Multi-gear locking device for seat chassis

Abstract

The utility model discloses a multi-gear locking device for a seat chassis, which comprises a base and a bottom plate, the bottom plate is adjustably arranged above the base through a warped plate, the warped plate is hinged with the base, an adjusting rod is arranged on the base in a penetrating manner, a locking block is arranged on the adjusting rod, an unlocking groove and a locking groove are arranged on the base, and the locking block is arranged in the unlocking groove. The adjusting rod drives the locking block to be clamped in the unlocking groove or the locking groove; a gear pin driven by an adjusting rod is movably arranged on the base, a plurality of gear holes are formed in the side wall of the warping plate, and when the adjusting rod drives the locking block to be clamped into the locking groove, the adjusting rod drives the gear pin to be inserted into the gear holes to lock the warping plate. According to the scheme, the gear pin is shifted by the adjusting rod to be inserted into different gear holes in the warping plate to achieve locking between the warping plate and the base, namely, locking between the warping plate and the bottom plate is achieved, operation is convenient and fast, the structure is simple, the operation space is small, parts are all arranged in the base, multi-gear locking can be achieved through the gear holes, the locking structure is firm, and the locking effect is good. And the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of seat chassis, in particular to a multi-position locking device for a seat chassis. Background Art

[0002] The backrest of commercially available chairs is typically fixed to the chassis, and a handle adjusts the compression force of the chassis spring, thereby adjusting the seat height and backrest tilt. Current seat chassis designs, designed to achieve reclining, are often complex, with numerous components and requiring threaded connections for locking. This can easily lead to damage or loosening, causing malfunctions.

[0003] For example, Chinese patent publication number CN115919097A, publication date April 7, 2023, is named "A seat chassis", which includes a backrest fixing frame, a base, a movable plate, a main spring and an adjustment handle. The backrest fixing frame fixes the backrest, and the main spring is arranged under the base. The main spring controls the tilting force of the backrest fixing frame and prompts the backrest to return to its original position. It also includes a hinged frame, the upper end of the hinged frame abuts against the bottom surface of the movable plate, the hinged frame moves downward relative to the base, and drives the movable plate to flip a certain angle relative to the base, while compressing the main spring. When the backrest is installed on the backrest fixing frame, the backrest can follow the movement of the person's back through the left and right swing and up and down swing of the person's back, tightly sticking to the person's back, providing support for various sitting postures, and improving the comfort of the chair.

[0004] The disadvantages of the existing patents are that the existing seat chassis are mostly locked by threaded connections, which have complex structures, and the threaded connections are easily damaged or loosened, causing malfunctions. Utility Model Content

[0005] The purpose of the utility model is to solve the problems that the existing seat chassis mostly adopts threaded connection for locking, which has a complex structure and the threaded connection is easily damaged and loosened, and to provide a multi-speed locking device for the seat chassis with a simple structure and not easy to be damaged.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A multi-position locking device for a seat chassis comprises a base and a bottom plate. The bottom plate is arranged above the base via a rocker adjustment mechanism. The rocker is hinged to the base. An adjustment rod is provided on the base, a locking block is provided on the adjustment rod, and an unlocking slot and a locking slot are provided on the base. The adjustment rod drives the locking block to be engaged in the unlocking slot or the locking slot. A shift pin driven by the adjustment rod is provided on the base. The rocker sidewall is provided with a plurality of shift holes. When the adjustment rod drives the locking block to engage in the locking slot, it simultaneously drives the shift pin to insert into the shift hole to lock the rocker. In this technical solution, by moving the adjustment rod, the locking block on the adjustment rod is driven to engage in the unlocking slot or the locking slot of the base, thereby enabling the shift pin to extend or extend into the shift hole to unlock or lock the rocker. This technical solution adjusts the height of the seat chassis and the angle of the backrest by only moving the adjustment rod. It has a simple structure, is not easy to damage, and is easy to operate.

