Portable folding table

Abstract

A portable folding table comprises a table top and a table top supporting frame, and the table top supporting frame comprises two transverse rods, two longitudinal rods and four supporting legs; each longitudinal rod comprises two rod sections, the close ends of the two rod sections are hinged to each other, and the far ends of the two rod sections are hinged to the corresponding ends of the two transverse rods respectively. Locking structures are arranged at the close ends of the two rod sections of each longitudinal rod, and stopping components are arranged at the far ends of the two rod sections of each longitudinal rod; when the two rod sections of each longitudinal rod are located at the unfolding positions, the two rod sections are locked by the locking structures and cannot be rotationally folded, the stopping parts at the far ends of the two rod sections are located at the stopping positions so that the supporting legs cannot be rotationally folded, and at the moment, if the locking structures are unlocked, the two rod sections can be rotationally folded, so that the supporting legs cannot be rotationally folded. And the stopping parts at the far ends of the two rod sections are switched to non-stopping positions along with rotation, so that the supporting legs are rotated and folded. The portable folding table is high in stability when being unfolded for use, and is convenient and smooth to fold.

Description

Technical Field

[0001] The present invention relates to a table, and more particularly to a portable folding table. Background Art

[0002] Chinese Utility Model Patent CN222692931U discloses an outdoor folding table, which includes a frame and a tabletop. The tabletop is detachably connected to the frame. The frame includes two cross bars, two vertical bars, table legs and folding assemblies. The vertical bars are respectively arranged at both ends of the cross bars and are hinged to the cross bars. Table legs are provided at positions close to the vertical bars at both ends of the cross bar, and the table legs are hinged to the cross bar. Each table leg is provided with the folding assembly, and both ends of the folding assembly are respectively connected to the table leg and the vertical bar. When the frame is folded, the folding assembly drives the table legs to fold synchronously. This outdoor folding table has the following design deficiencies:

[0003] First, when the outdoor folding table is unfolded and used, neither the hinge joints of the two vertical bars nor the hinge joints of the table legs are locked. This results in an unstable state of the two vertical bars and the table legs during use, and it is extremely easy to accidentally fold due to the load on the tabletop, thus causing the outdoor folding table to collapse and endangering the use safety.

[0004] Second, this outdoor folding table uses a method of driving the table legs to fold synchronously by two vertical bars through the folding assembly. In the actual folding process, there is an easy problem of mutual interference, resulting in unsmooth folding and affecting the user experience. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above deficiencies of the prior art and provide an outdoor folding table with high stability and smooth folding when unfolded.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A portable folding table, comprising a tabletop and a tabletop support frame. The tabletop support frame includes two cross bars, two longitudinal bars and four legs. Among them, the two cross bars are arranged at intervals facing each other. The two longitudinal bars are respectively arranged between the two ends of the two cross bars. The four legs are respectively hinged to the two ends of the two cross bars. Each longitudinal bar includes two rod segments. The adjacent ends of the two rod segments are hinged to each other. The opposite ends of the two rod segments are respectively hinged to the corresponding ends of the two cross bars. Locking structures are provided at the adjacent ends of the two rod segments of each longitudinal bar, and a stop member is respectively provided at the opposite ends of the two rod segments of each longitudinal bar. When the two rod segments of each longitudinal bar are in the unfolded position, the two rod segments are locked by the locking structure and cannot be rotated and folded, and the stop members at the opposite ends of the two rod segments are in the stop position to prevent the corresponding legs from being rotated and folded, so that the legs cannot be rotated and folded. At this time, if the locking structure is unlocked, the two rod segments can be rotated and folded, and the stop members at the opposite ends of the two rod segments can follow the rotation of the two rod segments and switch to the non-stop position that does not prevent the corresponding legs from being rotated and folded, and then the legs can be rotated and folded.

