Seat pan motion mechanism

Abstract

This utility model belongs to the field of small car seat technology, specifically a seat chassis motion mechanism, including a pitch linkage mechanism. The pitch linkage mechanism includes a backrest assembly, threaded bolts, a first step pin, a pitch guide rail, a first spring, a second spring, a lower seat chassis frame, an upper seat chassis frame, and a seat cushion assembly. The backrest assembly and the upper seat chassis frame are connected by threaded bolts. The structure designed in this application enables the seat chassis to have the function of linkage between the backrest assembly and the seat cushion assembly, while also considering the unlocking and locking of the linkage mechanism, as well as the forward and backward sliding function of the seat cushion assembly. This allows different people to find their own comfortable seating position when sitting in the car. The compression characteristics of the first spring provide support for the pitch linkage mechanism; when the backrest assembly is pressed backward by a person, the first spring stores energy, providing support for the person and the backrest assembly to return to their original position.

Description

Technical Field

[0001] This utility model relates to the field of small car seat technology, specifically a seat chassis motion mechanism. Background Technology

[0002] Small mobility scooters or wheelchairs have the advantages of being compact and convenient for single-person use. They are moved by a drive device (such as a motor), making them convenient for the elderly or people with mobility impairments to get around in cities.

[0003] Most existing small mobility scooters or wheelchairs have fixed backrests, while a few have adjustable backrests. However, most of these adjustments only allow for individual backrest adjustments, making it difficult to adjust the backrest and seat together. As a result, these small mobility scooters or wheelchairs cannot adequately accommodate different sitting postures and body weights. Therefore, a seat chassis motion mechanism is proposed to address these issues. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes a seat chassis motion mechanism.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The seat chassis motion mechanism of this utility model includes a pitch linkage mechanism, wherein the pitch linkage mechanism includes a backrest assembly, a threaded bolt, a first step pin, a pitch guide rail, a first spring, a second spring, a lower frame of the seat chassis, an upper frame of the seat chassis, and a seat cushion assembly; the backrest assembly is connected to the upper frame of the seat chassis by a threaded bolt, and the backrest assembly is connected to the lower frame of the seat chassis by a first step pin; the pitch guide rail is fixedly connected to the lower frame of the seat chassis, and the upper frame of the seat chassis is connected to the pitch guide rail by a first step pin; the two ends of the second spring are respectively connected to the pitch guide rail and the upper frame of the seat chassis.

[0006] Furthermore, a sliding unlocking handle is provided on the upper frame of the seat chassis, and a third spring and a spring pin are fixedly installed on the sliding unlocking handle. The sliding unlocking handle is connected to the upper frame of the seat chassis through a second step pin.

[0007] Furthermore, the spring pin passes through the upper frame of the seat chassis, the seat cushion sliding guide rail, and the seat sliding groove.

[0008] Furthermore, the seat assembly is provided with a pitch unlock handle and a pitch unlock handle mounting base. The pitch unlock handle and the pitch unlock handle mounting base are connected by a second step pin. The pitch unlock handle is limited and locked by a positioning bead on the pitch unlock handle mounting base.

[0009] Furthermore, the upper frame of the seat chassis is provided with a pitch locking pin and a pitch unlocking pin mounting seat. The pitch locking pin and the pitch unlocking pin mounting seat are connected by a first spring and a pin. One end of the pitch locking pin is connected to a pitch unlocking connecting rod. The pitch unlocking connecting rod is connected to a pitch unlocking handle by a pin.

[0010] Furthermore, one side of the seat assembly is provided with a seat base decoration, which is connected to the seat assembly by screws.

[0011] Furthermore, the backrest assembly has an arc-shaped cross-section, and the surface of the backrest assembly is made of a non-slip material.

[0012] Furthermore, the seat base decoration is made of lightweight material and has several threaded holes.

[0013] Furthermore, the number of seat sliding grooves and seat cushion sliding rails are corresponding, and the seat sliding grooves and seat cushion sliding rails are symmetrically designed.

[0014] Furthermore, the seat cushion assembly is inclined, with the seat cushion assembly being lower near the backrest assembly and higher away from the backrest assembly.

[0015] The advantages of this utility model are:

[0016] 1. This utility model utilizes the adjustable bolt elongation to compress and store energy in the first spring, thus adapting to different body weights. The spring pin passes through the seat chassis frame, the seat cushion sliding guide rail, and the seat sliding groove, thereby locking the seat cushion sliding guide rail and the seat sliding guide groove. By pressing the tilt unlock handle, the positioning bead is compressed and disengaged from the limiting groove. Under the action of compressing the first spring, the tilt unlock connecting rod slides, causing the tilt lock pin to enter the locking hole in the seat chassis frame, thus locking the tilt unlock mechanism. By pulling up the tilt unlock handle, the tilt unlock connecting rod slides, causing the tilt lock pin to disengage from the locking hole in the seat chassis frame. During the disengagement of the tilt lock pin, the first spring is compressed and stores energy. As the tilt unlock handle is lifted, the positioning bead is compressed and enters the limiting groove of the tilt unlock handle, thus unlocking the tilt unlock mechanism. Raising the sliding unlock handle and rotating it around the second step pin on the seat chassis frame causes the spring pin to disengage from the seat sliding groove, thus unlocking the seat cushion sliding guide rail and the seat sliding groove.

