Anti-rollover chair

Abstract

The utility model relates to an anti-rollover chair. The anti-rollover chair comprises a backrest, a cushion assembly, a chair rod and a chair leg assembly, the chair leg assembly is arranged at the bottom of the chair rod; the backrest and the cushion assembly are arranged on the chair rod, the cushion assembly is arranged below the backrest in the length direction of the chair rod, and the cushion assembly and the backrest are arranged on the same side of the chair rod; the chair leg assembly comprises a chair leg steel plate, a safety sleeve and a chair leg plastic part; the chair leg steel plate is assembled on the chair leg plastic part through the connecting bolt, the chair leg steel plate is rigidly connected with the safety sleeve, and the chair rod is inserted from the safety sleeve until the lower end surface is in contact with the chair leg steel plate; wherein the connecting bolt penetrates through a first through hole of the chair leg steel plate and is connected with a threaded hole in the lower end of the chair rod; the cushion assembly is arranged on the chair rod through a locking device and can be adjusted up and down in the length direction of the chair rod. The stability of the chair under strong impact is ensured, toppling or rollover caused by loose connection between the chair rod and the chair leg assembly is reduced, the cushion assembly can be adjusted to adapt to different heights, and a correct sitting posture can be maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to a chair that prevents tipping over. Background Art

[0002] Children's adjustable study chairs are widely used because they can meet the ergonomic needs of school-age children. They can not only assist in adjusting the learning posture suitable for children, but also effectively prevent myopia, and are deeply recognized by parents. A high-quality study chair should have the following characteristics: both the backrest and the seat cushion can be adjusted forward and backward, up and down, to adapt to children of different heights. However, since each component needs to be adjusted, the adjustment mechanisms of many study chairs are relatively complex and not easy for parents and children to operate. Moreover, during the up and down adjustment of the seat cushion, the stability of the connection between the chair rod and the chair feet will be affected, resulting in tipping over.

[0003] In order to solve the above problems, a chair that prevents tipping over is designed.

[0004] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model

[0005] The present utility model provides a chair that prevents tipping over, thus effectively solving the problems in the background art.

[0006] In order to achieve the above object, the technical solution adopted by the present utility model is: a chair that prevents tipping over, comprising: a backrest, a seat cushion assembly, a chair rod and a chair foot assembly;

[0007] The chair foot assembly is fixedly arranged at the bottom of the chair rod;

[0008] The backrest and the seat cushion assembly are arranged on the chair rod, and along the length direction of the chair rod, the seat cushion assembly is arranged below the backrest, and the seat cushion assembly and the backrest are arranged on the same side of the chair rod;

[0009] The chair foot assembly includes a chair foot steel plate, a safety sleeve and a chair foot plastic part;

[0010] The chair foot steel plate is assembled on the chair foot plastic part through a connecting bolt, the chair foot steel plate is rigidly connected with the safety sleeve, and the chair rod is inserted into the safety sleeve until the lower end surface contacts the chair foot steel plate;

[0011] Wherein, the connecting bolt passes through the first through hole of the chair foot steel plate and is connected with the threaded hole inside the lower end of the chair rod;

[0012] The seat cushion assembly is arranged on the chair rod through a locking device and can be adjusted up and down along the length direction of the chair rod.

[0013] Further, the locking device includes a knob mechanism, a locking handle, a clamping sleeve, a long pin shaft, a locking bolt and a C-shaped connector;

[0014] The knob mechanism passes through the left half of the clamping sleeve;

[0015] The C-shaped connector passes through the rectangular hole at the tail of the clamping sleeve and connects the left half and the right half of the clamping sleeve;

[0016] The locking bolt passes through the second through hole of the locking handle and the third through hole of the C-shaped connector to fix the locking handle and the C-shaped connector on the clamping sleeve;

[0017] The locking bolt is connected with the long pin shaft.

[0018] Further, the connection part between the locking handle and the C-shaped connector is set to be cam-shaped;

[0019] When the locking handle is opened, the opening position of the clamping sleeve becomes larger to H1;

[0020] When the locking handle is closed, the opening position of the clamping sleeve becomes smaller to H2.

[0021] Further, the knob mechanism includes a knob handle, a threaded metal sleeve, a return spring and a fixing pin;

[0022] The return spring sleeve is arranged on the stop section at the top of the fixing pin, and the return spring and the fixing pin are integrally arranged in the threaded metal sleeve;

[0023] Wherein, the hexagonal hole inside the threaded metal sleeve is smaller than the diameter of the return spring;

[0024] The hexagonal hole inside the threaded metal sleeve is larger than the diameter of the fixing pin;

[0025] Wherein, the fixing pin passes through the threaded metal sleeve and the knob handle to strengthen the fixation.

