A security door push rod lock anti-unlocking device
By employing a dual authorization mechanism of exclusive key and fingerprint, along with a friction braking structure, the problem of easy cracking and cumbersome operation of traditional security door push bar locks is solved, achieving convenient, reliable, and efficient multi-layered protection for security doors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU CHANGQING TRAFFIC TECH
- Filing Date
- 2025-08-28
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional push-bar locks for security doors lack multiple layers of protection, making them easy for outsiders to break, and their over-reliance on keys makes it difficult to balance convenience and security.
It employs a dual authorization mechanism of exclusive key and fingerprint, combined with a friction braking structure and elastic reset system, to ensure precise reset of the lock tongue and prevent unauthorized opening.
It effectively prevents unauthorized personnel from entering, simplifies operating procedures, improves convenience and security, and balances security protection and passage efficiency in multiple application scenarios.
Smart Images
Figure CN224579207U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of push rod lock technology, specifically a safety door push rod lock anti-unlocking device. Background Technology
[0002] In scenarios with extremely high security control requirements, such as rail transit and large public places, security doors are key facilities for area isolation and protection, and the performance of their matching locks directly affects the overall security level and passage efficiency.
[0003] Traditional security door push-bar locks mostly rely on a single mechanical lock cylinder or a simple authorization mechanism, lacking multiple layers of protection. This makes it extremely easy for unauthorized personnel to break the locks using unauthorized methods such as forging keys or forced entry. Consequently, when the area is unattended, a single lock is insufficient to form an effective barrier, posing a serious threat to the area's security.
[0004] Meanwhile, traditional locks rely too heavily on keys as the sole unlocking credential, which not only makes keys inconvenient to carry, easy to lose, and costly to store, but also causes delays in finding keys in emergencies, directly reducing passage efficiency and emergency response speed, making it difficult to meet the dual requirements of convenience and security in high-security scenarios.
[0005] Therefore, we propose a safety door push rod lock anti-unlocking device to solve the problems mentioned above. Utility Model Content
[0006] The purpose of this utility model is to provide a security door push rod lock anti-unlocking device to solve the problem mentioned in the background art that existing locks lack multiple protection designs, making it easy for outsiders to unlock and over-relying on keys to open security doors.
[0007] This utility model provides the following technical solution: a safety door push rod lock anti-unlocking device, including a safety door panel, a groove is formed in the safety door panel, a lock box is installed in the groove, a notch is formed on the side wall of the lock box, an outer lock assembly and an inner lock assembly are installed in the lock box, the outer lock assembly includes a lock tongue slidably connected in the notch, a slot is formed on the surface of the safety door panel, an mounting plate is engaged in the slot, a lock frame is mounted on the mounting plate, a lock cylinder is mounted on the lock frame, and a key is engaged in the lock cylinder.
[0008] Preferably, the external lock assembly includes a receiving cavity formed within the lock box, a fixing block is fixed within the receiving cavity, a slide rod is slidably connected within the fixing block, a spring is sleeved around the outer ring of the slide rod, and the slide rod is fixedly connected to the lock tongue.
[0009] Preferably, one end of the spring is fixedly connected to the side wall of the fixing block, and the other end of the spring is fixedly connected to the side wall of the locking tongue.
[0010] Preferably, a rotating core one is rotatably connected inside the lock box, and a convex ring is fixedly sleeved on the outer ring of the rotating core one. An annular groove is opened inside the convex ring, and the convex ring is sleeved with the slide rod. A rotating core two is installed inside the connection between the mounting plate and the safety door panel. Convex rods are symmetrically fixed on both sides of the slide rod, and the convex rods are located on the side of the convex ring.
[0011] Preferably, the first rotating core, the second rotating core, and the lock cylinder have the same shape, and each of the first rotating core, the second rotating core, and the lock cylinder has a slot that is adapted to the shape of the key.
[0012] Preferably, the external lock assembly includes a limiting strip fixedly connected to the other side of the security door panel. The limiting strips are symmetrically arranged, and a sliding plate is slidably mounted on the limiting strip. A push-pull plate is fixed to the end of the sliding plate, and a fixing rod is fixed inside the sliding plate. A touch button is mounted on the fixing rod.
