A bottom box structure applied to an office chair

Abstract

A bottom box structure applied to an office chair, comprising a base, a first rocker connecting piece, a connecting rod connecting piece and a second rocker connecting piece connected in sequence to form a four-bar linkage mechanism, a resilient connecting piece for automatically returning the first rocker connecting piece after movement, and a limiting piece for limiting the movement range of the second rocker connecting piece, the two ends of the resilient connecting piece are respectively hinged to a first movable hinge shaft and a second fixed hinge shaft, and the limiting piece is connected to the second rocker connecting piece, the bottom box structure of the present application forms a four-bar linkage structure by sequentially hinging the base, the first rocker connecting piece, the connecting rod connecting piece and the second rocker connecting piece, so that the back of the office chair can realize forward and backward rocking function, and the user can appropriately relieve stress and relax mood through the rocking activity of the back during work.

Description

Technical Field

[0001] This invention belongs to the field of chair furniture technology, specifically relating to a base box structure for use in office chairs. Background Technology

[0002] An office chair generally refers to a chair with a backrest used for desk work. People often experience fatigue and soreness during desk work because of certain shortcomings in existing office chairs. While traditional office chairs typically have a backrest installed in a base box for height and reclining adjustments, the backrest is usually locked in place. This means that the user's back doesn't get much movement during prolonged use, leading to fatigue and soreness. Given today's fast-paced lifestyle and high work pressure, there is a need for a chair with a base box that allows the backrest to rock, enabling users to relieve stress and relax during work breaks. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a base box structure for use in office chairs.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A base box structure for use in office chairs includes a base, a first rocker connector, a connecting rod connector, and a second rocker connector connected in sequence to form a four-bar linkage. The rear end of the base is hinged to the first rocker connector via a first fixed hinge axis. The first rocker connector is hinged to the connecting rod connector via a first movable hinge axis. The connecting rod connector is hinged to the second rocker connector via a second movable hinge axis. The second rocker connector is hinged to the front end of the base via a second fixed hinge axis. The structure also includes a spring-loaded connector for automatically resetting the first rocker connector after movement and a limiting member for limiting the range of motion of the second rocker connector. The two ends of the spring-loaded connector are respectively hinged to the first movable hinge axis and the second fixed hinge axis, and the limiting member is connected to the second rocker connector.

[0006] As a further improvement of the present invention, the elastic connector includes a connecting rod, a connecting head, a return spring, and an adjusting bolt for adjusting the initial elastic force of the return spring. The connecting rod has an adjusting cavity for inserting the return spring. The adjusting cavity has a movable head that can move within the adjusting cavity. One end of the adjusting bolt passes through the connecting head and enters the adjusting cavity, and is threadedly connected to the movable head. The other end of the adjusting bolt is fixed in the connecting head. One end of the return spring is fixed by the movable head, and the other end of the return spring is fixed to the end of the connecting rod.

[0007] As a further improvement of the present invention, the connecting rod is hinged to the first movable hinge shaft, and the connecting head is hinged to the second fixed hinge shaft.

[0008] As a further improvement of the present invention, the limiting member is provided with a plurality of limiting fulcrums for changing the range of motion of the second rocker arm connector, the plurality of limiting fulcrums having different protrusion heights, and the end of the second rocker arm connector extending to the limiting fulcrums.

[0009] As a further improvement of the present invention, the second rocker arm connector includes a second rocker arm movable sleeve portion connected to the second movable hinge shaft, a second rocker arm fixed sleeve portion connected to the second fixed hinge shaft, a second rocker arm limiting end portion movably connected to the limiting fulcrum, a second rocker arm connecting rod connected between the second rocker arm movable sleeve portion and the second rocker arm fixed sleeve portion, and a second rocker arm limiting rod connected between the second rocker arm fixed sleeve portion and the second rocker arm limiting end.

[0010] As a further improvement of the present invention, the limiting member is connected to a rotating handle for rotating the limiting member. One end of the rotating handle is connected to the limiting member, and the other end of the rotating handle extends to the outside of the base. The rotating handle is used to switch different limiting fulcrums to cooperate with the second rocker arm connector.

