A chair and its plastic self-loading chassis

Abstract

The application discloses a chair and a plastic self-loading chassis thereof. The chair comprises a base for connecting chair legs, a top seat for mounting a chair seat, a tail seat for mounting a chair back and a tension spring. The base and the tail seat are hinged through a first hinge shaft, the top seat and the tail seat are hinged through a second hinge shaft, the tail seat is hinged with the base through the first hinge shaft, the front part of the tail seat is hinged with the bottom part of the top seat through the second hinge shaft, and the second hinge shaft is located above the front side of the first hinge shaft. The chassis further comprises a swing part and an extension part. The bottom part of the swing part is hinged with the base through a third hinge shaft, the top part of the swing part, the top seat and a part of the extension part are hinged through a fourth hinge shaft, and the other part of the extension part is connected with the base. The fourth hinge shaft is located at the rear side of the second hinge shaft. The base and the top seat are made of plastic. In this way, the weight of the chair can be reduced, and the thickness of the chassis can be reduced.

Description

Technical Field

[0001] This invention relates to the field of home furnishings, and more particularly to a chair and its plastic self-supporting chassis. Background Technology

[0002] The base of a chair, also known as the tray, is an important component that connects the seat, backrest, and legs. Modern swivel chair trays typically consist of an upper tray, lower support beam, pivot, and spring mechanism. Once the upper tray is fixed to the back of the swivel chair, the chair can tilt appropriately around the pivot and automatically return to its original position.

[0003] Patent document CN102846068B discloses a swivel chair chassis, including a base plate connected to a gas spring, which supports the entire chassis, seat, and backrest. A support plate is provided vertically on each of the left and right sides of the base plate, and the support plates are fixedly connected to the base plate. A seat plate for mounting the seat is provided horizontally above the two support plates. Support frames and backrest brackets inclined towards the front of the swivel chair are provided on the front and rear sides of the base plate, respectively. The lower parts of the support frames and backrest brackets are hinged to the two support plates. The front and rear sides of the seat plate are hinged to the tops of the support frames and backrest brackets, respectively. The backrest bracket is connected to the backrest via a connecting steel plate, and the backrest bracket is connected to an elastic reset device that tilts it towards the front of the swivel chair. Specifically, the support frame has a U-shaped structure, including two parallel pins arranged vertically, which are fixedly connected by two parallel connecting rods arranged horizontally; alternatively, a single connecting rod can also be used. The backrest bracket also has two parallel pins arranged vertically, which pass through the side plates on both sides of the backrest bracket. The pins at the bottom of the support frame and backrest bracket are hinged to the support plate. The lower part of the seat plate has four lugs, which are hinged to the pins at the top of the support frame and backrest bracket via the lugs. The elastic return device is a spring, with one part of the spring connected to the pin at the top of the backrest bracket and the other part connected to the pin at the bottom of the support frame. In actual use, 2 to 4 springs can be used as needed.

[0004] In existing technology, the front of the seat and the front of the base are hinged by two parallel connecting rods, and the rear of the seat and the rear of the base are hinged by the side plates on the left and right sides of the backrest bracket. The two parts of the spring are connected to the backrest bracket and the base respectively. The connections between the seat, the base, and the backrest bracket are all concentrated in the front and rear parts of the base. This overly concentrated connection structure results in a large vertical movement of the seat, making the base larger and the overall structure heavier. Moreover, the base, seat, and side panels of chairs on the market are usually made of bent and welded metal parts. After the base is assembled on the chair, a shell needs to be wrapped around the base to increase the chair's appearance, which makes the chair base even heavier. Summary of the Invention

[0005] To address the issue of the relatively heavy overall weight of chair chassis in existing technologies, the present invention aims to provide a chair and its plastic self-supporting chassis, wherein the top seat and base of the chassis are made of lighter and easier-to-mold plastic material, and by reducing the swing amplitude of the top seat, the vertical length of the chassis components is reduced, thereby making the chassis thinner.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a plastic self-loading chassis, comprising a base, a top seat, and a tail seat, wherein the base and tail seat are hinged by a first hinge axis, the top seat and tail seat are hinged by a second hinge axis, and the front part of the tail seat is hinged to the front part of the top seat by the second hinge axis; it also includes a swing member and a telescopic member, wherein the bottom of the swing member is hinged to the rear part of the base by a third hinge axis, and the top of the swing member is hinged to the rear part of the top seat by a fourth hinge axis, the fourth hinge axis being connected to the base by the telescopic member, thereby giving the swing member a downward rotation tendency through the telescopic member, the fourth hinge axis being located behind the second hinge axis; both the base and the top seat are made of plastic.

