A door leaf frame structure and civil air defense door

Abstract

The application provides a door leaf frame structure and a civil air defense door. The door leaf frame structure comprises a door leaf and a door frame matched with the door leaf. The door leaf is provided with a locking mechanism. The locking mechanism comprises at least one driven driving assembly and at least one lock bolt assembly. The driven driving assembly is installed on the door leaf and has a rotatable driving output end. The lock bolt assembly comprises a lock bolt body and a connecting piece. The lock bolt body is movably arranged on the door leaf. The connecting piece is connected to the tail end of the lock bolt body. The driving output end and the connecting piece are coupled through a separable lap joint structure. The application can separate the lock bolt assembly from the transmission system through the separable lap joint structure, can separately control the locked lock bolt in the transverse direction, such as directly pulling, prying or pushing, avoids damage of the driving assembly to cause the lock bolt to be unable to be unlocked, and realizes operability emergency unlocking.

Description

Technical Field

[0001] This invention relates to the field of civil defense equipment technology, specifically to a door frame structure and a civil defense door. Background Technology

[0002] Civil defense doors are crucial protective equipment in modern civil air defense projects. Their core function is to withstand shock waves, isolate toxic agents and radioactive dust during wartime, and provide safe shelter for personnel and materials.

[0003] Currently, traditional air-raid shelter doors generally adopt an integrated locking mechanism. Its typical structure involves a rotating handwheel driving a multi-point transmission shaft. This shaft, through a threaded pair or inclined plane mechanism, directly converts the rotational motion into synchronized lateral linear motion of multiple latches, thereby achieving locking or unlocking. For example, Chinese Patent 202011330119.7 discloses an air-raid shelter door with an assistive structure, including a door structure comprising a first switch, a second switch, a rotary rheostat, a first electric telescopic rod, and a second electric telescopic rod. The door structure also includes an operating body, a door control body, a lock control body, a locking body, and a door body.

[0004] The existing technology has the following problems: when the door is subjected to strong shock wave load and undergoes plastic deformation, the integrated transmission chain will bear and transmit the deformation and stress as a whole. This can easily cause the transmission mechanism itself to twist or jam, or even cause the entire locking system to become completely inoperable due to the damage of a key component, losing the ability to open or close in an emergency. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a door frame structure that solves the technical problem in the prior art where the integrated transmission chain becomes completely inoperable due to the damage of a key component, resulting in the loss of the ability to open or close in an emergency.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a door frame structure, including a door leaf and a door frame that cooperates with the door leaf, wherein the door leaf is provided with a locking mechanism, the locking mechanism comprising: At least one driven drive assembly, mounted on the door leaf and having a rotatable drive output terminal; and At least one latch assembly, the latch assembly including a latch body and a connector, the latch body being laterally movably disposed on the door leaf, the connector being connected to the tail end of the latch body, and the drive output end being coupled to the connector through a detachable overlapping structure; In the coupled state, the overlapping structure can convert the rotational motion of the drive output part into the lateral linear motion of the latch body, driving the latch body to extend or retract; in the separated state, the drive output end is mechanically decoupled from the connector, and the latch body can slide laterally independently.

[0008] In some embodiments, the overlapping structure includes a driving protrusion or driving groove disposed on the driving output end, and a corresponding driven groove or driven protrusion disposed on the connector; the driving protrusion and the driven groove or the driving groove and the driven protrusion are side-fitted when coupled to transmit lateral driving force, and there is a gap in the longitudinal direction to form a longitudinal gap.

[0009] In some embodiments, the drive output terminal of one of the driven components is coupled to the connectors of the two latch components to synchronously drive the two latch bodies to move toward or in opposite directions.

[0010] In some embodiments, the driven assembly includes a rotating seat, a first link, and a second link. The first link is connected to the rotating end of the rotating seat, and the two second links are hinged to the two ends of the first link. The driving protrusion or driving groove is disposed at the end of the second link.

[0011] In some embodiments, the locking mechanism further includes an active drive component mounted on the door leaf and having a mating end that is driveably connected to the driven drive component to transmit rotational driving force.