[0011] As a further improvement of the present invention, the first rocker arm connector is connected to the chair back frame, and the connecting rod connector is connected to the chair seat frame.

[0012] As a further improvement of the present invention, the connecting rod is integrally formed with the chair frame, and the connecting rod is disposed at the bottom of the chair frame.

[0013] As a further improvement of the present invention, the chair frame is provided with a balance connecting plate, the balance connecting plate is connected to the second rocker arm connector through a bridge plate, one end of the bridge plate is connected to the bottom of the balance connecting plate, and the other end of the bridge plate is connected to the front end of the second rocker arm connector.

[0014] As a further improvement of the present invention, the balance connecting plate is disposed at the front end of the connecting rod connector, one end of the balance connecting plate near the connecting rod connector is connected to the upper surface of the chair frame, and the other end of the balance connecting plate is connected to the lower surface of the chair frame.

[0015] The beneficial effects of this invention are as follows: The base box structure of this invention forms a four-bar linkage structure by sequentially hinged the base, the first rocker arm connector, the connecting rod connector, and the second rocker arm connector, thereby enabling the backrest of the office chair to rock back and forth. Users can relieve stress and relax by rocking the backrest during breaks from work. Simultaneously, an elastic connector is provided in the base box structure so that the backrest can automatically return to its original position under the action of elasticity after rocking backward. The initial elasticity of the elastic connector is adjustable, allowing the degree of rocking to be adjusted. Furthermore, a limiting component is provided in the base box structure to limit the amplitude of the backrest rocking, allowing users to adjust the amplitude of the backrest rocking according to their own needs, thus making it highly adaptable. Attached Figure Description

[0016] Figure 1 This is a perspective view of the installation of the base box, seat frame, and backrest frame in this embodiment;

[0017] Figure 2 This is a side view of the installation of the base box, seat frame, and backrest frame in this embodiment.

[0018] Figure 3 for Figure 1 Exploded view;

[0019] Figure 4 This is a simplified diagram illustrating the connection principle of the bottom box in this embodiment;

[0020] Figure 5 This is an exploded view of the bottom box in this embodiment;

[0021] Figure 6 This is a schematic diagram of the internal structure of the elastic connector in this embodiment;

[0022] Figure 7 This is a schematic diagram of the limiting component in this embodiment;

[0023] Figure 8 This is a perspective view of the second rocker arm connector in this embodiment. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] Example:

