Seat

Abstract

The invention discloses a seat, comprising: a seat frame, the top side of which is provided with a connecting seat; 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 providing stable support for 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] The present invention relates to a piece of furniture, and more particularly to a seat. Background Art

[0002] There are various types of seats. The backrests of some seats are fixed. To improve the comfort of use, the backrests of some seats are provided with an elastically reclinable structure. When in use, when people lean on the backrest, the backrest can elastically deform backward to improve the comfort of people. And for some seats, in order to increase the reclining angle of the backrest, the backrest is directly hinged to the seat. In this way, the backrest can have a large rotational freedom, but this method reduces the support force for the backrest and easily causes the hinge position of the backrest to become loose or damaged. Therefore, there is an urgent need for a seat that can increase the reclining angle of the backrest and has a stable structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a seat to solve one or more technical problems in the prior art and at least provide a beneficial alternative or create conditions.

[0004] The solution of the present invention to solve its technical problems is as follows:

[0005] A seat, comprising: a seat frame, with a connecting seat arranged on the top side; a support frame, the front part of which is rotatably connected to the front part of the connecting seat, and the rear part of the support frame extends to the rear of the connecting seat; a backrest, rotatably connected to the rear part of the support frame; a telescopic rod, the two ends of which are respectively rotatably connected to the bottom of the backrest and the rear part of the connecting seat, and a locking structure is arranged on the telescopic rod, and the locking structure can release or restrict the telescopic movement of the telescopic rod; a seat board, connected to the support frame and located above the connecting seat.

[0006] The technical solution has at least the following beneficial effects: The backrest is rotatably connected to the rear of the support part and is connected to the bottom of the backrest and the rear of the connecting seat through a telescopic rod to provide support for the backrest. The user can sit on the seat board. When it is necessary to fix the backrest relative to the seat board, the telescopic rod is restricted from telescoping by using the locking structure. At this time, due to the restriction of the telescopic rod, the position state of the backrest can be maintained. When it is necessary to rotate the backrest relative to the seat board, the telescopic rod is released from telescoping by using the locking structure. The user leans back on the backrest. At this time, the support frame can rotate forward around the position where its front part is rotatably connected to the connecting seat as the rotation fulcrum, the telescopic rod contracts, and the backrest reclines backward. The telescopic rod can provide the amount of movement for the backrest to rotate and provide stable support for the backrest. And during this process, since the support frame drives the seat board to rotate, the center of gravity of the human body is kept above the connecting seat, so that the whole seat will not flip backward when the user reclines on the backrest. In this way, not only does the telescopic rod provide stable support for the backrest, enabling the backrest to recline at a certain angle, but also the safety and stability when the backrest reclines are improved, and the overall practicality is stronger.

[0007] As a further improvement of 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, the bottom end of the rod body is rotatably connected to the rear part 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 for inserting the limiting rib is provided on the inner side of the main sleeve, 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 respectively abut against the first limiting ring and the second limiting ring, and the locking structure can drive the sub-sleeve to rotate so that the limiting rib and the avoidance groove are opposite or staggered to each other. When the backrest needs to be fixed relative to the seat plate, the locking structure drives the sub-sleeve to rotate so that the limiting rib and the avoidance groove are staggered with each other. At this time, since the limiting rib cannot enter the avoidance groove, it can only use its top end to abut against the bottom end of the sub-sleeve to limit the sub-sleeve from relatively entering the main sleeve, thereby limiting the contraction activity of the telescopic rod; when the backrest needs to be reclined, the locking structure drives the sub-sleeve to rotate so that the limiting rib and the avoidance groove are opposite to each other. At this time, since the limiting rib can enter the avoidance groove, the sub-sleeve can be relatively inserted into or removed from the main sleeve , so that the front part of the support frame can rotate around the position where it is rotatably connected to the connecting seat, driving the backrest to recline, and when the sub-sleeve is relatively inserted into the main sleeve, the first spring located between the first limiting ring and the second limiting ring is elastically compressed, so that the backrest can provide elastic supporting force to the human body, improving the comfort of use. In this way, the sub-sleeve is driven to rotate through the locking structure, so that the limiting rib and the avoidance groove are opposite to each other to release the restriction on the telescopic rod, or the limiting rib and the avoidance groove are staggered to limit the extension and retraction of the telescopic rod.

