Seat

Abstract

The utility model discloses a seat, which comprises a seat frame, a seat cushion and a seat cushion, the front portion of the supporting frame is rotationally connected to the front portion of the connecting base, and the rear portion of the supporting frame extends to the rear portion of the connecting base; the backrest is rotationally connected to the rear part of the supporting frame; the two ends of the telescopic rod are rotationally connected to the bottom of the backrest and the rear portion of the connecting base respectively, a locking structure is arranged on the telescopic rod, and the locking structure can relieve or limit stretching and retracting of the telescopic rod; according to the chair, the telescopic rod is used for stably supporting the backrest, so that the backrest can lean backwards by a certain angle, the safety and the stability of the backrest when the backrest leans backwards for use are improved, and the overall practicability is higher.

Description

Technical Field

[0001] This utility model relates to a type of furniture, and more particularly to a chair. Background Technology

[0002] There are various types of chairs. Some chairs have fixed backrests. To improve comfort, some chairs have backrests with a flexible, reclining structure. When a person leans against the backrest, it can elastically deform backward to improve comfort. Other chairs, to increase the reclining angle, have the backrest directly hinged to the seat. This allows for greater freedom of rotation, but it reduces the support for the backrest and makes the hinge prone to loosening and damage. Therefore, there is an urgent need for a chair that can increase the reclining angle and has a stable structure. Utility Model Content

[0003] The purpose of this utility model is to provide a seat to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is:

[0005] A seat includes: a seat frame with a connecting seat on its top side; a support frame rotatably connected to the front of the connecting seat at its front end, and the rear end of the support frame extending to the rear of the connecting seat; a backrest rotatably connected to the rear of the support frame; a telescopic rod rotatably connected at both ends to the bottom of the backrest and the rear of the connecting seat, respectively, the telescopic rod having a locking structure that can release or restrict the extension and retraction of the telescopic rod; and a seat plate connected to the support frame and located above the connecting seat.

[0006] This technical solution has at least the following beneficial effects: The backrest is rotatably connected to the rear of the support unit and connected between the bottom of the backrest and the rear of the connecting seat via a telescopic rod, providing support for the backrest. The user can sit on the seat board. When the backrest needs to be fixed relative to the seat board, a locking structure restricts the extension and retraction of the telescopic rod. At this time, due to the restriction of the telescopic rod, the position of the backrest can be maintained. When the backrest needs to rotate relative to the seat board, the locking structure releases the extension and retraction of the telescopic rod, and the user leans back against the backrest. At this time, the support frame can rotate around its front, with the position connected to the connecting seat as the fulcrum for rotation. As it rotates forward, the telescopic rod retracts, and the backrest tilts backward. The extension and retraction of the telescopic rod provides rotational movement for the backrest and provides stable support for it. In this process, because the support frame drives the seat board to rotate, the center of gravity of the human body remains above the connecting seat, so that the entire seat will not flip backward when the user leans back against the backrest. In this way, not only does the telescopic rod provide stable support for the backrest, allowing the backrest to tilt backward at a certain angle, but it also improves the safety and stability of the backrest when tilting back, making it more practical overall.

[0007] As a further improvement to the above technical solution, the telescopic rod includes a main sleeve, a sub-sleeve, a first spring, and a rod body. The top end of the main sleeve is rotatably connected to the bottom of the backrest, and the bottom end of the rod body is rotatably connected to the rear of the connecting seat. A first limiting ring is formed on the outer side of the bottom of the rod body. The bottom of the sub-sleeve is sleeved on the outer side of the rod body and abuts against the first limiting ring. The top of the sub-sleeve is inserted into the main sleeve. A limiting rib is provided on the outer side of the sub-sleeve. An avoidance groove is provided on the inner side of the main sleeve for the limiting rib to be inserted. A second limiting ring is formed on the outer side of the main sleeve. The first spring is sleeved on the outer sides of the main sleeve and the sub-sleeve. The two ends of the first spring abut against the first limiting ring and the second limiting ring, respectively. The locking structure can drive the sub-sleeve to rotate so that the limiting rib and the avoidance groove are directly opposite each other or staggered. When the backrest needs to be fixed relative to the seat plate, the locking structure drives the sub-sleeve to rotate, causing the limiting rib and the clearance groove to be misaligned. Since the limiting rib cannot enter the clearance groove, its top end can only abut against the bottom of the sub-sleeve, restricting the sub-sleeve from entering the main sleeve. This limits the retraction of the telescopic rod. When the backrest needs to recline, the locking structure drives the sub-sleeve to rotate, causing the limiting rib and the clearance groove to be directly aligned. In this case, the limiting rib can enter the clearance groove, allowing the sub-sleeve to be inserted into or removed from the main sleeve. This allows the front part of the support frame to rotate around the position where it is connected to the connecting seat, causing the backrest to tilt back. When the sub-sleeve is inserted into the main sleeve, the first spring located between the first and second limiting rings is elastically compressed, thereby providing elastic support to the human body and improving comfort. In this way, the locking structure drives the sub-sleeve to rotate, so that the limiting rib and the clearance groove are aligned to release the restriction on the telescopic rod, or so that the limiting rib and the clearance groove are staggered to restrict the extension and retraction of the telescopic rod.

