Top structure of foldable framework capable of being rapidly folded and foldable framework

Abstract

The invention discloses a top structure of a foldable framework capable of being folded rapidly and the foldable framework. The top structure comprises a top hinge seat and a plurality of ribs which are distributed in a radiation mode with the top hinge seat as the center. A first limiting groove is formed in the upper surface of the top hinge seat in the rod length direction of the unfolding position of each rib, and the end portion of the center end of each rib is inserted into the corresponding first limiting groove and hinged to the top hinge seat through a first transversely-penetrating pin shaft; the diameter of the cross section of each first limiting groove is smaller than the web diameter of the first limiting groove, and the first limiting grooves can be elastically expanded and contracted in the process that the ribs swing with the corresponding first transverse penetrating pin shafts as the center. The folding scheme of the top structure without the center rod is provided for the first time, and the top structure can be automatically locked when the ribs swing to the unfolding position and can be rapidly folded; in addition, the available space of the top is obviously enlarged.

Description

Technical Field

[0001] This invention relates to the field of everyday consumer goods technology, specifically to the top structure of a foldable frame that can be quickly folded up and the foldable frame itself. Background Technology

[0002] Folding pointed roof frames are widely used in outdoor and emergency facilities such as tents and awnings, with the pointed roof retraction structure being the core of controlling opening and closing. Currently, mainstream folding pointed roof retraction structures generally borrow the linkage transmission and locking principle of umbrella frames, forming a core solution of "center rod - sliding sleeve - hinged linkage - elastic locking," which is the mainstream technical path for lightweight folding pointed roof structures.

[0003] Specifically, the structure is consistent with the core logic of the umbrella frame: First, it has a vertical central pole (corresponding to the umbrella shaft), which is mostly multi-segment nested to reduce the storage length; second, the central pole is fitted with a sliding sleeve (corresponding to the lower umbrella support) as the core of power transmission; third, it has multiple sets of radially hinged connecting rod assemblies (corresponding to the umbrella ribs), which are composed of main and secondary connecting rods hinged together. One end of the main connecting rod is connected to the sliding sleeve, and the other end is connected to the outer support rib. One end of the secondary connecting rod is connected to the fixed seat at the top of the central pole (corresponding to the upper umbrella head), and the other end is connected to the middle of the main connecting rod, forming a symmetrical four-bar linkage; fourth, it integrates an elastic locking mechanism (corresponding to the umbrella buckle lock), which consists of a spring, a locking pin, and a locking groove. When the sliding sleeve slides up to the preset position, the locking pin pops out to lock, so that the connecting rod unfolds and takes shape; pressing the locking pin unlocks, and the sliding sleeve slides down to drive the connecting rod to fold and close.

[0004] The umbrella-style folding spire, with its core structure of "central rod-sliding sleeve-hinged connecting rod-elastic locking," has a clear mechanical path and is relatively lightweight. However, it suffers from four inherent defects that make it difficult to directly apply to sauna tents: Firstly, the structure is complex and contains redundant components. This structure requires assembly from various components such as a central rod, sliding sleeve, main and auxiliary connecting rods, springs, locking pins, and locking slots. This not only makes the assembly process cumbersome, increasing production and maintenance costs, but also makes the connections between the multiple components prone to failure. Furthermore, the large number of components increases the number of seams and dead corners, making cleaning difficult and allowing skin flakes, sweat, and bacteria to accumulate. In addition, hair and other impurities can easily enter the sliding gap with the central guide rod, causing them to stick and jam, thus rendering the telescopic function ineffective.

[0005] Secondly, the central rod is continuous, resulting in obvious thermal bridging. The central rod forms a continuous cold bridge at the tip, causing condensation and dripping water on the outer section under sauna conditions, while the inner wall surface becomes extremely hot and scalding to the touch, leading to a poor user experience.

[0006] Third, the internal space is limited: the internal space is largely occupied by components such as the central rod and main connecting rod, leaving very little effective cavity.

