Seat extending part

Abstract

The utility model provides a seat extension part which comprises a pair of extension rods, a fixed seat, a connecting rod and a supporting plate, the extension rods and the fixed seat can be connected in a manner of extending out or retracting relative to the fixed seat, the connecting rod is fixed at the extension ends of the two extension rods, the supporting plate is provided with a connector, and the connector is connected with the connecting rod through the connecting rod. The connector is connected with the connecting rod in an assembled mode, a gear component, a wedge-shaped space, an elastic component and a wedge-shaped tooth block are arranged in the connector, a gear tooth section is arranged on the gear component, gear pushing heads are arranged at the two ends of the gear tooth section, the gear component is fixed to the connecting rod, and the wedge-shaped space is arranged in the wedge-shaped space. The wedge-shaped tooth block and the elastic component are arranged in the wedge-shaped space, the wedge-shaped tooth block is located on the meshing side of the gear tooth section of the gear component, and the wedge-shaped space moves along with the supporting plate. The fixing seat can be generally used for being fixed at the bottom of a seat, when the fixing seat is used, the supporting plate can be pulled out from the lower portion of the seat, the extending rod extends out, the supporting plate can be unfolded, and the fixing angle of the supporting plate can be adjusted.

Description

Technical Field

[0001] The utility model relates to the field of seat accessories, in particular to a seat extension part. Background Art

[0002] At present, with the in-depth research on ergonomics, seat design begins to focus on the support of various parts of the human body. As an important part to improve comfort and support, the leg rest has also gradually developed. Modern seats, especially office chairs, are not only height-adjustable, but also equipped with leg rests (armrests) whose width and angle can be adjusted to ensure effective support for the arms and legs. Such development makes the seat more in line with the requirements of ergonomics and improves the comfort and health of sitting. The utility model aims to design a new type of seat extension part for seat leg rests. Summary of the Utility Model

[0003] In view of the technical background of the above-mentioned prior art, the purpose of the utility model is to provide a new type of seat extension part for seat leg rests.

[0004] To achieve the above technical purposes, the utility model adopts the following technical solutions:

[0005] The utility model provides a seat extension part, including a pair of extension rods, a fixed seat, a connecting rod and a support plate. The extension rods are connected to the fixed seat so as to be extendable or retractable relative to the fixed seat. The connecting rod is fixed to the extending ends of the two extension rods. The support plate is provided with a connecting head, and the connecting head is assembled and connected with the connecting rod. A gear member, a wedge-shaped space, an elastic member and a wedge-shaped tooth block are arranged in the connecting head. Tooth segments are provided on the gear member, and push blocks are arranged at both ends of the tooth segments. The gear member is fixed to the connecting rod. The wedge-shaped tooth block and the elastic member are arranged in the wedge-shaped space. The wedge-shaped tooth block is located on the meshing side of the tooth segment of the gear member, and the wedge-shaped space moves with the support plate.

[0006] Further, in the seat extension part, the narrow part of the wedge-shaped space is arranged towards the unfolding direction of the support plate, and the wide part of the wedge-shaped space is arranged towards the retracting direction of the support plate.

[0007] Further, in the seat extension part, a rotating plate is further arranged in the connecting head. The wedge-shaped space is located on the rotating plate. The rotating plate is relatively fixed to the connecting head and rotates with the rotation of the support plate.

[0008] Further, in the seat extension part, the connecting head is further provided with a pair of fixing plates. The gear member, the wedge-shaped tooth block and the wedge-shaped space are clamped and fixed between the two fixing plates. Through holes are arranged on the fixing plates, and the connecting rod passes through the through holes.

[0009] Furthermore, for the seat extension component, the part of the wedge-shaped space of the rotating plate is fixed to the fixed plate. The wedge-shaped space is arranged on one side of the rotating plate, and another part of the rotating plate extends out of the fixed plate and forms an angle with the fixed plate.