[0013] Preferably, an embedded rod is fixed inside the fixed rod, and a cavity is opened inside the embedded rod. A movable rod is slidably connected inside the cavity, and a second spring is fixed to the side wall of the movable rod. The other end of the second spring is fixedly connected to the inner wall of the cavity.
[0014] Preferably, a permanent magnet is fixed to the other side of the movable rod, a spring three is sleeved on the outer ring of the movable rod, one end of the spring three is fixedly connected to the permanent magnet, the other end of the spring three is fixedly connected to the inner rod, two protruding rods are provided, one of which is fixed to the side wall near the permanent magnet and is electrically connected to the touch button.
[0015] This utility model has the following beneficial effects:
[0016] 1. The device adopts a dual authorization mechanism of exclusive key and fingerprint. Unauthorized personnel cannot open the car door without the key or authorized fingerprint, effectively preventing unauthorized personnel from entering the driver's cab. At the same time, the friction braking structure formed by the movable rod and the convex rod can resist the violent cracking attempts of external tools, ensuring the safety of the area even if no one is in the driver's cab.
[0017] 2. After installation, the device makes it easy for drivers to enter and exit. The external lock can be opened by turning the key, and the internal lock can be opened by pushing the push-pull plate. No complicated operation steps are required. Moreover, the reset of each component is automatically completed by the spring system, eliminating the trouble of manual reset and improving the convenience of use.
[0018] 3. This device is not only suitable for the driver's cab door scenario, but can also be applied to the door between the employee area and the passenger area. In the employee area scenario, employees can open the door by authorized touch button without relying on the emergency key, which not only ensures the convenience of employee passage, but also effectively isolates the passenger area and the employee area, taking into account both safety and efficiency.
[0019] 4. This device uses an elastic reset system composed of spring one, spring two, and spring three to ensure that components such as the bolt, moving rod, and permanent magnet can automatically and accurately reset after unlocking. The bolt engages tightly with the door frame latch, and the door returns to its nominal locking position, avoiding the locking failure problem caused by inaccurate reset in traditional mechanical locks.
[0020] 5. This device can be flexibly applied to various scenarios such as driver's cab doors and isolation doors between employee and passenger areas. It does not require separate design for different scenarios, has strong compatibility, and while strictly ensuring safety isolation, it achieves a high-efficiency balance between safety protection and passage efficiency by simplifying the operation process for authorized personnel, thus meeting the practical requirements of high-safety scenarios. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .
[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .
[0023] Figure 3 For the present utility model Figure 2 Sectional view.
[0024] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.
[0025] Figure 5 This is a schematic diagram of the installation structure of the safety door panel and lock box of this utility model.
[0026] Figure 6 This is a schematic diagram of the external locking component of this utility model.
[0027] Figure 7 This is a schematic diagram of the external locking assembly and the internal locking assembly of this utility model. Figure 1 .
[0028] Figure 8 This is a schematic diagram of the external locking assembly and the internal locking assembly of this utility model. Figure 2 .
[0029] Figure 9 For the present utility model Figure 8 Enlarged structural diagram at point B.
[0030] Figure 10 This is a schematic diagram of the key structure of this utility model.
[0031] In the diagram: 1. Security door panel; 2. Groove; 3. Lock box; 31. Receiving cavity; 4. Notch; 5. External lock assembly; 51. Fixing block; 52. Slide rod; 53. Spring 1; 54. Lock tongue; 55. Protruding rod; 56. Rotary core 1; 57. Protruding ring; 58. Annular groove; 59. Rotary core 2; 6. Slot; 7. Mounting plate; 8. Lock frame; 9. Lock cylinder; 91. Slot; 10. Key; 11. Internal lock assembly; 111. Limiting strip; 112. Slide plate; 113. Push-pull plate; 14. Fixing rod; 115. Touch button; 116. Embedded rod; 117. Cavity; 118. Spring 2; 119. Movable rod; 120. Permanent magnet; 121. Spring 3; 122. Electromagnet. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] Example 1:
[0034] This embodiment aims to address the shortcomings of traditional safety door push-bar locks in applications such as driver's cabs, employee areas, and passenger areas, including insufficient security, cumbersome operation, and poor reliability. Please refer to [link / reference]. Figure 1 - Figure 10 A safety door push rod lock anti-unlocking device includes a safety door plate 1, a groove 2 inside the safety door plate 1, a lock box 3 installed in the groove 2, the lock box 3 being made of high-strength metal material with good impact resistance, a notch 4 on the side wall of the lock box 3, an inner lock assembly 11 installed inside the lock box 3, and an outer lock assembly 5 including a latch 54 slidably connected in the notch 4, the notch 4 providing a channel for the extension and retraction of the latch 54, the latch 54 being made of wear-resistant alloy material to ensure that it is not easily damaged during long-term use, a slot 6 on the surface of the safety door plate 1, a mounting plate 7 being engaged in the slot 6, a lock frame 8 being mounted on the mounting plate 7, a lock cylinder 9 being mounted on the lock frame 8, and a key 10 being engaged in the lock cylinder 9, the unlocking operation can be achieved by rotating the key 10.
