Attractive backrest stepless adjustment seat

Abstract

The utility model discloses an attractive backrest stepless adjusting seat which comprises a backrest, a supporting frame and a seat body, the rear side of the backrest is connected with a front sleeve, the lower end of the supporting frame is connected to the seat body, the upper end of the supporting frame is connected with a rear sleeve, and the front sleeve is connected to the rear sleeve in a sleeving mode and can slide front and back relative to the rear sleeve; the hollow part of the front sleeve is a first accommodating area, the hollow part of the rear sleeve is a second accommodating area, and the first accommodating area and the second accommodating area are communicated with each other and combined to form an adjusting area; a stepless adjusting mechanism is arranged in the adjusting area, the stepless adjusting mechanism comprises a screw rod, a transmission part and an elastic part, and the screw rod is in spiral fit with the transmission part, so that the screw rod can move back and forth relative to the transmission part; the two ends of the elastic piece act on the front sleeve and the rear sleeve respectively. According to the beautiful backrest stepless adjustment seat provided by the invention, the stepless adjustment mechanism is hidden in the adjustment area formed by combining the front sleeve and the rear sleeve, so that the appearance of the seat is relatively simple, and the aesthetic property is relatively good.

Description

Technical Field

[0001] The utility model generally relates to the technical field of seats, and in particular to an aesthetically pleasing seat with a stepless backrest adjustment. Background Art

[0002] Chairs are essential furniture in life and are widely used in various occasions. At present, people not only pursue the comfort of seats, but also pay more attention to the impact of seats on human health. A backrest chair is a chair that can be used by different groups of people. Its backrest is adjustable, so that it can adjust its position according to the user's sitting position or fat or thin status to support the user's back.

[0003] For example, a child seat provided by an existing patent (application number: 202020779106.7) has slide grooves on both sides of the seat, and the sliders on both sides of the backrest extend into the slide grooves, so that the backrest can slide forward and backward relative to the seat. However, when adjusting the front and rear position of the backrest of this type of seat, it is necessary to manually turn on the knob switch on the slider, which is complicated to unlock. After unlocking, the distance of the backrest needs to be manually adjusted, and the backrest cannot perfectly fit the user's back.

[0004] In order to solve the above problems, the existing patent provides a child seat with a retractable backrest (application number: 202220310129.2), in which the backrest support plate is connected to the bracket through a fixed sleeve, and the backrest support plate and the fixed sleeve are adjusted to the front and rear positions through a supporting connecting rod structure, and a linear power component is provided between the backrest support plate and the bracket, and the linear power component pushes the backrest support plate to adjust the position. When the user sits on the seat, the linear power component pushes the backrest support plate so that the backrest can automatically follow the back to fit the user's back. When it reaches a comfortable position, you only need to flip the button switch on the linear power component to quickly lock and fix the position of the backrest, making the adjustment operation of the backrest more convenient and quick.

[0005] However, the above scheme has the following defects: since the supporting link mechanism and the linear power member are separately arranged and exposed on the backrest support plate, it has a greater abruptness compared to the backrest, making the overall appearance of the seat appear bloated and lacking in aesthetics. Summary of the invention

[0006] In view of the above-mentioned defects or shortcomings in the prior art, it is desired to provide an aesthetically pleasing seat with a stepless adjustment backrest. By hiding the stepless adjustment mechanism in the adjustment area formed by the combination of the front sleeve and the rear sleeve, when the seat is in use, only the front sleeve and the rear sleeve are visible parts between the backrest and the support frame, thereby making the seat look simpler and more aesthetically pleasing.

