Chair leg base and chair leg dismounting and mounting structure

Abstract

The utility model discloses a chair leg base and a chair leg disassembly and assembly structure, the chair leg base comprises a base body, the middle part of the base body is provided with a vertically through jack, the base body is provided with a plurality of support parts which extend outwards and are uniformly distributed along the circumferential direction, and the support parts are used for being detachably connected with chair leg rods; annular protruding parts corresponding to the inserting holes in position are integrally formed on the upper end face or the lower end face of the base body. According to the chair leg base, the annular protrusion part can reinforce the structural strength of the chair leg base in the longitudinal direction, after the supporting part on the chair leg base is connected with a chair leg rod, when the supporting part generates acting force on the base body, on the premise that the width of the chair leg base is small, the base body can resist the acting force of the supporting part on the base body through the reinforcement of the annular protrusion, and therefore the chair leg base is convenient to use. Therefore, excessive stress is prevented from being concentrated on the base body, the width of the chair leg base is reduced, and the strength requirement of the chair leg is met.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a chair leg base and a chair leg assembly / disassembly structure. Background Technology

[0002] To save on transportation volume and cost, the legs of existing office chairs or ergonomic chairs are usually made with a detachable structure. Most chair legs include a base, which usually has a socket for inserting a gas spring. There are multiple outwardly extending support parts around the base, and chair leg rods are connected to the support parts by screws. There are usually five support parts and chair leg rods. During transportation, the chair leg rods are detached from the support parts and packed separately. When in use, the chair leg rods are installed on the corresponding support parts and put into contact with the ground to support the office chair or ergonomic chair.

[0003] To ensure strength and lifespan, existing chair legs typically have a wide base to maintain structural stability and prevent deformation when the chair leg contacts the ground. However, a wider base consumes more material and occupies more space. Especially during mass production, this significantly increases the manufacturing and production costs of the chair legs. On the other hand, if the base width is reduced to save costs, the insufficient width will lead to a decrease in structural strength when the chair leg contacts the ground and bends, resulting in safety issues and failing to meet the strength requirements of the chair legs. Summary of the Invention

[0004] This utility model provides a chair leg base and a chair leg assembly / disassembly structure. The structural strength of the chair leg base is enhanced longitudinally by the annular protrusions on the upper or lower end face of the base body. This allows the chair leg base to withstand the force exerted on the base body by the support part through the reinforcement of the annular protrusions, even with a relatively small width. This avoids excessive stress concentration on the base body, reduces the width of the chair leg base, and meets the strength requirements of the chair leg.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A chair leg base includes a base body with a through-hole in the middle. The base body has multiple outwardly extending and circumferentially distributed support portions for detachable connection with the chair leg. An annular protrusion corresponding to the position of the through-hole is integrally formed on the upper or lower end surface of the base body. When the support portion is under force, the annular protrusion strengthens the base body to counteract the force exerted by the support portion on the base body.

[0007] Preferably, each support part and the annular protrusion are integrally formed with a connecting part; when the support part is under force, the force can be transmitted to the annular protrusion through the connecting part, so as to share the force directly exerted by the support part on the base body; thus avoiding the force generated by the support part being concentrated on the base body and ensuring the structural strength of the base body.

[0008] Preferably, the annular protrusion and the connecting part are integrally formed on the lower end of the base body, ensuring a simple appearance on the upper end of the base body.

[0009] Preferably, the support is provided with one or more screw holes for detachable connection with the chair legs; so as to facilitate screw connection with the chair legs.

[0010] Preferably, the base body includes a rigid metal frame and a plastic layer integrally covered by the rigid metal frame, with the annular protrusion integrally formed on the plastic layer; the rigid metal frame includes a rigid ring and multiple rigid support rods integrally welded to the outer wall of the rigid ring, the rigid ring and the plastic layer covering the rigid ring constitute the base body, and the rigid support rods and the plastic layer covering the rigid metal rods constitute the support part; through the double-layer structure of the plastic layer covering the rigid metal frame, the structural strength of the entire base body is greatly improved.