[0010] Furthermore, for the seat extension component, the component formed by the fixed connection between the fixed plate and the rotating plate is in an "L" shape.

[0011] Furthermore, for the seat extension component, a resilient member for the rebound of the support plate is further arranged inside the connecting head.

[0012] Furthermore, for the seat extension component, the resilient member is a torsion spring. The resilient member is installed on the connecting rod, and the inner end of the resilient member is connected to the connecting rod, and the outer end of the resilient member is connected to the fixed plate.

[0013] Furthermore, for the seat extension component, the connecting rod is a polygonal prism rod. The connecting rod passes through the extending ends of the two extending rods and is connected to the connecting head. A head shaft is arranged at the connecting end of the connecting rod and the connecting head. The head shaft has a transition part with rounded edges, and the head shaft and the other part of the connecting rod form a stepped shaft. A polygonal hole matching the head shaft is arranged in the middle of the gear component, and the gear component is installed on the head shaft through the polygonal hole. A supporting post is arranged on the fixed plate, and the supporting post is located on one side of the resilient member. The outer end of the resilient member is connected to the supporting post, and a cutting groove is arranged at the end of the head shaft, and the inner end of the resilient member is assembled in the cutting groove.

[0014] Furthermore, for the seat extension component, the connecting rod is a round rod. The connecting rod passes through the extending ends of the two extending rods and is connected to the connecting head. Cutting grooves and key grooves are arranged at both ends of the connecting rod. A circular hole is arranged in the middle of the gear component, and a key position matching the key groove is arranged on one side of the circular hole. The inner end of the resilient member is assembled in the cutting groove. A supporting post is arranged on the fixed plate, and the supporting post is located on one side of the resilient member. The outer end of the resilient member is connected to the supporting post.

[0015] Furthermore, for the seat extension component, the extending end of the extending rod and the connecting rod are fixedly connected by screws. Threaded holes are arranged on the connecting rod, and connecting holes are arranged at the extending ends of the extending rods. The screws pass through the connecting holes and are threadedly connected to the threaded holes to fixedly connect the extending ends of the extending rods and the connecting rod; alternatively, threaded holes are arranged at the extending ends of the extending rods, and connecting holes are arranged on the connecting rod. The screws pass through the connecting holes and are threadedly connected to the threaded holes to fixedly connect the extending ends of the extending rods and the connecting rod.

[0016] Further, for the seat extending member, there are two connecting heads, symmetrically arranged on both sides of the support plate. Gear members, wedge-shaped spaces, elastic members and wedge-shaped tooth blocks are arranged in both connecting heads. A pair of parallel sleeves are fixed under the fixed seat, and two extending rods are respectively installed in the two sleeves. The inner end of the extending rod is provided with a flat head knurled screw, and the diameter of the screw head of the flat head knurled screw is not less than the diameter of the extending rod. A sleeve is arranged between the connecting head and the extending end of the extending rod, and the sleeve is sleeved on the connecting rod.

[0017] Compared with the prior art, the present invention provides a seat extending member, including a pair of extending rods, a fixed seat, a connecting rod and a support plate. The extending rod is connected to the fixed seat so as to be able to extend or retract relative to the fixed seat. The connecting rod is fixed to the extending ends of the two extending rods. The support plate is provided with a connecting head, and the connecting head is assembled and connected to the connecting rod. A gear member, a wedge-shaped space, an elastic member and a wedge-shaped tooth block are arranged in the connecting head. The gear member has tooth segments, and push blocks are arranged at both ends of the tooth segments. The gear member is fixed to the connecting rod. The wedge-shaped tooth block and the elastic member are installed in the wedge-shaped space. The wedge-shaped tooth block is located on the meshing side of the tooth segment of the gear member, and the wedge-shaped space moves with the support plate. The structure of the present invention is simple. The fixed seat is generally used to be fixed at the bottom of the seat. When in use, the support plate can be pulled out from the seat, the extending rod extends, the support plate can be unfolded, and the fixed angle of the support plate can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the first preferred embodiment of the seat extending member provided by the present invention.