[0007] The effect of the utility model is achieved in this way:

[0008] The present application provides an aesthetically pleasing chair with a stepless backrest adjustment, comprising a backrest, a support frame and a seat, wherein a front sleeve is connected to the rear side of the backrest, the lower end of the support frame is connected to the seat, and the upper end of the support frame is connected to a rear sleeve, the front sleeve is sleeved on the rear sleeve and the front sleeve can slide forward and backward relative to the rear sleeve, thereby driving the backrest to move forward and backward relative to the seat; the hollow portion of the front sleeve is a first accommodating area, and the hollow portion of the rear sleeve is a second accommodating area, and when the front sleeve is sleeved on the rear sleeve, the first accommodating area and the second accommodating area are interconnected and combined to form an adjustment area; the adjustment area A stepless adjustment mechanism is arranged in the area, and the stepless adjustment mechanism includes a screw rod, a transmission member and an elastic member. The screw rod is axially arranged in the first accommodating area, and the transmission member is an annular structure with an inner spiral. The transmission member is connected to the second accommodating area. The screw rod and the transmission member are spirally matched. The screw rod or the transmission member can rotate in the circumferential direction, so that the screw rod can move forward and backward relative to the transmission member, thereby realizing stepless adjustment between the front sleeve and the rear sleeve; the two ends of the elastic member act on the front sleeve and the rear sleeve respectively, so that the front sleeve can be reset with the help of the elastic force of the elastic member.

[0009] Furthermore, the spiral rod is fixedly connected to the front sleeve, the transmission member is rotatably arranged on the rear sleeve, and the stepless adjustment mechanism also includes a locking member; the stepless adjustment mechanism includes a switchable active state and a locked state, in which the locking member avoids the transmission member, and the transmission member can rotate freely, so that the spiral rod can move forward and backward relative to the transmission member; in the locked state, the locking member locks the transmission member, and the transmission member is relatively fixed, so that the spiral rod screwed to the transmission member cannot slide forward and backward, thereby making the position of the backrest relatively fixed. When the user adjusts the backrest to a comfortable position, the position of the backrest can be fixed by adjusting the locking member, and there is no need to repeatedly adjust the backrest during multiple uses, thereby making the adjustment operation of the backrest easier.

[0010] Furthermore, a plurality of stoppers are arranged on the outer wall of the transmission member, and a stopper groove is formed at the interval between any two stoppers connected along the circumference of the transmission member. The locking member is a tubular structure, and the locking member is sleeved on the rear end of the rear sleeve and can slide forward and backward relative to the rear sleeve. The tube wall of the locking member extends axially toward the front end to form a clamping head; in the locked state, the locking member slides forward relative to the rear sleeve until the clamping head is clamped into the stopper groove, and the transmission member and the locking member are relatively fixed; in the active state, the locking member slides backward relative to the rear sleeve until the clamping head avoids the stopper groove, and the transmission member can rotate freely. By setting the locking member as a tubular structure and sleeved on the rear end of the rear sleeve, the switching between the locked state and the active state can be achieved by sliding the locking member forward and backward, and the operation is simple and convenient.

[0011] Furthermore, a partition is vertically arranged in the middle of the second accommodating area, a first avoidance opening is provided in the center of the partition, the first avoidance opening is configured to avoid the spiral rod, the partition is used as a dividing surface, the second accommodating area includes an adjusting part on the front side and a locking part on the rear side, the adjusting part is also sleeved with a positioning sleeve, the interval between the positioning sleeve and the partition forms a positioning area, the transmission member is arranged in the positioning area, the positioning area is configured to position the transmission member in the horizontal direction; the locking member is connected to the locking part, and a second avoidance opening for avoiding the clamping head is provided on the outer side of the partition. The transmission member is fixed in the horizontal direction during the rotation or locking process, thereby preventing the transmission member from being driven out of the rear sleeve when the spiral rod slides back and forth.

[0012] Furthermore, a positioning assembly is provided between the positioning sleeve and the rear sleeve, and the positioning assembly includes a positioning protrusion and a positioning groove that are mutually engaged, the positioning protrusion protrudes from one of the positioning sleeve and the rear sleeve, and the positioning groove is provided in the other of the positioning sleeve and the rear sleeve. This makes the installation and removal of the positioning sleeve easier, and can prevent the positioning sleeve from sliding too deep during installation, resulting in a narrow positioning area, and the transmission member being squeezed by the positioning sleeve and unable to rotate.

[0013] Furthermore, at least two clamps extend from the tube wall of the locking member, so that in the locked state, the connection strength between the locking member and the transmission member is higher, thereby improving the stability of the stepless adjustment mechanism.

