Seat chassis with self-loading locking structure

Abstract

The utility model discloses a seat chassis with a self-loading locking structure. The seat chassis comprises a chassis main body and a locking assembly, the chassis main body is divided into the mounting base, the chair surface supporting seat and the chair back supporting seat which are sequentially hinged and matched, so that a self-loading structure with an elastic adjustment function is formed in the vertical direction. Meanwhile, a locking block and an adjusting driving assembly are mounted on the mounting base, the locking block is driven by the adjusting driving assembly to be switched between a locking state and an adjusting state, and a locking groove in the chair back supporting seat is maintained and matched, so that the chair back can be locked and maintained after being adjusted to a specified angle; therefore, the requirement of a customer for freely adjusting the chair back and the requirement for locking the tipping angle are met at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of office chair technology, specifically relating to a seat chassis with a self-weight-bearing locking structure. Background Technology

[0002] In the present technology, office chairs have become an indispensable necessity in home or office spaces. Existing swivel chairs include base lifting, backrest rotation, and the self-weight-bearing function of the backrest, which is achieved by springs in the chassis to tilt and support the seat back.

[0003] Publication number "CN221129345U" discloses a self-supporting seat chassis technology, proposing a self-supporting seat chassis including a base, a back connecting plate, a synchronous connecting shaft, and a spring connecting shaft. The spring connecting shaft is connected to the base and has a first self-supporting spring group and a second self-supporting spring group. One end of the first self-supporting spring group is connected to the spring connecting shaft, and the other end of the first self-supporting spring group is fixedly connected to the synchronous connecting shaft. One end of the second self-supporting spring group is fixedly connected to the synchronous connecting shaft, and the other end of the second self-supporting spring group is connected to a self-supporting adjustment mechanism for adjusting the support force of the back connecting plate.

[0004] The aforementioned patent uses multiple sets of self-weighting springs to achieve self-weight adjustment of the tilt angle between the seat chassis and the backrest. However, when the user adjusts the backrest to a specified tilt angle, the mechanism in the aforementioned patent is difficult to lock and maintain that tilt angle, making it difficult to meet the needs of different customers. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, this utility model provides a seat chassis with a self-weight locking structure to solve the technical problem that self-weight seat chassis are difficult to switch freely between locked and adjustable states.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0007] A seat chassis with a self-weight locking structure includes a chassis body and a locking assembly. The chassis body includes a mounting base, a seat support, and a backrest support. The mounting base, seat support, and backrest support are hinged together.

[0008] The locking assembly includes a locking block and an adjustment drive assembly. The locking block is rotatably connected to the mounting base. The backrest support has multiple locking slots that mate with the locking block. The locking block can engage or disengage from the locking slots under the drive of the adjustment drive assembly.

[0009] The adjustment drive assembly includes a drive lever, a transmission cable, and a return torsion spring. The drive lever is rotatably connected to the external seat frame. The two ends of the transmission cable are connected to the drive lever and the locking block, respectively. The return torsion spring is mounted on the pivot of the locking block and is used to rotate the locking block to return it to its original position.

[0010] Furthermore, the outer edge of the locking block is divided into a locking portion and an adjusting portion. The distance from the rotation axis of the locking block to the locking portion is greater than the distance to the adjusting portion.

[0011] Furthermore, a spring is provided between the transmission rope and the locking block.

[0012] Furthermore, a positioning bead assembly is provided on one side of the drive lever, which can extend after the drive lever rotates to maintain the state after the drive lever is turned.

[0013] Furthermore, the positioning bead assembly includes glass beads and an elastic element. The glass beads are mounted on the external seat frame and can extend or retract under the action of the elastic element. Two positioning grooves that mate with the glass beads are provided on the drive lever.

[0014] Furthermore, the mounting base is provided with two spaced-apart first hinge portions. One end of the seat support and the backrest support are respectively hinged to the two first hinge portions. The backrest support has a second hinge portion extending outward in the middle. The other end of the seat support is hinged to the second hinge portion.

[0015] Furthermore, the mounting base is divided into a mounting section and a connecting section. The mounting section is fixed to the lifting end of the office chair. The connecting section has an arc-shaped structure.

[0016] Furthermore, the mounting base, seat support, and backrest support are all made of plastic.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model divides the main chassis into a mounting base, a seat support, and a backrest support that are hinged together in sequence, thus forming a self-supporting structure with elastic adjustment in the vertical direction. Simultaneously, a locking block and an adjustment drive assembly are installed on the mounting base. The adjustment drive assembly drives the locking block to switch between and maintain a locked state. This, combined with the locking groove on the backrest support, allows the backrest to be locked and maintained after adjustment to a specified angle, thereby simultaneously satisfying the customer's needs for both free adjustment of the backrest and locking of the tilt angle.

