A self-locking anti-follow-up linkage door
By using a slider-spring automatic door closing device and a stop bar-rotating column interlocking mechanism, the self-locking and automatic opening and closing of the purely mechanical anti-tailgating linkage door are realized, solving the problems of insufficient reliability and adaptability in the existing technology and improving the safety and reliability of the equipment in harsh environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU YINFANG SCIENCE & TECHNOLOGY CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-06-26
AI Technical Summary
Existing anti-tailgating interlocking gates have poor reliability in harsh environments, their electronic control systems are prone to failure, their mechanical devices are easily worn out, and their replacement costs are high. They also lack adaptability and cannot work effectively in environments without power, posing safety hazards.
The system employs a slider-spring automatic door closing device and a stop-bar-rotating column interlocking mechanism. Through a purely mechanical design, it achieves self-locking and automatic opening and closing of the double doors. By utilizing spring energy storage and the linkage of the rotating rod, it ensures reliable door closing and interlocking.
The self-locking and automatic opening and closing of the double doors in the absence of power improves the environmental adaptability and reliability of the equipment, reduces maintenance costs, avoids the failure of the electrical control system and mechanical wear, and ensures the safety of the area.
Smart Images
Figure CN224413472U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of linkage door technology, and in particular to a self-locking anti-tailgating linkage door. Background Technology
[0002] In scenarios requiring strict personnel control, anti-tailgating interlocking doors are core equipment for ensuring area security. Their core requirement is to prevent unauthorized personnel from tailgating into the area and to achieve double-door interlocking and automatic opening and closing functions. However, current similar equipment has significant shortcomings in terms of environmental adaptability, reliability, and maintenance costs, making it difficult to meet the needs of complex working conditions.
[0003] Electrical control systems rely on electricity and have poor reliability in harsh environments. Most mainstream anti-tailgating interlocking doors use a motor drive + sensor interlocking scheme, relying on the electrical control system to achieve double-door linkage. In engineering scenarios with high humidity and dust concentration, the failure rate of short circuits and sensor malfunctions is high, which seriously affects the safety of the area. When there is no power or a sudden power outage, the electrical control door is often in a state of unlocking failure or double-door jamming, which not only fails to prevent tailgating but also hinders emergency escape, posing a safety hazard.
[0004] Existing mechanical devices rely on the precise coordination of multiple sets of gears for interlocking, which is difficult to install and debug. After long-term use, gear wear can easily lead to failure of both doors opening at the same time. Automatic door closing devices are mostly single spring and hinge structures, and the closing speed is uncontrollable. Impacting the door frame generates noise and can easily cause door deformation, affecting the accuracy of interlocking.
[0005] The replacement cost of easily damaged parts such as motors and sensors in electric doors is high and requires professional operation. The interlocking mechanism of mechanical doors is mostly a customized design that can only be adapted to specific door sizes. When replacing the door, the entire door needs to be modified, resulting in insufficient adaptability.
[0006] To address the aforementioned pain points, the pure mechanical anti-tailgating linkage door proposed in this utility model fills the technological gap of existing equipment through the innovative design of a slider-spring automatic closing device and a stop bar-rotating column interlocking mechanism. Utility Model Content
[0007] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a self-locking anti-tailgating linkage door that can solve the above-mentioned problems.
[0008] To achieve the above objectives, this utility model provides the following technical solution: a self-locking anti-tailgating linkage door, including a door frame, an outer door rotatably installed on one side of the door frame, a door frame also installed behind the outer door, and an inner door rotatably installed on one side of the door frame; a door upper slider assembly is fixedly installed above the outer door, a sliding rod is fixedly installed inside the door upper slider assembly, a slider is slidably connected to the sliding rod, a spring is installed on the sliding rod, and the sliding rod passes through the slider;
[0009] A retractable rod is fixedly connected to the slider, and a receiving module is fixedly installed on the inner side of the upper part of the door frame. A vertical rotating rod is installed on one side inside the receiving module, and one end of the retractable rod is fixedly connected to the rotating rod.
[0010] A linkage module is fixedly installed above the door frames of the outer and inner doors. A rotating rod installed inside the receiving module passes vertically through the door frame and the linkage module. A baffle is fixedly installed at the top of the rotating rod. A stop bar rotating column is installed in the middle of the linkage module. An outer door stop bar and an inner door stop bar are fixedly installed on both sides of the stop bar rotating column, respectively. The same spring connects the inner wall of the linkage module and the outer door stop bar.
[0011] Preferably, the door slider assembly is formed by the slider sliding on the slide rod.
[0012] Preferably, one end of the retractable rod is hinged to the slider, and the other end is fixedly connected to the rotating rod.
