Chair leg structure

Abstract

The utility model discloses a chair leg structure which comprises two oppositely arranged telescopic chair legs, each telescopic chair leg comprises at least two leg pipes which are in sliding sleeve connection with each other, each leg pipe is provided with a locking assembly for locking the sliding of the adjacent leg pipe, a synchronous connecting rod is arranged between one leg pipe in the telescopic chair legs and one leg pipe in the other telescopic leg pipe, and the synchronous connecting rod is provided with a locking assembly for locking the sliding of the adjacent leg pipes. The locking assemblies are located at two ends of the synchronous connecting rod. According to the chair leg structure, the synchronous connecting rod is arranged between the leg pipes of the two telescopic chair legs, the locking assemblies for locking mutual sliding of the two leg pipes are located at the two ends of the synchronous connecting rod, and a user can operate the locking assemblies to unlock or lock relative sliding of the two leg pipes while holding the two ends of the synchronous connecting rod with the two hands; shear force can be resisted while the lengths of the two telescopic chair legs are synchronously adjusted, so that the lengths of the telescopic chair legs are conveniently adjusted, and the stability and the structural strength of the chair leg structure are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of folding chairs, and in particular to a chair leg structure. Background Art

[0002] A folding chair is designed for easy portability and storage. Its foldable structure and seat fabric allow it to be unfolded for lounging or sitting, or folded up, saving space and making it easy to carry and store. Folding chairs are widely used in a variety of situations, including outdoor activities, emergency rescues, temporary seating, camping, and travel.

[0003] However, existing folding chairs have the following drawbacks: Most folding chairs have fixed leg lengths, making it impossible to adjust the leg length to adjust the seat unit to different heights above the ground, making it difficult to meet the chair height requirements of users of different heights. A small number of folding chairs have adjustable leg lengths, but each leg is adjusted independently. Users need to adjust each leg length sequentially, which is cumbersome and creates a poor user experience. For example, Chinese utility model patent CN220124305U discloses a folding chair that "adds a telescopic assembly to each leg, connected by a locking assembly, and adjusts the relative position of the adjustment rod and the leg to adjust the seat assembly to a suitable reclining height according to the user's needs, thereby improving user comfort." In this folding chair, each leg is independently adjustable. Users need to sequentially unlock, adjust, and lock each leg to adjust the leg length, a cumbersome process that can easily lead to inconsistent leg lengths and the need for multiple leg adjustments. Summary of the Invention

[0004] One object of the present application is to provide a chair leg structure with a stable structure and convenient length adjustment.

[0005] To achieve the above purpose, the technical solution adopted in this application is: a chair leg structure, including two telescopic chair legs arranged opposite to each other, the telescopic chair legs including at least two leg tubes slidably connected to each other, the leg tubes are provided with locking components for locking the sliding of adjacent leg tubes, a synchronous connecting rod is provided between one of the leg tubes of the telescopic chair legs and one of the leg tubes of the other telescopic chair legs, and the locking components are located at both ends of the synchronous connecting rod.

[0006] Preferably, the locking assembly includes a locking pin and an elastic member, one end of the locking pin is toward the end of the synchronization link and is connected to the elastic member, and the elastic member is suitable for pushing the locking pin so that the locking pin slides in a direction away from the synchronization link to lock the two adjacent leg tubes.

[0007] As another preferred embodiment, the telescopic chair leg includes a first leg tube and a second leg tube that are socketed with each other, and a limiting structure is provided on the second leg tube. The limiting structure is suitable for limiting the sliding limit position of the first leg tube relative to the second leg tube, and the limiting structure is provided above the middle of the second leg tube.

[0008] Further preferably, the second leg tube is located below the first leg tube, and the second leg tube is sleeved on the outside of the first leg tube. The limiting structure includes a limiting slide groove arranged on the second leg tube, and the limiting slide groove extends along the length direction of the second leg tube. The end of the synchronization connecting rod passes through the limiting slide groove and is fixedly connected to the first leg tube. The second leg tube is sleeved on the outside of the first leg tube. The inner diameter of the second leg tube is larger than the outer diameter of the first leg tube. The thin top and thick bottom setting can improve the force stability of the telescopic chair legs.

[0009] Furthermore, the first leg tube can slide relative to the second leg tube so that the end of the synchronous connecting rod abuts against the groove wall of the limiting sliding groove.

