Locking mechanism and folding chair with same
By designing the sliding channel and locking components of the locking mechanism, the problem of the armrest easily detaching from the vertical bar was solved, achieving a stable connection between the armrest and the vertical bar, and improving the safety and ease of operation of the folding chair.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG SENYING LEISURE PROD CO LTD
- Filing Date
- 2024-12-24
- Publication Date
- 2026-04-24
AI Technical Summary
The armrests and vertical bars of existing folding chairs are easily detached due to accidental contact, causing the chair to fold unexpectedly, which is not safe.
A locking mechanism was designed, including a locking sleeve and a fastener. The locking and unlocking of the handrail and the vertical bar are achieved through the sliding connection of the sliding channel and the locking element, ensuring a stable connection between the handrail and the vertical bar.
It improves the safety of folding chairs, prevents armrests from accidentally detaching, and is simple and convenient to operate, thus enhancing its practicality.
Smart Images
Figure CN224155347U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of folding chairs, and more particularly to a locking mechanism and a folding chair equipped with the mechanism. Background Technology
[0002] Since its invention, the folding chair has gained popularity due to its lightweight structure, stackability, and ease of movement and storage. It has found widespread use, from picnics and barbecues to leisure fishing and everyday home life. The structure of the folding chair has also been continuously improved, from the initial simple stools to today's chairs with armrests and backrests. However, with the increasing functionality, the folding mechanism urgently needs improvement.
[0003] Common folding chairs typically use a crossbar assembly to hinge two adjacent vertical bars, allowing the two bars to move closer together for folding and to move further apart for unfolding. The armrests of the folding chair then secure the two vertical bars in the unfolded state, keeping the chair in its unfolded position. However, currently on the market, the armrests of folding chairs are often only secured to the vertical bars by interlocking them, making it easy for the armrests to detach from the vertical bars due to accidental contact, leading to the chair being folded unintentionally and causing inconvenience. Summary of the Invention
[0004] This utility model addresses the shortcomings of existing technologies by providing a locking mechanism and a folding chair equipped with the mechanism. The locking mechanism can lock the armrests and the vertical bar together, thereby preventing the armrests from detaching from the vertical bar due to accidental contact, thus preventing the folding chair from being folded accidentally. It is highly safe, simple to operate, and practical.
[0005] This utility model provides a locking mechanism, which includes a locking sleeve arranged on a handrail and a fastening member arranged on a vertical rod. The locking sleeve has a connecting channel recessed from the bottom upward for the fastening member to extend into. The side wall of the locking sleeve has a sliding channel communicating with the connecting channel. A locking member is provided on the sliding channel. The locking member includes a locking body slidably connected to the sliding channel and an operating part provided on the side of the locking body. The locking body has a locking channel extending longitudinally for the fastening member to pass through. The locking body has a locking part arranged along the side wall of the locking channel. The operating part extends out of the locking sleeve.
[0006] The fastening member includes a fastening body and a first fastening part disposed on the side of the fastening body. The locking member can slide along the sliding channel between a locked position and an unlocked position. When the locking member is in the locked position, the first fastening part is limited to the upper side of the locking part. When the locking member is in the unlocked position, the fastening member can pass through the locking channel and extend into the connecting channel or extend out of the connecting channel.
[0007] Preferably, the sliding channel is formed by a recess in the inner wall of the locking sleeve and is arranged around the connecting channel. The length direction of the sliding channel is arranged radially along the locking sleeve, and one end of the sliding channel in the length direction is set as a closed structure, while the other end of the sliding channel in the length direction is set as an open channel penetrating the side wall of the locking sleeve. The operating part extends out of the open channel.
[0008] Preferably, the outer wall of the locking sleeve is provided with a hook along the length of the sliding channel, and the operating part includes an operating body and a limiting plate disposed on the operating body. The movement of the locking member toward the opening channel is limited by the limiting plate engaging with the hook.
[0009] Preferably, the latching member includes two extension rods extending outward from the outer wall of the locking sleeve along the length of the sliding channel, and two latching portions protruding from opposite sides of the two extension rods. The operating body extends outward from the locking body, and the limiting plate extends downward from the operating body. A positioning channel extending upward from the bottom of the limiting plate is provided through the limiting plate along the length of the sliding channel. The extension rods are arranged in the positioning channel and can move relative to the positioning channel along the length of the sliding channel. The operating part also includes an operating plate extending downward from the operating body. The operating plate is spaced apart on the side of the limiting plate away from the locking sleeve, and a limiting cavity is formed between the operating plate and the limiting plate for the latching portions to move inward along the length of the sliding channel. The movement of the locking member towards the open channel is limited by the engagement connection between the limiting plate and the latching portions. The movement of the locking member towards the closed structure is limited by the abutment between the operating plate and the latching portions.
