A lock tongue retracting mechanism and a ceiling screen with the same

Abstract

This utility model discloses a latch extension mechanism, including a traveling mechanism. The traveling mechanism includes a first traveling mechanism, which comprises a first electromagnetic drive, a first elastic connector, and a latch. The first electromagnetic drive and the latch are connected by the first elastic connector. When the first electromagnetic drive is slowly energized, it drives the latch to smoothly retract to a first position along a first direction. When the first electromagnetic drive is slowly de-energized, the first elastic connector drives the latch to smoothly extend to a second position along the first direction. This utility model achieves contactless transmission by driving the latch with slowly changing electromagnetic force, significantly reducing abnormal noise and squeaks during operation. Furthermore, the second and third traveling mechanisms provide stable limits for the latch during extension and retraction, enhancing the stability and reliability of the mechanism and reducing abnormal situations such as shaking and jamming.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a latch telescopic mechanism and a ceiling screen having the same. Background Technology

[0002] With the development of automotive intelligence, the entertainment attributes of cars as a third space are increasing, and ceiling-mounted screens, as rear-seat entertainment displays, are gradually becoming popular in automobiles. Ceiling-mounted screens are displays installed inside the vehicle, usually located on the ceiling, capable of playing multimedia content such as videos and music, providing passengers with entertainment and information inquiry functions. In some high-end models, the ceiling-mounted screens can also connect to the vehicle's intelligent system, enabling multi-screen interaction, navigation, and other functions.

[0003] Ceiling-mounted screens are equipped with a locking tongue mechanism. Users can electrically control the screen to open or close. When the screen is closed, the locking tongue needs to extend to secure it and prevent abnormal opening. The screen can only open normally when the locking tongue retracts. Currently, most ceiling-mounted screens on the market use a brushed motor to drive the locking tongue, which not only has problems such as high cost and noise, but also poor control synchronization, making it prone to shaking and jamming during use.

[0004] Therefore, it is necessary to design a latch telescopic mechanism and its ceiling screen that can reduce noise and improve stability. Utility Model Content

[0005] In order to overcome the technical problems of high noise and poor stability of the traditional ceiling screen locking tongue mechanism described in the prior art, this utility model provides a locking tongue telescopic mechanism and a ceiling screen having the same.

[0006] The technical solution adopted by this utility model to solve its problem is: A latch extension mechanism includes a traveling mechanism, which includes a first traveling mechanism. The first traveling mechanism includes a first electromagnetic drive, a first elastic connector, and a latch. The first electromagnetic drive and the latch are connected by the first elastic connector. When the first electromagnetic drive is energized, it can drive the latch to compress the first elastic connector along a first direction and smoothly retract to a first position. When the first electromagnetic drive is de-energized, the first elastic connector can drive the latch to smoothly extend to a second position along the first direction.

[0007] As a preferred embodiment, during the power-on process of the first electromagnetic drive, its current gradually increases from zero to a non-zero set value within a first preset time period, so that the latch smoothly retracts to the first position along the first direction; during the power-off process of the first electromagnetic drive, its current gradually decreases from the non-zero set value to zero within a second preset time period, so that the latch smoothly extends to the second position along the first direction; the magnitudes of the first preset time and the second preset time are equal or unequal.

[0008] As a preferred embodiment, the traveling mechanism further includes a second traveling mechanism, the second traveling mechanism including a first fixed post capable of reciprocating and extending along a second direction perpendicular to the first direction; the latch is provided with a first slot and a second slot at intervals on the side facing the second traveling mechanism; wherein, when the latch is in the first position, the end of the first fixed post extends into the first slot; when the latch is in the second position, the end of the first fixed post extends into the second slot.

[0009] As a preferred embodiment, the traveling mechanism further includes a third traveling mechanism, which includes a second fixed post capable of reciprocating and extending along a third direction perpendicular to the first direction; the latch is provided with a third slot and a fourth slot on the side facing the third traveling mechanism; wherein, when the latch is in the first position, the end of the first fixed post extends into the third slot; when the latch is in the second position, the end of the first fixed post extends into the fourth slot.

[0010] As a preferred embodiment, the second traveling mechanism and the third traveling mechanism are located on opposite sides of the locking tongue, with the second direction and the third direction being the same.

[0011] As a preferred embodiment, the second traveling mechanism includes a second electromagnetic drive and a second elastic connector, wherein the second electromagnetic drive and the first fixed post are connected by the second elastic connector; wherein, when the second electromagnetic drive is powered on, the second electromagnetic drive can drive the first fixed post to compress the second elastic connector along the second direction and smoothly retract to the third position; when the second electromagnetic drive is powered off, the second elastic connector can drive the first fixed post to smoothly extend to the fourth position along the second direction.

[0012] As a preferred embodiment, the third traveling mechanism includes a third electromagnetic drive and a third elastic connector, wherein the third electromagnetic drive and the second fixed post are connected by the third elastic connector; wherein, when the third electromagnetic drive is powered on, the third electromagnetic drive can drive the second fixed post to compress the third elastic connector along the third direction and smoothly retract to the fifth position; when the third electromagnetic drive is powered off, the third elastic connector can drive the second fixed post to smoothly extend to the sixth position along the third direction.

