A headrest rod guide sleeve, quick disassembly structure, music headrest and seat

Abstract

The utility model relates to the field of automobile parts, concretely relates to a headrest rod guide sleeve, quick detach structure, music headrest and seat, including guide sleeve body, the radial activity installation limiting block is installed on guide sleeve body, the elastic member is connected on limiting block, and the elastic member gives the force that limiting block moves to guide sleeve body inside direction, be equipped with the first guide slope of sliding fit in the process that second plug connector moves from the direction below limiting block to the above limiting block and the second guide slope of sliding fit in the process that second plug connector moves from the direction above limiting block to the below limiting block on limiting block, be equipped with the resistance part in guide sleeve body. The scheme solves the problem that the headrest cannot carry out height adjustment, guarantees second plug connector after first plug connector and second plug connector separate, second plug connector cannot drop down, and second plug connector cannot move down and can be connected with first plug connector smoothly when first plug connector and second plug connector begin to insert.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, specifically to a headrest rod guide sleeve, a quick-release structure, a music headrest, and a seat. Background Technology

[0002] Current car seats are equipped with music headrests. The headrest rod is inserted into the seat, and a wiring harness is located inside the headrest rod. This wiring harness connects to electronic components inside the seat, thus electrically connecting the seat and the music headrest. However, in this technology, the wiring harness is a single, continuous unit that cannot be plugged in or unplugged. This prevents the music headrest from being easily and independently removed. If the music headrest is forcibly pulled upwards from the seat, the wiring harness may be pulled out as well, potentially breaking and damaging it.

[0003] To address the aforementioned issues, existing technology divides the entire wiring harness into a headrest harness and a seat harness. The headrest harness connects to a first connector, and the seat harness connects to a second connector. The first and second connectors are detachably connected. The first connector is mounted on the headrest rod of the headrest, and the second connector is mounted inside the seat. When the headrest rod is inserted into the seat, the first and second connectors engage, thus connecting the headrest harness to the seat harness. When the headrest is removed from the seat, the first and second connectors separate, disconnecting the headrest harness from the seat harness, allowing the headrest to be removed.

[0004] However, in the existing technology, after the first and second connectors are plugged in and fixed, the connected first and second connectors cannot be adjusted vertically, thus making it impossible to adjust the height of the headrest. If the second connector can move vertically inside the seat, a challenge arises in ensuring that the second connector does not fall off and remains fixed in its original position after the first connector separates from the second connector. Simultaneously, a second challenge arises in ensuring that the second connector does not move downwards and smoothly connects with the first connector when the first connector begins to move towards the second connector for insertion. Utility Model Content

[0005] This utility model aims to provide a headrest rod guide sleeve, a quick-release structure, a music headrest, and a seat to solve the problem that the headrest cannot be height-adjusted in the prior art. At the same time, it ensures that after the first connector and the second connector are separated, the second connector cannot fall downwards, and when the first connector and the second connector are first inserted, the second connector will not move downwards and can be smoothly connected with the first connector.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a headrest rod guide sleeve, comprising a guide sleeve body, a limiting block radially movably mounted on the guide sleeve body, an elastic element connected to the limiting block, and the elastic element exerting a force on the limiting block to move in the direction of the guide sleeve body; The limiting block is provided with a first guide slope for sliding engagement during the process of the second plug moving from the lower part of the limiting block to the upper part of the limiting block, and a second guide slope for sliding engagement during the process of the second plug moving from the upper part of the limiting block to the lower part of the limiting block. The second guide slope is located above the first guide slope. The guide sleeve body is provided with a stop part to prevent the second connector from moving upward, and the stop part is located above the limit block.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a quick-disassembly structure, including a headrest rod guide sleeve, and further including a first connector that can be connected to the headrest rod and a second connector that can slide within the guide sleeve; the first connector and the second connector can be inserted into each other and can be separated under external force; the side of the second connector is provided with a third guide slope for sliding cooperation with the first guide slope.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a music headrest, including a headrest rod and a quick-release structure; a first connector is installed at the end of the headrest rod.

[0009] To achieve the above objectives, this utility model adopts the following technical solution: a seat, including a headrest rod guide sleeve; or, Including quick-release structures; or, Including a music headrest.