[0007] In summary, existing umbrella-frame-based structures suffer from drawbacks such as structural complexity, redundant components, a central rod that runs through the tent, significant thermal bridging, and limited internal space, failing to meet the requirements of sauna tents. Therefore, developing a simplified structure with fewer components, a larger internal space, and the ability to quickly retract the tent's pointed roof is a pressing issue that needs to be addressed in this field. Summary of the Invention

[0008] One objective of this invention is to provide a top structure of a foldable frame that can be quickly folded up, and the foldable frame itself.

[0009] The technical solution to achieve the first objective of this invention is: a top structure of a foldable frame that can be quickly folded up, including a top hinge seat and multiple ribs radiating outward from the top hinge seat. A first limiting groove is formed on the upper surface of the top hinge seat along the length of the unfolded position of each rib. The center end of each rib is inserted into the corresponding first limiting groove and is hinged to the top hinge seat by a first transverse pin. The diameter of the cross-section of the first limiting groove is smaller than its web diameter. During the swinging process of the rib around the corresponding first transverse pin, the first limiting groove can elastically open and close.

[0010] The top structure of the foldable frame of this invention proposes a folding scheme without a central rod for the first time. It can automatically lock its shape when the ribs swing to the unfolded position without the need for auxiliary components such as a central rod, sliding sleeve, main and secondary connecting rods, springs, locking pins, and locking slots, and can also be quickly folded up. In addition, the structure is simple and has fewer parts. By eliminating the central rod and multiple hinges, the net height of the frame is significantly increased. The top is free of columns, which significantly expands the usable space.

[0011] The second objective of this invention is to provide a foldable frame that can be quickly folded up, including a bottom ring, a top structure, and several supporting columns distributed circumferentially along the bottom ring and connected between the two. The top structure is the top structure of the foldable frame that can be quickly folded up as described in the first objective; the ribs of the top structure are arranged one-to-one with the supporting columns, and the outer end of each rib is hinged to the upper end of the corresponding supporting column through a hinged elbow. One end of the hinged elbow is fixedly connected to the corresponding support column, and a second limiting groove is opened on the lower surface of the other end of the hinged elbow along the unfolded position rod length direction of the corresponding rib. The outer end of the corresponding rib is inserted into the second limiting groove and hinged to the hinged elbow through a second transverse pin. The diameter of the cross-section of the second limiting groove is smaller than its web diameter. During the swinging process of the rib around the corresponding second transverse pin, the second limiting groove can elastically open and close. The lower end of the support column is fixedly connected to the bottom ring.

[0012] The foldable frame structure of this invention is simple and has few accessories. By eliminating the central rod and multiple hinges, the internal height of the frame is significantly increased. The usable space at the top is expanded to meet the rigid requirements of sauna tents for large volume and barrier-free operation, which allows for "standing to change clothes and multiple people to steam at the same time".

[0013] Furthermore, on the inner side of the first limiting groove and / or the second limiting groove, secondary limiting grooves are respectively formed on the inner wall of the cross-sectional opening corresponding to the first transverse pin and / or the second transverse pin, along the length direction of the corresponding rib at the retracted position. The diameter of the cross-section of the secondary limiting groove is also smaller than its web diameter, allowing the secondary limiting grooves to elastically open and close during the rib's swinging motion. The elastic contraction of the secondary limiting grooves ensures that the end of the rib is confined within the corresponding secondary limiting groove when it swings to the retracted position, thus fixing the rib in the retracted state.

[0014] Furthermore, the cross-section of the first limiting groove is C-shaped or C-like with the opening facing upwards, and the cross-section of the second limiting groove is C-shaped or C-like with the opening facing downwards; the cross-sectional shape of the rib is preferably oblong (but can also be circular, elliptical, or polygonal, etc.). The cross-sectional shape of the first limiting groove and / or the second limiting groove is adapted to the outer contour shape of the rib's cross-section, so that the rib can be reliably fixed in the open state, and can swing around its corresponding first and second transverse pins with a small external force. The opening of the cross-section of the first limiting groove and / or the second limiting groove extends outwards to form a flared portion to achieve guidance and fault tolerance. When the first limiting groove and / or the second limiting groove is provided with a secondary limiting groove, the cross-sectional shape of the secondary limiting groove is also preferably adapted to the outer contour shape of the rib's cross-section.