[0008] Further, the two rod segments of each longitudinal bar are respectively defined as a first rod segment and a second rod segment. A first hinge block is provided at one end of the first rod segment close to the second rod segment. A second hinge block and a third hinge block spaced below the second hinge block are provided at one end of the second rod segment close to the first rod segment. The first hinge block is embedded between the second hinge block and the third hinge block. The first hinge block is provided with a first hinge hole in the up and down direction. The second hinge block is provided with a second hinge hole in the up and down direction. The third hinge block is provided with a third hinge hole in the up and down direction. A first hinge shaft passes through the first hinge hole, the second hinge hole and the third hinge hole to hinge the adjacent ends of the first rod segment and the second rod segment to each other.

[0009] Further, the locking structure includes a limit block formed on the upper part of the first hinge shaft and a limit groove formed on the upper part of the first hinge hole. The first hinge shaft is movably arranged up and down. When the first hinge shaft is in the lower position, the limit block is snapped into the limit groove so that the first rod segment and the second rod segment are locked and cannot be rotated and folded. When the first hinge shaft is in the upper position, the limit block disengages from the limit groove so that the first rod segment and the second rod segment are unlocked and can be rotated and folded.

[0010] Furthermore, the limiting block, the limiting groove and the second hinge hole are all trapezoidal structures concentric with the first hinge shaft, and the sizes of the limiting groove and the second hinge hole are adapted to the size of the limiting block. When the first hinge shaft is in the upper position, the limiting block disengages from the limiting groove and enters the second hinge hole. At this time, if the first rod segment and the second rod segment are rotated and folded, the limiting block and the first hinge shaft can be driven to rotate together with the second rod segment, and the limiting block is rotated from a state aligned with the limiting groove to a non-aligned state, so as to ensure that the limiting block will not fall back into the limiting groove during the rotation and folding of the first rod segment and the second rod segment.

[0011] Furthermore, the locking structure further includes an unlocking button provided at the lower end of the first hinge shaft and a return spring sleeved on the lower part of the first hinge shaft, with one end abutting against the unlocking button and the other end abutting against the third hinge block. When the first hinge shaft is in the lower position, pressing the unlocking button upward can move the first hinge shaft upward to the upper position, and compress the return spring so that the first hinge shaft and the limiting block maintain a downward reset trend.

[0012] Furthermore, the lower surface of the third hinge block is provided with an annular boss concentric with the third hinge hole and having an inner diameter larger than the diameter of the third hinge hole. The first hinge shaft also passes through the annular boss. The return spring is placed in the annular boss. The unlocking button is screwed to the part of the lower end of the first hinge shaft passing through the annular boss, and an avoidance groove for avoiding the annular boss is provided at the upper end of the unlocking button. One end of the return spring abuts against the lower surface of the third hinge block, and the other end abuts against the bottom wall of the avoidance groove.

[0013] Furthermore, a upper stop portion is provided at the part of the upper end of the first hinge shaft passing through the second hinge hole and is in stop cooperation with the upper surface of the second hinge block, so that the first hinge shaft will not be disengaged downward from the first hinge hole, the second hinge hole and the third hinge hole.

[0014] Furthermore, the first hinge block is arranged on the outer side of the end of the first rod segment close to the second rod segment, the second hinge block and the third hinge block are arranged on the outer side of the end of the second rod segment close to the first rod segment, and a limiting card slot is provided on the inner side of the end of the first rod segment close to the second rod segment, and a limiting card block is provided on the inner side of the end of the second rod segment close to the first rod segment. When the first rod segment and the second rod segment are in the unfolded position, the limiting card block is snapped into the limiting card slot.