[0010] Preferably, an elastic reset member for keeping the locking member in the locked position is further provided between the locking body and the locking sleeve. The elastic reset member is arranged between the locking body and the locking sleeve on the side of the locking body closer to the operating part, and the locking part is arranged on the side of the locking body away from the operating part.
[0011] Preferably, the locking sleeve has a recessed mounting groove along the length of the sliding channel from its outer side wall, and the mounting groove is arranged on the upper side of the opening channel and communicates with the opening channel and the sliding channel. The upper side of the locking body is also provided with a locking abutment block corresponding to the mounting groove. The elastic reset member is arranged between the locking abutment block and the mounting groove. The locking abutment block can move along the mounting groove as the locking member slides relative to the sliding channel.
[0012] Preferably, the side wall of the fastening member is recessed with a locking groove arranged around the fastening member for cooperating with the locking part. The upper wall of the locking groove forms the first fastening part, and the lower wall forms the second fastening part. When the locking member is in the locked position, the locking part can be limited to the upper side of the second fastening part. The inner side wall of the locking groove abuts against the locking part to restrict the movement of the locking member along the sliding channel.
[0013] Preferably, the top perimeter of the fastener is provided as an arc-shaped guide surface one, the middle perimeter of the fastener is provided as an arc-shaped guide surface two, and the cross-sectional width of the upper end of the arc-shaped guide surface one is smaller than the cross-sectional width of the upper end of the arc-shaped guide surface two, and the locking groove is provided below the arc-shaped guide surface two.
[0014] Preferably, the lower part of the fastener is provided with a first mounting structure, which is configured as a sleeve structure for being fitted inside or outside the vertical rod;
[0015] The upper part of the locking sleeve is provided with a second mounting structure, and a first fastening channel is provided through the second mounting structure. The handrail is provided with a second fastening channel corresponding to the first fastening channel. The locking sleeve and the handrail are connected by fasteners in the first and second fastening channels. The first fastening channel is connected to a connecting channel, and the connecting channel forms an operation channel for assembling or disassembling the fasteners.
[0016] This utility model also provides a folding chair, including the above-mentioned locking mechanism and four vertical rods, a scissor lift assembly movably connected between two adjacent vertical rods, and an armrest arranged between two front and rear vertical rods. The rear end of the armrest is hinged to a rear vertical rod, and the front end of the armrest is connected to the upper end of a front vertical rod through the locking mechanism.
[0017] This utility model provides a locking mechanism, including a locking sleeve disposed on an armrest and a fastening member disposed on a vertical rod. It can lock the armrest and the vertical rod together, thereby preventing the armrest from detaching from the vertical rod due to accidental contact, thus preventing the folding chair from being accidentally folded, ensuring high safety. The locking sleeve has a connecting channel recessed from the bottom upwards for the fastening member to insert into. By driving the locking member to slide along the sliding channel within the locking sleeve from the locked position to the unlocked position, the locking channel aligns with the connecting channel, and the fastening member extends into the connecting channel and the locking channel, driving the locking member to slide along the sliding channel within the locking sleeve. The moving channel slides from the unlocked position to the locked position, limiting the first engaging part of the fastener to the upper side of the locking part of the locking member, thus realizing the quick connection and locking of the handrail and the vertical bar. By moving the operating component, the locking member slides along the sliding channel inside the locking sleeve from the locked position to the unlocked position, so that the locking channel corresponds to the connecting channel. By holding the handrail and lifting it, the fastener is pulled out of the connecting channel and the locking channel, thus realizing the quick disassembly of the handrail and the vertical bar. This allows the handrail and the vertical bar to be quickly disassembled and locked, which is more convenient, simple to operate, and practical than the original locking method.
[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0020] Figure 1 This is a partially enlarged view of the locking mechanism of the first embodiment of this utility model.
[0021] Figure 2 This is a schematic diagram of the locking mechanism of the first embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram of the locking sleeve of the locking mechanism in the first embodiment of the present invention. Figure 1 .