[0008] As a further improvement to the above technical solution, the locking structure includes a driving part, a fixing block, a second spring, and a lever. The fixing block is formed on the outside of the rod body, the lever is formed at the bottom of the sub-sleeve, the second spring is disposed between the fixing block and the lever, and the second spring has a tendency to push the lever away from the fixing block. The driving part is disposed on the fixing block and drives the lever. The driving part can drive the lever closer to the fixing block, and the clearance groove is directly opposite the rotation path of the limiting rib. When it is necessary to align or offset the limiting rib and the clearance groove, the drive unit can drive the lever block closer to the fixed block, thereby causing the sub-sleeve to rotate relative to the main sleeve. At this time, the second spring located between the fixed block and the lever block is in a compressed state. Alternatively, if the driving force of the drive unit on the lever block is removed, the elastic restoring force of the second spring can push the lever block away from the fixed block, thereby causing the sub-sleeve to rotate in the opposite direction relative to the main sleeve. In the process of repeatedly rotating the sub-sleeve relative to the main sleeve, the limiting rib and the clearance groove can be aligned or offset, thereby limiting or releasing the telescopic rod's telescopic function.

[0009] As a further improvement to the above technical solution, the drive unit includes a pull rope, and a transmission block is rotatably connected to the base plate. One end of the pull rope passes through the fixed block and the second spring and is connected to the lever block, while the other end of the pull rope is connected to the transmission block. When it is necessary to drive the lever block to rotate toward the fixed block, the user can apply force to the transmission block on the base plate and rotate the transmission block. At this time, the transmission block provides a driving force to the lever block to move toward the fixed block through the pull rope, which can easily achieve manual control.

[0010] As a further improvement to the above technical solution, a fixed seat is formed near the transmission block on the seat plate. A retaining rib is provided on the transmission block, and a retaining groove is provided on the fixed seat. The transmission block can rotate and drive the retaining rib into or out of the retaining groove. When the retaining rib enters the retaining groove, the lever is close to the fixed block. When it is necessary to drive the lever to rotate towards the fixed block, the user rotates the transmission block. At this time, a pulling rope can provide a driving force to the lever to move towards the fixed block. When the lever moves to a position near the end of the fixed block's stroke, the retaining rib on the transmission block enters the retaining groove. The interaction between the retaining rib and the retaining groove maintains the position of the transmission block, thereby maintaining the relative state of the limiting rib and the clearance groove. When it is necessary to change the function of the backrest, the user can apply force to the transmission block, causing it to rotate and disengage the retaining rib from the retaining groove. Thus, by restricting the rotation state of the transmission block, the function of the backrest can be easily maintained, improving the user experience.

[0011] As a further improvement to the above technical solution, a notch is provided on the first limiting ring, the lever extends into the notch, the fixing block is located on one side of the notch, and the second spring has a tendency to push the lever towards the other side of the notch. The notch on the first limiting ring can provide avoidance and travel limit functions for the lever. When the lever rotates to one side of the notch, it rotates closer to the fixing block. When the lever moves to the other side of the notch, the first limiting ring limits the movement of the lever, preventing the restoring force of the second spring from pushing the lever away too far, thus ensuring the stability of the connection between the pull rope and the lever.

[0012] As a further improvement to the above technical solution, when the lever is away from the fixed block, the limiting rib is directly opposite the clearance groove. When the restoring force of the second spring pushes the lever away from the fixed block, since the limiting rib is directly opposite the clearance groove, the position of the lever can be maintained without applying external force, allowing the telescopic rod to achieve normal telescopic function.