[0035] The external lock assembly 5 includes a receiving cavity 31 opened in the lock box 3, which provides installation space for internal components. A fixing block 51 is fixed in the receiving cavity 31, and a slide rod 52 is slidably connected in the fixing block 51. The slide rod 52 can slide freely along the axial direction of the fixing block 51. A spring 53 is sleeved on the outer ring of the slide rod 52. The slide rod 52 is fixedly connected to the lock tongue 54. One end of the spring 53 is fixedly connected to the side wall of the fixing block 51, and the other end of the spring 53 is fixedly connected to the side wall of the lock tongue 54.
[0036] Rotary core 56 is rotatably connected inside lock box 3. A convex ring 57 is fixedly sleeved on the outer ring of rotary core 56. An annular groove 58 is opened inside the convex ring 57. The convex ring 57 is sleeved with slide rod 52. Rotary core 59 is installed inside the connection between mounting plate 7 and safety door plate 1. Convex rods 55 are symmetrically fixed on both sides of slide rod 52. The convex rods 55 are located on the end side of convex ring 57. Rotary core 56, rotary core 59 and lock cylinder 9 have the same shape. Slots 91 are opened inside rotary core 56, rotary core 59 and lock cylinder 9. Slots 91 are adapted to the shape of key 10, ensuring that the same key 10 can operate the three parts, realizing the uniformity of operation.
[0037] The lock box 3 is equipped with an external lock assembly 5. The external lock assembly 5 includes a limiting strip 111 fixedly connected to the other side of the safety door panel 1. The limiting strips 111 are symmetrically arranged. A slide plate 112 is slidably installed on the limiting strips 111. The limiting strips 111 guide and limit the sliding of the slide plate 112. A push-pull plate 113 is fixed to the end of the slide plate 112. A fixing rod 14 is fixed inside the slide plate 112. A touch button 115 is installed on the fixing rod 14 to control the on / off state of the electromagnet 122.
[0038] An embedded rod 116 is fixed inside the fixed rod 14. A cavity 117 is opened inside the embedded rod 116. A movable rod 119 is slidably connected inside the cavity 117. A second spring 118 is fixed to the side wall of the movable rod 119. The other end of the second spring 118 is fixedly connected to the inner wall of the cavity 117.
[0039] A permanent magnet 120 is fixed on the other side of the movable rod 119. A spring 121 is sleeved on the outer ring of the movable rod 119. One end of the spring 121 is fixedly connected to the permanent magnet 120, and the other end of the spring 121 is fixedly connected to the inner rod 116. The spring 121 plays a buffering and resetting role for the movement of the permanent magnet 120. There are two protruding rods 55. An electromagnet 122 is fixed on the side wall of the end near the permanent magnet 120. The electromagnet 122 is electrically connected to the touch button 115. The touch button 115 can control the electromagnet 122 to generate magnetism when energized or to lose magnetism when de-energized.