[0026] Further, the hexagonal hole of the threaded metal sleeve and the hexagonal end face of the knob handle cooperate with each other;

[0027] When the hexagonal hole and the hexagonal end face cooperate, rotate the knob handle, and the threaded metal sleeve rotates accordingly;

[0028] When the hexagonal hole does not match the hexagonal end face, the fixing pin retracts into the threaded metal sleeve, and the return spring is compressed.

[0029] Further, when the locking handle is opened, the knob handle is pulled outwards at the same time, the fixing pin retracts into the threaded metal sleeve, and the inside of the clamping round sleeve opens. At this time, the height of the seat cushion assembly can be adjusted.

[0030] Further, when the knob handle is loosened, the return spring will automatically eject the fixing pin, and the fixing pin will insert into the side hole of the chair rod to prevent the seat cushion assembly from descending;

[0031] Wherein, when the locking handle is closed, the opening position of the clamping round sleeve becomes smaller to H2, and the seat cushion assembly is firmly fixed on the chair rod.

[0032] Further, a plurality of rollers are provided at the bottom of the chair leg plastic part.

[0033] The beneficial effects of the present utility model are as follows: The chair leg steel plate is assembled on the chair leg plastic part through some connecting bolts and is rigidly connected with the safety sleeve. The chair rod is inserted into the safety sleeve until the lower end face contacts the chair leg steel plate. And some connecting bolts are connected with the threaded holes inside the lower end of the chair rod through the first through holes of the chair leg steel plate. When the seat cushion assembly is subjected to a great force, even if the connecting bolts come loose, the chair rod can still be held by the safety sleeve to prevent it from coming out of the chair leg assembly, ensuring the stability of the chair when it is subjected to a strong impact, reducing the risk of tipping or side flipping caused by the loose connection between the chair rod and the chair leg assembly, and the adjustable seat cushion assembly allows adapting to users of different heights, especially growing children, which is more helpful for maintaining the correct sitting posture and preventing physical problems caused by bad sitting postures. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0035] Figure 1 Schematic structural diagram of an anti-tipping chair;

[0036] Figure 2 Schematic diagram of the bottom connection when the chair rod and the chair leg assembly are stressed;

[0037] Figure 3 Schematic structural diagram of the seat cushion assembly and the locking device;

[0038] Figure 4 Schematic structural diagram of the chair leg assembly;

[0039] Figure 5 Schematic diagram of the connection between the chair rod and the chair leg assembly;

[0040] Figure 6 Schematic structural diagram of the knob mechanism;

[0041] Figure 7 Cross-sectional view of the knob mechanism when pulled out;

[0042] Figure 8 Cross-sectional view of the knob mechanism when reset;

[0043] Figure 9 Schematic diagram of the opening of the clamping sleeve when the locking handle is opened;

[0044] Figure 10 Schematic diagram of the opening of the clamping sleeve when the locking handle is closed;

[0045] Reference numerals: 1, backrest; 2, seat cushion assembly; 3, chair rod; 31, threaded hole; 32, side hole; 4, chair leg assembly; 41, chair leg steel plate; 411, first through hole; 42, safety sleeve; 43, chair leg plastic part; 431, roller; 5, connecting bolt; 6, locking device; 61, knob mechanism; 611, knob handle; 611A, hexagonal end face; 612, threaded metal sleeve; 612A, hexagonal hole; 613, return spring; 614, fixing pin; 614A, stop section; 62, locking handle; 621, second through hole; 63, clamping sleeve; 631, rectangular hole; 64, long pin shaft; 65, locking bolt; 66, C-shaped connector; 661, third through hole. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0048] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] As Figures 1 to 10 shown, an anti - tipping chair includes: a backrest 1, a seat cushion assembly 2, a chair rod 3, and a chair leg assembly 4;

[0050] The chair leg assembly 4 is fixedly arranged at the bottom of the chair rod 3;

[0051] The backrest 1 and the seat cushion assembly 2 are arranged on the chair rod 3, and along the length direction of the chair rod 3, the seat cushion assembly 2 is arranged below the backrest 1, and the seat cushion assembly 2 and the backrest 1 are arranged on the same side of the chair rod 3;

[0052] The chair leg assembly 4 includes a chair leg steel plate 41, a safety sleeve 42, and a chair leg plastic part 43;

[0053] The chair leg steel plate 41 is assembled on the chair leg plastic part 43 through a connecting bolt 5, the chair leg steel plate 41 is rigidly connected to the safety sleeve 42, and the chair rod 3 is inserted into the safety sleeve 42 until the lower end surface contacts the chair leg steel plate 41;

[0054] Wherein, the connecting bolt 5 passes through the first through - hole 411 of the chair leg steel plate 41 and is connected to the threaded hole 31 inside the lower end of the chair rod 3;

[0055] The seat cushion assembly 2 is arranged on the chair rod 3 through a locking device 6 and can be adjusted up and down along the length direction of the chair rod 3.