[0010] Furthermore, the second leg tube is located below the first leg tube, and the second leg tube is sleeved in the first leg tube. A pipe sleeve is provided between the first leg tube and the synchronous connecting rod. The two ends of the pipe sleeve are fixedly connected to the first leg tube and the synchronous connecting rod by a first fastener and a second fastener respectively. The limiting structure includes a limiting slide groove provided on the second leg tube, and the first fastener is provided in the limiting slide groove. The first leg tube can slide relative to the second leg tube so that the first fastener abuts against the groove wall of the limiting slide groove, thereby limiting the sliding limit position of the first leg tube relative to the second leg tube.

[0011] Furthermore, the locking pin and the elastic member are arranged in the first leg tube, and a locking hole is opened on the first leg tube. The elastic member is suitable for pushing the locking pin through the locking hole and protruding out of the first leg tube to lock the second leg tube from sliding relative to the first leg tube. Under the action of external force, the locking pin can be squeezed into the first leg tube to unlock the second leg tube.

[0012] Furthermore, the locking assembly also includes a mounting seat, which is arranged at the end of the synchronization link, and the locking pin is movably arranged in the mounting seat, one end of the elastic member is connected to the mounting seat, and the other end of the elastic member is connected to the locking pin, and a card hole is opened on the first leg tube, and the elastic member is suitable for pushing the locking pin through the card hole and protruding out of the first leg tube to lock the second leg tube from sliding relative to the first leg tube. Under the action of external force, the locking pin can be squeezed into the mounting seat to unlock the second leg tube.

[0013] Furthermore, an operating rod is provided on the locking pin, and corresponding first sliding grooves and second sliding grooves are respectively provided on the mounting seat and the pipe sleeve. The operating rod is slidably set in the first sliding groove and the second sliding groove, and the operating rod can slide along the first sliding groove and the second sliding groove to drive the locking pin to slide and retract into the mounting seat.

[0014] Furthermore, the second leg tube is provided with a plurality of positioning holes, each of which is spaced apart along the length direction of the second leg tube, and the locking pin is adapted to selectively cooperate with each of the positioning holes to lock the telescopic chair leg at different length positions.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] In the chair leg structure of the present application, a synchronous connecting rod is provided between the leg tubes of the two telescopic chair legs, and the locking components for locking the two leg tubes from sliding relative to each other are located at both ends of the synchronous connecting rod. The user can hold the two ends of the synchronous connecting rod with both hands and operate the locking components to unlock or lock the relative sliding of the two leg tubes. The length of the two telescopic chair legs can be adjusted synchronously while resisting shear force, which facilitates the adjustment of the length of the telescopic chair legs and ensures the stability and structural strength of the chair leg structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of embodiment 1 of the chair leg structure of this application.

[0018] Figure 2 This is a cross-sectional schematic diagram of the first leg tube, the second leg tube and the synchronous connecting rod in Example 1 of the chair leg structure of this application.

[0019] Figure 3 This is a schematic diagram of the limiting structure in Example 1 of the chair leg structure of this application.

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of embodiment 2 of the chair leg structure of this application.

[0021] Figure 5 This is a schematic diagram of the limiting structure in Example 2 of the chair leg structure of this application.

[0022] Figure 6 This is a cross-sectional schematic diagram of the first leg tube, the second leg tube and the synchronous connecting rod in Example 2 of the chair leg structure of this application.

[0023] Figure 7 This is an exploded view of the pipe sleeve and locking assembly in Example 2 of the chair leg structure of this application.

[0024] Figure 8 This is a schematic diagram of the three-dimensional structure of the folding chair of this application.

[0025] In the figure: 100, first leg tube; 110, clamping hole; 200, second leg tube; 210, positioning hole; 300, locking assembly; 310, locking pin; 320, elastic member; 330, mounting seat; 340, operating rod; 350, first slide groove; 400, synchronous connecting rod; 500, limiting structure; 510, limiting slide groove; 600, pipe sleeve; 610, first fastener; 620, second fastener; 630, second slide groove. DETAILED DESCRIPTION

[0026] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0029] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0030] like Figure 1-8 As shown, the present application provides a chair leg structure and a folding chair.

[0031] Among them, the chair leg structure includes two telescopic chair legs arranged opposite to each other, and the telescopic chair legs include at least two leg tubes that are slidably connected to each other. A locking component 300 is provided on the leg tube to lock the sliding of the other adjacent leg tube. A synchronous link 400 is provided between the leg tube in one telescopic chair leg and the leg tube in the other telescopic chair leg. The locking component 300 is located at both ends of the synchronous link 400, so that the user can operate the locking component 300 while holding the synchronous link 400 with both hands, which simplifies the length adjustment steps of the telescopic chair legs and adjusts the length of the two telescopic chair legs synchronously, avoiding the need to adjust the telescopic chair legs multiple times; in addition, the synchronous link 400 can also resist the shear force generated by the sliding of the leg tubes in the two telescopic chair legs, thereby ensuring the stability and structural strength of the chair leg structure.