[0015] Further, a fourth hinge block is provided at each end of each cross bar. The fourth hinge block is provided with a cavity opening towards the inner side and the lower side. A hinge head is provided at the upper end of each leg. The hinge head extends into the cavity of the corresponding fourth hinge block and is hinged to the two side walls of the cavity by a second hinge shaft. Each stop member is rotatably sleeved on the corresponding fourth hinge block, and an opening is provided on one circumferential side of the stop member. When the two rod segments of each longitudinal rod are in the deployed position, the opening is staggered from the inner opening of the cavity, so that the hinge head is blocked by the stop member and cannot rotate inwards. When the two rod segments of each longitudinal rod are in the folded position, the opening is aligned with the inner opening of the cavity, so that the hinge head is not blocked by the stop member and can rotate inwards.

[0016] Further, the distal ends of the two rod segments of each longitudinal rod are respectively hinged to the upper part of the corresponding fourth hinge block by a third hinge shaft.

[0017] Further, a placing platform is respectively provided on the inner sides facing each other of the two cross bars, and a buckling platform is respectively provided on the outer sides facing each other of the two cross bars; the buckling platform includes a groove portion located on the inner side and extending along the length direction of the corresponding cross bar and a platform portion located on the outer side and extending along the length direction of the corresponding cross bar. A first limiting convex strip in the shape of a circular arc protrusion is provided on the inner wall of the groove portion close to the placing platform, and a second limiting convex strip with an outward arc-shaped pointed top is provided on the outer wall of the platform portion away from the groove portion; the table top includes a plurality of table board units. A placing portion is provided on one side of the lower end of each table board unit, and a first buckling portion and a second buckling portion are provided on the other side of the lower end of each table board unit. Each table board unit can be placed on the placing platforms of the two cross bars through the placing portion and the first buckling portion, or can be buckled on the buckling platform of any one cross bar through the first buckling portion and the second buckling portion; and when the table board unit is buckled on the buckling platform of any one cross bar, the first buckling portion enters the groove portion and is buckled on the first limiting convex strip, and the second buckling portion is buckled on the second limiting convex strip.

[0018] The present invention has the following beneficial effects:

[0019] First of all, when the outdoor folding table of the present invention is unfolded and used, not only the two rod segments of each longitudinal rod are locked by the locking structure, but also each leg is blocked by the stop member and is in a locked state. Therefore, the stability during use is high, and there will be no accidental folding phenomenon, and the safety is good.

[0020] Secondly, the desktop support frame in the outdoor folding table of the present invention adopts a partial folding method, that is, first rotate the two longitudinal rods inward to fold them, so that the two cross rods come closer together, and then rotate each leg inward to fold it until it comes closer to the two cross rods. Since the step-by-step folding method is adopted, there will be no problem of mutual interference during the folding process, thus ensuring the smoothness of folding and a good user experience.

[0021] Furthermore, in the present invention, only when the two longitudinal rods are rotated and folded in place and drive the stop components at their two ends to rotate to the non-stop position, can each leg be rotated and folded. In this way, it can avoid the trouble that users don't know whether to fold the two longitudinal rods first or each leg first every time they fold and store, thus facilitating the use of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of a portable folding table of the present invention.

[0023] Figure 2 is a three-dimensional schematic diagram of the desktop support frame described in the present invention.

[0024] Figure 3 is Figure 2 a partial enlarged schematic diagram of A in

[0025] Figure 4 is Figure 3 a decomposition schematic diagram of the partial structure shown in Figure 1 。

[0026] Figure 5 is Figure 3 a decomposition schematic diagram of the partial structure shown in Figure 2 。

[0027] Figure 6 is a side schematic diagram of the desktop support frame described in the present invention. In the figure, part B is partially sectioned.

[0028] Figure 7 is Figure 6 a partial enlarged schematic diagram of B in

[0029] Figure 8 is a sectional schematic diagram of the locking structure in the unlocked state of the present invention.

[0030] Figure 9 is an outer perspective decomposition schematic diagram of the hinged structure and the locking structure at the adjacent ends of the two rod segments of each longitudinal rod in the present invention.

[0031] Figure 10 is an inner perspective decomposition schematic diagram of the hinged structure and the locking structure at the adjacent ends of the two rod segments of each longitudinal rod in the present invention.

