Portable folding support and folding table

Abstract

The invention relates to a portable folding support and a folding table. The portable folding support comprises two upper beam rods, a lower beam rod and two foldable supporting leg units. Each foldable supporting leg unit comprises a pivoting seat fixedly connected with the corresponding end part of the lower beam rod, two lower supporting rods pivoted to the lower end of the pivoting seat, two upper supporting rods pivoted to the upper end of the pivoting seat, and a locking mechanism for locking the two lower supporting rods and the two upper supporting rods after the two lower supporting rods and the two upper supporting rods are unfolded; in each foldable supporting leg unit, the upper ends of the two upper supporting rods are respectively provided with a sliding sleeve in a pivoted mode, and the sliding sleeves at the upper ends of the two upper supporting rods are respectively sleeved on the two upper beam rods in a sliding mode, so that when the two upper supporting rods rotate and are folded towards the direction close to the lower beam rod relative to the pivoting bases, the two upper beam rods can be folded. The sliding sleeves slide inwards along the corresponding upper beam rods and pull the upper beam rods to be folded in the direction close to the lower beam rods. The portable folding support and the folding table have the advantages of being convenient and rapid to fold and unfold, high in stability when being unfolded and used and the like.

Description

Technical Field

[0001] The invention relates to the field of daily necessities, in particular to a portable folding bracket and a folding table. Background Art

[0002] Chinese utility model patent CN217906751U discloses a folding table support and a folding table. The folding table support includes a support body with an unfolded state and a folded state, and the support body includes: a crossbar; a first pivot seat, arranged at the first end of the first crossbar; a second pivot seat, arranged at the second end of the first crossbar; a rod assembly, including a first upper rod and a first lower rod hinged on the first pivot seat, and a second upper rod and a second lower rod hinged on the second pivot seat, and the first upper rod, the first lower rod, the second upper rod and the second lower rod are at least two, and the first upper rod and the second upper rod are arranged one by one; in the unfolded state of the support body, each first upper rod and each second upper rod extend upward, each first lower rod and each second lower rod extend downward, and in the folded state of the support body, the rod assembly surrounds the crossbar. The folding table includes a table top and the folding table bracket as described above, and the upper end of each first upper rod body in the folding table bracket is inserted with a first adapter, the upper end of each second upper rod body is inserted with a second adapter, and a connecting rod or a supporting rod is provided between each first adapter and the corresponding second adapter, and the table top is detachably mounted on the two connecting rods or the two supporting rods.

[0003] In the above structure, the connecting rod or the supporting rod needs to be removed from each of the first upper rod bodies and the second upper rod bodies before the bracket body can be folded, which is not convenient enough. At the same time, when the bracket body is in the unfolded state, since each of the first lower rod bodies and the second lower rod bodies are not locked, it is easy to collapse or fold accidentally during use, and the stability is not high. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a convenient folding stand and folding table which are very convenient and quick to fold and unfold and have high stability when unfolded for use.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A portable folding stand, characterized in that it comprises: two upper beams, which are arranged at intervals along the front-rear direction; a lower beam, which is located between the two upper beams; two foldable foot units, which are respectively arranged at the left and right ends of the lower beams, and each foldable foot unit comprises a pivot seat fixedly connected to the corresponding end of the lower beam, two lower support rods pivoted to the lower end of the pivot seat and can be rotated and folded in a direction close to the lower beam or rotated and extended in a direction away from the lower beam relative to the pivot seat, and two lower support rods pivoted to the upper end of the pivot seat and can be rotated and folded in a direction close to the lower beam or rotated and extended in a direction away from the lower beam relative to the pivot seat. An upper support rod and a locking mechanism for locking the two lower support rods and the two upper support rods after they are unfolded; in each foldable leg unit, a sliding sleeve is pivotally provided at the upper ends of the two upper support rods, and the sliding sleeves at the upper ends of the two upper support rods are respectively slid onto the two upper beams, so that when the two upper support rods are rotated and folded relative to the pivot seat in a direction close to the lower beam, the sliding sleeve slides inwardly along the corresponding upper beam and pulls the upper beam to fold in a direction close to the lower beam, and when the two upper support rods are rotated and unfolded relative to the pivot seat in a direction away from the lower beam, the sliding sleeve slides outwardly along the corresponding upper beam and pushes the upper beam to unfold in a direction away from the lower beam.