[0020] Figure 2 It is a schematic exploded view of the first preferred embodiment of the seat extending member provided by the present invention. Figure 1 。

[0021] Figure 3 It is a schematic exploded view of the first preferred embodiment of the seat extending member provided by the present invention. Figure 2 。

[0022] Figure 4Exploded structure schematic diagram of the first preferred embodiment of the seat extension component provided by the present utility model Figure 2 Partial enlarged view.

[0023] Figure 5 Exploded structure schematic diagram of the second preferred embodiment of the seat extension component provided by the present utility model.

[0024] Figure 6 Partial enlarged view of the exploded structure schematic diagram of the second preferred embodiment of the seat extension component provided by the present utility model.

[0025] Figure 7 Structure schematic diagram of the gear member of the second preferred embodiment of the seat extension component provided by the present utility model.

[0026] Explanation of reference numerals in the drawings:

[0027] Extension rod 11

[0028] Fixed seat 12

[0029] Sleeve 13

[0030] Connecting rod 14

[0031] Support plate 15

[0032] Connector 16

[0033] Gear member 17

[0034] Tooth segment 171

[0035] Wedge-shaped space 18

[0036] Wedge-shaped tooth block 19

[0037] Rotating plate 20

[0038] Fixed plate 21

[0039] Through hole 22

[0040] Rebound member 23

[0041] Flat head knurled screw 24

[0042] Sleeve 25

[0043] Head shaft 26

[0044] Polygonal hole 27

[0045] Latching post 28

[0046] Cutting groove 29

[0047] Transition part 30

[0048] Key groove 31

[0049] Circular hole 32

[0050] Key position 33 Specific implementation manner

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0052] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0053] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0054] Such as Figures 1 - 4As shown, in the first preferred embodiment of the present utility model, the present utility model provides a seat extending member including a pair of extending rods 11, a fixed seat 12, a connecting rod 14, and a support plate 15. The extending rod 11 is connected to the fixed seat 12 so as to be extendable or retractable relative to the fixed seat 12. The connecting rod 14 is fixed to the extending ends of the two extending rods 11. The support plate 15 is provided with a connecting head 16, and the connecting head 16 is assembled and connected to the connecting rod 14. A gear member 17, a wedge-shaped space 18, an elastic member (not shown in the figure), and a wedge-shaped tooth block 19 are provided in the connecting head 16. The elastic member abuts against the side of the wedge-shaped tooth block 19. The gear member 17 has tooth segments 171, and push blocks are provided at both ends of the tooth segment 171. The gear member 17 is fixed to the connecting rod 14. The wedge-shaped tooth block 19 and the elastic member are installed in the wedge-shaped space 18. The wedge-shaped tooth block 19 is located on the meshing side of the tooth segment 171 of the gear member 17. The wedge-shaped space 18 moves with the support plate 15. In the present utility model, the gear member 17 is fixed, and the rotation of the support plate 15 drives the wedge-shaped space 18 to rotate around the gear member 17. The connecting rod 14 can be a metal connecting rod.