[0056] The chair leg steel plate 41 is assembled on the chair leg plastic part 43 through some connecting bolts 5 and is rigidly connected to the safety sleeve 42. The chair rod 3 is inserted into the safety sleeve 42 until the lower end surface contacts the chair leg steel plate 41, and some connecting bolts 5 are connected to the threaded hole 31 inside the lower end of the chair rod 3 through the first through - hole 411 of the chair leg steel plate 41. When the seat cushion assembly 2 is subjected to a great force, even if the connecting bolt 5 becomes loose, the chair rod 3 can still be held by the safety sleeve 42, preventing it from disengaging from the chair leg assembly 4, ensuring the stability of the chair when subjected to a strong impact, reducing the risk of tipping or rolling over caused by the loose connection between the chair rod 3 and the chair leg assembly 4, and the adjustable seat cushion assembly 2 allows it to adapt to users of different heights, especially growing children, which is more helpful for maintaining a correct sitting posture and preventing physical problems caused by poor sitting postures.

[0057] Preferably, as in the above embodiments, the locking device 6 includes a knob mechanism 61, a locking handle 62, a clamping sleeve 63, a long pin shaft 64, a locking bolt 65 and a C-shaped connector 66;

[0058] The knob mechanism 61 passes through the left half of the clamping sleeve 63;

[0059] The C-shaped connector 66 passes through the rectangular hole 631 at the tail of the clamping sleeve 63 to connect the left half and the right half of the clamping sleeve 63;

[0060] The locking bolt 65 passes through the second through hole 621 of the locking handle 62 and the third through hole 661 of the C-shaped connector 66 to fix the locking handle 62 and the C-shaped connector 66 on the clamping sleeve 63;

[0061] The locking bolt 65 is connected to the long pin shaft 64.

[0062] Through the locking device 6, the chair realizes the safe and flexible adjustment of the seat cushion assembly 2; the knob mechanism 61 passes through the left half of the clamping sleeve 63, making the adjustment operation simple and direct; the C-shaped connector 66 provides firm support and overall stability for the clamping sleeve 63 by passing through the rectangular hole 631 at the tail of the clamping sleeve 63 and connecting the left half and the right half of the clamping sleeve 63; the locking bolt 65 is connected through the second through hole 621 of the locking handle 62 and the third through hole 661 of the C-shaped connector 66, further fixing the positions of the locking handle 62 and the C-shaped connector 66 on the clamping sleeve 63, ensuring the reliability and durability of the locking mechanism; the connection between the locking bolt 65 and the long pin shaft 64 enhances the structural integrity of the entire locking device 6, enabling the user to adjust the height of the seat cushion assembly 2 as needed while maintaining the stability of the seat cushion during use, not only enhancing the safety of the chair but also improving its flexibility to adapt to the needs of different users, especially to the body shape changes of children at different growth stages.

[0063] In this embodiment, the connection between the locking handle 62 and the C-shaped connector 66 is set to be cam-shaped;

[0064] When the locking handle 62 is opened, the opening position of the clamping sleeve 63 becomes larger to H1;

[0065] When the locking handle 62 is closed, the opening position of the clamping sleeve 63 becomes smaller to H2.

[0066] The connection between the locking handle 62 and the C-type connector 66 is designed as a cam-shaped structure, and the opening position of the holding sleeve 63 is flexibly adjusted according to the state of the locking handle 62. When the locking handle 62 is opened, the opening position of the holding sleeve 63 is expanded to H1, so that the user can adjust the height of the cushion assembly 2 or make other necessary position adjustments; when the locking handle 62 is closed, the opening position of the holding sleeve 63 is retracted to H2, ensuring the fixation and stability of the cushion assembly 2 during use, preventing the cushion from accidentally moving or slipping during use, thereby greatly increasing the safety and reliability of use. In addition, the cam-shaped design makes the operation smoother, and the user can easily make quick adjustments, which enhances the user-friendliness and practicality of the chair.