[0023] Figure 4 This is a schematic diagram of the locking sleeve of the locking mechanism in the first embodiment of the present invention. Figure 2 .
[0024] Figure 5 This is a schematic diagram of the locking member of the locking mechanism in the first embodiment of the present invention. Figure 1 .
[0025] Figure 6 This is a schematic diagram of the locking member of the locking mechanism in the first embodiment of the present invention. Figure 2 .
[0026] Figure 7 This is a schematic diagram of the fastening component of the locking mechanism in the first embodiment of this utility model.
[0027] Figure 8 This is a structural schematic diagram of a folding chair according to the second embodiment of the present invention.
[0028] Figure 9 This is a cross-sectional view of a folding chair according to the second embodiment of the present invention. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.
[0034] like Figures 1-7As shown, as a first embodiment of the present invention, a locking mechanism is provided, which includes a locking sleeve 2 arranged on a handrail 1 and a fastening member 4 arranged on a vertical rod 3. The locking sleeve 2 is recessed from the bottom upward with a connecting channel 21 for the fastening member 4 to extend into. The side wall of the locking sleeve 2 is provided with a sliding channel 22 communicating with the connecting channel 21. A locking member 23 is provided on the sliding channel 22. The locking member 23 includes a locking body 231 slidably connected to the sliding channel 22 and an operating part 232 provided on the side of the locking body 231. The locking body 231 is provided with a locking channel 233 through which the fastening member 4 passes in the longitudinal direction. The locking body 231 has a locking part 239 arranged along the side wall of the locking channel 233. The operating part 232 extends out of the locking sleeve 2. The fastening member 4 includes a fastening body 41 and a fastening part 42 disposed on the side of the fastening body 41. The locking member 23 can slide along the sliding channel 22 between the locked position and the unlocked position. When the locking member 23 is in the locked position, the fastening part 42 is limited to the upper side of the locking part 239. When the locking member 23 is in the unlocked position, the fastening member 4 can pass through the locking channel 233 and extend into the connecting channel 21 or extend out of the connecting channel 21, which facilitates the fastening of the fastening member 4 and the locking sleeve 2. It can lock the armrest 1 and the vertical bar 3 together, thereby preventing the armrest 1 from detaching from the vertical bar 3 due to accidental contact, thus preventing the folding chair from being folded accidentally. It has high safety. The locking sleeve 2 has a connecting channel 21 recessed from the bottom upward for the fastening member 4 to extend into. By driving the locking member 23 to slide along the sliding channel 22 in the locking sleeve 2 from the locked position to the unlocked position, the locking channel is opened. The locking channel 233 corresponds to the connecting channel 21, and the fastening member 4 is inserted into the connecting channel 21 and the locking channel 233. The locking member 23 is driven to slide from the unlocked position to the locked position along the sliding channel 22 in the locking sleeve 2, so that the first fastening part 431 of the fastening member 4 is limited to the upper side of the locking part 239 of the locking member 23, thereby realizing the quick connection and locking of the handrail 1 and the vertical rod 3. By moving the operating member, the locking member 23 is driven to slide from the locked position to the unlocked position along the sliding channel 22 in the locking sleeve 2, so that the locking channel 233 corresponds to the connecting channel 21. By holding the handrail 1 and lifting it up, the fastening member 4 is pulled out of the connecting channel 21 and the locking channel 233, thereby realizing the quick disassembly of the handrail 1 and the vertical rod 3. The handrail 1 and the vertical rod 3 can be quickly disassembled and locked. Compared with the original locking method, it is more convenient, simple to operate, and has good practicality.
[0035] like Figure 2 and Figure 4As shown, the sliding channel 22 is formed by a recess in the inner wall of the locking sleeve 2 and is arranged around the connecting channel 21. The length direction of the sliding channel 22 is arranged radially along the locking sleeve 2, and one end of the sliding channel 22 in the length direction is set as a closed structure, while the other end of the sliding channel 22 in the length direction is set as an open channel 24 that penetrates the side wall of the locking sleeve 2. The operating part 232 extends out of the open channel 24 to facilitate the sliding of the locking member 23 in the sliding channel 22. The operating part 232 extends out of the open channel 24 to facilitate user operation and increase practicality.
