A theft-proof device for opening and closing a house door

Abstract

This invention relates to a door opening and closing anti-theft device, comprising a housing installed inside a door frame, with a limiting member slidably connected inside the housing. The limiting member is L-shaped, with its vertical section slidably inserted into the housing and its horizontal section located outside the housing. A through hole is provided on the outer end face of the housing, and a limiting protrusion is provided at the bottom of the through hole. A straight sliding groove and an arc-shaped sliding groove are respectively provided on the vertical section of the limiting member. The length direction of the straight sliding groove is consistent with the axial direction of the through hole, and the arc-shaped sliding groove is connected to the straight sliding groove and is located outside the straight sliding groove. The limiting protrusion is slidably engaged in the straight sliding groove or the arc-shaped sliding groove. This device only needs to be fixedly installed inside the door frame, and by pulling and rotating the limiting member, the position of the limiting protrusion changes within the arc-shaped or straight sliding groove, thus limiting the opening of the door. The installation method is simple and inexpensive, suitable for industrial production, and has strong practicality.

Description

Technical Field

[0001] This invention belongs to the technical field of door anti-theft locks, and particularly relates to a door opening and closing anti-theft device. Background Technology

[0002] A patent entitled "A Self-Locking Anti-theft Lock Chain" is disclosed in the existing Chinese patent database. The application number is CN201820569424.3, and the application date is 2018-04-20. This device belongs to the field of anti-theft lock technology and specifically discloses a self-locking anti-theft lock chain, which includes at least a sliding chain and a chain buckle. The sliding chain includes a metal chain and a fixed end and a movable end of the sliding chain respectively located at both ends of the metal chain. The chain buckle is provided with a groove and a chain buckle sliding end and a chain buckle end respectively located at both ends of the groove. It also includes a self-locking device, which includes at least a self-locking flip cover and a hinge for connecting the self-locking flip cover and the chain buckle. In the self-locking state, the self-locking flip cover covers the groove. The aforementioned self-locking anti-theft chain can effectively prevent the sliding chain from being pried open from the door gap by tools, thereby increasing the security of the anti-theft chain lock. When not in use, the self-locking flip cover hangs down naturally under gravity to prevent accidental operation. It has a simple structure, is easy to use, and its functions are clear at a glance. It can be used without the need for an instruction manual, making it particularly suitable for use in public rental places such as hotels, guesthouses, and shared accommodations.

[0003] Existing hotel security chains typically involve installing a mounting base inside the door frame and another mounting base on the door. The security chain is connected to both mounting bases at both ends to achieve its anti-theft function. However, this structure requires fixing devices to be installed on both the door frame and the door, making the installation process cumbersome. Therefore, this solution aims to propose a door opening and closing anti-theft device that only requires the installation of an anti-theft device at the door frame to limit the opening of the door. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing hotel anti-theft chains usually have a mounting base inside the door frame and a mounting base on the room door. The anti-theft chain is connected to each mounting base at both ends to complete the anti-theft function. However, this structure requires fixing devices to be installed on both the door frame and the room door, which is a cumbersome installation process. In order to improve its shortcomings, the present invention provides a door opening and closing anti-theft device.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A door opening and closing anti-theft device includes a housing installed inside a door frame. A limiting member is slidably connected inside the housing. The limiting member is L-shaped, with its vertical section slidably inserted into the housing and its horizontal section located outside the housing. A through hole is provided on the outer end face of the housing, and a limiting protrusion is provided at the bottom of the through hole. A straight sliding groove and an arc-shaped sliding groove are respectively provided on the vertical section of the limiting member. The length direction of the straight sliding groove is consistent with the axial direction of the through hole. The arc-shaped sliding groove is connected to the straight sliding groove and is located outside the straight sliding groove. The limiting protrusion is slidably engaged in the straight sliding groove or the arc-shaped sliding groove.

[0007] As a preferred embodiment, the vertical free end of the limiting member is detachably connected to a limiting plate, and a limiting flange is provided inside the housing at the through hole. When the limiting plate moves to the through hole, the limiting plate abuts against the surface of the limiting flange inside the housing.

[0008] As a preferred embodiment, a compression spring is sleeved on the vertical section of the limiting member located inside the housing. One end of the compression spring abuts against the surface of the limiting plate, and the other end abuts against the surface of the limiting flange.

[0009] As a preferred embodiment, the width of the arc-shaped groove is the same as the width of the limiting protrusion.

[0010] As a preferred embodiment, a connecting plate is integrally provided on the side of the housing, and a plurality of connecting holes are provided on the connecting plate. The housing is fixedly connected to the door frame by bolts passing through the connecting holes.

[0011] Compared with the prior art, the beneficial effects of the present invention are: the device only needs to be fixedly installed inside the door frame, and then the position of the limiting convex shaft in the arc-shaped slide groove or straight slide groove is changed by pulling and rotating the limiting component, which can complete the limiting function of the door opening. The installation method is simple and low cost, and it is suitable for industrial production and has strong practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention.

[0013] Figure 2 This is an exploded view of the structure of the present invention.

