Telescopic seat frame with automatic opening and closing limiting function and seat

Abstract

The utility model discloses a telescopic seat frame with an automatic opening and closing limit function and a seat. The telescopic seat frame comprises a base, a telescopic adjusting assembly is assembled on the base, and the telescopic adjusting assembly can reciprocate between the front end and the rear end of the base; the lock rod is fixedly connected to the telescopic seat frame; the two limiting assemblies are assembled at the front end and the rear end of the base correspondingly, and the lock rod is connected with any limiting assembly in a matched mode; the locking assembly is assembled on the limiting assembly and can lock the lock rod in the limiting assembly; and the triggering assembly is arranged on the locking assembly. According to the utility model, the locking rod is locked by the locking assembly, so that the displacement of the telescopic adjusting assembly caused by shaking or shaking and the like is effectively avoided, and the locking rod can be propped against the triggering assembly to drive the locking assembly to release the locking effect on the locking rod, so that the automatic opening and closing of the limiting assembly are realized, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, in particular to a telescopic seat frame and a seat with automatic opening and closing limit functions. Background Art

[0002] At present, functional seats can generally meet the user's sitting and lying postures by switching states, and the state switching of the seat depends on the telescopic deformation of the seat frame. In order to ensure smooth telescopic deformation, the friction between the various components inside the seat frame is generally low, especially for seats that switch states manually. This also causes the components inside the seat frame to move easily under conditions such as shaking or swaying, that is, the seat frame may be displaced under the influence of shaking or swaying, resulting in the seat frame being unable to reliably maintain a certain state, and there is a potential safety risk. At present, in order to solve the above problems, it is common to assemble a corresponding limit mechanism on the base of the seat frame, and then the user manually opens or closes the limit mechanism when switching seats to limit the seat frame, which makes the operation cumbersome and easily brings a poor user experience. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art described above, the utility model provides a telescopic seat frame with automatic opening and closing limit, which can realize the automatic opening and closing of the limit assembly, thereby improving the user experience.

[0004] According to an embodiment of the utility model, a telescopic seat frame with automatic opening and closing limit comprises: a base, on which is mounted a telescopic adjustment component, and the telescopic adjustment component can reciprocate between the front end and the rear end of the base; a locking rod, which is fixedly connected to the telescopic seat frame; two limit assemblies, which are respectively mounted on the front end and the rear end of the base, and the locking rod is cooperatively connected to any one of the limit assemblies; a locking assembly, which is mounted on the limit assembly and can lock the locking rod in the limit assembly; a trigger assembly, which is arranged on the locking assembly, and when the locking rod abuts against the trigger assembly, the locking assembly releases the locking effect on the locking rod.

[0005] In the telescopic seat frame with automatic opening and closing limit, the locking rod is locked in the limit assembly by the locking assembly, so that the telescopic adjustment assembly is limited to the front end or the rear end of the base, effectively avoiding the displacement of the telescopic adjustment assembly caused by shaking or swaying, thereby improving the safety of the seat and ensuring that the seat can be stably in the extended state or the stored state. In addition, the locking rod can also abut against the trigger assembly to drive the locking assembly to release the locking effect on the locking rod, so that the telescopic seat frame can switch between the extended state and the stored state again, thereby realizing the automatic opening and closing of the limit assembly and improving the user experience.

[0006] According to some embodiments of the utility model, the limiting assembly includes a limiting frame assembled on the base, the limiting frame is provided with a limiting transverse groove extending along the front-to-back direction, the limiting transverse groove is cooperatively connected with the locking rod, and the locking assembly is assembled on the limiting frame.

[0007] According to some embodiments of the utility model, the locking assembly includes a locking plate rotatably connected to the limiting frame, the locking plate is provided with a locking portion closing the opening of the limiting transverse groove, the trigger assembly is arranged at one end of the locking portion close to the limiting transverse groove, and the end of the locking portion away from the limiting transverse groove is provided with a first guide bevel, and the locking rod can drive the locking portion to open the limiting transverse groove through the first guide bevel.