[0012] In some embodiments, the docking end of one of the active drive components is docked with the drive input ends of the two driven drive components respectively, so as to synchronously drive the two driven drive components to rotate.

[0013] In some embodiments, the active drive assembly includes a drive rod rotatably connected to the door leaf; the rotating seat is provided with a transmission rod, and the end of the drive rod is sleeved with the corresponding transmission rod.

[0014] In some embodiments, the active drive assembly further includes a telescopic limiting member and a limiting rod. The telescopic limiting member has a telescopic limiting end for abutting against one side of the drive rod. The two limiting rods are symmetrically fixed to the door leaf and are respectively used to abut against the other side of the drive rod when the latch body is retracted and when the latch body is extended.

[0015] In some embodiments, the door frame is provided with a lock hole corresponding to the lock tongue body, and the lock hole has a deepened receiving cavity inside, the depth of which is greater than the standard stroke length of the lock tongue body.

[0016] Secondly, the present invention also provides a civil defense door, including the door frame structure as described in any of the above.

[0017] Compared with the prior art, the door frame structure provided by the present invention, through a detachable overlapping structure, allows the latch assembly to be decoupled from the transmission system, enabling lateral manipulation of the jammed latch, such as by directly pulling, prying, or pushing, thus avoiding damage to the drive assembly that would prevent the latch from being unlocked and achieving operable emergency unlocking. The detachable overlapping structure provides an interruption range for impact loads, reducing the probability of damage to the drive assembly and making the latch assembly a relatively independent maintainable unit that can be maintained separately. Attached Figure Description

[0018] Figure 1 This is a three-dimensional diagram of the door frame structure provided in an embodiment of the present invention; Figure 2 This is a front view of the door leaf provided in an embodiment of the present invention; Figure 3 This is a partial schematic diagram of the door frame structure provided in an embodiment of the present invention; Figure 4 This is another partial schematic diagram of the door frame structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the active drive component and telescopic limiting component of the door frame structure provided in the embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Door leaf; 2. Door frame; 201. Keyhole; 202. Receiving cavity; 3. Locking mechanism; 31. Driven assembly; 311. Rotary seat; 312. First connecting rod; 313. Second connecting rod; 314. Transmission rod; 32. Locking tongue assembly; 321. Locking tongue body; 322. Connector; 33. Overlapping structure; 331. Driving protrusion; 332. Driven groove; 333. Neutral space; 34. Active drive assembly; 341. Drive rod; 342. Telescopic limit component; 342a. Protrusion; 342b. Base plate; 342c. Sleeve; 342d. Spring; 342e. Rotary handle; 343. Limit rod; 344. Turntable; 345. Base. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] To address the technical problem that the failure of a single critical component in an integrated transmission chain can render the entire locking system completely inoperable, losing its emergency opening or closing capability, this invention provides a door frame structure that, through a detachable overlapping structure, allows the latch assembly 32 to be disengaged from the transmission system. This enables independent lateral manipulation of the jammed latch, such as by pulling, prying, or pushing, preventing damage to the drive assembly from rendering the latch unable to unlock and achieving operable emergency unlocking. The detachable overlapping structure provides an interruption range for impact loads, reducing the probability of damage to the drive assembly and making the latch assembly a relatively independent maintainable unit that can be maintained separately.

[0022] It should be noted that the door frame structure described in this invention is used in, but not limited to, air defense doors. For ease of explanation, this invention will only use the application of the door frame structure in air defense doors as an example. The principle of the door frame structure applied to other types of equipment is essentially the same as that applied to air defense doors, and will not be elaborated here.

[0023] Please see Figure 1-4 This invention provides a door frame structure, which includes a door leaf 1 and a door frame 2 that cooperates with the door leaf 1. The door leaf 1 is provided with a locking mechanism 3, which includes at least one driven component 31 and at least one latch component 32. The driven component 31 is mounted on the door leaf 1 and has a rotatable drive output end. The latch component 32 includes a latch body 321 that is laterally movable on the door leaf 1 and a connector 322 connected thereto. The drive output end and the connector 322 are coupled through a separable overlapping structure 33. In the coupled state, the overlapping structure 33 can convert the rotational motion of the drive output part into the lateral linear motion of the latch body 321, driving the latch body 321 to extend or retract. In the separated state, the drive output end is mechanically decoupled from the connector 322, and the latch body 321 can slide laterally independently. A pre-set operable disconnect point allows the connection between the drive output and the bolt to be disconnected as needed. Furthermore, the bolt assembly 32 can be independently separated, enabling the inspection, replacement, or repair of a single bolt without disassembling the entire complex and heavy locking transmission system, significantly reducing the difficulty, time, and cost of daily and post-war maintenance.