[0010] The principle and advantages of the above scheme are as follows: the first connector is installed on the headrest rod. When the headrest rod is inserted into the seat, the first connector and the second connector are plugged into each other, thereby realizing the electrical connection between the first connector and the second connector. The wiring harness on the headrest and the wiring harness inside the seat are connected together.

[0011] Since the second connector can slide within the guide sleeve, when the headrest height is adjusted, the first and second connectors connected together slide vertically within or below the headrest rod guide sleeve, and the first and second connectors connected together will not affect the height adjustment of the headrest rod.

[0012] When the headrest needs to be moved upwards to remove it from the seat, the headrest is moved upwards, and the headrest rod moves upwards within the headrest rod guide sleeve. The first and second connectors, which are connected together, move to the first guide ramp. The second connector slides relative to the first guide ramp, and pushes the first guide ramp. The limiting block moves away from the second connector, and the limiting block applies force to the elastic element. The limiting block does not obstruct the upward movement of the second connector. The second connector moves above the limiting block, and then abuts against the stop part. The second connector can no longer move upwards. The first and second connectors separate from each other under the external force of the headrest rod moving upwards, and the headrest rod can be removed from the seat.

[0013] After the headrest bar is removed, the second connector is located above the limiting block, which prevents the second connector from moving downwards, thus keeping the second connector in its original position to await connection with the first connector next time.

[0014] When the headrest bar is inserted into the seat again, the first connector moves downward with the headrest bar. The first connector moves to the second connector and the first connector connects with the second connector. As the headrest continues to be pushed downward, the second connector slides relative to the second guide slope. The second connector pushes the second guide slope, and the limiting block moves away from the second connector. The limiting block applies force to the elastic element. The limiting block does not hinder the downward movement of the second connector. The second connector moves below the limiting block. At this time, as the headrest moves, the first and second connectors that are connected also move vertically.

[0015] In summary, the above-mentioned solution has the following beneficial effects: 1. The first and second connectors can be plugged together. When the headrest rod is inserted into the seat, the first and second connectors automatically connect, making the connection convenient. When the headrest rod is removed, the first and second connectors separate under external force, thus achieving quick disassembly of the headrest. The wiring harness will not affect the disassembly of the headrest.

[0016] 2. When the headrest is height adjusted, the first and second connectors can move together and are plugged into each other without separating. The first and second connectors can be stably connected, thus ensuring smooth height adjustment of the headrest and solving the problem of the headrest being unable to be height adjusted.

[0017] 3. After the first and second connectors separate, the second connector is positioned above the limiting block. The limiting block prevents the second connector from moving downwards, thus preventing it from falling. The second connector remains in its original position, awaiting the next insertion with the first connector. During the next insertion, the limiting block provides downward resistance to the second connector, facilitating a stable connection between the first and second connectors and preventing the second connector from falling before the connection is secure. Once the first and second connectors are properly connected, increasing the downward force on the headrest causes the second connector to slide relative to the second guide surface. The limiting block moves away from the second connector, thus allowing it to move downwards.

[0018] 4. The first guide slope is designed so that when the first connector and the second connector move upward, the second connector slides relative to the first guide slope, thereby causing the limiting block to move away from the second connector. The limiting block will not provide significant resistance to the upward movement of the second connector, thus preventing the first connector and the second connector from separating before the second connector moves above the limiting block.

[0019] 5. By setting a third guide ramp on the second connector, when the headrest rod moves upward, the third guide ramp and the first guide ramp slide relative to each other. Compared with not setting a third guide ramp, it is easier to push the limiting block to move, so that the limiting block avoids the upward movement of the second connector. The resistance of the limiting block to the upward movement of the second connector is small, and the first connector and the second connector are not easy to separate. This greatly avoids the first connector and the second connector separating before the second connector moves above the limiting block.

[0020] Preferably, as an improvement, the headrest rod guide sleeve is a single integrated guide sleeve body. Therefore, the headrest rod guide sleeve is not composed of multiple connected guide sleeve bodies, eliminating the need for assembly of multiple guide sleeve bodies, making operation simple and convenient.

[0021] Preferably, as an improvement, the length of the first guide bevel is greater than the length of the second guide bevel; the acute angle between the first guide bevel and the side wall of the guide sleeve is smaller than the acute angle between the second guide bevel and the side wall of the guide sleeve.