[0019] 2. This utility model incorporates an elastic element between the transmission rope and the locking block in the adjustment drive assembly. When the user pulls the transmission rope via the drive lever, the spring element is pulled first, causing the locking block to rotate. As the spring element rotates the locking block, the locking part of the locking block misaligns with the locking groove on the chair back support, keeping the locking block unlocked and the spring element stretched. The locking block continues to engage with the corresponding locking groove until its locking part aligns with it, effectively preventing jamming during chair back support angle adjustment caused by the transition between the locking block and the locking grooves in the chair back support. This extends the service life of the office chair to some extent. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the relative positions of the locking block and the backrest support in this utility model. Figure 1 (Enlarged view of part A in the middle)

[0022] Figure 3 This is a schematic diagram of the adjustment drive component in this utility model;

[0023] Figure 4 This is a schematic diagram of the locking block in this utility model. Figure 3 (Enlarged view of part B in the middle section).

[0024] Reference numerals in the attached drawings: 1. Mounting base; 2. Seat support; 3. Backrest support; 4. Locking block; 4-1. Locking part; 4-2. Adjusting part; 5. Drive lever; 6. Transmission rope; 7. Return torsion spring; 8. Spring component; 9. Locking groove. Detailed Implementation

[0025] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1 and 2As shown, a seat chassis with a self-weight-bearing locking structure includes a chassis body and a locking assembly. The chassis body includes a mounting base 1, a seat support 2, and a backrest support 3. All three components—mounting base 1, seat support 2, and backrest support 3—are made of plastic. The mounting base 1 is mounted on the height adjustment end of the office chair. The mounting base 1, seat support 2, and backrest support 3 are hinged together, thus forming a self-weight-bearing structure with elastic adjustment in the vertical direction.

[0028] The locking assembly includes a locking block 4 and an adjustment drive assembly. The mounting base 1 has a mounting groove that mates with the locking block 4. The locking block 4 is rotatably connected within the mounting groove. The backrest support 3 has multiple locking slots 9 that mate with the locking block 4. The locking block 4 can engage or disengage from the locking slots 9 under the drive of the adjustment drive assembly, thereby achieving adjustment, locking, or unlocking between the mounting base 1, the seat support 2, and the backrest support 3.

[0029] Specifically, such as Figure 1 and 3 As shown, the adjustment drive assembly includes a drive lever 5, a transmission rope 6, and a return torsion spring 7. The drive lever 5 is rotatably connected to the external seat frame. The two ends of the transmission rope 6 are connected to the drive lever 5 and the locking block 4, respectively. Initially, the locking block 4 is entirely within the mounting groove. The mounting base 1, seat support 2, and backrest support 3 are unlocked, allowing the user to freely tilt and adjust the angle between the backrest and seat. When the desired angle is reached, the user moves the drive lever 5, which, driven by the transmission rope 6, rotates the locking block 4, causing its outer end to engage with the locking groove 9 on the backrest support 3, thus locking the relative angle between the mounting base 1, seat support 2, and backrest support 3. The return torsion spring 7 is mounted on the pivot of the locking block 4. When the user releases the pressure applied to the drive lever 5, it rotates the locking block 4, disengaging it from the locking groove 9 on the backrest support 3 during rotation, thereby locking the adjusted position of the backrest support 3.

[0030] like Figure 3 and 4 As shown, the outer edge of the locking block 4 is divided into a locking part 4-1 and an adjusting part 4-2. The distance from the rotation axis of the locking block 4 to the locking part 4-1 is greater than the distance to the adjusting part 4-2. Initially, under the action of the return torsion spring 7, the adjusting part 4-2 of the locking block 4 faces the backrest support 3, ensuring that the entire locking block 4 is positioned within the mounting groove of the mounting base 1. When the locking block 4 rotates under the drive of the transmission rope 6, the locking part 4-1 of the locking block 4 gradually engages with the corresponding locking groove 9 of the backrest support 3, thereby locking the angular position of the backrest support 3.