[0024] Understandably, after separation, the latch becomes an independently sliding component. Rescuers can immediately use tools such as crowbars and hydraulic jacks to directly pull back or push out the latch body, thereby physically releasing the lock.

[0025] In use, the latch assembly 32 is extended and retracted by the driven component 31 to lock and unlock the door leaf 1 and the door frame 2. In cases where the latch assembly 32 needs to be driven separately, such as during maintenance or when the driven component 31 is damaged, the connector 322 can be separated from the drive output end, and then the latch body 321 in the latch assembly 32 can be moved separately.

[0026] In this embodiment, please refer to Figure 2 One driven drive assembly 31 corresponds to two latch assemblies 32. The two latch assemblies 32 are arranged on both sides of the driven drive assembly 31, and are used to extend and retract laterally to form a locking mechanism when inserted into the lock hole and an unlocking mechanism when removed from the lock hole. Since the drive of the latch body 321 is separable, if the driven drive assembly 31 suffers damage to its transmission system and cannot drive the latch body 321, the drive can be separated, and the latch body 321 can be pulled manually or with tools to unlock it. Furthermore, the overlap facilitates the formation of a controllable gap in the main impact direction, without requiring a completely tight connection with the latch body 321. This can be used to interrupt the transmission of impact loads, reduce the impact effect of the latch on the driven drive assembly 31, and reduce the probability of damage.

[0027] It is understandable that one driven component 31 corresponding to two latch components 32 is only a preferred embodiment. When multiple latches need to be driven, four or more pairs of latches can be driven. However, for the sake of reliability and ease of use, it is preferred that one driven component 31 corresponds to two latch components 32.

[0028] In one embodiment, please refer to Figure 2 and Figure 3 The overlapping structure 33 includes a driving protrusion 331 or driving groove disposed on the drive output end, and a corresponding driven groove 332 or driven protrusion disposed on the connector 322. When the driving protrusion 331 and driven groove 332, or the driving groove and driven protrusion, are coupled, they laterally engage to transmit lateral driving force. The lateral engagement of the protrusion and groove is responsible for transmitting working torque, while the longitudinal separation operation only requires overcoming a small amount of friction. When the transmission system is jammed, rescue personnel can apply force specifically to the separation mechanism, such as prying the connector, to dislodge the protrusion from the groove, thus physically separating the latch assembly from the drive system. The separation action does not depend on a damaged transmission chain, resulting in a high success rate. A longitudinal gap 333 exists in the longitudinal direction, allowing the latch assembly to float to a limited extent during impacts or vibrations perpendicular to the door leaf direction, without forcibly transmitting this force to the drive output end.

[0029] It is understandable that whether it is the driving protrusion 331 or the driving groove, or the driven groove 332 or the driven protrusion, as long as a matching and interlocking coupling structure is formed, it is acceptable; no single limitation is made here. The longitudinal gap can effectively absorb the non-axial displacement of the door leaf caused by impact, such as torsion and vibration, and prevent these complex stresses from causing the internal transmission mechanism to jam or be damaged.

[0030] In this preferred embodiment, please refer to... Figure 3 The drive protrusion 331 and the driven groove 332 are structurally matched to facilitate the connection and disconnection. The drive protrusion 331 is rod-shaped, and the driven groove 332 is U-shaped. The drive protrusion 331 rotates from top to bottom and engages with the driven groove 332. During lateral movement, it abuts against the left and right side walls of the driven groove 332, thereby transmitting lateral driving force.