[0032] Figure 11 It is a schematic structural view of the first hinge shaft described in the present invention.

[0033] Figure 12 It is a schematic cross-sectional view of the tabletop unit of the present invention buckled on the buckling platform of any one of the cross bars.

[0034] Figure 13 It is a schematic cross-sectional view of the tabletop unit described in the present invention.

[0035] Figure 14 It is a schematic view of the semi-folded state of the tabletop support frame described in the present invention.

[0036] Figure 15 is Figure 14 a partial enlarged view of C in

[0037] Figure 16 It is a schematic view of the fully folded state of the tabletop support frame described in the present invention. Detailed implementation manners

[0038] The present invention will be further described in detail below with reference to the embodiments given in the drawings.

[0039] As Figures 1 to 16 shown, a portable folding table provided by the present invention includes a tabletop 1 and a tabletop support frame 2. The tabletop support frame 2 includes two cross bars 21, two longitudinal bars 22 and four legs 23. Among them, the two cross bars 21 are arranged at intervals facing each other, the two longitudinal bars 22 are respectively arranged between the two ends of the two cross bars 21, and the four legs 23 are respectively hinged to the two ends of the two cross bars 21.

[0040] Each longitudinal bar 22 includes two rod segments 221 and 222. The adjacent ends of the two rod segments 221 and 222 are hinged to each other, and the opposite ends of the two rod segments 221 and 222 are respectively hinged to the corresponding ends of the two cross bars 21.

[0041] Locking structures 24 are provided at the adjacent ends of the two rod segments 221 and 222 of each longitudinal bar 22, and a stop member 25 is provided at each of the opposite ends of the two rod segments 221 and 222 of each longitudinal bar 22.

[0042] When the two rod segments 221 and 222 of each vertical rod 22 are in the deployed position, the two rod segments 221 and 222 are locked by the locking structure 24 and cannot be rotated and folded, and the stop members 25 at the far ends of the two rod segments 221 and 222 are in the stop position to prevent the corresponding leg 23 from rotating and folding, so that the corresponding leg 23 cannot be rotated and folded. At this time, if the locking structure 24 is unlocked, the two rod segments 221 and 222 can be rotated and folded, and the stop members 25 at the far ends of the two rod segments 221 and 222 follow the rotation of the two rod segments 221 and 222 and switch to the non-stop position that does not prevent the corresponding leg 23 from rotating and folding, and then the corresponding leg 23 can be rotated and folded.

[0043] In an embodiment of the present invention, the two rod segments 221 and 222 of each vertical rod 22 are respectively defined as a first rod segment 221 and a second rod segment 222. A first hinge block 2211 is provided at one end of the first rod segment 221 close to the second rod segment 222. A second hinge block 2221 and a third hinge block 2222 spaced below the second hinge block 2221 are provided at one end of the second rod segment 222 close to the first rod segment 221. The first hinge block 2211 is embedded between the second hinge block 2221 and the third hinge block 2222, and a first hinge hole 2212 is formed in the first hinge block 2211 in the up and down direction. A second hinge hole 2223 is formed in the second hinge block 2221 in the up and down direction. A third hinge hole 2224 is formed in the third hinge block 2222 in the up and down direction. A first hinge shaft 26 passes through the first hinge hole 2212, the second hinge hole 2223 and the third hinge hole 2224 so that the adjacent ends of the first rod segment 221 and the second rod segment 222 are hinged to each other.