[0022] Therefore, the slope of the second guide ramp (the acute angle between the second guide ramp and the side wall of the guide sleeve) is greater than that of the first guide ramp (the acute angle between the first guide ramp and the side wall of the guide sleeve). This ensures that when the second connector moves downward, the resistance of the limiting block on the second connector is greater, and the limiting block and the second connector are less likely to slip relative to each other. The limiting block is less likely to avoid the second connector, preventing the second connector from being pushed below the limiting block before the first connector is stably connected. This helps to ensure a stable connection between the first and second connectors. On the other hand, the slope of the first guide ramp is smaller, and the inclination of the first guide ramp relative to the side wall of the headrest rod guide sleeve is more gradual. When the second connector moves upward, it is easier to push the limiting block to move and avoid it, greatly preventing the second connector from separating from the first connector before it has moved above the limiting block.

[0023] Preferably, as an improvement, the outer wall of the guide sleeve is fixedly provided with a receiving part, the receiving part is provided with a receiving cavity, the receiving cavity is connected to the inside of the guide sleeve, the limiting block is slidably located in the receiving cavity, and a cover is fixed on the receiving part to close the receiving cavity; the elastic element is located between the limiting block and the cover.

[0024] Therefore, the receiving cavity of the receiving part is used to accommodate the limiting block and the elastic element. The limiting block and the elastic element are mounted on the guide sleeve by being installed in the receiving cavity. The cover is used to close the opening of the receiving cavity, preventing the limiting block and the elastic element from falling out of the receiving cavity. The elastic element is located between the limiting block and the cover, and the elastic element applies pressure to the limiting block, thereby providing a force for the limiting block to move inside the guide sleeve.

[0025] Preferably, as an improvement, the cover is provided with a first snap-fit ​​portion, and the receiving portion is provided with a first snap-fit ​​groove, the first snap-fit ​​portion being snapped into the first snap-fit ​​groove; or, The cover is provided with a first snap-fit ​​groove, and the receiving part is provided with a first snap-fit ​​part, which is snapped into the first snap-fit ​​groove.

[0026] Therefore, by engaging the first snap-fit ​​part in the first snap-fit ​​groove, the cover and the receiving part are secured together. This connection method is simple and convenient; the cover is simply snapped onto the receiving part without the need for screws, bolts, or other threaded fasteners, making operation simple and convenient. It also saves on screws, bolts, and other threaded fasteners, reducing production costs. This solves the problems of inconvenient and costly connection between the cover and the receiving part.

[0027] Preferably, as an improvement, a metal sleeve is fixedly fitted on the outer side of the guide sleeve, and the metal sleeve has a flat portion.

[0028] The metal sleeve is used for welding to the seat's internal frame. This fixes the metal sleeve to the seat's internal frame, and the guide sleeve is fixed to the metal sleeve, thus securing the headrest rod guide sleeve to the seat. The flat portion, compared to a circular metal sleeve, increases the contact area with the seat's internal frame, facilitating welding and improving weld strength. This solves the problems of difficult or weak welding between the metal sleeve and the seat frame.

[0029] Preferably, as an improvement, a limiting spring is snapped into the second connector; the limiting spring is provided with a snap-fit ​​end for snapping into the headrest bar.

[0030] Therefore, by attaching the limiting spring to the second connector, the installation of the limiting spring on the second connector is simpler and faster, eliminating the need for screws, nuts, or other threaded fasteners for fixing, thus saving the cost of threaded fasteners and solving the problems of troublesome and costly installation of the limiting spring.

[0031] The reason for setting the limiting spring is that when the first connector and the second connector are plugged together, the snap-fit ​​end on the limiting spring is locked onto the headrest rod. The limiting spring plays a role in fixing the second connector and the headrest rod, so that the connection between the second connector and the first connector is more stable and the first connector and the second connector are less likely to fall off.

[0032] Preferably, as an improvement, the first connector is integrally provided with a second locking part for locking onto the headrest bar.

[0033] Thus, by securing the second snap-fit ​​part to the headrest rod, the first connector and the headrest rod are fixed in place, preventing the first connector from easily detaching from the headrest rod. The second snap-fit ​​part is integrally formed on the first connector, allowing the first connector to be directly snapped onto the headrest rod. This eliminates the need for other components to connect the first connector and the headrest rod, simplifying the structure and reducing production costs. Attached Figure Description

[0034] Figure 1 This is a schematic diagram showing the headrest rod being inserted into the headrest rod guide sleeve.

[0035] Figure 2 This is a three-dimensional view of the metal sleeve.

