Chair leg forming method

Abstract

The invention discloses a chair leg forming method which comprises the steps of bending and forming a chair leg rod, configuring a pedal coaming, forming chair leg rod modules, manufacturing a plurality of chair leg rod modules according to the required number, assembling and the like. The side edges of the broadening parts can be surrounded by the edge covering structures, so that the broadening parts are prevented from scratching a seated person, the safety of the chair legs is improved, the treading surfaces of the chair legs are widened, the whole assembling process of the chair leg rods and the pedal surrounding plates does not need to be subjected to spot welding for many times, and the assembling efficiency of the chair legs is improved.

Description

Technical Field

[0001] This invention relates to the field of seating, and in particular to a method for forming chair legs. Background Technology

[0002] Most office chairs or ergonomic chairs have adjustable gas springs attached to their legs, allowing for height adjustment. The legs consist of a base and five tubular metal leg posts evenly distributed around the base. These leg posts radiate outwards and are typically fixed to the base by welding or by inserting screws to ensure the stability of the chair. The user can rest their feet on the corresponding leg posts for comfortable foot support.

[0003] However, existing chair legs are usually quite narrow, which can cause discomfort for people with wider legs; for example... Figure 16 As shown, in order to reduce the discomfort underfoot, an existing chair leg has a foot pedal 2s welded and fixed to the upper end of each chair leg 2 connected to the base 1. The foot pedal 2s has symmetrical side wings that extend beyond both sides of the chair leg, thereby widening the footing surface of the chair leg 2 and improving sitting comfort; however, this design still has shortcomings.

[0004] The chair legs and foot pedals are quite long. When welding the foot pedals to the chair legs, dozens of spot welds or segmented welds are required at the connection points between each foot pedal and the corresponding chair leg. Since each chair leg usually has five foot pedals, dozens of spot welds or segmented welds are needed to fully form the chair leg. This undoubtedly increases the welding workload of the workers and the forming time of the chair leg, affecting the assembly efficiency of the chair leg.

[0005] While welding the foot pedal to the top of the chair legs can increase the foot area and improve seating comfort, the sharp edges on the side of the foot pedal can easily scratch the user when moving their feet from between the two chair legs to the top of the foot pedal, posing a certain safety hazard.

[0006] Based on the above issues, there is still considerable room for improvement in the safety, comfort, and ease of assembly of existing chair legs. Summary of the Invention

[0007] This invention provides a chair leg forming method. By sliding the edge-covering structure of the footrest panel with the widened part, the edge-covering structure can surround the side edge of the widened part to prevent it from scratching the sitter, thus improving the safety of the chair leg and widening the stepping surface of the chair leg. Moreover, the entire assembly process of the chair leg and the footrest panel does not require multiple spot welding, thus improving the assembly efficiency of the chair leg.

[0008] The technical solution of this invention is implemented as follows: A method for forming chair legs includes the following steps: Chair leg bending and forming: A single piece of sheet metal with a predetermined outline is bent into a chair leg, which includes a support part and a widening part symmetrically connected to both sides of the support part; Configure a foot pedal enclosure; the foot pedal enclosure includes an enclosure part that can completely enclose the upper end of the support part and the exposed surface of the widening part, and two flanged parts formed by turning the two sides of the enclosure part inward, each flanged part and the enclosure part forming a binding structure, the binding structure having a guide groove corresponding to the position of the widening part. The chair leg module is formed; the widened part is aligned with the corresponding guide groove, and then the footrest is slidably fitted onto the chair leg to form the chair leg module; at this time, the enclosure part encloses the upper end of the support part and the exposed surface of the widened part, and the edging structure surrounds the two sides of the widened part. Make multiple chair leg modules as required; repeat the above steps in sequence to produce multiple chair leg modules; Assembly; Welding multiple chair legs one by one along the circumference to fix them onto a base.

[0009] Preferably, in the step of bending and forming the chair leg, the length of the widened portion is equal to the overall length of the chair leg; and in the step of configuring the footrest panel, the length of the edging structure matches the overall length of the chair leg. This allows the widened portion to provide more stable support for the footrest panel.

[0010] Preferably, in the step of bending and forming the chair leg, the length of the widened section is less than the overall length of the chair leg; in the step of configuring the footrest panel, the length of the edging structure matches the overall length of the chair leg. This ensures that the widened section is covered by the footrest panel in the length direction, improving the safety of the chair legs while saving material costs.

[0011] Preferably, in the step of bending and forming the chair leg, the widened portion includes a transverse portion integrally formed with the support portion and a longitudinal portion extending downward from the outer edge of the transverse portion; in the step of configuring the footrest panel, the enclosure portion includes a footrest portion and side guard portions extending downward from both sides of the footrest portion, with the lower edge of the side guard portions turned inward to form the turned-up portion; in the step of forming the chair leg module, the footrest portion encloses the upper end of the support portion and the two transverse portions simultaneously; the side guard portions enclose the longitudinal portion; the downwardly extending longitudinal portion can improve the structural strength of the transverse portion and cover the connection position between the support portion and the transverse portion, reducing the abruptness formed by the transverse portion, while allowing the chair leg and footrest panel to retain a certain sense of thickness in appearance.