[0044] The locking structure 24 includes a limit block 241 formed on the upper part of the first hinge shaft 26 and a limit groove 242 formed on the upper part of the first hinge hole 2212. The first hinge shaft 26 is movably arranged up and down. When the first hinge shaft 26 is in the lower position, the limit block 241 is snapped into the limit groove 242 so that the first hinge block 2211 is locked with the second hinge block 2221 and the third hinge block 2222, and further the first rod segment 221 and the second rod segment 222 are locked and cannot be rotated and folded. When the first hinge shaft 26 is in the upper position, the limit block 241 is disengaged from the limit groove 242 so that the locking between the first hinge block 2211 and the second hinge block 2221 and the third hinge block 2222 is released, and further the first rod segment 221 and the second rod segment 222 are unlocked and can be rotated and folded.

[0045] The limiting block 241, the limiting groove 242, and the second hinge hole 2223 are all trapezoidal structures concentric with the first hinge shaft 26, and the sizes of the limiting groove 242 and the second hinge hole 2223 are adapted to the size of the limiting block 241. When the first hinge shaft 26 is in the upper position, the limiting block 241 disengages from the limiting groove 242 and enters the second hinge hole 2223. At this time, if the first rod segment 221 and the second rod segment 222 are rotated and folded, due to the trapezoidal structures of the limiting block 241 and the second hinge hole 2223 being mutually adapted, the limiting block 241 and the first hinge shaft 26 can be driven to rotate together with the second rod segment 222, and the trapezoidal limiting block 241 is rotated from a state aligned with the trapezoidal limiting groove 242 to a non-aligned state, thus ensuring that the limiting block 241 will not fall back into the limiting groove 242 during the rotation and folding of the first rod segment 221 and the second rod segment 222. Only when the first rod segment 221 and the second rod segment 222 are re-expanded and the trapezoidal limiting block 241 returns to a state aligned with the trapezoidal limiting groove 242 can the limiting block 241 fall back into the limiting groove 242 to lock the first rod segment 221 and the second rod segment 222. Thereby, the smoothness of the first rod segment 221 and the second rod segment 222 during the rotation and folding process and the unfolding process can be improved.

[0046] The locking structure 24 further includes an unlocking button 243 provided at the lower end of the first hinge shaft 26 and a return spring 244 sleeved on the lower part of the first hinge shaft 26 with one end abutted against the unlocking button 243 and the other end abutted against the third hinge block 2222. When the first hinge shaft 26 is in the lower position, pressing the unlocking button 243 upward can move the first hinge shaft 26 upward to the upper position, thereby realizing the unlocking of the locking structure 24. When the first hinge shaft 26 is in the upper position, the return spring 244 is in a compressed state, causing the first hinge shaft 26 and the limiting block 241 to maintain a downward reset trend, that is, when no external force acts on the first hinge shaft 26, the first hinge shaft 26 and the limiting block 241 can automatically return downward under the reset action of the return spring 244.

[0047] The lower surface 2222a of the third hinge block 2222 is provided with an annular boss 2225 that is concentric with the third hinge hole 2224 and has an inner diameter larger than the diameter of the third hinge hole 2224. The first hinge shaft 26 also passes through the annular boss 2225. The return spring 244 is placed inside the annular boss 2225. The unlocking button 243 is screwed onto the part of the lower end of the first hinge shaft 26 that passes out of the annular boss 2225. And an avoidance groove 2431 for avoiding the annular boss 2225 is provided at the upper end of the unlocking button 243. One end of the return spring 244 abuts against the lower surface 2222a of the third hinge block 2222, and the other end abuts against the bottom wall 2431a of the avoidance groove 2431. Therefore, when the unlocking button 243 is pressed upward, not only can the first hinge shaft 26 be displaced upward, but also the return spring 244 can be in a compressed state.

[0048] A upper stop portion 261 that is in stop cooperation with the upper surface of the second hinge block 2221 is provided on the part of the upper end of the first hinge shaft 26 that passes out of the second hinge hole 2223, so that the first hinge shaft 26 will not drop out of the first hinge hole 2212, the second hinge hole 2223, and the third hinge hole 2224 downward.