[0008] According to some embodiments of the utility model, the trigger assembly includes a second guide bevel, which is arranged at one end of the locking portion close to the limiting transverse groove, and the locking rod can drive the locking portion to open the limiting transverse groove through the second guide bevel.

[0009] According to some embodiments of the present invention, a reset elastic member is further included, and the reset elastic member is connected between the limiting frame and the locking plate.

[0010] According to some embodiments of the present invention, a limit pin is further included, wherein the limit pin is arranged at the upper end of the limit frame, and the locking plate or the locking portion is connected to the limit pin.

[0011] According to some embodiments of the utility model, the telescopic adjustment assembly includes an extension bracket, a support frame rod, a slide rail and a seat frame support frame; wherein: the slide rail is mounted on the base and parallel to the telescopic direction, and the seat frame support frame is movably mounted on the slide rail; the extension bracket is hinged between the base and the rear end of the seat frame support frame; the rear end of the support frame rod is fixedly connected to the seat frame support frame, and the front end of the support frame rod is equipped with a pulley set; the locking rod is fixedly connected to the seat frame support frame.

[0012] According to some embodiments of the present invention, the seat frame support frame includes a seat frame support member and an L-shaped transmission member, the rear end of the seat frame support member is fixedly connected to the horizontal section of the L-shaped transmission member, the support frame rod and the locking rod are both fixedly connected to the seat frame support member, the seat frame support member is slidably connected to the slide rail, and the vertical section of the L-shaped transmission member is hinged to the extension bracket.

[0013] According to some embodiments of the utility model, the extension bracket includes a limit link, a backrest fixing rod and an extension plate which are hinged in sequence, the limit link is hinged to the base, the extension plate is hinged to the vertical section of the L-shaped transmission member, and the backrest fixing rod is hinged between the limit link and the extension plate.

[0014] Based on the same inventive concept, the utility model also proposes a seat, including the telescopic seat frame with automatic opening and closing limit as described above.

[0015] In summary, the telescopic seat frame with automatic opening and closing limit provided by the utility model has the following technical effects:

[0016] The locking rod is locked in the limiting assembly by the locking assembly, thereby limiting the telescopic adjustment assembly at the front end or rear end of the base, effectively preventing the displacement of the telescopic adjustment assembly caused by shaking or swaying, thereby improving the safety of the seat and ensuring that the seat can be stably in the extended state or the stored state. In addition, the locking rod can also be abutted against the trigger assembly to drive the locking assembly to release the locking effect on the locking rod, so that the telescopic seat frame can be switched between the extended state and the stored state again, thereby realizing the automatic opening and closing of the limiting assembly and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a telescopic seat frame with automatic opening and closing limit according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of region A;

[0019] Figure 3 for Figure 1 A magnified schematic diagram of region B;

[0020] Figure 4 It is a side view of a telescopic seat frame with automatic opening and closing limit according to an embodiment of the utility model;

[0021] Figure 5 This is a schematic structural diagram of a telescopic adjustment assembly according to an embodiment of the utility model;

[0022] Figure 6Schematic structural diagram of the locking assembly according to an embodiment of the present utility model;

[0023] Figure 7 Another schematic structural diagram of the locking assembly according to an embodiment of the present utility model.

[0024] Among them, the meanings of the reference numerals are as follows:

[0025] 1. Base; 2. Telescopic adjustment assembly; 21. Extension bracket; 211. Limit link; 212. Backrest fixing rod; 213. Extension plate; 22. Support rod; 23. Slide rail; 24. Seat frame support; 241. Seat frame support member; 242. L-shaped transmission member; 25. Pulley group; 3. Locking rod; 4. Limit assembly; 41. Limit frame; 42. Limit horizontal groove; 5. Locking assembly; 51. Locking plate; 52. Locking portion; 53. First guiding bevel; 6. Trigger assembly; 61. Second guiding bevel; 7. Limit pin. Detailed implementation manners

[0026] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model.