[0012] Preferably, between the steps of bending and shaping the chair legs and configuring the footrest, there is another step: A positioning seat is fixedly connected to the end of the chair leg facing away from the base; In the step of configuring the footrest panel, the footrest panel also includes a stop seat corresponding to the position of the positioning seat. The stop seat includes a top plate integrally formed with the enclosure part and a longitudinal baffle extending downward from the end edge of the top plate. In the step of forming the chair leg module, when the edging structure is fitted onto the chair leg, the top plate covers the upper end of the positioning seat, and the positioning seat abuts against the longitudinal baffle. Then, the positioning seat and the stop seat are fixed together by welding to prevent the footrest panel from loosening after being fitted.

[0013] Preferably, between the steps of bending and shaping the chair legs and configuring the footrest, there is another step: Configure a positioning seat; In the step of configuring the footboard enclosure, the footboard enclosure also includes a stop seat corresponding to the position of the positioning seat. The stop seat includes a top plate integrally formed with the enclosure part and located at the upper end of the positioning seat, and a longitudinal baffle extending downward from the end edge of the top plate. In the process of forming the chair leg module, the positioning seat is first placed at the end of the chair leg facing away from the base; then the footrest plate is fitted on until the top plate covers the upper end of the positioning seat, and the positioning seat abuts against the longitudinal baffle; then the positioning seat, the baffle seat, and the chair leg are fixed together by welding.

[0014] Preferably, in the chair leg bending and forming step, at least one of the widened portions has a locking groove at its top; in the step of configuring the footrest panel, an elastic component corresponding to the position of the locking groove is fixed on the footrest panel. In the chair leg module forming step, when the edging structure is fitted onto the chair leg, the elastic component is squeezed and deformed by the corresponding widened part. After the edging structure is fitted onto the chair leg, the elastic component is inserted into the locking groove and a gap fit is formed between the footrest and the chair leg, so that the footrest can elastically float up and down or deflect with the elastic component as the fulcrum.

[0015] Preferably, in the step of configuring the footrest panel, the inner surface of the footrest panel is provided with two spaced buffer pads; in the step of forming the chair leg module, after the edging structure is fitted onto the chair leg, the two buffer pads are symmetrically located on both sides of the elastic component.

[0016] Preferably, in the step of configuring the footrest panel, the elastic component includes a rigid engaging component and an elastic component fixed to the rigid engaging component, with the elastic component fixedly connected to the inner surface of the footrest panel; in the step of forming the chair leg module, the rigid engaging component is engaged into the engaging groove.

[0017] A method for forming chair legs includes the following steps: Chair leg bending and forming: On a single piece of pre-defined profile plate, a widening area and an insertion area are divided, and a bending release groove that connects outward is left at the junction of the widening area and the insertion area. Then, the single piece of plate is bent as a whole to form a chair leg with a widening section and a tubular insertion section. The widening section includes a support part and widening parts symmetrically connected to both sides of the support part. Configure a foot pedal enclosure; the foot pedal enclosure includes an enclosure part that can completely enclose the upper end of the support part and the exposed surface of the widening part, and two flanged parts formed by turning the two sides of the enclosure part inward, each flanged part and the enclosure part forming a binding structure, the binding structure having a guide groove corresponding to the position of the widening part. The chair leg module is formed; the widened part is aligned with the corresponding guide groove, and then the footrest is slidably fitted onto the chair leg to form the chair leg module; at this time, the enclosure part encloses the upper end of the support part and the exposed surface of the widened part, and the edging structure surrounds the two sides of the widened part. Make multiple chair leg modules as required; repeat the above steps and process multiple chair leg modules. Assembly; fixing multiple chair legs one by one along the circumference to a base; the base includes a base body and multiple plugs arranged at intervals along the circumference on the base body; each plug is inserted into a corresponding tubular connector and locked with screws.

[0018] The beneficial effects of the present invention, which adopts the above technical solution, are as follows: This invention pre-bends a single sheet of material with a predetermined outline into a chair leg with an extended section, and configures it with a footrest panel for easy stepping. When assembling the chair leg, simply slip the footrest panel onto the chair leg, eliminating multiple spot welding steps and simplifying the chair leg assembly process. At the same time, the edge-covering structure on the footrest panel protects the sharp side edges of the extended section from scratching the occupant, thus increasing the stepping area of ​​the chair leg while also improving its safety and comfort.

[0019] In the chair leg forming method of the present invention, regardless of whether the chair leg rod and the base are fixed by welding or by insertion, it does not affect the setting of the widened part and footrest plate on the chair leg rod, and has a wide range of applications.