[0008] As a further improvement of the above technical solution, the locking structure includes a driving part, a fixed block, a second spring and a shift block, the fixed block is formed on the outside of the rod body, the shift block is formed at the bottom of the sub-sleeve, the second spring is arranged between the fixed block and the shift block, the second spring has a tendency to push the shift block away from the fixed block, the driving part is arranged on the fixed block, the driving part drives the shift block, the driving part can drive the shift block to approach the fixed block, and the avoidance groove is opposite to the rotation path of the limiting rib. When it is necessary to drive the limiting convex rib and the avoidance groove to face each other or staggered, the driving part can be used to drive the shift block to approach the fixed block, thereby driving the sub-sleeve to rotate relative to the main sleeve. At this time, the second spring located between the fixed block and the shift block is in a compressed state; or the driving force of the driving part on the shift block is removed, and the elastic restoring force of the second spring can push the shift block away from the fixed block, thereby driving the sub-sleeve to rotate in the opposite direction relative to the main sleeve. In the process of driving the sub-sleeve to rotate repeatedly relative to the main sleeve, the limiting convex rib and the avoidance groove can be made to face each other or staggered, thereby limiting or releasing the telescopic function of the telescopic rod.

[0009] As a further improvement of the above technical solution, the driving part includes a pull rope, the seat plate is rotatably connected with a transmission block, one end of the pull rope passes through the fixed block and the second spring and is connected to the shift block, and the other end of the pull rope is connected to the transmission block. When it is necessary to drive the shift block to rotate toward the fixed block, the user can exert force on the transmission block on the seat plate and rotate the transmission block. At this time, the transmission block provides the shift block with a driving force to move toward the fixed block through the pull rope, and manual control can be conveniently achieved.

[0010] As a further improvement of the above technical solution, a fixed seat is formed near the position of the seat plate near the transmission block, a clamping rib is provided on the transmission block, and a clamping slot is provided on the fixed seat. The transmission block can rotate and drive the clamping rib to enter or disengage from the clamping slot. When the clamping rib enters the clamping slot, the shift block is close to the fixed block. When it is necessary to drive the shift block to rotate toward the fixed block, the user rotates the transmission block. At this time, the pull rope can be used to provide a driving force for the shift block to move toward the fixed block. When the shift block moves to a position close to the end of the fixed block stroke, the clamping rib on the transmission block enters the clamping slot. By using the mutual cooperation of the clamping rib and the clamping slot, the position state of the transmission block can be maintained, thereby maintaining the relative state of the limiting rib and the avoidance slot. When it is necessary to change the use function of the backrest, the user can apply force to the transmission block so that the transmission block rotates to disengage the clamping rib from the clamping slot. In this way, by limiting the rotation state of the transmission block, the use function state of the backrest can be conveniently maintained, thereby improving the use experience.

[0011] As a further improvement of the above technical solution, a notch is provided on the first limiting ring, the dial block extends into the notch, the fixed block is located on one side of the notch, and the second spring has a tendency to push the dial block towards the other side of the notch. The notch provided on the first limiting ring can provide the functions of avoiding and limiting the stroke for the dial block. When the dial block rotates towards one side of the notch, at this time the dial block rotates towards and approaches the fixed block. When the dial block moves to the other side of the notch, at this time the first limiting ring is used to limit the moving stroke of the dial block, which can prevent the elastic force of the second spring from restoring to push the dial block away too far, and ensure the stability of the connection between the pull rope and the dial block.

[0012] As a further improvement of the above technical solution, when the dial block is away from the fixed block, the limiting rib is aligned with the avoidance groove. When the elastic force of the second spring restores to push the dial block away from the fixed block, since the limiting rib is aligned with the avoidance groove, at this time the position state of the dial block can be maintained without applying external force, so that the telescopic rod can realize the normal telescopic function.

[0013] As a further improvement of the above technical solution, the bottom of the backrest is rotatably connected with an upper protective shell, the rear part of the connecting seat is rotatably connected with a lower protective shell, 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 protective shell and the lower protective shell. The upper protective shell and the lower protective shell form a telescopic structure to protect the telescopic rod inside. When the backrest reclines, the telescopic rod shortens, and at this time the top of the lower protective shell is further inserted into the upper protective shell. When the backrest returns to the upright position, the telescopic rod extends, and at this time the top of the lower protective shell gradually moves out of the upper protective shell. In this way, the transmission structure can be effectively protected, which is beneficial to extending the overall service life.

