Bullet-proof easy-to-unfold structure and folding leg frame

Abstract

The utility model relates to the field of pivot connection structures, in particular to a bulletproof and easy-to-unfold structure and a folding leg frame, the bulletproof and easy-to-unfold structure comprises a frame member and a support rod rotatably mounted on the frame member, an insertion part is arranged on the frame member, one end of the support rod is an insertion end, and the insertion end is suitable for being inserted into the insertion part; the inserting part is provided with an avoiding opening, and the avoiding opening provides an avoiding space for the inserting end, wherein the avoiding space can be rotated out of the inserting part. When the supporting rod is completely folded, the limiting part is located on one side of the insertion end and limits the supporting rod to rotate in the unfolding direction, the supporting rod cannot automatically reset and unfold under the action of no external force, and therefore it can be guaranteed that the folded supporting rod is in a stable folded state, and the supporting rod is not prone to falling off after being folded. Stable folding can be achieved without the help of an external restraining piece.

Description

Technical Field

[0001] The utility model relates to the field of pivot connection structures, and in particular to a bulletproof opening and easy unfolding structure and a folding leg frame. Background Art

[0002] A folding chair generally includes two frame members hinged to each other. A front leg rod, a rear leg rod, a front seat rod, and a backrest rod are inserted into the frame members. Among them, an elastic cable is used to connect the front leg rod and the front seat rod, and an elastic cable is used to connect the rear leg rod and the backrest rod.

[0003] The front leg rod, the rear leg rod, the front seat rod, and the backrest rod can be detached from the frame members and folded relative to the frame members. After folding, the front leg rod and the front seat rod are mutually pulled by the elastic cable, and the rear leg rod and the backrest rod are mutually pulled by the elastic cable after folding. In this state, the front leg rod, the rear leg rod, the front seat rod, and the backrest rod are in a separated state from the frame members. When the folding chair is unfolded, the front leg rod, the rear leg rod, the front seat rod, and the backrest rod need to be inserted into the corresponding insertion parts on the frame members.

[0004] Through the understanding of the above related technologies, after the front leg rod, the rear leg rod, the front seat rod, and the backrest rod of the folding chair are folded, the elastic cable is in a stretched state. When the user stores the folding chair, multiple rods need to be folded and then constrained and fixed. If the user has small hands, when folding the next rod, the previously folded rod will reset without being well constrained by the palm. During the folding process of the folding chair, our users cannot hold all the sequentially folded rods. During the storage process, the folded rods that are not held will reset, resulting in inconvenient storage of the chair. Content of the Utility Model

[0005] The purpose of at least one specific embodiment of the utility model is to solve the defects existing in the prior art and provide a bulletproof opening and easy unfolding structure and a folding leg frame.

[0006] To achieve the above purpose, a bulletproof opening and easy unfolding structure provided by the present application includes:

[0007] A frame member;

[0008] A support rod;

[0009] The support rod is rotatably installed on the frame member;

[0010] The frame member is provided with an insertion part, and one end of the support rod is an insertion end, and the insertion end is adapted to be inserted into the insertion part;

[0011] The insertion part is provided with an avoidance opening, and the avoidance opening provides the avoidance space required for the insertion end to rotate out of the insertion part;

[0012] A limiting part is provided at the avoidance opening. When the support rod is pulled out from the insertion part and folded relative to the frame member, the limiting part is adapted to limit the rotation angle of the support rod.

[0013] Furthermore, the limiting part can be arranged on the inner side wall surface of the insertion part. When the limiting part is arranged on the inner side wall surface of the insertion part, the limiting part limits the folded state of the support rod.

[0014] Through the above technical solution, the support rod is rotatably installed on the frame member. In the use state, the support rod is in the unfolded state and is inserted into the insertion part of the frame member. When the support rod needs to be folded and retracted, the insertion end of the support rod is pulled out from the insertion part. When the support rod rotates to the folded state, the avoidance opening provides the space required for the rotation of the insertion end. At the same time, the outer peripheral surface of the insertion end of the support rod will squeeze the limiting part at the avoidance opening until the support rod is completely folded. The limiting part is located on one side of the insertion end and restricts the support rod from rotating in the unfolding direction. Without the action of external force, the support rod will not automatically reset and unfold. In this way, it can ensure that the folded support rod is in a stable retracted state. After the support rod is folded, it can be stably retracted without the aid of external restraint members.

