Telescopic supporting device and seat

Abstract

The telescopic supporting device comprises a carrier, a connecting base and supporting rods, the left side and the right side of the connecting base are each provided with two sliding grooves extending in the left-right direction, and the connecting base and the carrier are connected through at least one pair of supporting rods which are symmetrical in the left-right direction; the front ends of each pair of supporting rods in bilateral symmetry are hinged to the back side of the carrier, and the rear ends of each pair of supporting rods in bilateral symmetry are slidably connected to the sliding grooves in the left side and the right side respectively, so that a four-connecting-rod two-sliding-groove mechanism is formed among the carrier, the connecting base and the supporting rods; the carrier is driven by the front end of the supporting rod to be ejected forwards or contracted inwards; a gear adjusting mechanism is further arranged between the supporting rod and the carrier. According to the telescopic supporting device and the seat, the structure is simpler, power consumption is not needed, the cost is low, the service life is longer, vibration and noise cannot be generated in the using process, and the supporting effect is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a telescopic supporting device and a seat. Background Art

[0002] As is known to all, in order to provide a more comfortable sitting experience, existing chairs usually add a lumbar support to the backrest to support the user's waist. However, since the gap between the waist and the backrest varies for users of different body shapes, the fixed lumbar support cannot meet the needs of different users.

[0003] In order to solve the above problems, the existing market provides a seat with a lumbar support mechanism, which adds a lumbar support on the backrest. The lumbar support includes an outer airbag and an inner motor. The outer airbag not only provides a softer support for the user, but also drives the inner motor to inflate or deflate the airbag, thereby controlling the airbag to push forward or retract inward. The user can adjust the lumbar support to fit his or her waist.

[0004] However, this solution has the following defects: the use of motors not only increases the production cost of the seat, but also the motor itself has a short service life and is more troublesome to maintain; furthermore, the process of inflating and deflating the airbag by the motor will produce greater vibration and noise, affecting the customer's experience; not only that, the airbag is prone to aging, has a short service life, and is relatively soft and cannot provide the user with more stable support. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a telescopic support device and a seat, by forming a four-bar and two-slide mechanism between the carrier, the connecting seat and the support rod, and adjusting the front and rear position of the carrier by mechanical transmission, which is not only simpler in structure, but also does not require electricity and has a lower cost; it also does not require maintenance and has a longer service life; and, no vibration and noise are generated during the transmission process of the various mechanisms, and the user experience is better; not only that, after the gear adjustment mechanism locks the support rod, the various components of the telescopic support device are relatively fixed and cannot move, thereby providing stable support for the user.

[0006] The effect of the utility model is achieved in this way:

[0007] In the first aspect, the present application provides a telescopic support device, including a carrier, a connecting seat and a support rod, wherein two sliding grooves extending in the left and right directions are respectively provided on the left and right sides of the connecting seat, and the connecting seat and the carrier are connected by at least one pair of left-right symmetrical support rods, and the front end of each pair of left-right symmetrical support rods is hinged to the back side of the carrier, and the rear end is slidably connected to the sliding grooves on the left and right sides, so that a four-bar two-slide groove mechanism is formed between the carrier, the connecting seat and the support rod, so that when the rear ends of the left-right symmetrical support rods are retracted inward or expanded outward along the sliding grooves, the carrier is driven by the front end of the support rod to be pushed forward or retracted inward; a gear adjustment mechanism is also provided between the support rod and the carrier, and the gear adjustment mechanism is configured to adjust the locking or movement of the support rod.

[0008] Furthermore, the gear adjustment mechanism includes a gear piece and a clamping block. The gear piece is provided with a plurality of gear holes in the horizontal direction. The rear ends of a pair of left-right symmetrical support rods are respectively hinged with gear pieces. The gear pieces on the left and right sides fit each other in the front-back direction. The gear pieces are retracted inward or expanded outward with the sliding of the support rod. The clamping block is movably arranged on the connecting seat. A clamping head protrudes from the clamping block and engages with the gear hole. The telescopic support device has a switchable active state and a locked state. When in the active state, the clamping block avoids the gear piece and the gear piece can slide freely. When in the locked state, the clamping block slides toward the gear piece, and the clamping head engages with the gear holes of the two gear pieces, so that the two gear pieces are relatively fixed, thereby driving the support rod and the carrier to be relatively fixed. The support rod is locked or released by the clamping engagement between the clamping block and the gear piece. The structure is simple and the stability is good after locking. The gear adjustment operation is relatively simple.