[0014] As a further improvement of the above technical solution, support arms extending upward are formed on both sides of the front part of the support frame. The two support arms are respectively rotatably connected to both sides of the seat plate. Armrests are respectively rotatably connected to the rear sides of both sides of the seat plate. The bottom parts of the two armrests respectively bypass the bottom side of the connecting seat and are connected to each other. A connecting groove is provided at the connection part of the two armrests. A convex block that can enter the connecting groove is provided on the bottom side of the connecting seat. The rear part of the convex block is rotatably connected in the connecting groove. The seat plate provides stable support through the connection with the support plate and the armrests. When the backrest is fixed relative to the seat plate, the convex block on the bottom side of the connecting seat has not completely rotated into the connecting groove at the connection part of the two armrests. When the backrest reclines relative to the seat plate, the seat plate rotates and drives the two armrests to rotate relative to each other. At this time, the convex block further rotates into the connecting groove. When the backrest reclines relative to the seat plate to the end of the stroke, the convex block completely enters the connecting groove. In this way, the convex block is used to cooperate with the connecting groove to form a limit, so as to provide a fulcrum for stroke limit, and further improve the stability of the overall structure when using the backrest reclining function.

[0015] As a further improvement of the above technical solution, an avoidance opening is provided at the position of the support frame corresponding to the connection seat. The connection seat is located within the avoidance opening of the support frame, making the overall structure more stable and compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, rather than all embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0017] Figure 1 is the overall three-dimensional view of the present invention.

[0018] Figure 2 is the three-dimensional view of the present invention excluding the upper protective shell and the lower protective shell.

[0019] Figure 3 is Figure 2 the partial enlarged schematic view of A of

[0020] Figure 4 is the three-dimensional view of the present invention after the armrest is separated from the seat plate and the connection seat.

[0021] Figure 5 is the three-dimensional view of the present invention after the transmission block is separated from the seat plate.

[0022] In the drawings: 100 - seat frame, 110 - connection seat, 111 - convex block, 112 - avoidance opening, 200 - support frame, 210 - support arm, 300 - backrest, 400 - telescopic rod, 410 - main sleeve, 411 - second limit ring, 420 - sub-sleeve, 421 - limit rib, 430 - first spring, 440 - rod body, 441 - first limit ring, 442 - notch, 451 - fixed block, 452 - second spring, 453 - dial block, 454 - pull rope, 455 - transmission block, 456 - fixed seat, 457 - clamping rib, 458 - clamping groove, 461 - upper protective shell, 462 - lower protective shell, 500 - seat plate, 600 - armrest, 610 - connection groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0024] In the description of the present invention, it should be understood that with respect to the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention.

[0025] In the description of the present invention, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0027] Referring to Figure 1 and Figure 2 , a seat, comprising a seat frame 100, a support frame 200, a backrest 300, a telescopic rod 400 and a seat board 500. Among them, 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 rotation axis of the front part of the support frame 200 rotatably connected to the connecting seat 110 extends in the left-right direction, and 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, and the rotation axis of the backrest 300 rotatably connected to the rear part of the support frame 200 extends in the left-right direction; both ends of the telescopic rod 400 are respectively rotatably connected to the bottom of the backrest 300 and the rear part of the connecting seat 110, and the rotation axes at both ends of the telescopic rod 400 respectively extend in the left-right direction. A locking structure is provided on the telescopic rod 400, and the locking structure can release or limit the telescopic movement of the telescopic rod 400; the seat board 500 is connected to the support frame 200. Naturally, the support frame 200 has a structure extending upward above the seat board 500, so that the seat board 500 is located above the connecting seat 110.