[0032] exist Figure 1-3 In the illustrated embodiment, the telescopic chair leg includes a first leg tube 100 and a second leg tube 200 that are slidably connected to each other. The second leg tube 200 is located below the first leg tube 100 and is connected to the outside of the first leg tube 100. The two ends of the synchronization link 400 are respectively connected to the first leg tube 100 of the two telescopic chair legs. A limiting structure 500 is provided on the second leg tube 200. The limiting structure 500 is suitable for limiting the sliding limit position of the first leg tube 100 relative to the second leg tube 200. Specifically, the limiting structure 500 is implemented as a limiting slide groove 510, which extends along the length direction of the second leg tube 200 and is arranged on the inner end face of the second leg tube 200. The limiting slide groove 510 is located in the upper middle part of the second leg tube 200, and the end of the synchronization link 400 passes through the limiting slide groove 510 and is fixedly connected to the first leg tube 100. Then, when the first leg tube 100 slides relative to the second leg tube 200, the end of the synchronization link 400 slides in the limiting slide groove 510 and abuts against the upper groove wall or the lower groove wall of the limiting slide groove 510, thereby limiting the lowest sliding position and the highest sliding position of the first leg tube 100. When the first leg tube 100 is at the lowest sliding position, the length of the telescopic chair leg is the longest, and when the first leg tube 100 is at the highest sliding position, the length of the telescopic chair leg is the shortest. Since the limiting slide groove 510 is set in the middle and upper part of the second leg tube 200, no matter whether the first leg tube 100 slides to the lowest sliding position or the highest sliding position, the synchronization link 400 is always in the middle section of the telescopic chair leg. The user can operate the locking assembly 300 and the synchronization link 400 in a comfortable range to adjust the length of the telescopic chair leg.

[0033] The second leg tube 200 is also provided with a plurality of positioning holes 210 on its outer end surface. Each positioning hole 210 is spaced apart along the length of the second leg tube 200. The position of each positioning hole 210 corresponds to the position of the limiting slide groove 510. When the first leg tube 100 slides between the lowest sliding position and the highest sliding position, the locking assembly 300 can selectively engage with each positioning hole 210 to lock the first leg tube 100 from sliding relative to the second leg tube 200. The locking assembly 300 includes a locking pin 310 and an elastic member 320. One end of the locking pin 310 faces the end of the synchronization link 400 and is connected to the elastic member 320. The elastic member 320 is adapted to push the locking pin 310, causing the locking pin 310 to slide away from the synchronization link 400 to engage with the positioning hole 210.

[0034] Furthermore, if Figure 2 As shown, the elastic member 320 is disposed within the first leg tube 100. The elastic member 320 has a V-shaped structure and includes a first spring sheet and a second spring sheet integrally formed and connected. The locking pin 310 is fixedly connected to the end of the first spring sheet. A locking hole 110 is defined on the outer end surface of the first leg tube 100, and the shape of the locking hole 110 matches the shape of the locking pin 310. When the elastic member 320 and the locking pin 310 are placed within the first leg tube 100, the second spring sheet is fixedly connected to the first leg tube 100. The first and second spring sheets push the locking pin 310 through the locking hole 110 and protrude out of the outer end surface of the first leg tube 100. The locking pin 310 then engages the positioning hole 210 on the second leg tube 200, thereby preventing the first and second leg tubes 100 and 200 from sliding relative to each other. When the lock needs to be released, the locking pin 310 can be squeezed and compressed into the first leg tube 100 under the action of external force and separated from the positioning hole 210 , and the first leg tube 100 can slide relative to the second leg tube 200 .

[0035] That is to say, the user can hold the two ends of the synchronization link 400 with both hands and squeeze the locking pin 310 to retract it into the first leg tube 100, and then move the synchronization link 400 upward or downward to make the first leg tube 100 slide relative to the second leg tube 200 to extend or shorten the telescopic chair leg. When the first leg tube 100 slides relative to the second leg tube 200 until the locking pin 310 is aligned with the positioning hole 210, the locking pin 310 is automatically embedded in the positioning hole 210 under the push of the elastic member 320 to lock the first leg tube 100 and the second leg tube 200.