[0007] Preferably, the tailstock includes two first connecting plates arranged symmetrically on the left and right, the rear parts of the two first connecting plates are fixedly connected by a second connecting plate, the two first connecting plates extend forward, a first hinge shaft respectively hinges the two first connecting plates to the base, the front parts of the two first connecting plates are hinged to the bottom of the top seat by a second hinge shaft, and the swing member is located between the two first connecting plates.

[0008] Preferably, the base is also provided with two positioning grooves that extend backward and forward, the positioning grooves extending backward and penetrating the base, and the two first connecting plates of the tailstock are respectively inserted into the two positioning grooves and hinged to the base through the first hinge shaft.

[0009] Preferably, the telescopic component is a tension spring, with its two ends connected to the fourth hinge shaft and the base, respectively.

[0010] Preferably, the system also includes a first mounting base and a second mounting base, both of which are provided with spiral grooves. The first mounting base is sleeved on the fourth hinge shaft, and the second mounting base is hinged to the base. One end of the tension spring is wound in the groove of the first mounting base, and the other end of the tension spring is wound in the groove of the second mounting base.

[0011] Preferably, the second mounting base is hinged to the base via a fifth hinge axis, which is located below the front of the tailstock.

[0012] As a preferred option, two of each of the tension spring, the first mounting base, and the second mounting base are provided, and the two tension springs, the two first mounting bases, and the two second mounting bases are arranged symmetrically from left to right.

[0013] Preferably, both second mounting seats are fixed on the hinge seat, and the hinge seat is sleeved on the fifth hinge shaft.

[0014] Preferably, the bottom of the hinge seat is provided with a limiting groove, and the base has a first limiting part protruding to prevent the hinge seat from moving laterally, and the first limiting part is inserted into the limiting groove.

[0015] A chair comprising the aforementioned plastic self-supporting chassis.

[0016] The beneficial effects of the technical solution of the present invention are as follows: the tailstock and the top stock undergo multiple transmissions, making the movement range of the top stock much smaller than that of the tailstock. Furthermore, both the top stock and the tailstock are made of plastic, which facilitates molding and makes the shape more aesthetically pleasing. On the other hand, it can reduce the weight of the chassis and reduce the cost of the chassis. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the plastic self-loading chassis in this invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the plastic self-loading chassis in this invention. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the structure of the plastic self-loading chassis in this invention. Figure 3 ;

[0020] Figure 4 This is a schematic diagram of the connection structure between the telescopic component and the hinge seat.

[0021] Figure 5 This is a schematic diagram of the hinged base.

[0022] Figure 6 This is a schematic diagram of the base structure;

[0023] Figure 7 This is a schematic diagram of the swing component.

[0024] Reference numerals: 1. Base; 11. Baffle; 12. First connecting part; 14. Positioning groove; 16. Mounting hole; 17. First limiting part; 18. Through hole; 2. Tail seat; 21. Second connecting plate; 22. First connecting plate; 23. Third connecting plate; 3. Top seat; 31. Covering part; 4. First hinge shaft; 5. Second hinge shaft; 61. Third hinge shaft; 62. Swinging component; 621. Second connecting part; 622. Mounting port; 63. Fourth hinge shaft; 64. First mounting seat; 65. Tension spring; 66. Hinge seat; 663. Second mounting seat; 665. Limiting groove; 67. Fifth hinge shaft. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The front, back, left, and right directions described in the following embodiments are consistent with the front, back, left, and right directions of the chair product. The side with the chair back is the back, and the side opposite the chair back is the front. The front and back are further divided into left and right.