[0055] Furthermore, in the seat extension component provided by the present invention, the narrow portion of the wedge-shaped space 18 is arranged in the direction of deployment of the support plate 15, and the wide portion of the wedge-shaped space 18 is arranged in the direction of retraction of the support plate 15. In this embodiment, in most cases, the narrow portion of the wedge-shaped space 18 is located at the upper portion, while the wide portion of the wedge-shaped space 18 is located at the lower portion. When the deployed support plate 15 is subjected to a downward force from top to bottom, the wedge-shaped space 18 rotates around the gear member 17 toward the wide portion of the wedge-shaped space 18, and the wedge-shaped tooth block 19 meshing with the gear member 17 has a tendency to move toward the narrow portion of the wedge-shaped space 18. Due to structural extrusion restrictions, the engagement between the wedge-shaped tooth block 19 and the gear member 17 becomes increasingly tight, and the gear member 17 cannot continue to rotate, and the angle is locked at this time. When the support plate 15 is unfolded from bottom to top, the wedge-shaped space 18 rotates around the gear member 17 toward the narrow portion of the wedge-shaped space 18, and the wedge-shaped tooth block 19 moves along the wide portion of the wedge-shaped space 18. Under the action of the elastic member, the wedge-shaped tooth block 19 and the gear tooth segment 171 of the gear member 17 are in contact but not meshed (or not fully meshed). At this time, the wedge-shaped tooth block 19 can no longer limit the rotation of the gear member 17, and the angle is in an adjustable state. When the gear member 17 reverses again, the wedge-shaped tooth block 19 is pushed into the narrow portion of the wedge-shaped space 18 again, meshing tightly with the gear member 17. The wedge-shaped tooth block 19 cannot continue to move, and the wedge-shaped space 18 and the gear member 17 are locked. In this way, one-way angle adjustment and reverse locking are achieved. Since the angle adjustment principle composed of the gear member 17, wedge-shaped tooth block 19, wedge-shaped space 18, and elastic member structure is already known, the present invention will not elaborate on the corresponding structure. When the support plate 15 is unfolded and rotated upward to a certain angle, the upper push-block head will push the wedge-shaped tooth block 19 to overcome the elastic force of the elastic component, so that the wedge-shaped tooth block 19 is completely separated from the gear component 17, and the rotation direction is no longer restricted. When the support plate 15 is retracted downward until the lower push-block head begins to contact the wedge-shaped tooth block 19 and moves the wedge-shaped tooth block 19 toward the narrow part of the wedge-shaped space 18, the elastic component begins to recover, and then the wedge-shaped tooth block 19 continues to move until it is locked.

[0056] Further, for the seat extending component provided by the present utility model, a rotating plate 20 is further installed inside the connecting head 16. The wedge-shaped space 18 is located on the rotating plate 20. The rotating plate 20 is relatively fixed to the connecting head 16, and the rotating plate 20 rotates with the rotation of the support plate 15. Further, for the seat extending component provided by the present utility model, the connecting head 16 is further provided with a pair of fixing plates 21. The gear member 17, the wedge-shaped tooth block 19, and the wedge-shaped space 18 are clamped and fixed between the two fixing plates 21. Through holes 22 are provided on the fixing plates 21, and the connecting rod 14 passes through the through holes 22. Further, in this embodiment, there are two holes (not labeled in the figure) on the wedge-shaped tooth block 19 for installing limit posts (not shown in the figure). Corresponding arc-shaped grooves are provided on the fixing plates 21, and the ends of the limit posts are located in the arc-shaped grooves to limit the movement range of the wedge-shaped tooth block 19 in the wedge-shaped space 18. The tooth segment 171 of the gear member 17 in this embodiment is located at the upper front part of the gear member 17. Further, for the seat extending component provided by the present utility model, the part of the rotating plate 20 where the wedge-shaped space 18 is located is fixed to the fixing plate 21. The wedge-shaped space 18 is provided on one side of the rotating plate 20, and the other part of the rotating plate 20 extends outside the fixing plate 21 and forms an angle with the fixing plate 21. Further, for the seat extending component provided by the present utility model, the component formed by the fixed connection between the fixing plate 21 and the rotating plate 20 is in an "L" shape. That is to say, the rotating plate 20 is perpendicular to the fixing plate 21, and the included angle is 90°. This can increase the force-bearing surface between the connecting head 16, the fixing plate 21, and the rotating plate 20, thereby reducing the structural strength requirements of the connecting head 16 and being beneficial to ensuring the service life of the parts.