[0013] As a further improvement to the above technical solution, an upper protective shell is rotatably connected to the bottom of the backrest, and a lower protective shell is rotatably connected to the rear of the connecting seat. The top of the lower protective shell is inserted into the bottom of the upper protective shell, and the telescopic rod is located inside the upper and lower protective shells. The upper and lower protective shells form a telescopic structure that protects the telescopic rod. When the backrest is tilted back, the telescopic rod shortens, and the top of the lower protective shell is further inserted into the upper protective shell. When the backrest returns to its upright position, the telescopic rod extends, and the top of the lower protective shell gradually moves out of the upper protective shell. This provides effective protection for the transmission structure and helps extend the overall service life.

[0014] As a further improvement to the above technical solution, the front two sides of the support frame form upwardly extending support arms. Two support arms are rotatably connected to both sides of the seat plate. Armrests are rotatably connected to both sides of the seat plate behind the two support arms. The bottoms of the two armrests bypass the bottom side of the connecting seat and connect to each other. A connecting groove is provided at the connection point of the two armrests. A protrusion that can enter the connecting groove is provided on the bottom side of the connecting seat, and the rear part of the protrusion is rotatably connected to the connecting groove. The seat plate provides stable support through its connection with the support plate and armrests. When the backrest is fixed relative to the seat plate, the protrusion on the bottom side of the connecting seat does not fully rotate into the connecting groove at the connection point of the two armrests. When the backrest tilts back relative to the seat plate, the seat plate rotates, causing the two armrests to rotate relative to each other. At this time, the protrusion further rotates into the connecting groove. When the backrest tilts back relative to the seat plate to the end of its travel, the protrusion fully enters the connecting groove. Thus, the protrusion engaging with the connecting groove forms a limiting point, providing a fulcrum for travel limitation and further improving the overall structural stability when using the backrest tilting function.

[0015] As a further improvement to the above technical solution, the support frame is provided with a clearance opening corresponding to the position of the connecting seat. The connecting seat is located within the clearance opening of the support frame, making the overall structure more stable and compact. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional view of the entire utility model.

[0018] Figure 2 This is a perspective view of the present invention with the upper and lower protective shells removed.

[0019] Figure 3 yes Figure 2 A magnified schematic diagram of part A.

[0020] Figure 4 This is a perspective view of the handrail, seat, and connecting seat of this utility model after separation.

[0021] Figure 5 This is a three-dimensional view of the transmission block of this utility model after it has been separated from the base plate.

[0022] In the attached diagram: 100-seat frame, 110-connecting seat, 111-protrusion, 112-clearance opening, 200-support frame, 210-support arm, 300-backrest, 400-telescopic rod, 410-main sleeve, 411-second limiting ring, 420-sub-sleeve, 421-limiting rib, 430-first spring, 440-rod body, 441-first limiting ring, 442-notch, 451-fixing block, 452-second spring, 453-pull block, 454-pull rope, 455-transmission block, 456-fixing seat, 457-clamping rib, 458-clamping groove, 461-upper protective shell, 462-lower protective shell, 500-seat plate, 600-armrest, 610-connecting groove. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Reference Figure 1 and Figure 2 A seat includes a seat frame 100, a support frame 200, a backrest 300, a telescopic rod 400, and a seat plate 500. A connecting seat 110 is provided on the top side of the seat frame 100. The front part of the support frame 200 is rotatably connected to the front part of the connecting seat 110, and the axis of rotation of the support frame 200 rotatably connected to the connecting seat 110 extends in a left-right direction. The rear part of the support frame 200 extends to the rear of the connecting seat 110. The backrest 300 is rotatably connected to the rear part of the support frame 200. The axis of rotation extends in the left and right direction; the two ends of the telescopic rod 400 are respectively rotatably connected to the bottom of the backrest 300 and the rear of the connecting seat 110. The axis of rotation at both ends of the telescopic rod 400 extends in the left and right direction. The telescopic rod 400 is provided with a locking structure, which can release or restrict the extension and retraction of the telescopic rod 400; the seat plate 500 is connected to the support frame 200. Naturally, the support frame 200 has a structure that extends upward to above the seat plate 500, so that the seat plate 500 is located above the connecting seat 110.