[0036] Figure 3 This is a schematic diagram of the assembly of the first connector and the headrest rod.

[0037] Figure 4 A schematic diagram showing the connection between the second connector and the headrest rod.

[0038] Figure 5 This is an assembly diagram of the limiting spring and the second connector.

[0039] Figure 6 This is a three-dimensional view of the headrest rod guide sleeve.

[0040] Figure 7 This is a 3D view of two opposing limit blocks.

[0041] Figure 8 This is a three-dimensional view of the cover.

[0042] Figure 9 This is a three-dimensional view of the headrest rod guide sleeve. The receiving part is not covered, and the elastic element and limiting block inside the receiving part are shown.

[0043] Figure 10 This is a schematic diagram of the headrest rod guide sleeve.

[0044] Figure 11 for Figure 10 A sectional view along line AA, the limiting block is not shown in the figure; the second connector is located above the limiting block (if shown), and the bottom of the second connector abuts against the second guide slope. Detailed Implementation

[0045] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: headrest rod 1, entry groove 11, slot 12, cap body 2, metal sleeve 3, flat part 31, headrest rod guide sleeve 4, connecting section 41, locking block 42, receiving part 43, cover body 44, first locking groove 45, first locking part 46, elastic element 47, guide rib 48, limiting block 49, guide groove 491, second guide slope 492, first guide slope 493, compression spring groove 494, second plug joint 5, third guide slope 51, assembly groove 52, locking block 53, limiting spring 54, locking end 55, slot part 56, plug rod 57, first plug joint 6, second locking part 61, insertion hole 62, and blocking part 7.

[0046] The basic implementation examples are as follows: Figures 1-11 As shown.

[0047] This embodiment discloses a headrest rod guide sleeve and a quick-release structure, which are applied to car seats, specifically to the music headrest of a car seat. Therefore, the car seat and the music headrest also include the headrest rod guide sleeve 4 and the quick-release structure in this embodiment.

[0048] The structure and principle will be introduced in detail below, taking into account the specific application scenarios of the headrest rod guide sleeve 4 and the quick disassembly structure.

[0049] A quick-release structure includes a headrest rod guide sleeve 4, a first connector 6, and a second connector 5 slidably disposed within the headrest rod guide sleeve 4.

[0050] For headrest rod guide sleeve 4, combined with Figure 1 , Figure 6 As shown, it includes a guide sleeve body, a connecting section 41 on the guide sleeve body, and a metal sleeve 3 fitted on the outer side of the connecting section 41. The guide sleeve body is made of plastic. Figure 6 As shown, the outer wall of the connecting section 41 is provided with a locking block 42, which will... Figure 2 The metal sleeve 3 is fitted onto the connecting section 41, and the cap 2 is placed on top of the connecting section 41 (e.g., Figure 1 As shown in the diagram, the cap body 2 has a snap-fit ​​hole, and the snap-fit ​​block 42 snaps into the snap-fit ​​hole, thus achieving the connection between the cap body 2 and the top of the connecting section 41. In this way, the metal sleeve 3 is limited and fixed on the connecting section 41, realizing the connection between the guide sleeve and the metal sleeve 3. Combined with... Figure 2 As shown, the metal sleeve 3 is provided with a flat part 31. The flat part 31 is flat, and the flat part 31 is provided to facilitate the welding of the metal sleeve 3 to the frame inside the seat. Since the flat part 31 is flat, the welding area between the metal sleeve 3 and the frame inside the seat can be increased, thereby improving the welding firmness. In this way, the metal sleeve 3 is more stably fixed inside the seat. Since the guide sleeve is located inside the metal sleeve 3, the guide sleeve is fixed inside the seat by means of the connection between the metal sleeve 3 and the seat frame.