[0015] Furthermore, a pivot is provided on one of the insertion part and the insertion end, and a guide groove corresponding to the pivot is provided on the other of the insertion part and the insertion end; the pivot is in sliding fit with the guide groove.

[0016] When the pivot slides to one end of the guide groove, the support rod is in the first assembly state, and the support rod is stopped relative to the insertion part.

[0017] When the pivot slides to the other end of the guide groove, the support rod is in the second assembly state, and the support rod can rotate with the insertion part.

[0018] Furthermore, the limiting part is two limiting protrusions installed on the inner wall of the avoidance opening. A limiting opening is formed between the two limiting protrusions, and the diameter of the limiting opening is smaller than the diameter of the support rod.

[0019] Furthermore, the number of avoidance openings is two, and the depths of the two avoidance openings are inconsistent.

[0020] Among them, the depth of the avoidance opening closer to the frame member side is greater than the depth of the avoidance opening on the other side. When the support rod is in the second assembly state and rotates with the insertion part, the rotation direction of the support rod is towards the frame member side. The avoidance opening with a larger depth closer to the frame member side provides a larger rotation avoidance space for the support rod, and the folding angle of the support rod is large. On the contrary, if the support rod rotates towards the side away from the frame member, the avoidance opening with a smaller depth cannot provide a large avoidance space, and the folding angle of the support rod is small. In this way, it can play an anti-mistake effect, and the user can intuitively understand that the rotation and folding direction of the support rod is towards the frame member.

[0021] Further, one end of the guiding groove is a first limiting end, and the other end is a second limiting end;

[0022] When the pivot slides to the first limiting end of the guiding groove, the support rod is in the first assembly state, the insertion end of the support rod extends into the insertion part, and the support rod is stopped relative to the insertion part;

[0023] When the pivot slides to the second limiting end of the guiding groove, the support rod is in the second assembly state, the insertion end of the support rod is withdrawn from the insertion part, and the insertion end can rotate in the avoidance space with the pivot as the center, and the support rod can rotate relative to the insertion part.

[0024] Through the above technical solution, the insertion end of the support rod and the insertion part of the frame member are rotationally connected through a pivot. A guiding groove that slidably cooperates with the pivot is provided on the insertion end of the support rod or the insertion part of the frame member. Moreover, an avoidance opening is provided on the insertion part. When the support rod is withdrawn from the insertion part by a certain distance until the pivot slides to the second limiting end of the guiding groove, the support rod rotates with the pivot as the center and the insertion part and is in a folded state. The avoidance opening provides the avoidance space required for the insertion end to rotate out of the insertion part. The support rod in the folded state is in a rotationally connected state with the insertion part but does not separate;

[0025] When the support rod needs to be unfolded, the support rod rotates in the opposite direction with the insertion part with the pivot as the center. When the insertion end of the support rod faces the insertion part, the insertion end can be inserted into the insertion part. At this time, the pivot slides to the first limiting end of the guiding groove, and the pivot limits the support rod. When the support rod is stressed, it cannot further extend into the interior of the insertion part, and at the same time, the support rod cannot rotate relative to the insertion part, so as to achieve a high-strength support effect after unfolding. After using this easy-to-expand structure, during the conversion process of the support rod from the folded state to the unfolded state, there is no need for manual docking between the insertion end of the support rod and the insertion part of the frame member. Through the cooperation of the pivot and the guiding groove, after the support rod is unfolded, its insertion end can automatically align with the insertion part, and the assembly between the support rod and the frame member is convenient and efficient;

[0026] In addition, an elastic member is arranged between the support rod and the frame member. When the support rod is in the folded state, the elastic member is in a stretched state. When the support rod is converted from the folded state to the unfolded state, under the elastic tension of the elastic member, the insertion end of the support rod will automatically be inserted into the insertion part. Through the cooperation of the pivot and the guiding groove and the structural design of the elastic member, when the support rod is in the folded state and the external restraint is removed, the support rod can achieve automatic alignment and automatic insertion with the insertion part.

[0027] Further, the distance dimension between the pivot and the bottom of the avoidance opening is smaller than the length dimension of the guiding groove.

[0028] Further, it further includes a cable, the cable is the above-mentioned elastic member, one end of the cable extends into a support rod and is connected thereto, and the other end of the cable extends into the interior of the frame member and extends into another support rod and is connected thereto.