[0013] As a preferred embodiment, the first, second, and third electromagnetic drive components all include electromagnetic elements. Each electromagnetic element includes a yoke, an iron core, a bobbin, a coil, a top cover, and a housing. The iron core is fixedly disposed within a through hole in the yoke. The bobbin is disposed outside the iron core, and its outer wall has a winding groove. The coil is tightly wound within the winding groove. The top cover is disposed at the open end of the yoke to encapsulate the iron core, the bobbin, and the coil within the yoke. The housing is fixedly installed on the outside of the top cover, and the first, second, and third elastic connectors are respectively connected to their corresponding housings.

[0014] As a preferred embodiment, the latch extension mechanism further includes an MCU and a first power supply, a second power supply, and a third power supply electrically connected to the MCU. The first power supply is electrically connected to the first electromagnetic drive, the second power supply is electrically connected to the second electromagnetic drive, and the third power supply is electrically connected to the third electromagnetic drive.

[0015] Based on the same design concept, this utility model also provides a ceiling screen including the above-described latch telescopic mechanism. The ceiling screen also includes a rotatable display screen, which has a fifth slot. When the display screen is closed, the latch extends to a second position along a first direction and engages with the fifth slot. When the display screen is open, the latch retracts to a first position along a first direction.

[0016] In summary, the latch telescopic mechanism and the ceiling screen with it provided by this utility model have at least the following technical advantages compared with the prior art: 1) The electromagnetic drive components of each traveling mechanism drive the locking tongue or fixed column to travel by electromagnetic force, realizing contactless transmission, avoiding the mechanical friction caused by traditional multi-motor drive, greatly reducing abnormal noise and noise during travel and improving quietness.

[0017] 2) The first fixed post of the second traveling mechanism and the second fixed post of the third traveling mechanism are precisely engaged with the slots on both sides of the locking tongue under the control of the MCU. This can form a stable limit on the locking tongue during its extension and retraction, effectively preventing the locking tongue from shaking, enhancing the stability and reliability of the mechanism operation, and reducing the occurrence of abnormal situations such as shaking and jamming.

[0018] 3) The traveling mechanism controls the attraction force of each electromagnetic drive component by slowly increasing or decreasing the current (or slowly energizing and slowly de-energizing), which can flexibly adjust the running speed of the locking tongue or the two fixed columns, ensuring that the locking tongue moves slowly and smoothly, reducing the impact and wear during the movement, helping to extend the service life of the mechanism, and improving the smoothness of operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the locking tongue telescopic mechanism of this utility model; Figure 2 This is a schematic diagram of the structure of the first traveling mechanism of this utility model; Figure 3 This is a schematic diagram of the structure of the electromagnetic drive component of this utility model; Figure 4 This is a schematic diagram of the hardware module of the latch telescopic mechanism of this utility model; The meanings of the reference numerals in the attached figures are as follows: 1. First traveling mechanism; 11. First electromagnetic drive component; 12. First elastic connector; 13. Locking tongue; 131. First slot; 132. Second slot; 133. Third slot; 134. Fourth slot; 2. Second traveling mechanism; 21. Second electromagnetic drive component; 22. Second elastic connector; 23. First fixed column; 3. Second traveling mechanism; 31. Third electromagnetic drive component; 32. Third elastic connector; 33. Second fixed column; 4. MCU; 41. First power supply; 42. Second power supply; 43. Third power supply; 5. Electromagnetic components; 51. Yoke; 52. Iron core; 53. Bollard; 54. Coil; 55. Top cover; 56. Cover. Detailed Implementation

[0020] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation 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.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0023] See Figure 1 and Figure 2 As shown, in the technical solution of this utility model, the latch telescopic mechanism includes a traveling mechanism, which includes a first traveling mechanism 1. The first traveling mechanism 1 includes a first electromagnetic drive 11, a first elastic connector 12, and a latch 13. The first electromagnetic drive 11 and the latch 13 are connected by the first elastic connector 12. Preferably, the first elastic connector 12 adopts a spring structure. Based on the above structural design, the latch telescopic mechanism realizes the telescopic movement of the latch 13 around the energizing and de-energizing state of the first electromagnetic drive 11, as follows: 1) Initial state: The first elastic connector 12 is not compressed, and the locking tongue 13 is held in the second position extending in the first direction under the action of the first elastic connector 12 (i.e. the extended state of the locking tongue 13).

[0024] 2) Locking tongue 13 retraction process: When the first electromagnetic drive 11 is powered on (the power-on process is preferably a slow power-on process), it generates a slowly increasing electromagnetic force. This force overcomes the elastic force of the first elastic connector 12 and drives the locking tongue 13 to retract slowly and smoothly in the first direction through the first elastic connector 12 until the locking tongue 13 reaches the first position (i.e., the retracted state). At this time, the first elastic connector 12 is compressed and stores elastic potential energy.

[0025] 3) Locking tongue 13 extension process: When the first electromagnetic drive 11 is powered down (the power-down process is preferably a slow power-down process), the electromagnetic force slowly decreases until it disappears. The compressed first elastic connector 12 releases elastic potential energy and generates a reset thrust. This reset thrust overcomes the electromagnetic force, thereby driving the locking tongue 13 to extend slowly and smoothly along the first direction, from the first position to the second position, and return to the initial extended state.

[0026] In the above scheme, the first electromagnetic drive component 11 serves as the power source for the first traveling mechanism 1. Utilizing the principle of electromagnetic induction, it generates a directional and slowly increasing electromagnetic force during the slow power-up process, achieving the active and smooth retraction of the latch 13. During the slow power-down process, it gradually reduces the electromagnetic force until it completely disappears, achieving the active and smooth extension of the latch 13. The first elastic connector 12 has dual functions of "force transmission" and "energy storage and reset". During the retraction phase of the latch 13, it acts as a force transmission medium, transmitting the electromagnetic force to the latch 13 and simultaneously being compressed and storing energy. During the extension phase of the latch 13, it acts as a passive power source, driving the latch 13 to reset by releasing the stored elastic potential energy, thus completing the extension action without additional power.