[0008] In the prior art, the bottom plate of the seat chassis is arranged above the base. One end of the bottom plate is hinged to the base via a seesaw, and the other end is hinged to the base via a connecting plate. The bottom plate, connecting plate, base, and seesaw are hinged end to end in sequence to form a hinged four-bar mechanism. The seat is arranged on the bottom plate, and the backrest is arranged on the seesaw. The seesaw and bottom plate interact to adjust the seat chassis height and backrest angle. In the prior art, a threaded connection using a screw and nut is often used for locking, so that the seesaw is fixed in the corresponding required gear position. The threaded connection is easily damaged and easy to loosen, and the operation is cumbersome and the operating space is limited. In this technical solution, the seesaw and the base are locked by inserting the gear pin into the different gear holes on the seesaw through the adjustment rod, that is, the seesaw and the bottom plate are locked. The operation is convenient, the structure is simple, and the operating space is small. All parts are arranged in the base, and a number of gear holes can achieve multi-gear locking. The locking structure is firm, which extends the service life of the product.

[0009] When this technical solution is implemented, it also includes a spring assembly, one end of which is connected to the connecting plate and the other end is connected to the base, thereby improving the comfort of the seat.

[0010] Preferably, the base is provided with a bracket, the shift pin is movably arranged on the bracket, one end of the shift pin is connected to the adjustment rod, and the other end is engaged with the shift hole of the rocker. The bracket is used to support the shift pin and play a supporting and guiding role.

[0011] Preferably, the shift pin is connected to the adjustment rod via a torsion spring, and the adjustment rod uses the torsion spring to move the shift pin. Using a torsion spring to move the shift pin, combined with a bracket to support the shift pin, improves the flexibility of the shift pin and increases the elastic space of the connection between the shift pin and the adjustment rod. A fixed connection between the shift pin and the adjustment rod can cause damage to the connection, while using a torsion spring increases the flexibility of the shift pin, prevents the shift pin from getting stuck, and improves the connection performance between the shift pin and the adjustment rod.

[0012] Preferably, a limiting sleeve is provided on the shift pin, and the limiting sleeve is limited in the bracket. The shift pin is limited on the bracket by the limiting sleeve.

[0013] Preferably, the inner end of the adjusting rod is inserted into the base and is inserted into the bracket, and the bracket supports the inner end of the adjusting rod. The bracket plays a role in supporting and guiding the adjusting rod, so that the adjusting rod moves smoothly.

[0014] Preferably, the base is provided with an elastic block, the unlocking slot and the locking slot are located on the elastic block, and an elastic protrusion is formed between the unlocking slot and the locking slot. When the adjusting rod is moved to move the shift block between the unlocking slot and the locking slot on the elastic block, the elastic protrusion acts as a limiter. In the absence of external force, the elastic protrusion limits the shift block within the locking slot.

[0015] Preferably, the unlocking groove and the locking groove are distributed along the moving direction of the adjusting rod, so that the movement and locking of the adjusting rod are smoother.

[0016] Preferably, the unlocking groove extends perpendicular to the moving direction of the adjusting rod, the locking groove extends perpendicular to the moving direction of the adjusting rod, and the lower end of the locking block is provided with a toggle portion extending perpendicular to the moving direction of the adjusting rod. This increases the locking area and locking performance of the shift block and improves the operational stability of the adjusting rod.

[0017] Preferably, the plurality of gear holes are distributed in a circular pattern according to the central axis of the hinge point between the rocker and the base.

[0018] Preferably, the central axis of the adjusting rod is arranged in parallel with the central axis of the shift pin, and the central axis of the hinge point between the rocker and the base is arranged in parallel with the central axis of the adjusting rod.

[0019] Therefore, the utility model has the following beneficial effects: the gear pin is moved by the adjusting rod and inserted into different gear holes on the rocker to achieve locking between the rocker and the base, that is, locking between the rocker and the base plate is achieved. It is easy to operate, has a simple structure, and a small operating space. All parts are arranged in the base, and several gear holes can achieve multi-gear locking. The locking structure is firm, which extends the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a structural schematic diagram including a base plate, a connecting plate and a spring assembly.

[0021] Figure 2 It is a structural schematic diagram of the present utility model.

[0022] Figure 3 It is another structural schematic diagram of the utility model.