[0014] Furthermore, a stop plate is connected to the rear end of the spiral rod, the shaft diameter of the stop plate is larger than the first avoidance opening, and the stop plate is configured to prevent the spiral rod from escaping from the first avoidance opening, so that when the front sleeve moves forward to the maximum distance, the stop plate on the rear side of the spiral rod abuts against the partition plate, thereby preventing the spiral rod from sliding forward out of the first avoidance opening, causing the front sleeve and the rear sleeve to separate, thereby improving the stability of the stepless adjustment mechanism.

[0015] Furthermore, a tubular outer portion is provided at the front end of the rear sleeve, and the diameter of the outer portion is larger than that of the front sleeve, and when the front sleeve is sleeved on the rear sleeve, the rear end of the front sleeve is clamped between the outer portion and the rear sleeve, so that the front sleeve is not easily shaken left and right relative to the rear sleeve due to the limitation of the outer portion, and the connection strength between the front sleeve and the rear sleeve is further improved.

[0016] Furthermore, a mounting groove inclined toward the upper rear is provided at the rear end of the seat, and the lower end of the support frame is bent toward the lower front to form a bent portion, which is slidably matched with the seat through the mounting groove, so that the support frame can slide relative to the seat. When the support frame slides, the backrest slides along the inclined direction of the bent portion, which can not only further adjust the horizontal position of the backrest, but also adjust the vertical height of the backrest, thereby improving the degree of freedom of backrest adjustment.

[0017] Furthermore, a guide groove is provided on the bending part along the length direction, and a knob screw is provided on the seat, the knob screw passes through and is screwed to the seat and the guide groove, and the knob screw is configured to lock or loosen the bending part. By turning the knob screw, the locking or movement between the bending part and the seat can be adjusted, so that the adjustment operation of the support frame is relatively simple.

[0018] The aesthetically pleasing seat with a stepless adjustment backrest provided in the present application allows stepless adjustment between the front sleeve and the rear sleeve through the spiral cooperation of the spiral rod and the transmission part; and the stepless adjustment mechanism is hidden in the adjustment area formed by the combination of the front sleeve and the rear sleeve. When the seat is in use, only the front sleeve and the rear sleeve are visible parts between the backrest and the support frame, thereby making the seat look simpler and more aesthetically pleasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a beautiful seat with a stepless backrest adjustment provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the three-dimensional structure of the aesthetically pleasing seat with a stepless backrest adjustment when adjusted to the front end provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the three-dimensional structure of the aesthetically pleasing seat with a stepless backrest adjustment provided in an embodiment of the present application when adjusted to the extreme end;

[0023] Figure 4 A schematic diagram of the connection structure of the front sleeve and the rear sleeve provided in an embodiment of the present application;

[0024] Figure 5 An internal schematic diagram of the stepless adjustment mechanism provided in the embodiment of the present application when adjusted to the front end;

[0025] Figure 6 An internal schematic diagram of the stepless adjustment mechanism provided in the embodiment of the present application when the adjustment reaches the end;

[0026] Figure 7 A schematic diagram of the three-dimensional structure of a spiral rod provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the internal structure of the front sleeve provided in an embodiment of the present application;

[0028] Fig. 9 A front view of a rear sleeve provided in an embodiment of the present application;

[0029] Fig.10A schematic diagram of the connection structure between the rear sleeve and the positioning sleeve provided in an embodiment of the present application;

[0030] Fig.11 A schematic diagram of the internal structure of the rear sleeve provided in an embodiment of the present application;

[0031] Fig.12 A schematic diagram of the connection structure between the rear sleeve and the support frame provided in an embodiment of the present application;

[0032] Fig.13 A schematic diagram of the connection structure between the locking member and the transmission member provided in an embodiment of the present application;

[0033] Fig.14 A schematic diagram of the connection structure between the seat and the support frame provided in an embodiment of the present application.