[0007] Furthermore, the two upper beams are on the same horizontal plane, the lower beam is centrally located between and parallel to the two upper beams, and in each foldable leg unit, the two upper support rods and the two lower support rods are equal in length.

[0008] Furthermore, the left and right ends of the two upper beams are provided with stoppers for preventing the sliding sleeve from falling out, and when the upper support rod is rotated and unfolded relative to the pivot seat in a direction away from the lower beam, the sliding sleeve just fits into the corresponding stopper.

[0009] Furthermore, the sliding sleeve includes an annular sleeve body portion and a pivot ear extending obliquely from the bottom end of the annular sleeve body portion toward the direction close to the corresponding upper support rod, wherein the annular sleeve body portion is sleeved on the corresponding upper beam rod and can slide thereon, and the pivot ear is pivotally connected to a U-shaped pivot seat preset at the upper end of the corresponding upper support rod.

[0010] Furthermore, the upper ends of the two lower support rods are each provided with a first rotating connection head, and the lower ends of the two upper support rods are each provided with a second rotating connection head, the two lower support rods are respectively rotatably connected to the lower end of the pivot seat through the first rotating connection head thereon, and the two upper support rods are respectively rotatably connected to the upper end of the pivot seat through the second rotating connection head thereon, and the first rotating connection heads of the two lower support rods are connected to each other by mutual tooth meshing, the second rotating connection heads of the two upper support rods are connected to each other by mutual tooth meshing, and the first rotating connection heads of the two lower support rods are also respectively connected to the second rotating connection heads of the two upper support rods by tooth meshing, so that the two lower support rods and the two upper support rods can be synchronously rotated and folded or synchronously rotated and unfolded.

[0011] Furthermore, the lower end of the pivot seat is symmetrically provided with two first U-shaped grooves that extend obliquely from top to bottom toward the front and rear outer sides of the lower beam, and the upper end of the pivot seat is symmetrically provided with two second U-shaped grooves that extend obliquely from bottom to top toward the front and rear outer sides of the lower beam, and the two first U-shaped grooves and the two second U-shaped grooves are arranged diagonally in a cross shape, the first rotating connecting heads of the two lower support rods extend into the corresponding first U-shaped grooves and are rotatably connected thereto via the first pin shaft, and the second rotating connecting heads of the two upper support rods extend into the corresponding second U-shaped grooves and are rotatably connected thereto via the second pin shaft, and the open ends of the two first U-shaped grooves and the two second U-shaped grooves are arranged close to the lower beam, and the closed ends of the two first U-shaped grooves and the second U-shaped grooves are arranged away from the lower beam, and the two lower support rods are blocked by the closed ends of the corresponding first U-shaped grooves after being unfolded, and the two upper support rods are blocked by the closed ends of the corresponding second U-shaped grooves after being unfolded.

[0012] Furthermore, the interior of the pivot seat is provided with a hollow cavity connected to the inner sides of the two first U-shaped grooves and the two second U-shaped grooves, and the locking mechanism includes a locking block and a locking block spring, and the locking block is movably arranged in the hollow cavity, and four locking parts are formed around the locking block, and a locking groove is respectively provided on the first rotating connecting head of the two lower support rods and the second rotating connecting head of the two upper support rods. After the two lower support rods and the two upper support rods are unfolded, the four locking parts are snapped into the corresponding locking grooves so that the two lower support rods and the two upper support rods are locked in the unfolded position, and the locking block spring acts directly or indirectly on the locking block so that the four locking parts maintain the tendency to snap into the corresponding locking grooves.