[0031] Understandably, the rod-shaped drive protrusion 331 provides lateral driving force during the horizontal push, and its reciprocating movement can drive the bolt to extend and retract; at this time, the longitudinal gap can avoid direct impact on the connecting rod, which greatly reduces the probability of damage to the driven part.

[0032] Furthermore, the drive output end of one of the driven components 31 is coupled to the connectors 322 of the two latch components 32 to synchronously drive the two latch bodies 321 to move towards or away from each other, so as to uniformly press the sealing strips on both sides and synchronously move the latches on both sides.

[0033] Specifically, the driven assembly 31 includes a rotating base 311, a first connecting rod 312, and a second connecting rod 313. The first connecting rod 312 is connected to the rotating end of the rotating base 311, and the two second connecting rods 313 are hinged to the two ends of the first connecting rod 312 to match the driving of the locking tongues on both sides. Please refer to [link to relevant documentation]. Figure 2 The first link 312 and the second link 313 form a Z-shaped structural layout. The driving protrusion 331 or driving groove is provided at the end of the second link 313. When the first link 312 rotates based on the rotating seat 311, it can push the second links 313 on both sides to move towards or in opposite directions.

[0034] In one embodiment, please refer to Figure 2To synchronize the driving of the upper and lower sets of latches and further simplify the locking operation, the locking mechanism 3 also includes an active drive component 34. The active drive component 34 is mounted on the door leaf 1 and has a mating end that is connected to the driven drive component 31 to transmit rotational driving force. Thus, during operation, the operator only needs to operate the active drive component 34 to drive the driven drive component 31 to synchronously extend or retract the four latches of the upper and lower sets. Specifically, the mating end of one active drive component 34 is respectively connected to the drive input ends of two driven drive components 31 to synchronously drive the two driven drive components 31 to rotate.

[0035] To simplify the structure and facilitate maintenance, the active drive assembly 34 includes a drive rod 341, which is rotatably connected to the door leaf 1. Correspondingly, a transmission rod 314 is provided on the rotating seat 311. The transmission rods 314 on the upper and lower rotating seats 311 are respectively located on both sides of the central axis of the door leaf 1. Furthermore, the end of the drive rod 341 is sleeved with the corresponding transmission rod 314. Under the rotation of the drive rod 341, the upper and lower rotating seats 311 are driven to rotate in the same direction.

[0036] Understandably, the drive mode of drive lever 341 avoids the problem of asynchronous movement of the upper and lower locking tongues caused by belt slippage, gear backlash or independent clutch, and avoids complex gearboxes, additional connecting rods or universal joints, making the structure very simple.

[0037] Furthermore, to limit the opening and closing positions and improve stability, please refer to [link / reference needed]. Figure 2 and Figure 5 The active drive assembly 34 further includes a telescopic limiting member 342 and a limiting rod 343. The telescopic limiting member 342 has a telescopic limiting end for abutting one side of the drive rod 341, centered on the central axis of the door leaf 1. When the drive rod 341 rotates to the left, it abuts against its right side; when it rotates to the right, it abuts against its left side, thus limiting it on one side and preventing it from rotating to the other side, thereby locking it in the open or closed position area. Correspondingly, the extreme rotational positions of both sides of the drive rod 341 are limited. The two limiting rods 343 are symmetrically fixed to the door leaf 1, respectively abutting against the other side of the drive rod 341 when the latch body 321 is retracted and when the latch body 321 is extended, and correspondingly against the other side of the drive rod 341. This can actively lock the door leaf in the open or closed state, preventing accidental movement of the door leaf due to vibration, changes in internal air pressure, or accidental contact with the handwheel. It helps maintain the airtightness of the shelter or ensures unobstructed evacuation routes. It also prevents damage to internal parts caused by overtravel of the mechanism.

[0038] Understandably, in an explosive impact environment, the door and mechanism may vibrate violently. The single-sided locking of the telescopic limiter allows the shock wave to push the drive rod from the locked side. At this time, the limit end bears the pressure, making it more stable, but it can effectively prevent it from loosening to the other side, ensuring the passive safety of the door in harsh environments.