[0028] As can be seen from the above, the backrest 300 is rotatably connected to the rear of the support portion and is connected between the bottom of the backrest 300 and the rear of the connection seat 110 through the telescopic rod 400 to provide support for the backrest 300. The user can sit on the seat plate 500. When the backrest 300 needs to be fixed relative to the seat plate 500, the telescopic rod 400 is restricted from telescoping by using the locking structure. At this time, due to the restriction of the telescopic rod 400, the position state of the backrest 300 can be maintained. When the backrest 300 needs to rotate relative to the seat plate 500, the telescopic rod 400 is released from the telescopic restriction by using the locking structure. The user leans back on the backrest 300. At this time, the support frame 200 can rotate forward around the position where its front part is rotatably connected to the connection seat 110 as the rotation fulcrum. The telescopic rod 400 contracts, and the backrest 300 reclines backward. The telescopic movement of the telescopic rod 400 can provide an amount of movement for the rotation of the backrest 300 and provide stable support for the backrest 300. And during this process, since the support frame 200 drives the seat plate 500 to rotate, the center of gravity of the human body is kept above the connection seat 110, so that the whole seat will not flip backward when the user reclines on the backrest 300. In this way, not only the telescopic rod 400 provides stable support for the backrest 300, enabling the backrest 300 to recline at a certain angle, but also the safety and stability during the reclining use of the backrest 300 are improved, and the overall practicality is stronger.

[0029] The telescopic rod 400 can be telescopically adjusted. There are various structural forms for locking and restricting or releasing the restriction of its telescopic movement. For example, a positioning member can be directly inserted into the telescopic rod 400 to restrict the telescopic movement of the telescopic rod 400. In this embodiment, as 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 portion 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 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. The limiting rib 421 extends along the axial direction of the sub-sleeve 420. The main sleeve 410 is extended, and an avoidance groove for the limiting rib 421 to be inserted is provided on the inner side of the main sleeve 410, 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 sides of the main sleeve 410 and the sub-sleeve 420, and the two ends of the first spring 430 are respectively against the first limiting ring 441 and the second limiting ring 411. The locking structure can drive the sub-sleeve 420 to rotate so that the limiting rib 421 and the avoidance groove are opposite to or staggered with each other. In practical applications, the number of limiting ribs 421 can be multiple, for example, the number of limiting ribs 421 is two, and correspondingly, the number of avoidance grooves on the inner side of the main sleeve 410 is two, and the two limiting ribs 421 can be opposite to or staggered with the two avoidance grooves respectively.

[0030] When using the above telescopic structure to support the backrest 300, when it is necessary to fix the backrest 300 relative to the seat plate 500, the locking structure drives the sub-sleeve 420 to rotate so that the limiting rib 421 is staggered from the avoidance groove. At this time, since the limiting rib 421 cannot enter the avoidance groove, only the top of it can be abutted against the bottom end of the sub-sleeve 420 to limit the relative entry of the sub-sleeve 420 into the main sleeve 410. In this way, the contraction movement of the telescopic rod 400 can be restricted; when it is necessary to realize the reclining function of the backrest 300, the locking structure drives the sub-sleeve 420 to rotate so that the limiting rib 421 is aligned with the avoidance groove. At this time, since the limiting rib 421 can enter the avoidance groove, the sub-sleeve 420 can be relatively inserted into or removed from the main sleeve 410, so that the front part of the support frame 200 can rotate around its position rotatably connected to the connection seat 110, driving the backrest 300 to recline. And when the sub-sleeve 420 is relatively inserted into the main sleeve 410, the first spring 430 located between the first limiting ring 441 and the second limiting ring 411 is elastically compressed, so that the backrest 300 can provide an elastic supporting force for the human body, improving the comfort of use. In this way, by driving the sub-sleeve 420 to rotate through the locking structure, the limiting rib 421 is aligned with the avoidance groove to release the restriction on the telescopic rod 400, or the limiting rib 421 is staggered from the avoidance groove to limit the telescopic movement 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. There are many structural forms. For example, the locking structure can be a driving source such as a rotary cylinder or a motor. By directly driving the sub-sleeve 420 to rotate, the limiting rib 421 on the outside of the sub-sleeve 420 and the avoidance groove on the inside of the main sleeve 410 are aligned with or staggered with each other. In this embodiment, the locking structure includes a driving part, a fixing block 451, a second spring 452 and a shifting block 453. The fixing block 451 is formed on the rod body 44 0 outer side, the shift block 453 is formed at the bottom of the sub-sleeve 420, the second spring 452 is arranged between the fixed block 451 and the shift block 453, the second spring 452 has a tendency to push the shift block 453 away from the fixed block 451, the driving part is arranged on the fixed block 451, the driving part drives the shift block 453, the driving part can drive the shift block 453 to approach the fixed block 451, and the avoidance groove is opposite to the rotation path of the limiting rib 421. When it is necessary to drive the limiting convex rib 421 and the avoidance groove to face each other or staggered, the driving part can be used to drive the shift block 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 shift block 453 is in a compressed state; or the driving force of the driving part on the shift block 453 is removed, and the elastic restoring force of the second spring 452 can push the shift block 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 driving the sub-sleeve 420 to rotate repeatedly relative to the main sleeve 410, the limiting convex rib 421 and the avoidance groove can be made to face each other or staggered, thereby limiting or releasing the telescopic function of the telescopic rod 400.