[0011] Preferably, the screw hole is located on the plastic layer portion of the rigid support rod, and the rigid support rod is provided with a relief groove to avoid the screw hole.

[0012] Preferably, the maximum width of the base body in the horizontal direction is 15-24cm.

[0013] Preferably, the lower end of the connecting portion does not extend beyond the lower end of the annular protrusion to prevent the connecting portion from exerting excessive force on the annular protrusion.

[0014] A chair leg assembly / disassembly structure includes multiple hollow chair leg rods and chair leg bases. The number of chair leg rods corresponds to the number of support parts. The chair leg rods are fitted onto the corresponding support parts and connected by screws.

[0015] Preferably, the support part is provided with one or more screw holes, and the chair leg is provided with through holes corresponding to the screw holes. The screw passes through the through hole and is locked into the screw hole to fix the corresponding chair leg to the support part.

[0016] The beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0017] This utility model strengthens the base body longitudinally by providing an integrally formed annular protrusion on the upper or lower end face of the base body, thereby increasing the structural strength of the base body without expanding the width of the base body. This allows the base body to meet the structural strength requirements during use while occupying a small space.

[0018] The annular protrusion and the support are integrally formed with a corresponding connecting part. The connecting part provides a force transmission bridge between the support and the annular protrusion. When the chair leg is connected to the corresponding support and the support exerts a bending force on the base body, the connecting part can transmit the force to the annular protrusion. The annular protrusion partially bears the force received by the base body, avoiding stress concentration on the base body and affecting the structural strength and service life of the base body.

[0019] As another approach, the entire chair leg base has a double-layer structure, including a plastic layer and a rigid metal support frame built into the plastic layer. The rigid support frame is equivalent to the skeleton of the entire base. Compared with a chair leg base that only uses a plastic structure, the structure with the rigid support frame has higher strength and greater durability. Attached Figure Description

[0020] Figure 1 A schematic diagram of the chair leg assembly / disassembly structure;

[0021] Figure 2 Exploded view of the chair leg assembly / disassembly structure;

[0022] Figure 3 This is an exploded view of the chair leg assembly / disassembly structure from another angle;

[0023] Figure 4 A structural schematic diagram of the lower end face of the base body;

[0024] Figure 5 This is a schematic diagram showing the casing after it has been separated from the base body;

[0025] Figure 6 This is a schematic diagram of a rigid metal frame structure;

[0026] Figure 7 This is a cross-sectional view of the support portion within the base body;

[0027] Figure 8 This is a schematic diagram of an internally threaded sleeve in a receiving hole;

[0028] Figure 9 A cross-sectional view showing the location of the receiving hole on the support section;

[0029] The reference numerals in the attached drawings are as follows: 1-base body, 1a-insertion hole, 2-chair leg, 3-cover, 4-screw, 5-rigid metal frame, 6-plastic layer, 11-support part, 12-annular protrusion, 13-connecting part, 14-screw hole, 15-internal threaded sleeve, 16-accommodating hole, 17-threaded section, 21-through hole, 51-rigid ring, 52-rigid support rod, 521-support, 522-clearance groove. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0032] The specific embodiments of this utility model are as follows:

[0033] like Figure 1-9 As shown, this embodiment provides a chair leg base, including a base body 1. The base body 1 has a through-hole 1a in the middle, which is typically used to connect with a gas spring on a seat. The base body 1 has a plurality of outwardly extending and circumferentially distributed support portions 11, which are detachably connected to the chair leg rod 2. To enhance the structural strength of the base without increasing its horizontal width, this embodiment integrally forms a part on the upper or lower end surface of the base body 1 that corresponds to the through-hole. The annular protrusion 12 at position 1a enhances the structural strength of the base body 1 without increasing the horizontal width of the base. The diameter of the inner hole on the annular protrusion 12 can be larger than the diameter of the insertion hole 1a, or it can be the same as the diameter of the insertion hole 1a. In this embodiment, the diameter of the inner hole is the same as the diameter of the insertion hole 1a. Therefore, when the support 11 is subjected to force, the annular protrusion 12 strengthens the base body 1 to counteract the force exerted by the support 11 on the base body 1.