[0067] In this embodiment, the knob mechanism 61 includes a knob handle 611, a threaded metal sleeve 612, a return spring 613 and a fixing pin 614;

[0068] The return spring 613 is sleeved on the stop section 614A at the top of the fixing pin 614, and the return spring 613 and the fixing pin 614 are integrally arranged in the threaded metal sleeve 612;

[0069] The hexagonal hole 612A inside the threaded metal sleeve 612 is smaller than the diameter of the return spring 613;

[0070] The hexagonal hole 612A inside the threaded metal sleeve 612 is larger than the diameter of the fixing pin 614;

[0071] The fixing pin 614 passes through the threaded metal sleeve 612 and the knob handle 611 to strengthen the fixation.

[0072] The knob mechanism 61 includes a knob handle 611, a threaded metal sleeve 612, a return spring 613 and a fixing pin 614. The return spring 613 is installed on the stop segment 614A at the top of the fixing pin 614, and is integrally arranged in the threaded metal sleeve 612 together with the fixing pin 614, ensuring the overall stability and elastic feedback. The design of the interior of the threaded metal sleeve 612 takes into account precise size matching. The size of the hexagonal hole 612A is smaller than the diameter of the return spring 613 and larger than the diameter of the fixing pin 614. The difference ensures that the fixing pin 614 can pass through smoothly while the return spring 613 is slightly compressed, providing the necessary elastic force to support the operation of the knob handle 611, so that the knob handle 611 can achieve a smooth and accurate adjustment function during operation. At the same time, the connection between the fixing pin 614 passing through the threaded metal sleeve 612 and the knob handle 611 strengthens the overall fixity, so that the user can feel smooth and stable feedback when adjusting the knob, thereby improving the comfort of operation and the accuracy of adjustment.

[0073] In this embodiment, the hexagonal hole 612A of the threaded metal sleeve 612 cooperates with the hexagonal end face 611A of the knob handle 611;

[0074] When the hexagonal hole 612A cooperates with the hexagonal end face 611A, rotating the knob handle 611 causes the threaded metal sleeve 612 to rotate accordingly;

[0075] When the hexagonal hole 612A does not cooperate with the hexagonal end face 611A, the fixing pin 614 retracts into the threaded metal sleeve 612, and the return spring 613 is compressed.

[0076] The operation of the knob mechanism 61 depends on the precise cooperation between the threaded metal sleeve 612 and the knob handle 611. When the hexagonal hole 612A of the threaded metal sleeve 612 cooperates with the hexagonal end face 611A of the knob handle 611, the user can directly drive the threaded metal sleeve 612 to rotate by rotating the knob handle 611, thereby realizing the function adjustment of the knob, operating in an intuitive manner, increasing the precision and convenience of mechanical operation; when the hexagonal hole 612A does not cooperate with the hexagonal end face 611A, the fixing pin 614 will retract into the threaded metal sleeve 612, and at this time the return spring 613 is compressed, providing an automatic return function for the knob, ensuring the reset and stability after operation, not only improving the flexibility and response speed of the operation, but also increasing the durability and reliability, making the knob mechanism 61 smoother in daily use and reducing the loss or failure caused by improper operation.

[0077] In this embodiment, when the locking handle 62 is opened, the knob handle 611 is pulled outwards at the same time, the fixing pin 614 retracts into the threaded metal sleeve 612, and the inside of the clamping round sleeve 63 opens, and at this time the seat cushion assembly 2 can be height-adjusted.

[0078] When the locking handle 62 is opened, by pulling out the knob handle 611, the fixing pin 614 retracts into the threaded metal sleeve 612, and the inside of the clamping round sleeve 63 opens, thereby releasing the previous fixation on the chair rod 3, and the seat cushion assembly 2 can be easily height-adjusted along the chair rod 3, enabling the user to quickly adjust the height of the seat cushion according to their own needs or height, enhancing the adaptability and comfort of the chair, increasing the functionality of the chair, making the adjustment process fast and safe, meeting the usage needs of different users, and being able to quickly adapt to the body types of different users.

[0079] In this embodiment, when the knob handle 611 is loosened, the return spring 613 will automatically eject the fixing pin 614, and the fixing pin 614 will insert into the side hole 32 of the chair rod 3 to prevent the seat cushion assembly 2 from descending;

[0080] Among them, when the locking handle 62 is closed, the opening position of the clamping round sleeve 63 becomes smaller to H2, and the seat cushion assembly 2 is firmly fixed on the chair rod 3.

[0081] The knob handle 611 and the locking handle 62 work together to ensure the stability of the seat cushion assembly 2 and the safety of the user. When the knob handle 611 is loosened, the return spring 613 drives the fixed pin 614 to automatically pop out and insert into the side hole 32 of the chair rod 3, effectively preventing the unintentional descent of the seat cushion assembly 2 and keeping the set height unchanged. At the same time, when the locking handle 62 is closed, the opening position of the clamping sleeve 63 is reduced to H2, further strengthening the fixation of the seat cushion assembly 2 on the chair rod 3. This not only increases the functionality of the chair by providing a convenient adjustment mechanism but also greatly improves the safety during use.