[0029] Further, the bulletproof and easily deployable structure includes a folded state and an unfolded state. When the bulletproof and easily deployable structure is in the folded state, the support rod is folded relative to the frame member, and the limiting port can overcome the elastic tension of the cable to limit the folded state of the support rod.

[0030] When the easily deployable structure is converted from the folded state to the unfolded state, a person rotates the support rod by hand. The support rod rotates around the frame member connected thereto and overcomes the limiting clamping force of the limiting port. When the insertion end faces the insertion portion, under the elastic tension of the cable, the insertion end can be inserted into the insertion portion.

[0031] The beneficial technical effects of the bulletproof and easily deployable structure provided by the present application compared with the prior art are as follows: The bulletproof and easily deployable structure is used at the connection position between the support rod and the frame member. The support rod is rotatably installed on the frame member. In the use state, the support rod is in the unfolded state and is inserted into the insertion portion of the frame member. When the support rod needs to be folded and retracted, the insertion end of the support rod is withdrawn from the insertion portion. When the support rod rotates to the folded state, the avoidance port provides the space required for the rotation of the insertion end. At the same time, the outer peripheral surface of the insertion end of the support rod will squeeze the limiting portion at the avoidance port until the support rod is completely folded. The limiting portion is located on one side of the insertion end and restricts the support rod from rotating in the unfolded direction. Without external force, the support rod will not automatically reset and unfold. In this way, it can ensure that the folded support rod is in a stable retracted state. After the support rod is folded, it can be stably retracted without the need for an external restraint member.

[0032] In some embodiments, the limiting portion can be arranged at the edge position of the insertion portion. When the limiting portion is arranged at the edge position of the insertion portion, the limiting portion limits the semi-folded state of the support rod.

[0033] Through the above technical solution, the support rod is rotatably installed on the frame member. In the use state, the support rod is in the unfolded state and is inserted into the insertion portion of the frame member. When the support rod needs to be folded and retracted, the insertion end of the support rod is withdrawn from the insertion portion. When the support rod rotates to the folded state, the avoidance port provides the space required for the rotation of the insertion end. At the same time, the outer peripheral surface of the insertion end of the support rod will squeeze the limiting portion at the avoidance port until the support rod is completely folded. The support rod is bundled and fixed by a restraint belt. After the restraint belt is removed, under the tension of the elastic member, the support rod will bounce in the unfolded direction. At this time, the limiting portion at the edge position of the insertion portion limits the end of the insertion end of the support rod to ensure that the bounced support rod is in a semi-folded state rather than completely bounced. In this case, it can prevent the problem that the support rod automatically bounces and causes injury when the restraint force is released.

[0034] Another technical solution adopted by the present application is to provide a folding leg stand, comprising:

[0035] A plurality of the above-mentioned bulletproof and deployable structures;

[0036] The frame members are hinged to each other;

[0037] A front foot bar, a rear foot bar, a front seat bar, and a rear back bar plugged into the frame member;

[0038] A first cable, one end of which extends into and is connected to the front foot rod, and the other end of which extends into and is connected to the front seat rod;

[0039] One end of the second cable extends into and is connected to the rear foot rod, and the other end extends into and is connected to the back rod.

[0040] Further, when the front foot bar and the front seat bar are folded relative to the frame member, the first cable is in an elastically stretched state;

[0041] When the rear foot rod and the rear back rod are folded relative to the frame member, the second cable is in an elastically stretched state.

[0042] Further, the front foot bar, the rear foot bar, the front seat bar, and the rear back bar are constructed as support bars.

[0043] The foldable leg frame provided by the present application adopts the above-mentioned bulletproof and easy-to-expand structure. The front foot rod, rear foot rod, front seat rod, and back rod of the foldable leg frame can be constructed as the support rods of the above-mentioned bulletproof and easy-to-expand structure. The front foot rod, rear foot rod, front seat rod, and back rod can be freely folded or unfolded relative to the frame member. When the front foot rod, rear foot rod, front seat rod, and back rod are plugged into the plug-in part on the frame member, each rod can also achieve automatic alignment and automatic insertion with the plug-in part on the frame member, and the assembly between each rod and the frame member is convenient and efficient.