[0032] The driving unit mainly provides pulling force to the shift block 453 so that the shift block 453 is close to the fixed block 451. There are various structural forms. For example, the driving unit can adopt a linear driving source such as a cylinder, an electric screw, or a structure that applies force manually such as a pull rod. In order to reduce the setting of the driving source and facilitate the layout, in this embodiment, the driving unit includes a pull rope 454, and 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 the transmission block 455 is connected to the bottom side of the seat plate 500, so as to improve 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 shift block 453, and the other end of the pull rope 454 is connected to the transmission block 455. When it is necessary to drive the shift block 453 to rotate toward the fixed block 451, the user can exert force on the transmission block 455 on the seat plate 500 and rotate the transmission block 455. At this time, the transmission block 455 provides the driving force for the shift block 453 to move toward the fixed block 451 through the pull rope 454, which can conveniently realize manual control.

[0033] In actual application, an opening is provided at the rear side of the connection seat 110 facing the telescopic rod 400, and the pull rope 454 can enter the connection seat 110 from the opening, pass through the top side of the connection seat 110, and be connected to the transmission block 455. In order to ensure that the pull rope 454 can be effectively pulled when the transmission block 455 rotates, the position where the pull rope 454 is connected to the transmission block 455 deviates from the rotation axis of the transmission block 455 connected to the seat plate 500, so that when the transmission block 455 is rotated, the pull rope 454 can effectively pull the shift block 453. In order to better protect the pull rope 454, a wire protection cover can be set on the outside of the pull rope 454. In addition, in order to facilitate fixing the two ends of the pull rope 454 to the fixed block 451 and the transmission block 455 respectively, connecting balls can be connected to the two ends of the pull rope 454 respectively, and anti-slip grooves are respectively provided on the side of the fixed block 451 and the transmission block 455 away from the pull rope 454, and transition grooves connected to the anti-slip grooves are respectively provided on the outer sides of the fixed block 451 and the transmission block 455. The pull rope 454 enters the anti-slip groove from the transition groove, driving the connecting ball to be embedded in the anti-slip groove. When in use, since the pull rope 454 is in a tensioned state, it is difficult to move the connecting ball out of the anti-slip groove.

[0034] Since the first spring 430 has a tendency to push the shift block 453 away from the fixed block 451, in order to ensure that the shift block 453 is close to the fixed block 451, in this embodiment, Figure 5As shown, a fixed seat 456 is formed at a position of the seat board 500 close to the transmission block 455. A clamping rib 457 is provided on the transmission block 455, and a clamping groove 458 is provided on the fixed seat 456. The transmission block 455 can rotate to drive the clamping rib 457 to enter or disengage from the clamping groove 458. When the clamping rib 457 enters the clamping groove 458, the dial block 453 is close to the fixed block 451. Naturally, after the clamping rib 457 is fitted and connected to the clamping groove 458, the two are closely fitted. If it is necessary to disengage the clamping rib 457 from the clamping groove 458, a certain resistance needs to be overcome. In order to ensure that the clamping rib 457 can smoothly enter the clamping groove 458 and can be disengaged from the clamping groove 458, the clamping rib 457 can be made of an elastic material, such as rubber, plastic, etc. When the transmission block 455 rotates close to the clamping groove 458, it will elastically squeeze the clamping rib 457, so that the clamping rib 457 elastically deforms and enters the clamping groove 458. Similarly, when the transmission block 455 is rotated to disengage from the clamping groove 458, the clamping rib 457 is elastically deformed to disengage it from the clamping groove 458. When it is necessary to drive the dial block 453 to rotate towards the fixed block 451, the user rotates the transmission block 455. At this time, a driving force for the dial block 453 to move towards the fixed block 451 can be provided through the pull rope 454. When the dial block 453 moves to a position near the end of the stroke close to the fixed block 451, the clamping rib 457 on the transmission block 455 enters the clamping groove 458. By using the mutual cooperation between the clamping rib 457 and the clamping groove 458, the position state of the transmission block 455 can be maintained, so as to maintain the relative state between the limiting rib 421 and the avoidance groove. When it is necessary to change the use function of the backrest 300, the user can apply force to the transmission block 455 to rotate the transmission block 455 to disengage the clamping rib 457 from the clamping groove 458. In this way, by restricting the rotation state of the transmission block 455, the use function state of the backrest 300 can be conveniently maintained, improving the use experience.