[0013] Furthermore, the locking mechanism also includes an unlocking button, which includes a rod portion and a cap portion which are integrally arranged, the rod portion penetrates into the hollow cavity and is fixedly connected to the locking block, the cap portion is exposed to the outside of the hollow cavity on a side away from the lower beam for a pressing operation when unlocking, and a through hole is provided on the cavity wall of the hollow cavity on a side away from the lower beam for the rod portion to penetrate into the hollow cavity, the locking block spring is sleeved on the rod portion, and one end of the locking block spring abuts against the cap portion, and the other end abuts against the positioning step portion in the through hole.

[0014] Furthermore, in each foldable leg unit, the lengths of the two lower support rods and the two upper support rods are less than half the length of the lower beam, so that the two foldable leg units can be symmetrically folded at the left and right ends of the lower beam; and, whether the two foldable leg units are in the unfolded state or in the folded state, the two lower support rods and the two upper support rods in one of the foldable leg units are aligned one by one with the two lower support rods and the two upper support rods in the other foldable leg unit.

[0015] A folding table comprises a table top and the above-mentioned convenient folding bracket, wherein the bottom surfaces of the left and right ends of the table top are respectively provided with a clamping platform extending in the front-to-back direction, and the left and right ends of the two upper beams are respectively provided with clamping pieces opening upward, and the clamping pieces can be detachably clamped on the ends of the corresponding clamping platforms.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Firstly, the folding bracket and folding table provided by the present invention are very convenient and quick to fold or unfold. Specifically, on the one hand, during the folding process, the rotation and folding of the two upper support rods can respectively pull the two upper beams toward the direction close to the lower beam through the upper sliding sleeves, thereby eliminating the trouble of having to remove the two upper beams before folding the bracket body in the prior art; on the other hand, during the unfolding process, the rotation and unfolding of the two upper support rods can also respectively push the two upper beams toward the direction away from the lower beam through the upper sliding sleeves, thereby eliminating the trouble of having to install the two upper beams after the bracket body is unfolded in the prior art.

[0018] Secondly, the folding stand and folding table provided by the present invention, after being unfolded, the two upper support rods and the two lower support rods in each foldable leg unit are locked by a locking mechanism. Only when the locking mechanism is unlocked can the folding stand or folding table be folded, thereby avoiding collapse or accidental folding during use, thereby improving stability and ensuring safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the portable folding bracket of the present invention.

[0020] Figure 2 It is a front view or rear view schematic diagram of the portable folding bracket of the present invention.

[0021] Figure 3 It is an exploded schematic diagram of the foldable leg unit in the present invention.

[0022] Figure 4 It is a partial enlarged view of the sliding sleeve part in the present invention.

[0023] Figure 5 It is a schematic diagram of the synchronous rotation connection of two lower support rods and two upper support rods in the present invention.

[0024] Figure 6 It is a schematic diagram of the elevation structure of the pivot seat of the present invention.

[0025] Figure 7 It is a schematic diagram of the depression angle structure of the pivot seat of the present invention.

[0026] Figure 8 It is an exploded schematic diagram of the locking mechanism in the present invention.

[0027] Fig. 9 It is a front view schematic diagram of the pivot seat of the present invention.

[0028] Fig.10 yes Fig. 9 AA cross-sectional view of .

[0029] Fig.11 It is a cross-sectional schematic diagram of the central connecting seat and the locking mechanism of the present invention along the horizontal direction.

[0030] Fig.12 It is a schematic diagram of the cooperation between the four locking parts and the corresponding locking grooves in the present invention.

[0031] Fig.13 It is a three-dimensional view of the folding table of the present invention from a low angle.

[0032] Fig.14 It is an elevation perspective view of the folding table of the present invention.