[0031] Furthermore, a spring 8 is provided between the transmission cable 6 and the locking block 4. When the user pulls the transmission cable 6 via the drive lever 5, the spring 8 is pulled first, causing the locking block 4 to rotate. When the spring 8 rotates the locking block 4, the locking part 4-1 of the locking block 4 is misaligned with the locking groove 9 on the backrest support 3, and the locking block 4 remains unlocked, while the spring 8 is stretched. The user continues to adjust the tilt angle of the backrest support 3 until the locking part 4-1 of the locking block 4 is aligned with the locking groove 9 on the backrest support 3. At this point, the spring 8 retracts and resets, causing the locking part 4-1 of the locking block 4 to engage with the corresponding locking groove 9.

[0032] Furthermore, a positioning bead assembly is provided on one side of the drive lever 5 to maintain the state after the drive lever 5 is turned, thereby keeping the locking block 4 in the locked state.

[0033] In this embodiment, the positioning bead assembly includes a glass bead and an elastic element. The glass bead is mounted on the external seat frame and can extend or retract under the action of the elastic element. The drive lever 5 has two positioning grooves that mate with the glass bead, corresponding to the locked and unlocked states of the locking block 4, respectively. When the locking block 4 needs to be switched from the unlocked to the locked state, the drive lever 5 is turned, causing the glass bead to retract as the drive lever 5 rotates. When the drive lever 5 rotates to the corresponding position, the glass bead is inserted into the corresponding positioning groove under the action of the elastic element, allowing the locking block 4 to remain in the locked state.

[0034] In this embodiment, the mounting base 1 has two spaced-apart first hinge portions. One end of the seat support 2 and the backrest support 3 is hinged to the two first hinge portions respectively. The backrest support 3 has a second hinge portion extending outward in the middle. The other end of the seat support 2 is hinged to the second hinge portion.

[0035] Furthermore, the mounting base 1 is divided into a mounting section and a connecting section. The mounting section is fixed to the height adjustment end in the office chair. The connecting section has an arc-shaped structure.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A seat chassis with a self-weight locking structure, comprising a chassis body; the chassis body comprising a mounting base (1), a seat support (2), and a backrest support (3); wherein the mounting base (1), the seat support (2), and the backrest support (3) are hinged together, characterized in that: It also includes a locking component. The locking assembly includes a locking block (4) and an adjustment drive assembly; the locking block (4) is rotatably connected to the mounting base (1); the backrest support (3) has multiple locking slots (9) that cooperate with the locking block (4); the locking block (4) can be inserted into or disengaged from the locking slots (9) under the drive of the adjustment drive assembly. The adjustment drive assembly includes a drive lever (5), a transmission rope (6), and a reset torsion spring (7); the drive lever (5) is rotatably connected to the external seat frame; the two ends of the transmission rope (6) are respectively connected to the drive lever (5) and the locking block (4); the reset torsion spring (7) is installed on the rotating shaft of the locking block (4) and is used to drive the locking block (4) to rotate and reset.

2. A seat chassis with a self-weight-bearing locking structure according to claim 1, characterized in that: The outer edge of the locking block (4) is divided into a locking part (4-1) and an adjusting part (4-2) in sequence; the distance from the rotation axis of the locking block (4) to the locking part (4-1) is greater than the distance to the adjusting part (4-2).

3. A seat chassis with a self-weight-bearing locking structure according to claim 1, characterized in that: A spring (8) is provided between the transmission rope (6) and the locking block (4).

4. A seat chassis with a self-weight-bearing locking structure according to claim 1, characterized in that: A positioning bead assembly is provided on one side of the drive lever (5). The positioning bead assembly can extend after the drive lever (5) rotates to maintain the state after the drive lever (5) is turned.

5. A seat chassis with a self-weight-bearing locking structure according to claim 4, characterized in that: The positioning bead assembly includes a glass bead and an elastic element; the glass bead is installed on the external seat frame and can extend outward or retract inward under the action of the elastic element; the drive lever (5) has two positioning grooves that cooperate with the glass bead.

6. A seat chassis with a self-weight-bearing locking structure according to claim 1, characterized in that: The mounting base (1) is provided with two spaced first hinge parts; one end of the seat support (2) and the back support (3) are respectively hinged to the two first hinge parts; the back support (3) is provided with an outwardly extending second hinge part in the middle; the other end of the seat support (2) is hinged to the second hinge part.

7. A seat chassis with a self-weight-bearing locking structure according to claim 1, characterized in that: The mounting base (1) is divided into a mounting part and a connecting part; the mounting part is fixed on the lifting end of the office chair; the connecting part has an arc-shaped structure.

8. A seat chassis with a self-weight-bearing locking structure according to claim 1, characterized in that: The mounting base (1), seat support (2) and back support (3) are all made of plastic.

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