[0057] Further, for the seat extending component provided by the present utility model, a rebounding member 23 for the rebound of the support plate 15 is further provided inside the connecting head 16. Further, for the seat extending component provided by the present utility model, the rebounding member 23 is a torsion spring. The rebounding member 23 is installed on the connecting rod 14, and the inner end of the rebounding member 23 is connected to the connecting rod 14, and the outer end of the rebounding member 23 is connected to the fixing plate 21. The rebounding member 23 can be used for the automatic retraction of the support plate 15 during retraction, facilitating user operation.

[0058] Specifically, for the seat extension component provided by the present utility model, in this embodiment, there are two connecting heads 16, symmetrically arranged on both sides of the support plate 15. Gear components 17, wedge-shaped spaces 18, elastic components, and wedge-shaped tooth blocks 19 are provided inside both connecting heads 16. A pair of parallel sleeves 13 are fixed below the fixed seat 12, and two extension rods 11 are respectively installed in the two sleeves 13. A flat knurled screw 24 is installed at the inner end of the extension rod 11, and the diameter of the screw head of the flat knurled screw 24 is not less than the diameter of the extension rod 11. A sleeve 25 is arranged between the connecting head 16 and the extending end of the extension rod 11, and the sleeve 25 is sleeved on the connecting rod 14. Further, for the seat extension component provided by the present utility model, the connecting rod 14 is a polygonal prism rod. The connecting rod 14 passes through the extending ends of the two extension rods 11 and is connected to the connecting head 16. A head shaft 26 is provided at the connecting end of the connecting rod 14 connected to the connecting head 16. The head shaft 26 has a transition portion 30 with rounded edges. The head shaft 26 and the other part of the connecting rod 14 form a stepped shaft. A polygonal hole 27 matching the head shaft 26 is provided in the middle of the gear component 17, and the gear component 17 is installed on the head shaft 26 through the polygonal hole 27. A latching post 28 is provided on the fixing plate 21, and the latching post 28 is located on one side of the resilient member 23. The outer end of the resilient member 23 is connected to the latching post 28, and a cutting groove 29 is provided at the end of the head shaft 26. The inner end of the resilient member 23 is assembled in the cutting groove 29. The connecting rod 14 with such a structure is convenient for production and manufacturing. In this embodiment, the connecting rod 14 is a hexagonal prism rod, and the extending ends of the extension rods 11 have corresponding hexagonal holes. The assembly of the present utility model is very convenient. First, insert the two extension rods 11 into the sleeves 13 on both sides of the fixed seat 12 respectively, and then screw on the flat knurled screw 24 to seal the inner ends of the extension rods 11. Due to the symmetric structure design of both ends of the connecting rod 14, the connecting rod 14 can be inserted from one side of one extension rod 11 and passed out from the outside of the other extension rod 11. Then, sleeves 25 are sleeved on both ends of the connecting rod 14, the internal components of the connecting head 16 are installed, and finally the connecting head 16 is sleeved on to complete the assembly of the support plate 15 and the connecting rod 14, thus completing the assembly of the entire product.

[0059] The form of the connecting rod is diverse. In order to further reduce production costs, the present utility model also provides a second preferred embodiment.

[0060] Such as Figures 5 - 7As shown, in the second preferred embodiment of the present utility model, the present utility model provides a seat extension member including a pair of extension rods 11, a fixed seat 12, a connecting rod 14 and a support plate 15. The extension rod 11 is connected to the fixed seat 12 so as to be extendable or retractable relative to the fixed seat 12. The connecting rod 14 is fixed to the extended ends of the two extension rods 11. The support plate 15 is provided with a connecting head 16, and the connecting head 16 is assembled and connected to the connecting rod 14. A gear member 17, a wedge-shaped space 18, an elastic member (not shown in the figure) and a wedge-shaped tooth block 19 are provided in the connecting head 16. The elastic member abuts against the side of the wedge-shaped tooth block 19. Tooth segments 171 are provided on the gear member 17, and push stops are provided at both ends of the tooth segment 171. The gear member 17 is fixed to the connecting rod 14. The wedge-shaped tooth block 19 and the elastic member are installed in the wedge-shaped space 18. The wedge-shaped tooth block 19 is located on the meshing side of the tooth segment 171 of the gear member 17. The wedge-shaped space 18 moves with the support plate 15. In the present utility model, the gear member 17 is fixed, and the rotation of the support plate 15 drives the wedge-shaped space 18 to rotate around the gear member 17.