[0020] The widening section includes transverse sections integrally formed on both sides of the support section. A longitudinal section extends downward from the outer end of the transverse section. The footrest and side panels on the footrest panel enclose the transverse and longitudinal sections respectively. In addition to enhancing the structural strength of the transverse section, the longitudinal section also makes the sharp side edge of the widening section lower than the footrest surface, reducing the probability of the foot colliding with the edge structure. At the same time, it also effectively conceals the connection between the support section and the transverse section, so that the footrest panel and chair leg retain the necessary thickness after assembly, thus making the overall appearance of the chair leg more harmonious and aesthetically pleasing.

[0021] Without welding the positioning seat to the footrest panel, an elastic component is installed between the footrest panel and the widened section. After the elastic component engages with the locking groove of the widened section, the footrest panel can elastically float up and down or slightly deflect when subjected to downward stepping force, forming a floating adaptive support for the user's feet, further enhancing the comfort and enjoyment of the chair legs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the shape of the chair legs; Figure 2 This is an exploded view of the chair legs from a top-down perspective; Figure 3 An exploded view of the chair legs from an upward angle; Figure 4 This is a schematic diagram showing the widened portion of a chair leg after a single piece of sheet metal has been bent into an integral shape, with the same length as the chair leg. Figure 5 This is a schematic diagram showing that the widened portion of a single sheet of wood is less than the total length of the chair legs after bending. Figure 6 A sectional view of the footrest panel fitted onto the chair legs; Figure 7 A schematic diagram showing how the positioning seat and footrest are first welded together, and then slidably fitted onto the chair leg; Figure 8 A schematic diagram showing how the footrest is first fitted onto the chair leg, and then the positioning seat is welded between the chair leg and the footrest; Figure 9 This is an exploded view of the chair legs from a top-down perspective in Example 2; Figure 10 This is an exploded view of the chair legs from a low angle in Example 2; Figure 11 This is a schematic diagram of the integral bending of a sheet metal plate, which divides the widened area and the insertion area, to form the chair leg in Example 2; Figure 12 In Embodiment 3, the widened portion is a cross-sectional view that only includes the transverse portion; Figure 13 This is a cross-sectional view of Embodiment 4, showing the elastic member disposed between the widened portion and the enclosure portion; Figure 14 This is a cross-sectional view of Example 4 when the elastic element is an elastic sheet; Figure 15 This is a flowchart of the method steps of the present invention; Figure 16 This is a diagram showing the multiple spot welding of the foot pedal in the existing chair leg and its fixation to the chair leg rod, viewed from a low angle. The accompanying figures are labeled as follows: 1-Base, 11-Plug, 12-Screw hole, A2-Wideened area, B2-Insertion area, C2-Bending release groove, 2-Chair leg, 2a-Wideened section, 2s-Foot pedal, 21-Support, 22-Wideened section, 221-Transverse section, 222-Longitudinal section, 23-Positioning seat, 24-Tube-shaped insertion section, 25-Through hole, 26-Joint gap, 3-Foot pedal enclosure. 31-Enclosure section, 32-Edge structure, 311-Foot pedal section, 312-Side barrier section, 313-Flanged edge section, 314-Guide groove, 33-Blocking seat, 331-Top plate, 332-Longitudinal baffle, 333-Side baffle, 4-Shielding cover, 41-Upright plate, 5-Elastic element, 51-Rigid locking element, 52-Flexible pad, 53-Limiting part, 6-Buffer pad, 7-Locking groove, s-Gap. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention 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.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0025] This invention has multiple embodiments, the specific implementation methods of which are as follows: Example 1: As Figure 1-8 As shown, this embodiment provides a method for forming chair legs, including the following steps: The chair leg 2 is formed by bending; a single sheet of material with a predetermined outline is bent integrally to form the chair leg 2. The chair leg 2 includes a support part 21 and widening parts 22 symmetrically connected to both sides of the support part 21. The widening parts 22 and the support part 21 together constitute a widening section 2a. Specifically, the chair leg 2 is a sheet metal part formed by bending a single sheet of material with a predetermined outline integrally through a single-process mold. After the chair leg 2 is bent integrally, the support part 21 in the widening section 2a is a tubular structure with an open upper end. Its cross-sectional shape is usually U-shaped, but its cross-sectional shape can also be an arc shape with an opening at the upper end. The two widening parts 22 are connected to both sides of the upper opening edge of the tubular support part 21 by integral bending. The integral bending forming process allows the entire widening section 2a to be pre-formed integrally with high efficiency, without the need to weld the support part 21 and the widening parts 22. A footrest panel 3 is provided. Since the widened portions 22 on both sides of the support portion 21 have already increased the stepping area of ​​the chair leg 2, but they have sharp side edges that can easily scratch the sitter, making them unsuitable for directly providing foot support; therefore, this embodiment provides a footrest panel 3. The footrest panel 3 can be pre-processed using any method such as bending, welding, or casting. To save costs and manufacturing time, the footrest panel 3 is preferably a sheet metal part formed by integral bending, so that multiple footrest panels 3 can be mass-produced at once; the footrest panel 3 includes a... The upper end of the support 21 and the exposed surface of the widening 22 are completely enclosed by the enclosure 31, and two flanged portions 313 are formed by turning inward from the two side edges of the enclosure 31. The upper surface of the enclosure 31 can serve as a foot support surface. The bent flanged portion 313 has a flanged plate and an integrally formed arc-shaped portion that bends between the flanged plate and the enclosure 31. The curved arc-shaped portion is not sharp and will not scratch the person sitting in contact with it. Each flanged portion 313 forms a binding structure 32 with the enclosure 31. The binding structure 32 has a guide groove 314 corresponding to the position of the widening 22. Furthermore, if the footrest panel 3 is not installed and the widened portion 22 is used as the foot support, the connection between the widened portion 22 and the support portion 21 is easily bent and deformed downwards, resulting in unstable foot support effect. However, when the footrest panel 3 is slidably installed on the widened portion 22, the side edges of the two widened portions 22 are inside the edging structure 32, which restricts the downward bending and deformation of the two widened portions 22 and ensures the strength of the foot support structure.