[0023] As shown in the picture:

[0024] Base 1, bracket 1.1,

[0025] Base plate 2,

[0026] Rocker 3, gear hole 3.1,

[0027] Connecting plate 4, spring assembly 5, adjusting rod 6, locking block 7,

[0028] Elastic block 8, unlocking groove 8.1, locking groove 8.2,

[0029] Shift pin 9, torsion spring 10, and limit member 11. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the technical solution of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1, as Figure 1 、 Figure 2 、 Figure 3 The seat bottom plate 2 shown in the figure uses a multi-shift locking device, including a base 1 and a base plate 2. The base plate 2 is adjusted and arranged above the base 1 through a rocker 3. The rocker 3 is hinged to the base 1. An adjusting rod 6 is passed through the base 1, and a locking block 7 is provided on the adjusting rod 6. An unlocking groove 8.1 and a locking groove 8.2 are provided on the base 1. The adjusting rod 6 drives the locking block 7 to be clamped in the unlocking groove 8.1 or the locking groove 8.2; a shift pin 9 driven by the adjusting rod 6 is movably provided on the base 1, and a plurality of shift holes 3.1 are provided on the side wall of the rocker 3. When the adjusting rod 6 drives the locking block 7 to be clamped in the locking groove 8.2, it simultaneously drives the shift pin 9 to be inserted into the shift hole 3.1 to lock the rocker 3.

[0032] The backrest of commercially available chairs is typically fixed to the chassis, and a handle adjusts the compression force of the chassis spring, thereby adjusting the seat height and backrest tilt. Current seat chassis designs, designed to achieve reclining, are often complex, with numerous components and requiring threaded connections for locking. This can easily lead to damage or loosening, causing malfunctions.

[0033] In order to solve the problems that the existing seat chassis mostly use threaded connections for locking, which have complex structures and the threaded connections are easily damaged and loose, a multi-speed locking device for a seat chassis with a simple structure and not easy to be damaged is provided.

[0034] In the above embodiment, by moving the adjustment lever 6, the locking block 7 on the adjustment lever 6 engages in the unlocking slot 8.1 or the locking slot 8.2 of the base 1, thereby extending or retracting the shift pin 9 into the shift hole 3.1 to unlock or lock the rocker 3. This technical solution adjusts the seat chassis height and backrest angle solely by moving the adjustment lever 6, resulting in a simple, damage-resistant structure and convenient operation.

[0035] In the prior art, the seat chassis' bottom plate 2 is positioned above the base 1. One end of the bottom plate 2 is hinged to the base 1 via a rocker plate 3, and the other end is hinged to the base 1 via a connecting plate 4. The bottom plate 2, connecting plate 4, base 1, and rocker plate 3 are hinged end-to-end to form a hinged four-bar mechanism. The seat is mounted on the bottom plate 2, and the backrest is mounted on the rocker plate 3. The rocker plate 3 and bottom plate 2 interact to adjust the seat chassis height and backrest angle. In the prior art, a threaded connection using a screw and nut is often used to lock the rocker plate 3 in the desired position. However, threaded connections are prone to damage and loosening, are cumbersome to operate, and restrict operating space. In this solution, the rocker plate 3 and base 1 are locked together by adjusting the shift pin 9 by moving the adjustment lever 6 into the various shift holes 3.1 on the rocker plate 3. This locks the rocker plate 3 and base 1, thereby locking the rocker plate 3 and base 2. This solution is convenient to operate, has a simple structure, and requires minimal operating space. All components are located within the base 1, and the multiple shift holes 3.1 enable multiple locking positions. The locking structure is robust and extends the product's service life.

[0036] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 As shown, it also includes a spring assembly 5, one end of the spring assembly 5 is connected to the connecting plate 4, and the other end is connected to the base 1, thereby improving the comfort of the seat.

[0037] Example 2, as Figure 1 、 Figure 2 、 Figure 3 The multi-shift locking device for a seat chassis shown in the figure includes a base 1 and a bottom plate 2. The bottom plate 2 is adjusted and arranged above the base 1 through a rocker 3. The rocker 3 is hinged to the base 1. An adjusting rod 6 is passed through the base 1. A locking block 7 is provided on the adjusting rod 6. An unlocking groove 8.1 and a locking groove 8.2 are provided on the base 1. The adjusting rod 6 drives the locking block 7 to be clamped in the unlocking groove 8.1 or the locking groove 8.2. A shift pin 9 driven by the adjusting rod 6 is movably provided on the base 1. A plurality of shift holes 3.1 are provided on the side wall of the rocker 3. When the adjusting rod 6 drives the locking block 7 to be clamped in the locking groove 8.2, it simultaneously drives the shift pin 9 to be inserted into the shift hole 3.1 to lock the rocker 3.