[0036] exist Figure 4-7In the illustrated embodiment, the telescopic chair leg comprises a first leg tube 100 and a second leg tube 200 that are slidably coupled to each other. The second leg tube 200 is positioned below and sleeved within the first leg tube 100. A synchronization link 400 is connected at both ends to the first leg tube 100 of each telescopic chair leg. A sleeve 600 is disposed between the first leg tube 100 and the synchronization link 400. The sleeve 600's ends are connected to the first leg tube 100 and the synchronization link 400, respectively. The sleeves 600's ends are fixedly connected to the first leg tube 100 and the synchronization link 400, respectively, by first and second fasteners 610 and 620. The first and second fasteners 610 and 620 can be conventionally configured as rivets. A limit structure 500 is disposed on the second leg tube 200 to limit the sliding limit position of the first leg tube 100 relative to the second leg tube 200.

[0037] Specifically, the limiting structure 500 is implemented as a limiting slide groove 510, which extends along the length direction of the second leg tube 200 and passes through the front end face and the rear end face of the second leg tube 200. The limiting slide groove 510 is located in the upper middle part of the second leg tube 200, and the first fastener 610 connecting the pipe sleeve 600 and the first leg tube 100 is located in the limiting slide groove 510. When the first leg tube 100 slides relative to the second leg tube 200, the first fastener 610 slides in the limiting slide groove 510 and abuts against the upper groove wall or the lower groove wall of the limiting slide groove 510, thereby limiting the lowest sliding position and the highest sliding position of the first leg tube 100. Since the limiting slide groove 510 is set in the middle and upper part of the second leg tube 200, no matter whether the first leg tube 100 slides to the lowest sliding position or the highest sliding position, the synchronization link 400 is always in the middle section of the telescopic chair leg. The user can operate the locking assembly 300 and the synchronization link 400 within a comfortable range to adjust the length of the telescopic chair leg.

[0038] A plurality of positioning holes 210 are provided on the inner end surface of the second leg tube 200. Each positioning hole 210 is spaced apart along the length of the second leg tube 200. The position of each positioning hole 210 corresponds to the position of the limiting slide groove 510. When the first leg tube 100 slides between the lowest sliding position and the highest sliding position, the locking assembly 300 can selectively engage with each positioning hole 210 to lock the first leg tube 100 from sliding relative to the second leg tube 200. The locking assembly 300 includes a locking pin 310 and an elastic member 320. One end of the locking pin 310 faces the end of the synchronization link 400 and is connected to the elastic member 320. The elastic member 320 is adapted to push the locking pin 310, causing the locking pin 310 to slide away from the synchronization link 400 to engage with the positioning hole 210.

[0039] Furthermore, if Figure 6-7As shown, the locking assembly 300 further includes a mounting seat 330, which is disposed at the end of the synchronization link 400. The mounting seat 330 defines a receiving cavity with one end open, the open end of the mounting seat 330 facing the first leg tube 100. A locking pin 310 is movably disposed within the receiving cavity. An elastic member 320, implemented as a compression spring, is disposed within the receiving cavity. One end of the elastic member 320 is connected to the mounting seat 330, and the other end of the elastic member 320 is connected to the locking pin 310. The elastic member 320 is adapted to push the locking pin 310, causing it to slide out of the receiving cavity. A locking hole 110 is defined on the inner end surface of the first leg tube 100. The shape of the locking hole 110 matches that of the locking pin 310. The locking pin 310 can then pass through the locking hole 110, extend into the first leg tube 100, and engage with the positioning hole 210 on the second leg tube 200, thereby locking the first leg tube 100 and the second leg tube 200. An operating rod 340 is also provided on the locking pin 310, and a first sliding groove 350 and a second sliding groove 630 corresponding to each other are respectively provided on the mounting seat 330 and the pipe sleeve 600. The operating rod 340 is slidably set in the first sliding groove 350 and the second sliding groove 630, and then the operating rod 340 can slide in the first sliding groove 350 and the second sliding groove 630 to drive the locking pin 310 to retract into the mounting seat 330, so that the locking pin 310 is separated from the positioning hole 210, and the first leg tube 100 can slide relative to the second leg tube 200.

[0040] That is to say, the user can hold the two ends of the synchronization link 400 with both hands and pull the operating rod 340 to retract the locking pin 310 into the mounting seat 330 and separate it from the positioning hole 210, and then move the synchronization link 400 upward or downward to make the first leg tube 100 slide relative to the second leg tube 200 to extend or shorten the telescopic chair leg. When the first leg tube 100 slides relative to the second leg tube 200 until the locking pin 310 is aligned with the positioning hole 210, the user releases the operating rod 340, and the locking pin 310 is automatically embedded in the positioning hole 210 under the push of the elastic member 320, thereby locking the first leg tube 100 and the second leg tube 200.