[0036] like Figures 2-3 and Figure 9 As shown, the outer wall of the locking sleeve 2 is provided with a hook 25 along the length of the sliding channel 22. The operating part 232 includes an operating body 234 and a limiting plate 235 provided on the operating body 234. The movement of the locking member 23 toward the opening channel 24 is limited by the engagement of the limiting plate 235 with the hook 25. The engagement of the hook and the limiting plate 235 limits the locking member 23 as a whole. The operation is simple and the practicality is increased.
[0037] like Figures 2-6 and Figure 9 As shown, the latch 25 includes two extension rods 251 extending outward from the outer wall of the locking sleeve 2 along the length of the sliding channel 22, and two latch portions 252 protruding from opposite sides of the two extension rods 251. The operating body 234 extends outward from the locking body 231, and the limiting plate 235 extends downward from the operating body 234. A positioning channel 236 extending upward from the bottom of the limiting plate 235 is provided through the limiting plate 235 along the length of the sliding channel 22. The extension rods 251 are arranged in the positioning channel 236 and can move relative to the positioning channel 236 along the length of the sliding channel 22. The operating part 232 also includes an operating plate 237 extending downward from the operating body 234. The 37 parts are spaced apart on the side of the limiting plate 235 away from the locking sleeve 2, and a limiting cavity 238 is formed between the operating plate 237 and the limiting plate 235 for the hook part 252 to move inward along the length direction of the sliding channel 22. The movement of the locking member 23 towards the opening channel 24 is limited by the engagement of the limiting plate 235 with the hook part 252. The movement of the locking member 23 towards the closed structure is limited by the abutment of the operating plate 237 with the hook part 252. By the movement and limitation of the locking member 23 in the limiting cavity 238, the locking mechanism can switch between the locked state and the unlocked state. The state switching can be achieved by a small amount of use of the operating member, which is convenient, quick and practical, not easy to jam and has strong stability.
[0038] like Figures 3-6 and Figure 9As shown, an elastic reset member 5 is also provided between the locking body 231 and the locking sleeve 2 to keep the locking member 23 in the locked position. The elastic reset member 5 is arranged between the locking body 231 and the locking sleeve 2 on the side of the locking body 231 near the operating part 232. The locking part 239 is arranged on the side of the locking body 231 away from the operating part 232. The elastic reset member 5 rebounds the locking member 23 after the operating part 232 is pressed, so that it returns to the stage where the limiting plate 235 and the hook part 252 are engaged and limited.
[0039] like Figure 3 As shown, the locking sleeve 2 has a recessed mounting groove 51 along the length of the sliding channel 22 from its outer side wall. The mounting groove 51 is arranged on the upper side of the opening channel 24 and is connected to the opening channel 24 and the sliding channel 22. The upper side of the locking body 231 is also provided with a locking abutment block 52 corresponding to the mounting groove 51. The elastic reset member 5 is arranged between the locking abutment block 52 and the mounting groove 51. The elastic reset member 5 releases elastic stress after contraction to push the locking abutment block 52, so that the locking abutment block 52 can move along the mounting groove 51 with the sliding of the locking member 23 relative to the sliding channel 22. This can save the user the time of manually removing the operating part 232, and can automatically return to the initial state quickly and easily. It is simple, convenient and has strong practicality.
[0040] like Figure 7 As shown, the side wall of the fastener 4 is recessed with a locking groove 43 arranged around the fastener 4 for cooperating with the locking part 239. The upper wall of the locking groove 43 forms the first fastening part 431, and the lower wall forms the second fastening part 432. When the locking member 23 is in the locked position, the locking part 239 can be limited to the upper side of the second fastening part 432. The inner side wall of the locking groove 43 abuts against the locking part 239 to restrict the movement of the locking member 23 along the sliding channel 22. The locking sleeve 2 and the fastener 4 are locked by the abutment between the locking part 239 and the locking groove 43, so that the handrail 1 is also fixed to the vertical bar 3 in the locked state, which is not easy to shake or fall off. The structure is simple, quick and stable.
[0041] like Figure 7 As shown, the top perimeter of the fastener 4 is provided with an arc-shaped guide surface 44, and the perimeter of the middle of the fastener 4 is provided with an arc-shaped guide surface 45. The cross-sectional width of the upper end of the arc-shaped guide surface 44 is smaller than that of the upper end of the arc-shaped guide surface 45, so that the overall fastener 4 presents a structure that is smaller at the top and larger at the bottom. The locking groove 43 is located below the arc-shaped guide surface 45. Through the arc-shaped guide surface 44 and the arc-shaped guide surface 45, the handrail 1 can be directly adjusted to be roughly aligned with the position of the fastener 4 and pressed down. The locking and locking groove 43 are achieved by the sliding of the two guide surfaces with the connecting channel 21 and the locking channel 233, which completes the precise positioning, reduces the trouble of use, shortens the user's operation time, achieves quick locking, and greatly increases the practicality and convenience of the structure.