[0029] Refer to Figure 1 、 Figure 4 and Figure 5 , the present utility model discloses a telescopic seat frame with automatic opening and closing limit, which is applied to a seat. For the convenience of description, in the present utility model, the telescopic seat frame capable of automatic limit is collectively referred to as the telescopic seat frame. Preferably, the telescopic seat frame can form the main frame of the seat. Further, the state switching of the telescopic seat frame corresponds to the state switching of the seat.

[0030] Refer to Figure 1 、 Figure 2 、 Figure 3 、Figure 4 and Figure 5 In the utility model, the telescopic seat frame with automatic opening and closing limit comprises a base 1, a locking rod 3, two limit assemblies 4, a locking assembly 5 and a trigger assembly 6. In some embodiments, a telescopic adjustment assembly 2 is mounted on the base 1, and the telescopic adjustment assembly 2 can reciprocate between the front end and the rear end of the base 1; the locking rod 3 is fixedly connected to the telescopic seat frame and can move with the telescopic adjustment assembly 2; the two limit assemblies 4 are respectively mounted on the front end and the rear end of the base 1, and the locking rod 3 is cooperatively connected with any of the limit assemblies 4; the locking assembly 5, the locking assembly 5 is mounted on the limit assembly 4, and can lock the locking rod 3 in the limit assembly 4; the trigger assembly 6, the trigger assembly 6 is arranged on the locking assembly 5, and when the locking rod 3 abuts against the trigger assembly 6, the locking assembly 5 releases the locking effect on the locking rod 3. Preferably, the locking rod 3 is locked in the limiting assembly 4 by the locking assembly 5, thereby limiting the telescopic adjustment assembly 2 at the front end or rear end of the base 1, effectively avoiding the displacement of the telescopic adjustment assembly 2 caused by shaking or swaying, thereby improving the safety of the seat and ensuring that the seat can be stably in the extended state or the stored state. In addition, the locking rod 3 can also abut against the trigger assembly 6 to drive the locking assembly 5 to release the locking effect on the locking rod 3, so that the telescopic seat frame can switch between the extended state and the stored state again, thereby realizing the automatic opening and closing of the limiting assembly 4 and improving the user experience.

[0031] See also Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7, in some embodiments, the limiting component 4 includes a limiting frame 41 assembled on the base 1. The limiting frame 41 is provided with a limiting transverse groove 42 extending in the front-rear direction. The limiting transverse groove 42 is cooperatively connected with the locking rod 3, and the locking component 5 is assembled on the limiting frame 41. Preferably, the limiting frames 41 having the limiting transverse grooves 42 are respectively arranged at the front end and the rear end of the base 1. Specifically, the limiting transverse groove 42 extends in the front-rear direction. Preferably, the opening of the limiting transverse groove 42 at the front end of the base 1 faces the rear end, and the opening of the limiting transverse groove 42 at the rear end of the base 1 faces the front end, that is, the opening of the limiting transverse groove 42 at the front end of the base 1 and the opening of the limiting transverse groove 42 at the rear end of the base 1 are arranged facing each other. When the locking rod 3 moves back and forth at the front end or the rear end of the base 1 following the telescopic adjustment component 2, it can directly enter the corresponding limiting transverse groove 42 and be cooperatively connected with the limiting transverse groove 42. Then, the locking component 5 assembled on the limiting frame 41 locks the locking rod 3 cooperatively connected in the limiting transverse groove 42, so as to limit the telescopic adjustment component 2 at the front end or the rear end of the base 1. Optionally, the locking component 5 can be an adsorption element composed of a magnet, an electromagnet, a negative pressure suction cup, etc., that is, the adsorption element adsorbs the locking rod 3 to limit the locking rod 3 in the limiting component 4. Further, the triggering component 6 can be a sensor or a touch switch arranged on the locking component 5. When the locking rod 3 abuts against the triggering component 6, it triggers the power-off of the locking component 5 to release the adsorption effect of the adsorption element on the locking rod 3, or when the locking rod 3 abuts against the triggering component 6, it triggers the change of the current direction of the locking component 5, thereby changing the magnetic field direction and further pushing the locking rod 3 out of the limiting transverse groove 42.