[0027] More specifically, in this embodiment, the first direction is the trajectory direction of the extension and retraction of the latch 13 (not a single direction). The first position (retracted state) and the second position (extended state) correspond to the two working states of the latch 13, respectively. The precise switching between the two states is achieved through the combination of electromagnetic drive and elastic reset.

[0028] Based on this, the latch telescopic mechanism of this utility model adopts electromagnetic drive to achieve contactless power transmission, avoiding the friction and collision of mechanical components such as gears and connecting rods in traditional brushed motor drives. This significantly reduces the operating noise during the extension and retraction of the latch 13, improving quietness. Furthermore, by replacing the traditional multi-motor drive scheme with a combination design of "electromagnetic drive + elastic reset," the number of drive components can be reduced, the overall structure simplified, and production and assembly costs lowered. In addition, the reset function of the first elastic connector 12 has mechanical self-recovery characteristics. Even if the electromagnetic drive fails momentarily, the elastic force can still ensure the stable extension of the latch 13, improving the fault tolerance and operational reliability of the latch telescopic mechanism.

[0029] Furthermore, in actual use, the electromagnetic force intensity can be controlled by adjusting the current of the first electromagnetic drive component 11, and the retraction and extension speed of the locking tongue 13 can be precisely controlled by the slow rise or slow fall current of the traveling mechanism, so as to avoid impact, jamming or shaking caused by excessively fast movement and achieve smooth operation.

[0030] In a preferred embodiment, during the power-on process of the first electromagnetic drive unit 11, its current gradually increases from zero to a non-zero set value within a first preset time (i.e., slow power-on). This slow power-on process generates a gradually increasing electromagnetic force, causing the latch 13 to smoothly retract to the first position along the first direction. During the power-off process of the first electromagnetic drive unit 11, its current gradually decreases from the non-zero set value to zero within a second preset time (i.e., slow power-off). This slow power-off process gradually reduces the electromagnetic force until it completely disappears, causing the latch 13 to smoothly extend to the second position along the first direction. Based on this design, the impact, jamming, or vibration caused by excessively rapid movement of the latch 13 can be avoided, achieving smooth operation.

[0031] The non-zero setting value is preferably 0.2A-5A (the specific setting value is determined according to the motor model; the more turns the electromagnet has, the greater the resistance, and the smaller the non-zero setting value). Specifically, the first preset time and the second preset time can be set to 0.5-5S, preferably around 1S. It should be noted that the above-mentioned first preset time and second preset time can be achieved in the following ways (but not limited to the following methods): 1. DC output current control rate of change (linear adjustment method): For example, by using a linear regulator, programmable current source or power circuit with feedback, the output current of the DC power supply is controlled to slowly rise (power on) or fall (power off) according to a preset slope.

[0032] 2. PWM control duty cycle (switching adjustment method): For example, PWM controls the average output current by adjusting the duty cycle (the proportion of high-level time). If the duty cycle is changed slowly (such as gradually increasing from 0% to 100% to achieve power-on, and gradually decreasing from 100% to 0% to achieve power-off), the power-on and power-off can be achieved slowly.

[0033] 3. RL charge / discharge circuit (passive / semi-passive regulation method): For example, an inductor and a resistor are connected in series between the power supply and the load. By selecting appropriate L and R values, the current rise time is extended. A freewheeling diode is connected in parallel across the inductor to ensure that the current is slowly released through the diode after the power is turned off, thus achieving slow power-down.

[0034] Furthermore, the magnitudes of the first and second preset times can be set according to specific needs; they can be equal or unequal.

[0035] Example 1 In one embodiment of this utility model, a specific structural design scheme for the second traveling mechanism 2 is provided.

[0036] See Figure 1 and Figure 2 As shown, in this embodiment, the traveling mechanism further includes a second traveling mechanism 2. The second traveling mechanism 2 includes a first fixed post 23 capable of reciprocating and extending along a second direction perpendicular to the first direction. The locking tongue 13 has a first slot 131 and a second slot 132 on the side facing the second traveling mechanism 2. When the locking tongue 13 is in the first position, the end of the first fixed post 23 extends into the first slot 131; when the locking tongue 13 is in the second position, the end of the first fixed post 23 extends into the second slot 132.

[0037] In the above scheme, the working process of the second traveling mechanism 2 is coordinated with the extension and retraction of the latch 13, and the extension and retraction of the first fixed post 23 achieves dynamic limiting of the latch 13. Specifically, when the latch 13 is about to extend or retract along the first direction, the first fixed post 23 first retracts to its initial position along the second direction, separating from the first slot 131 of the latch 13, avoiding interference with the movement of the latch 13, and ensuring that the latch 13 can move freely along the first direction. When the latch 13 moves to the target position (i.e., the first position and the second position) along the first direction under the drive of the first traveling mechanism 1, the first fixed post 23 extends towards the latch 13 along the second direction, and its end is precisely embedded in the first slot 131 or the second slot 132 of the latch 13, forming a mechanical limit. When the latch 13 needs to move again along the first direction from its current position (such as switching from the first position to the second position, or vice versa), the first fixing post 23 first retracts along the second direction, releasing the engagement with the first slot 131 or the second slot 132, freeing up space for the next movement of the latch 13, and then repeats the above engagement process.