[0044] Moreover, after the front foot rod, rear foot rod, front seat rod, and back rod are folded relative to the frame component, the limiting parts arranged on the frame component can limit the folded front foot rod, rear foot rod, front seat rod, and back rod, and each rod will not automatically reset in the unfolding direction when not affected by external force, and each folded rod can be stably folded without the aid of external constraints.

[0045] The folding leg frame of the present application is applied to a folding chair. After the various rods of the folding chair are folded, they will not automatically reset in the unfolding direction without the action of external force. By changing the folding and unfolding methods of the various rods on the folding chair, it is convenient for users with smaller hands to fold the folding chair. When the user needs to unfold the folding chair for use, the support rod can be automatically unfolded under the action of the guide groove and the pivot by bending the support rod, which is convenient for the user to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 It is a schematic diagram of the easy-expansion structure in Embodiment 1 of the present invention.

[0048] Figure 2 It is a schematic diagram of the easy-expansion structure from another angle in Embodiment 1 of the present invention.

[0049] Figure 3 It is Figure 1 the enlarged view of Area A in

[0050] Figure 4 It is an assembly schematic diagram of the easy-expansion structure in Embodiment 1 of the present invention.

[0051] Figure 5 It is a schematic diagram of the structure when the support rod of the easy-expansion structure in Embodiment 1 of the present invention is pulled out.

[0052] Figure 6 It is a schematic diagram of the structure when the support rod of the easy-expansion structure in Embodiment 1 of the present invention is folded.

[0053] Figure 7 It is Figure 6 the enlarged view of Area B in

[0054] Figure 8 It is a schematic diagram of the easy-expansion structure in Embodiment 2 of the present invention.

[0055] Figure 9 It is Figure 8 the enlarged view of Area C in

[0056] Figure 10 It is a schematic diagram of the structure when the support rod of the easy-expansion structure in Embodiment 2 of the present invention is folded.

[0057] Figure 11 It is Figure 10 the enlarged view of Area D in

[0058] Figure 12 It is a schematic diagram of the structure when the folding leg frame in Embodiment 3 of the present invention is in the unfolded state.

[0059] Figure 13This is a schematic structural view of the folding leg frame in the retracted state in Embodiment 3 of the present utility model.

[0060] Figure 14 This is a schematic structural view of the folding leg frame in the folded state in Embodiment 3 of the present utility model.

[0061] Figure 15 This is a schematic structural view of the folding leg frame in the folded state in Embodiment 4 of the present utility model. Detailed implementation manners

[0062] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0063] Embodiment 1

[0064] Refer to Figure 1 , Figure 2 , Figure 3 , a bulletproof and easy-to-expand structure 100, including a frame member 10 and a support rod 20 rotatably mounted on the frame member 10. Among them, a plug-in portion 101 is provided on the frame member 10, and one end of the support rod 20 is an insertion end 201, and the insertion end 201 is adapted to be inserted into the plug-in portion 101;

[0065] An avoidance opening 102 is provided on the plug-in portion 101, and the avoidance opening 102 provides the avoidance space required for the insertion end 201 to rotate out of the plug-in portion 101;

[0066] A limiting portion 103 is provided at the avoidance opening 102. When the support rod 20 is pulled out from the plug-in portion 101 and folded relative to the frame member 10, the limiting portion 103 is adapted to limit the folded state of the support rod 20.

[0067] In the use state, the support rod 20 is in the unfolded state and is inserted into the plug-in portion 101 of the frame member 10. When the support rod 20 needs to be folded and retracted, the insertion end 201 of the support rod 20 is pulled out from the plug-in portion 101. When the support rod 20 rotates to the folded state, the avoidance opening 102 provides the space required for the rotation of the insertion end 201. At the same time, the outer peripheral surface of the insertion end 201 of the support rod 20 will squeeze the limiting portion 103 at the avoidance opening 102 until the support rod 20 is completely folded. The limiting portion 103 is located on one side of the insertion end 201 and restricts the support rod 20 from rotating in the unfolding direction. Without external force, the support rod 20 will not automatically reset and unfold, so that the folded support rod 20 can be kept in a stable retracted state. After the support rod 20 is folded, it can be stably retracted without the aid of external restraint members.

[0068] Specifically, the limiting part 103 is two limiting protrusions installed on the inner wall of the avoiding opening 102. A limiting opening is formed between the two limiting protrusions, and the diameter of the limiting opening is smaller than the diameter of the support rod 20.