[0032] Refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7In some embodiments, the locking assembly 5 includes a locking plate 51 rotatably connected to the limiting frame 41, the locking plate 51 is provided with a locking portion 52 that closes the opening of the limiting transverse groove 42, the locking assembly 5 is arranged at one end of the locking portion 52 close to the limiting transverse groove 42, and the end of the locking portion 52 away from the limiting transverse groove 42 is provided with a first guide bevel 53, and the locking rod 3 can drive the locking portion 52 to open the limiting transverse groove 42 through the first guide bevel 53. Preferably, when the locking rod 3 follows the telescopic adjustment component 2 to move toward the front end or rear end of the base 1, the locking rod 3 first abuts against the first guiding bevel 53, and under the guiding action of the first guiding bevel 53, the locking rod 3 drives the locking portion 52 to rotate in the direction of opening the limiting transverse groove 42, so that the locking rod 3 can enter the limiting transverse groove 42, and then the locking portion 52 and the locking plate 51 are reset under the action of their own gravity, and the locking portion 52 re-closes the opening of the limiting transverse groove 42, thereby limiting the telescopic adjustment component 2 to the front end or rear end of the base 1, effectively avoiding the displacement of the telescopic adjustment component 2 caused by shaking or swaying, improving the safety of the seat, and ensuring that the seat can be stably in the extended state or the stored state; when the state of the telescopic seat frame is switched again, When the locking rod 3 is in the extended state, the user drives the locking rod 3 to abut against the trigger assembly 6 arranged at one end of the locking portion 52 close to the limiting transverse groove 42, so that the locking assembly 5 releases the locking effect on the locking rod 3, thereby allowing the telescopic seat frame to switch between the extended state and the retracted state again. Optionally, the trigger assembly 6 may include a touch switch and a driving member, wherein the touch switch is arranged at one end of the locking portion 52 close to the limiting transverse groove 42, and the driving member is a motor, an electric cylinder or an electric screw and other devices. When the locking rod 3 abuts against the trigger assembly 6, the trigger driving member drives the locking portion 52 to rotate again in the direction of opening the limiting transverse groove 42, so that the locking rod 3 can leave the limiting transverse groove 42, and the state of the telescopic seat frame can be switched again, thereby realizing the automatic opening and closing of the limiting assembly 4.

[0033] See also Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7, in some embodiments, the trigger assembly 6 includes a second guiding bevel edge 61 disposed at one end of the locking portion 52 close to the limiting transverse groove 42. The locking rod 3 can drive the locking portion 52 to open the limiting transverse groove 42 through the second guiding bevel edge 61. Preferably, when the locking rod 3 moves along with the telescopic adjustment assembly 2 towards the front end or the rear end of the base 1, the locking rod 3 first abuts against the first guiding bevel edge 53. Under the guiding action of the first guiding bevel edge 53, the locking rod 3 drives the locking portion 52 to rotate in the direction of opening the limiting transverse groove 42, so that the locking rod 3 can enter the limiting transverse groove 42. Then, the locking portion 52 and the locking plate 51 reset under the action of their own gravity, and the locking portion 52 re-closes the opening of the limiting transverse groove 42, thereby limiting the telescopic adjustment assembly 2 at the front end or the rear end of the base 1. When the state of the telescopic seat frame is switched again, the user drives the locking rod 3 to abut against the second guiding bevel edge 61 disposed at one end of the locking portion 52 close to the limiting transverse groove 42. Under the guiding action of the second guiding bevel edge 61, the locking rod 3 can drive the locking portion 52 to rotate in the direction of opening the limiting transverse groove 42, so that the locking rod 3 can leave the limiting transverse groove 42, thereby realizing the unlocking effect of the locking assembly 5 on the locking rod 3, enabling the locking rod 3 to leave the limiting transverse groove 42, and then the state of the telescopic seat frame can be switched again, and further realizing the automatic opening and closing of the limiting assembly 4.