[0049] The first hinge block 2211 is arranged on the outer side of the first rod section 221 near one end close to the second rod section 222. The second hinge block 2221 and the third hinge block 2222 are arranged on the outer side of the second rod section 222 near one end close to the first rod section 221. And a limit card slot 2213 is provided on the inner side of the first rod section 221 near one end close to the second rod section 222. A limit card block 2226 is provided on the inner side of the second rod section 222 near one end close to the first rod section 221. When the first rod section 221 and the second rod section 222 are in the unfolded position, the limit card block 2226 is snapped into the limit card slot 2213.

[0050] In one embodiment of the present invention, each cross bar 21 is provided with a fourth hinge block 211 at both ends, and a cavity 2111 opening toward the inside and the bottom is provided at the lower part of the fourth hinge block 211. A hinge head 231 is provided at the upper end of each leg 23, and the hinge head 231 extends into the cavity 2111 of the corresponding fourth hinge block 211 and is hinged to the two side walls of the cavity 2111 through a second hinge shaft 27. Each stopper component 25 can be rotatably sleeved on the corresponding fourth hinge block 211, and an opening portion 251 is provided on one circumferential side of the stopper component 25. When each longitudinal bar 22 When the two rod sections 221, 222 are in the unfolded position, the opening 251 is in a position offset from the inner opening 2111a of the cavity 2111, so that the hinged joint 231 is stopped by the stopping component 25 and cannot rotate inwards, that is, the supporting leg 23 cannot be rotated inwards and folded; when the two rod sections 221, 222 of each longitudinal rod 22 are in the folded position, the opening 251 is in a position facing the inner opening 2111a of the cavity 2111, so that the hinged joint 231 is not stopped by the stopping component 25 and can rotate inwards, that is, the supporting leg 23 can be rotated inwards and folded.

[0051] The two rod sections 221, 222 of each longitudinal rod 22 are respectively hinged to the upper part of the corresponding fourth hinge block 211 through a third hinge shaft 28. The second hinge shaft 27 is horizontally arranged, and the third hinge shaft 28 is vertically arranged, and the third hinge shaft 28 and the hinge head 231 are on the same vertical center line.

[0052] In one embodiment of the present invention, a mounting platform 212 is respectively provided on the inner sides of the two cross bars 21, and a buckle platform 213 is respectively provided on the outer sides of the two cross bars 21. The buckle platform 213 includes a groove portion 2131 located on the inner side and extending along the length direction of the corresponding cross bar 21, and a platform portion 2132 located on the outer side and extending along the length direction of the corresponding cross bar 21, and a first position-limiting convex strip 2131a in the shape of a circular arc protrusion is provided on the inner wall of the groove portion 2131 close to the mounting platform 212, and a second position-limiting convex strip 2132a in the shape of an arc-shaped pointed top is provided on the outer wall of the platform portion 2132 away from the groove portion 2131. The desktop 1 includes a plurality of tabletop units 1a, each of which is provided with a lap portion 1a1 on one side of the lower end, and a first buckle portion 1a2 and a second buckle portion 1a3 on the other side of the lower end of each tabletop unit 1a. Each tabletop unit 1a can be lapped on the lap platform 212 of two crossbars 21 through the lap portion 1a1 and the first buckle portion 1a2, or can be buckled on the buckle platform 213 of any crossbar 21 through the first buckle portion 1a2 and the second buckle portion 1a3. Furthermore, when the tabletop unit 1a is buckled on the buckle platform 213 of any crossbar 21, the first buckle portion 1a2 enters the groove portion 2131 and buckles with the first position-limiting convex strip 2131a, and the second buckle portion 1a3 buckles with the second position-limiting convex strip 2132a.