[0017] 2. This utility model, through its designed structure, enables the seat chassis to have the function of linking the backrest assembly and the seat cushion assembly. It also considers the unlocking and locking of the linkage mechanism, as well as the forward and backward sliding function of the seat cushion assembly, allowing different people to find their own comfortable seating position. The compression characteristics of the first spring provide support for the tilt linkage mechanism; when the backrest assembly is pressed backward by a person, the first spring stores energy, providing support for the person and backrest assembly to return to their original position; adjusting the bolt extension allows the second spring to compress and store energy, thus accommodating different body weights. Simultaneously, utilizing the compression characteristics of the third spring and the elasticity of the spring pin, lifting the sliding unlock handle rotates around the second step pin on the seat chassis frame, compressing and storing energy in the third spring, causing the third spring pin to disengage from the seat sliding groove, completing the unlocking of the seat cushion sliding guide rail; releasing the sliding unlock handle, under the action of the third spring, causes the sliding unlock handle to rotate around the second step pin on the seat chassis frame, causing the spring pin to enter the seat sliding groove, completing the locking of the seat cushion guide rail. It also utilizes the compression characteristics of the third spring. When the pitch unlock handle is pulled up, it causes the pitch unlock connecting rod to slide, causing the pitch lock pin to exit the lock hole on the frame of the seat chassis. During the process of the pitch lock pin exiting, the first spring is compressed to store energy. During the process of the pitch unlock handle being lifted, the positioning bead is compressed and enters the pitch unlock handle limit groove, so that the pitch unlock mechanism completes the unlocking. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view structural diagram of this utility model;

[0020] Figure 2 This is a side view of the backrest assembly in this utility model.

[0021] Figure 3 This is a schematic diagram of the linkage adjustment between the backrest assembly and the seat cushion assembly in this utility model;

[0022] Figure 4 This is an exploded structural diagram of the present invention;

[0023] Figure 5 This is a schematic diagram of the internal structure of the seat cushion assembly in this utility model;

[0024] Figure 6 This is a top view of the backrest assembly in this utility model.

[0025] Figure 7 This utility model Figure 6 Schematic diagram of the structure along section AA;

[0026] Figure 8 This utility model Figure 6 Schematic diagram of the structure viewed along the CC axis;

[0027] Figure 9 This utility model Figure 6 Schematic diagram of the structure along the BB section;

[0028] Figure 10 This utility model Figure 2 Schematic diagram of the structure in cross section along DD;

[0029] Figure 11 This utility model Figure 6 Schematic diagram of the structure in cross section along EE.

[0030] In the diagram: 1. Backrest assembly; 2. Threaded bolt; 3. Seat cushion chassis trim; 4. First step pin; 5. Pitch unlock pin mounting bracket; 6. Pitch guide rail; 7. First spring; 8. Pitch lock pin; 9. Pitch unlock connecting rod; 10. Pitch unlock handle; 11. Pitch unlock handle mounting bracket; 12. Second spring; 13. Seat chassis lower frame; 14. Spring pin; 15. Second step pin; 16. Third spring; 17. Slide unlock handle; 18. Seat sliding groove; 19. Seat cushion sliding guide rail; 20. Seat chassis upper frame; 21. Seat cushion assembly; 22. Positioning bead. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] Please see Figure 1-11As shown, a seat chassis motion mechanism includes a pitch linkage mechanism, which comprises a backrest assembly 1, a threaded bolt 2, a first step pin 4, a pitch guide rail 6, a first spring 7, a second spring 12, a lower seat chassis frame 13, an upper seat chassis frame 20, and a seat cushion assembly 21. The backrest assembly 1 is connected to the upper seat chassis frame 20 via the threaded bolt 2, and the backrest assembly 1 is connected to the lower seat chassis frame 13 via the first step pin 4. The pitch guide rail 6 is fixedly connected to the lower seat chassis frame 13, and the upper seat chassis frame 20 is connected to the pitch guide rail 6 via the first step pin 4. The two ends of the second spring 12 are respectively connected to the pitch guide rail 6 and the upper seat chassis frame 20. A sliding unlock handle 17 is provided on the upper seat chassis frame 20, and a third spring 16 and a spring pin 14 are fixedly installed on the sliding unlock handle 17. The sliding unlock handle 17 is connected to the upper seat chassis frame 20 via the second step pin 15.