[0009] Furthermore, a first connecting groove is formed on the connecting seat in the horizontal direction, the groove wall of the first connecting groove is connected to the sliding groove, the shifting member is connected to the first connecting groove and can slide left and right in the first connecting groove; a second connecting groove is formed on the connecting seat in the vertical direction, the clamping block is connected to the second connecting groove and can slide up and down in the second connecting groove, the second connecting groove is connected to the first connecting groove through a through hole, and in the locked state, the clamping head penetrates the first connecting groove through the through hole and is clamped into the shifting hole. The shifting member and the clamping block are constrained by the first connecting groove and the second connecting groove, so that the connection strength between the shifting member, the clamping block and the connecting seat and the movement direction of the shifting member and the clamping block are more stable.

[0010] Furthermore, a pair of symmetrical support rods are provided with balance rods, the front ends of the two balance rods are hinged to the support rods, the ends of the two balance rods are connected in series and hinged to the connecting seat, and the balance rods are configured to balance the movement of the support rods on the left and right sides. The support rods on both sides are constrained by the support rods to slide the same distance during the sliding process, so that the carrier can move forward or backward in translation, ensuring that the carrier is always in a suitable posture.

[0011] Furthermore, a third connection slot is provided on the connection seat along the front-to-back direction, and the ends of the two balancing rods are connected in series and connected to the third connection slot. When the support rods on both sides are retracted inward or expanded outward, the ends of the balancing rods slide downward or upward in the third connection slot, so that the balancing rods can slide up and down in coordination with the left and right sliding of the support rods, thereby making the transmission coordination between the support rods and the balancing rods more reasonable and ensuring the smooth sliding process of the support rods.

[0012] Furthermore, a clearance opening is provided at the front end of the balancing pole, and the clearance opening is configured to clear the front end of the support pole. The support pole can slide until the front end fits in the clearance opening, so that the support pole can slide a farther distance, thereby allowing the carrier to be adjusted inward to a deeper depth.

[0013] Furthermore, an elastic member is provided between the support rod and the carrier, one end of the elastic member acts on the carrier, and the other end acts on the support rod, so that the support rods on the left and right sides always have a tendency to be retracted inwards, thereby driving the carrier to always have a tendency to be pushed forward. The carrier can automatically return to the initial position with the elastic force of the elastic member, and the adjustment operation of the carrier is more convenient.

[0014] Furthermore, two support rods are arranged on either side of the left or right sides of the connecting seat, and the two support rods on the same side are connected by a pin, so that the connection strength between the support rod, the connecting seat and the carrier is higher, and the strength of the telescopic support device is improved.

[0015] In the second aspect, the present application provides a chair, including a backrest, a seat and a telescopic support device, a mounting groove is provided on the front end surface of the backrest, a connecting seat is installed in the mounting groove, and a carrier can move forward and backward relative to the backrest to support the user's waist. When applied to the chair, the carrier is a base for installing the waist support, a sponge and a covering cloth outside the sponge can be installed on the base, and structures such as the connecting seat and the support rod are hidden between the carrier and the mounting groove and are not exposed, thereby making the appearance of the chair more integrated and beautiful.

[0016] Furthermore, the backrest is provided with a pull-wire mechanism, which includes a pull-wire and an adjustment switch. The adjustment switch is provided on one of the left and right sides of the backrest. One end of the pull-wire passes through the connection seat and is connected to the card block, and the other end is connected to the adjustment switch. The adjustment switch is configured to tighten or loosen the pull-wire, thereby adjusting the card block to slide up or down. The card block can be adjusted to slide up and down by simply toggling the adjustment switch, thereby adjusting the telescopic support device to switch between the locked state and the active state, making the adjustment operation of the telescopic support device more convenient; and the adjustment switch is exposed at the side end of the backrest, which is convenient for the user to operate when sitting on the seat.