[0031] Example

[0032] like Figure 1-3 The disclosed plastic self-supporting chassis includes a base 1 for connecting chair legs, a top seat 3 for mounting the chair seat, a tail seat 2 for mounting the chair back, and a tension spring 65. The base 1 and tail seat 2 are hinged by a first hinge shaft 4, and the top seat 3 and tail seat 2 are hinged by a second hinge shaft 5. The front part of the tail seat 2 is hinged to the front part of the top seat 3 by the second hinge shaft 5, which is located above the front side of the first hinge shaft 4. The chassis also includes a swing member 62 and a telescopic member. The bottom of the swing member 62 is hinged to the rear part of the base 1 by a third hinge shaft 61, and the top part of the swing member 62 is hinged to the rear part of the top seat 3 by a fourth hinge shaft 63. The fourth hinge shaft 63 is connected to the front part of the base 1 by the telescopic member, thereby giving the swing member 62 a downward rotation tendency through the telescopic member. The fourth hinge shaft 63 is located behind the second hinge shaft 5. Both the base 1 and the top seat 3 are made of plastic.

[0033] With this configuration, in the above structure, using the first hinge shaft as the fulcrum, a first lever arm is formed from the first hinge shaft to the rear of the tailstock; a second lever arm is formed from the first hinge shaft to the second hinge shaft; a third lever arm is formed from the second hinge shaft to the fourth hinge shaft; and a fourth lever arm is formed from the fourth hinge shaft to the third hinge shaft. Thus, during the chassis adaptive adjustment process, when the user sits on the chair with their back against the backrest, the force applied to the backrest drives the tailstock 2 to swing around the first hinge shaft 4 as the fulcrum. When the tailstock 2 swings... The front part of the tail seat 2 lifts the top seat 3 via the second hinge shaft 5, causing the front part of the top seat 3 to move backward and upward around the first hinge shaft 4. When the top seat 3 moves, it pulls the swing member 62 via the fourth hinge shaft 63, causing the swing member 62 to swing backward around the third hinge shaft 61, and then extends the telescopic member via the fourth hinge shaft 63. When the user leans forward or the user stands up, the telescopic member pulls the top seat and the swing member 62 back to their original positions via the fourth hinge shaft 63. The top seat 3 drives the tail seat 2 to its original position via the second hinge shaft 5. When the tail seat 2 is reset, it can drive the chair back to move with the user's back.

[0034] In this way, during the adaptive adjustment of the chassis, the position of any hinge axis can be regarded as the fulcrum of the lever principle. By gradually reducing the length of each lever arm, the swing distance of the tailstock gradually shortens through multiple hinge axes connected in sequence during the adaptive adjustment process, resulting in very slight movement of the top seat, and thus the chassis volume can be smaller. Furthermore, both the base and the top seat are made of plastic, which facilitates molding, makes the shape more beautiful, and allows for more complex structures. On the other hand, it can reduce the weight of the chassis and reduce the cost of the chassis.