[0015] Furthermore, the bottom ring includes multiple main support sections and multiple foldable sections that are alternately hinged along its circumference. The main support sections are arranged in a one-to-one correspondence with the support columns, and each support column is fixedly installed on the corresponding main support section. Each foldable segment is mainly composed of two or more connecting rods connected in series. Adjacent connecting rods are connected by a double-link hinge joint. The lower surfaces of the two ends of the double-link hinge joint are respectively provided with third limiting grooves along the unfolded length direction of the connecting rods on the same side. The ends of the two adjacent connecting rods are respectively inserted into the corresponding third limiting grooves and are each hinged to the double-link hinge joint by a third transverse pin. The diameter of the cross-section of the third limiting groove is smaller than its web diameter, so that the third limiting groove can elastically open and close during the swinging of the connecting rods. When unfolding, each link of the foldable section is pulled until its axis is parallel to the axis of the corresponding third limiting groove (at this time, each link is in the unfolded position). The third elastic limiting groove elastically contracts, so that the end of the link in the unfolded position is self-limited in the corresponding third limiting groove of the corresponding double link hinge when no external force is applied, realizing automatic locking of the unfolded state. At this time, the "whole rod" formed by each link unfolded can basically meet the long-distance support or extension requirements. When folding, only an upward external force needs to be applied. The third limiting groove elastically opens and the cross-sectional opening becomes larger. The link rotates around the third transverse pin at its end to fold up and achieve folding. The variable diameter bottom ring, combined with the foldable top structure, can realize that the entire frame can be folded to a smaller diameter.

[0016] Furthermore, for the aforementioned variable-diameter bottom ring, each foldable segment is connected to the adjacent main support segment via a single-link hinge joint. One end of the single-link hinge joint is fixedly connected to the adjacent main support segment, and a fourth limiting groove is formed on the upper surface of the other end along the length direction of the unfolded rod of the foldable segment. The diameter of the cross-section of the fourth limiting groove is smaller than its web diameter. During the swinging of the connecting rod, the fourth limiting groove can elastically open and close, which can fix the outer end of the foldable segment (i.e., the end of the connecting rod away from the double-link hinge joint) in the unfolded state, further improving the overall stability of the bottom ring in the unfolded state.

[0017] Inside the third and / or fourth limiting grooves, secondary limiting grooves are respectively formed on the inner wall of the cross-sectional opening corresponding to the third or / and second transverse pins along the length direction of the corresponding connecting rod in the retracted position. The diameter of the cross-section of the secondary limiting groove is also smaller than its web diameter. During the swinging of the connecting rod, the secondary limiting groove can elastically open and close. When the connecting rod swings to the retracted position, the secondary limiting groove elastically closes, and the end of the connecting rod can self-limit within the corresponding secondary limiting groove without external force, thus fixing the connecting rod in the retracted state. This invention can automatically lock the retracted form of the foldable section through the secondary limiting grooves without the need for additional auxiliary components.

[0018] The cross-sectional shape of the connecting rod is preferably oblong (but can also be a circle, ellipse, or polygon, etc.). The cross-sectional shape of the third and / or fourth limiting grooves is adapted to the outer contour shape of the connecting rod's cross-section, ensuring reliable fixation of the connecting rod in the extended state. Furthermore, a small external force is required to allow it to swing around its corresponding third and fourth transverse pins. The opening of the cross-section of the third and / or fourth limiting grooves extends outward to form a flared portion for guidance and fault tolerance. When the third and / or fourth limiting grooves are provided with secondary limiting grooves, the cross-sectional shape of these secondary limiting grooves is also preferably adapted to the outer contour shape of the connecting rod's cross-section.

[0019] The two connecting rods of the foldable section are preferably straight rods. In specific implementation, there are four main support sections, all of which are arc-shaped curved rods; when unfolded, each foldable section and each main support section are alternately connected in the circumferential direction to form a rounded rectangular ring structure (i.e., the bottom ring).