[0069] Refer to Figures 4 to 7 , in this embodiment, the two limiting protrusions (limiting part 103) are arranged on the inner side wall surface of the insertion part 101. When the limiting part 103 is arranged on the inner side wall surface of the insertion part 101, the limiting part 103 completely limits the folded state of the support rod 20.

[0070] In some embodiments, the number of the avoiding openings 102 is two, and the depths of the two avoiding openings 102 are inconsistent; among them, the depth of the avoiding opening closer to the frame member 10 is greater than that of the other avoiding opening. When the support rod 20 is in the second assembly state and the support rod 20 rotates with the insertion part 101, the rotation direction of the support rod 20 is towards the side of the frame member 10. The avoiding opening 102 with a greater depth closer to the frame member 10 provides a larger rotation and avoiding space for the support rod 20, and the folding angle of the support rod 20 is large. On the contrary, if the support rod 20 rotates towards the side away from the frame member 10, the avoiding opening 102 with a smaller depth cannot provide a larger avoiding space, and the folding angle of the support rod 20 is smaller. In this way, an anti-mistake effect can be achieved, and the user can intuitively understand that the rotation and folding direction of the support rod 20 is towards the frame member 10.

[0071] Furthermore, a pivot 30 is provided on one of the insertion part 101 and the insertion end 201, and a guiding groove 40 corresponding to the pivot 30 is provided on the other of the insertion part 101 and the insertion end 201. The pivot 30 is in sliding fit with the guiding groove 40;

[0072] When the pivot 30 slides to one end of the guiding groove 40, the support rod 20 is in the first assembly state, and the support rod 20 is stopped relative to the insertion part 101;

[0073] When the pivot 30 slides to the other end of the guiding groove 40, the support rod 20 is in the second assembly state, and the support rod 20 can rotate with the insertion part 101.

[0074] Specifically, one end of the guiding groove 40 is the first limiting end 401, and the other end is the second limiting end 402;

[0075] When the pivot 30 slides to the first limiting end 401 of the guiding groove 40, the support rod 20 is in the first assembly state, the insertion end 201 of the support rod 20 extends into the insertion part 101, and the support rod 20 is stopped relative to the insertion part 101;

[0076] When the pivot 30 slides to the second limit end 402 of the guide groove 40, the support rod 20 is in the second assembly state. The insertion end 201 of the support rod 20 is withdrawn from the insertion part 101. The insertion end 201 can rotate in the avoidance space with the pivot 30 as the center, and the support rod 20 can rotate relative to the insertion part 101.

[0077] In addition, the dimension of the distance between the center of the pivot 30 and the bottom of the avoidance opening 102 is smaller than the dimension of the length of the guide groove 40. The advantage of this dimension design is that when the insertion end 201 of the support rod 20 is completely inserted into the insertion part 101, the pivot 30 is located at the first limit end 401 of the guide groove 40. When the insertion end 201 of the support rod 20 is completely withdrawn from the insertion part 101 and the pivot 30 is located at the second limit end 402 of the guide groove 40, after the insertion end 201 of the support rod 20 is completely withdrawn from the insertion part 101, the end face of the insertion end 201 can be located in the space where the avoidance opening 102 is located. In this case, the insertion end 201 can rotate with the pivot 30 as the center in the space provided by the avoidance opening 102.

[0078] During specific operation, the insertion end 201 of the support rod 20 is rotatably connected to the insertion part 101 of the frame member 10 through the pivot 30. A guide groove 40 that slidably cooperates with the pivot 30 is provided on the insertion end 201 of the support rod 20 or the insertion part 101 of the frame member 10. Moreover, an avoidance opening 102 is provided on the insertion part 101. When the support rod 20 is withdrawn from the insertion part 101 by a certain distance until the pivot 30 slides to the second limit end 402 of the guide groove 40, the support rod 20 rotates with the pivot 30 as the center and the insertion part 101 and is in a folded state. The avoidance opening 102 provides the avoidance space required for the insertion end 201 to rotate out of the insertion part 101. The support rod 20 in the folded state is in a rotatably connected state with the insertion part 101 but does not separate. During the folding rotation process of the support rod 20, the surface of the support rod 20 will contact and press the limit part 103. The force for the support rod 20 to rotate is provided by a person's hand. When the support rod 20 gradually rotates to the fully folded state, the support rod 20 gradually presses the limit part 30 and swings to one side of the limit opening. Until the support rod 20 is completely in the folded state, the limit opening completely limits the folded state of the support rod 20. Without external force, the support rod 20 cannot rotate in the reverse direction and unfold. At this time, the folded support rod 20 does not need to be bundled and fixed by an external restraint belt.