[0017] The telescopic support device and seat provided by the present application form a four-link two-slide mechanism between the carrier, the connecting seat and the support rod. Compared with the method of adjusting the airbag with a motor, the front and rear position of the carrier is adjusted by mechanical transmission. Not only is the structure simpler, but also no electricity consumption is required, the cost is low, and maintenance is not required, and the service life is longer; moreover, no vibration and noise are generated during the transmission process of each mechanism, and the user experience is better; not only that, the structure of the carrier itself will not change during the adjustment process, and after the gear adjustment mechanism locks the support rod, the components of the telescopic support device are relatively fixed and cannot move, thereby providing stable support for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a seat provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the connection structure between the backrest and the carrier provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the internal structure of a backrest provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the connection structure between the connection base and the carrier provided in an embodiment of the present application;

[0023] Figure 5 A schematic cross-sectional structure diagram of the telescopic support device in the initial position provided in an embodiment of the present application;

[0024] Figure 6 A schematic cross-sectional structure diagram of the telescopic support device at the deepest position provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the three-dimensional structure of the connecting seat and the support rod provided in the embodiment of the present application;

[0026] Figure 8 A schematic diagram of the connection structure between the shift member and the clamping block provided in an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of the three-dimensional structure of the gear member provided in the embodiment of the present application;

[0028] Fig.10 A schematic diagram of the three-dimensional structure of the connecting socket provided in an embodiment of the present application.

[0029] The figures are marked as follows: 1-carrier, 2-connecting seat, 210-sliding groove, 220-block, 221-clip head, 230-first connecting groove, 240-second connecting groove, 241-through hole, 250-third connecting groove, 3-support rod, 310-gear member, 311-gear hole, 320-balance rod, 321-avoidance, 330-elastic member, 340-pin shaft, 4-backrest, 410-installation groove, 420-pull wire, 421-adjustment switch, 5-seat. DETAILED DESCRIPTION

[0030] 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.

[0031] Please refer to the attached Figure 1-10 The embodiment of the present application provides a telescopic support device, including a carrier 1, a connecting seat 2 and a support rod 3. Two sliding grooves 210 extending in the left and right directions are respectively provided on the left and right sides of the connecting seat 2. The connecting seat 2 and the carrier 1 are connected by at least one pair of left-right symmetrical support rods 3. The front end of each pair of left-right symmetrical support rods 3 is hinged to the back side of the carrier 1, and the rear end is slidably connected to the sliding grooves 210 on the left and right sides, so that a four-link two-slide groove mechanism is formed between the carrier 1, the connecting seat 2 and the support rod 3, so that when the rear ends of the left-right symmetrical support rods 3 are retracted inwardly or expanded outwardly along the sliding grooves 210, the carrier 1 is driven by the front end of the support rod 3 to be pushed forward or retracted inward; a gear adjustment mechanism is also provided between the support rod 3 and the carrier 1, and the gear adjustment mechanism is configured to adjust the locking or activity of the support rod 3.

[0032] In this embodiment, a four-link two-slide mechanism is formed between the carrier 1, the connecting seat 2 and the support rod 3. Compared with the method of adjusting the airbag by a motor, the front and rear position of the carrier 1 is adjusted by mechanical transmission. Not only is the structure simpler, but also no electricity consumption is required, the cost is low, and no maintenance is required, and the service life is longer; moreover, no vibration and noise are generated during the transmission process of each mechanism, and the user experience is better; not only that, the structure of the carrier 1 itself will not change during the adjustment process, and after the gear adjustment mechanism locks the support rod 3, the components of the telescopic support device are relatively fixed and cannot move, thereby providing stable support for the user.

[0033] In some embodiments of the present application, the gear adjustment mechanism includes a gear member 310 and a clamping block 220. The gear member 310 is provided with a plurality of gear holes 311 in the horizontal direction. The rear ends of a pair of left-right symmetrical support rods 3 are respectively hinged with gear members 310. The gear members 310 on the left and right sides fit each other in the front-back direction. The gear members 310 are retracted inward or expanded outward with the sliding of the support rods 3. The clamping block 220 is movably arranged on the connecting seat 2. The clamping block 220 has a protruding The clamping head 221 is engaged with the gear hole 311; the telescopic support device has a switchable active state and a locked state. When in the active state, the clamping block 220 avoids the gear member 310, and the gear member 310 can slide freely; when in the locked state, the clamping block 220 slides toward the gear member 310, and the clamping head 221 is engaged with the gear holes 311 of the two gear members 310, so that the two gear members 310 are relatively fixed, thereby driving the support rod 3 and the carrier 1 to be relatively fixed.

[0034] In this embodiment, the support rod 3 is locked or released by means of the engagement between the block 220 and the shift member 310, which has a simple structure and good stability after locking; moreover, the active state and the locked state of the telescopic support device can be switched only by moving the block 220, making the shift adjustment operation relatively simple.