[0034] The reference numerals of the drawings are: 1-backrest, 2-support frame, 201-mounting hole, 202-bayonet, 210-bending portion, 211-guide groove, 3-seat, 310-mounting groove, 320-knob screw, 4-front sleeve, 401-recessed portion, 402-screw hole, 410-first accommodating area, 420-screw rod, 421-stop plate, 422-clamping portion, 5-rear sleeve, 501-positioning groove, 502-peripheral portion, 503-rear sleeve, 504-positioning groove, 505-peripheral portion, 506-rear sleeve, 507-positioning groove, 508-peripheral portion, 509-rear sleeve, 510-positioning groove, 511-recessed portion, 512-screw hole, 513-rear sleeve, 514-rear sleeve, 515-rear sleeve, 516-rear sleeve, 517-rear sleeve, 518-rear sleeve, 519-rear sleeve, 520-rear sleeve, 521-rear sleeve, 522-rear sleeve, 523-rear sleeve, 524-rear sleeve, 525-rear sleeve, 526-rear sleeve, 527-rear sleeve, 528-rear sleeve, 529-rear sleeve, 530-rear sleeve, 531-rear sleeve, 532-rear sleeve, 533-rear sleeve, 534-rear sleeve, 535-rear sleeve, 536-rear sleeve, 537-rear sleeve, 538-rear sleeve, 539 -connecting part, 504-hook, 505-connecting hole, 506-stop screw, 510-second accommodating area, 511-adjusting part, 512-locking part, 520-transmission part, 521-stop part, 522-stop groove, 530-locking part, 531-clamp, 532-sliding groove, 540-partition, 541-first avoidance opening, 542-second avoidance opening, 550-positioning sleeve, 551-positioning protrusion, 6-elastic part. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0036] Please refer to the attached Figure 1-14The embodiment of the present application provides an aesthetically pleasing chair with a stepless backrest adjustment, comprising a backrest 1, a support frame 2 and a seat 3. A front sleeve 4 is connected to the rear side of the backrest 1, the lower end of the support frame 2 is connected to the seat 3, and a rear sleeve 5 is connected to the upper end of the support frame 2. The front sleeve 4 is sleeved on the rear sleeve 5 and the front sleeve 4 can slide forward and backward relative to the rear sleeve 5, thereby driving the backrest 1 to move forward and backward relative to the seat 3; the hollow part of the front sleeve 4 is a first accommodating area 410, and the hollow part of the rear sleeve 5 is a second accommodating area 510. When the front sleeve 4 is sleeved on the rear sleeve 5, the first accommodating area 410 and the second accommodating area 510 are interconnected and combined to form an adjustment area; a stepless adjustment mechanism is arranged in the adjustment area. The stepless adjustment mechanism includes a screw rod 420 with an external spiral pattern on the rod body, a transmission member 520 and an elastic member 6. The screw rod 420 is axially arranged in the first accommodating area 410. The transmission member 520 is an annular structure with an inner spiral. The transmission member 520 is connected to the second accommodating area 510. The screw rod 420 and the transmission member 520 are spirally matched. The screw rod 420 or the transmission member 520 can rotate in the circumferential direction, so that the screw rod 420 can move forward and backward relative to the transmission member 520, thereby realizing stepless adjustment between the front sleeve 4 and the rear sleeve 5; the two ends of the elastic member 6 act on the front sleeve 4 and the rear sleeve 5 respectively, so that the front sleeve 4 can be reset with the help of the elastic force of the elastic member 6.

[0037] In this embodiment, the front sleeve 4 and the rear sleeve 5 can be adjusted steplessly through the spiral cooperation of the spiral rod 420 and the transmission member 520; and the stepless adjustment mechanism is hidden in the adjustment area formed by the combination of the front sleeve 4 and the rear sleeve 5. When the seat is in use, only the front sleeve 4 and the rear sleeve 5 are visible parts between the backrest 1 and the support frame 2, so that the seat has a simpler appearance and better aesthetics.

[0038] The rear sleeve 5 is detachably arranged on the support frame 2, a mounting hole 201 is provided at the top of the support frame 2, three bayonet holes 202 are recessed at the top of the support frame 2 near the mounting hole 201, a ring-shaped connecting portion 503 protrudes from the middle of the rear sleeve 5, and three hooks 504 and a connecting hole 505 are provided on the connecting portion 503; when the rear sleeve 5 is installed on the support frame 2, the rear side of the rear sleeve 5 is inserted into the mounting hole 201, the connecting portion 503 abuts against the support frame 2, and the hook 504 on the connecting portion 503 is inserted into the bayonet hole 202, and a screw is screwed into the connecting hole 505 on the connecting portion 503 to fix the rear sleeve 5 and the support frame 2. The installation and disassembly operations between the rear sleeve 5 and the support frame 2 are facilitated, saving space and cost for packaging and transportation.