[0053] When the portable folding table of the present invention needs to be folded, the tabletop unit 1a is first disassembled from the two horizontal bars 21, and then the locking structures 24 on the two longitudinal bars 22 are unlocked, and after unlocking, the two longitudinal bars 22 are rotated and folded inwards to make the two horizontal bars 21 close together, and finally, after the two longitudinal bars 22 are rotated and folded into place, each leg 23 is rotated and folded inwards to be close to the corresponding horizontal bar 21. In the folding process, since the two longitudinal bars 22 and each leg 23 are folded step by step, the problem of mutual interference between the two during the folding process can be avoided, thereby ensuring the smoothness of folding.

[0054] 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 table, comprising a tabletop and a tabletop support frame, wherein the tabletop support frame includes two cross bars, two longitudinal bars and four legs. Among them, Two cross bars are arranged at intervals facing each other. Two longitudinal bars are respectively arranged between the two ends of the two cross bars. Four legs are respectively hinged to the two ends of the two cross bars; Each longitudinal bar includes two rod segments. The adjacent ends of the two rod segments are hinged to each other, and the opposite ends of the two rod segments are respectively hinged to the corresponding ends of the two cross bars; It is characterized in that: Locking structures are arranged at the adjacent ends of the two rod segments of each longitudinal bar, and a stop member is arranged at each of the opposite ends of the two rod segments of each longitudinal bar; When the two rod segments of each longitudinal bar are in the unfolded position, the two rod segments are locked by the locking structure and cannot be rotated and folded, and the stop members at the opposite ends of the two rod segments are in the stop position to prevent the corresponding legs from being rotated and folded, so that the legs cannot be rotated and folded. At this time, if the locking structure is unlocked, the two rod segments can be rotated and folded, and the stop members at the opposite ends of the two rod segments can follow the rotation of the two rod segments and switch to a non-stop position that does not prevent the corresponding legs from being rotated and folded, and then the legs can be rotated and folded.

2. A portable folding table according to claim 1, characterized in that: The two rod segments of each longitudinal bar are respectively defined as a first rod segment and a second rod segment. A first hinge block is arranged at one end of the first rod segment close to the second rod segment. A second hinge block and a third hinge block spaced below the second hinge block are arranged at one end of the second rod segment close to the first rod segment. The first hinge block is embedded between the second hinge block and the third hinge block. The first hinge block is provided with a first hinge hole in the up and down direction. The second hinge block is provided with a second hinge hole in the up and down direction. The third hinge block is provided with a third hinge hole in the up and down direction. A first hinge shaft passes through the first hinge hole, the second hinge hole and the third hinge hole to hinge the adjacent ends of the first rod segment and the second rod segment to each other.

3. A portable folding table according to claim 2, wherein: The locking structure includes a limit block formed on the upper part of the first hinge shaft and a limit groove formed on the upper part of the first hinge hole. The first hinge shaft is arranged to be movable up and down. When the first hinge shaft is in the lower position, the limit block is snapped into the limit groove so that the first rod segment and the second rod segment are locked and cannot be rotated and folded. When the first hinge shaft is in the upper position, the limit block disengages from the limit groove so that the first rod segment and the second rod segment are unlocked and can be rotated and folded.

4. A portable folding table according to claim 3, wherein: The limit block, the limit groove and the second hinge hole are all trapezoidal structures concentric with the first hinge shaft, and the sizes of the limit groove and the second hinge hole are adapted to the size of the limit block. When the first hinge shaft is in the upper position, the limit block disengages from the limit groove and enters the second hinge hole. At this time, if the first rod segment and the second rod segment are rotated and folded, the limit block and the first hinge shaft can be driven to rotate together with the second rod segment, and the limit block can be rotated from a state aligned with the limit groove to a non-aligned state, so as to ensure that the limit block will not fall back into the limit groove during the rotation and folding of the first rod segment and the second rod segment.

5. A portable folding table according to claim 3 or 4, characterized in that: The locking structure also includes an unlocking button arranged at the lower end of the first hinge shaft and a return spring which is sleeved on the lower part of the first hinge shaft and has one end abutting against the unlocking button and the other end abutting against the third hinge block. When the first hinge shaft is in the lower position, pressing the unlocking button upwards can move the first hinge shaft upward to the upper position, and make the return spring in a compressed state so that the first hinge shaft and the limit block maintain a tendency to return downward.