[0033] Fig.15 yes Fig.14 A is an enlarged schematic diagram.

[0034] Fig.16 It is a schematic diagram of the storage state of the folding table of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

[0036] like Figures 1 to 12As shown, the present invention provides a convenient folding bracket, comprising: two upper beams 3a, 3b, which are arranged at intervals along the front-to-back direction and are on the same horizontal plane; a lower beam 1, which is centrally located between the two upper beams 3a, 3b and is parallel to the two upper beams 3a, 3b; and two foldable leg units 2, which are respectively arranged at the left and right ends of the lower beam 1.

[0037] Each foldable leg unit 2 includes: a pivot seat 21 fixedly connected to the corresponding end of the lower beam 1, two lower support rods 22, 23 pivoted to the lower end of the pivot seat 21 and can be rotated and folded in a direction close to the lower beam 1 or rotated and unfolded in a direction away from the lower beam 1 relative to the pivot seat 21, two upper support rods 24, 25 pivoted to the upper end of the pivot seat 21 and can be rotated and folded in a direction close to the lower beam 1 or rotated and unfolded in a direction away from the lower beam 1 relative to the pivot seat 21, and a locking mechanism 26 for locking the two lower support rods 22, 23 and the two upper support rods 24, 25 after they are unfolded.

[0038] In each foldable leg unit 2, the upper ends of the two upper support rods 24, 25 are pivotally provided with a sliding sleeve 242, 252, and the sliding sleeves 242, 252 at the upper ends of the two upper support rods 24, 25 are respectively slid onto the two upper beams 3a, 3b, so that when the two upper support rods 24, 25 are rotated and folded relative to the pivot seat 21 in the direction close to the lower beam 1, the sliding sleeves 242, 252 slide inward along the corresponding upper beams 3a, 3b and pull the upper beams 3a, 3b to fold in the direction close to the lower beam 1, and when the two upper support rods 24, 25 are rotated and unfolded relative to the pivot seat 21 in the direction away from the lower beam 1, the sliding sleeves 242, 252 slide outward along the corresponding upper beams 3a, 3b and push the upper beams 3a, 3b to unfold in the direction away from the lower beam 1.

[0039] The left and right ends of the two upper beams 3a, 3b are provided with stoppers 3a1, 3b1 for preventing the sliding sleeves 242, 252 from falling out, and when the upper support rods 24, 25 are rotated relative to the pivot seat 21 in a direction away from the lower beam 1 and unfolded to the full position, the sliding sleeves 242, 252 just cooperate with the corresponding stoppers 3a1, 3b1, thereby preventing the sliding sleeves 242, 252 from falling out on the one hand, and on the other hand, it can also improve the stability of the upper support rods 24, 25 supporting the two upper beams 3a, 3b when unfolded.

[0040] The sliding sleeves 242, 252 include an annular sleeve body portion 2421, 2521 and pivot ears 2422, 2522 extending obliquely from the bottom end of the annular sleeve body portion 2421, 2521 toward the direction close to the corresponding upper support rods 24, 25, wherein the annular sleeve body portion 2421, 2521 is sleeved on the corresponding upper beam rods 3a, 3b and can slide thereon, and the pivot ears 2422, 2522 are pivotally connected to the U-shaped pivot seats 240, 250 preset at the upper ends of the corresponding upper support rods 24, 25, so that the sliding sleeves 242, 252 are pivotally arranged at the upper ends of the corresponding upper support rods 24, 25.

[0041] In each foldable leg unit 2, the two upper support rods 24, 25 and the two lower support rods 22, 23 are of equal length. The two lower support rods 22, 23 are in an outward-facing "X" shape and are located on both sides of the lower ends of the corresponding ends of the lower beam 1 after being unfolded, and the two upper support rods 24, 25 are in an inward-facing "X" shape and are located on both sides of the upper ends of the corresponding ends of the lower beam 1 after being unfolded, thereby forming two groups of roughly X-shaped support structures at the left and right ends of the lower beam 1.