[0014] In the diagram: 1. Housing, 2. Limiting component, 201. Vertical section, 202. Horizontal section, 3. Through hole, 4. Limiting protrusion, 5. Straight slide groove, 6. Arc slide groove, 7. Limiting plate, 8. Limiting flange, 9. Compression spring, 10. Connecting plate, 11. Connecting hole. Detailed Implementation

[0015] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1-2As shown, a door opening and closing anti-theft device includes a housing 1 installed inside the door frame. A limiting member 2 is slidably connected inside the housing 1. The limiting member 2 is L-shaped. The vertical section 201 of the limiting member 2 is slidably inserted into the housing 1, and the horizontal section 202 of the limiting member 2 is located outside the housing 1. A through hole 3 is provided on the outer end face of the housing 1. A limiting protrusion 4 is provided at the bottom of the through hole 3. A straight sliding groove 5 and an arc-shaped sliding groove 6 are respectively provided on the vertical section 201 of the limiting member 2. The length direction of the straight sliding groove 5 is consistent with the axial direction of the through hole 3. The arc-shaped sliding groove 6 is connected to the straight sliding groove 5 and is located outside the straight sliding groove 5. The limiting protrusion 4 is slidably engaged in the straight sliding groove 5 or the arc-shaped sliding groove 6. The vertical section 201 of the limiting member 2 is detachably connected to the limiting plate 7 at its free end. A limiting flange 8 is provided inside the housing 1 located at the through hole 3. When the limiting plate 7 moves to the through hole 3, the limiting plate 7 abuts against the surface of the limiting flange 8 inside the housing 1. A compression spring 9 is sleeved on the vertical section 201 of the limiting member 2 located inside the housing 1. One end of the compression spring 9 abuts against the surface of the limiting plate 7, and the other end abuts against the surface of the limiting flange 8. The width of the arc-shaped slide groove 6 is the same as the width of the limiting protrusion 4. A connecting plate 10 is integrally provided on the side of the housing 1. Several connecting holes 11 are opened on the connecting plate 10. The housing 1 is fixed to the door frame through bolts passing through the connecting holes 11.

[0017] During operation, the operator fixes the housing 1 inside the door frame. When it is necessary to internally lock and limit the door, the limiting member 2 is slid inward towards the housing 1. The limiting protrusion 4 moves along the straight slide groove 5 to the arc-shaped slide groove 6. The limiting member 2 is rotated so that the limiting protrusion 4 is positioned within the arc-shaped slide groove 6, thereby limiting the axial displacement of the limiting member 2. At this time, the horizontal section 202 of the limiting member 2 protrudes towards the inside of the door. When the door is opened, it will abut against the horizontal section 202 of the limiting member 2, making it impossible to open. When it is necessary to open the door, the limiting member 2 is rotated so that the limiting protrusion 4 is positioned within the straight slide groove 5. At this time, the horizontal section 202 of the limiting member 2 is not located on the side of the door and cannot limit the door.

[0018] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A door opening and closing anti-theft device, characterized in that: The device includes a housing (1) installed inside the door frame. A limiting member (2) is slidably connected inside the housing (1). The limiting member (2) is L-shaped. The vertical section (201) of the limiting member (2) is slidably inserted into the housing (1), and the horizontal section (202) of the limiting member (2) is located outside the housing (1). A through hole (3) is provided on the outer end face of the housing (1). A limiting protrusion (4) is provided at the bottom of the through hole (3). A straight sliding groove (5) and an arc-shaped sliding groove (6) are respectively provided on the vertical section (201) of the limiting member (2). The length direction of the straight sliding groove (5) is consistent with the axial direction of the through hole (3). The arc-shaped sliding groove (6) and the straight sliding groove (5) are respectively provided with the vertical section (201) of the limiting member (2). The straight slide groove (5) is connected, and the arc slide groove (6) is located on the outside of the straight slide groove (5). The limiting protrusion (4) is slidably engaged in the straight slide groove (5) or the arc slide groove (6). When the door needs to be locked internally, the horizontal section (202) of the limiting member (2) protrudes towards the inside of the door. When the door is opened, it will abut against the horizontal section (202) of the limiting member (2), making it impossible to open. When the door needs to be opened, the limiting member (2) is rotated so that the limiting protrusion (4) is located in the straight slide groove (5). At this time, the horizontal section (202) of the limiting member (2) is not located on the side of the door and cannot limit the door.

2. The door opening and closing anti-theft device according to claim 1, characterized in that: The vertical section (201) of the limiting member (2) is detachably connected to the limiting plate (7) at its free end. A limiting flange (8) is provided inside the housing (1) located at the through hole (3). A compression spring (9) is sleeved on the vertical section (201) of the limiting member (2) located inside the housing (1). One end of the compression spring (9) abuts against the surface of the limiting plate (7), and the other end abuts against the surface of the limiting flange (8).

3. The door opening and closing anti-theft device according to claim 2, characterized in that: The width of the arc-shaped groove (6) is the same as the width of the limiting protrusion (4).

4. A door opening and closing anti-theft device according to any one of claims 1-3, characterized in that: The housing (1) has an integrally formed connecting plate (10) on its side. The connecting plate (10) has several connecting holes (11). The housing (1) is fixed to the door frame by bolts passing through the connecting holes (11).

Images