[0020] The supporting column is preferably composed of multiple sleeve pipes, and the sleeve pipes are provided with pin holes and / or elastic pins on their pipe walls. The locking between the sleeve pipes is achieved by inserting the elastic pins into the pin holes. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the top structure of the foldable frame of the present invention and the three-dimensional structure of the foldable frame in the unfolded state. Figure 2 for Figure 1 Enlarged view of section A; Figure 3 This is a schematic cross-sectional view of the top hinge seat of the present invention through the central axis of any of the first transverse pins. Figure 4 The hinged elbow of the present invention Figure 1 Schematic diagram of the cross section of line I-I; Figure 5 The double-link hinge joint of the present invention is along Figure 1 Schematic diagram of the cross section of line II-II; Figure 6 The single-link joint of the present invention is along Figure 1 Schematic diagram of the cross section of Line III-III; Figure 7 This is a schematic diagram of the top structure of the foldable frame of the present invention and the three-dimensional structure of the foldable frame in the folded state. Figure 8This is a schematic diagram of the assembly structure between the rib and the top hinge seat in the retracted state of the present invention. The rib is a schematic diagram of the cross-sectional structure, and the dotted line is the axis of the first elastic limiting groove. The assembly structure between the rib and the hinge elbow and between the connecting rod and the double connecting rod hinge joint (or single connecting rod hinge joint) in the retracted state is the same as the assembly structure between the rib and the top hinge seat, so it is not shown again. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Combination Figures 1-4 as well as Figure 7 , Figure 8 A top structure 20 of a foldable frame that can be quickly folded up and the foldable frame, including a top hinge seat 21 and four ribs 22 radiating outward from the top hinge seat 21. A first limiting groove 211 is formed on the upper surface of the top hinge seat 21 along the length of the unfolded position rod of each rib 22. The center end 221 of each rib 22 is inserted into the corresponding first limiting groove 211 and is hinged to the top hinge seat 21 by a first transverse pin 23. The diameter D1 of the cross-section of the first limiting groove is smaller than its web diameter d1. During the swinging process of the rib 22 around the corresponding first transverse pin 23, the first limiting groove can elastically open and close.

[0024] When the top structure 20 of the foldable frame of the present invention needs to be unfolded, the top hinge seat 21 is pushed upward along the frame axis, so that the center end 221 of each rib 22 is embedded in the corresponding first limiting groove 211 of the top hinge seat 21 along the center line of the groove. At this time, the first limiting groove elastically contracts, so that the center end 221 of each rib 22 can self-limit within the corresponding elastic limiting groove 211 when no external force is applied. At this time, the top structure 20 is in the unfolded state. If the ribs 22 are arranged obliquely upward, each rib 22 can form an inverted cone-shaped top together with the top hinge seat 21, and can maintain the shape lock of the top structure 20 in the unfolded state (e.g. Figure 1 (As shown); when it needs to be retracted, the top hinge seat 21 is pressed downward along the skeleton axis, so that each of the ribs 22 swings downward around its corresponding first transverse pin 23, and the top structure 20 retracts to the retracted state (as shown). Figure 7 (As shown).

[0025] Of course, the number of ribs 22 in the top structure 20 of the quick-folding foldable frame of the present invention can be, but is not limited to, the four shown in the figures, and can be increased or decreased as needed.

[0026] The foldable frame that uses the above-mentioned top structure can be quickly folded up, including a bottom ring 10, a top structure, and four supporting columns 30 distributed circumferentially along the bottom ring 10 and connected between the two. The top structure is the top structure 20 of the foldable frame that can be quickly folded up; the ribs 22 of the top structure 20 are arranged one-to-one with the supporting columns 30, and the outer end of each rib 22 is hinged to the upper end of the corresponding supporting column 30 through a hinged elbow 40. One end of the hinged elbow 40 is fixedly connected to the corresponding support column 30. A second limiting groove 41 is opened on the lower surface of the other end of the hinged elbow 40 along the unfolded position rod length direction of the corresponding rib 22. The outer end of the corresponding rib 22 is inserted into the second limiting groove 41 and is hinged to the hinged elbow 40 through a second transverse pin 50. The diameter D2 of the cross-section of the second limiting groove 41 is smaller than its web diameter d2. During the swinging process of the rib 22 around the corresponding second transverse pin 50, the second limiting groove can elastically open and close. The lower end of the support column 30 is fixedly connected to the bottom ring 10.