[0042] The upper ends of the two lower support rods 22 and 23 are each provided with a first rotating connector 221 and 231, and the lower ends of the two upper support rods 24 and 25 are each provided with a second rotating connector 242 and 252. The two lower support rods 22 and 23 are respectively rotatably connected to the lower end of the pivot seat 21 through the first rotating connectors 221 and 231 thereon, and the two upper support rods 24 and 25 are respectively rotatably connected to the upper end of the pivot seat 21 through the second rotating connectors 242 and 252 thereon.

[0043] The first rotating connecting heads 221, 231 of the two lower support rods 22, 23 are connected together by meshing with each other, and the second rotating connecting heads 242, 252 of the two upper support rods 24, 25 are connected together by meshing with each other, and the first rotating connecting heads 221, 231 of the two lower support rods 22, 23 are also respectively connected together by meshing with the second rotating connecting heads 242, 252 of the two upper support rods 24, 25, so that the two lower support rods 22, 23 and the two upper support rods 24, 25 can be synchronously rotated and folded or synchronously rotated and unfolded. That is to say, when the foldable foot unit 2 is folded or unfolded, only one of the two lower support rods 22, 23 and the two upper support rods 24, 25 needs to be rotated to drive the other three to be synchronously rotated and folded or synchronously rotated and unfolded, so that the folding or unfolding operation of the folding bracket provided by the present invention becomes more convenient and quick.

[0044] In order to realize the above-mentioned tooth meshing connection, the proximal sides of the first rotating connecting heads 221 and 231 of the two lower support rods 22 and 23 are respectively provided with bevel tooth portions 2211 and 2311 for tooth meshing connection of the two, the distal sides of the first rotating connecting heads 221 and 231 of the two lower support rods 22 and 23 are respectively provided with bevel tooth portions 2212 and 2312, the proximal sides of the second rotating connecting heads 242 and 252 of the two upper support rods 24 and 25 are respectively provided with bevel tooth portions 2421 and 2521 for tooth meshing connection of the two, and the distal sides of the second rotating connecting heads 242 and 252 of the two upper support rods 24 and 25 are respectively provided with bevel tooth portions 2422 and 2522 which are meshed with the bevel tooth portions 2212 and 2312.

[0045] The lower end of the pivot seat 21 is symmetrically provided with two first U-shaped grooves 211, 212 which extend obliquely from top to bottom toward the front and rear outer sides of the lower beam 1, and the upper end of the pivot seat 21 is symmetrically provided with two second U-shaped grooves 213, 214 which extend obliquely from bottom to top toward the front and rear outer sides of the lower beam 1, and the two first U-shaped grooves 211, 212 and the two second U-shaped grooves 213, 214 are arranged diagonally in a cross shape, and the first rotating connectors 221, 231 of the two lower support rods 22, 23 extend into the corresponding first U-shaped grooves 211, 212 and are rotatably connected thereto through the first pin shafts 271, 272, and the second rotating connectors 242, 252 of the two upper support rods 24, 25 extend into the corresponding second U-shaped grooves 213, 214 and are rotatably connected thereto through the second pin shafts 273, 274. Moreover, the open ends 2111, 2121 of the two first U-shaped grooves 211, 212 and the open ends 2131, 2141 of the two second U-shaped grooves 213, 214 are arranged close to the lower beam 1, so that the two lower support rods 22, 23 and the two upper support rods 24, 25 can be close to the lower beam 1 after being folded; the closed ends 2112, 2122 of the two first U-shaped grooves 211, 212 and the closed ends 2112, 2122 of the two second U-shaped grooves 213, 214 The closed ends 2132, 2142 are arranged away from the lower beam 1, and the two lower support rods 22, 23 are blocked by the closed ends 2112, 2122 of the corresponding first U-shaped grooves 211, 212 after being unfolded, and the two upper support rods 24, 25 are blocked by the closed ends 2132, 2142 of the corresponding second U-shaped grooves 213, 214 after being unfolded, thereby limiting the unfolding angles of the two lower support rods 22, 23 and the two upper support rods 24, 25.