[0040] In this embodiment: This safety door push rod lock anti-unlocking device is suitable for scenarios such as the driver's cab door, the door between the employee area and the passenger area, etc. When applied to the driver's cab, the safety door panel 1 is the driver's cab safety door. During installation, the lock box 3 is first fixed in the groove 2 of the safety door panel 1. The driver needs to carry a special key 10 that matches the shape of the slot 91 of the lock cylinder 9, the first rotating cylinder 56, and the second rotating cylinder 59. When using it, the key 10 is inserted into the corresponding lock cylinder 9, the first rotating cylinder 56, and the second rotating cylinder 59 and rotated. During the rotation, the convex ring 57 on the outer ring of the first rotating cylinder 56 rotates synchronously. Because the convex ring 57 has an annular groove 58 and is sleeved with the slide rod 52, the convex ring 57 will generate a pushing force on the slide rod 52 through the annular groove 58 when it rotates. Also, because the convex rods 55 on both sides of the slide rod 52 are located on the end of the convex ring 57, the convex ring 57 will contact the convex rods 55 when it rotates, thereby pushing the slide rod 52 to slide along the fixing block 51 into the lock box 3. The sliding of the slide rod 52 causes the lock tongue 54 to retract back into the recess 4, while squeezing the first spring 53. At this time, the lock tongue 54 separates from the cab door frame, and the cab door can be opened.
[0041] After the driver enters the cab, he removes the key 10. Under the elastic force of the spring 53, the latch 54 automatically resets to achieve initial locking. Since the touch button 115 is pre-registered with the corresponding driver's fingerprint, the driver can operate the electromagnet 122 to be energized by touching the touch button 115. After the electromagnet 122 is energized, it generates magnetism. Since the permanent magnet 120 and the electromagnet 122 have opposite magnetic poles, the electromagnet 122 will attract the permanent magnet 120, driving the movable rod 119 to move towards the electromagnet 122, so that the movable rod 119 and the convex rod 55 are tightly fitted to form an integral synchronous moving structure. Then, the safety door panel 1 and the cab door frame are closed by internal control. At this time, the electromagnet 122 remains energized. Even if an outsider tries to insert a tool to replace the key 10 into the lock cylinder 9 or other parts, the friction braking action of the movable rod 119 and the convex rod 55 will prevent the external tool from pushing the slide rod 52 to retract the latch 54, thus effectively preventing the door from opening.
[0042] When the driver needs to exit the cab, pushing the push-pull plate 113 will cause the slide plate 112 to slide along the limit strip 111. During the movement of the slide plate 112, the fixed rod 14, the embedded rod 116, and other components will be moved simultaneously. This will then push the protruding rod 55 through the movable rod 119. The protruding rod 55 will cause the slide rod 52 to slide and compress the first spring 53, causing the latch 54 to retract back into the recess 4 to unlock the door, allowing the driver to exit smoothly. After exiting, the safety door will automatically return to the closed state. When the push-pull plate 113 is released, the slide rod 52 will cause the latch 54 to pop out under the elastic force of the first spring 53. At the same time, the second spring 118 and the third spring 121 will push the movable rod 119 and the permanent magnet 120 to reset, and the door will be fully locked again.
[0043] Example 2:
[0044] This embodiment aims to address the imbalance between passage efficiency and security control in traditional employee-passenger area separation doors. It is an improvement upon Embodiment 1. Specifically, in the door scenario between the employee and passenger areas, the security door push-bar lock anti-unlocking device still provides efficient security isolation. Since the system has pre-registered authorized fingerprint information for employees, when an employee needs to pass, they simply touch the touch button 115 on the door panel with their authorized finger to energize the electromagnet 122. After the electromagnet 122 is energized, it generates… The magnet is generated, quickly attracting the permanent magnet 120 at the corresponding position, driving the movable rod 119 to move towards the electromagnet 122, so that the movable rod 119 and the protruding rod 55 are precisely fitted to form a linkage structure. At this time, the employee pushes the push-pull plate 113, and the sliding plate 112 will slide smoothly along the limit strip 111. Through the transmission of components such as the fixed rod 14 and the embedded rod 116, the movable rod 119 pushes the protruding rod 55 to drive the sliding rod 52 to move into the lock box 3. While the sliding rod 52 compresses the spring 53, it drives the lock tongue 54 to retract back into the recess 4, so that the employee can easily open the door from the employee area side.
[0045] After passage is completed, the employee releases the push-pull plate 113. Under the elastic force of spring 1 53, the slide bar 52 immediately drives the latch 54 to pop out of the notch 4 and re-engage with the door frame latch. At the same time, spring 2 118 and spring 3 121 exert force simultaneously to push the movable rod 119 and the permanent magnet 120 to reset. The electromagnet 122 automatically cuts off the power, and the entire device returns to the initial locked state. The door body accurately returns to the nominal locking position.