[0038] Based on the above structural design, the locking tongue 13 can be stably constrained by the "vertical mechanical limit" of the second traveling mechanism 2. The movement direction (second direction) of the first fixed post 23 is perpendicular to the extension and retraction direction (first direction) of the locking tongue 13. This spatial perpendicular relationship allows the first fixed post 23 to apply constraint from the side (non-movement direction) of the locking tongue 13, avoiding interference with the main movement direction of the locking tongue 13. Furthermore, the first slot 131 and the second slot 132 of the locking tongue 13 are designed to fit the first fixed post 23. Their shape and size match the end of the first fixed post 23. When the fixed post extends into the slot, the two form a tight mechanical fit, which can limit the displacement of the locking tongue 13 in the second direction (such as lateral or longitudinal swaying). Finally, the second traveling mechanism 2, through timing coordination with the first traveling mechanism 1, releases the constraint when the locking tongue 13 needs to move freely and applies a limit when stability is required, realizing a precise switch between "dynamic release and static constraint".

[0039] Therefore, by designing the second traveling mechanism 2, the engagement of the first fixed post 23 with the first slot 131 and the second slot 132 can limit the offset of the latch 13 perpendicular to the extension direction, preventing the latch 13 from shaking due to vibration or external force interference during extension, retraction, or when it is stationary at a certain position. This ensures the stability of the latch 13's movement trajectory and reduces problems such as jamming and abnormal noise caused by vibration. In addition, the passive limiting of the latch 13 is achieved through a mechanical structure (the engagement between the first fixed post 23 and the first slot 131 or the first fixed post 23 and the second slot 132). This eliminates the need for complex sensors to monitor the latch 13's posture in real time; stable constraint can be achieved simply by controlling the extension and retraction of the first fixed post 23 in a timing sequence, reducing the design difficulty and cost of the control system.

[0040] More specifically, the two spaced-apart first slots 131 and second slots 132 cooperate with the first fixed post 23. The core principle is to achieve precise constraint of the locking tongue 13 in two extreme states through position-specific limiting. The specific working process is as follows: 1) When the latch 13 is in the second position (extended state), the latch 13 remains extended under the action of the first elastic connector 12, the first fixing post 23 extends along the second direction, and its end is precisely embedded in the second slot 132 of the latch 13, forming a lateral constraint on the latch 13 and preventing the latch 13 from shaking due to vibration or external force in the second position.

[0041] 2) When the latch 13 moves from the second position to the first position, before the first electromagnetic drive 11 electrically drives the latch 13 to retract along the first direction, the first fixing post 23 first retracts along the second direction, separating from the currently embedded second slot 132, releasing the constraint on the latch 13, and ensuring that the latch 13 can move smoothly along the first direction. When the latch 13 is fully retracted to the first position, the first fixing post 23 extends again along the second direction, and its end is embedded in the first slot 131 of the latch 13, completing the limitation of the latch 13 in the first position.

[0042] 3) When the latch 13 moves from the first position to the second position, before the first electromagnetic drive 11 is energized and the first elastic connector 12 drives the latch 13 to extend along the first direction, the first fixing post 23 first retracts along the second direction and disengages from the first slot 131. After the latch 13 is fully extended to the second position, the first fixing post 23 extends again and embeds into the second slot 132, restoring the constraint on the latch 13 in the second position.

[0043] In the above solution, the first slot 131 and the second slot 132 correspond to the two extreme positions of the latch 13, enabling the first fixing post 23 to provide specific positional constraints in each working state of the latch 13. This avoids the "ambiguity in limit position" problem that may be caused by a single slot, ensuring that the latch 13 can be accurately positioned in both retracted and extended states, reducing positional offset errors. Furthermore, the spacing design of the first slot 131 and the second slot 132 can be flexibly adjusted according to the actual stroke of the latch 13, adapting to latch 13 structures of different lengths and extension requirements, thus improving the versatility of this solution in various ceiling-mounted screen latch extension mechanisms.

[0044] See Figure 1As shown, in a preferred embodiment, the second traveling mechanism 2 includes a second electromagnetic drive 21 and a second elastic connector 22, with the second electromagnetic drive 21 and the first fixed post 23 connected by the second elastic connector 22. When the second electromagnetic drive 21 is energized, it drives the first fixed post 23 to compress the second elastic connector 22 along a second direction and smoothly retract to a third position. When the second electromagnetic drive 21 is de-energized, the second elastic connector 22 drives the first fixed post 23 to smoothly extend to a fourth position along the second direction.

[0045] The working process of the second traveling mechanism 2 revolves around the energizing and de-energizing state of the second electromagnetic drive component 21, and achieves the reciprocating extension and retraction of the first fixed column 23 through the synergistic action of the second elastic connector 22. The specific working process is as follows: 1) Initial state: The second elastic connector 22 is not compressed, and the first fixing post 23 is held in the fourth position (i.e., the limiting state of being engaged with the first slot 131 or the second slot 132) under the action of the second elastic connector 22. At this time, the end of the first fixing post 23 is embedded in the corresponding slot, forming a stable constraint on the locking tongue 13.