[0034] Furthermore, such as Figure 4 As shown, to make the structure of the entire chair base more stable, a connecting part 13 is integrally formed between each support part 11 and the annular protrusion 12; to ensure the simple appearance of the upper end of the base body 1, the annular protrusion 12 and the connecting part 13 are integrally formed at the lower end of the base body 1; when the support part 11 is under force, the force can be transmitted to the annular protrusion 12 through the connecting part 13 to share the force directly exerted by the support part 11 on the base body 1; to avoid the force generated by the support part 11 being concentrated on the base body 1, to prevent stress concentration, and to ensure the structural strength of the base body 1.

[0035] Furthermore, if the thickness of the connecting portion 13 is too large, the excess portion will extend beyond the lower end of the annular protrusion 12. This will not only make the lower end of the chair leg base more prominent, but also exceed the stress range of the annular protrusion 12. When the support portion 11 is under stress, the annular protrusion 12 is prone to cracking. Therefore, in this embodiment, the thickness of the connecting portion 13 is less than or equal to the thickness of the annular protrusion 12, that is, the lower end of the connecting portion 13 does not extend beyond the lower end of the annular protrusion 12, so as to avoid the connecting portion 13 exceeding the stress range of the annular protrusion 12 and prevent the connecting portion 13 from exerting excessive force on the annular protrusion 12.

[0036] Furthermore, such as Figure 8-9 As shown, to facilitate connection with the chair leg 2, the support part 11 is provided with one or more screw holes 14 for detachable connection with the chair leg 2; specifically, the support part 11 is provided with one or more receiving holes 16, and each receiving hole 16 is pre-embedded with an internal threaded sleeve 15 having a screw hole 14; the screw hole 14 is the internal threaded hole of the internal threaded sleeve 15. To ensure the stability of the pre-embedded internal threaded sleeve 15, the external of the internal threaded sleeve 15 has an external thread. During pre-embedding, the external thread forms a threaded engagement with the inner wall of the receiving hole 16, thereby forming a threaded engagement section 17 in the receiving hole 16, so that the internal threaded sleeve 15 will not come out of the receiving hole 16.

[0037] Furthermore, such as Figure 6-7 As shown, to further enhance the structural strength of the chair leg base, the base body 1 includes a rigid metal frame 5 and a plastic layer 6 integrally covered by the rigid metal frame 5. The annular protrusion 12 is integrally formed on the plastic layer 6. The rigid metal frame 5 includes a rigid ring 51 and multiple rigid support rods 52 integrally welded to the outer wall of the rigid ring 51. The rigid ring 51 and the plastic layer covering the rigid ring 51 constitute the base body 1, and the rigid support rods 52 and the plastic layer covering the rigid metal rods constitute the support part 11. Compared with the existing chair leg bases that only use plastic structures, the double-layer structure of the rigid metal frame 5 covered by the plastic layer greatly enhances the structural strength of the entire base body 1.

[0038] Furthermore, to avoid interference between the screw hole 14 on the internal thread sleeve 15 and the rigid metal frame 5, the screw hole 14 is located on the plastic layer portion of the rigid support rod 52, and the rigid support rod 52 is provided with a relief groove 522 to avoid the screw hole 14; specifically, to further save materials and costs, the rigid support rod 52 in this embodiment includes two L-shaped and spaced-apart supports 521, and the relief groove 522 is located between the two supports 521.

[0039] Furthermore, after setting the annular protrusion 12, the horizontal width of the base body 1 in this embodiment can be designed to be smaller, but it should still be within a reasonable range; if the horizontal width of the base body 1 is too small, it will still affect the structural strength of the base. Therefore, the maximum width range of the base body 1 in the horizontal direction in this embodiment is set to 15-24cm.