[0051] Combination Figures 6-11 As shown, the guide sleeve body has a radially movable limiting block 49 for acting on the second connector 5 on its side wall. Specifically, the outer side wall of the guide sleeve body has two integrally fixed receiving portions 43, each containing a receiving cavity that communicates with the interior of the guide sleeve body. The two limiting blocks 49 are located within the receiving cavities. An elastic element 47, specifically a compression spring, is installed within each receiving cavity. A cover 44 is placed on top of the receiving portion 43 to seal the receiving cavity. Figure 8 As shown, the cover 44 is integrally provided with two first snap-fit ​​parts 46, which are combined with Figure 6 As shown, the receiving portion 43 is provided with two first snap-fit ​​grooves 45. When the cover 44 is placed over the opening of the receiving cavity, the first snap-fit ​​part 46 engages in the first snap-fit ​​grooves 45, thereby connecting the cover 44 and the receiving portion 43. Of course, in other embodiments, the receiving portion 43 may also be provided with a first snap-fit ​​part, and the cover 44 may be provided with a first snap-fit ​​groove. The connection between the cover 44 and the receiving portion 43 is achieved through the snap-fit ​​of the first snap-fit ​​part and the first snap-fit ​​groove. In this embodiment, the receiving portion 43 is cylindrical and the cover 44 is circular. Of course, in other embodiments, other shapes may be used, such as the cover 44 being square and the receiving portion 43 being square columnar.

[0052] In this embodiment, the compression spring is located between the limiting block 49 and the cover 44. The compression spring applies pressure to the limiting block 49, thereby giving the limiting block 49 a force that allows it to move inward toward the inside of the guide sleeve. Figure 7As shown, the limiting block 49 has a spring groove 494 on its side facing the cover 44, and one end of the spring is located in the spring groove 494, thereby achieving the contact between the end of the spring and the limiting block 49. Figure 7 and Figure 9 As shown, a guide groove 491 is provided on the outer side wall of the limiting block 49, and a guide rib 48 is integrally provided on the inner wall of the receiving cavity. The limiting block 49 is located in the receiving cavity, and the guide rib 48 is located in the guide groove 491. The guide rib 48 and the guide groove 491 are slidably engaged, so that the limiting block 49 slides more stably in the receiving cavity. Since the guide rib 48 is located in the guide groove 491, the limiting block 49 will not rotate in the receiving cavity.

[0053] The limiting block 49 is installed in the receiving cavity and extends into the guide sleeve body. (Combination) Figure 7 As shown, the limiting block 49 has a first guide slope 493 and a second guide slope 492 on its side surface inside the guide sleeve body. The second guide slope 492 is located above the first guide slope 493. Both the first guide slope 493 and the second guide slope 492 are located inside the guide sleeve body. The top end of the first guide slope 493 and the bottom end of the second guide slope 492 are both close to the center line of the guide sleeve body. The length of the first guide slope 493 is greater than the length of the second guide slope 492. The acute angle between the first guide slope 493 and the inner wall (vertical surface) of the guide sleeve body is smaller than the acute angle between the second guide slope 492 and the side wall (vertical surface) of the guide sleeve body. In this embodiment, the acute angle between the first guide slope 493 and the inner wall of the guide sleeve body is, for example, 15°, and the acute angle between the second guide slope 492 and the inner wall of the guide sleeve body is, for example, 60°. The corresponding acute angles can be changed according to the actual situation.

[0054] In this embodiment, the first connector 6 is connected to the bottom end of the headrest rod 1. The specific connection method is as follows: combining Figure 3 As shown, the first connector 6 can be inserted into the hole at the bottom end of the headrest rod 1. The side wall at the bottom end of the headrest rod 1 is provided with a slot 12 and an entry groove 11 communicating with the slot 12. The entry groove 11 extends to the bottom surface of the headrest rod 1. The outer side wall of the first connector 6 is integrally formed with a second engaging part 61. When the first connector 6 is inserted into the end of the headrest rod 1, the second engaging part 61 enters the entry groove 11. Then, by rotating the first connector 6, the second engaging part 61 engages in the slot 12, and the second engaging part 61 and the slot 12 abut against each other, thus achieving the connection between the first connector 6 and the bottom end of the headrest rod 1. The first connector 6 will not detach from the bottom end of the headrest rod 1. The first connector 6 is provided with a socket 62 for inserting the insert rod 57 at the top of the second connector 5. By inserting the insert rod 57 into the socket 62, the electrical connection between the first connector 6 and the second connector 5 is achieved.