[0033] Specifically, the spring pin 14 passes through the upper frame 20 of the seat chassis, the seat cushion sliding guide rail 19, and the seat sliding groove 18. The seat cushion assembly 21 is equipped with a pitch unlock handle 10 and a pitch unlock handle mounting seat 11. The pitch unlock handle 10 and the pitch unlock handle mounting seat 11 are connected by a second step pin 15. The pitch unlock handle 10 is limited and locked by a positioning bead 22 on the pitch unlock handle mounting seat 11. The upper frame 20 of the seat chassis is equipped with a pitch locking pin 8 and a pitch unlock pin mounting seat 5. The pitch locking pin 8 and the pitch unlock pin mounting seat 5 are connected by a first spring 7 and a pin. One end of the pitch locking pin 8 is connected to a pitch unlock connecting rod 9, and the pitch unlock connecting rod 9 is connected to the pitch unlock handle 10 by a pin. One side of the seat cushion assembly 21 is equipped with a seat cushion base decoration 3, which is connected to the seat cushion assembly 21 by screws.

[0034] Specifically, the backrest assembly 1 has an arc-shaped cross-section, and its surface is made of a non-slip material. The seat cushion base decoration 3 is made of a lightweight material and has several threaded holes. The number of seat sliding grooves 18 and seat cushion sliding guides 19 corresponds, and they are symmetrically designed. The seat cushion assembly 21 is inclined, with a lower section near the backrest assembly 1 and a higher section away from it.

[0035] During operation, the upper frame 20 of the seat chassis slides along the fixed direction of the pitch guide rail 6, thereby achieving the linkage function of the backrest assembly 1 tilting backward and the seat cushion assembly 21 moving forward. During the forward movement of the upper frame 20 of the seat chassis, the second spring 12 is compressed to store energy, providing energy for the backrest assembly 1 to return to its original position. The extension of the bolt is adjusted to compress and store energy for the first spring 7, thus accommodating different body weights. The spring pin 14 passes through the upper frame 20 of the seat chassis, the seat cushion sliding guide rail 19, and the seat sliding groove 18, thereby locking the seat cushion sliding guide rail 19 with the seat sliding guide groove. By pressing the pitch unlocking handle 10, the positioning bead 22 is compressed and disengaged from the limiting groove. Under the action of the compressed first spring 7, the pitch unlocking connecting rod 9 slides, causing the pitch locking pin 8 to enter the locking hole of the upper frame 20 of the seat chassis, thus locking the pitch unlocking mechanism.

[0036] Pulling up the pitch unlocking handle 10 causes the pitch unlocking connecting rod 9 to slide, causing the pitch locking pin 8 to disengage from the locking hole of the upper frame 20 of the seat chassis. During the disengagement of the pitch locking pin 8, the first spring 7 is compressed to store energy. As the pitch unlocking handle 10 is lifted, the positioning bead 22 is compressed and enters the limiting groove of the pitch unlocking handle 10, thus completing the unlocking of the pitch unlocking mechanism. Lifting the sliding unlocking handle 17 rotates it around the second step pin 15 on the upper frame 20 of the seat chassis, causing the spring pin 14 to disengage from the seat sliding groove 18, thus completing the unlocking of the seat cushion sliding guide rail 19 from the seat sliding groove 18.

[0037] The structure designed in this application enables the seat chassis to link the backrest assembly 1 and the seat cushion assembly 21. It also incorporates unlocking and locking mechanisms, as well as the forward and backward sliding function of the seat cushion assembly 21, allowing different individuals to find their comfortable seating position. The compression characteristics of the first spring 7 provide support for the tilting linkage mechanism; when the backrest assembly 1 is pressed backward by a person, the first spring 7 stores energy, providing support for the return of the person and the backrest assembly 1 to its original position; adjusting the extension of the bolt compresses and stores energy in the second spring 12, thus adapting to different body weights. Simultaneously utilizing the compression characteristics of the third spring 16 and the elasticity of the spring pin 14, the sliding unlocking handle 17 is raised and rotated around the second step pin 15 on the upper frame 20 of the seat chassis. The third spring 16 is compressed and stores energy, causing the third spring pin 14 to disengage from the seat sliding groove 18, thus unlocking the seat cushion sliding guide rail 19. Releasing the sliding unlocking handle 17, under the action of the third spring 16, causes the sliding unlocking handle 17 to rotate around the second step pin 15 on the upper frame 20 of the seat chassis, causing the spring pin 14 to enter the seat sliding groove 18, thus locking the seat cushion guide rail. The compression characteristics of the third spring 16 are also utilized. Pulling up the pitch unlocking handle 10 causes the pitch unlocking connecting rod 9 to slide, causing the pitch locking pin 8 to disengage from the locking hole of the upper frame 20 of the seat chassis. During the disengagement of the pitch locking pin 8, the first spring 7 is compressed and stores energy. During the lifting of the pitch unlocking handle 10, the positioning bead 22 is compressed and enters the limiting groove of the pitch unlocking handle 10, thus unlocking the pitch unlocking mechanism.