6. The portable folding table according to claim 5, wherein: The lower surface of the third hinge block is provided with an annular boss which is concentric with the third hinge hole and has an inner diameter larger than the diameter of the third hinge hole. The first hinge shaft also passes through the annular boss. The return spring is arranged in the annular boss. The unlocking button is screwed to the part of the lower end of the first hinge shaft which passes through the annular boss. The upper end of the unlocking button is provided with an avoidance groove for avoiding the annular boss. One end of the return spring abuts against the lower surface of the third hinge block, and the other end abuts against the bottom wall of the avoidance groove.

7. A portable folding table according to claim 2 or 3 or 4, characterized in that: The portion of the upper end of the first hinge shaft that passes through the second hinge hole is provided with an upper stop portion that cooperates with the upper surface stop of the second hinge block, so that the first hinge shaft will not slip downward out of the first hinge hole, the second hinge hole and the third hinge hole.

8. A portable folding table according to claim 2 or 3 or 4, characterized in that: The first hinge block is arranged on the outer side of the first rod segment near one end of the second rod segment, the second hinge block and the third hinge block are arranged on the outer side of the second rod segment near one end of the first rod segment, and a limiting slot is provided on the inner side of one end of the first rod segment near the second rod segment, and a limiting block is provided on the inner side of one end of the second rod segment near the first rod segment, and when the first rod segment and the second rod segment are in the expanded position, the limiting block is inserted into the limiting slot.

9. A portable folding table according to claim 1, characterized in that: A fourth hinge block is provided at both ends of each cross bar, and the fourth hinge block is provided with a cavity opening toward the inside and the bottom. A hinge head is provided at the upper end of each leg, and the hinge head extends into the cavity of the corresponding fourth hinge block and is hinged to the two side walls of the cavity through a second hinge shaft. Each stop member can be rotatably sleeved on the corresponding fourth hinge block, and an opening portion is provided on one circumferential side of the stop member. When the two rod sections of each longitudinal rod are in the unfolded position, the opening portion is in a position staggered from the inner opening of the cavity, so that the hinge head is stopped by the stop member and cannot rotate inwardly. When the two rod sections of each longitudinal rod are in the folded position, the opening portion is in a position facing the inner opening of the cavity, so that the hinge head can rotate inwardly without being stopped by the stop member.

10. A portable folding table according to claim 9, characterized in that: The far ends of the two rod sections of each longitudinal rod are respectively hinged to the upper part of the corresponding fourth hinge block through a third hinge shaft.

11. A portable folding table according to claim 1, characterized in that: One placing platform is respectively arranged on the inner sides facing each other of the two cross bars, and one buckling platform is respectively arranged on the outer sides facing each other of the two cross bars; the buckling platform includes a groove part located on the inner side and extending along the length direction of the corresponding cross bar and a platform part located on the outer side and extending along the length direction of the corresponding cross bar. A first limiting convex strip in the shape of an arc-shaped protrusion is arranged on the inner wall of the groove part close to the placing platform, and a second limiting convex strip in the shape of an arc-shaped spire protruding outwards is arranged on the outer wall of the platform part far away from the groove part; the tabletop includes a plurality of table board units. A placing part is arranged on one side of the lower end of each table board unit, and a first buckling part and a second buckling part are arranged on the other side of the lower end of each table board unit. Each table board unit can be placed on the placing platforms of the two cross bars through the placing part and the first buckling part, or can be buckled on the buckling platform of any one cross bar through the first buckling part and the second buckling part; and when the table board unit is buckled on the buckling platform of any one cross bar, the first buckling part enters the groove part and is buckled on the first limiting convex strip, and the second buckling part is buckled on the second limiting convex strip.

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