[0038] In this embodiment, Figure 1 、 Figure 2 、 Figure 3As shown, the base 1 is provided with an elastic block 8, with an unlocking slot 8.1 and a locking slot 8.2 located on the elastic block 8, and an elastic protrusion formed between the unlocking slot 8.1 and the locking slot 8.2. The adjustment lever 6 is moved to slide the shift block between the unlocking slot 8.1 and the locking slot 8.2 on the elastic block 8, and the elastic protrusion acts as a limiter. In the absence of external force, the elastic protrusion holds the shift block in the locking slot 8.2.

[0039] Further, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the unlocking slot 8.1 and locking slot 8.2 are distributed along the movement direction of the adjusting rod 6. This makes the movement and locking of the adjusting rod 6 smoother. The unlocking slot 8.1 extends perpendicular to the movement direction of the adjusting rod 6, while the locking slot 8.2 extends perpendicular to the movement direction of the adjusting rod 6. The lower end of the locking block 7 is provided with a toggle portion extending perpendicular to the movement direction of the adjusting rod 6. This increases the locking area and locking performance of the shift block, improving the operational stability of the adjusting rod 6.

[0040] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 As shown, a plurality of gear holes 3.1 are distributed in a circle according to the central axis of the hinge point between the rocker 3 and the base 1.

[0041] Further, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the central axis of the adjusting rod 6 is arranged parallel to the central axis of the shift pin 9 , and the central axis of the hinge point between the rocker 3 and the base 1 is arranged parallel to the central axis of the adjusting rod 6 .

[0042] Further, such as Figure 1 、 Figure 2 、 Figure 3 As shown, a limiter 11 is further provided on the adjusting rod 6. The rocker 3 and the bottom plate 2 are hinged via a rotating shaft. One end of the limiter 11 is limited in the rotating shaft, and the other end abuts against the elastic member. The limiter 11 is put back into the adjusting rod 6 for rotation.

[0043] In the prior art, the seat chassis' bottom plate 2 is positioned above the base 1. One end of the bottom plate 2 is hinged to the base 1 via a rocker plate 3, and the other end is hinged to the base 1 via a connecting plate 4. The bottom plate 2, connecting plate 4, base 1, and rocker plate 3 are hinged end-to-end to form a hinged four-bar mechanism. The seat is mounted on the bottom plate 2, and the backrest is mounted on the rocker plate 3. The rocker plate 3 and bottom plate 2 interact to adjust the seat chassis height and backrest angle. In the prior art, a threaded connection using a screw and nut is often used to lock the rocker plate 3 in the desired position. However, threaded connections are prone to damage and loosening, are cumbersome to operate, and restrict operating space. In this solution, the rocker plate 3 and base 1 are locked together by adjusting the shift pin 9 by moving the adjustment lever 6 into the various shift holes 3.1 on the rocker plate 3. This locks the rocker plate 3 and base 1, thereby locking the rocker plate 3 and base 2. This solution is convenient to operate, has a simple structure, and requires minimal operating space. All components are located within the base 1, and the multiple shift holes 3.1 enable multiple locking positions. The locking structure is robust and extends the product's service life.

[0044] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 As shown, it also includes a spring assembly 5, one end of the spring assembly 5 is connected to the connecting plate 4, and the other end is connected to the base 1, thereby improving the comfort of the seat.

[0045] In summary, this embodiment realizes locking between the rocker 3 and the base 1 by moving the gear pin 9 into different gear holes 3.1 on the rocker 3 through the adjustment rod 6, that is, locking between the rocker 3 and the base 2. It is convenient to operate, has a simple structure, and a small operating space. All parts are arranged in the base 1. Several gear holes 3.1 can realize multi-gear locking. The locking structure is firm, which extends the service life of the product.

