure 3 is the top view of the present utility model;

[0027] Figure 4 is Figure 3 the sectional view taken along A-A in

[0028] Figure 5 is Figure 3 the sectional view taken along B-B in

[0029] Figure 6 is the top view of the hidden mounting plate of the present utility model;

[0030] Figure 7 is Figure 6 the sectional view taken along C-C in

[0031] Figure 8 is the structural schematic diagram of the elastic piece;

[0032] Figure 9 is the front view of the elastic piece;

[0033] Figure 10 is the structural schematic diagram of the hidden mounting plate, connecting plate and PCB board of the present utility model;

[0034] In the figure: 1. housing; 2. mounting plate; 3. PCB board; 4. switch; 5. driving rod; 6. connecting plate; 7. fixing rod; 8. first spring; 9. elastic piece; 10. second spring; 11. insertion hole; 12. guiding hole; 13. clamping platform; 14. buzzer; 21. clamping hole; 61. thickening block; 62. snap ring; 63. clamping groove; 91. arched part; 92. body; 93. fixing plate; 94. convex block. Detailed implementation manners

[0035] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0036] Embodiment 1:

[0037] As Figures 1-5 shown, the present utility model discloses a door-opening anti-theft device, which includes a housing 1 with an open end, and a connecting plate 6 and a mounting plate 2 covering the open end are sequentially connected to the open end of the housing 1. The top view projections of the housing 1, the connecting plate 6 and the mounting plate 2 are all U-shaped.

[0038] A PCB board 3 is installed inside the housing 1, and a shrapnel 9, a switch 4 and a buzzer 14 are installed on the PCB board 3. The PCB board 3 is provided with a circuit, which is connected to the in and out ends of the buzzer 14; the switch 4 and the shrapnel 9 are both installed on this circuit.

[0039] The shrapnel 9 is provided as two symmetrically arranged ones, as Figure 8 and Figure 9 shown, including a body 92 and an arched portion 91. The body 92 is in a flat plate shape, and fixing plates 93 extending vertically in the same direction are provided at both ends thereof, and are fixed to the PCB board 3 by soldering; the arched portion 91 is located at the side of the body 92, and includes a head end, an arc portion and a tail end connected in sequence; the head end is in a straight shape and is integrally formed and connected to the body 92; the arc portion arches away from the fixing plate 93; the tail end is in a straight shape, and a spherical convex block 94 is provided on the side facing the PCB board 3. When the arched portion 91 is not subjected to an external force, the convex block 94 is away from the PCB board 3; when the arched portion 91 is pressed by an external force, the convex block 94 contacts the PCB board 3, and under the combined action of the opening of the switch 4, the circuit is connected.

[0040] A guide hole 12 perpendicular to the bottom of the housing 1 is provided on the opposite side of the arc portion of the housing 1. The guide hole 12 is a blind hole, and a driving rod 5 is inserted therein. A second spring 10 is also connected between the driving rod 5 and the bottom of the guide hole 12 to realize the elastic connection of the driving rod 5, and the guide hole 12 is also used for the telescopic guidance of the driving rod 5.

[0041] As Figure 10 shown, a raised circular clamping plate is provided at the middle position of the driving rod 5, and a driving block extends from the clamping plate toward the arc portion of the housing 1, and the contact piece of the switch 4 is located directly below the driving block. When the driving rod 5 moves toward the bottom of the blind hole, the driving block drives the contact piece, so that the switch 4 is in an open state.

[0042] The housing 1 and the connecting plate 6 are fixed by ultrasonic welding. Among them, a sunken clamping table 13 is provided on the inner side of the open end of the housing 1, and the connecting plate 6 is provided with a clamping ring 62 for clamping the clamping table 13, so as to improve the position accuracy of the housing 1 and the connecting plate 6.

[0043] As Figure 6 and Figure 7 shown, the connecting plate 6 is provided with a through hole corresponding to the arched portion 91, and the top of the arched portion 91 penetrates through the through hole and protrudes from the connecting plate 6 toward the mounting plate 2, and the protruding portion is in a minor arc shape.

[0044] The connecting plate 6 is also provided with a socket hole 11, and the outer end of the driving rod 5 penetrates through the socket hole 11, and the clamping plate abuts against the side of the connecting plate 6 facing the bottom of the housing 1, so as to realize the installation limit of the driving rod 5. A raised thickening block 61 is provided on the side of the connecting plate 6 facing the mounting plate 2, and the insertion pipe penetrates through the thickening block 61, thereby increasing the length of the socket hole 11 and improving the telescopic stability of the driving rod 5.