[0079] When the support rod 20 needs to be deployed, a person rotates the support rod 20 by hand. The support rod 20 rotates in the opposite direction to the insertion part 101 with the pivot 30 as the center. At this time, the support rod 20 gradually presses against the limiting part 30 and swings to the other side of the limiting port. Until the insertion end 201 of the support rod 20 faces the insertion part 101, the insertion end 201 can be inserted into the insertion part 101. At this time, the pivot 30 slides to the first limiting end 401 of the guide groove 40. The pivot 30 limits the support rod 20, and when the support rod 20 is stressed, it cannot further extend into the interior of the insertion part 101. At the same time, the support rod 20 cannot rotate relative to the insertion part 101, so as to achieve a high-strength support effect after deployment. After using this easy-to-deploy structure, during the conversion process of the support rod 20 from the folded state to the deployed state, there is no need for manual docking between the insertion end 201 of the support rod and the insertion part 101 of the frame member 10. Through the cooperation of the pivot 30 and the guide groove 40, after the support rod 20 is deployed, its insertion end 201 can automatically align with the insertion part 101, and the assembly between the support rod 20 and the frame member 10 is convenient and efficient;

[0080] In some embodiments, a cable 50 is arranged between the support rod 20 and the frame member 10. One end of the cable 50 extends into a support rod 20 and is connected thereto. The other end of the cable 50 extends into the interior of the frame member 10 and extends into another support rod 20 and is connected thereto. The cable 50 is an elastic member. The bulletproof and easy-to-deploy structure includes a folded state and a deployed state. When the support rod 20 is in the folded state, the elastic member (cable 50) is in a stretched state. However, the limiting port can overcome the elastic tension of the cable 50 to limit the folded state of the support rod 20. When the support rod 20 is not affected by an external force, it will not automatically reset and deploy. In this way, it can be ensured that the folded support rod 20 is in a stable folded state. After the support rod 20 is folded, it can be stably folded without the aid of an external restraint;

[0081] When the support rod 20 is converted from the folded state to the deployed state, a person rotates the support rod 20 by hand. The support rod 20 rotates with the pivot 30 as the center relative to the insertion part 101. At this time, when the support rod 20 gradually presses against the limiting part 30 and swings to the other side of the limiting port, the limiting state of the limiting port on the support rod 20 is released. Under the elastic tension of the cable 50, the insertion end 201 of the support rod 20 will automatically be inserted into the insertion part 101. Through the cooperation of the pivot 30 and the guide groove 40, and the structural design of the elastic member (cable 50), when the support rod 20 is in the folded state and its limiting state is released, the support rod 20 can achieve automatic alignment and automatic insertion with the insertion part 101.

[0082] Embodiment 2

[0083] Refer to Figures 8 to 11, Based on the same technical concept, the difference between the embodiment of the present application and Embodiment 1 is that the limiting portion 103 is disposed at the edge position of the insertion portion 101, specifically on the inner wall of the avoidance opening 102. When the limiting portion 103 is disposed at the edge position of the insertion portion 101, the limiting portion 103 can limit the semi-folded state of the support rod 20. The support rod 20 is rotatably mounted on the frame member 10. In the use state, the support rod 20 is in the unfolded state and is inserted into the insertion portion 101 of the frame member 10. When the support rod 20 needs to be folded and retracted, the insertion end 201 of the support rod 20 is withdrawn from the insertion portion 101. When the support rod 20 rotates to the folded state, the avoidance opening 102 provides the space required for the rotation of the insertion end. At the same time, the outer peripheral surface of the insertion end 201 of the support rod 20 presses against the limiting portion 103 at the avoidance opening 102 until the support rod 20 is completely folded. After the restraint belt is removed, under the pulling force of the elastic member (cable 50), the support rod 20 will bounce in the unfolding direction. At this time, the limiting portion 103 at the edge position of the insertion portion 101 limits the end of the insertion end 201 of the support rod 20, ensuring that the bounced support rod 20 is in the semi-folded state rather than completely bounced open. In this case, it is possible to prevent the problem that the support rod 20 automatically bounces open and causes injury when the binding force is released.