[0082] In this embodiment, a plurality of rollers 431 are provided at the bottom of the chair foot plastic part 43.

[0083] The plurality of rollers 431 configured at the bottom of the chair foot plastic part 43 improve the mobility and flexibility of the chair, allowing the user to easily move the chair on various surfaces without worrying about damage to the floor or the need to use excessive force. The addition of the rollers 431 makes the chair particularly suitable for environments where frequent position adjustment is required, such as offices, classrooms, or meeting rooms, providing convenience for the user. At the same time, this mobility also makes it easier and more efficient to clean and maintain the space because the chair can be quickly moved from one location to another without hindering the floor cleaning work.

[0084] Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed for the present utility model is defined by the appended claims and their equivalents.

Claims

1. A rollover-resistant chair, characterized in that: include: Backrest, seat cushion assembly, chair rod and chair foot assembly; The chair foot assembly is fixedly arranged at the bottom of the chair rod; The backrest and the seat cushion assembly are arranged on the chair rod, and along the length direction of the chair rod, the seat cushion assembly is arranged below the backrest, and the seat cushion assembly and the backrest are arranged on the same side of the chair rod; The chair foot assembly includes a chair foot steel plate, a safety sleeve and a chair foot plastic part; The chair foot steel plate is assembled on the chair foot plastic part by connecting bolts, the chair foot steel plate is rigidly connected to the safety sleeve, and the chair rod is inserted into the safety sleeve until the lower end surface contacts the chair foot steel plate; Wherein, the connecting bolt passes through the first through hole of the chair foot steel plate and is connected with the threaded hole inside the lower end of the chair rod; The seat cushion assembly is arranged on the chair rod through a locking device and can be adjusted up and down along the length direction of the chair rod.

2. The anti-rollover chair according to claim 1, characterized in that: The locking device includes a knob mechanism, a locking handle, a locking sleeve, a long pin, a locking bolt and a C-type connector; The knob mechanism passes through the left half of the clamping sleeve; The C-type connector passes through the rectangular hole at the rear of the clamping sleeve to connect the left half and the right half of the clamping sleeve; The locking bolt passes through the second through hole of the locking handle and the third through hole of the C-type connector to fix the locking handle and the C-type connector on the clamping sleeve; The locking bolt is connected to the long pin.

3. The anti-rollover chair according to claim 2, characterized in that: The connection between the locking handle and the C-type connector is configured in a cam shape; When the locking handle is opened, the opening position of the clamping sleeve becomes larger to H1; When the locking handle is closed, the opening position of the clamping sleeve becomes smaller to H2.

4. The anti-rollover chair according to claim 2, characterized in that: The knob mechanism includes a knob handle, a threaded metal sleeve, a return spring and a fixing pin; The return spring sleeve is arranged on the stop section at the top end of the fixing pin, and the return spring and the fixing pin are integrally arranged in the threaded metal sleeve; Wherein, the hexagonal hole inside the threaded metal sleeve is smaller than the diameter of the return spring; The hexagonal hole inside the threaded metal sleeve is larger than the diameter of the fixing pin; Wherein, the fixing pin passes through the threaded metal sleeve and the knob handle to strengthen the fixation.

5. The anti-rollover chair according to claim 4, characterized in that: The hexagonal hole of the threaded metal sleeve cooperates with the hexagonal end surface of the knob handle; When the hexagonal hole is matched with the hexagonal end surface, the knob handle is rotated, and the threaded metal sleeve rotates accordingly; When the hexagonal hole does not match the hexagonal end face, the fixing pin is retracted into the threaded metal sleeve and the return spring is compressed.

6. The anti-rollover chair according to claim 4, characterized in that: When the locking handle is opened, the knob handle will be pulled outward at the same time, the fixing pin will be retracted into the threaded metal sleeve, and the inside of the clamping circular sleeve will open. At this time, the seat cushion assembly can be adjusted in height.

7. The anti-rollover chair according to claim 6, characterized in that: When the knob handle is loosened, the return spring will automatically pop out the fixing pin, and the fixing pin will be inserted into the side hole of the chair rod to prevent the seat cushion assembly from descending; When the locking handle is closed, the opening position of the clamping sleeve becomes smaller to H2, and the seat cushion assembly is firmly fixed on the chair rod.

8. The anti-rollover chair according to claim 1, characterized in that: A plurality of rollers are arranged at the bottom of the chair leg plastic part.

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