A type of anti-violent impact safety door latch device

Abstract

This utility model discloses a door latching device for preventing violent impacts, including a door bottom reinforcing back plate, an upper groove plate, an L-shaped pin, and a lower fixing plate. The door bottom reinforcing back plate is horizontally anchored to the back of the bottom of the door panel to enhance the door's rigidity. The upper groove plate is anchored to the reinforcing back plate and the door panel and has a vertical slot. The lower fixing plate is anchored to the floor and has a pre-drilled groove. The upper part of the L-shaped pin has a tenon. When protection against violent impacts is required, the L-shaped pin is inserted vertically from the vertical slot, and its lower end is embedded in the groove of the lower fixing plate, quickly locking the door panel to the floor and forming a reinforced ground anchor point to resist impact loads, achieving the protective effect of adding a ground locking support point to the original door. When protection is not needed, the L-shaped pin can be pulled upwards to restore the normal opening and closing of the door panel. This device has a simple process, reasonable force distribution, and is easy to install and dismantle, and can be effectively applied to safety protection in emergency situations.

Description

Technical Field

[0001] This utility model belongs to the field of door safety protection technology, and is specifically designed for emergency anti-violent impact scenarios, involving the development and application of a safety door latch device to enhance the impact resistance of doors. Background Technology

[0002] In public buildings (such as campuses, hospitals, and shopping malls), financial institutions (bank branches, vault access passages), and special control sites (emergency command centers, valuables storage rooms), doors serve as the core node for personnel passage and security protection. They must simultaneously meet the dual requirements of "convenient daily opening and closing" and "emergency protection against violent attacks." This contradiction drives the continuous iteration of door security protection technology.

[0003] Current mainstream solutions have significant limitations: First, traditional reinforced security doors rely on thickened door panels and reinforced hinges for fixed structures. While this improves impact resistance, the doors are too heavy, making daily opening and closing difficult. Furthermore, retrofitting existing building doors requires dismantling the original structure, resulting in long construction periods and high costs, making it difficult to meet the needs of upgrading existing buildings. Second, temporary reinforcement devices (such as external top rods and latch locks) are mostly general-purpose accessories, lacking precise design to fit the door and floor. They either loosen easily after installation, leading to protection failure, or require damage to the door or ground for fixing, failing to balance "emergency response speed" and "structural integrity protection." Third, existing devices generally neglect "the efficiency of switching between temporary protection and normal use." Most reinforcement devices require specialized tools for disassembly, which can delay passage when emergency protection is removed, contradicting the requirement of "emergency evacuation priority" in public places.

[0004] With increasing societal demands for improved public safety emergency response efficiency and growing needs for upgrading the safety of existing buildings, the market urgently requires a door reinforcement technology that requires no modification to the core structure of the door, is easy to install and dismantle, and can quickly switch between "normal use" and "emergency protection" modes. This technology fills the gaps in existing solutions regarding "convenience," "adaptability," and "protection reliability," providing a clear scenario for the research and development and application of anti-violent impact safety door latch devices. Utility Model Content

[0005] This utility model discloses a safety door latch device for preventing violent impacts, which aims to solve the problem of "imbalance between reinforcement and convenience" in existing door protection solutions. Through modular structural design, it achieves the dual goals of "rapid switching in emergency protection" and "no interference in daily use". Its core content revolves around the structural coordination and functional adaptation of four key components.

[0006] From an overall structural perspective, the device consists of a door bottom reinforcing back plate, an upper mother groove plate, an L-shaped pin, and a lower fixing plate. These four components are precisely assembled to form a complete protective system. The door bottom reinforcing back plate is a long strip of metal (treated with rust prevention) that is horizontally anchored to the back of the bottom of the door panel with screws. This design increases the load-bearing area at the bottom of the door panel, directly enhancing the rigidity of the door bottom. Unlike traditional solutions that rely solely on the strength of the door panel itself, this design effectively disperses impact loads, preventing localized deformation of the door panel under violent impacts and providing a stable installation foundation for the subsequent locking structure.

[0007] The upper female groove plate, as a key component connecting the door body and the latch, is simultaneously anchored to the bottom reinforcing back plate and the door panel by screws. A vertical slot is opened in the middle of the plate. This slot provides a smooth insertion and removal channel for the L-shaped latch and can also form a tight sliding fit with the tenon on the upper part of the L-shaped latch. Through the adaptation of the two, the vertical insertion and removal trajectory of the latch can be strictly limited, preventing the latch from failing to lock due to lateral displacement. This ensures that the latch can quickly and accurately engage in the locking position in an emergency, guaranteeing the reliability of the protective state.

