Anti-theft device for steel door

Abstract

The utility model discloses an anti-theft device for a steel door, and relates to the field of anti-theft devices. The anti-theft device for the steel door comprises a spring bolt, a spring bolt fixing seat fixedly connected with the first side of a door plate and a spring bolt fixing mechanism used for fixing the spring bolt, and the spring bolt fixing mechanism comprises a pentagonal bolt, a bolt fixing seat and a dismounting handle used for mounting or dismounting the pentagonal bolt. The spring bolt fixing base is connected with a door frame in a welded mode, a through hole is formed in the spring bolt fixing base, the first end of the spring bolt can penetrate through the through hole, a fixing hole is formed in the second end of the spring bolt, and when at least part of the first end of the spring bolt is located in the through hole, the spring bolt is fixed through the fixing hole. And the pentagonal bolt can penetrate through the fixing hole and is in threaded connection with the bolt fixing seat. The problems that in the prior art, the anti-theft performance is weak, the mechanical structure redundancy is high, and the maintenance cost is high can be solved.

Description

Technical Field

[0001] This application relates to the field of anti-theft devices, and more particularly to anti-theft devices for steel doors. Background Technology

[0002] Current steel door anti-theft devices generally suffer from the following technical defects: On the one hand, traditional lock tongue fixing structures mostly use conventional hexagonal bolts or cross bolts for connection. These standard fasteners are easy to disassemble with common tools, posing significant security risks to anti-theft performance; on the other hand, existing anti-theft devices usually require complex transmission mechanisms to achieve multi-point locking, which not only increases the complexity of the door structure but also leads to difficulties in installation and maintenance, significantly increasing manufacturing costs. Utility Model Content

[0003] To address the problems of weak anti-theft performance, high redundancy in mechanical structure, and high maintenance costs in existing technologies, this application provides an anti-theft device for steel doors, the specific solution of which is as follows:

[0004] An anti-theft device for steel doors includes a latch, a latch fixing seat fixedly connected to the first side of the door panel, and a latch fixing mechanism for fixing the latch. The latch fixing mechanism includes a pentagonal bolt, a bolt fixing seat, and a handle for installing or removing the pentagonal bolt. The latch fixing seat is welded to the door frame. The latch fixing seat has a through hole through which the first end of the latch can pass. The second end of the latch has a fixing hole. When the first end of the latch is at least partially located in the through hole, the pentagonal bolt can pass through the fixing hole and be threadedly connected to the bolt fixing seat.

[0005] Preferably, the disassembly handle includes a handle body and a sleeve coaxial with the handle body. The sleeve has a pentagonal prism-shaped cavity inside. The sleeve can be fitted onto the head of the bolt and drive the bolt to rotate.

[0006] Preferably, the handle body includes a rotating handle and a connecting handle, the rotating handle is fixedly connected to the sleeve through the connecting handle, the connecting handle is coaxially arranged with the sleeve, and the rotating handle is perpendicular to the connecting handle.

[0007] Preferably, the locking tongue fixing mechanism further includes a pull block fixedly connected to the second end of the locking tongue. The pull block has a columnar rotating through hole, which is coaxial with the fixing hole. The sleeve is cylindrical. After the sleeve is inserted into the columnar rotating through hole, the sleeve is fitted onto the head of the bolt. The sleeve can be rotated by rotating the handle body.

[0008] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0009] 1. Through the design of non-standard pentagonal bolts and special disassembly and assembly handles, the pentagonal prism cavity inside the sleeve is precisely matched with the head of the pentagonal bolt, forming a unique binding relationship between the tool and the fastener, making it impossible to disassemble with conventional tools.

[0010] 2. The locking mechanism adopts a direct connection between the locking tongue fixing seat and the pentagonal bolt, eliminating the traditional gear set or hydraulic transmission system, which reduces the number of parts in the locking mechanism, makes it easier to maintain, and reduces the cost of later maintenance.

[0011] 3. By setting a pull block with a columnar rotating through hole, it is convenient to disassemble and assemble the handle, and also convenient to push and pull the lock tongue.

[0012] 4. When the latch is subjected to external force, the threaded engagement surface of the pentagonal bolt and the bolt fixing seat will undergo progressive deformation, which means that the more it is damaged, the tighter it becomes, thus ensuring theft prevention. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram of the anti-theft device for steel doors according to this application;

[0015] Figure 2 yes Figure 1 A cross-sectional view along section line AA;

[0016] Figure 3 This is a schematic diagram of the locking tongue fixing mechanism of this application;

[0017] Figure 4 This is a schematic diagram of the disassembly and assembly of the handle in this application.

[0018] In the diagram: 1. Door panel; 2. Door frame; 21. Protrusion; 3. Lock tongue fixing seat; 4. Lock tongue; 51. Pentagonal bolt; 52. Bolt fixing seat; 53. Disassembly handle; 531. Handle body; 531-a. Rotating handle; 531-b. Connecting handle; 532. Sleeve; 54. Pull block; 541. Columnar rotating through hole; 6. Sealing strip. Detailed Implementation

[0019] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in this application are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Please refer to the following: Figures 1-4 A steel door anti-theft device includes a latch 4, a latch fixing seat 3 fixedly connected to the first side of the door panel 1, and a latch fixing mechanism for fixing the latch 4. The latch fixing mechanism includes a pentagonal bolt 51, a bolt fixing seat 52, and a disassembly and assembly handle 53 for installing or removing the pentagonal bolt 51. The latch fixing seat 3 is welded to the door frame. The latch fixing seat 3 has a through hole, through which the first end of the latch 4 can pass. The second end of the latch 4 has a fixing hole. When the first end of the latch 4 is at least partially located in the through hole, the pentagonal bolt 51 can pass through the fixing hole and be threadedly connected to the bolt fixing seat 52. The door panel 1 is hinged to the door frame 2, and the steel door anti-theft device can restrict the opening and closing of the door panel 1.