[0039] Please refer to Figure 5 To facilitate rotation drive and synchronous control of the extension and retraction of the telescopic limit component 342, and to improve operational convenience, Furthermore, the active drive assembly 34 also includes a turntable 344 and a base 345. The base is mounted on the door leaf, the turntable is rotatably connected to the base, and the drive rod 341 is fixed on the shaft of the turntable. The drive rod 341 can be rotated by rotating the turntable, which facilitates manual operation of the drive rod 341. Correspondingly, the telescopic limiting component 342 includes a protrusion 342a, a base plate 342b, a sleeve 342c, a spring 342d, and a handle 342e. Two protrusions 342a are fixedly connected to the top of both ends of the base plate and extend through the base to the outside. The sleeve 342c is rotatably connected to the base plate 342b and has a sliding support on the outer edge of the bottom of the base plate 342b. The spring 342d is built between the sleeve 342c and the base 345 to elastically support the base plate 342b and the sleeve 342c, so that the tops of the sleeve 342c and the protrusions 342a extend to the outside of the base 345. The handle 342e is fixed to the top of the sleeve 342c. The sleeve 342c is coaxial with the turntable 344 and is located at the axial center of the turntable 344. The turntable 344 has a through hole for the sleeve to pass through. The handle 342e matches the outer edge of the turntable 344. During operation, the handle 342e is pressed down and fits against the turntable 344. The handle 342e and the turntable 344 can be gripped at the same time and rotated. At this time, due to the downward pressure of the handle, the sleeve and the base plate are pressed down, causing the protrusion to retract and release the limit.

[0040] In use, pressing down the handle 342e will bring it into contact with the turntable 344, allowing you to hold both the handle 342e and the turntable 344 simultaneously. At this time, the downward pressure of the handle 342e also simultaneously presses down the sleeve 342c, the base plate 342b, and the protrusion 342a, causing the protrusion 342a, which acts as a limit and abuts against the drive rod 341, to retract and release its limit on the drive rod 341. Conversely, when the handle 342e is released, the spring 342d will return the handle 342e, the protrusion 342a, the base plate 342b, and the sleeve 342c to their original positions.

[0041] Understandably, the operator naturally grips the handle with one hand, and pressing down automatically releases the limit switch. Continuing to rotate the same component drives the turntable, forming a seamless, continuous action. The limit switch protrusion extends and is held in place by spring force. To unlock, the operator must actively press down and overcome the spring force, effectively preventing accidental unlocking due to collisions or vibrations, ensuring the safety of the door. The handle and turntable are coaxial and interlocked. When the operator presses down on the handle, their hand is aligned and fixed with the center of rotation. This avoids the risk of injury from the surrounding frame caused by sudden rotation or slippage of the mechanism when rotating on an independent handwheel, as is common in traditional designs. The operating force is always applied to the correct position.

[0042] In one embodiment, please refer to Figure 1 The latch body 21 is slidably connected to the door leaf 1 via a guide sleeve installed on the door leaf 1. In order to prevent the latch from bending and sliding within the guide sleeve, the door frame 2 is provided with a lock hole 201 corresponding to the latch body 321. The lock hole 201 has a deepened receiving cavity 202 inside. The depth of the receiving cavity 202 is greater than the standard stroke length of the latch body 321. Rotating the drive protrusion 331 disengages it from the driven groove 332, releasing the restriction on the latch body 321. It can then move towards the lock hole 201 and insert into the lock hole 201, thereby disengaging from the door leaf 1, unlocking the door, and allowing the door to be opened as an emergency measure.

[0043] Please refer to Figure 3 The driving protrusion 331 is rod-shaped, and the driven groove 332 is U-shaped. Notches are provided on both sides and the top of the end away from the lock hole, so that the size of the corresponding side of the driven groove 332 is smaller than the lock hole, so that the tool can be hooked when inserted into the lock hole.

[0044] The present invention also provides a civil defense door, including a door leaf frame structure as described in any of the above embodiments, wherein a sealing structure is provided between the door leaf and the door frame.