[0026] like Figures 1 to 8As shown, this embodiment discloses a base box structure for use in an office chair, including a base 1, a first rocker arm connector 2, a connecting rod connector 3, and a second rocker arm connector 4 connected sequentially to form a four-bar linkage. The rear end of the base 1 is hinged to the first rocker arm connector 2 via a first fixed hinge shaft 5. The first rocker arm connector 2 is hinged to the connecting rod connector 3 via a first movable hinge shaft 6. The connecting rod connector 3 is hinged to the second rocker arm connector 4 via a second movable hinge shaft 7. The second rocker arm connector 4 is hinged to the front end of the base 1 via a second fixed hinge shaft 8. The structure also includes a spring-loaded connector 9 for automatically resetting the first rocker arm connector 2 after movement and a limiting member 10 for limiting the range of motion of the second rocker arm connector 4. The two ends of the spring-loaded connector 9 are respectively hinged to the first movable hinge shaft 6 and the second fixed hinge shaft 8, and the limiting member 10 is connected to the second rocker arm connector 4. In this embodiment, the first rocker arm connector 2 is connected to the chair back frame 13, and the connecting rod connector 3 is connected to the chair seat frame 12. The connecting rod connector 3 is integrally formed with the seat frame 12. The connecting rod connector 3 is located at the bottom of the seat frame 12. In practical applications, the connecting rod connector 3 and the seat frame 12 can also be a separate structure, which has the same technical effect as the integral structure of this embodiment. In this embodiment, the first rocker arm connector 2 and the backrest frame 13 are separate structures. In practical applications, the first rocker arm connector 2 and the backrest frame 13 can also be set as an integral structure, which has the same technical effect as the separate structure of this embodiment. Manufacturers can choose an integral structure or a separate structure according to the structural principle of this invention, and both can achieve the working principle of this invention. During the installation of the office chair, the backrest and seat are formed by setting the backrest and seat cushion on the backrest frame 13 and the seat frame 12 respectively. The chair legs are then installed at the bottom of the base box to form the entire office chair. In use, the user leans against the chair back, causing it to swing backward. The chair back frame 13 drives the first rocker arm connector 2 to rotate clockwise around the first fixed hinge axis 5. The first rocker arm connector 2 drives the connecting rod connector 3 to move backward, while the elastic connector 9 is compressed, generating elastic potential energy. The connecting rod connector 3 drives the second rocker arm connector 4 to rotate clockwise around the second fixed hinge axis 8. The second rocker arm connector 4 rotates to the limit member 10 and stops, stopping the backward swing of the chair back. When the user leans forward, their back moves away from the chair back. Under the elastic reset action of the elastic connector 9, the chair back automatically swings forward and resets with the user's back. At this time, the first rocker arm connector 2 rotates counterclockwise around the first fixed hinge axis 5 to reset, the connecting rod connector 3 moves forward to reset, and the second rocker arm connector 4 rotates counterclockwise around the second fixed hinge axis 8 to reset. The limiting relationship between the second rocker arm connector 4 and the limit member 10 is released.

[0027] In a preferred embodiment, to enable the elastic connector 9 to have an adjustable initial elastic force, allowing the user to adjust the force required for the chair back to rock, i.e., the degree of chair back rocking tension, the structure of the elastic connector 9 is configured as follows: The elastic connector 9 includes a connecting rod 91, a connecting head 92, a return spring 93, and an adjusting bolt 94 for adjusting the initial elastic force of the return spring 93. The connecting rod 91 has an adjusting cavity 95 for housing the return spring 93. The adjusting cavity 95 has a movable head 96 that can move within the adjusting cavity 95. One end of the adjusting bolt 94 passes through the connecting head 92 into the adjusting cavity 95 and is threadedly connected to the movable head 96. The other end of the adjusting bolt 94 is fixed in the connecting head 92. One end of the return spring 93 is fixed by the movable head 96, and the other end of the return spring 93 is fixed to the end of the connecting rod 91 near the connecting head 92. The connecting rod 91 is hinged to the first movable hinge shaft 6, and the connecting head 92 is hinged to the second fixed hinge shaft 8. The user can adjust the extension of the return spring 93 by turning the adjusting bolt 94, causing the moving head 96 to move within the adjusting cavity 95, thus changing the initial elastic force of the elastic connector 9. When the user turns the adjusting bolt 94, moving the moving head 96 closer to the connector 92, the return spring 93 is compressed, increasing the initial elastic force of the elastic connector 9. When the user leans back against the chair back, the chair back swings backward, requiring the compression of the return spring 93. In this case, the user needs to apply more force to make the chair back swing backward, and the restoring force of the elastic connector 9 is also greater. Conversely, when the user turns the adjusting bolt 94 in the opposite direction, the moving head 96 moves away from the connector 92, stretching the return spring 93 and decreasing the initial elastic force of the elastic connector 9. When the user leans back against the chair back, the chair back swings backward, requiring the compression of the return spring 93. In this case, the user needs to apply less force to make the chair back swing backward, and the restoring force of the elastic connector 9 is also smaller. This allows for adjustment of the chair back's rocking tension.