[0045] A raised rib is provided on the outer side of the mounting plate 2, and the rib is in the shape of an open U. A clamping groove 63 is provided on the inner side surface of the rib. The clamping groove 63 is in the shape of a U, and its opening direction is parallel to the outer side surface of the mounting plate 2. The mounting plate 2 is inserted into the clamping groove 63. On both sides of the guiding hole 12 inside the housing 1, guiding cylinders are further provided. A fixing rod 7 is inserted into the guiding cylinder, and a first spring 8 is connected between the fixing rod 7 and the bottom of the guiding cylinder, so as to realize the elastic connection of the fixing rod 7. A circular clamping plate is provided at the middle position of the fixing rod 7, and the clamping plate abuts against the side surface of the connecting plate 6 facing the bottom of the housing 1 to realize the installation limit. A clamping hole 21 is provided on the mounting plate 2, and the fixing rod 7 is inserted into the clamping hole 21 to realize the installation and fixation of the mounting plate 2. The fixing rod 7 can be adsorbed by a magnet. Therefore, when a magnet is used to adsorb the inner end of the fixing rod 7, the fixing rod 7 can be separated from the mounting plate 2, so that the disassembly and assembly of the mounting plate 2 are facilitated.

[0046] When the mounting plate 2 is inserted into the clamping groove 63, the driving arching part 91 is driven to move towards the PCB board 3, so that the convex block 94 contacts the PCB board 3.

[0047] A double-sided adhesive is pasted on the outer side surface of the mounting plate 2, and it is adhesively fixed on the display window, connecting double doors or connecting the door and the door frame. At this time, the driving rod 5 contracts under the blocking action of the display window and triggers the contact piece, so that the switch 4 is turned on and the circuit is connected.

[0048] When the circuit is connected, the buzzer 14 does not sound an alarm; when the circuit is disconnected, the buzzer 14 sounds an alarm; when the anti-theft device is forcibly separated from the display window by an external force, the driving rod 5 extends out, separates from the switch 4, the switch 4 is turned off, the circuit is disconnected, and the buzzer 14 sounds an alarm; when the mounting plate 2 is maliciously removed by using a magnet, the arching part 91 will bounce up and separate from the PCB board 3, and the buzzer 14 also sounds an alarm. Thus, the utility model realizes double insurance and improves the anti-theft performance of the display window.

[0049] Enlightened by the above ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A door burglar alarm, characterized in that: It comprises a shell (1) with an opening at one end and a mounting plate (2) covering the opening end of the shell (1); A PCB board (3) is installed in the housing (1); A switch (4) is mounted on the PCB board (3); The housing (1) is provided with a retractable driving rod (5); The switch (4) is opened and closed by extending and retracting the drive rod (5); The mounting plate (2) is used for fixed installation on the display window, connecting the double door or connecting the door and the door frame; When the mounting plate (2) is mounted on the display window, the driving rod (5) is compressed and drives the switch (4) to turn on.

2. A door-opening anti-theft device according to claim 1, characterized in that: The driving rod (5) is provided with a shoulder; The housing (1) is provided with a plug-in hole (11); The driving rod (5) passes through the plug hole (11) toward the outside of the mounting plate (2), and its shoulder is engaged with the plug hole (11).

3. A door-opening anti-theft device according to claim 2, characterized in that: The housing (1) is provided with a guide hole (12); The inner end of the driving rod (5) is inserted into the guide hole (12).

4. The door-opening anti-theft device according to claim 3, characterized in that: A connecting plate (6) is provided at the opening end of the housing (1) and located inside the mounting plate (2); The plug-in hole (11) is arranged on the connecting plate (6).

5. The door-opening anti-theft device according to claim 4, characterized in that: The connecting plate (6) is provided with a thickening block (61) protruding outwards, and the plug-in hole (11) passes through the thickening block (61).

6. The door-opening anti-theft device according to claim 4, characterized in that: A protruding snap ring (62) is provided on one side of the connecting plate (6) facing away from the mounting plate (2); A recessed clamping platform (13) is provided inside the open end of the housing (1) for clamping the clamping ring (62).

7. The door-opening anti-theft device according to claim 6, characterized in that: The connecting plate (6) is provided with a slot (63) whose end surface is U-shaped and whose distribution path is also U-shaped, and the mounting plate (2) is inserted into the slot (63); The mounting plate (2) is provided with a clamping hole (21); A fixing rod (7) that can be attracted by a magnet is clamped on the connecting plate (6); one end of the fixing rod (7) is elastically connected to the housing (1) via a first spring (8), and the other end is inserted into the clamping hole (21).

8. The door-opening anti-theft device according to claim 7, characterized in that: The PCB board (3) is also connected to a spring sheet (9); The spring sheet (9) is provided with an elastic arched portion (91), and the arched portion (91) is away from the PCB board (3) when not under pressure; The arched portion (91) penetrates the connecting plate (6) and protrudes outwards; When the mounting plate (2) is engaged with the card slot (63), pressure is applied to the arched portion (91), and the arched portion (91) is flush with the connecting plate (6) and connected to the PCB board (3).

9. The door-opening anti-theft device according to claim 8, characterized in that: The spring piece (9) comprises a body (92), both ends of which are provided with fixing plates (93) extending vertically in the same direction, and are fixed on the PCB board (3) by soldering; One end of the arched portion (91) is integrally connected to the body (92); The arched portion (91) is arc-shaped, and the portion thereof protruding from the connecting plate (6) is in a minor arc shape.

10. The door-opening anti-theft device according to claim 9, characterized in that: A spherical bump (94) is provided at the other end of the arched portion (91), and the bump (94) faces the PCB board (3).

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