[0027] In the unfolded state, the outer end 222 of each rib 22 is embedded in the second limiting groove 41 of the corresponding hinged elbow 40 along the center line of the groove. The lower end 222 of each rib 22 can self-limit within the corresponding second limiting groove 41 when no external force is applied, further strengthening the shape locking of the top structure 20 in the unfolded state (e.g., Figure 1 As shown); when the top hinge seat 21 is pressed down along the skeleton axis to retract, each of the ribs 22 swings downward around its corresponding second transverse pin 50 (at the same time, the rib 22 also swings adaptively around its corresponding first transverse pin 23). During the entire swinging process, the frame composed of the bottom ring 10 and the support column 30 will successively undergo a structural micro-deformation process of "the top of each support column 30 gradually opening radially outward" and then "the top of each support column 30 gradually contracting radially inward", until the top 20 contracts to the retracted state (as shown). Figure 7 (As shown).

[0028] The invention features a quick-folding foldable frame structure with a simple design and few accessories; the expanded top space meets the rigid requirements of sauna tents for large capacity and unobstructed accessibility, allowing for "standing changes of clothes and multiple people to steam together".

[0029] Of course, the number of supporting columns 30 in this invention can be, but is not limited to, the four shown in the attached drawings, and can be increased or decreased as needed.

[0030] Furthermore, combined Figures 2-4 as well as Figure 8On the inner side of the first limiting groove 211 and / or the second limiting groove 41, secondary limiting grooves (212, 42) are respectively formed on the inner wall of the cross-sectional opening corresponding to the first transverse pin and / or the second transverse pin, along the length direction of the corresponding rib at the retracted position. The diameter of the cross-section of the secondary limiting grooves (212, 42) is also smaller than its web diameter. During the swinging of the rib 22, the secondary limiting grooves (212, 42) can elastically open and close. Since the secondary limiting grooves (212, 42) are located on the rotation path of the rib 22 and can coincide with the axis of the rib 22, the elastic contraction of the secondary limiting grooves (212, 42) causes the end of the rib 22 to be confined within the corresponding secondary limiting groove (212, 42) when it swings to the retracted position, thereby fixing the rib 22 in the retracted state. This invention can automatically lock the top retracted shape through the secondary limiting grooves (212, 42) without the need for additional auxiliary components. Because the assembly structure between the rib 22 and the hinged elbow 40 in the retracted state is the same as the assembly structure between the rib 22 and the top hinge seat 21 ( Figure 8 (As already shown), therefore the assembly structure between the rib 22 and the hinged elbow 40 in the retracted state is not shown again in the drawing. Of course, the present invention may also omit the secondary limiting grooves (212, 42), but in the retracted state, the cross-sectional opening of the first limiting groove 211 or / and the second limiting groove 41 will remain forcibly open. Maintaining this state for a long time will affect the resilience of the inner wall of the cross-sectional opening, which will have a certain impact on the effect of the next use.

[0031] Furthermore, such as Figure 3 , Figure 4 As shown, the cross-section of the first limiting groove 211 is a C-shape or C-like shape with the opening facing upwards, and the cross-section of the second limiting groove 41 is a C-shape or C-like shape with the opening facing downwards; the cross-sectional shape of the rib 22 is preferably oblong (it can also be a circle, ellipse, or polygon, etc., which are common shapes; rods with these cross-sectional shapes are all common rods, so they are not shown one by one). The cross-sectional shape of the first limiting groove 211 or / and the second limiting groove 41 is adapted to the outer contour shape of the cross-section of the rib 12, so that the rib 22 can be reliably fixed when in the open state, and a small external force can be applied to achieve swinging around the corresponding first and second transverse pins (23, 50). Figure 3 , Figure 4 As shown, the cross-sectional openings of the first limiting groove 211 and / or the second limiting groove 41 extend outward to form flared portions (2110, 410) to achieve guidance and fault tolerance. Figure 7 As shown, when the first limiting groove 211 or / and the second limiting groove 41 are provided with a secondary limiting groove, the cross-sectional shape of the secondary limiting groove is preferably adapted to the cross-sectional outer contour shape of the rib 22.