[0026] The chair leg module is formed; during the forming of the chair leg module, there is no need for multiple spot welding. Simply align the widened part 22 with the corresponding guide groove 314, and then slide the footrest panel 3 onto the chair leg 2 to form the chair leg module. At this time, the enclosure part 31 encloses the upper end of the support part 21 and the exposed surface of the widened part 22, and the edge-wrapping structure 32 surrounds the two side edges of the widened part 22. The edge-wrapping structure 32, when properly fitted, can surround the sharp side edges of the widened part 22, preventing the occupant from directly contacting the widened part 22 and causing scratches, effectively improving the safety of the chair legs. Make multiple chair leg modules as needed; repeat the above steps in sequence to produce multiple chair leg modules; the number of chair leg modules is usually five, so as to form a stable support structure on the ground; Assembly; multiple chair leg rods 2 are welded and fixed to a base 1 one by one along the circumference; the base 1 is usually provided with a longitudinal insertion hole with an open top to facilitate insertion with the lifting gas rod; the chair leg rods 2 are usually welded to the outer peripheral side wall of the base 1.

[0027] Furthermore, such as Figure 4-5As shown, to fully cover the sharp side edges of the widened section 22, in the step of bending the chair leg 2, the length of the widened section 22 is less than the overall length of the chair leg 2; in the step of configuring the footrest panel 3, the length of the edging structure 32 matches the overall length of the chair leg 2, and the corresponding guardrail 31 and flange 313 are also approximately equal to the length of the chair leg 2. That is, along the length direction of the chair leg 2, the widened section 2a only occupies a part of the length of the chair leg 2, so that the widened sections 22 on both sides of the support 21 do not need to be the same length as the chair leg 2, providing sufficient footing. While reducing the area, it also saves material costs; and the length of the footrest panel 3 matches the length of the chair leg 2, so that the shorter extended section 2a can be completely covered by the footrest panel 3 in the length direction, preventing the sharp edges of the extended section 2a from being exposed and ensuring the safety of the chair legs; in addition, in the step of bending and forming the chair leg 2, the length of the extended section 22 can also be equal to the overall length of the chair leg 2; it is equivalent to treating the longer extended section 2a as the entire chair leg 2, which not only allows the footrest panel 2 to form a larger stepping area on the chair leg 2, but also allows the extended section 22 to provide more stable support for the footrest panel 3.

[0028] Furthermore, such as Figure 6As shown, the widening portion 22 can be a flat plate extending laterally from both sides of the support portion 21, and the enclosure portion 31 can be a horizontal plate enclosing the two flat plates and the upper opening of the support portion 21. The flanges on both sides of the horizontal plate can also form the edging structure 32. However, the shape of the footrest enclosure 3 and the chair leg 2 after assembly is T-shaped. The edging structure 32 protruding from both sides of the support portion 21 will not only affect the appearance of the chair leg, but may also collide with the moving feet. Although it will not scratch the feet, it will still cause discomfort. Therefore, in order to improve the aesthetics and foot support comfort of the chair leg as much as possible, in the step of bending the chair leg 2, the widening portion 22 includes a horizontal portion 221 integrally formed with the support portion 21 and a longitudinal portion 222 extending downward from the outer edge of the horizontal portion 221. In the step of configuring the footrest enclosure 3, the enclosure portion 31 includes a footrest portion 311 and a longitudinal portion 222 extending downward from both sides of the footrest portion 311. The side panel 312 extends downwards, and the lower edge of the side panel 312 is turned inwards to form the turned-up edge 313. In the chair leg module forming step, the footrest 311 encloses the upper end of the support 21 and the two transverse parts 221. The side panel 312 encloses the longitudinal part 222. The downwardly extending longitudinal part 222 can improve the structural strength of the transverse part 221 and make the height of the sharp side edge of the widened part 22 lower than the height of the footrest 311. The occupant can easily place their feet on the footrest 311, and their feet will not easily collide with the edge structure 32 on the footrest panel 3. At the same time, the longitudinal part 222 can also cover the connection position of the support 21 and the transverse part 221, reduce the abruptness formed by the transverse part 221, and at the same time make the chair leg 2 and the footrest panel 3 retain a certain thickness in appearance, so that the overall shape of the chair leg 2 looks more harmonious and beautiful.