[0038] Working principle: During the seat chassis upper frame 20 movement, it slides along the fixed direction of the pitch guide rail 6, thereby realizing the linkage function of the backrest assembly 1 tilting backward and the seat cushion assembly 21 moving forward. During the forward movement of the seat chassis upper frame 20, the second spring 12 is compressed to store energy, providing energy for the backrest assembly 1 to return to its original position. The extension of the bolt is adjusted to compress and store energy for the first spring 7, thus adapting to different body weights. The spring pin 14 passes through the seat chassis upper frame 20, the seat cushion sliding guide rail 19, and the seat sliding groove 18, thereby locking the seat cushion sliding guide rail 19 with the seat sliding guide groove. By pressing the pitch unlock handle 10, the positioning bead 22 is compressed and disengaged from the limiting groove. Under the action of the compressed first spring 7, the pitch unlock connecting rod 9 slides, causing the pitch lock pin 8 to enter the lock hole of the seat chassis upper frame 20, thus locking the pitch unlock mechanism.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A seat pan motion mechanism characterized by: The system includes a pitch linkage mechanism, which comprises a backrest assembly (1), a threaded bolt (2), a first step pin (4), a pitch guide rail (6), a first spring (7), a second spring (12), a lower frame of the seat chassis (13), an upper frame of the seat chassis (20), and a seat cushion assembly (21). The backrest assembly (1) is connected to the upper frame (20) of the seat chassis by threaded bolts (2), and the backrest assembly (1) is connected to the lower frame (13) of the seat chassis by a first step pin (4). The pitch guide rail (6) is fixedly connected to the lower frame (13) of the seat chassis, and the upper frame (20) of the seat chassis is connected to the pitch guide rail (6) through the first step pin (4). The two ends of the second spring (12) are respectively connected to the pitch guide rail (6) and the upper frame (20) of the seat chassis.

2. A seat pan motion mechanism according to claim 1, characterized in that: A sliding unlocking handle (17) is provided on the upper frame (20) of the seat chassis. A third spring (16) and a spring pin (14) are fixedly installed on the sliding unlocking handle (17). The sliding unlocking handle (17) is connected to the upper frame (20) of the seat chassis through a second step pin (15).

3. A seat pan motion mechanism according to claim 2, wherein: The spring pin (14) passes through the upper frame (20) of the seat chassis, the seat cushion sliding guide (19) and the seat sliding groove (18).

4. The seat chassis motion mechanism according to claim 1, characterized in that: The seat assembly (21) is provided with a pitch unlock handle (10) and a pitch unlock handle mounting base (11). The pitch unlock handle (10) and the pitch unlock handle mounting base (11) are connected by a second step pin (15). The pitch unlock handle (10) is limited and locked by a positioning bead (22) on the pitch unlock handle mounting base (11).

5. A seat pan motion mechanism according to claim 1, characterized in that: The upper frame (20) of the seat chassis is provided with a pitch locking pin (8) and a pitch unlocking pin mounting seat (5). The pitch locking pin (8) and the pitch unlocking pin mounting seat (5) are connected by a first spring (7) and a pin. One end of the pitch locking pin (8) is connected to a pitch unlocking connecting rod (9). The pitch unlocking connecting rod (9) is connected to a pitch unlocking handle (10) by a pin.

6. A seat pan motion mechanism according to claim 1, characterized in that: One side of the seat assembly (21) is provided with a seat base decoration (3), which is connected to the seat assembly (21) by screws.

7. A seat pan motion mechanism according to claim 1, wherein: The backrest assembly (1) has an arc-shaped cross section, and the surface of the backrest assembly (1) is made of a non-slip material.

8. A seat pan motion mechanism according to claim 6, characterized in that: The seat base decoration (3) is made of lightweight material and has several threaded holes.

9. A seat pan motion mechanism according to claim 3, wherein: The number of seat sliding grooves (18) and seat cushion sliding rails (19) are corresponding, and the seat sliding grooves (18) and seat cushion sliding rails (19) are symmetrically designed.

10. A seat pan motion mechanism according to claim 1, characterized in that: The seat cushion assembly (21) is inclined, with the seat cushion assembly (21) being lower near the backrest assembly (1) and higher away from the backrest assembly (1).

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