[0045] To better understand this invention, the following is combined with... Figures 1 to 5The technical solution of the present invention is described in detail as follows: In use, pressing down the handle 342e causes it to adhere to the turntable 344, allowing simultaneous gripping of both the handle 342e and the turntable 344. Simultaneously, the pressing down of the handle 342e also presses down the sleeve 342c, the base plate 342b, and the protrusion 342a, causing the protrusion 342a, which acts as a limit and abuts against the drive rod 341, to retract, releasing the limit on the drive rod 341. Rotating the turntable 344 drives the drive rod 341 to rotate, which in turn pushes against the transmission rod 314, causing the rotating end of the rotating seat 311 to rotate, thus driving the second connecting rod 313 to rotate; causing the first connecting rods 312 on both sides to rotate simultaneously. The step drives the corresponding side of the latch body 321 to extend and retract; when it is necessary to unlock the connection between the connector 322 of the latch body 321 and the driven component 31, the second link 313 is rotated to disengage the drive protrusion 331 from the driven groove 332, which can independently control the jammed latch laterally, such as by pulling, prying or pushing, to avoid damage to the drive component that would prevent the latch from being unlocked, thus achieving operable emergency unlocking; if the latch is twisted and cannot be retracted in one direction, but can be moved toward the keyhole 201, the latch can be directly pushed into the receiving cavity 202 in the keyhole 201 to achieve the unlocking effect, and then the latch can be pulled out with a tool.

[0046] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A door frame structure, comprising a door leaf and a door frame that cooperates with the door leaf, wherein the door leaf is provided with a locking mechanism, characterized in that, The locking mechanism includes: At least one driven drive assembly, mounted on the door leaf and having a rotatable drive output terminal; and At least one latch assembly, the latch assembly including a latch body and a connector, the latch body being laterally movably disposed on the door leaf, the connector being connected to the tail end of the latch body, and the drive output end being coupled to the connector through a detachable overlapping structure; In the coupled state, the overlapping structure can convert the rotational motion of the drive output part into the lateral linear motion of the latch body, driving the latch body to extend or retract; in the separated state, the drive output end is mechanically decoupled from the connector, and the latch body can slide laterally independently.

2. The door frame structure according to claim 1, characterized in that, The overlapping structure includes a driving protrusion or driving groove disposed on the driving output end, and a corresponding driven groove or driven protrusion disposed on the connector; when the driving protrusion and the driven groove or the driving groove and the driven protrusion are coupled, they are side-fitted to transmit lateral driving force, and there is a gap in the longitudinal direction to form a longitudinal gap.

3. The door frame structure according to claim 2, characterized in that, The drive output terminal of one of the driven components is coupled to the connector of each of the two latch components to synchronously drive the two latch bodies to move toward or in opposite directions.

4. The door frame structure according to claim 3, characterized in that, The driven assembly includes a rotating seat, a first connecting rod, and a second connecting rod. The first connecting rod is connected to the rotating end of the rotating seat, and the two second connecting rods are hinged to the two ends of the first connecting rod. The driving protrusion or driving groove is disposed at the end of the second connecting rod.

5. The door frame structure according to claim 4, characterized in that, The locking mechanism also includes an active drive component, which is mounted on the door leaf and has a mating end that is connected to the driven drive component to transmit rotational driving force.

6. The door frame structure according to claim 5, characterized in that, One of the active drive components is connected to the drive input terminals of the two driven drive components respectively, so as to synchronously drive the two driven drive components to rotate.

7. The door frame structure according to claim 6, characterized in that, The active drive assembly includes a drive rod rotatably connected to the door leaf; the rotating seat is provided with a transmission rod, and the end of the drive rod is sleeved with the corresponding transmission rod.

8. The door frame structure according to claim 7, characterized in that, The active drive assembly also includes a telescopic limiting member and a limiting rod. The telescopic limiting member has a telescopic limiting end for abutting against one side of the drive rod. The two limiting rods are symmetrically fixed to the door leaf and are respectively used to abut against the other side of the drive rod when the latch body is retracted and when the latch body is extended.

9. The door frame structure according to claim 1, characterized in that, The door frame is provided with a lock hole corresponding to the lock tongue body, and the lock hole has a deepened receiving cavity inside, the depth of which is greater than the standard stroke length of the lock tongue body.

10. A type of air-raid shelter door, characterized in that, Includes the door frame structure as described in any one of claims 1-9.

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