[0008] The lower fixing plate is anchored to the floor with screws. A recessed hole is pre-drilled in the center of the plate, aligning precisely with the vertical slot of the upper mounting plate. This allows for accurate reception of the lower end of the L-shaped pin, forming a rigid anchor point between the door panel and the floor. When impact protection is required, simply insert the L-shaped pin vertically into the slot; its lower end will then be locked into the recessed hole, providing an additional ground-based locking point for the door, effectively resisting lateral impact loads. When protection is not needed, simply pull the pin upwards to restore normal door opening and closing. The entire switching process requires no special tools, making it convenient and efficient.

[0009] The device has a simple overall process, and all components are anchored with screws, without damaging the original door or floor structure. It can be adapted to door panels of various materials such as wood and metal, and can be widely used for emergency protection in public places such as campuses, hospitals, and shopping malls, truly realizing the practical value of "reliable structure, convenient use, and universal application". Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a three-dimensional perspective view of the anti-violent impact safety door latch device in this case, clearly showing the assembly relationship and structural features of the device's core components.

[0011] Door bottom reinforcement back panel (1): It is a long strip-shaped plate structure, which is anchored to the bottom back of the door panel (6) in the horizontal direction by screws (5). It is used to enhance the bottom rigidity of the door panel (6), prevent the door panel (6) from deforming when impacted, and provide a stable foundation for the installation of subsequent components.

[0012] Upper mother slot plate (2): It is simultaneously anchored to the corresponding positions of the door bottom reinforcing back plate (1) and the door panel (6) by screws (5). A vertical slot (21) is provided in the middle of the plate. The size of the vertical slot (21) is adapted to the L-shaped pin (3) to limit the insertion and removal trajectory of the L-shaped pin (3).

[0013] L-shaped pin (3): The whole is L-shaped, with a tenon (31) integrally formed on the upper part. The tenon (31) can slide and engage with the vertical slot (21) of the upper female groove plate (2). The lower end of the pin is the lower end point (32). The shape of the lower end point (32) matches the groove hole (41) of the lower fixing plate (4) to ensure that there is no loosening after it is fixed.

[0014] The lower fixing plate (4) is fixed to the floor (8) by screws (5). A groove hole (41) is reserved in the center of the plate. The position of the groove hole (41) is directly opposite to the vertical slot (21) of the upper female groove plate (2), with a deviation of no more than 2mm. It is used to receive the lower end point (32) of the L-shaped pin (3) to achieve locking.

[0015] In addition, the figure also shows the components related to the working state of the device: the door panel (6) is the door structure to be protected, and the floor (8) is the ground foundation for the device; when protection is required, the L-shaped pin (3) is inserted into the vertical slot (21), and the lower end (32) is embedded in the groove hole (41) to form a lock between the door panel (6) and the floor (8); when protection is not required, the door panel (6) can be opened and closed by pulling out the L-shaped pin (3). The component numbers correspond completely to the aforementioned specific implementation method to ensure the consistency of the structural diagram. Specific implementation methods

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0017] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. The utility model will now be described in detail with reference to the embodiments and accompanying drawings.

[0018] The specific implementation method of this utility model patent consists of two steps: installation and use. It is simple to operate and does not require damage to the original structure of the door, as detailed below:

[0019] During the installation phase, the following components and tools must be prepared: a long, strip-shaped metal door bottom reinforcing back panel, an upper female groove plate with vertical slots, an L-shaped pin with a tenon at the top, a lower fixing plate with pre-drilled grooves, and matching screws and drilling tools. The first step is to fix the door bottom reinforcing back panel, horizontally attaching it to the back of the bottom of the door panel. After marking the anchor points, drill holes and screw the back panel through the screws into the door panel, ensuring a tight fit to enhance the rigidity of the door bottom. The second step is to install the lower fixing plate. Mark the corresponding points on the floor according to the back panel's position, drill holes, and anchor the fixing plate to the floor with screws, ensuring that its pre-drilled grooves are vertically aligned with the installation position on the side of the door panel. The third step is to install the female groove plate, attaching it to the outside of the reinforcing back panel and covering part of the door panel. After drilling holes, simultaneously anchor it to the back panel and door panel with screws, ensuring that the vertical slots face downwards and that the center axis of the slots coincides with the center axis of the grooves in the lower fixing plate.