[0034] Refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7In some embodiments, a reset elastic member is further included, and the reset elastic member is connected between the limit frame 41 and the locking plate 51. Preferably, the reset elastic member is a spring or a coil spring, one end of the reset elastic member is assembled on the limit frame 41, and the other end of the reset elastic member is assembled on the locking plate 51; preferably, when the locking rod 3 follows the telescopic adjustment assembly 2 to move toward the front end or rear end of the base 1, the locking rod 3 first abuts against the first guide bevel 53, and under the guiding action of the first guide bevel 53, the locking rod 3 drives the locking portion 52 to rotate in the direction of opening the limit transverse groove 42, and at the same time drives the reset elastic member to undergo elastic deformation. When the locking rod 3 enters the limit transverse groove 42, the reset elastic member recovers the deformation, driving the locking portion 52 to reset and re-close the opening of the limit transverse groove 42. At this time, the elastic force of the reset elastic member acting on the locking plate 51 can further strengthen the locking of the locking portion 52 on the locking rod 3. , ensuring that the seat is more stably in the extended state or the stored state, preventing shaking or swaying from causing the locking rod 3 to abut against the second guide bevel 61, thereby causing the locking assembly 5 to release the locking effect of the locking rod 3; when the state of the telescopic seat frame is switched again, the locking rod 3 is driven to abut against the second guide bevel 61, and the force applied to the locking portion 52 by the locking rod 3 is greater than the elastic force of the reset elastic member, so that the locking rod 3 can drive the locking portion 52 to rotate in the direction of opening the limiting transverse groove 42 under the guiding action of the second guide bevel 61, so that it can leave the limiting transverse groove 42, thereby realizing the release of the locking effect of the locking assembly 5 on the locking rod 3, so that the locking rod 3 can leave the limiting transverse groove 42, and the state of the telescopic seat frame can be switched again, thereby realizing the automatic opening and closing of the limiting assembly 4.

[0035] See also Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 In some embodiments, a limit pin 7 is further included, wherein the limit pin 7 is disposed at the upper end of the limit frame 41, and the locking plate 51 or the locking portion 52 is connected to the limit pin 7. Figure 7, the limit pin 7 is fixedly connected to the locking part 52 and abuts against the upper end of the limit frame 41. Specifically, when the lock rod 3 enters the limit transverse groove 42, the lock rod 3 drives the locking part 52 to drive the limit pin 7 to rotate upward through the first guiding bevel edge 53. After the lock rod 3 enters the limit transverse groove 42, the reset elastic member drives the locking part 52 to drive the limit pin 7 to rotate downward, so that the limit pin 7 abuts against the upper end of the limit frame 41, thereby limiting the downward rotation amplitude of the locking part 52 and preventing the locking part 52 from rotating excessively and affecting the normal opening and closing of the limit transverse groove 42. Optionally, refer to Figure 6 , the limit pin 7 is fixedly connected to the upper end of the limit frame 41 and abuts against the upper end of the locking plate 51 or the locking part 52. Specifically, when the lock rod 3 enters the limit transverse groove 42, the lock rod 3 drives the locking part 52 to rotate downward through the first guiding bevel edge 53. After the lock rod 3 enters the limit transverse groove 42, the reset elastic member drives the locking part 52 to rotate upward, so that the limit pin 7 abuts against the upper end of the locking part 52, thereby limiting the upward rotation amplitude of the locking part 52 and preventing the locking part 52 from rotating excessively and affecting the normal opening and closing of the limit transverse groove 42.