[0046] The interior of the pivot seat 21 is provided with a hollow cavity 215 which is connected to the inner sides of the two first U-shaped grooves 211, 212 and the two second U-shaped grooves 213, 214. The locking mechanism 26 includes a locking block 261 and a locking block spring 262. The locking block 261 is movably arranged in the hollow cavity 215. Four locking portions 2611, 2612, 2613, 2614 are formed around the locking block 261. The first rotating connectors 221, 231 of the two lower support rods 22, 23 and the second rotating connectors 242, 252 of the two upper support rods 24, 25 are respectively provided with a locking groove 2213, 2313 , 2423, 2523, after the two lower support rods 22, 23 and the two upper support rods 24, 25 are unfolded, the four locking parts 2611, 2612, 2613, 2614 are snapped into the corresponding locking grooves 2213, 2313, 2423, 2523 so that the two lower support rods 22, 23 and the two upper support rods 24, 25 are locked in the unfolded position, and the locking block spring 262 directly or indirectly acts on the locking block 261 so that the four locking parts 2611, 2612, 2613, 2614 maintain the tendency of being snapped into the corresponding locking grooves 2213, 2313, 2423, 2523.

[0047] The locking mechanism 26 also includes an unlocking button 263, which includes a rod portion 2631 and a cap portion 2632 that are integrally arranged. The rod portion 2631 penetrates into the hollow cavity 215 and is fixedly connected to the locking block 261. The cap portion 2632 is exposed to the outside of the side of the hollow cavity 215 away from the lower beam 1 for pressing operation when unlocking, and a through hole 2151 is provided on the cavity wall of the hollow cavity 215 on the side away from the lower beam 1 for the rod portion 2631 to penetrate into the hollow cavity 215. The locking block spring 262 is sleeved on the rod portion 2631, and one end of the locking block spring 262 is against the cap portion 2632, and the other end is against the positioning step portion 2152 in the through hole 2151. When the two lower support rods 22, 23 and the two upper support rods 24, 25 are in the unfolded state, the cap portion 2632 of the unlocking button 263 is pressed, the rod portion 2631 moves inward, and the locking block 261 moves inward accordingly and causes the four locking portions 2611, 2612, 2613, 2614 to escape from the corresponding locking grooves 2213, 2313, 2423, 2523, thereby releasing the locking of the two lower support rods 22, 23 and the two upper support rods 24, 25. At this time, the two lower support rods 22, 23 and the two upper support rods 24, 25 can be rotated and folded in the direction close to the lower beam 1.

[0048] After unfolding, the two lower support rods 22 and 23 are also tilted outward from top to bottom along the length direction L of the lower beam 1, and the two upper support rods 24 and 25 are also tilted outward from bottom to top along the length direction of the lower beam 1. This design can further improve the support stability of the portable folding bracket of the present invention after unfolding.

[0049] In each foldable leg unit 2 , the lengths of the two lower support rods 22 , 23 and the two upper support rods 24 , 25 are all less than half the length of the lower beam 1 , so that the two foldable leg units 2 can be symmetrically folded at both ends of the lower beam 1 .

[0050] Whether the two foldable leg units 2 are in the unfolded state or in the folded state, the two lower support rods 22, 23 and the two upper support rods 24, 25 in one of the foldable leg units 2 are aligned one by one with the two lower support rods 22, 23 and the two upper support rods 24, 25 in the other foldable leg unit 2.

[0051] A connecting sleeve 216 is provided on one side of the pivot seat 21 facing the lower beam 1 , and the end of the lower beam 1 is inserted into the connecting sleeve 216 and fixedly connected thereto by screws.