[0035] To facilitate the installation of the tailstock 2, top seat 3, and base 1, in this embodiment, as follows: Figure 2 , Figure 3 , Figure 6 and Figure 7 The tailstock 2 includes two symmetrically arranged first connecting plates 22. The rear parts of the two first connecting plates 22 are fixedly connected by a second connecting plate 21. The two first connecting plates 22 extend forward. There are two first hinge shafts 4, which respectively hinge the two first connecting plates 22 to the base 1. The front parts of the two first connecting plates 22 are hinged to the bottom of the top seat 3 by a second hinge shaft 5. The swing member 62 is located between the two first connecting plates 22. The base 1 has an open mounting cavity. The left and right sides of the mounting cavity are provided with upward-opening positioning grooves 14. The positioning grooves 14 extend backward and penetrate the base 1. The two first connecting plates 22 of the tailstock 2 are respectively inserted into the two positioning grooves 14. There are two first hinge shafts 4, which correspond one-to-one with the two first connecting plates 22. The connecting plate 22 is hinged to the middle position of the base 1 via the first hinge shaft 4. The front parts of the two first connecting plates 22 are raised upwards and extend beyond the base 1. The second hinge shaft 5 extends laterally to connect the two first connecting plates 22 to the top seat 3. There are two left and right first connecting parts 12 protruding inside the mounting cavity, and two left and right second connecting parts 621 protruding at the bottom of the swing member 62. The two first connecting parts 12 are located between the two second connecting parts 621. The third hinge shaft 61 passes through the first connecting parts 12 and the second connecting parts 621, hinges the base 1 and the swing member 62. In order to facilitate the installation of the third hinge shaft 61, a through hole 18 coaxial with the third hinge shaft 61 is provided on the side of the base 1. In this way, the third hinge shaft 61 can be inserted into the mounting cavity through the through hole 18 to hinge the base 1 and the swing member 62. In order to increase the overall strength of the base, in this embodiment, crisscrossing reinforcing ribs are provided on the inner side of the mounting cavity and the fixing groove 14.

[0036] To further expand the target audience for the chassis, such as Figure 2-5As shown, in this embodiment, there are two telescopic components, which are symmetrically arranged on the left and right. The top of each telescopic component is hinged to the swing component 62, and the other part of each telescopic component is fixed to the hinge seat 66, which is hinged to the base. In this way, the movement of the telescopic components is more flexible, and the symmetrical arrangement of the two telescopic components makes the adjustment process of the chassis more stable and can withstand greater forces, thus making the chassis more applicable. More preferably, the telescopic component includes a tension spring 65, with a first mounting seat 64 and a second mounting seat 663 respectively mounted at both ends of the tension spring. Both the first mounting seat 64 and the second mounting seat 663 have spiral grooves. The first mounting seat 64 is hinged to the top seat 3 via a fourth hinge shaft 63. The hinge shaft 66 is fixedly connected to or integrally formed with the two second mounting seats 663. One part of the tension spring 65 is wound in the groove of the first mounting seat 64, and the other part of the tension spring 65 is wound in the groove of the second mounting seat 663. The second mounting seats are fixedly connected to or integrally formed with the hinge shaft. The second mounting seat 663 is hinged to the base 1 via a fifth hinge shaft 67, which is located below the front of the tail seat 2. This design improves the stability of the telescopic component, facilitates chassis assembly, and allows for adjustment of the tension of the tension spring, enhancing the chassis's applicability and providing a better user experience. Furthermore, the fifth hinge shaft 67 can limit the forward tilt angle of the tail seat and prevent over-adjustment.

[0037] To prevent the hinged seat from shifting laterally, in this embodiment, as follows: Figure 2 , Figure 4 and Figure 5 As shown, the mounting cavity of the base 1 has two symmetrical first limiting parts 17 protruding from the left and right. The first limiting parts 17 are located in front of the first connecting part 12. The bottom of the hinge seat 66 has two second limiting parts protruding from it. The second limiting parts are provided with limiting grooves 665 with downward openings. The two first limiting parts 17 are respectively inserted into the limiting grooves of the two second limiting parts, so that the hinge seat 66 can only move in the longitudinal direction and avoids the hinge seat from moving laterally.

[0038] A chair using the aforementioned chassis includes the aforementioned top seat, base, and tail seat.