[0036] Refer to Figure 1 , Figure 4 and Figure 5, in some embodiments, the telescopic adjustment assembly 2 includes an extension bracket 21, a support rod 22, a slide rail 23 and a seat frame support 24; wherein: the slide rail 23 is assembled on the base 1 and is parallel to the telescopic direction, and the seat frame support 24 is movably assembled on the slide rail 23; the extension bracket 21 is hinged between the base 1 and the rear end of the seat frame support 24; the rear end of the support rod 22 is fixedly connected to the seat frame support 24, and a pulley set 25 is assembled at the front end of the support rod 22; the locking rod 3 is fixedly connected to the seat frame support 24. Further, a plurality of rollers are rollably connected in the slide rail 23, and the rollers are assembled on the seat frame support 24, which can greatly reduce the established resistance of the seat frame support 24 to reciprocate along the slide rail 23, so as to facilitate the user to manually push and pull the seat frame support 24, and further realize manually driving the telescopic seat frame to switch between the extended state and the retracted state. When the seat frame support 24 reciprocates along the slide rail 23, the extension bracket 21 can be extended or retracted under the traction of the seat frame support 24, so as to change the length of the telescopic seat frame. Optionally, the support rod 22 serves as an extension of the seat frame support 24 in the telescopic direction, which can further increase the length of the telescopic seat frame. At the same time, the pulley set 25 at the front end of the support rod 22 is used to enable the support rod 22 to smoothly move with the seat frame support 24, reducing the external established resistance when the telescopic seat frame switches between the extended state and the retracted state, so as to facilitate the user to manually push and pull the telescopic seat frame to switch between the extended state and the retracted state. Specifically, when the telescopic seat frame switches from the retracted state to the extended state, the seat frame support 24 moves forward along the slide rail 23. At the same time, the seat frame support 24 pulls the extension bracket 21 to extend, driving the telescopic seat frame in the extended state to have a greater length. And the support rod 22, which is an extension of the seat frame support 24 in the telescopic direction, synchronously moves forward with the seat frame support 24, further increasing the length of the telescopic seat frame, so that the bed formed by switching the seat has a greater length, bringing a more comfortable lying posture experience to the user.

[0037] In some embodiments, an armrest is further included. The armrest is fixedly connected to the base 1, and the limiting assembly 4 is assembled on the armrest. Optionally, armrests are provided on both the left and right sides of the base 1 to avoid personnel falling accidents. Optionally, both of the two limiting assemblies 4 are assembled on the armrest to facilitate user operation and maintenance.

[0038] See Figure 1 、 Figure 4 and Figure 5, in some embodiments, the seat frame support 24 includes a seat frame support member 241 and an L-shaped transmission member 242. The rear end of the seat frame support member 241 is fixedly connected to the horizontal section of the L-shaped transmission member 242. The support rod 22 and the lock rod 3 are both fixedly connected to the seat frame support member 241. The seat frame support member 241 is slidably connected to the slide rail 23. The vertical section of the L-shaped transmission member 242 is hinged to the extension bracket 21. Further, a seat cushion is assembled on the seat frame support member 241; optionally, the L-shaped transmission member 242 is arranged in an L shape. Preferably, the horizontal section of the L-shaped transmission member 242 is located at the front end, and the vertical section of the L-shaped transmission member 242 is located at the rear end; wherein the extension bracket 21 is hinged between the base 1 and the vertical section of the L-shaped transmission member 242. When the telescopic seat frame is switched from the storage state to the extended state, it can effectively avoid excessive interference between the seat cushion assembled on the seat frame support 24 and the extension bracket 21, and can further drive the seat cushion to fit against the vertical section of the L-shaped transmission member 242. Furthermore, it is beneficial to reduce the gap between the seat cushion in the extended state and the extension pad assembled on the extension bracket 21, effectively improving the comfort of the seat.