[0028] As described above, the backrest 300 is rotatably connected to the rear of the support unit and is connected between the bottom of the backrest 300 and the rear of the connecting seat 110 via a telescopic rod 400, providing support for the backrest 300. The user can sit on the seat 500. When the backrest 300 needs to be fixed relative to the seat 500, the extension and retraction of the telescopic rod 400 is restricted by a locking structure. At this time, the position of the backrest 300 can be maintained due to the restriction of the telescopic rod 400. When the backrest 300 needs to rotate relative to the seat 500, the extension and retraction of the telescopic rod 400 is released by the locking structure, and the user leans back against the backrest 300. At this time, the support frame 200 can rotate around its front and is connected to the connecting seat 110. The position serves as the pivot point for rotation, causing the telescopic rod 400 to retract and the backrest 300 to tilt backward. The extension and retraction of the telescopic rod 400 provides rotational movement for the backrest 300 and offers stable support. During this process, the support frame 200 drives the seat plate 500 to rotate, keeping the user's center of gravity above the connecting seat 110. This prevents the entire seat from flipping backward when the user leans back against the backrest 300. In this way, the telescopic rod 400 not only provides stable support for the backrest 300, allowing it to tilt backward at a certain angle, but also improves the safety and stability of the backrest 300 when tilted back, resulting in greater overall practicality.

[0029] The telescopic rod 400 can be used for telescopic adjustment. Various structural forms can be used to lock or unlock its telescopic movement. For example, a positioning element can be directly inserted into the telescopic rod 400 to restrict its telescopic movement. In this embodiment, for instance... Figure 3As shown, the telescopic rod 400 includes a main sleeve 410, a sub-sleeve 420, a first spring 430, and a rod body 440. The top end of the main sleeve 410 is rotatably connected to the bottom of the backrest 300, and the rotation axis of the top end of the main sleeve 410 extends in the left-right direction. The bottom end of the rod body 440 is rotatably connected to the rear of the connecting seat 110, and the rotation axis of the bottom end of the rod body 440 extends in the left-right direction. A first limiting ring 441 is formed on the outer side of the bottom of the rod body 440. The bottom of the sub-sleeve 420 is sleeved on the outer side of the rod body 440 and abuts against the first limiting ring 441. The top end of the sub-sleeve 420 is inserted into the main sleeve 410. A limiting rib 421 is provided on the outer side of the sub-sleeve 420, and the limiting rib 421 extends along the axial direction of the sub-sleeve 420. The main sleeve 410 has an inner groove for inserting the limiting rib 421, and a second limiting ring 411 is formed on the outer side of the main sleeve 410. The first spring 430 is sleeved on the outer side of the main sleeve 410 and the sub-sleeve 420, with the two ends of the first spring 430 abutting against the first limiting ring 441 and the second limiting ring 411 respectively. The locking structure can drive the sub-sleeve 420 to rotate so that the limiting rib 421 and the limiting groove are directly opposite or staggered. In practical applications, there can be multiple limiting ribs 421. For example, there are two limiting ribs 421. Correspondingly, there are two limiting grooves on the inner side of the main sleeve 410. The two limiting ribs 421 can be directly opposite or staggered with the two limiting grooves respectively.

[0030] When the aforementioned telescopic structure provides support for the backrest 300, when the backrest 300 needs to be fixed relative to the seat plate 500, the locking structure drives the sub-sleeve 420 to rotate so that the limiting rib 421 and the clearance groove are misaligned. At this time, since the limiting rib 421 cannot enter the clearance groove, it can only use its top end to abut against the bottom end of the sub-sleeve 420 to restrict the sub-sleeve 420 from entering the main sleeve 410, thus restricting the retraction movement of the telescopic rod 400. When the backrest 300 needs to recline, the locking structure drives the sub-sleeve 420 to rotate so that the limiting rib 421 and the clearance groove are directly opposite each other. At this time, since the limiting rib 421 can enter the clearance groove, the sub-sleeve 420 can recline relative to the main sleeve 410. When the main sleeve 410 is inserted or removed, the front part of the support frame 200 can rotate around the position where it is rotatably connected to the connecting seat 110, causing the backrest 300 to tilt backward. When the sub-sleeve 420 is inserted relative to the main sleeve 410, the first spring 430 located between the first limiting ring 441 and the second limiting ring 411 is elastically compressed, thereby allowing the backrest 300 to provide elastic support to the human body and improve the comfort of use. In this way, the locking structure drives the sub-sleeve 420 to rotate, so that the limiting rib 421 and the clearance groove are directly opposite each other to release the restriction on the telescopic rod 400, or so that the limiting rib 421 and the clearance groove are staggered to restrict the extension and retraction of the telescopic rod 400.