[0039] Preferably, the elastic member 6 is a spring, which not only has good elasticity, but can also be directly sleeved on the spiral rod 420, making it easy to install, and not easy to fall off from the adjustment area, making it more stable. Of course, in other embodiments of the present application, the elastic member 6 can also be a spring, a gas pressure rod, rubber, etc.

[0040] In some embodiments of the present application, the spiral rod 420 is fixedly connected to the front sleeve 4, the transmission member 520 is rotatably arranged on the rear sleeve 5, and the stepless adjustment mechanism also includes a locking member 530; the stepless adjustment mechanism includes a switchable active state and a locked state, in the active state, the locking member 530 avoids the transmission member 520, and the transmission member 520 can rotate freely, so that the spiral rod 420 can move forward and backward relative to the transmission member 520; in the locked state, the locking member 530 locks the transmission member 520, and the transmission member 520 is relatively fixed, so that the spiral rod 420 screwed to the transmission member 520 cannot slide forward and backward, thereby making the position of the backrest 1 relatively fixed.

[0041] In this embodiment, a locking member 530 is provided to lock or release the transmission member 520, so that when the user adjusts the backrest 1 to a comfortable position, the position of the backrest 1 can be fixed by adjusting the locking member 530, without repeatedly adjusting the backrest 1 during multiple uses, thereby making the adjustment operation of the backrest 1 easier.

[0042] Among them, the spiral rod 420 includes a clamping portion 422 with a conical protrusion at the front end, and the interior of the front sleeve 4 is recessed with a recessed portion 401 that is clamped with the clamping portion 422, and screw holes 402 are provided on both the clamping portion 422 and the recessed portion 401; when the clamping portion 422 is clamped into the recessed portion 401, the screw holes 402 thereon are aligned, and screws are screwed in to achieve fixation between the two; thereby, not only the connection strength between the spiral rod 420 and the front sleeve 4 is improved, but also the installation and disassembly operations between the spiral rod 420 and the front sleeve 4 are relatively simple.

[0043] In some embodiments of the present application, a plurality of stop members 521 are provided on the outer wall of the transmission member 520, and a stop groove 522 is formed at the interval between any two stop members 521 connected along the circumference of the transmission member 520. The locking member 530 is a tubular structure, and the locking member 530 is sleeved on the rear end of the rear sleeve 5 and can slide forward and backward relative to the rear sleeve 5, and the tube wall of the locking member 530 extends axially toward the front end to form a clamping head 531; in the locked state, the locking member 530 slides forward relative to the rear sleeve 5 until the clamping head 531 is clamped into the stop groove 522, and the transmission member 520 and the locking member 530 are relatively fixed; in the active state, the locking member 530 slides backward relative to the rear sleeve 5 until the clamping head 531 avoids the stop groove 522, and the transmission member 520 can rotate freely.

[0044] In this embodiment, by setting the locking member 530 as a tubular structure and sleeved on the rear end of the rear sleeve 5, the switching between the locked state and the active state can be achieved by sliding the locking member 530 forward and backward, which is simple and convenient to operate.

[0045] In some embodiments of the present application, a partition 540 is vertically arranged in the middle of the second accommodating area 510, and a first avoidance opening 541 is opened in the center of the partition 540, and the first avoidance opening 541 is configured to avoid the spiral rod 420. The partition 540 is used as a dividing surface, and the second accommodating area 510 includes an adjusting portion 511 on the front side and a locking portion 512 on the rear side. The adjusting portion 511 is also sleeved with a positioning sleeve 550, and the interval between the positioning sleeve 550 and the partition 540 forms a positioning area. The transmission member 520 is arranged in the positioning area, and the positioning area is configured to position the transmission member 520 in the horizontal direction; the locking member 530 is connected to the locking portion 512, and a second avoidance opening 542 for avoiding the clamping head 531 is opened on the outer side of the partition 540.