[0084] Embodiment 3

[0085] Referring to Figures 12 to 14 , Based on the same technical concept, the embodiment of the present application provides a folding leg frame 200, including a plurality of anti-bounce and easy-to-unfold structures 100 in the above Embodiment 1;

[0086] A front foot rod 210, a rear foot rod 220, a front seat rod 230, and a back rod 240 inserted into the frame member 10;

[0087] A first cable 250, one end of which extends into the front foot rod 210 and is connected thereto, and the other end extends into the front seat rod 230 and is connected thereto;

[0088] A second cable 260, one end of which extends into the rear foot rod 220 and is connected thereto, and the other end extends into the back rod 240 and is connected thereto.

[0089] Wherein, a plurality of frame members 10 are hinged to each other. When the front foot rod 210 and the front seat rod 230 are folded relative to the frame member 10, the first cable 250 is in an elastically stretched state; when the rear foot rod 220 and the back rod 240 are folded relative to the frame member 10, the second cable 260 is in an elastically stretched state.

[0090] In this embodiment, the folding leg stand 200 adopts the bulletproof and easily deployable structure 100 in the above-mentioned embodiment 1. The front foot rod 210, the rear foot rod 220, the front seat rod 230, and the back rod 240 of the folding leg stand 200 are constructed as the support rod 20 in the above-mentioned embodiment 1. The front foot rod 210, the rear foot rod 220, the front seat rod 230, and the back rod 240 are connected to the frame member 10 using the bulletproof and easily deployable structure 100 in the above-mentioned embodiment 1. Each rod can be freely folded or unfolded relative to the frame member 10. When the front foot rod 210, the rear foot rod 220, the front seat rod 230, and the back rod 240 are plugged into the plug-in portion 101 on the frame member 10, each rod can also achieve automatic alignment and automatic insertion with the plug-in portion 101 on the frame member 10, and the assembly between each rod and the frame member 10 is convenient and efficient.

[0091] It should be noted that the length of the back bar 240 is generally greater than that of other bars. Therefore, the back bar 240 can be formed by plugging together a plurality of back bar units 2401. When the back bar 240 is folded and stored, the plurality of back bar units 2401 can be separated and folded.

[0092] In this embodiment, after the front foot rod 210, the rear foot rod 220, the front seat rod 230, and the back rod 240 are folded relative to the frame member 10, the limiting portion 103 provided on the frame member 10 can completely limit the folded front foot rod 210, the rear foot rod 220, the front seat rod 230, and the back rod 240, and each rod will not automatically reset in the unfolding direction when not affected by external forces, and each folded rod can be stably folded without the aid of external constraints.

[0093] The folding leg rack 200 of the present application is applied to a folding chair. After the various rods of the folding chair are folded, they will not automatically reset in the unfolding direction without the action of external force. By changing the folding and unfolding methods of the various rods on the folding chair, it is convenient for users with smaller hands to fold the folding chair. When the user needs to unfold the folding chair for use, the support rod can be automatically unfolded under the action of the guide groove and the pivot by bending the support rod, which is convenient for the user to use.

[0094] Example 4

[0095] Reference Figure 12 , Figure 15, Based on the same technical concept, an embodiment of the present application provides a folding leg rest 200, which includes a plurality of bulletproof and easily deployable structures in Embodiment 2 above. In this embodiment, after the front leg rod 210, the rear leg rod 220, the front seat rod 230, and the back rod 240 are folded relative to the frame member 10, they need to be bundled and fixed by a restraint strap. After the restraint strap is removed, under the pulling force of the elastic members (the first cable 250 and the second cable 260), the front leg rod 210, the rear leg rod 220, the front seat rod 230, and the back rod 240 will spring open in the deployment direction. At this time, the limiting portion 103 at the edge position of the insertion portion 101 limits the ends of the insertion ends of each rod, ensuring that the sprung-open rods are in a semi-folded state rather than fully sprung open. In this case, it is possible to prevent the problem that the front leg rod 210, the rear leg rod 220, the front seat rod 230, and the back rod 240 after folding will automatically spring open and cause injury when the restraint force is released.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bulletproof and deployable structure, comprising: Frame members; Support rods; Characterized in that the support rod is rotatably mounted on the frame member; The frame member is provided with an inserting portion, one end of the support rod is an insertion end, and the insertion end is suitable for being inserted into the inserting portion; The plug-in portion is provided with an escape opening, and the escape opening provides the insertion end with the escape space required for rotating out of the plug-in portion; A limiting portion is provided at the avoidance opening, and when the support rod is drawn out from the plug-in portion and folded relative to the frame component, the limiting portion is suitable for limiting the rotation angle of the support rod.