[0046] The entire operation does not rely on the emergency key 10, simplifying the passage process for employees. For external passengers, since they have not registered authorized fingerprints, they cannot trigger the touch button 115, and they do not have a dedicated key 10 to open the lock cylinder 9. They cannot unlock the lock from the passenger area side by touching the button 115, nor can they forcibly open it with the key 10 or other tools. This strictly ensures the physical isolation security between the employee area and the passenger area, achieving the dual requirements of convenient passage and security protection.
[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A safety door push rod lock anti-unlocking device, comprising a safety door panel (1), characterized in that: The safety door panel (1) has a groove (2) inside, and a lock box (3) is installed in the groove (2). The lock box (3) has a notch (4) on its side wall. An outer lock assembly (5) and an inner lock assembly (11) are installed in the lock box (3). The outer lock assembly (5) includes a lock tongue (54) that is slidably connected in the notch (4). The safety door panel (1) has a slot (6) on its surface. An installation plate (7) is engaged in the slot (6). A lock frame (8) is installed on the installation plate (7). A lock cylinder (9) is installed on the lock frame (8). A key (10) is engaged in the lock cylinder (9).
2. The anti-unlocking device for a safety door push rod lock according to claim 1, characterized in that: The external lock assembly (5) includes a receiving cavity (31) opened in the lock box (3), a fixing block (51) is fixed in the receiving cavity (31), a slide rod (52) is slidably connected in the fixing block (51), a spring (53) is sleeved on the outer ring of the slide rod (52), and the slide rod (52) is fixedly connected to the lock tongue (54).
3. The anti-unlocking device for a safety door push rod lock according to claim 2, characterized in that: One end of the spring (53) is fixedly connected to the side wall of the fixing block (51), and the other end of the spring (53) is fixedly connected to the side wall of the locking tongue (54).
4. The anti-unlocking device for a safety door push rod lock according to claim 3, characterized in that: The lock box (3) is rotatably connected to a rotating core one (56). A convex ring (57) is fixedly sleeved on the outer ring of the rotating core one (56). An annular groove (58) is opened in the convex ring (57). The convex ring (57) is sleeved with the slide rod (52). A rotating core two (59) is installed inside the connection between the mounting plate (7) and the safety door plate (1). Convex rods (55) are symmetrically fixed on both sides of the slide rod (52). The convex rods (55) are located on the end side of the convex ring (57).
5. The anti-unlocking device for a safety door push rod lock according to claim 4, characterized in that: The first rotating core (56), the second rotating core (59) and the lock core (9) have the same shape, and each of the first rotating core (56), the second rotating core (59) and the lock core (9) has a slot (91) which is adapted to the shape of the key (10).
6. The anti-unlocking device for a safety door push rod lock according to claim 5, characterized in that: The external lock assembly (5) includes a limiting strip (111) fixedly connected to the other side of the safety door panel (1). The limiting strip (111) is symmetrically arranged. A sliding plate (112) is slidably installed on the limiting strip (111). A push-pull plate (113) is fixed to the end of the sliding plate (112). A fixing rod (14) is fixed inside the sliding plate (112). A touch button (115) is installed on the fixing rod (14).
7. The anti-unlocking device for a safety door push rod lock according to claim 6, characterized in that: An embedded rod (116) is fixed inside the fixed rod (14). A cavity (117) is opened inside the embedded rod (116). A movable rod (119) is slidably connected inside the cavity (117). A second spring (118) is fixed to the side wall of the movable rod (119). The other end of the second spring (118) is fixedly connected to the inner wall of the cavity (117).
8. The anti-unlocking device for a safety door push rod lock according to claim 7, characterized in that: A permanent magnet (120) is fixed on the other side of the movable rod (119). A spring three (121) is sleeved on the outer ring of the movable rod (119). One end of the spring three (121) is fixedly connected to the permanent magnet (120), and the other end of the spring three (121) is fixedly connected to the inner rod (116). Two protruding rods (55) are provided. An electromagnet (122) is fixed on the side wall of the end near the permanent magnet (120). The electromagnet (122) is electrically connected to the touch button (115).