[0046] In this embodiment, the transmission member 420 is arranged in the positioning area formed by the combination of the positioning sleeve 550 and the partition 540, so that the transmission member 520 remains fixed in the horizontal direction during the rotation or locking process, thereby preventing the transmission member 520 from being driven out of the rear sleeve 5 when the spiral rod 420 slides back and forth, resulting in the front sleeve 4 and the rear sleeve 5 being unable to be fixed, thereby improving the stability of the stepless adjustment mechanism.

[0047] Among them, a stop screw 506 is threadedly connected to the position of the rear sleeve 5 opposite to the locking portion 512, and the screw portion of the stop screw 506 is inserted into the locking portion 512. A sliding groove 532 extending along the front-to-back direction is opened on the side wall of the locking piece 530. When the locking piece 530 is inserted into the locking portion 512, the screw portion of the stop screw 506 passes through the sliding groove 532, so that when the locking piece 530 slides back and forth on the rear sleeve 5, the locking piece 530 slides back and forth relative to the stop screw 506, and the sliding groove 532 is stopped by the stop screw 506, so that the locking piece 530 cannot fall out of the rear sleeve 5 or rotate circumferentially, thereby improving the stability of the stepless adjustment mechanism.

[0048] In some embodiments of the present application, a positioning assembly is arranged between the positioning sleeve 550 and the rear sleeve 5, and the positioning assembly includes a positioning protrusion 551 and a positioning groove 501 that are snap-fitted with each other, the positioning protrusion 551 protrudes from one of the positioning sleeve 550 and the rear sleeve 5, and the positioning groove 501 is opened in the other one of the positioning sleeve 550 and the rear sleeve 5.

[0049] In this embodiment, the positioning sleeve 550 and the rear sleeve 5 are snap-fitted together through the positioning assembly, making the installation and disassembly operations of the positioning sleeve 550 easier, and preventing the positioning sleeve 550 from sliding too deep during installation, causing the positioning area to be too narrow, and the transmission member 520 being squeezed by the positioning sleeve 550 and unable to rotate.

[0050] Among them, preferably, four positioning protrusions 551 extend outward from the front end of the positioning sleeve 550, four positioning grooves 501 are opened at the front end of the rear sleeve 5, and the front side opening of the positioning groove 501 is set, so that when the positioning sleeve 550 is inserted into the rear sleeve 5 from the rear, the positioning protrusion 551 can be inserted from the opening of the positioning groove 501, further improving the convenience of the installation operation of the positioning sleeve 550.

[0051] In some embodiments of the present application, at least two clamps 531 extend from the tube wall of the locking member 530. This makes the connection strength between the locking member 530 and the transmission member 520 higher in the locked state, thereby improving the stability of the stepless adjustment mechanism.

[0052] Preferably, six clamps 531 extend from the locking member 530, and six corresponding second avoidance openings 542 are provided on the partition plate 540 to ensure that the connection between the locking member 530 and the transmission member 520 is stable in the locked state. Of course, in other embodiments of the present application, the number of clamps 531 on the locking member 530 can also be five, seven, etc.

[0053] In some embodiments of the present application, a stop plate 421 is connected to the rear end of the screw rod 420, the shaft diameter of the stop plate is larger than the first avoidance opening 541, and the stop plate 421 is configured to prevent the screw rod 420 from escaping from the first avoidance opening 541. By providing the stop plate 421, when the front sleeve 4 moves forward to the maximum distance, the stop plate 421 on the rear side of the screw rod 420 abuts against the partition plate 540, thereby preventing the screw rod 420 from sliding forward out of the first avoidance opening 541, causing the front sleeve 4 and the rear sleeve 5 to separate, thereby improving the stability of the stepless adjustment mechanism.