[0020] Usage: When protection against violent impact is required, hold the upper part of the L-shaped pin, align the protrusion with the vertical slot of the upper female groove plate, and insert it vertically until the lower end of the pin is completely embedded in the groove hole of the lower fixing plate, thus locking the door panel to the floor; when no protection is required, pull the L-shaped pin upwards until it is completely disengaged from the slot to restore the normal opening and closing of the door panel. No professional tools are required throughout the process, and the emergency response is rapid. Example

[0021] This embodiment describes the deployment of a violent impact-resistant safety door latch device on the emergency exit door (90cm wide, 210cm high, wooden composite door panel) on the third floor of a school teaching building, to meet the emergency protection needs of sudden safety incidents on campus.

[0022] I. Implementation Preparation

[0023] The following components are made of cold-rolled steel sheet (3mm thick, rust-proof): door bottom reinforcing back plate (80cm long, 10cm wide), upper female groove plate (15cm long, 8cm wide, vertical slot width 3cm), L-shaped pin (total length 30cm, tenon length 5cm), lower fixing plate (15cm long, 12cm wide, groove hole diameter 3.2cm), and matched with galvanized self-tapping screws (5mm diameter).

[0024] II. Installation Steps

[0025] Door end installation: Horizontally attach the door bottom reinforcement back plate to the back of the bottom of the door panel (5cm from the ground) and anchor it with 6 screws evenly distributed; then align the upper female groove plate with the center of the reinforcement back plate and fix the upper female groove plate, reinforcement back plate and door panel with 2 screws through the upper female groove plate, ensuring that the vertical slot is vertically downward.

[0026] Floor-side installation: On the floor directly below the slot of the upper motherboard after the door is closed, attach the lower fixing plate and anchor it to the concrete floor with two expansion bolts that penetrate the fixing plate, ensuring that the groove hole is aligned with the center of the slot with a deviation of no more than 2mm.

[0027] Debugging and adaptation: Insert the L-shaped pin into the vertical slot, test the smoothness of insertion and removal, ensure that the lower end of the pin can be fully embedded in the groove hole of the lower fixing plate, lock the rear door panel without shaking, and pull out the rear door panel to open and close normally.

[0028] III. Use and Maintenance

[0029] Under normal circumstances, the L-shaped latch can be pulled out and stored on a special hook next to the door. In the event of a violent impact (such as a collision by an outsider), the teacher on duty can insert the latch within 5 seconds to lock it. The device can withstand a lateral impact force of 500N, preventing the door panel from deforming or being forced open. The tightness of the screws and the lubrication of the latch are checked monthly by the logistics staff to ensure reliable activation in emergencies and to meet the high-frequency inspection needs of campus security management.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A security door strike device for preventing violent impact, characterized by: The device includes a door bottom reinforcing back panel, an upper female groove plate, an L-shaped pin, and a lower fixing plate. The door bottom reinforcing back panel is horizontally anchored to the back of the bottom of the door panel with screws. The upper female groove plate is simultaneously anchored to the door bottom reinforcing back panel and the door panel with screws and has a vertical slot. The lower fixing plate is anchored to the floor with screws and has a pre-drilled groove. The L-shaped pin has a tenon at the top. When protection against violent impact is required, the L-shaped pin is inserted vertically from the vertical slot, and its lower end is embedded in the groove of the lower fixing plate to lock the door panel to the floor to resist impact loads. When no protection is needed, the door panel can be opened and closed normally by pulling out the L-shaped pin.

2. The anti-violent-impact door buckle device according to claim 1, characterized in that: The door bottom reinforcing back plate is a long strip of metal plate. By increasing the force-bearing area at the bottom of the door panel, the rigidity of the bottom of the door panel is enhanced, preventing deformation of the door panel when impacted, and providing a stable installation foundation for the upper mother groove plate.

3. The anti-impact security door catch device of claim 1, wherein: The protruding tenon of the L-shaped pin is adapted to the vertical slot size of the upper female groove plate. The sliding fit between the protruding tenon and the slot limits the insertion and removal trajectory of the pin, preventing the pin from shifting laterally and causing locking failure.

4. The anti-violent-impact door buckle device according to claim 1, characterized in that: The lower fixing plate is a metal plate, and its reserved groove hole is adapted to the shape and size of the lower end of the L-shaped pin to ensure that the pin is not loose after being fixed and to improve the impact resistance stability after the door panel is locked to the floor.

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