[0039] Refer to Figure 1 , Figure 4 and Figure 5, in some embodiments, the extension bracket 21 includes a limit link 211, a backrest fixing rod 212, and an extension plate 213 that are sequentially hinged. The limit link 211 is hinged to the base 1, the extension plate 213 is hinged to the vertical section of the L-shaped transmission member 242, and the backrest fixing rod 212 is hinged between the limit link 211 and the extension plate 213. Further, the backrest fixing rod 212 is equipped with an extension pad; specifically, the L-shaped transmission member 242 can drive the backrest fixing rod 212 more stably through the extension plate 213, and at the same time, the height of the L-shaped transmission member 242 can be reduced through the extension plate 213, so that the L-shaped transmission member 242 with a smaller height is connected to the backrest fixing rod 212 through the extension plate 213 at a connection point height to achieve labor saving, and the risk of interference between the L-shaped transmission member 242 with too high a height and the extension pad II can be eliminated. At the same time, the height of the backrest fixing rod 212 can be increased, so that the telescopic seat frame in the extended state has a greater length, that is, the bed switched from the seat has a greater length, bringing a more comfortable lying posture experience to the user. It also means that an extension pad with a longer length can be assembled within an appropriate range without affecting the structural stability of the seat, which is beneficial to obtaining a greater seat depth when the seat is in the extended state, thus realizing the functional transformation from the seat to the bed. Further, there can be multiple extension plates 213, and the multiple extension plates 213 are sequentially hinged; at the same time, when the telescopic seat frame is in the extended state, the extension plate 213 can cooperate with the backrest fixing rod 212 to provide a longitudinal supporting force for the extension pad II, thereby effectively ensuring the structural stability of the seat.

[0040] In some embodiments, a seat includes a telescopic seat frame with automatic opening and closing limit as described above. Optionally, a seat cushion is assembled on the seat frame support 241, an extension pad is assembled on the backrest fixing rod 212, and a backrest cushion is assembled at the rear end of the base 1. Further, the backrest cushion is assembled at the rear end and is located above the seat cushion and the extension pad; the space at the rear of the lower side of the backrest cushion is the storage area; when the telescopic seat frame is in the storage state, the extension pad and at least part of the seat cushion are in the storage area; when the telescopic seat frame is in the extended state, the extension pad and the seat cushion are separated from the storage area, and the working surfaces of the extension pad and the seat cushion are flush.

[0041] Refer to Figures 1 - 7, in some embodiments, when the telescopic seat frame switches between the retracted state and the extended state, the seat frame support 24 moves along the slide rail 23. At the same time, the seat frame support 24 pulls the extension bracket 21 to extend or retract. Meanwhile, the support rod 22, which is the extension of the seat frame support 24 in the telescopic direction, and the locking rod 3 fixedly connected to the seat frame support 24 both move synchronously with the seat frame support 24. When the locking rod 3 reaches the front end or the rear end, the locking rod 3 first abuts against the first guiding bevel edge 53. Under the guiding action of the first guiding bevel edge 53, the locking rod 3 drives the locking portion 52 to rotate in the direction of opening the limiting transverse groove 42 and enter the limiting transverse groove 42. At the same time, the reset elastic member is elastically deformed. When the locking rod 3 enters the limiting transverse groove 42, the reset elastic member recovers its deformation and drives the locking portion 52 to reset, re-closing the opening of the limiting transverse groove 42. At this time, the elastic force of the reset elastic member acting on the locking plate 51 can further strengthen the locking of the locking portion 52 on the locking rod 3, ensuring that the seat is more stably in the extended state or the retracted state, preventing the locking rod 3 from abutting against the second guiding bevel edge 61 due to shaking or wobbling, etc., which may cause the locking assembly 5 to release the locking effect on the locking rod 3. When the state of the telescopic seat frame is switched again, the locking rod 3 is driven to abut against the second guiding bevel edge 61, and the force applied by the locking rod 3 to the locking portion 52 is greater than the elastic force of the reset elastic member, so that the locking rod 3 can drive the locking portion 52 to rotate in the direction of opening the limiting transverse groove 42 under the guiding action of the second guiding bevel edge 61, so as to be able to leave the limiting transverse groove 42, thereby realizing the release of the locking effect of the locking assembly 5 on the locking rod 3, enabling the locking rod 3 to leave the limiting transverse groove 42, and then the state of the telescopic seat frame can be switched again, thus realizing the automatic opening and closing of the limiting assembly 4.