[0040] Furthermore, a chair leg disassembly and assembly structure is provided, including multiple hollow chair leg rods 2 and the chair leg base. The chair leg rods 2 are hollow metal tubes, and the number of chair leg rods 2 corresponds to the number of support parts 11. The chair leg rods 2 are fitted onto the corresponding support parts 11 and connected by screws, so that the chair leg rods 2 can be disassembled and packaged for transportation. Specifically, the chair leg rods 2 are provided with through holes 21 corresponding to screw holes 14. Screws 4 pass through the through holes 21 and lock into the screw holes 14 to fix the corresponding chair leg rods 2 to the support parts 11. When the chair leg rods 2 are in contact with the ground and are under force, the support parts 11 can transmit the generated bending force to the annular protrusions 12 through the connecting parts 13, ensuring that the base is stable under force, even with a small horizontal width.

[0041] Furthermore, to ensure the overall appearance of the chair leg assembly structure is simple, the chair leg assembly structure also includes a cover 3. The cover 3 can be made of metal or other materials with a metallic luster. After each chair leg 2 is connected to the corresponding support part 11, each chair leg 2 will form a mounting groove with the base body 1 that matches the cover 3. The cover 3 is inserted into the upper end of the base body 1 and fits into the mounting groove. The cover 3 is flush with the chair leg 2, so that the assembled chair leg assembly structure has a metallic appearance and looks more attractive.

[0042] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A chair leg base, characterized in that, The base body (1) includes a base body (1) with a through-hole (1a) in the middle. The base body (1) has multiple support parts (11) that extend outward and are evenly distributed in the circumferential direction. The support parts (11) are used to detachably connect with the chair leg (2). The upper or lower end surface of the base body (1) is integrally formed with an annular protrusion (12) corresponding to the position of the through-hole (1a). When the support part (11) is subjected to force, the annular protrusion (12) strengthens the base body (1) to counteract the force exerted by the support part (11) on the base body (1).

2. The chair leg base according to claim 1, characterized in that: Each support (11) and the annular protrusion (12) are integrally formed with a connecting part (13); when the support (11) is under force, the force can be transmitted to the annular protrusion (12) through the connecting part (13) to share the force formed by the support (11) directly on the base body (1).

3. A chair leg base according to claim 2, characterized in that: The annular protrusion (12) and the connecting part (13) are integrally formed on the lower end of the base body (1).

4. A chair leg base according to claim 1, characterized in that: The support (11) is provided with one or more screw holes (14) for detachable connection with the chair leg (2).

5. A chair leg base according to claim 1 or 4, characterized in that: The base body (1) includes a rigid metal frame (5) and a plastic layer (6) integrally covered by the rigid metal frame (5). The annular protrusion (12) is integrally formed on the plastic layer (6). The rigid metal frame (5) includes a rigid ring (51) and a plurality of rigid support rods (52) integrally welded to the outer wall of the rigid ring (51). The rigid ring (51) and the plastic layer covering the rigid ring (51) constitute the base body (1). The rigid support rods (52) and the plastic layer covering the rigid metal rods constitute the support part (11).

6. A chair leg base according to claim 5, characterized in that: The screw hole (14) is located on the plastic layer portion of the rigid support rod (52), and the rigid support rod (52) is provided with a relief groove (522) to avoid the screw hole (14).

7. A chair leg base according to claim 1, characterized in that: The maximum width of the base body (1) in the horizontal direction is 15-24cm.

8. A chair leg base according to claim 3, characterized in that: The lower end of the connecting part (13) does not extend beyond the lower end of the annular protrusion (12).

9. A chair leg detachment structure, characterized in that, It includes multiple hollow chair legs (2) and a chair leg base as described in any one of claims 1-8, wherein the number of chair legs (2) corresponds to the number of support parts (11), and the chair legs (2) are fitted onto the corresponding support parts (11) and connected by screws.

10. A chair leg disassembly and assembly structure according to claim 9, characterized in that: The support part (11) is provided with one or more screw holes (14), and the chair leg (2) is provided with through holes (21) corresponding to the screw holes (14). The screw (4) passes through the through hole (21) and locks into the screw hole (14) to fix the corresponding chair leg (2) to the support part (11).

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