[0032] Furthermore, combined Figure 1 , Figure 5 and Figure 7 The bottom ring 10 includes multiple main support sections 11 and multiple foldable sections 12 that are alternately hinged along its circumference. The main support sections 11 are arranged in a one-to-one correspondence with the support columns 30, and each support column 30 is fixedly installed on the corresponding main support section 11. Each foldable segment 12 is mainly composed of two or more connecting rods 121 connected in series. Adjacent connecting rods 121 are connected by a double-link hinge joint 122. The lower surfaces of the two ends of the double-link hinge joint 122 are respectively provided with third limiting grooves 1221 along the unfolded length direction of the connecting rods 121 on the same side. The ends of the two adjacent connecting rods 121 are respectively inserted into the corresponding third limiting grooves 1221 and are each hinged to the double-link hinge joint 122 by a third transverse pin 123. The diameter D3 of the cross-section of the third limiting groove 1221 is smaller than its web diameter d3. During the swinging of the connecting rods 121, the third limiting groove 1221 can elastically open and close. When unfolding, each link 121 of the foldable section 12 is pulled until its axis is parallel to the axis of the corresponding third limiting groove 1221 (at this time, each link 121 is in the unfolded position). The third elastic limiting groove 1221 elastically contracts, so that the end of the link 121 in the unfolded position is self-limited in the corresponding third limiting groove 1221 of the corresponding double link hinge joint 122 when no external force is applied, realizing automatic locking of the unfolded state. At this time, the "whole rod" formed by each link 121 unfolding can basically meet the long-distance support or extension requirements. When folding, only an upward external force needs to be applied, and the end of the link 121 can open the third limiting groove 1221 (that is, the third limiting groove 1221 elastically opens and its cross-sectional opening becomes larger). The link 121 rotates around the third transverse pin 123 at its end to fold up. The variable diameter bottom ring 10, together with the foldable top structure 20, can realize that the entire frame can be folded to a smaller diameter. Of course, the bottom ring 10 can also be a fixed-diameter bottom ring, but the top structure 20 can only be narrowed downwards slightly; when the bottom ring 10 uses a variable-diameter bottom ring, it can be, but is not limited to, the specific structure shown in the figure, or it can adopt other existing variable-diameter ring structures.

[0033] For the aforementioned variable diameter bottom ring, further, combined with Figure 1 , Figure 6 and Figure 7Each of the foldable segments 12 is connected to the adjacent main support segments 11 via a single-link hinge joint 124. One end of the single-link hinge joint 124 is fixedly connected to the adjacent main support segment 11, and the other end is provided with a fourth limiting groove 1241 along the unfolded rod length direction of the foldable segment 12. The diameter D4 of the cross-section of the fourth limiting groove 1241 is smaller than its web diameter d4. During the swinging process of the connecting rod 121, the fourth limiting groove 1241 can elastically open and close, which can realize the fixation of the outer end of the foldable segment 12 (i.e. the end of the connecting rod 121 away from the double-link hinge joint 122) in the unfolded state, further improving the overall stability of the bottom ring 10 in the unfolded state.

[0034] Inside the third limiting groove 1221 or / and the fourth limiting groove 1241, secondary limiting grooves (1222, 1242) are respectively formed on the inner wall of the cross-sectional opening corresponding to the third transverse pin 1220 or / and the second transverse pin 1240 along the length direction of the corresponding connecting rod 121 in the retracted position. The diameter of the cross-section of the secondary limiting grooves (1222, 1242) is also smaller than its web diameter. During the swinging process of the connecting rod 121, the secondary limiting grooves (1222, 1242) can elastically open and close. When the connecting rod 121 swings to the retracted position, the secondary limiting grooves (1222, 1242) elastically close, and the end of the connecting rod 121 can self-limit within the corresponding secondary limiting grooves (1222, 1242) without external force, thereby fixing the retracted connecting rod 121 (in conjunction with...). Figure 1 as well as Figures 5-7 The assembly structure between the connecting rod 121 and the double-link hinge joint 122 (or the single-link hinge joint 124) in the retracted state is the same as... Figure 8 The assembly structure of the rib 22 and the top hinge seat 21 shown in the figure. The present invention can automatically lock the top folded shape through the secondary limiting grooves (1222, 1242) without the need for additional auxiliary components.