[0042] like Figure 1 and Figure 4 As shown, the lower part of the fastener 4 is provided with a first mounting structure 46. The first mounting structure 46 is configured as a sleeve structure 461 for being sleeved inside or outside the vertical rod 3. The sleeve structure 461 is provided with a sliding groove 462 and a sealing block 463. The sealing block 463 is arranged on the lower side of the second fastening part 432, arranged in multiple layers, and is smaller than the second fastening part 432 so that it can fit and seal with the inner wall of the vertical rod 3, thereby enhancing the friction between the fastener 4 and the vertical rod 3 and making it less likely to slip out of the inner wall of the vertical rod 3. The sliding groove 462 is arranged on the inner wall of the fastener 4 and is recessed inward. One or more of them can be arranged. The upper part of the locking sleeve 2 is provided with a second mounting structure 24, and a first fastening channel 241 is provided through the second mounting structure 24. The handrail 1 is provided with a second fastening channel 242 corresponding to the first fastening channel 241. The locking sleeve 2 and the handrail 1 are connected by fasteners in the first fastening channel 241 and the second fastening channel 242. The first fastening channel 241 is connected to the connecting channel 21. The connecting channel 21 forms an operating channel for assembling or disassembling the fasteners, which facilitates the connection between the locking sleeve 2 and the handrail 1.
[0043] In another embodiment, such as Figure 1 and Figures 8-9 As shown, a folding chair is characterized by comprising four vertical rods 3, scissor arms 6 movably connected between two adjacent vertical rods 3, and armrests 1 arranged between two front and rear vertical rods 3. The rear end of the armrest 1 is hinged to a rear vertical rod 3, and the front end of the armrest 1 is connected to the upper end of a front vertical rod 3 through a locking mechanism. The ends of two adjacent scissor arms 6 are rotatably connected to sliding sleeves 31, which are slidably fitted onto the vertical rods 3. When the folding chair is folded, pulling any scissor arm 6 causes the sliding sleeve 31 to slide along the vertical rod 3, causing the scissor arm 6 to rotate around the sliding sleeve 31 and fold together. The locking mechanism is then unlocked and the armrest 1 is lowered, completing the folding of the chair. The armrest 1 includes an armrest arm 11 and a rotating sleeve 12. The armrest arm 11 is hinged to the rotating sleeve 12 and connected to the vertical rod 3 through the rotating sleeve 12. When the folding chair is folded up, the rotating sleeve 12 is moved upward. After the scissor lift assembly 6 is folded up, the armrest arm 11 is rotated downward to fit against the vertical rod 3. The inner wall of the vertical rod 3 is provided with sliding protrusions 32 corresponding to the sliding grooves 462. The number of sliding protrusions 32 corresponds to the number of sliding grooves 462. A vertical extension rod 33 can be added inside the vertical rod 3. The outer wall of the vertical extension rod 33 is recessed with a sliding groove 331 corresponding to the sliding protrusions 32. The vertical rod 3 can be extended to make the chair surface balanced in different terrains.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
[0045] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.