2. The bulletproof and deployable structure according to claim 1, characterized in that: When the limiting portion is arranged on the inner wall surface of the inserting portion, the limiting portion limits the folding state of the supporting rod.

3. The bulletproof and deployable structure according to claim 1, characterized in that: When the limiting portion is arranged at the edge of the inserting portion, the limiting portion limits the half-folded state of the supporting rod.

4. The bulletproof and deployable structure according to claim 2 or 3, characterized in that: A pivot is provided on one of the plug-in portion and the insertion end, and a guide groove corresponding to the pivot is provided on the other of the plug-in portion and the insertion end, and the pivot is slidably matched with the guide groove; When the pivot slides to one end of the guide groove, the support rod is in a first assembly state, and the support rod is stopped relative to the plug-in portion; When the pivot slides to the other end of the guide groove, the support rod is in a second assembly state, and the support rod can rotate with the plug-in portion.

5. The bulletproof and deployable structure according to claim 1, characterized in that: The limiting parts are two limiting protrusions installed on the inner wall of the avoidance opening, a limiting opening is formed between the two limiting protrusions, and the diameter of the limiting opening is smaller than the diameter of the support rod.

6. The bulletproof and deployable structure according to claim 1, characterized in that: There are two avoidance openings, and the depths of the two avoidance openings are inconsistent; wherein the depth of the avoidance opening close to one side of the frame component is greater than the depth of the avoidance opening on the other side.

7. The bulletproof and deployable structure according to claim 4, characterized in that: One end of the guide groove is a first limiting end, and the other end is a second limiting end; When the pivot slides to the first limit end of the guide groove, the support rod is in a first assembly state, the insertion end of the support rod extends into the plug-in portion, and the support rod is stopped relative to the plug-in portion; When the pivot slides to the second limit end of the guide groove, the support rod is in a second assembly state, the insertion end of the support rod is pulled out from the plug-in portion, the insertion end can rotate in the avoidance space with the pivot as the center, and the support rod can rotate relative to the plug-in portion.

8. The bulletproof and deployable structure according to claim 4, characterized in that: The distance between the pivot and the bottom of the avoidance opening is smaller than the length of the guide groove.

9. The bulletproof and deployable structure according to claim 5, characterized in that: It also includes a cable, one end of which extends into one of the support rods and is connected thereto, and the other end of the cable extends into the interior of the frame component and extends into another of the support rods and is connected thereto.

10. The bulletproof and deployable structure according to claim 9, characterized in that: The bulletproof and easily deployable structure includes a folded state and an unfolded state. When the bulletproof and easily deployable structure is in the folded state, the support rod is folded relative to the frame member, and the limiting opening can overcome the elastic tension of the cable to limit the folded state of the support rod; When the easily deployable structure is converted from the folded state to the unfolded state, the support rod rotates around the frame member connected thereto and overcomes the limiting clamping force of the limiting opening, and when the insertion end is opposite to the plug-in portion, the support rod can be inserted into the plug-in portion under the elastic tension of the cable.

11. A folding leg stand, characterized in that: include: A plurality of bulletproof and deployable structures according to any one of claims 1 to 10; The frame members are hinged to each other; A front foot rod, a rear foot rod, a front seat rod, and a rear back rod plugged into the frame member; A first cable, one end of which extends into and is connected to the front foot rod, and the other end of which extends into and is connected to the front seat rod; One end of the second cable extends into and is connected to the rear foot rod, and the other end extends into and is connected to the back rod.

12. The folding leg stand according to claim 11, characterized in that: When the front foot bar and the front seat bar are folded relative to the frame member, the first cable is in an elastically stretched state; When the rear foot bar and the rear back bar are folded relative to the frame component, the second cable is in an elastically stretched state.

13. The folding leg stand according to claim 12, characterized in that: The front foot rod, the rear foot rod, the front seat rod, and the rear back rod are configured as the support rods.

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