[0035] Preferably, the cross-sectional shapes of the gear hole 311 and the clamp head 221 are both rhombus-shaped, so that the two cannot rotate relative to each other after the clamp head 221 is clamped into the gear hole 311, and the connection strength is good. Of course, in other embodiments of the present application, the cross-sectional shapes of the gear hole 311 and the clamp head 221 can also be triangular, elliptical, etc.

[0036] Among them, any two connected shift holes 311 on the shift member 310 are interconnected, and several shift holes 311 are interconnected to form a complete toothed groove, so that in the locked state, the shift holes 311 on the two shift members 310 are easier to overlap, thereby facilitating the clamping head 221 to be clamped into the shift hole 311 to achieve locking.

[0037] The number of the gear holes 311 on the gear member 310 can be five, six, seven, etc. Preferably, the gear member 310 has eight gear holes 311 to ensure that the gear adjustment mechanism has a sufficiently high degree of adjustment freedom, and the adjustment range of the carrier 1 can meet the needs of various users.

[0038] In some embodiments of the present application, a first connecting groove 230 is provided on the connecting seat 2 starting from the horizontal direction, the groove wall of the first connecting groove 230 is connected to the sliding groove 210, and the shift member 310 is connected to the first connecting groove 230 and can slide left and right in the first connecting groove 230; a second connecting groove 240 is opened on the connecting seat 2 in the vertical direction, the clamping block 220 is connected to the second connecting groove 240 and can slide up and down in the second connecting groove 240, the second connecting groove 240 and the first connecting groove 230 are connected through a through hole 241, and in the locked state, the clamping head 221 penetrates into the first connecting groove 230 through the through hole 241 and is clamped into the shift hole 311.

[0039] In this embodiment, the first connecting groove 230 and the second connecting groove 240 are provided on the connecting base 2 to constrain the shift member 310 and the block 220, so that the connection strength between the shift member 310, the block 220 and the connecting base 2 and the movement direction of the shift member 310 and the block 220 are more stable, thereby preventing the clamping head 221 from being unable to smoothly fit into the shift hole 331 due to the deviation of the moving direction of the shift member 310 or the block 220, thereby preventing the telescopic support device from being unable to enter the locked state.

[0040] The shape of the through hole 241 is consistent with the cross-sectional shape of the shift hole 331 and the clamping head 221 , so as to ensure that the clamping head 221 can smoothly penetrate into or out of the through hole 241 .

[0041] In some embodiments of the present application, a balance rod 320 is respectively provided on a pair of left-right symmetrical support rods 3, the front ends of the two balance rods 320 are hinged to the support rods 3, the ends of the two balance rods 320 are connected in series and hinged to the connecting seat 2, and the balance rod 320 is configured to balance the movement of the left and right support rods 3.

[0042] In this embodiment, two balance rods 320 of the same length are provided to respectively connect the support rods 3 on the left and right sides, so that the support rods 3 are constrained by the support rods 3 during the sliding process, and the ends of the two balance rods 320 are hinged at the same position on the connecting seat 2, so that the balance rods 320 on the left and right sides can rotate at the same angle when rotating, driving the support rods 3 on both sides to slide the same distance, thereby allowing the carrier 1 to move forward or backward in a translational manner, ensuring that the carrier 1 is always in a suitable posture.

[0043] In some embodiments of the present application, a third connecting groove 250 is opened on the connecting seat 2 along the front-to-back direction, and the ends of the two balance rods 320 are connected in series and connected to the third connecting groove 250. When the support rods 3 on both sides are retracted inward or expanded outward, the ends of the balance rods 320 slide downward or upward in the third connecting groove 250.

[0044] In this embodiment, since the support rod 3 and the balance rod 320 are straight rods and the sliding groove 210 is a straight groove, if the end of the balance rod 320 remains fixed, the support rod 3 cannot slide along the sliding groove 210; therefore, by setting the third connecting groove 250, the balance rod 320 can slide up and down in coordination with the left and right sliding of the support rod 3, thereby making the transmission coordination between the support rod 3 and the balance rod 320 more reasonable, ensuring that the sliding process of the support rod 3 is smooth.

[0045] In some embodiments of the present application, a clearance opening 321 is provided at the front end of the balancing pole 320 , and the clearance opening 321 is configured to avoid the front end of the supporting pole 3 .