[0046] 2) Retraction process of the first fixed post 23: When it is necessary to release the limit on the locking tongue 13 (for example, when the locking tongue 13 is about to move in the first direction), the second electromagnetic drive 21 (preferably a slow power-on process) generates a slowly increasing electromagnetic force. This force overcomes the elastic force of the second elastic connector 22 and drives the first fixed post 23 to move slowly and smoothly in the retraction direction in the second direction through the second elastic connector 22 until the first fixed post 23 reaches the third position (i.e., the state of being completely separated from the first slot 131 or the second slot 132). At this time, the second elastic connector 22 is compressed and stores elastic potential energy to prepare for subsequent reset.

[0047] 3) Extension process of the first fixed post 23: When the latch 13 moves to the target position (first position or second position) along the first direction and needs to be re-limited, when the second electromagnetic drive 21 is energized (the energizing process is preferably a slow energizing process), the electromagnetic force slowly decreases until it disappears, the compressed second elastic connector 22 releases elastic potential energy and generates a reset thrust. This reset thrust overcomes the electromagnetic force, thereby driving the first fixed post 23 to move in the opposite direction along the second direction, extending from the third position to the fourth position. The end of the first fixed post 23 is once again accurately embedded in the first slot 131 or the second slot 132 corresponding to the latch 13, restoring the limiting constraint on the latch 13.

[0048] In the above scheme, the second electromagnetic drive component 21 serves as the power source for the second traveling mechanism 2. Utilizing the principle of electromagnetic induction, it generates a directional and slowly increasing electromagnetic force during the slow energization process, enabling the first fixed column 23 to actively and smoothly retract, thus creating space for the reciprocating motion of the latch 13. During the slow de-energization process, the electromagnetic force is gradually reduced until it completely disappears, enabling the latch 13 to actively and smoothly extend, thereby locking the latch 13. Therefore, the use of the second electromagnetic drive component 21 achieves contactless power transmission, avoiding the friction and collision of traditional mechanical drives (such as gears and connecting rods). Combined with the flexible transmission of the elastic connector, this significantly reduces the operating noise during the extension and retraction of the first fixed column 23, and together with the first traveling mechanism 1, improves the overall quietness of the latch extension and retraction mechanism.

[0049] See Figure 3 As shown, in a preferred embodiment, both the first electromagnetic drive unit 11 and the second electromagnetic drive unit 21 include an electromagnetic element 5. The electromagnetic element 5 includes a yoke 51, an iron core 52, a bobbin 53, a coil 54, a top cover 55, and a housing 56. The iron core 52 is fixedly disposed within the through hole of the yoke 51. The bobbin 53 is disposed outside the iron core 52, and its outer wall has a winding groove. The coil 54 is tightly wound within the winding groove. The top cover 55 is disposed at the open end of the yoke 51 to encapsulate the iron core 52, bobbin 53, and coil 54 within the yoke 51. The housing 56 is fixedly installed on the outside of the top cover 55, and the first elastic connector 12 or the second elastic connector 22 is connected to its respective corresponding housing 56.

[0050] In the above technical solution, the electromagnetic elements 5 of the first electromagnetic drive unit 11 and the second electromagnetic drive unit 21 operate in the same way, both transmitting force through the electromagnetic effect generated during the slow energization and de-energization of the coil 54. The specific working process is as follows: 1) Power-on (slow power-on) working stage: When coil 54 is slowly powered on, a magnetic field is generated around coil 54, and the magnetic lines of force form a closed magnetic circuit through iron core 52 and yoke 51 (preferably U-shaped structure). At this time, a slowly changing electromagnetic attraction is generated between iron core 52 and yoke 51. This attraction causes the first elastic connector 12 or the second elastic connector 22 connected to cover 56 to deform. For the first electromagnetic drive 11, this process drives the locking tongue 13 to retract smoothly and slowly along the first direction and compress the first elastic connector 12. For the second electromagnetic drive 21, this process drives the first fixing post 23 to retract smoothly and slowly along the second direction and compress the second elastic connector 22.

[0051] 2) Power-off (slow power-off) reset phase: When coil 54 is slowly powered off, the magnetic field gradually decreases until it disappears, the electromagnetic attraction decreases until it is released, and the compressed first elastic connector 12 or second elastic connector 22 releases its elastic potential energy, achieving reset. For the first electromagnetic drive 11, the elastic force drives the locking tongue 13 to extend smoothly and slowly along the first direction. For the second electromagnetic drive 21, the elastic force drives the first fixed post 23 to extend smoothly and slowly along the second direction, completing the reset action.

[0052] 3) Continuous working cycle: Through the alternating energization of coil 54, electromagnetic element 5 continuously generates a cycle of "electromagnetic attraction driving retraction - elastic force driving extension", providing a stable power source for the first traveling mechanism 1 and the second traveling mechanism 2.

[0053] Based on this, the components of electromagnetic element 5 (yoke 51, iron core 52, spool 53, coil 54, top cover 55, and housing 56) adopt an integrated design, resulting in a compact overall size. This makes it particularly suitable for installation scenarios involving the telescopic latch mechanism of ceiling-mounted screens, solving the problem of large space occupation associated with traditional multi-motor drive devices. Furthermore, the electromagnetic drive is a contactless power transmission (through magnetic force rather than mechanical friction), which, combined with the flexible transmission of the first elastic connector 12 or the second elastic connector 22, significantly reduces mechanical noise during operation, lowers the wear rate, and further enhances the durability of the telescopic latch mechanism.

[0054] Example 2 In another embodiment of this utility model, a specific structural design scheme for the third traveling mechanism 3 is provided.