[0035] In order to conveniently limit the movement stroke of the dial block 453, in this embodiment, a notch 442 is provided on the first limiting ring 441. The dial block 453 extends into the notch 442. The fixed block 451 is located on one side of the notch 442. The second spring 452 has a tendency to push the dial block 453 towards the other side of the notch 442. The notch 442 provided on the first limiting ring 441 can provide the functions of avoiding and limiting the stroke for the dial block 453. When the dial block 453 rotates towards one side of the notch 442, at this time the dial block 453 rotates and approaches the fixed block 451. When the dial block 453 moves to the other side of the notch 442, at this time the movement stroke of the dial block 453 is limited by the first limiting ring 441, which can prevent the elastic force of the second spring 452 from restoring and pushing the dial block 453 away too far, ensuring the stability of the connection between the pull rope 454 and the dial block 453.

[0036] In the above embodiments, the avoidance groove corresponds to the rotation path of the limit rib 421. For example, the avoidance groove can be directly opposite to the middle position of the rotation path of the limit rib 421. At this time, if it is necessary to align the avoidance groove with the limit rib 421, it is necessary to control the rotation of the dial block 453 by half of the stroke through the transmission block 455, which is rather troublesome in operation. Therefore, in order to improve the convenience of control, the avoidance groove can be directly opposite to the two ends of the rotation path of the limit rib 421. Specifically, when the dial block 453 is away from the fixed block 451, the limit rib 421 is directly opposite to the avoidance groove. When the elastic force of the second spring 452 during restoration pushes the dial block 453 away from the fixed block 451, since the limit rib 421 is directly opposite to the avoidance groove, the position state of the dial block 453 can be maintained without applying external force at this time, so that the telescopic rod 400 can realize the normal telescopic function.

[0037] There are multiple transmission structures on the telescopic rod 400. If directly exposed, they are easily damaged by external objects. In order to better protect them, in this embodiment, the upper protective shell 461 is rotatably connected to the bottom of the backrest 300, and the 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 inside 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 to protect the telescopic rod 400 inside. When the backrest 300 reclines, the telescopic rod 400 shortens, and at this time, the top of the lower protective shell 462 is further inserted into the upper protective shell 461. When the backrest 300 returns to the upright position, the telescopic rod 400 elongates, and at this time, the top of the lower protective shell 462 gradually moves out of the upper protective shell 461. In this way, the transmission structure can be effectively protected, which is beneficial to extending the overall service life.

[0038] As a specific implementation manner for the support frame 200 to connect and fix the seat plate 500, such as Figure 4As shown, on both sides of the front part of the support frame 200, there are support arms 210 extending upward. The two support arms 210 are respectively 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. On both sides of the rear of the two support arms 210, there are respectively rotatably connected armrests 600. The rotation axes of the two armrests 600 connected to both sides of the seat plate 500 both extend in the left-right direction. Naturally, structures such as handrest plates that can be used to support the user's hands can be respectively arranged at the top side positions of the two armrests 600. The bottom parts of the two armrests 600 respectively bypass the bottom side of the connection seat 110 and are connected to each other. A connection groove 610 is arranged at the connection part of the two armrests 600. A convex block 111 that can enter the connection groove 610 is arranged at the bottom side of the connection seat 110. The rear part of the convex block 111 is rotatably connected in the connection groove 610. In practical applications, a connection shaft is inserted through the convex block 111 in the left-right direction, and both ends of the connection shaft are respectively rotatably connected to both sides of the connection groove 610, so as to realize the rotational connection of the rear part of the convex block 111 in the connection groove 610. The seat plate 500 provides stable support through its connection with the support plate and the armrests 600. When the backrest 300 is fixed relative to the seat plate 500, the convex block 111 at the bottom side of the connection seat 110 does not completely rotate into the connection groove 610 at the connection part of the two armrests 600. When the backrest 300 reclines relative to the seat plate 500, the seat plate 500 rotates and drives the two armrests 600 to rotate relatively. At this time, the convex block 111 further rotates into the connection groove 610. When the backrest 300 reclines relative to the seat plate 500 to the end of the stroke, the convex block 111 completely enters the connection groove 610. In this way, the convex block 111 is used to cooperate with the connection groove 610 to form a limit, so as to provide a fulcrum for stroke limit and further improve the stability of the overall structure when using the reclining function of the backrest 300.