[0031] The locking structure is mainly used to drive the sub-sleeve 420 to rotate relative to the main sleeve 410. It can take various forms; for example, it can be driven by a rotary cylinder, motor, or other drive source. By directly driving the sub-sleeve 420 to rotate, the limiting rib 421 on the outer side of the sub-sleeve 420 and the clearance groove on the inner side of the main sleeve 410 are either directly opposite or offset. In this embodiment, the locking structure includes a drive unit, a fixing block 451, a second spring 452, and a lever 453. The fixing block 451 is formed on the rod body 44. On the outer side, the lever 453 is formed at the bottom of the sub-sleeve 420. The second spring 452 is disposed between the fixed block 451 and the lever 453. The second spring 452 has a tendency to push the lever 453 away from the fixed block 451. The driving part is disposed on the fixed block 451. The driving part drives the lever 453. The driving part can drive the lever 453 closer to the fixed block 451. The clearance groove is directly opposite the rotation path of the limiting rib 421. When it is necessary to drive the limiting rib 421 and the clearance groove to be aligned or offset, the driving unit can drive the lever 453 to approach the fixed block 451, thereby driving the sub-sleeve 420 to rotate relative to the main sleeve 410. At this time, the second spring 452 located between the fixed block 451 and the lever 453 is in a compressed state. Alternatively, if the driving force of the driving unit on the lever 453 is removed, the elastic restoring force of the second spring 452 can push the lever 453 away from the fixed block 451, thereby driving the sub-sleeve 420 to rotate in the opposite direction relative to the main sleeve 410. In the process of repeatedly driving the sub-sleeve 421 to rotate relative to the main sleeve 410, the limiting rib 421 and the clearance groove can be aligned or offset, thereby limiting or releasing the telescopic function of the telescopic rod 400.

[0032] The drive unit mainly provides pulling force to the lever 453 to bring it closer to the fixed block 451. Its structure can take many forms; for example, the drive unit can use a linear drive source such as a cylinder or electric lead screw, or a structure that applies force manually, such as a pull rod. In order to reduce the number of drive sources and facilitate arrangement, in this embodiment, the drive unit includes a pull rope 454. A transmission block 455 is rotatably connected to the seat plate 500. The transmission block 455 can be connected to the outer side of the seat plate 500, or it can be connected to the bottom side of the seat plate 500, thereby improving the overall appearance. One end of the pull rope 454 passes through the fixed block 451 and the second spring 452 and is connected to the lever 453. The other end of the pull rope 454 is connected to the transmission block 455. When it is necessary to drive the lever 453 to rotate toward the fixed block 451, the user can apply force to the transmission block 455 on the seat plate 500 and rotate the transmission block 455. At this time, the transmission block 455 provides a driving force to the lever 453 to move toward the fixed block 451 through the pull rope 454, which can easily realize manual control.

[0033] In practical applications, an opening is provided on the rear side of the connecting seat 110, directly opposite the telescopic rod 400. The pull rope 454 can enter the connecting seat 110 through the opening and exit from the top side of the connecting seat 110, connecting to the transmission block 455. To ensure that the pull rope 454 can be effectively pulled when the transmission block 455 rotates, the position of the pull rope 454 connected to the transmission block 455 is offset from the rotation axis of the transmission block 455 rotatably connected to the seat plate 500, so that when the transmission block 455 is rotated, the pull rope 454 can effectively pull the lever block 453. To better protect the pull rope 454, a wire protective sleeve can be fitted on the outside of the pull rope 454. In addition, to facilitate fixing both ends of the pull rope 454 to the fixing block 451 and the transmission block 455 respectively, connecting balls can be connected to both ends of the pull rope 454. Anti-detachment grooves are provided on the side of the fixing block 451 and the transmission block 455 away from the pull rope 454. Transition grooves communicating with the anti-detachment grooves are provided on the outside of the fixing block 451 and the transmission block 455 respectively. The pull rope 454 enters the anti-detachment groove from the transition groove, driving the connecting ball to embed into the anti-detachment groove. During use, since the pull rope 454 is in a taut state, it is difficult to remove the connecting ball from the anti-detachment groove.