[0046] In this embodiment, by setting the avoidance opening 321, the support rod 3 can slide until the front end fits in the avoidance opening 321, so that the support rod 3 can slide a farther distance, thereby allowing the carrier 1 to be adjusted inward to a deeper depth, thereby improving the adjustment range of the carrier 1.

[0047] In some embodiments of the present application, an elastic member 330 is arranged between the support rod 3 and the carrier 1, and one end of the elastic member 330 acts on the carrier 1, and the other end acts on the support rod 3, so that the support rods 3 on the left and right sides always have a tendency to retract inwardly toward each other, thereby driving the carrier 1 to always have a tendency to push forward.

[0048] In this embodiment, by providing the elastic member 330, the carrier 1 always has a tendency to be pushed forward, so that when the carrier 1 is released in the active state, the carrier 1 can automatically return to the initial position with the help of the elastic force of the elastic member 330; in the process of adjusting the position of the carrier 1, the user only needs to push the carrier 1 inwards to slowly find a suitable position with the help of the elastic force of the elastic member 330, thereby improving the convenience of the adjustment operation of the carrier 1.

[0049] In some embodiments of the present application, preferably, two support rods 3 are provided on either side of the left or right sides of the connecting seat 2 , and the two support rods 3 on the same side are connected by a pin shaft 340 .

[0050] In this embodiment, two mutually fixed support rods 3 are connected to either side of the connection base 2, and the support rods 3 are connected to the connection base 2 and the carrier 1 through the pin 340, which increases the contact area between the three, makes the connection strength between the three higher, and improves the strength of the telescopic support device. Of course, in other embodiments of the present application, the number of support rods 3 on either side of the left and right sides of the connection base 2 can also be three, four, etc.

[0051] The embodiment of the present application also provides a seat, including a backrest 4, a seat 5 and a telescopic support device. A mounting groove 410 is provided on the front end surface of the backrest 4, the connecting seat 2 is installed in the mounting groove 410, and the carrier 1 can move forward and backward relative to the backrest 4.

[0052] In this embodiment, a mounting groove 410 is opened on the seat back 4 and the connecting seat 2 is installed in the mounting groove 410, so that the connecting seat 2 and structures such as the support rod 3 are hidden between the carrier 1 and the mounting groove 410 and are not exposed, thereby making the appearance of the seat more integrated and beautiful.

[0053] The carrier 1 can not only be used as a lumbar support of the seat, but in other embodiments of the present embodiment, the carrier 1 can also be a backrest, a headrest, etc. of the seat.

[0054] In some embodiments of the present application, the backrest 4 is provided with a pull wire mechanism, which includes a pull wire 420 and an adjustment switch 421. The adjustment switch 421 is arranged on one of the left and right sides of the backrest 4. One end of the pull wire 420 passes through the connecting seat 2 and is connected to the block 220, and the other end is connected to the adjustment switch 421. The adjustment switch 421 is configured to tighten or loosen the pull wire 420, thereby adjusting the block 220 to slide upward or downward.

[0055] In this embodiment, the block 220 can be adjusted to slide up and down by simply toggling the adjustment switch 421, thereby adjusting the telescopic support device to switch between the locked state and the active state, making the adjustment operation of the telescopic support device more convenient; and the adjustment switch 421 is exposed at the side end of the backrest 4, which is convenient for the user to operate when sitting on the seat.

[0056] 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 orientations or positional relationships are based on the orientations 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.

[0057] 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. A telescopic support device, characterized in that: The invention comprises a carrier (1), a connecting seat (2) and a support rod (3), wherein two sliding grooves (210) extending in the left and right directions are respectively provided on the left and right sides of the connecting seat (2), and the connecting seat (2) and the carrier (1) are connected via at least one pair of left-right symmetrical support rods (3), and the front end of each pair of left-right symmetrical support rods (3) is hinged to the back side of the carrier (1), and the rear end is respectively slidably connected to the sliding grooves (210) on the left and right sides, so that a four-link two-slide groove mechanism is formed between the carrier (1), the connecting seat (2) and the support rod (3), so that when the rear ends of the left-right symmetrical support rods (3) are mutually retracted inwardly or expanded outwardly along the sliding grooves (210), the carrier (1) is driven by the front ends of the support rods (3) to be pushed forward or retracted inwardly; a gear adjustment mechanism is also provided between the support rods (3) and the carrier (1), and the gear adjustment mechanism is configured to adjust the locking or movement of the support rods (3).