[0054] In some embodiments of the present application, a tubular outer portion 502 is provided at the front end of the rear sleeve 5, and the diameter of the outer portion 502 is larger than that of the front sleeve 4. When the front sleeve 4 is sleeved on the rear sleeve 5, the rear end of the front sleeve 4 is clamped between the outer portion 502 and the rear sleeve 5. The front sleeve 4 is limited by the outer portion 502 and is not easy to shake left and right relative to the rear sleeve 5, further improving the connection strength between the front sleeve 4 and the rear sleeve 5.

[0055] Among them, a scale is set on the outer wall of the front sleeve 4. When the front sleeve 4 slides forward and backward relative to the rear sleeve 5, the front end of the outer portion 502 blocks the scale. The user can understand the sliding length of the backrest 1 forward and backward according to the length of the scale exposed on the front sleeve 4, thereby improving human-computer interaction.

[0056] In some embodiments of the present application, a mounting groove 310 inclined toward the upper rearward direction is provided at the rear end of the seat 3, and the lower end of the support frame 2 is bent forward and downward to form a bending portion 210. The bending portion 210 is slidably engaged with the seat 3 through the mounting groove 310, so that the support frame 2 can slide relative to the seat 3.

[0057] In this embodiment, the bending portion 210 can slide relative to the seat 3, and the bending portion 210 is inclined forward and downward, so that when the support frame 2 slides, the backrest 1 slides along the inclined direction of the bending portion 210, which can not only further adjust the horizontal position of the backrest 1, but also adjust the vertical height of the backrest 1, thereby improving the freedom of adjustment of the backrest 1.

[0058] In some embodiments of the present application, a guide groove 211 is provided on the bending portion 210 along the length direction, and a knob screw 320 is provided on the seat 3. The knob screw 320 passes through and is screwed to the seat 3 and the guide groove 211. The knob screw 320 is configured to lock or loosen the bending portion 210. By turning the knob screw 320, the locking or movement between the bending portion 210 and the seat 3 can be adjusted, so that the adjustment operation of the support frame 2 is relatively simple.

[0059] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate positions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means more than three.

[0060] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. An aesthetically pleasing seat with a stepless backrest adjustment, characterized in that: The invention comprises a backrest (1), a support frame (2) and a seat (3), wherein the rear side of the backrest (1) is connected to a front sleeve (4), the lower end of the support frame (2) is connected to the seat (3), the upper end of the support frame (2) is connected to a rear sleeve (5), the front sleeve (4) is sleeved on the rear sleeve (5) and the front sleeve (4) can slide forward and backward relative to the rear sleeve (5), thereby driving the backrest (1) to move forward and backward relative to the seat (3); the hollow part of the front sleeve (4) is a first accommodating area (410), and the hollow part of the rear sleeve (5) is a second accommodating area (510); when the front sleeve (4) is sleeved on the rear sleeve (5), the first accommodating area (410) and the second accommodating area (510) are interconnected and combined to form an adjustment area; a stepless adjustment mechanism is arranged in the adjustment area, and the stepless adjustment mechanism The mechanism comprises a screw rod (420), a transmission member (520) and an elastic member (6); the screw rod (420) is axially arranged in the first accommodating area (410); the transmission member (520) is a ring-shaped structure with an inner spiral; the transmission member (520) is connected to the second accommodating area (510); the screw rod (420) and the transmission member (520) are spirally matched; the screw rod (420) or the transmission member (520) can rotate in the circumferential direction, so that the screw rod (420) can move forward and backward relative to the transmission member (520), thereby realizing stepless adjustment between the front sleeve (4) and the rear sleeve (5); the two ends of the elastic member (6) act on the front sleeve (4) and the rear sleeve (5) respectively, so that the front sleeve (4) can be reset with the help of the elastic force of the elastic member (6).

2. The aesthetically pleasing seat with stepless backrest adjustment according to claim 1, characterized in that: The spiral rod (420) is fixedly connected to the front sleeve (4), the transmission member (520) is rotatably arranged on the rear sleeve (5), and the stepless adjustment mechanism further comprises a locking member (530); the stepless adjustment mechanism comprises a switchable active state and a locked state; in the active state, the locking member (530) avoids the transmission member (520), and the transmission member (520) can rotate freely, so that the spiral rod (420) can move forward and backward relative to the transmission member (520); in the locked state, the locking member (530) locks the transmission member (520), and the transmission member (520) is relatively fixed in the circumferential direction, so that the spiral rod (420) screwed to the transmission member (520) cannot slide forward and backward, thereby making the position of the backrest (1) relatively fixed.