[0021] Specifically, please refer to the following: Figure 4 The disassembly handle 53 includes a handle body 531 and a sleeve 532 coaxial with the handle body 531. The sleeve 532 has a pentagonal prism-shaped cavity inside. The sleeve 532 can be fitted onto the head of the bolt and drive the bolt to rotate.

[0022] Specifically, please refer to the following: Figure 4 The handle body 531 includes a rotating handle 531-a and a connecting handle 531-b. The rotating handle 531-a is fixedly connected to the sleeve 532 through the connecting handle 531-b. The connecting handle 531-b is coaxially arranged with the sleeve 532, and the rotating handle 531-a is perpendicular to the connecting handle 531-b.

[0023] Specifically, please refer to the following: Figure 3 and Figure 4 The locking tongue fixing mechanism also includes a pull block 54 fixedly connected to the second end of the locking tongue 4. The pull block 54 has a columnar rotating through hole 541, which is coaxial with the fixing hole. The sleeve 532 is cylindrical. After the sleeve 532 is inserted into the columnar rotating through hole 541, the sleeve 532 is sleeved on the head of the bolt. The sleeve 532 can be rotated by rotating the handle body 531.

[0024] Specifically, please refer to the following: Figure 2A sealing strip 6 is fixedly provided on the first side of the door panel 1. When the door panel 1 is closed, the sealing strip 6 is tightly fitted to the door frame 2.

[0025] Specifically, please refer to the following: Figure 2 The door frame 2 and the sealing strip 6 are fitted with a protrusion 21.

[0026] When locking is required, first insert the first end of the locking tongue 4 into the through hole of the locking tongue fixing seat 3 until the fixing hole of the second end of the locking tongue 4 is aligned with the threaded hole of the bolt fixing seat 52; then pass the pentagonal bolt through both the fixing hole and the threaded hole; finally, align the sleeve 532 of the disassembly handle 53 with the head of the pentagonal bolt 51, insert it into the cylindrical rotating through hole 541 of the pull block 54, and rotate the handle body 531 clockwise to drive the pentagonal bolt 51 to engage with the threaded bolt fixing seat 52. This application achieves a unique tool binding through the non-standard fit between the sleeve 532 and the pentagonal prism head of the pentagonal bolt 51, making it impossible to apply effective torque using a general-purpose wrench.

[0027] When unlocking is required, insert the sleeve 532 of the dedicated disassembly handle 53 into the cylindrical rotating through hole 541 of the pull block 54, so that the pentagonal cavity of the sleeve 532 precisely engages with the head of the pentagonal bolt 51, and rotate the handle body 531 counterclockwise to drive the pentagonal bolt 51 out of the bolt fixing seat 52. At the same time, pull the pull block 54 to drive the lock tongue 4 to retract axially along the through hole until the lock tongue 4 is completely disengaged from the fixing seat 3. At this time, the wedge-shaped engagement pressure between the sealing strip 6 and the door frame protrusion 21 is released simultaneously, and the door panel 1 can be opened freely.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0029] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of this application and its equivalents, this application also intends to include such modifications and variations.

Claims

1. An anti-theft device for steel doors, characterized in that, The device includes a latch, a latch fixing seat fixedly connected to the first side of the door panel, and a latch fixing mechanism for fixing the latch. The latch fixing mechanism includes a pentagonal bolt, a bolt fixing seat, and a handle for installing or removing the pentagonal bolt. The latch fixing seat is welded to the door frame. The latch fixing seat has a through hole through which the first end of the latch can pass. The second end of the latch has a fixing hole. When the first end of the latch is at least partially located in the through hole, the pentagonal bolt can pass through the fixing hole and be threadedly connected to the bolt fixing seat.

2. The anti-theft device for steel doors as described in claim 1, characterized in that, The disassembly handle includes a handle body and a sleeve coaxial with the handle body. The sleeve has a pentagonal prism-shaped cavity inside. The sleeve can be fitted onto the head of the bolt and drive the bolt to rotate.

3. The anti-theft device for steel doors as described in claim 2, characterized in that, The handle body includes a rotating handle and a connecting handle. The rotating handle is fixedly connected to the sleeve through the connecting handle. The connecting handle is coaxial with the sleeve, and the rotating handle is perpendicular to the connecting handle.

4. The anti-theft device for steel doors as described in claim 2 or 3, characterized in that, The locking tongue fixing mechanism also includes a pull block fixedly connected to the second end of the locking tongue. The pull block has a columnar rotating through hole, which is coaxial with the fixing hole. The sleeve is cylindrical. After the sleeve is inserted into the columnar rotating through hole, the sleeve is fitted onto the head of the bolt. The sleeve can be rotated by rotating the handle body.

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