[0061] Different from the first preferred embodiment, in the second preferred embodiment, the connecting rod is a round rod 14, specifically a tubular round rod. The connecting rod 14 passes through the extended ends of the two extension rods 11 and is connected to the connecting head 16. Cutting grooves 29 and key grooves 31 are provided at both ends of the connecting rod 14. A circular hole 32 is provided in the middle of the gear member 17, and a key position 33 matching the key groove 31 is provided on one side of the circular hole 32. The inner end of the return spring 23 is assembled in the cutting groove 29. A hanging post 28 is provided on the fixing plate 21. The hanging post 28 is located on one side of the return spring 23. The outer end of the return spring 23 is connected to the hanging post 28. A stop head is provided at the inner end of the return spring 23 and is installed inside the connecting rod 14. The outer end of the return spring 23 is hook-shaped and hangs on the hanging post 28. The shape of the connecting rod here is simpler, and the structural processing at both ends is simpler. Only two grooves need to be directly cut out, and the gear member 17 can be directly installed. The cut key grooves can not only limit the rotation of the gear member 17, but also limit the installation position of the gear member 17 on the connecting rod 14. Such a structure will reduce both the material cost and the assembly cost, thereby further reducing the production cost.

[0062] The connecting rod 14 of the round rod and the protruding end of the protruding rod 11 can rotate relative to each other. To limit this rotation, the protruding end of the protruding rod 11 and the connecting rod 14 are fixedly connected by screws. A threaded hole is provided on the connecting rod 14, and a connecting hole is provided on the protruding end of the protruding rod 11. The screw passes through the connecting hole and is threadedly connected to the threaded hole to fixedly connect the protruding end of the protruding rod 11 and the connecting rod 14; alternatively, a threaded hole is provided on the protruding end of the protruding rod, and a connecting hole is provided on the connecting rod. The screw passes through the connecting hole and is threadedly connected to the threaded hole to fixedly connect the protruding end of the protruding rod and the connecting rod. That is to say, during assembly, first insert the connecting rod 14 into the protruding end of the protruding rod 11. After aligning the positions of the threaded hole and the connecting hole, then install and fix the screw to fix the relative positions of the protruding rod 11 and the connecting rod 14, so that the connecting rod 14 cannot move left and right or rotate on its own.

[0063] In summary, the structure of the present utility model is simple. The fixed seat can generally be used to be fixed at the bottom of the seat. During use, the support plate can be pulled out from under the seat, the protruding rod extends out, the support plate can be unfolded, and the fixed angle of the support plate can be adjusted.

[0064] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the description and drawings of the present utility model under the inventive concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A seat extending member, characterized in that, It includes a pair of extending rods, a fixed seat, a connecting rod and a support plate. The extending rods are connected to the fixed seat so as to be extendable or retractable relative to the fixed seat. The connecting rod is fixed to the extending ends of the two extending rods. The support plate is provided with a connecting head, and the connecting head is assembled and connected to the connecting rod. A gear member, a wedge-shaped space, an elastic member and a wedge-shaped tooth block are arranged in the connecting head. The gear member has tooth segments, and push blocks are provided at both ends of the tooth segments. The gear member is fixed to the connecting rod. The wedge-shaped tooth block and the elastic member are installed in the wedge-shaped space. The wedge-shaped tooth block is located on the meshing side of the tooth segment of the gear member, and the wedge-shaped space moves with the support plate.