[0029] Furthermore, to ensure that the footrest panel 3 can quickly and accurately connect with the chair leg 2, there is an additional step between bending and shaping the chair leg 2 and configuring the footrest panel 3: A positioning seat 23 is fixedly connected to the end of the chair leg 2 facing away from the base 1; the positioning seat 23 is usually also a metal part, which, in addition to its positioning function, can also be used to install the rollers that are in contact with the ground. In the step of configuring the footrest panel 3, the footrest panel 3 also includes a stop seat 33 corresponding to the position of the positioning seat 23. The stop seat 33 includes a top plate 331 integrally formed with the enclosure part 31, and a longitudinal baffle 332 extending downward from the end edge of the top plate 331. The two sides of the top plate 331 extend downward and form side baffles 333 on both sides of the positioning seat 23. In the step of forming the chair leg module, when the edge-wrapping structure 32 is fitted onto the chair leg 2, the top plate 331 covers the upper end of the positioning seat 23, the positioning seat 23 abuts against the longitudinal baffle 332, and restricts the footrest panel 3 from continuing to slide, thereby playing a role in installation and positioning. At this time, the side baffles 333 cover the connection position between the top plate 331 and the positioning seat 23, making the appearance of the chair leg more coordinated. Then, the positioning seat 23 and the stop seat 33 are fixed together by welding. This prevents the footrest panel 3 from becoming loose or making abnormal noise when providing support for the feet after being fitted, ensuring the user experience of the chair leg; or, as Figure 8 As shown, the positioning seat 23 can also be kept separate from the chair leg 2 first. Then, in the chair leg module forming step, the positioning seat 23 is placed at the end of the chair leg 2 facing away from the base 1. After that, the footrest plate 3 is fitted on until the top plate 331 covers the upper end of the positioning seat 23 and the positioning seat 23 abuts against the longitudinal baffle 332. Then, the positioning seat 23, the baffle 33, and the chair leg 2 are fixed together by welding. This can also achieve the same effect as the above method.

[0030] Furthermore, in addition to the methods mentioned above, such as Figure 7 As shown, the positioning seat 23 can also be welded to the stop seat 33 first, and then the footrest plate 3 can be slidably fitted onto the widened part 22 so that the end of the chair leg tube 2 abuts against the positioning seat 23, and then the positioning seat 23 can be welded to the chair leg tube 2 to fix it; the same effect as the above method can also be achieved.

[0031] Furthermore, after completing the assembly steps, there is a step of installing the cover 4. The cover 4 includes a cover plate that covers the upper end of the base 1. The cover plate has longitudinal through holes corresponding to the longitudinal insertion holes to facilitate the insertion of the gas spring. The area of ​​the cover plate is larger than the area of ​​the upper end surface of the base 1. Multiple circumferentially spaced vertical plates 41 extend downward from the edge of the cover plate. A clearance area is formed between every two adjacent vertical plates 41 to avoid the chair leg 2 and the footrest panel 3. During installation, the clearance area is aligned with the corresponding chair leg 2, and then the cover 4 is fastened to the top of the base 1 so that the cover plate covers the upper end surface of the base 1 and covers the connection position between the base 1 and the chair leg 2. At the same time, the vertical plate 41 can be folded to the joint between two adjacent footrest panels 3 and the base 1, making the shape of the chair legs look more beautiful.