[0034] Since the first spring 430 has a tendency to push the toggle block 453 away from the fixed block 451, in order to ensure that the toggle block 453 is close to the fixed block 451, in this embodiment, as follows: Figure 5As shown, a fixed seat 456 is formed on the seat plate 500 near the transmission block 455. A retaining rib 457 is provided on the transmission block 455, and a retaining groove 458 is provided on the fixed seat 456. The transmission block 455 can rotate and drive the retaining rib 457 into or out of the retaining groove 458. When the retaining rib 457 enters the retaining groove 458, the lever 453 approaches the fixed block 451. Naturally, after the retaining rib 457 is connected to the retaining groove 458, the two fit tightly. If it is necessary to remove the retaining rib 457... The slot 458 needs to overcome a certain resistance. In order to ensure that the retaining rib 457 can smoothly enter the slot 458 and can disengage from the slot 458, the retaining rib 457 can be made of an elastic material, such as rubber or plastic. When the transmission block 455 rotates to be close to the slot 458, it will generate elastic compression on the retaining rib 457, so that the retaining rib 457 will elastically deform and enter the slot 458. Similarly, when the transmission block 455 is rotated to disengage from the slot 458, the retaining rib 457 is elastically deformed to disengage from the slot 458. When it is necessary to rotate the lever 453 toward the fixed block 451, the user rotates the transmission block 455. At this time, the pull rope 454 can provide a driving force for the lever 453 to move toward the fixed block 451. When the lever 453 moves to a position close to the end of the stroke of the fixed block 451, the retaining rib 457 on the transmission block 455 enters the retaining groove 458. By utilizing the cooperation between the retaining rib 457 and the retaining groove 458, the position of the transmission block 455 can be maintained, thereby maintaining the relative state of the limiting rib 421 and the clearance groove. When it is necessary to change the function of the backrest 300, the user can apply force to the transmission block 455 to make the transmission block 455 rotate so that the retaining rib 457 disengages from the retaining groove 458. In this way, by restricting the rotation state of the transmission block 455, the function state of the backrest 300 can be easily maintained, improving the user experience.

[0035] To facilitate limiting the travel of the lever 453, in this embodiment, a notch 442 is provided on the first limiting ring 441. The lever 453 extends into the notch 442, and the fixing block 451 is located on one side of the notch 442. The second spring 452 has a tendency to push the lever 453 towards the other side of the notch 442. The notch 442 on the first limiting ring 441 can provide a function of avoiding and limiting the travel of the lever 453. When the lever 453 rotates towards the notch 442, it rotates closer to the fixing block 451. When the lever 453 moves to the other side of the notch 442, the first limiting ring 441 limits the travel of the lever 453, preventing the restoring force of the second spring 452 from pushing the lever 453 away too far, thus ensuring the stability of the connection between the pull rope 454 and the lever 453.

[0036] In the above embodiment, the clearance groove corresponds to the rotation path of the limiting rib 421. For example, the clearance groove can be directly opposite the middle position of the rotation path of the limiting rib 421. In this case, if it is necessary to make the clearance groove and the limiting rib 421 directly opposite each other, it is necessary to control the lever 453 to rotate half of its stroke through the transmission block 455, which is relatively troublesome to operate. Therefore, in order to improve the convenience of control, the clearance groove can be directly opposite the two ends of the rotation path of the limiting rib 421. Specifically, when the lever 453 is away from the fixed block 451, the limiting rib 421 is directly opposite the clearance groove. When the elastic force of the second spring 452 pushes the lever 453 away from the fixed block 451, since the limiting rib 421 is directly opposite the clearance groove, the position of the lever 453 can be maintained without applying external force, so that the telescopic rod 400 can realize the normal telescopic function.