[0039] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 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] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A plastic self-loading chassis, comprising a base (1), a top seat (3), and a tail seat (2), wherein the base (1) and the tail seat (2) are hinged together by a first hinge shaft (4), and the top seat (3) and the tail seat (2) are hinged together by a second hinge shaft (5), characterized in that: The front part of the tailstock (2) is hinged to the front part of the top seat (3) via the second hinge shaft (5); it also includes a swing member (62) and a telescopic member. The bottom of the swing member (62) is hinged to the rear part of the base (1) via the third hinge shaft (61), and the top of the swing member (62) is hinged to the rear part of the top seat (3) via the fourth hinge shaft (63). The fourth hinge shaft (63) is connected to the base (1) via the telescopic member, thereby giving the swing member (62) a downward rotation tendency through the telescopic member. The fourth hinge shaft (63) is located behind the second hinge shaft (5); both the base (1) and the top seat (3) are made of plastic. The telescopic component is a tension spring (65), and the two ends of the tension spring (65) are connected to the fourth hinge shaft (63) and the base (1) respectively; With the first hinge axis as the fulcrum, the first hinge axis to the rear of the tailstock forms the first lever arm, and the first hinge axis to the second hinge axis forms the second lever arm; with the second hinge axis as the fulcrum, the second hinge axis to the fourth hinge axis forms the third lever arm; with the fourth hinge axis as the fulcrum, the fourth hinge axis to the third hinge axis forms the fourth lever arm; the user's back rests against the chair back, and the chair back, under force, drives the tailstock (2) to swing with the first hinge axis (4) as the fulcrum; when the tailstock (2) swings, the front of the tailstock (2) lifts the top seat (3) through the second hinge axis (5), causing the front of the top seat (3) to move backward and upward around the first hinge axis (4). When the top seat (3) moves, it pulls the swinging part (62) through the fourth hinge shaft (63), causing the swinging part (62) to swing backward around the third hinge shaft (61), and then stretches the telescopic part through the fourth hinge shaft (63). When the user leans forward or the user gets up, the telescopic part pulls the top seat and the swinging part (62) to reset through the fourth hinge shaft (63). The top seat (3) drives the tail seat (2) to reset through the second hinge shaft (5). When the tail seat (2) resets, it can drive the chair back to move with the user's back. During the adaptive adjustment process, the swing distance of the tail seat (2) gradually shortens through multiple hinge shafts connected in sequence.

2. The plastic self-loading chassis according to claim 1, characterized in that: The tailstock (2) includes two first connecting plates (22) on the left and right. The rear parts of the two first connecting plates (22) are fixedly connected by a second connecting plate (21). The two first connecting plates (22) extend forward. The first hinge shaft (4) respectively hinges the two first connecting plates (22) to the base (1). The front parts of the two first connecting plates (22) are hinged to the bottom of the top seat (3) by a second hinge shaft (5). The swing member (62) is located between the two first connecting plates (22).

3. The plastic self-loading chassis according to claim 2, characterized in that: The base (1) is also provided with two positioning grooves (14) extending backward and forward. The positioning grooves (14) extend backward and penetrate the base (1). The two first connecting plates (22) of the tailstock (2) are respectively inserted into the two positioning grooves (14) and are hinged to the base (1) through the first hinge shaft (4).

4. The plastic self-loading chassis according to claim 1, characterized in that: It also includes a first mounting base (64) and a second mounting base (663). Both the first mounting base (64) and the second mounting base (663) are provided with spiral grooves. The first mounting base (64) is sleeved on the fourth hinge shaft (63). The second mounting base (663) is hinged to the base (1). One end of the tension spring (65) is wrapped in the groove of the first mounting base (64), and the other end of the tension spring (65) is wrapped in the groove of the second mounting base (663).

5. A plastic self-loading chassis according to claim 4, characterized in that: The second mounting base (663) is hinged to the base (1) via the fifth hinge shaft (67), which is located below the front of the tailstock (2).

6. A plastic self-loading chassis according to claim 5, characterized in that: There are two tension springs (65), two first mounting bases (64) and two second mounting bases (663), and the two tension springs (65), two first mounting bases (64) and two second mounting bases (663) are arranged symmetrically on the left and right.

7. A plastic self-loading chassis according to claim 6, characterized in that: Both second mounting bases (663) are fixed on the hinge base (66), which is sleeved on the fifth hinge shaft (67).

8. A plastic self-loading chassis according to claim 7, characterized in that: The bottom of the hinge seat (66) is provided with a limiting groove (665), and the base (1) has a first limiting part (17) for preventing the hinge seat (66) from moving laterally. The first limiting part (17) is inserted into the limiting groove (665).

9. A chair, characterized in that: The invention includes a plastic self-loading chassis as described in any one of claims 1-8.

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