[0055] See Figure 1 and Figure 2 As shown, in this embodiment, the latch telescopic mechanism further includes a third traveling mechanism 3. The third traveling mechanism 3 is located on the side of the latch 13 away from the second traveling mechanism 2. The third traveling mechanism 3 includes a second fixed post 33 capable of reciprocating telescopic movement in a third direction. The latch 13 is provided with a third slot 133 and a fourth slot 134 on the side facing the third traveling mechanism 3. When the latch 13 is in the first position, the end of the second fixed post 33 extends into the third slot 133; when the latch 13 is in the second position, the end of the second fixed post 33 extends into the fourth slot 134.

[0056] In the above scheme, the third traveling mechanism 3 is preferably symmetrically distributed with the second traveling mechanism 2 (located on opposite sides of the latch 13), that is, the second direction and the third direction are the same. The working process of the third traveling mechanism 3 is coordinated with the extension and retraction of the latch 13, and the extension and retraction of the second fixing post 33 achieves bidirectional limiting of the latch 13.

[0057] As for the working process and principle of the third traveling mechanism 3, it is similar to the working process of the second traveling mechanism 2 in the previous embodiment, and will not be described again in this embodiment.

[0058] It is worth mentioning that by setting up a third traveling mechanism 3, it can cooperate with the second traveling mechanism 2 to significantly improve the stability of the latch 13 and suppress multi-dimensional shaking. Compared with single-sided limiting, the bidirectional clamping of the two fixed posts can apply constraints from both sides of the latch 13 simultaneously, effectively limiting the positional displacement of the latch 13 in the second and third directions, while reducing the torsion or tilting of the latch 13 caused by uneven force. Especially in complex vibration environments such as vehicle bumps, it can significantly reduce the multi-dimensional shaking of the latch 13 and ensure the fixed reliability of the ceiling screen. Furthermore, the bidirectional limiting ensures that the constraint reaction force on the latch 13 is evenly distributed on the two fixed posts and the slot, avoiding wear or deformation of the fixed post on one side due to long-term concentrated stress, reducing the wear rate of individual components, and extending the service life of the entire latch telescopic mechanism.

[0059] In the above technical solution, the first slot 131, the second slot 132, the third slot 133, and the fourth slot 134 form a "double-sided, double-position" limiting system, ensuring that the latch 13 is symmetrically constrained on both sides in both the extended state (second position) and the retracted state (first position). This effectively suppresses the multi-dimensional swaying (such as left-right deviation, twisting, etc.) of the latch 13 under complex conditions such as vehicle bumps and vibrations. Furthermore, the precise engagement of the double-sided slots with the fixing post strictly constrains the latch 13 to the preset first directional trajectory, preventing the latch 13 from "deviating" due to unilateral limiting and improving the accuracy of the action. Of course, the interval between the third slot 133 and the fourth slot 134 can also be flexibly adjusted according to the actual travel of the latch 13, making it more adaptable to the installation space and achieving efficient and stable locking function within a limited space.

[0060] As for how the third card slot 133 and the fourth card slot 134 cooperate with the third traveling mechanism 3 to complete the working process and principle, it is similar to how the first card slot 131 and the second card slot 132 in the previous embodiment cooperate with the second traveling mechanism 2, and will not be described again here.

[0061] See Figure 1 As shown, in a preferred embodiment, the third traveling mechanism 3 includes a third electromagnetic drive 31 and a third elastic connector 32, and the third electromagnetic drive 31 and the second fixed column 33 are connected by the third elastic connector 32.

[0062] In the above scheme, the operation of the third traveling mechanism 3 is synchronized with that of the second traveling mechanism 2. When the third electromagnetic drive 31 is powered on (slowly powered on), a slowly increasing electromagnetic force is generated, driving the second fixed post 33 to retract to the fifth position along the second direction. At the same time, the third elastic connector 32 is compressed, releasing the constraint on the latch 13 (at this time, the latch 13 can move freely along the first direction). When the third electromagnetic drive 31 is powered off (slowly powered off), the third elastic connector 32 releases elastic potential energy, pushing the second fixed post 33 to extend to the sixth position along the second direction. Its end is embedded in the third slot 133 or the fourth slot 134 on the corresponding side of the latch 13, forming a double-sided limit with the second traveling mechanism 2.

[0063] As for the more specific working process, principle and technical effect of the third traveling mechanism 3, it is similar to the working process of the second traveling mechanism 2 in the previous embodiment, and will not be repeated here.

[0064] See Figure 3 As shown, in a preferred embodiment, the third electromagnetic drive 31 also includes an electromagnetic element 5. The electromagnetic element 5 includes a yoke 51, an iron core 52, a bobbin 53, a coil 54, a top cover 55, and a housing 56. The iron core 52 is fixedly disposed within the through hole of the yoke 51. The bobbin 53 is disposed outside the iron core 52, and its outer wall is provided with a winding groove. The coil 54 is tightly wound within the winding groove. The top cover 55 is disposed at the open end of the yoke 51 to encapsulate the iron core 52, the bobbin 53, and the coil 54 inside the yoke 51. The housing 56 is fixedly installed on the outside of the top cover 55, and the third elastic connector 32 is connected to its corresponding housing 56.

[0065] In the above technical solution, the electromagnetic element 5 of the third electromagnetic drive 31 operates in the same way, transmitting force through the electromagnetic effect generated by the slow switching of the coil 54 on and off. The working process, principle, and technical effects of the electromagnetic element 5 are similar to those of the electromagnetic element 5 in the previous embodiment, and will not be repeated here.

[0066] Example 3 In another embodiment of this utility model, a positional design scheme for the first traveling mechanism 1, the second traveling mechanism 2, and the third traveling mechanism 3 is provided.