3. The aesthetically pleasing seat with stepless backrest adjustment according to claim 2, characterized in that: A plurality of stoppers (521) are arranged on the outer wall of the transmission member (520); a stop groove (522) is formed at the interval between any two stoppers (521) connected in the circumferential direction of the transmission member (520); the locking member (530) is a tubular structure; the locking member (530) is sleeved on the rear end of the rear sleeve (5) and can slide forward and backward relative to the rear sleeve (5); the tubular wall of the locking member (530) extends axially toward the front end to form a clamping head (531); in a locked state, the locking member (530) slides forward relative to the rear sleeve (5) until the clamping head (531) is clamped into the stop groove (522), and the transmission member (520) and the locking member (530) are relatively fixed; in an active state, the locking member (530) slides backward relative to the rear sleeve (5) until the clamping head (531) clears the stop groove (522), and the transmission member (520) can rotate freely.

4. The aesthetically pleasing seat with a stepless backrest adjustment according to claim 3, characterized in that: A partition (540) is vertically arranged in the middle of the second accommodating area (510), and a first avoidance opening (541) is opened in the center of the partition (540), and the first avoidance opening (541) is configured to avoid the spiral rod (420). The partition (540) is used as a dividing surface. The second accommodating area (510) includes an adjusting portion (511) on the front side and a locking portion (512) on the rear side. The adjusting portion (511) is also sleeved with a positioning sleeve (550), and the interval between the positioning sleeve (550) and the partition (540) forms a positioning area. The transmission member (520) is arranged in the positioning area, and the positioning area is configured to position the transmission member (520) in the horizontal direction; the locking member (530) is connected to the locking portion (512), and a second avoidance opening (542) for avoiding the clamping head (531) is opened on the outer side of the partition (540).

5. The aesthetically pleasing seat with stepless backrest adjustment according to claim 4, characterized in that: A positioning assembly is provided between the positioning sleeve (550) and the rear sleeve (5), the positioning assembly comprising a positioning protrusion (551) and a positioning groove (501) which are engaged with each other, the positioning protrusion (551) protruding from one of the positioning sleeve (550) and the rear sleeve (5), and the positioning groove (501) being provided in the other of the positioning sleeve (550) and the rear sleeve (5).

6. The aesthetically pleasing seat with a continuously variable backrest adjustment according to claim 3, characterized in that: At least two clamping heads (531) extend from the tube wall of the locking piece (530).

7. The aesthetically pleasing seat with a stepless backrest adjustment according to claim 4, characterized in that: A stop plate (421) is connected to the rear end of the spiral rod (420); the shaft diameter of the stop plate is larger than the first avoidance opening (541); and the stop plate (421) is configured to prevent the spiral rod (420) from escaping from the first avoidance opening (541).

8. The aesthetically pleasing seat with a continuously variable backrest adjustment according to claim 1, characterized in that: The front end of the rear sleeve (5) is provided with a tubular outer portion (502), the diameter of the outer portion (502) being larger than that of the front sleeve (4), and when the front sleeve (4) is sleeved on the rear sleeve (5), the rear end of the front sleeve (4) is clamped between the outer portion (502) and the rear sleeve (5).

9. The aesthetically pleasing seat with stepless backrest adjustment according to claim 1, characterized in that: The rear end of the seat (3) is provided with a mounting groove (310) inclined toward the rear and upward, and the lower end of the support frame (2) is bent forward and downward to form a bent portion (210), and the bent portion (210) is slidably engaged with the seat (3) through the mounting groove (310), so that the support frame (2) can slide relative to the seat (3).

10. The aesthetically pleasing seat with a continuously variable backrest adjustment according to claim 9, characterized in that: A guide groove (211) is provided on the bending portion (210) along the length direction, and a knob screw (320) is provided on the seat (3). The knob screw (320) passes through and is screwed to the seat (3) and the guide groove (211), and the knob screw (320) is configured to lock or loosen the bending portion (210).

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