[0055] Combination Figure 4As shown, in this embodiment, the top of the second connector 5 is provided with a slot for inserting the headrest rod 1. The headrest rod 1 is inserted into the slot, the top of the second connector 5 surrounds the bottom of the headrest rod 1, and the insertion rod 57 at the top of the second connector 5 is inserted into the insertion hole 62 on the first connector 6. Combined with... Figure 4 and Figure 5 As shown, the second connector 5 is equipped with two limiting spring pieces 54 for engaging with the slot 12. The limiting spring pieces 54 are arranged opposite each other. The specific fixing method of the limiting spring pieces 54 and the second connector 5 is as follows: The second connector 5 has an assembly groove 52 on its side. A snap-fit ​​block 53 is integrally fixed inside the assembly groove 52. The bottom of the limiting spring piece 54 has two assembly parts for inserting into the assembly groove 52. These two assembly parts are opposite each other, and each assembly part has a slot 56. By inserting the assembly part into the assembly groove 52, the snap-fit ​​block 53 is engaged in the slot 56, thus achieving the snap-fit ​​fixing of the limiting spring piece 54 onto the second connector 5. The top of the limiting spring piece 54 has a snap-fit ​​end 55, which engages in the slot 12 on the outside of the headrest rod 1, thus achieving the snap-fit ​​connection between the headrest rod 1 and the second connector 5. The second connector 5 is stably connected to the bottom end of the headrest rod 1. In addition, the second connector 5 is provided with third guide slopes 51 on its left and right sides. In this embodiment, the two third guide slopes 51 can slide and engage with the first guide slopes 493 on the two limiting blocks 49.

[0056] Combination Figure 11 As shown, the guide sleeve body is provided with a stop 7 to prevent the second connector 5 from moving upward. The stop 7 is located above the receiving cavity (above the limiting block 49). By abutting against the top of the second connector 5, the stop 7 can prevent the second connector 5 from continuing to move upward.

[0057] The specific implementation process is as follows: The first connector 6 is pre-installed in the end of the headrest rod 1. A wire harness is connected to the first connector 6, and the wire harness on the first connector 6 is connected to the electronic components of the music headrest. The second connector 5 is located in the guide sleeve body. A wire harness is connected to the second connector 5, and the wire harness on the second connector 5 is connected to the electronic components inside the seat.

[0058] Initially, the second connector 5 is located Figure 11 In the middle guide sleeve, the second connector 5 is positioned above the limiting block 49. When the headrest is inserted into the seat, the headrest rod 1 enters the guide sleeve, the first connector 6 moves to the second connector 5, and the insertion rod 57 on the second connector 5 inserts into the insertion hole 62 of the first connector 6. The first connector 6 and the second connector 5 are then connected together, thus achieving electrical connection between the first connector 6 and the second connector 5. Simultaneously, combined with... Figure 4As shown, the locking end 55 of the limiting spring 54 on the second connector 5 is locked in the slot 12, thereby enabling the second connector 5 to be locked on the headrest rod 1, making the connection between the second connector 5 and the first connector 6 more stable.

[0059] During the downward movement of the first connector 6 to connect with the second connector 5, the limiting block 49, located below the second connector 5, blocks the second connector 5, preventing it from moving downward. The second connector 5 can then connect with the first connector 6 while positioned above the limiting block 49. After the first connector 6 and the second connector 5 are connected, if a larger downward force is applied to cause the headrest rod 1 to move downward, the second connector 5 will move downward under this force. The bottom of the second connector 5 (the bottom of the third guide ramp 51) pushes the second guide ramp 492. The limiting block 49, pushed downward by the second connector 5, compresses the elastic element 47, causing the limiting block 49 to retract. The limiting block 49 will no longer obstruct the downward movement of the second connector 5, allowing the headrest rod 1 to move downward and the second connector 5 to move below the limiting block 49.

[0060] Since the second connector 5 can move within or even below the guide sleeve, after the second connector 5 moves below the limiting block 49, as the headrest height is adjusted, the connected first connector 6 and second connector 5 slide vertically below the limiting block 49 within the guide sleeve along with the headrest rod 1. The connected first connector 6 and second connector 5 will not affect the height adjustment of the headrest rod 1. At the same time, the second connector 5 is secured to the headrest rod 1 by the limiting spring 54, and the second connector 5 will not fall off the headrest rod 1.

[0061] When the headrest needs to be moved upwards from the seat, the headrest is moved upwards, and the headrest rod 1 moves upwards. The first connector 6 and the second connector 5, which are connected together, move to the first guide slope 493. The third guide slope 51 on the second connector 5 slides relative to the first guide slope 493. The second connector 5 pushes the first guide slope 493, and the limiting block 49 moves away from the second connector 5. The limiting block 49 applies force to the elastic element 47. The limiting block 49 does not obstruct the upward movement of the second connector 5, and the second connector 5 moves above the limiting block 49. During this process, because the first guide slope 493 and the third guide slope 51 slide together, and the slope of the first guide slope 493 is small, the resistance of the limiting block 49 to the upward movement of the second connector 5 is small. The limiting block 49 can easily move to avoid the upward movement of the second connector 5, and the second connector 5 will not fall off the end of the headrest rod 1 due to the obstruction of the limiting block 49.