2. The telescopic support device according to claim 1, characterized in that: The gear adjustment mechanism comprises a gear member (310) and a clamping block (220); a plurality of gear holes (311) are provided on the gear member (310) in a horizontal direction; the rear ends of a pair of left-right symmetrical support rods (3) are respectively hingedly connected with the gear members (310); the gear members (310) on the left and right sides are fitted with each other in a front-back direction; the gear members (310) are retracted inwardly or expanded outwardly with the sliding of the support rods (3); the clamping block (220) is movably arranged on the connecting seat (2); a plurality of gear holes (311) are protruded on the clamping block (220) and are in contact with the gear holes (311) ) a clamping head (221) that engages with the two gear members (310); the telescopic support device has a switchable active state and a locked state. When in the active state, the clamping block (220) avoids the shift member (310), and the shift member (310) can slide freely; when in the locked state, the clamping block (220) slides toward the shift member (310), and the clamping head (221) is engaged with the shift holes (311) of the two shift members (310), so that the two shift members (310) are relatively fixed, thereby driving the support rod (3) and the carrier (1) to be relatively fixed.

3. The telescopic support device according to claim 2, characterized in that: The connecting seat (2) is provided with a first connecting groove (230) in the horizontal direction, the groove wall of the first connecting groove (230) is connected to the sliding groove (210), and the shift member (310) is connected to the first connecting groove (230) and can slide left and right in the first connecting groove (230); the connecting seat (2) is provided with a second connecting groove (240) in the vertical direction, the clamping block (220) is connected to the second connecting groove (240) and can slide up and down in the second connecting groove (240), the second connecting groove (240) and the first connecting groove (230) are connected via a through hole (241), and in a locked state, the clamping head (221) penetrates into the first connecting groove (230) through the through hole (241) and is clamped into the shift hole (311).

4. The telescopic support device according to claim 1, characterized in that: A balancing rod (320) is respectively provided on a pair of left-right symmetrical support rods (3), the front ends of the two balancing rods (320) are hinged to the support rods (3), the ends of the two balancing rods (320) are connected in series and hinged to the connecting seat (2), and the balancing rod (320) is configured to balance the movement of the support rods (3) on the left and right sides.

5. The telescopic support device according to claim 4, characterized in that: A third connecting groove (250) is provided on the connecting seat (2) along the front-to-back direction, and the ends of the two balancing rods (320) are connected in series and connected to the third connecting groove (250). When the support rods (3) on both sides are retracted inwardly or expanded outwardly, the ends of the balancing rods (320) slide downwardly or upwardly in the third connecting groove (250).

6. The telescopic support device according to claim 4, characterized in that: The front end of the balancing rod (320) is provided with an escape opening (321), and the escape opening (321) is configured to escape the front end of the supporting rod (3).

7. The telescopic support device according to claim 1, characterized in that: An elastic member (330) is provided between the support rod (3) and the carrier (1); one end of the elastic member (330) acts on the carrier (1) and the other end acts on the support rod (3), so that the support rods (3) on the left and right sides always have a tendency to be retracted inwards, thereby driving the carrier (1) to always have a tendency to be pushed forward.

8. The telescopic support device according to claim 1, characterized in that: Two support rods (3) are provided on either side of the left or right side of the connection seat (2), and the two support rods (3) on the same side are connected via a pin shaft (340).

9. A seat, characterized in that: The invention comprises a backrest (4), a seat (5) and a telescopic support device according to any one of claims 1 to 8, wherein a mounting groove (410) is provided on the front end surface of the backrest (4), the connecting seat (2) is installed in the mounting groove (410), and the carrier (1) can move forward and backward relative to the backrest (4) to support the user's waist.

10. The seat according to claim 9, characterized in that A second connecting groove (240) is provided on the connecting seat (2) in a vertical direction, and a clamping block (220) is slidably connected in the second connecting groove (240); the backrest (4) is provided with a pull-wire mechanism, and the pull-wire mechanism comprises a pull-wire (420) and an adjustment switch (421); the adjustment switch (421) is arranged on one of the left and right sides of the backrest (4); one end of the pull-wire (420) passes through the connecting seat (2) and is connected to the clamping block (220), and the other end is connected to the adjustment switch (421); the adjustment switch (421) is configured to tighten or loosen the pull-wire (420), thereby adjusting the clamping block (220) to slide upward or downward.

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