[0046] The basic structure is further optimized based on the first embodiment. Figure 1 、 Figure 2 、 Figure 3 The multi-shift locking device for a seat chassis shown in the figure includes a base 1 and a bottom plate 2. The bottom plate 2 is adjusted and arranged above the base 1 through a rocker 3. The rocker 3 is hinged to the base 1. An adjusting rod 6 is passed through the base 1. A locking block 7 is provided on the adjusting rod 6. An unlocking groove 8.1 and a locking groove 8.2 are provided on the base 1. The adjusting rod 6 drives the locking block 7 to be clamped in the unlocking groove 8.1 or the locking groove 8.2. A shift pin 9 driven by the adjusting rod 6 is movably provided on the base 1. A plurality of shift holes 3.1 are provided on the side wall of the rocker 3. When the adjusting rod 6 drives the locking block 7 to be clamped in the locking groove 8.2, it simultaneously drives the shift pin 9 to be inserted into the shift hole 3.1 to lock the rocker 3.

[0047] In this embodiment, Figure 1 、 Figure 2 、 Figure 3As shown, a bracket 1.1 is provided on the base 1, and a shift pin 9 is movably provided on the bracket 1.1. One end of the shift pin 9 is connected to the adjustment rod 6, and the other end is engaged with the shift hole 3.1 of the rocker 3. The bracket 1.1 is used to support the shift pin 9 and play a supporting and guiding role.

[0048] Further, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the shift pin 9 is connected to the adjustment rod 6 via a torsion spring 10, and the adjustment rod 6 moves the shift pin 9 via the torsion spring 10. The use of the torsion spring 10 to move the shift pin 9 and to support the shift pin 9 in conjunction with the bracket 1.1 improves the flexibility of the shift pin 9 and increases the elastic space of the connection between the shift pin 9 and the adjustment rod 6. A fixed connection between the shift pin 9 and the adjustment rod 6 may cause damage to the connection. The use of the torsion spring 10 improves the flexibility of the shift pin 9, prevents the shift pin 9 from getting stuck, and improves the connection performance between the shift pin 9 and the adjustment rod 6.

[0049] Further optimize the gear pin 9, such as Figure 1 、 Figure 2 、 Figure 3 As shown, a limiting sleeve is provided on the gear pin 9, and the limiting sleeve is limited in the bracket 1.1. The gear pin 9 is limited on the bracket 1.1 by the limiting sleeve.

[0050] Further optimize the adjustment rod 6, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the inner end of the adjusting rod 6 is inserted into the base 1 and is inserted into the bracket 1.1, which supports the inner end of the adjusting rod 6. The bracket 1.1 supports and guides the adjusting rod 6 so that the adjusting rod 6 moves smoothly.

[0051] Further, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the base 1 is provided with an elastic block 8, with an unlocking slot 8.1 and a locking slot 8.2 located on the elastic block 8, and an elastic protrusion formed between the unlocking slot 8.1 and the locking slot 8.2. The adjustment lever 6 is moved to slide the shift block between the unlocking slot 8.1 and the locking slot 8.2 on the elastic block 8, and the elastic protrusion acts as a limiter. In the absence of external force, the elastic protrusion holds the shift block in the locking slot 8.2.

[0052] Further, such as Figure 1 、 Figure 2 、 Figure 3As shown, the unlocking slot 8.1 and locking slot 8.2 are distributed along the movement direction of the adjusting rod 6. This makes the movement and locking of the adjusting rod 6 smoother. The unlocking slot 8.1 extends perpendicular to the movement direction of the adjusting rod 6, while the locking slot 8.2 extends perpendicular to the movement direction of the adjusting rod 6. The lower end of the locking block 7 is provided with a toggle portion extending perpendicular to the movement direction of the adjusting rod 6. This increases the locking area and locking performance of the shift block, improving the operational stability of the adjusting rod 6.

[0053] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 As shown, a plurality of gear holes 3.1 are distributed in a circle according to the central axis of the hinge point between the rocker 3 and the base 1.

[0054] Further, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the central axis of the adjusting rod 6 is arranged parallel to the central axis of the shift pin 9 , and the central axis of the hinge point between the rocker 3 and the base 1 is arranged parallel to the central axis of the adjusting rod 6 .