[0067] See Figure 1 As shown, in the technical solution of this embodiment, the second traveling mechanism 2 and the third traveling mechanism 3 are located on opposite sides of the locking tongue 13, that is, the second direction and the third direction are the same.

[0068] For example, when the first traveling mechanism 1 is installed horizontally, the horizontal direction (first direction) is dedicated to the extension and retraction of the locking tongue 13, and is driven independently by the first traveling mechanism 1 to ensure a clear main motion trajectory without redundant interference. The vertical direction (second direction, third direction) serves as an auxiliary constraint direction, and the actions of the two fixed posts are controlled by the symmetrically distributed second traveling mechanism 2 and third traveling mechanism 3, focusing on the posture stability of the locking tongue 13, forming a functional separation system of "horizontal drive - vertical limit".

[0069] More specifically, the vertically symmetrical second and third traveling mechanisms 2 and 3 can suppress the vertical swaying of the latch 13 in both directions. When the vehicle is bumpy, the lower first fixing post 23 can prevent the latch 13 from shifting downward, and the upper second fixing post 33 can limit its upward tilting. Combined with the horizontal driving stability, the attitude error of the latch 13 during the extension and retraction process and in the stationary state is controlled within a very small range, reducing the jamming and abnormal noise caused by swaying.

[0070] Example 4 In another embodiment of this utility model, a hardware design scheme for a latch extension mechanism is provided.

[0071] See Figure 4 As shown, in this embodiment, the latch extension mechanism further includes an MCU 4 and a first power supply 41, a second power supply 42, and a third power supply 43 electrically connected to the MCU 4. The first power supply 41 is electrically connected to the first electromagnetic drive 11, the second power supply 42 is electrically connected to the second electromagnetic drive 21, and the third power supply 43 is electrically connected to the third electromagnetic drive 31. The first power supply 41, the second power supply 42, and the third power supply 43 are equipped with power chips, which provide a stable current source for the first traveling mechanism 1, the second traveling mechanism 2, and the third traveling mechanism 3.

[0072] In the above scheme, the working process of the latch telescopic mechanism is controlled by MCU 4. By precisely controlling the power-on and power-off timing of the power chip, the movement state of the latch 13 and the two fixed posts is regulated. The specific working process and principle are as follows: When the ceiling screen needs to be turned on, the corresponding locking tongue 13 retracts: the MCU 4 controls the power chip to power on in a preset sequence, first slowly powering on the second traveling mechanism 2 and the third traveling mechanism 3 to drive the two fixed columns to retract smoothly and release the limit, then powering on the first traveling mechanism 1, and controlling the current rise speed to make the locking tongue 13 retract smoothly in the horizontal direction.

[0073] When the ceiling screen is closed, the corresponding locking tongue 13 extends: the MCU 4 controls the power chip to power down in sequence, first slowly powering down the first moving mechanism 1, and the locking tongue 13 extends smoothly under the action of elastic force. After it is in place, the second moving mechanism 2 and the third moving mechanism 3 are slowly powered down, and by controlling the current drop speed, the two fixed posts are slowly extended to re-limit, completing the linkage with the ceiling screen switch state.

[0074] Based on the MCU 4's control of the current switching sequence, the sequential logic of the actions of the two fixed posts and the latch 13 can be guaranteed. Combined with the regulation of the current rise and fall speed, the extension and retraction of the latch 13 and the two fixed posts are made smoother, reducing impact and jamming. Furthermore, by slowly powering on and off, the instantaneous impact force of the latch extension and retraction mechanism is reduced, reducing component wear and extending service life.

[0075] Example 5 Based on the same design concept, this utility model also provides an embodiment of a ceiling-mounted screen, which includes the latch telescopic mechanism described in the above embodiment.

[0076] In this embodiment, the ceiling-mounted screen also includes a rotatable display screen, which has a fifth slot (preferably located at the edge). When the display screen is closed, the locking tongue 13 extends along a first direction to a second position and engages with the fifth slot. When the display screen is open, the locking tongue 13 retracts along the first direction to the first position.

[0077] In the above technical solution, the linkage between the latch extension mechanism and the display screen revolves around the "off-on" state switching of the display screen, and the specific working process is as follows: Display closed state (locking tongue 13 locked): When the display rotates from the open state to the closed state, the fifth slot on its edge moves synchronously with the display, gradually approaching the locking tongue extension mechanism. At this time, the MCU 4 receives the display closed signal and controls the first electromagnetic drive 11 to slowly de-energize, the first elastic connector 12 releases its elastic force, and drives the locking tongue 13 to extend smoothly in the first direction. During the extension of the locking tongue 13, the MCU 4 synchronously controls the second electromagnetic drive 21 of the second traveling mechanism 2 and the third traveling mechanism 3 to slowly de-energize, the first fixing post 23 and the second fixing post 33 extend smoothly under the action of elastic force, and embed into the two side slots of the locking tongue 13 to form a vertical limit, ensuring that the locking tongue 13 moves smoothly along the preset trajectory. When the display is fully closed, the locking tongue 13 extends exactly to the second position, and its end is precisely locked into the fifth slot of the display, locking the display in the closed state through mechanical engagement, preventing accidental opening caused by vehicle bumps.