[0037] The telescopic rod 400 has multiple transmission structures. If these structures were directly exposed, they would be easily damaged by impacts from external objects. To better protect them, in this embodiment, an upper protective shell 461 is rotatably connected to the bottom of the backrest 300, and a lower protective shell 462 is rotatably connected to the rear of the connecting seat 110. The top of the lower protective shell 462 is inserted into the bottom of the upper protective shell 461, and the telescopic rod 400 is located within the upper protective shell 461 and the lower protective shell 462. The upper protective shell 461 and the lower protective shell 462 form a telescopic structure that protects the telescopic rod 400. When the backrest 300 is tilted back, the telescopic rod 400 shortens, and the top of the lower protective shell 462 further inserts into the upper protective shell 461. When the backrest 300 returns to its upright position, the telescopic rod 400 extends, and the top of the lower protective shell 462 gradually moves out of the upper protective shell 461. This provides effective protection for the transmission structure and helps extend the overall service life.

[0038] As a specific implementation method for connecting and fixing the base plate 500 to the support frame 200, such as Figure 4As shown, the support frame 200 has upwardly extending support arms 210 on both sides of its front portion. The two support arms 210 are rotatably connected to both sides of the seat plate 500. The rotation axes of the two support arms 210 rotatably connected to both sides of the seat plate 500 extend in the left-right direction. Armrests 600 are rotatably connected to both sides of the seat plate 500 behind the two support arms 210. The rotation axes of the two armrests 600 connected to both sides of the seat plate 500 extend in the left-right direction. Therefore, it is reasonable to provide support for the user's hands at the top of each of the two armrests 600. The structure includes a supporting armrest plate, etc. The bottoms of the two armrests 600 respectively bypass the bottom side of the connecting seat 110 and are connected to each other. A connecting groove 610 is provided at the connection point of the two armrests 600. A protrusion 111 is provided on the bottom side of the connecting seat 110 that can enter the connecting groove 610. The rear part of the protrusion 111 is rotatably connected to the connecting groove 610. In practical applications, a connecting shaft is inserted through the protrusion 111 in the left-right direction, and the two ends of the connecting shaft are rotatably connected to the two sides of the connecting groove 610, thereby realizing the rotatable connection of the rear part of the protrusion 111 to the connecting groove 610. The seat plate 500 provides stable support through its connection with the support plate and armrests 600. When the backrest 300 is fixed relative to the seat plate 500, the protrusion 111 on the bottom side of the connecting seat 110 does not fully rotate into the connecting groove 610 at the connection point of the two armrests 600. When the backrest 300 tilts back relative to the seat plate 500, the seat plate 500 rotates and drives the two armrests 600 to rotate relative to each other. At this time, the protrusion 111 further rotates into the connecting groove 610. When the backrest 300 tilts back relative to the seat plate 500 to the end of its stroke, the protrusion 111 fully enters the connecting groove 610. In this way, the protrusion 111 is engaged in the connecting groove 610 to form a limit, thereby providing a fulcrum for stroke limit and further improving the overall structural stability when using the backrest 300 tilting function.

[0039] In some embodiments, the support frame 200 is provided with a clearance opening 112 corresponding to the position of the connecting seat 110. The connecting seat 110 is located within the clearance opening 112 of the support frame 200. Since the telescopic rod 400 connects the connecting seat 110 and the backrest 300, the telescopic rod 400 can also be placed within the clearance opening 112. In this way, the support frame 200 forms a protective structure on both sides of the connecting seat 110 and the telescopic rod 400. Furthermore, the support frame 200 has rotating connection points at the front positions on both sides of the connecting seat 110, thereby improving the stability of the connection structure between the support frame 200 and the connecting seat 110. The support frame 200 also has rotating connection points at the rear positions on both sides of the telescopic rod 400, further improving the stability of the connection structure between the telescopic rod 400 and the support frame 200. In this case, the backrest 300 forms connection points at the positions of the support frame 200 on both sides of the telescopic rod 400, making the overall structure more stable and compact.

[0040] In some embodiments, the seat frame 100 itself can also drive the lifting and adjustment function. A drive component such as a cylinder, electric screw or hydraulic cylinder can be installed in the seat frame 100 to drive the connecting seat 110 to move up and down, thereby adjusting the height during use. In order to facilitate the control of the drive component, a controller can also be provided on the seat plate 500 to control the overall lifting and lowering.

[0041] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A type of seat, characterized in that: include: The frame (100) has a connecting seat (110) on its top side; A support frame (200) is rotatably connected to the front of a connecting seat (110) at its front, and the rear of the support frame (200) extends to the rear of the connecting seat (110). The backrest (300) is rotatably connected to the rear of the support frame (200); The telescopic rod (400) is rotatably connected at both ends to the bottom of the backrest (300) and the rear of the connecting seat (110). The telescopic rod (400) is provided with a locking structure, which can release or restrict the extension and retraction of the telescopic rod (400). The seat plate (500) is connected to the support frame (200) and is located above the connecting seat (110).