[0013] Preferably, the outer door stop and the inner door stop inside the linkage module form a linkage structure through the stop rotation column.
[0014] Preferably, the two ends of the spring are fixed to the inner wall of the door slider assembly and the slider, respectively.
[0015] Preferably, the door slider assembly and its internal components can be housed within a receiving module.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] (1) The self-locking anti-tailgating linkage door has a pull rod fixedly installed on the slider, and a spring fixed inside the slider assembly on the door and on the slider. Energy storage and reset are achieved through elastic deformation. When the outer door is opened, the spring is compressed and stored. When the hand is released, the spring releases energy and pulls the slider to move inward on the slider rod. When the slider moves inward, it drives the pull rod to rotate inward around the rotating rod and retract into the receiving module. At the same time, it drives the outer door to close. The automatic closing and opening device on the inner door side is the same as that on the outer door.
[0018] (2) The self-locking anti-tailgating linkage door has a stop bar rotating column installed in the middle of the linkage module. An inner door stop bar and an outer door stop bar are fixedly installed on both sides of the stop bar rotating column, serving as the linkage fulcrum between the outer door stop bar and the inner door stop bar. The outer door stop bar is directly opposite the linkage module, and the inner door stop bar is tilted at a certain angle and directly opposite the other side of the linkage module, forming a rotating linkage structure. The rotating rod passes through the upper part of the linkage module and is fixed with a baffle. It rotates synchronously with the door body and serves as a signal element to trigger the stop bar. When the outer door is open... When the door is open, the baffle rotates clockwise and pushes the outer door stop bar. The outer door stop bar, through the stop bar rotation column, drives the inner door stop bar to rotate. When the inner door stop bar rotates to a designated position, it will prevent the baffle on one side of the inner door from rotating counterclockwise, thus preventing the inner door from opening. After the outer door is closed, the baffle rotates counterclockwise and no longer pushes the outer door stop bar. The spring set inside the linkage module pulls the outer door stop bar to rotate clockwise. After the inner door stop bar also rotates clockwise, it will no longer prevent the baffle on the inner door from rotating counterclockwise, and the inner door can be opened. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0020] Figure 1 This is an isometric schematic diagram of a self-locking anti-tailgating linkage door according to the present invention;
[0021] Figure 2 This is a top view schematic diagram of a self-locking anti-tailgating linkage door according to the present invention;
[0022] Figure 3 This is a front view schematic diagram of a self-locking anti-tailgating linkage door according to the present invention;
[0023] Figure 4 This is a right-side view of a self-locking anti-tailgating linkage door according to the present invention.
[0024] Reference numerals: 1. Door frame; 2. Outer door; 3. Inner door; 4. Door slider assembly; 5. Sliding rod; 6. Sliding block; 7. Spring; 8. Retracting rod; 9. Receiving module; 10. Rotating rod; 11. Linkage module; 12. Baffle; 13. Outer door stop bar; 14. Inner door stop bar; 15. Stop bar rotating column. Detailed Implementation
[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0027] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.
[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0029] Please see Figure 1-4 This utility model provides a technical solution: a self-locking anti-tailgating linkage door, including a door frame 1, an outer door 2 rotatably installed on one side of the inner side of the door frame 1, a door frame 1 is also installed behind the outer door 2, and an inner door 3 is rotatably installed on one side of the door frame 1.
[0030] A door upper slider assembly 4 is fixedly installed above the outer door 2. A slide rod 5 is fixedly installed inside the door upper slider assembly 4. A slider 6 is slidably connected to the slide rod 5. A spring 7 is installed on the slide rod 5. The slide rod 5 passes through the slider 6. The two ends of the spring 7 are fixed to the inner wall of the door upper slider assembly 4 and the slider 6, respectively.
[0031] A pull rod 8 is fixedly connected to the slider 6. A receiving module 9 is fixedly installed on the inner side of the upper part of the door frame 1. A vertical rotating rod 10 is installed on one side inside the receiving module 9. One end of the pull rod 8 is fixedly connected to the rotating rod 10. The slider assembly 4 on the door and its internal components can be accommodated in the receiving module 9.
[0032] A linkage module 11 is fixedly installed above the door frame 1 of the outer door 2 and the inner door 3. A rotating rod 10 installed inside the receiving module 9 passes vertically through the door frame 1 and the linkage module 11. A baffle 12 is fixedly installed at the top of the rotating rod 10. A stop bar rotating column 15 is installed in the middle of the linkage module 11. An outer door stop bar 13 and an inner door stop bar 14 are fixedly installed on both sides of the stop bar rotating column 15, respectively. The same spring 7 is connected between the inner wall of the linkage module 11 and the outer door stop bar 13.