[0042] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include the technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A telescopic seat frame with automatic opening / closing and limiting function, characterized in that, Comprising: A base (1) on which a telescopic adjustment assembly (2) is assembled, and the telescopic adjustment assembly (2) can reciprocate between the front end and the rear end of the base (1); A locking rod (3) fixedly connected to the telescopic seat frame; Two limiting assemblies (4) respectively assembled at the front end and the rear end of the base (1), and the locking rod (3) is cooperatively connected with any one of the limiting assemblies (4); A locking component (5) assembled on the limiting assembly (4) and capable of locking the locking rod (3) within the limiting assembly (4); A triggering component (6) arranged on the locking component (5), and when the locking rod (3) abuts against the triggering component (6), the locking component (5) releases the locking effect on the locking rod (3).

2. The telescopic seat frame with automatic opening / closing limit according to claim 1, characterized in that: The limiting assembly (4) includes a limiting frame (41) assembled on the base (1), the limiting frame (41) is provided with a limiting transverse groove (42) extending in the front-rear direction, the limiting transverse groove (42) is cooperatively connected with the locking rod (3), and the locking component (5) is assembled on the limiting frame (41).

3. The telescopic seat frame with automatic opening / closing limit according to claim 2, characterized in that: The locking component (5) includes a locking plate (51) rotatably connected to the limiting frame (41), the locking plate (51) is provided with a locking portion (52) closing the opening of the limiting transverse groove (42), the triggering component (6) is arranged at one end of the locking portion (52) close to the limiting transverse groove (42), and a first guiding bevel edge (53) is arranged at one end of the locking portion (52) far from the limiting transverse groove (42), and the locking rod (3) can drive the locking portion (52) to open the limiting transverse groove (42) through the first guiding bevel edge (53).

4. The telescopic seat frame with automatic opening / closing and limiting according to claim 3, characterized in that: The triggering component (6) includes a second guiding bevel edge (61) arranged at one end of the locking portion (52) close to the limiting transverse groove (42), and the locking rod (3) can drive the locking portion (52) to open the limiting transverse groove (42) through the second guiding bevel edge (61).

5. The telescopic seat frame with automatic opening / closing limit according to claim 3, characterized in that: Further comprising a reset elastic member connected between the limiting frame (41) and the locking plate (51).

6. The telescopic seat frame with automatic opening / closing limit according to claim 5, wherein: Further comprising a limiting pin (7) arranged at the upper end of the limiting frame (41), and the locking plate (51) or the locking portion (52) is connected to the limiting pin (7).

7. The telescopic seat frame with automatic opening / closing and limiting according to any one of claims 1-6, characterized in that: The telescopic adjustment assembly (2) includes an extension bracket (21), a support rod (22), a slide rail (23) and a seat frame support (24); wherein: The slide rail (23) is assembled on the base (1) and is parallel to the telescopic direction, and the seat frame support (24) is movably assembled on the slide rail (23); The extension bracket (21) is hinged between the base (1) and the rear end of the seat frame support (24); The rear end of the support rod (22) is fixedly connected to the seat frame support (24), and a pulley set (25) is assembled at the front end of the support rod (22); The lock rod (3) is fixedly connected to the seat frame support bracket (24).

8. The telescopic seat frame with automatic opening / closing limit according to claim 7, characterized in that: The seat frame support bracket (24) includes a seat frame support member (241) and an L-shaped transmission member (242). The rear end of the seat frame support member (241) is fixedly connected to the horizontal section of the L-shaped transmission member (242). The support frame rod (22) and the lock rod (3) are both fixedly connected to the seat frame support member (241). The seat frame support member (241) is slidably connected to the slide rail (23). The vertical section of the L-shaped transmission member (242) is hinged to the extension bracket (21).

9. The telescopic seat frame with automatic opening and closing limit according to claim 8, wherein: The extension bracket (21) includes a limit link (211), a backrest fixing rod (212), and an extension plate (213) that are sequentially hinged. The limit link (211) is hinged to the base (1). The extension plate (213) is hinged to the vertical section of the L-shaped transmission member (242). The backrest fixing rod (212) is hinged between the limit link (211) and the extension plate (213).

10. A seat, characterized in that, It includes a telescopic seat frame with automatic opening and closing limit as described in any one of claims 1-9.

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