2. The seat according to claim 1, characterized in that: The telescopic rod (400) includes a main sleeve (410), a sub-sleeve (420), a first spring (430), and a rod body (440). The top end of the main sleeve (410) is rotatably connected to the bottom of the backrest (300), and the bottom end of the rod body (440) is rotatably connected to the rear of the connecting seat (110). A first limiting ring (441) is formed on the outer side of the bottom of the rod body (440). The bottom of the sub-sleeve (420) is sleeved on the outer side of the rod body (440) and abuts against the first limiting ring (441). The top of the sub-sleeve (420) is inserted into the main sleeve (410). The outer side of the main sleeve (420) is provided with a limiting rib (421), and the inner side of the main sleeve (410) is provided with a relief groove into which the limiting rib (421) can be inserted. The outer side of the main sleeve (410) forms a second limiting ring (411). The first spring (430) is sleeved on the outer side of the main sleeve (410) and the sub-sleeve (420). The two ends of the first spring (430) abut against the first limiting ring (441) and the second limiting ring (411) respectively. The locking structure can drive the sub-sleeve (420) to rotate so that the limiting rib (421) and the relief groove are directly opposite each other or staggered.

3. A seat according to claim 2, characterized in that: The locking structure includes a driving part, a fixing block (451), a second spring (452), and a lever (453). The fixing block (451) is formed on the outside of the rod body (440), and the lever (453) is formed at the bottom of the sub-sleeve (420). The second spring (452) is disposed between the fixing block (451) and the lever (453). The second spring (452) has a tendency to push the lever (453) away from the fixing block (451). The driving part is disposed on the fixing block (451) and drives the lever (453). The driving part can drive the lever (453) to move closer to the fixing block (451). The clearance groove is directly opposite to the rotation path of the limiting rib (421).

4. A seat according to claim 3, characterized in that: The drive unit includes a pull rope (454), and a transmission block (455) is rotatably connected to the seat plate (500). One end of the pull rope (454) passes through the fixed block (451) and the second spring (452) and is connected to the lever block (453). The other end of the pull rope (454) is connected to the transmission block (455).

5. A seat according to claim 4, characterized in that: A fixed seat (456) is formed on the seat plate (500) near the transmission block (455). A retaining rib (457) is provided on the transmission block (455), and a retaining groove (458) is provided on the fixed seat (456). The transmission block (455) can rotate and drive the retaining rib (457) to enter or leave the retaining groove (458). When the retaining rib (457) enters the retaining groove (458), the pusher block (453) moves close to the fixed block (451).

6. A seat according to claim 3, characterized in that: The first limiting ring (441) is provided with a notch (442), the push block (453) extends into the notch (442), the fixing block (451) is located on one side of the notch (442), and the second spring (452) has a tendency to push the push block (453) towards the other side of the notch (442).

7. A seat according to claim 6, characterized in that: When the push block (453) moves away from the fixed block (451), the limiting rib (421) is directly opposite the clearance groove.

8. A seat according to claim 1, characterized in that: The bottom of the backrest (300) is rotatably connected to an upper protective shell (461), and the rear of the connecting seat (110) is rotatably connected to a lower protective shell (462). The top of the lower protective shell (462) is inserted into the bottom of the upper protective shell (461), and the telescopic rod (400) is located inside the upper protective shell (461) and the lower protective shell (462).

9. A seat according to claim 1, characterized in that: The support frame (200) has upwardly extending support arms (210) on both sides of its front part. The two support arms (210) are rotatably connected to both sides of the seat plate (500). The seat plate (500) is rotatably connected to the two support arms (210) on both sides of its rear part. The bottom of the two handrails (600) passes around the bottom side of the connecting seat (110) and is connected to each other. A connecting groove (610) is provided at the connection point of the two handrails (600). A protrusion (111) is provided on the bottom side of the connecting seat (110) that can enter the connecting groove (610). The rear part of the protrusion (111) is rotatably connected to the connecting groove (610).

10. A seat according to claim 1, characterized in that: The support frame (200) is provided with a clearance opening (112) corresponding to the position of the connecting seat (110).

Images