[0033] Working principle: The entire system includes an outer door 2 and an inner door 3. They are mutually restricted by the linkage module 11 above them to achieve the purpose of preventing tailgating. The door slider assembly 4 installed above the outer door 2 and the receiving module 9 installed on the inner side of the door frame 1 work together to control the automatic closing and opening of the outer door 1. The slider 6 set inside the door slider assembly 4 can move on the sliding rod 5 to ensure smooth and jam-free movement. The pull rod 8 is fixedly installed on the slider 6. The spring 5 is fixed inside the door slider assembly 4 and on the slider 6. It achieves energy storage and reset through elastic deformation. When the outer door 2 is opened, the spring 7 is compressed and stored. When released, the spring 7 releases energy and pulls the slider 6 to move inward on the sliding rod 5. When the slider 6 moves inward, it drives the pull rod 8 to rotate inward around the rotating rod 10 and retract into the receiving module 9. At the same time, it drives the outer door 2 to close. The automatic closing and opening device on the inner door 3 side is the same as that of the outer door 2.
[0034] On the linkage module 11, a stop bar rotating column 15 is installed in the middle. An inner door stop bar 14 and an outer door stop bar 13 are fixedly installed on both sides of the stop bar rotating column 15, serving as the linkage fulcrum between the outer door stop bar 13 and the inner door stop bar 14. The outer door stop bar 13 faces the linkage module 11 directly, while the inner door stop bar 14 is tilted at a certain angle facing the other side of the linkage module 11, forming a rotational linkage structure. The rotating rod 10 passes through the upper part of the linkage module 11 and is fixed with a baffle 12, rotating synchronously with the door body. This baffle 12 acts as a signal element to trigger the stop bar. When the outer door 2 is open, the baffle 12... Rotating clockwise pushes the outer door stop bar 13, which in turn drives the inner door stop bar 14 to rotate via the stop bar rotation column 15. When the inner door stop bar 14 rotates to a designated position, it will prevent the baffle 12 on one side of the inner door 3 from rotating counterclockwise, thus preventing the inner door 3 from opening. After the outer door 2 is closed, the baffle 12 will no longer push the outer door stop bar 13 when rotating counterclockwise. The spring 7 set inside the linkage module 11 pulls the outer door stop bar 13 to rotate clockwise. After the inner door stop bar 14 also rotates clockwise, it will no longer prevent the baffle 12 on the inner door 3 from rotating counterclockwise, and the inner door 3 can be opened.
[0035] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A self-locking anti-tailgating linkage door, comprising a door frame (1), an outer door (2) rotatably installed on one side inside the door frame (1), a door frame (1) also installed behind the outer door (2), and an inner door (3) rotatably installed on one side of the door frame (1); characterized in that: A door upper slider assembly (4) is fixedly installed above the outer door (2). A sliding rod (5) is fixedly installed inside the door upper slider assembly (4). A slider (6) is slidably connected to the sliding rod (5). A spring (7) is installed on the sliding rod (5). The sliding rod (5) passes through the slider (6). A pull rod (8) is fixedly connected to the slider (6), and a receiving module (9) is fixedly installed on the inner side of the upper part of the door frame (1). A vertical rotating rod (10) is installed on one side inside the receiving module (9), and one end of the pull rod (8) is fixedly connected to the rotating rod (10). A linkage module (11) is fixedly installed above the door frame (1) of the outer door (2) and the inner door (3). A rotating rod (10) installed inside the receiving module (9) passes vertically through the door frame (1) and the linkage module (11). A baffle (12) is fixedly installed at the top of the rotating rod (10). A stop rod rotating column (15) is installed in the middle of the linkage module (11). An outer door stop rod (13) and an inner door stop rod (14) are fixedly installed on both sides of the stop rod rotating column (15). The same spring (7) is connected between the inner wall of the linkage module (11) and the outer door stop rod (13).
2. The self-locking anti-tailgating linkage door according to claim 1, characterized in that: The door slider assembly (4) is formed by the sliding of the slider (6) on the slide bar (5).
3. A self-locking anti-tailgating linkage door according to claim 2, characterized in that: One end of the retractable rod (8) is hinged to the slider (6), and the other end is fixedly connected to the rotating rod (10).
4. A self-locking anti-tailgating linkage door according to claim 3, characterized in that: The outer door stop bar (13) and inner door stop bar (14) inside the linkage module (11) form a linkage structure through the stop bar rotating column (15).
5. A self-locking anti-tailgating linkage door according to claim 4, characterized in that: The two ends of the spring (7) are fixed to the inner wall of the door slider assembly (4) and the slider (6), respectively.
6. A self-locking anti-tailgating linkage door according to claim 5, characterized in that: The door slider assembly (4) and its internal components can be housed in the housing module (9).