[0078] Display screen open state (locking tongue 13 unlocked): When the display screen needs to be opened, the MCU 4 receives an open signal and first controls the second electromagnetic drive unit 21 of the second traveling mechanism 2 and the third traveling mechanism 3 to slowly power on, driving the first fixed post 23 and the second fixed post 33 to retract along the second direction (releasing the restriction on the locking tongue 13). Then, it controls the first electromagnetic drive unit 11 to slowly power on, and the electromagnetic force overcomes the elastic force of the first elastic connector 12, driving the locking tongue 13 to smoothly retract to the first position in the horizontal direction, with its end completely disengaged from the fifth slot of the display screen, thus releasing the lock. After the locking tongue 13 smoothly retracts, the display screen rotates and opens under the action of its own drive mechanism (such as a hinge or motor). After the display screen is fully unfolded, the MCU 4 controls each electromagnetic drive unit to power off, the locking tongue 13 remains in the retracted state, and the first fixed post 23 and the second fixed post 33 extend again.

[0079] Therefore, the precise linkage between the latch 13 and the display screen can be achieved through the coordinated mechanism of "mechanical locking - electromagnetic unlocking" of the latch extension mechanism, resulting in strong stability in use.

[0080] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A locking tongue telescopic mechanism, characterized in that, The device includes a traveling mechanism, which includes a first traveling mechanism. The first traveling mechanism includes a first electromagnetic drive, a first elastic connector, and a locking tongue. The first electromagnetic drive and the locking tongue are connected by the first elastic connector. When the first electromagnetic drive is powered on, it can drive the locking tongue to compress the first elastic connector along a first direction and smoothly retract to a first position. When the first electromagnetic drive is powered off, the first elastic connector can drive the locking tongue to smoothly extend to a second position along the first direction.

2. The locking tongue telescopic mechanism according to claim 1, characterized in that, During the power-on process of the first electromagnetic drive, its current gradually increases from zero to a non-zero set value within a first preset time, so that the latch smoothly retracts to the first position along the first direction; during the power-off process of the first electromagnetic drive, its current gradually decreases from a non-zero set value to zero within a second preset time, so that the latch smoothly extends to the second position along the first direction. The first preset time and the second preset time may be equal or unequal.

3. The locking tongue telescopic mechanism according to claim 1, characterized in that, The traveling mechanism further includes a second traveling mechanism, which includes a first fixed post capable of reciprocating and extending along a second direction perpendicular to the first direction; the latch is provided with a first slot and a second slot at intervals on the side facing the second traveling mechanism; wherein, when the latch is in the first position, the end of the first fixed post extends into the first slot; when the latch is in the second position, the end of the first fixed post extends into the second slot.

4. The locking tongue telescopic mechanism according to claim 3, characterized in that, The traveling mechanism further includes a third traveling mechanism, which includes a second fixed post capable of reciprocating and extending along a third direction perpendicular to the first direction; the latch is provided with a third slot and a fourth slot on the side facing the third traveling mechanism; wherein, when the latch is in the first position, the end of the first fixed post extends into the third slot; when the latch is in the second position, the end of the first fixed post extends into the fourth slot.

5. The locking tongue telescopic mechanism according to claim 4, characterized in that, The second traveling mechanism and the third traveling mechanism are located on opposite sides of the locking tongue, and the second direction and the third direction are the same.

6. The locking tongue telescopic mechanism according to claim 4, characterized in that, The second traveling mechanism includes a second electromagnetic drive and a second elastic connector. The second electromagnetic drive and the first fixed post are connected by the second elastic connector. When the second electromagnetic drive is powered on, it can drive the first fixed post to compress the second elastic connector along the second direction and smoothly retract to the third position. When the second electromagnetic drive is powered off, the second elastic connector can drive the first fixed post to smoothly extend to the fourth position along the second direction.

7. The locking tongue telescopic mechanism according to claim 6, characterized in that, The third traveling mechanism includes a third electromagnetic drive and a third elastic connector. The third electromagnetic drive and the second fixed post are connected by the third elastic connector. When the third electromagnetic drive is powered on, it can drive the second fixed post to compress the third elastic connector along the third direction and smoothly retract to the fifth position. When the third electromagnetic drive is powered off, the third elastic connector can drive the second fixed post to smoothly extend to the sixth position along the third direction.

8. The locking tongue telescopic mechanism according to claim 7, characterized in that, The first, second, and third electromagnetic drive components all include electromagnetic elements. Each electromagnetic element includes a yoke, an iron core, a bobbin, a coil, a top cover, and a housing. The iron core is fixedly disposed within a through hole in the yoke. The bobbin is disposed outside the iron core, and a winding groove is provided on the outer wall of the bobbin. The coil is tightly wound within the winding groove. The top cover is disposed at the open end of the yoke to encapsulate the iron core, the bobbin, and the coil inside the yoke. The cover is fixedly installed on the outside of the upper cover, and the first elastic connector, the second elastic connector and the third elastic connector are respectively connected to their respective corresponding covers.

9. The locking tongue telescopic mechanism according to claim 7, characterized in that, The latch extension mechanism also includes an MCU and a first power supply, a second power supply and a third power supply electrically connected to the MCU. The first power supply is electrically connected to the first electromagnetic drive, the second power supply is electrically connected to the second electromagnetic drive, and the third power supply is electrically connected to the third electromagnetic drive.

10. A ceiling-mounted screen comprising the latch telescopic mechanism according to any one of claims 1-9, characterized in that, The ceiling-mounted screen also includes a rotatable display screen, which has a fifth slot; when the display screen is closed, the latch extends to a second position along a first direction and engages with the fifth slot; when the display screen is open, the latch retracts to a first position along a first direction.

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