[0041] like Figure 8 As shown, the present application also provides a folding chair, comprising a seat structure, a backrest structure, two armrest structures, and the two aforementioned leg structures. The backrest structure is pivotally connected to the rear of the seat structure. The two leg structures are arranged front and rear and pivotally connected to the seat structure to form front and rear legs. The two armrest structures are respectively mounted above the leg structures and pivotally connected to the left and right sides of the backrest structure. The front and rear legs can be independently adjusted in length, and the front and rear legs can be adjusted to different positions, allowing the folding chair to be switched into different configurations, such as a recliner or a seat.

[0042] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A chair leg structure, characterized in that: The invention comprises two telescopic chair legs arranged opposite to each other, wherein the telescopic chair legs comprise at least two leg tubes slidably sleeved with each other, and the leg tubes are provided with locking components for locking the sliding of adjacent leg tubes. A synchronous connecting rod is provided between the leg tubes of one of the telescopic chair legs and the leg tubes of the other telescopic chair leg, and the locking components are located at both ends of the synchronous connecting rod.

2. The chair leg structure according to claim 1, characterized in that: The locking assembly includes a locking pin and an elastic member, one end of the locking pin is toward the end of the synchronization link and is connected to the elastic member, and the elastic member is suitable for pushing the locking pin so that the locking pin slides in a direction away from the synchronization link to lock the two adjacent leg tubes.

3. The chair leg structure according to claim 2, wherein: The telescopic chair leg includes a first leg tube and a second leg tube that are socketed with each other. A limiting structure is provided on the second leg tube. The limiting structure is suitable for limiting the sliding limit position of the first leg tube relative to the second leg tube. The limiting structure is provided above the middle of the second leg tube.

4. The chair leg structure according to claim 3, characterized in that: The second leg tube is located below the first leg tube, and the second leg tube is sleeved on the outside of the first leg tube. The limiting structure includes a limiting slide groove arranged on the second leg tube, and the limiting slide groove extends along the length direction of the second leg tube. The end of the synchronous connecting rod passes through the limiting slide groove and is fixedly connected to the first leg tube. The second leg tube is sleeved on the outside of the first leg tube. The inner diameter of the second leg tube is larger than the outer diameter of the first leg tube. The thin top and thick bottom setting can improve the force stability of the telescopic chair legs.

5. The chair leg structure according to claim 4, characterized in that: The first leg tube can slide relative to the second leg tube so that the end of the synchronous connecting rod abuts against the groove wall of the limiting sliding groove.

6. The chair leg structure according to claim 3, wherein: The second leg tube is located below the first leg tube, and the second leg tube is sleeved in the first leg tube. A pipe sleeve is provided between the first leg tube and the synchronous connecting rod. The two ends of the pipe sleeve are fixedly connected to the first leg tube and the synchronous connecting rod by a first fastener and a second fastener respectively. The limiting structure includes a limiting slide groove provided on the second leg tube, and the first fastener is provided in the limiting slide groove. The first leg tube can slide relative to the second leg tube so that the first fastener abuts against the groove wall of the limiting slide groove, thereby limiting the sliding limit position of the first leg tube relative to the second leg tube.

7. The chair leg structure according to claim 4, wherein: The locking pin and the elastic member are arranged in the first leg tube. A locking hole is opened on the first leg tube. The elastic member is suitable for pushing the locking pin through the locking hole and protruding out of the first leg tube to lock the second leg tube from sliding relative to the first leg tube. Under the action of external force, the locking pin can be squeezed into the first leg tube to unlock the second leg tube.

8. The chair leg structure according to claim 6, wherein: The locking assembly also includes a mounting seat, which is arranged at the end of the synchronization connecting rod. The locking pin is movably arranged in the mounting seat. One end of the elastic member is connected to the mounting seat, and the other end of the elastic member is connected to the locking pin. A card hole is opened on the first leg tube, and the elastic member is suitable for pushing the locking pin through the card hole and protruding from the first leg tube to lock the second leg tube from sliding relative to the first leg tube. Under the action of external force, the locking pin can be squeezed into the mounting seat to unlock the second leg tube.

9. The chair leg structure according to claim 8, wherein: An operating rod is provided on the locking pin, and corresponding first and second sliding grooves are provided on the mounting seat and the pipe sleeve respectively. The operating rod is slidably set in the first and second sliding grooves, and the operating rod can slide along the first and second sliding grooves to drive the locking pin to slide and retract into the mounting seat.

10. The chair leg structure according to any one of claims 7 to 9, characterized in that: The second leg tube is further provided with a plurality of positioning holes, each of which is spaced apart along the length direction of the second leg tube. The locking pin is adapted to selectively cooperate with each of the positioning holes to lock the telescopic chair legs at different length positions.

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