Claims
1. A locking mechanism, characterized in that, This includes locking sleeves arranged on the handrails and fasteners arranged on the vertical bars, wherein: The locking sleeve has a connecting channel recessed from the bottom upward for the fastener to extend into. The side wall of the locking sleeve has a sliding channel communicating with the connecting channel. A locking member is provided on the sliding channel. The locking member includes a locking body that is slidably connected to the sliding channel and an operating part provided on the side of the locking body. The locking body has a locking channel that is longitudinally provided for the fastener to pass through. The locking body has a locking part arranged along the side wall of the locking channel. The operating part extends out of the locking sleeve. The fastening member includes a fastening body and a first fastening part disposed on the side of the fastening body. The side wall of the fastening member is recessed with a locking groove arranged around the fastening member for cooperating with a locking part. The upper wall of the locking groove forms the first fastening part, and the lower wall forms the second fastening part. When the locking member is in the locked position, the locking part is limited to the upper side of the second fastening part, and the inner side wall of the locking groove abuts against the locking part to restrict the circumferential movement of the locking member along the sliding channel. The first fastening part abuts against the locking part to restrict the axial upward movement of the fastening member. The lower part of the fastening component is provided with a first mounting structure, which is configured as a sleeve structure for being fitted inside or outside the vertical rod. The sleeve structure is provided with a sliding groove and a sealing block. The sealing block is arranged in multiple layers below the second fastening part and is smaller than the second fastening part so as to fit and seal against the inner wall of the vertical rod. The top of the fastener is provided with an arc-shaped guide surface one, and the middle part of the fastener is provided with an arc-shaped guide surface two. The cross-sectional width of the upper end of the arc-shaped guide surface one is smaller than the cross-sectional width of the upper end of the arc-shaped guide surface two. The locking groove is provided below the arc-shaped guide surface two. The upper part of the locking sleeve is provided with a second mounting structure, and a first fastening channel is provided through the second mounting structure. The handrail is provided with a second fastening channel arranged corresponding to the first fastening channel. The locking sleeve and the handrail are connected by fasteners in the first and second fastening channels. The first fastening channel is connected to the connecting channel, and the connecting channel forms an operation channel for assembling or disassembling the fasteners. An elastic reset member for keeping the locking part in the locked position is also provided between the locking body and the locking sleeve. The elastic reset member is arranged between the locking body and the locking sleeve on the side of the locking body closer to the operating part, and the locking part is arranged on the side of the locking body away from the operating part. The locking member can slide along the sliding channel between the locked position and the unlocked position. When the locking member is in the locked position, the first fastening part is limited to the upper side of the locking part. When the locking member is in the unlocked position, the fastening part can pass through the locking channel and extend into the connecting channel or extend out of the connecting channel.
2. The locking mechanism according to claim 1, characterized in that: The sliding channel is formed by a recess in the inner wall of the locking sleeve and is arranged around the connecting channel. The length direction of the sliding channel is arranged radially along the locking sleeve, and one end of the sliding channel in the length direction is set as a closed structure, while the other end of the sliding channel in the length direction is set as an open channel that penetrates the side wall of the locking sleeve. The operating part extends out of the open channel.
3. The locking mechanism according to claim 2, characterized in that: The outer wall of the locking sleeve is provided with a hook along the length of the sliding channel. The operating part includes an operating body and a limiting plate provided on the operating body. The movement of the locking member toward the opening channel is limited by the limiting plate engaging with the hook.
4. The locking mechanism according to claim 3, characterized in that: The latching component includes two extension rods extending outward from the outer wall of the locking sleeve along the length of the sliding channel, and two latching portions protruding from opposite sides of the two extension rods. The operating body extends outward from the locking body, and the limiting plate extends downward from the operating body. A positioning channel extending upward from the bottom of the limiting plate is provided through the limiting plate along the length of the sliding channel. The extension rods are arranged in the positioning channel and can move relative to the positioning channel along the length of the sliding channel. The operating part also includes an operating plate extending downward from the operating body. The operating plate is spaced apart on the side of the limiting plate away from the locking sleeve, and a limiting cavity is formed between the operating plate and the limiting plate for the latching portions to move inward along the length of the sliding channel. The movement of the locking component towards the open channel is limited by the engagement connection between the limiting plate and the latching portions. The movement of the locking component towards the closed structure is limited by the abutment between the operating plate and the latching portions.
5. The locking mechanism according to claim 4, characterized in that: The locking sleeve has a recessed mounting groove along the length of the sliding channel from its outer side wall. The mounting groove is arranged on the upper side of the opening channel and is connected to the opening channel and the sliding channel. The upper side of the locking body also has a protruding locking abutment block arranged corresponding to the mounting groove. The elastic reset member is arranged between the locking abutment block and the mounting groove. The locking abutment block can move along the mounting groove as the locking member slides relative to the sliding channel.
6. The locking mechanism according to any one of claims 1-4, characterized in that: When the locking member is in the locked position, the locking part can be limited to the upper side of the second fastening part, and the inner wall of the locking groove abuts against the locking part to restrict the movement of the locking member along the sliding channel.
7. A folding chair, characterized in that: It includes four vertical bars, a scissor lift assembly movably connected between two adjacent vertical bars, and a handrail arranged between two front and rear vertical bars. The rear end of the handrail is hinged to a rear vertical bar, and the front end of the handrail is connected to the upper end of a front vertical bar by a locking mechanism as described in any one of claims 1-6.