[0052] like Figure 4 , Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, the present invention provides a folding table, including a table top 4 and the above-mentioned portable folding bracket 5, the table top 4 is formed by a plurality of table top units being foldably connected, and a clamping platform 41 extending in the front-rear direction is respectively provided on the bottom surfaces of the left and right ends of the table top 4, and the left and right ends of the two upper beams 3a, 3b are respectively provided with clamping members 3a2, 3b2 opening upward, and the clamping members 3a2, 3b2 are detachably clamped on the ends of the corresponding clamping platforms 41, so that the table top 4 can be removed from the portable folding bracket 5 for folding and storage when not in use. At the same time, in order to facilitate manufacturing, the clamping members 3a2, 3b2 at the left and right ends of the two upper beams 3a, 3b are designed to be integrated with the stoppers 3a1, 3b1, and specifically, the clamping members 3a2, 3b2 are formed on the stoppers 3a1, 3b1.

[0053] The above is only a preferred embodiment of the present invention, and should not be used to limit the scope of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the patent of the present invention.

Claims

1. A portable folding stand, characterized in that: include: two upper beams, arranged at intervals along the front-rear direction; A lower beam rod is located between the lower parts of the two upper beam rods; Two foldable leg units, respectively arranged at the left and right ends of the lower beam, and each foldable leg unit includes a pivot seat fixedly connected to the corresponding end of the lower beam, two lower support rods pivoted to the lower end of the pivot seat and capable of rotating and folding relative to the pivot seat in a direction close to the lower beam or rotating and unfolding in a direction away from the lower beam, two upper support rods pivoted to the upper end of the pivot seat and capable of rotating and folding relative to the pivot seat in a direction close to the lower beam or rotating and unfolding in a direction away from the lower beam, and a locking mechanism for locking the two lower support rods and the two upper support rods after they are unfolded; In each foldable leg unit, the upper ends of the two upper support rods are pivotally provided with a sliding sleeve, and the sliding sleeves at the upper ends of the two upper support rods are respectively slid onto the two upper beams, so that when the two upper support rods are rotated and folded relative to the pivot seat in a direction close to the lower beam, the sliding sleeves slide inwards along the corresponding upper beams and pull the upper beams to fold in a direction close to the lower beam, and when the two upper support rods are rotated and unfolded relative to the pivot seat in a direction away from the lower beam, the sliding sleeves slide outwards along the corresponding upper beams and push the upper beams to unfold in a direction away from the lower beam.

2. A portable folding stand according to claim 1, characterized in that: The two upper beams are on the same horizontal plane, the lower beam is centrally located between the lower parts of the two upper beams and is parallel to the two upper beams, and in each foldable leg unit, the two upper support rods and the two lower support rods are of equal length.

3. The portable folding stand according to claim 1, characterized in that: The left and right ends of the two upper beams are both provided with stoppers for preventing the sliding sleeve from falling out, and when the upper support rod is rotated relative to the pivot seat in a direction away from the lower beam to be unfolded into place, the sliding sleeve just fits with the corresponding stopper.

4. The portable folding stand according to claim 1, characterized in that: The sliding sleeve includes an annular sleeve body and a pivot ear extending obliquely from the bottom end of the annular sleeve body toward the direction close to the corresponding upper support rod, wherein the annular sleeve body is sleeved on the corresponding upper beam rod and can slide thereon, and the pivot ear is pivotally connected to a U-shaped pivot seat preset at the upper end of the corresponding upper support rod.