2. The seat extension member according to claim 1, characterized in that, The narrow part of the wedge-shaped space is arranged towards the unfolding direction of the support plate, and the wide part of the wedge-shaped space is arranged towards the retracting direction of the support plate. A rotating plate is also installed in the connecting head. The wedge-shaped space is located on the rotating plate, and the rotating plate is relatively fixed to the connecting head and rotates with the rotation of the support plate.

3. The seat extension member according to claim 2, wherein The connecting head is also provided with a pair of fixing plates. The gear member, the wedge-shaped tooth block and the wedge-shaped space are clamped and fixed between the two fixing plates. Through holes are provided on the fixing plates, and the connecting rod passes through the through holes.

4. The seat extension member according to claim 3, wherein The part of the rotating plate where the wedge-shaped space is located is fixed to the fixing plate. The wedge-shaped space is arranged on one side of the rotating plate, and the other part of the rotating plate extends out of the fixing plate and forms an angle with the fixing plate.

5. The seat extension member according to claim 3, wherein, A rebounding member for the rebound of the support plate is also arranged in the connecting head.

6. The seat extending member according to claim 5, wherein, The rebounding member is a torsion spring. The rebounding member is installed on the connecting rod, and the inner end of the rebounding member is connected to the connecting rod, and the outer end of the rebounding member is connected to the fixing plate.

7. The seat extension member according to claim 6, wherein The connecting rod is a round rod. The connecting rod passes through the extending ends of the two extending rods and is connected to the connecting head. Cutting grooves and key grooves are provided at both ends of the connecting rod. A circular hole is provided in the middle of the gear member, and a key position matching the key groove is provided on one side of the circular hole. The inner end of the rebounding member is assembled in the cutting groove. A supporting post is provided on the fixing plate, and the supporting post is located on one side of the rebounding member, and the outer end of the rebounding member is connected to the supporting post.

8. The seat extension member according to claim 7, characterized in that, The extending end of the extending rod and the connecting rod are fixedly connected by screws. Threaded holes are provided on the connecting rod, and connecting holes are provided on the extending ends of the extending rods. The screws pass through the connecting holes and are threadedly connected to the threaded holes to fixedly connect the extending ends of the extending rods and the connecting rod; or, threaded holes are provided on the extending ends of the extending rods, and connecting holes are provided on the connecting rod. The screws pass through the connecting holes and are threadedly connected to the threaded holes to fixedly connect the extending ends of the extending rods and the connecting rod.

9. The seat extension member according to claim 6, wherein, The connecting rod is a polygonal prism rod. The connecting rod passes through the extending ends of the two extending rods and is connected to the connecting head. A head shaft is provided at the connecting end where the connecting rod is connected to the connecting head. The head shaft has a transition portion with rounded edges, and the head shaft and the other part of the connecting rod form a stepped shaft. A polygonal hole matching the head shaft is provided in the middle of the gear member, and the gear member is mounted on the head shaft through the polygonal hole. A supporting post is provided on the fixing plate, and the supporting post is located on one side of the elastic member. The outer end of the elastic member is connected to the supporting post. A cutting groove is provided at the end of the head shaft, and the inner end of the elastic member is assembled in the cutting groove.

10. The seat extension member according to any one of claims 1-9, characterized in that, There are two connecting heads, which are symmetrically arranged on both sides of the supporting plate. A gear member, a wedge-shaped space, an elastic member, and a wedge-shaped tooth block are provided in each of the two connecting heads. A pair of parallel sleeves are fixed below the fixed seat, and the two extending rods are respectively mounted in the two sleeves. A flat head knurled screw is installed at the inner end of the extending rod, and the diameter of the screw head of the flat head knurled screw is not less than the diameter of the extending rod. A sleeve is provided between the connecting head and the extending end of the extending rod, and the sleeve is sleeved on the connecting rod.

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