[0032] Example 2: As Figure 9-11As shown, the difference between this embodiment and the above embodiment is that the chair leg 2 and the base 1 are detachably connected in this embodiment, so as to save packaging space and transportation costs for the chair legs; due to the change in the connection method between the chair leg 2 and the base 1, the corresponding steps in the entire chair leg forming method are also different; the chair leg forming method includes the following steps: Chair legs are bent into shape; such as Figure 11 As shown, a widening area A2 and an insertion area B2 are divided on a single piece of sheet metal with a predetermined contour. A bending release groove C2 that connects outward is left at the junction of the widening area A2 and the insertion area B2 to facilitate bending of the widening area A2 and the insertion area B2 with different contours. The single piece of sheet metal is then bent as a whole to form a chair leg 2 with a widening section 2a and a tubular insertion section 24. The widening section 2a includes a support part 21 and widening parts 22 symmetrically connected to both sides of the support part 21. The cross-section of the tubular insertion section 24 is roughly "U" shaped, and the upper end of the tubular insertion section 24 has a bent joint gap 26. A footrest panel 3 is configured; the footrest panel 3 includes a blocking part 31 that can completely enclose the upper end of the support part 21 and the exposed surface of the widened part 22, and two flanged parts 313 formed by turning the two side edges of the blocking part 31 inward. Each flanged part 313 forms a binding structure 32 with the blocking part 31. The binding structure 32 has a guide groove 314 corresponding to the position of the widened part 22. In this embodiment, the length of the binding structure 32 is preferably matched with the length of the chair leg 2 so that the binding structure 32 can completely surround the widened part 22. The chair leg module is formed; the widened part 22 is aligned with the corresponding guide groove 314, and then the footrest plate 3 is slidably sleeved on the chair leg 2 to form the chair leg module; at this time, the enclosure part 31 encloses the upper end of the support part 21 and the exposed surface of the widened part 22, and the edge-wrapping structure 32 surrounds the two sides of the widened part 22. Make multiple chair leg modules as needed; repeat the above steps and process multiple chair leg modules; the number of chair leg modules is usually five, so as to form a stable support structure on the ground; Assembly: Multiple chair legs 2 are fixed one by one circumferentially to a base 1; the base 1 includes a base 1 body and multiple plugs 11 arranged circumferentially on the base 1 body; each plug 11 is inserted into a corresponding tubular insertion section 24 and locked with screws; specifically, the plug 11 is provided with a screw hole 12, and the corresponding tubular insertion section 24 is provided with a corresponding through hole 25. When the tubular insertion section 24 and the corresponding plug 11 are inserted into place, the control screw passes through the through hole 25 and locks into the screw hole 12 to complete the screw connection between the corresponding chair leg 2 and the plug 11; after the assembly is completed, the chair legs in this embodiment have good appearance and use effect, just like the chair legs in the above embodiments.

[0033] Example 3: As Figure 12 As shown, the difference between this embodiment and the above embodiment is that, in order to reduce material costs and processing difficulty, the widening part 22 in this embodiment includes a transverse part 221 integrally formed with the support part 21, and no longer retains the longitudinal part 222; specifically, in the step of bending and forming the chair leg, the widening part 22 includes a transverse part 221 integrally formed with the support part 21; the transverse part 221 is a side wing extending beyond both sides of the support part 21; in the step of configuring the footrest panel, the enclosure part 3 includes a footrest part 311 that simultaneously encloses the upper end of the support part 21 and the two transverse footrest parts 311, and the side edge of the footrest part 311 is turned inward to form the turned-up part 313; without considering the appearance of the chair legs, this design widens the stepping area and eliminates safety hazards while minimizing the manufacturing cost of the chair legs.

[0034] Example 4: Figure 13-14 As shown, the difference between this embodiment and the above embodiment is that after the positioning seat 23 is welded and fixed to the chair leg 2 and the footrest 3 is sleeved on the chair leg 2, it is not necessary to weld the stop seat 33 of the footrest 3 to the chair leg 2. Instead, the footrest 3 has a certain vertical movement space. Specifically, during the bending and forming of the chair leg 2, at least one widened part 22 has a locking groove 7 at its top. In the step of configuring the footrest 3, an elastic component corresponding to the position of the locking groove 7 is fixed on the footrest 3. The elastic component includes an elastic element 5, which can be an elastic block, a spring, or other component that can elastically deform under force. For example, the elastic component shown in this embodiment has an elastic block made of rubber material. The elastic block provides elastic floating support to the footrest 3 through its own elastic deformation. In the chair leg module molding process, when the edging structure 32 is fitted onto the chair leg 2, the elastic component is squeezed and deformed by the corresponding widening part 22. After the edging structure 32 is fitted onto the chair leg 2, the elastic component is engaged in the engaging groove 7, and a gap fit is formed between the footrest panel 3 and the chair leg 2. At this time, there is a gap s between the top of the widening part 22 and the inner surface of the footrest panel 3, so that the footrest panel 3 can elastically float up and down or deflect with the elastic component as the fulcrum. Specifically, when the foot applies a completely vertical downward pressure to the footrest panel 3 at the position corresponding to the elastic component, the elastic component can elastically deform, and the footrest panel 3 can form a suspended elastic support for the foot. Alternatively, when the foot applies downward pressure to the footrest panel 3 at a position not corresponding to the elastic component, that is, when the foot swings up and down, the footrest panel 3 can adaptively swing up and down slightly with the elastic component as the elastic swing fulcrum, so as to form adaptive support for the moving foot. This design is more in line with the human sitting habit and improves the comfort and fun of the chair leg support.

[0035] Furthermore, in the step of configuring the footrest panel 3, the inner surface of the footrest panel 3 is provided with two spaced cushioning pads 6. The cushioning pads 6 are soft pads, which are usually made of any flexible material such as rubber, sponge, cloth, or leather. In the step of forming the chair leg module, after the edge binding structure 32 is fitted onto the chair leg 2, the two cushioning pads 6 are symmetrically located on both sides of the elastic component. In this way, whether the footrest panel 3 is vertically elastically floating or swinging up and down, the cushioning pads 6 can prevent the footrest panel 3 from directly colliding with the widened part 22 and generating noise, further improving the user experience of the chair legs.