[0035] like Figure 5 , Figure 6 As shown, the cross-sectional shape of the connecting rod 121 is preferably oblong (it can also be a common shape such as a circle, ellipse, or polygon; connecting rods with these cross-sectional shapes are common rods, so they are not shown one by one). The cross-sectional shape of the third limiting groove 1221 or / and the fourth limiting groove 1241 is adapted to the outer contour shape of the cross-section of the connecting rod 121, so that the connecting rod 121 can be reliably fixed in the open state, and a small external force can be applied to achieve swinging around the corresponding third and fourth transverse pins (123, 125). Figure 5 , Figure 6As shown, the cross-sectional openings of the third limiting groove 1221 and / or the fourth limiting groove 1241 extend outward to form flared portions (1220, 1240) to achieve guidance and fault tolerance. When the third limiting groove 1221 and / or the fourth limiting groove 1241 are provided with secondary limiting grooves, the cross-sectional shape of the secondary limiting grooves (1222, 1242) is preferably adapted to the outer contour shape of the cross-section of the connecting rod 121.

[0036] like Figure 1 , Figure 7 As shown, the two connecting rods 121 of the foldable section 12 are preferably straight rods. In specific implementation, as... Figure 1 As shown, there are four main support sections, all of which are arc-shaped curved rods; when in the open state, each foldable section 12 and each main support section 11 are alternately connected in the circumferential direction to form a rounded rectangular ring structure (i.e., the bottom ring 10).

[0037] like Figure 1 As shown, the support column 30 is preferably composed of multiple sleeve pipes 31. The sleeve pipes 31 have pin holes and / or elastic pins 32 on their walls. The sleeve pipes 31 are locked together by inserting the elastic pins 32 into the pin holes. Of course, the support column 30 can also be a rod of a fixed length, but the top structure of the foldable frame and the length of the foldable frame when folded will be limited by the length of the support column 30.

[0038] The top structure of the quick-folding foldable frame described in this invention and the foldable frame can be, but are not limited to, used as a sauna tent frame.

[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A top structure of a foldable frame that can be quickly retracted, comprising a top hinge seat and multiple ribs radially distributed around the top hinge seat; characterized in that: A first limiting groove is formed on the upper surface of the top hinge seat along the length of the unfolded position of each rib. The center end of each rib is inserted into the corresponding first limiting groove and is hinged to the top hinge seat by a first transverse pin. The diameter of the cross-section of the first limiting groove is smaller than its web diameter. During the swinging process of the rib around the corresponding first transverse pin, the first limiting groove can elastically open and close.

2. A foldable frame that can be quickly collapsed, characterized in that: It includes a bottom ring, a top structure, and several supporting columns distributed circumferentially along the bottom ring and connected between the two; The top structure is the top structure of the foldable skeleton that can be quickly folded up as described in claim 1; The ribs of the top structure are arranged one-to-one with the supporting columns, and the outer end of each rib is hinged to the upper end of the corresponding supporting column through a hinged elbow. One end of the hinged elbow is fixedly connected to the corresponding support column, and a second limiting groove is opened on the lower surface of the other end of the hinged elbow along the unfolded position rod length direction of the corresponding rib. The outer end of the corresponding rib is inserted into the second limiting groove and hinged to the hinged elbow through a second transverse pin. The diameter of the cross-section of the second limiting groove is smaller than its web diameter. During the swinging process of the rib around the corresponding second transverse pin, the second limiting groove can elastically open and close. The lower end of the support column is fixedly connected to the bottom ring.

3. The foldable frame that can be quickly collapsed according to claim 2, characterized in that: On the inner side of the first limiting groove and / or the second limiting groove, secondary limiting grooves are respectively provided on the inner wall of the cross-sectional opening of the first transverse pin and / or the second transverse pin along the length direction of the retracting rod of their respective corresponding ribs. The diameter of the cross-section of the secondary limiting groove is also smaller than its web diameter. During the swinging of the ribs, the secondary limiting grooves can elastically open and close.