[0028] In a preferred embodiment, the limiting member 10 is provided with a plurality of limiting fulcrums 101 for changing the range of motion of the second rocker arm connector 4. The plurality of limiting fulcrums 101 have different protrusion heights. The end of the second rocker arm connector 4 extends to the limiting fulcrums 101. In the initial state, the distance between the end of the second rocker arm connector 4 and the limiting fulcrums 101 determines the swing amplitude of the second rocker arm. When the distance between the end of the second rocker arm connector 4 and the limiting fulcrums 101 is large, the second rocker arm connector 4 has a large swing amplitude, and the corresponding chair back also has a large swing amplitude, and the chair back can swing within a large angle range. Conversely, when the distance between the end of the second rocker arm connector 4 and the limiting fulcrums 101 is small, the smaller swing angle of the second rocker arm connector 4 is limited by the limiting fulcrums 101, so the swing amplitude is small, and the corresponding chair back can only swing within a small angle range. In this embodiment, the second rocker arm connector 4 includes a second rocker arm movable sleeve 41 connected to the second movable hinge shaft 7, a second rocker arm fixed sleeve 42 connected to the second fixed hinge shaft 8, a second rocker arm limiting end 43 movably connected to the limiting fulcrum 101, a second rocker arm connecting rod 44 connecting the second rocker arm movable sleeve 41 and the second rocker arm fixed sleeve 42, and a second rocker arm limiting rod 45 connecting the second rocker arm fixed sleeve 42 and the second rocker arm limiting end 43. The limiting member 10 is connected to a rotating handle 11 for rotating the limiting member 10. One end of the rotating handle 11 is connected to the limiting member 10, and the other end of the rotating handle 11 extends to the outside of the base 1. The rotating handle 11 is used to switch between different limiting fulcrums 101 and the second rocker arm connector 4. By rotating the handle 11, the limiting member 10 is rotated, causing the limiting fulcrum 101 with different protrusion heights in the limiting member 10 to rotate to the position that cooperates with the second rocker arm connector 4, thereby realizing the backrest swinging within different amplitude ranges and achieving multi-level adjustment.

[0029] In a preferred embodiment, in order to keep the seat balanced during the backrest rocking process and provide the user with better riding comfort, the seat frame 12 is provided with a balance connecting plate 14. The balance connecting plate 14 is connected to the second rocker arm connector 4 through a bridge plate 15. One end of the bridge plate 15 is connected to the bottom of the balance connecting plate 14, and the other end of the bridge plate 15 is connected to the front end of the second rocker arm connector 4. The balance connecting plate 14 is disposed at the front end of the connecting rod connector 3. One end of the balance connecting plate 14 near the connecting rod connector 3 is connected to the upper surface of the seat frame 12, and the other end of the balance connecting plate 14 is connected to the lower surface of the seat frame 12, thereby forming an interlaced installation structure, which makes the force distribution of the balance connecting plate 14 more reasonable. When the chair back swings backward, the position where the balance connecting plate 14 is connected to the upper surface of the seat frame 12 has an upward thrust. By connecting the end of the balance connecting plate 14 near the connecting rod connector 3 to the upper surface of the seat frame 12, the balance connecting plate 14 also has an upward pull force that pulls the seat frame 12. The combined force of the two makes the movement of the seat frame 12 easier. Similarly, the same structural principle is used in the installation of the other end of the balance connecting plate 14, making the chair frame 12 move more effortlessly and the structure more reasonable. Since the chair frame 12 is hinged to the base box through the connecting rod connector 3, it will move with the backrest during the rocking motion. By using the balance connecting plate 14 and the bridge plate 15 to connect the chair frame 12 and the base box, a multi-point connection structure is formed, making the chair frame 12 more stable during the movement.