[0036] Furthermore, the elastic component may consist of only a single elastic element 5 with good elasticity. However, such a fully elastic element 5, after being inserted into the engaging groove 7, has insufficient structural strength, which can easily lead to insufficient support elasticity for the footrest panel 3, causing the gap s between the widened portion 22 and the footrest panel 3 to disappear. Therefore, in this embodiment, in the step of configuring the footrest panel 3, the elastic component includes not only the elastic element 5 but also a rigid engaging element 51 fixed to the elastic element 5. Specifically, in this embodiment, the elastic element 5 is only shown as an elastic block, and the rigid engaging element 51 has a slot. One end of the elastic element 5 is inserted and fixed in the slot, and the other end is fixedly connected to the inner surface of the footrest panel 3. In the chair leg module forming step, the rigid engaging element 51 is engaged into the engaging groove 7. This allows the elastic component to deform elastically by relying on the elastic element 5, while also providing sufficient support elasticity for the footrest panel 3 after the elastic component engages with the engaging groove 7 through the rigid engaging element 51.

[0037] Furthermore, a soft, flexible pad 52 is connected to one end of the rigid engaging member 51 facing the widened portion 22. The flexible pad 52 can be made of cloth, rubber, plastic, or leather. During the chair leg module molding step, when the footrest panel 3 is fitted onto the chair leg 2, the flexible pad 52 contacts the widened portion 22 and causes the elastic member 5 to deform elastically, so as to prevent the rigid engaging member 51 from scratching the widened portion 22 when the footrest panel 3 is fitted.

[0038] Furthermore, the elastic element 5 can also be a compression spring or a metal spring sheet welded to the rigid engaging element 51 and the inner surface of the foot pedal plate 3 at both ends respectively. Taking the metal spring sheet as an example, the spring sheet can remain vertical, so that the foot pedal plate 3 can only swing up and down after being subjected to downward pressure and cannot float up and down in the vertical direction; or the spring sheet can be welded obliquely between the rigid engaging element 51 and the foot pedal plate 3, so that the foot pedal plate 3 can swing up and down after being subjected to downward pressure, and can also float up and down in the vertical direction.

[0039] Furthermore, if the elastic element 5 is a metal spring sheet, protruding limiting parts 53 can be provided on both sides of the rigid engaging element 51. The limiting parts 53 can abut against the spring sheet when the spring sheet is bent to the maximum extent on one side, so as to prevent it from excessive elastic deformation.

[0040] 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 spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for forming chair legs, characterized in that, Includes the following steps: The chair leg (2) is bent into shape; a single piece of sheet metal with a predetermined outline is bent into a single piece to form the chair leg (2). The chair leg (2) includes a support part (21) and a widening part (22) symmetrically connected to both sides of the support part (21). Configure footboard enclosure (3); footboard enclosure (3) includes enclosure part (31) that can completely enclose the upper end of support part (21) and the exposed surface of widening part (22), and two flanged parts (313) formed by turning the two sides of enclosure part (31) inward, each flanged part (313) and enclosure part (31) forming a binding structure (32), the binding structure (32) having a guide groove (314) corresponding to the position of widening part (22). The chair leg module is formed; the widened part (22) is aligned with the corresponding guide groove (314), and the footrest panel (3) is slidably fitted onto the chair leg (2) to form the chair leg module; at this time, the enclosure part (31) encloses the upper end of the support part (21) and the exposed surface of the widened part (22), and the edge-wrapping structure (32) surrounds the two sides of the widened part (22); Make multiple chair leg modules as required; repeat the above steps in sequence to produce multiple chair leg modules; Assembly; Weld and fix multiple chair legs (2) one by one along the circumference to a base (1).

2. The chair leg forming method according to claim 1, characterized in that: In the step of bending the chair leg (2), the length of the widened part (22) is equal to the overall length of the chair leg (2); in the step of configuring the footrest panel (3), the length of the edging structure (32) matches the overall length of the chair leg (2).

3. The chair leg forming method according to claim 1, characterized in that: In the step of bending the chair leg (2), the length of the widened part (22) is less than the overall length of the chair leg (2); in the step of configuring the footrest panel (3), the length of the edging structure (32) matches the overall length of the chair leg (2).

4. The chair leg forming method according to claim 1, characterized in that: In the step of bending and forming the chair leg (2), the widened part (22) includes a transverse part (221) integrally formed with the support part (21) and a longitudinal part (222) extending downward from the outer edge of the transverse part (221); in the step of configuring the footrest panel (3), the enclosure part (31) includes a footrest part (311) and a side enclosure part (312) extending downward from both sides of the footrest part (311), and the lower edge of the side enclosure part (312) is turned inward to form the turned-up part (313); in the step of forming the chair leg module, the footrest part (311) encloses the upper end of the support part (21) and the two transverse parts (221) at the same time; the side enclosure part (312) encloses the longitudinal part (222) inside.