4. The foldable frame that can be quickly collapsed according to claim 2, characterized in that: The cross-section of the first limiting groove is C-shaped or C-like with the opening facing upwards, and the cross-section of the second limiting groove is C-shaped or C-like with the opening facing downwards; the cross-sectional shape of the rib is oblong, circular, elliptical, or polygonal, and the cross-sectional shape of the first limiting groove or / and the second limiting groove is adapted to the outer contour shape of the cross-section of the rib.

5. The foldable frame that can be quickly collapsed according to claim 3, characterized in that: The cross-sectional shape of the first limiting groove or / and the secondary limiting groove of the second limiting groove is adapted to the cross-sectional outer contour shape of the rib.

6. The foldable frame that can be quickly collapsed according to claim 2, characterized in that: The bottom ring includes multiple main support sections and multiple foldable sections that are alternately hinged along its circumference. The main support sections are arranged in a one-to-one correspondence with the support columns, and each support column is fixedly installed on the corresponding main support section. Each foldable segment is mainly composed of two or more connecting rods connected in series. Adjacent connecting rods are connected by a double-link hinge joint. The lower surfaces of the two ends of the double-link hinge joint are respectively provided with third limiting grooves along the unfolded length direction of the connecting rods on the same side. The ends of the two adjacent connecting rods are respectively inserted into the corresponding third limiting grooves and are each hinged to the double-link hinge joint by a third transverse pin. The diameter of the cross-section of the third limiting groove is smaller than its web diameter, so that the third limiting groove can elastically open and close during the swinging of the connecting rods.

7. The foldable frame that can be quickly collapsed according to claim 6, characterized in that: Each of the foldable segments is connected to the adjacent main support segment via a single-link hinge joint. One end of the single-link hinge joint is fixedly connected to the adjacent main support segment, and a fourth limiting groove is formed on the upper surface of the other end along the length of the unfolded rod of the foldable segment. The diameter of the cross-section of the fourth limiting groove is smaller than its web diameter, and the fourth limiting groove can elastically open and close during the swinging of the connecting rod.

8. The foldable frame that can be quickly collapsed according to claim 7, characterized in that: On the inner side of the third limiting groove and / or the fourth limiting groove, secondary limiting grooves are respectively provided on the inner wall of the cross-sectional opening corresponding to the third transverse pin and / or the second transverse pin along the length direction of the retracted position of the corresponding connecting rod. The diameter of the cross-section of the secondary limiting groove is also smaller than its web diameter. During the swinging of the connecting rod, the secondary limiting groove can elastically open and close.

9. The foldable frame that can be quickly collapsed according to claim 7, characterized in that: The cross-sectional shape of the connecting rod is oblong, circular, elliptical, or polygonal. The cross-sectional shape of the third limiting groove and / or the fourth limiting groove is adapted to the outer contour shape of the cross-section of the connecting rod, so that the connecting rod can be reliably fixed when it is in the open state.

10. The foldable frame that can be quickly collapsed according to claim 7, characterized in that: The cross-sectional opening of the third or / and fourth limiting groove extends outward to form a flared section.

11. The foldable frame that can be quickly collapsed according to claim 8, characterized in that: The cross-sectional shape of the secondary limiting groove of the third limiting groove and / or the fourth limiting groove is adapted to the outer contour shape of the cross-section of the connecting rod.

12. The foldable frame that can be quickly collapsed according to claim 7, characterized in that: The two connecting rods of the foldable section are straight rods; there are four main support sections, all of which are arc-shaped curved rods; when the section is unfolded, each foldable section and each main support section are alternately connected in the circumferential direction to form a rounded rectangular ring structure.

13. The foldable frame that can be quickly collapsed according to claim 2, characterized in that: The supporting column is composed of multiple sleeve pipes. The sleeve pipes are provided with pin holes and / or elastic pins on their walls. The locking between the sleeve pipes is achieved by inserting the elastic pins into the pin holes.

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