[0062] Then, the second connector 5 moves upward along with the headrest rod 1 to above the limiting block 49. The top of the second connector 5 abuts against the stop part 7, preventing it from moving further upward. Meanwhile, the headrest rod 1 continues to move upward. Under the external force of the upward movement of the headrest rod 1, the first connector 6 and the second connector 5 separate from each other. The locking end 55 of the limiting spring 54 is forcibly disengaged from the slot 12. The second connector 5 remains stationary above the limiting block 49, and the headrest rod 1 can be removed from the seat. The first connector 6 moves upward along with the headrest rod 1 and exits from the seat.

[0063] After the headrest rod 1 is removed, the second connector 5 is located above the limiting block 49, which prevents the second connector 5 from moving downwards. This keeps the second connector 5 in its original position, ready to connect with the first connector 6 next time. When the headrest rod 1 is inserted back into the seat, the corresponding connection process follows the procedure described above.

[0064] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A headrest rod guide sleeve, comprising a guide sleeve body, characterized in that: A limiting block is radially movably installed on the guide sleeve body, and an elastic element is connected to the limiting block. The elastic element provides a force to the limiting block to move inward in the guide sleeve body. The limiting block is provided with a first guide slope for sliding engagement during the process of the second plug moving from the lower part of the limiting block to the upper part of the limiting block, and a second guide slope for sliding engagement during the process of the second plug moving from the upper part of the limiting block to the lower part of the limiting block, wherein the second guide slope is located above the first guide slope. The guide sleeve body is provided with a stop part for preventing the second connector from moving upward, and the stop part is located above the limiting block.

2. The headrest rod guide sleeve according to claim 1, characterized in that: The length of the first guide bevel is greater than the length of the second guide bevel; the acute angle between the first guide bevel and the side wall of the guide sleeve is less than the acute angle between the second guide bevel and the side wall of the guide sleeve.

3. A headrest rod guide sleeve according to claim 1, characterized in that: The outer wall of the guide sleeve is fixedly provided with a receiving part, and the receiving part is provided with a receiving cavity. The receiving cavity is connected to the inside of the guide sleeve. The limiting block is slidably located in the receiving cavity. A cover is fixed on the receiving part to close the receiving cavity. The elastic element is located between the limiting block and the cover.

4. A headrest rod guide sleeve according to claim 3, characterized in that: The cover is provided with a first snap-fit ​​portion, and the receiving portion is provided with a first snap-fit ​​groove, wherein the first snap-fit ​​portion snaps into the first snap-fit ​​groove; or... The cover is provided with a first snap-fit ​​groove, and the receiving part is provided with a first snap-fit ​​part, which snaps into the first snap-fit ​​groove.

5. A headrest rod guide sleeve according to claim 1, characterized in that: A metal sleeve is fixedly fitted on the outer side of the guide sleeve, and the metal sleeve has a flat portion.

6. A quick-disassembly structure, characterized in that: The headrest rod guide sleeve according to any one of claims 1-5 further includes a first connector that can be connected to the headrest rod and a second connector that can slide within the guide sleeve; the first connector and the second connector can be inserted into each other and can be separated under external force; the side of the second connector is provided with a third guide slope for sliding cooperation with the first guide slope.

7. The quick-disassembly structure according to claim 6, characterized in that: The second connector is fixedly fitted with a limiting spring; the limiting spring is provided with a locking end for locking onto the headrest rod.

8. The quick-disassembly structure according to claim 6, characterized in that: The first connector is integrally provided with a second locking part for locking onto the headrest bar.

9. A music headrest, characterized in that: It includes a headrest rod and a quick-release structure as described in any one of claims 6-8; the first connector is installed at the end of the headrest rod.

10. A seat, characterized in that: Includes the headrest rod guide sleeve as described in any one of claims 1-5; or, Includes a quick-disassembly structure as described in any one of claims 6-8; or, Includes the music headrest as described in claim 9.

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