5. The chair leg forming method according to claim 1, characterized in that: Between the steps of bending and shaping the chair leg (2) and configuring the footrest panel (3), there are further steps: A positioning seat (23) is fixedly connected to one end of the chair leg (2) facing away from the base (1); In the step of configuring the footrest panel (3), the footrest panel (3) also includes a stop seat (33) corresponding to the position of the positioning seat (23). The stop seat (33) includes a top plate (331) integrally formed with the enclosure part (31) and a longitudinal baffle (332) extending downward from the end edge of the top plate (331). In the step of forming the chair leg module, when the edge-wrapping structure (32) is fitted into place on the chair leg (2), the top plate (331) covers the upper end of the positioning seat (23), and the positioning seat (23) abuts against the longitudinal baffle (332). Then the positioning seat (23) and the stop seat (33) are fixed together by welding.

6. The chair leg forming method according to claim 1, characterized in that: Between the steps of bending and shaping the chair leg (2) and configuring the footrest panel (3), there are further steps: Configure a positioning seat (23); In the step of configuring the footboard enclosure (3), the footboard enclosure (3) also includes a stop seat (33) corresponding to the position of the positioning seat (23). The stop seat (33) includes a top plate (331) integrally formed with the enclosure part (31) and located at the upper end of the positioning seat (23), and a longitudinal baffle (332) extending downward from the end edge of the top plate (331). In the process of forming the chair leg module, the positioning seat (23) is first placed on the end of the chair leg (2) facing away from the base (1); then the footrest panel (3) is fitted on until the top plate (331) covers the upper end of the positioning seat (23) and the positioning seat (23) abuts against the longitudinal baffle (332); then the positioning seat (23), the baffle seat (33), and the chair leg (2) are fixed together by welding.

7. The chair leg forming method according to claim 1, characterized in that: In the bending and forming step of the chair leg (2), at least one widened part (22) has a locking groove (7) at its top end; in the step of configuring the footrest panel (3), an elastic component corresponding to the position of the locking groove (7) is fixed on the footrest panel (3); In the chair leg module forming step, when the edge binding structure (32) is fitted onto the chair leg (2), the elastic component is squeezed and deformed by the corresponding widened part (22). After the edge binding structure (32) is fitted onto the chair leg (2), the elastic component is inserted into the locking groove (7) and a gap fit is formed between the footrest panel (3) and the chair leg (2), so that the footrest panel (3) can float up and down or deflect elastically with the elastic component as the fulcrum.

8. The chair leg forming method according to claim 7, characterized in that: In the step of configuring the footrest panel (3), the inner surface of the footrest panel (3) is provided with two spaced buffer pads (6); in the step of forming the chair leg module, after the edge-wrapping structure (32) is fitted into place on the chair leg (2), the two buffer pads (6) are symmetrically located on both sides of the elastic component.

9. The chair leg forming method according to claim 7, characterized in that: In the step of configuring the footrest panel (3), the elastic component includes a rigid engaging member (51) and an elastic member (5) fixed on the rigid engaging member (51). The elastic member (5) is fixedly connected to the inner surface of the footrest panel (3). In the step of forming the chair leg module, the rigid engaging member (51) is engaged into the engaging groove (7).

10. A method for forming chair legs, characterized in that, Includes the following steps: The chair leg (2) is bent into shape; a widening area (A2) and an insertion area (B2) are divided on a single piece of pre-defined profile plate, and a bending release groove (C2) that connects outward is left at the junction of the widening area (A2) and the insertion area (B2). The single piece of plate is bent as a whole to form a chair leg (2) with a widening section (2a) and a tubular insertion section (24). The widening section (2a) includes a support part (21) and widening parts (22) symmetrically connected to both sides of the support part (21). Configure footboard enclosure (3); footboard enclosure (3) includes enclosure part (31) that can completely enclose the upper end of support part (21) and the exposed surface of widening part (22), and two flanged parts (313) formed by turning the two sides of enclosure part (31) inward, each flanged part (313) and enclosure part (31) forming a binding structure (32), the binding structure (32) having a guide groove (314) corresponding to the position of widening part (22). The chair leg module is formed; the widened part (22) is aligned with the corresponding guide groove (314), and the footrest panel (3) is slidably fitted onto the chair leg (2) to form the chair leg module; at this time, the enclosure part (31) encloses the upper end of the support part (21) and the exposed surface of the widened part (22), and the edge-wrapping structure (32) surrounds the two sides of the widened part (22); Make multiple chair leg modules as required; repeat the above steps and process multiple chair leg modules. Assembly; fixing multiple chair legs (2) one by one along the circumference to a base (1); the base (1) includes a base (1) body and multiple plugs (11) arranged circumferentially on the base (1) body; each plug (11) is plugged into a corresponding tubular plug section (24) and locked with screws.

Images