[0039] In some embodiments, an avoidance opening 112 is arranged at the position of the support frame 200 corresponding to the connection seat 110. The connection seat 110 is located in the avoidance opening 112 of the support frame 200. Since the telescopic rod 400 is connected between the connection seat 110 and the backrest 300, the telescopic rod 400 can also be arranged in the avoidance opening 112 at this time. In this way, the support frame 200 forms a surrounding and protecting structure on both sides of the connection seat 110 and both sides of the telescopic rod 400. And the support frame 200 respectively forms rotation connection points at the positions on both sides of the connection seat 110 in the front part, so as to improve the connection structure stability between the support frame 200 and the connection seat 110. And the support frame 200 also respectively forms rotation connection points at the positions on both sides of the telescopic rod 400 in the rear part, improving the connection structure stability between the telescopic rod 400 and the support frame 200. At this time, 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 function of lifting and adjusting. Driving components such as cylinders, electric lead screws or hydraulic cylinders can be installed in the seat frame 100. By driving the connecting seat 110 to move up and down, the height during use can be adjusted. In order to facilitate the control of the driving component, a controller can also be provided on the seat board 500 for controlling the overall lifting.

[0041] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A seat, characterized in that: include: A seat frame (100) having a connecting seat (110) disposed on the top side; A support frame (200), the front portion of which is rotatably connected to the front portion of the connecting seat (110), and the rear portion of the support frame (200) extends to the rear of the connecting seat (110); A backrest (300) rotatably connected to the rear portion of the support frame (200); A telescopic rod (400), both ends of which are rotatably connected to the bottom of the backrest (300) and the rear of the connecting seat (110), and a locking structure is provided on the telescopic rod (400), and the locking structure can release or limit the telescopic movement 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. A seat according to claim 1, characterized in that: The telescopic rod (400) comprises 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); 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); and the sub-sleeve (420) is inserted into the main sleeve (410). A limiting rib (421) is arranged on the outer side of the main sleeve (420), an avoidance groove for inserting the limiting rib (421) is arranged on the inner side of the main sleeve (410), 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 sides of the main sleeve (410) and the sub-sleeve (420), the two ends of the first spring (430) are respectively against the first limiting ring (441) and the second limiting ring (411), and the locking structure can drive the sub-sleeve (420) to rotate so that the limiting rib (421) and the avoidance groove are opposite to or staggered with each other.

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

4. A seat according to claim 3, characterized in that: The driving part 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 shifting block (453), and 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) at a position close to the transmission block (455); a clamping rib (457) is provided on the transmission block (455); a clamping groove (458) is provided on the fixed seat (456); the transmission block (455) can rotate and drive the clamping rib (457) to enter or leave the clamping groove (458); when the clamping rib (457) enters the clamping groove (458), the shifting block (453) approaches 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 shifting 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 shifting block (453) toward the other side of the notch (442).

7. A seat according to claim 6, characterized in that: When the shifting block (453) is away from the fixing block (451), the limiting convex rib (421) is directly opposite to the avoidance 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), 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 in the upper protective shell (461) and the lower protective shell (462).

9. A seat according to claim 1, characterized in that: Support arms (210) extending upward are formed on both sides of the front of the support frame (200), and the two support arms (210) are rotatably connected to the two sides of the seat plate (500) respectively. The seat plate (500) is located behind the two support arms (210) and is rotatably connected to the two sides thereof. 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 of the two armrests (600), and a protrusion (111) that can enter the connecting groove (610) is provided on the bottom side of the connecting seat (110), and 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 an escape opening (112) at a position corresponding to the connection seat (110).

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