[0030] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. A bottom box structure applied to an office chair, characterized in that: The four-bar linkage mechanism comprises a base (1), a first rocker connecting piece (2), a connecting rod connecting piece (3) and a second rocker connecting piece (4) connected in sequence, the rear end of the base (1) is hinged to the first rocker connecting piece (2) through a first fixed hinge shaft (5), the first rocker connecting piece (2) is hinged to the connecting rod connecting piece (3) through a first movable hinge shaft (6), the connecting rod connecting piece (3) is hinged to the second rocker connecting piece (4) through a second movable hinge shaft (7), the second rocker connecting piece (4) is hinged to the front end of the base (1) through a second fixed hinge shaft (8), and the four-bar linkage mechanism further comprises a spring connecting piece (9) for automatically returning the first rocker connecting piece (2) after movement and a limiting piece (10) for limiting the movement range of the second rocker connecting piece (4), the two ends of the spring connecting piece (9) are hinged to the first movable hinge shaft (6) and the second fixed hinge shaft (8) respectively, and the limiting piece (10) is connected to the second rocker connecting piece (4). The spring connecting piece (9) comprises a connecting rod (91), a connecting head (92), a reset spring (93) and an adjusting bolt (94) for adjusting the initial elasticity of the reset spring (93), the connecting rod (91) is internally provided with an adjusting cavity (95) for accommodating the reset spring (93), the adjusting cavity (95) is internally provided with a movable head (96) which can move in the adjusting cavity (95), one end of the adjusting bolt (94) penetrates into the adjusting cavity (95) through the connecting head (92) and is threadedly connected with the movable head (96), the other end of the adjusting bolt (94) is fixed in the connecting head (92), one end of the reset spring (93) is fixed through the movable head (96), and the other end of the reset spring (93) is fixed at the end of the connecting rod (91). The first rocker connecting piece (2) is connected to a back frame (13), and the connecting rod connecting piece (3) is connected to a seat frame (12); the connecting rod connecting piece (3) is integrally formed with the seat frame (12), and the connecting rod connecting piece (3) is arranged at the bottom of the seat frame (12); a balance connecting plate (14) is arranged in the seat frame (12), the balance connecting plate (14) is connected to the second rocker connecting piece (4) through a bridging plate (15), one end of the bridging plate (15) is connected to the bottom of the balance connecting plate (14), and the other end of the bridging plate (15) is connected to the front end of the second rocker connecting piece (4); the balance connecting plate (14) is arranged at the front end of the connecting rod connecting piece (3), one end of the balance connecting plate (14) close to the connecting rod connecting piece (3) is connected to the upper surface of the seat frame (12), and the other end of the balance connecting plate (14) is connected to the lower surface of the seat frame (12); when the back of the chair is swung backward, the position where the balance connecting plate (14) is connected to the upper surface of the seat frame (12) has an upward pushing force, and the balance connecting plate (14) also has an upward pulling force for pulling the seat frame (12).

2. The bottom box structure applied to an office chair according to claim 1, characterized in that: The connecting rod (91) is hinged to the first movable hinge shaft (6), and the connecting head (92) is hinged to the second fixed hinge shaft (8).

3. The bottom box structure applied to an office chair according to claim 1, characterized in that: The limiting piece (10) is provided with a plurality of limiting fulcrums (101) for changing the range of movement of the second rocker connecting piece (4), the plurality of limiting fulcrums (101) have different protrusion heights, and the end of the second rocker connecting piece (4) extends to the limiting fulcrum (101).

4. The bottom box structure applied to an office chair according to claim 3, characterized in that: The second rocker connecting piece (4) comprises a second rocker movable shaft sleeve part (41) connected with the second movable hinge shaft (7), a second rocker fixed shaft sleeve part (42) connected with the second fixed hinge shaft (8), a second rocker limiting end (43) movably connected with the limiting fulcrum (101), a second rocker connecting rod (44) connected between the second rocker movable shaft sleeve part (41) and the second rocker fixed shaft sleeve part (42), and a second rocker limiting rod (45) connected between the second rocker fixed shaft sleeve part (42) and the second rocker limiting end (43).

5. The bottom box structure applied to an office chair according to claim 3, characterized in that: The limiting piece (10) is connected with a rotating handle (11) for rotating the limiting piece (10), one end of the rotating handle (11) is connected with the limiting piece (10), the other end of the rotating handle (11) extends to the outside of the base (1), and the rotating handle (11) is used for switching different limiting fulcrums (101) to cooperate with the second rocker connecting piece (4).

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