5. A portable folding stand according to claim 1 or 2 or 3 or 4, characterized in that: The upper ends of the two lower support rods are each provided with a first rotating connection head, and the lower ends of the two upper support rods are each provided with a second rotating connection head, the two lower support rods are respectively rotatably connected to the lower end of the pivot seat through the first rotating connection head thereon, and the two upper support rods are respectively rotatably connected to the upper end of the pivot seat through the second rotating connection head thereon, and the first rotating connection heads of the two lower support rods are connected together by mutual tooth meshing, the second rotating connection heads of the two upper support rods are connected together by mutual tooth meshing, and the first rotating connection heads of the two lower support rods are also respectively connected together by tooth meshing with the second rotating connection heads of the two upper support rods, so that the two lower support rods and the two upper support rods can be synchronously rotated and folded or synchronously rotated and unfolded.

6. A portable folding stand according to claim 5, characterized in that: The lower end of the pivot seat is symmetrically provided with two first U-shaped grooves that extend obliquely from top to bottom toward the front and rear outer sides of the lower beam, and the upper end of the pivot seat is symmetrically provided with two second U-shaped grooves that extend obliquely from bottom to top toward the front and rear outer sides of the lower beam, and the two first U-shaped grooves and the two second U-shaped grooves are arranged diagonally in a cross shape, the first rotating connecting heads of the two lower support rods extend into the corresponding first U-shaped grooves and are rotatably connected thereto through the first pin shaft, and the second rotating connecting heads of the two upper support rods extend into the corresponding second U-shaped grooves and are rotatably connected thereto through the second pin shaft, and the open ends of the two first U-shaped grooves and the two second U-shaped grooves are arranged close to the lower beam, and the closed ends of the two first U-shaped grooves and the second U-shaped grooves are arranged away from the lower beam, and the two lower support rods are blocked by the closed ends of the corresponding first U-shaped grooves after unfolding, and the two upper support rods are blocked by the closed ends of the corresponding second U-shaped grooves after unfolding.

7. A portable folding stand according to claim 6, characterized in that: The interior of the pivot seat is provided with a hollow cavity that is connected to the inner sides of the two first U-shaped grooves and the two second U-shaped grooves, and the locking mechanism includes a locking block and a locking block spring, and the locking block is movably arranged in the hollow cavity, and four locking parts are formed around the locking block, and the first rotating connecting head of the two lower support rods and the second rotating connecting head of the two upper support rods are respectively provided with a locking groove, and after the two lower support rods and the two upper support rods are unfolded, the four locking parts are snapped into the corresponding locking grooves so that the two lower support rods and the two upper support rods are locked in the unfolded position, and the locking block spring directly or indirectly acts on the locking block so that the four locking parts maintain the tendency to snap into the corresponding locking grooves.

8. The portable folding stand according to claim 7, characterized in that: The locking mechanism also includes an unlocking button, which includes a rod portion and a cap portion which are integrally arranged, the rod portion being inserted into the hollow cavity and fixedly connected to the locking block, the cap portion being exposed to the outside of the hollow cavity on a side away from the lower beam for a pressing operation when unlocking, and a through hole for the rod portion to penetrate into the hollow cavity is provided on the cavity wall on a side away from the lower beam, the locking block spring is sleeved on the rod portion, and one end of the locking block spring is abutted against the cap portion, and the other end is abutted against the positioning step portion in the through hole.

9. A portable folding stand according to claim 1 or 2 or 3 or 4, characterized in that: In each foldable leg unit, the lengths of the two lower support rods and the two upper support rods are less than half the length of the lower beam, so that the two foldable leg units can be symmetrically folded at the left and right ends of the lower beam; and, whether the two foldable leg units are in the unfolded state or in the folded state, the two lower support rods and the two upper support rods in one of the foldable leg units are aligned one by one with the two lower support rods and the two upper support rods in the other foldable leg unit.

10. A folding table, characterized in that: It comprises a table top and the convenient folding bracket as described in any one of claims 1 to 9, wherein the bottom surfaces of the left and right ends of the table top are respectively provided with a clamping platform extending in the front-to-back direction, and the left and right ends of the two upper beams are respectively provided with clamping parts opening upward, and the clamping parts can be detachably clamped on the ends of the corresponding clamping platforms.

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