[0055] In the prior art, the seat chassis' bottom plate 2 is positioned above the base 1. One end of the bottom plate 2 is hinged to the base 1 via a rocker plate 3, and the other end is hinged to the base 1 via a connecting plate 4. The bottom plate 2, connecting plate 4, base 1, and rocker plate 3 are hinged end-to-end to form a hinged four-bar mechanism. The seat is mounted on the bottom plate 2, and the backrest is mounted on the rocker plate 3. The rocker plate 3 and bottom plate 2 interact to adjust the seat chassis height and backrest angle. In the prior art, a threaded connection using a screw and nut is often used to lock the rocker plate 3 in the desired position. However, threaded connections are prone to damage and loosening, are cumbersome to operate, and restrict operating space. In this solution, the rocker plate 3 and base 1 are locked together by adjusting the shift pin 9 by moving the adjustment lever 6 into the various shift holes 3.1 on the rocker plate 3. This locks the rocker plate 3 and base 1, thereby locking the rocker plate 3 and base 2. This solution is convenient to operate, has a simple structure, and requires minimal operating space. All components are located within the base 1, and the multiple shift holes 3.1 enable multiple locking positions. The locking structure is robust and extends the product's service life.

[0056] Specifically, it also includes a spring assembly 5, one end of the spring assembly 5 is connected to the connecting plate 4, and the other end is connected to the base 1, so as to improve the comfort of the seat.

[0057] In summary, this embodiment realizes locking between the rocker 3 and the base 1 by moving the gear pin 9 into different gear holes 3.1 on the rocker 3 through the adjustment rod 6, that is, locking between the rocker 3 and the base 2. It is convenient to operate, has a simple structure, and a small operating space. All parts are arranged in the base 1. Several gear holes 3.1 can realize multi-gear locking. The locking structure is firm, which extends the service life of the product.

[0058] The specific embodiments described above are only preferred implementations of the present invention and are not intended to limit the specific scope of implementation of the present invention. All equivalent changes made to the shape and structure of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-position locking device for a seat chassis, comprising a base and a bottom plate, wherein the bottom plate is arranged above the base by adjusting a rocker plate, and the rocker plate is hinged to the base, wherein: The base is provided with an adjusting rod, the adjusting rod is provided with a locking block, the base is provided with an unlocking groove and a locking groove, and the adjusting rod drives the locking block to be clamped in the unlocking groove or the locking groove; a shift pin driven by the adjusting rod is movably provided on the base, and a plurality of shift holes are provided on the side wall of the rocker. When the adjusting rod drives the locking block to be clamped into the locking groove, the shift pin is simultaneously driven to insert into the shift hole to lock the rocker.

2. A multi-position locking device for a seat chassis according to claim 1, characterized in that: A bracket is provided on the base, and the gear pin is movably arranged on the bracket. One end of the gear pin is connected to the adjusting rod, and the other end is matched with the gear hole of the rocker.

3. A multi-position locking device for a seat chassis according to claim 2, characterized in that: The shift pin is connected to the adjusting rod via a torsion spring, and the adjusting rod moves the shift pin via the torsion spring.

4. A multi-position locking device for a seat chassis according to claim 2 or 3, characterized in that: A limiting sleeve is sleeved on the shift pin, and the limiting sleeve is limited in the bracket.

5. A multi-position locking device for a seat chassis according to claim 2 or 3, characterized in that: The inner end of the adjusting rod is inserted into the base and is also inserted into the bracket, and the bracket supports the inner end of the adjusting rod.

6. A multi-position locking device for a seat chassis according to claim 1, 2 or 3, characterized in that: An elastic block is provided on the base, the unlocking groove and the locking groove are located on the elastic block, and an elastic protrusion is formed between the unlocking groove and the locking groove.

7. The multi-position locking device for a seat chassis according to claim 6, characterized in that: The unlocking groove and the locking groove are distributed along the moving direction of the adjusting rod.

8. The multi-position locking device for a seat chassis according to claim 6, characterized in that: The unlocking groove extends perpendicular to the moving direction of the adjusting rod, the locking groove extends perpendicular to the moving direction of the adjusting rod, and the lower end of the locking block is provided with a toggle portion extending perpendicular to the moving direction of the adjusting rod.

9. A multi-position locking device for a seat chassis according to claim 1, 2 or 3, characterized in that: The plurality of gear holes are distributed in a circle according to the central axis of the hinge point between the rocker plate and the base.

10. A multi-position locking device for a seat chassis according to claim 1, 2 or 3, characterized in that: The central axis of the adjusting rod is arranged in parallel with the central axis of the shift pin, and the central axis of the hinge point between the rocker and the base is arranged in parallel with the central axis of the adjusting rod.

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