CN115444210A - Table board supporting leg folding connection unit and portable folding table - Google Patents

Abstract

The invention aims to provide a table leg folding and connecting unit which can effectively resist external influence during unfolding use and has good bearing capacity, and a portable folding table. The table board support leg folding and connecting unit comprises a foldable support leg and a table board piece; the foldable supporting foot comprises a main supporting rod with a supporting function and an auxiliary connecting rod group with a limiting and fixing function on the main supporting rod, the auxiliary connecting rod group respectively comprises a first connecting section positioned on the lower side and a second connecting section positioned on the upper side when the supporting foot is in an unfolded state, the lower end part of the first connecting section is connected with the main supporting rod in a hinged mode to form a first hinged rotating part, the second connecting section is connected with the table plate piece in a hinged mode to form a second hinged rotating part, and a transition connecting part and a supporting and limiting structure are further formed between the first connecting section and the second connecting section.

Description

Table board supporting leg folding connection unit and portable folding table

Technical Field

The invention relates to the field of portable outdoor folding tables and chairs, in particular to a table board folding connecting unit and a portable folding table comprising the table board folding connecting unit.

Background

When camping in outdoor places, people usually carry foldable table and chair tools along with the vehicle so as to place various articles such as water cups, tableware and the like. Considering vehicle space size restriction, most portable folding tables all adopt the folding form, but the space utilization when folding placing has emphatically been considered in current folding table, but often can appear connection structure stable enough, easy emergence damage's drawback.

The folding table disclosed in the chinese invention patent document with the application number CN201710891192.3 comprises a pair of foldable table frames and table legs mounted on the table frames, wherein the two table frames are connected through a hinge assembly, the two table frames are respectively provided with a table plate, the two table plates rotate downwards in a single direction to be folded, and the table legs are rotatably mounted on the table frames and can rotate to the back of the table plates. This kind of folding table that gives in this scheme simple structure, support stable, be difficult for empting, can accomodate the table leg between the table after folding, reduced the volume of desk greatly, two table can be in the same place through the buckle joint after folding moreover, difficult separation, portable. However, the leg parts on both sides of the folding table in the scheme are easy to cause the difference of the abrasion degree between the leg parts and the table frame in the repeated folding and unfolding process, so that the positions of the two leg parts are deviated in different degrees, and the integral stability of the folding table in use is influenced.

As another example, a table convenient to store disclosed in chinese patent application No. CN201710999065.5 includes a table, a table frame, and table legs, and further includes a hinge assembly for supporting between the table and the table legs, the hinge assembly at least includes a first bracket, a second bracket, and a third bracket, the first bracket is fixedly installed below the table, one end of the second bracket is hinged to the first bracket, the other end is hinged to an end of the third bracket, and the other end of the third bracket is hinged to the table legs; the middle part of the lower plate surface of the table plate is provided with a supporting seat which is arranged along the width direction and used for supporting the table plate, and the two ends of the first support are rotatably arranged on the supporting seat, so that the table plate is supported on the table legs when the second support and the third support are in linear connection. The table that can realize folding function that gives in this scheme simple structure, convenient folding accomodate, support stably, bearing capacity are strong, will exert oneself through the table leg and transmit first support for support table middle part makes the table have better bearing capacity. By analyzing the technical scheme provided in the application document, it can be found that a corresponding supporting and limiting structure is not arranged between the second bracket and the third bracket which can generate relative rotation. That is, once the angle formed between the second bracket and the third bracket is formed due to shaking vibration or load deformation, the hinge assembly loses the reinforced supporting effect on the table plate part. When the table plate part, particularly the part close to the connecting position between the two table plates, is subjected to a larger pressing action force, the single-side table plate can rotate downwards relative to the position hinged with the table legs, and meanwhile, the whole table plate is sunken and collapsed, so that the folding table is damaged.

In view of the above problems, the present invention provides a table leg folding connection unit capable of effectively resisting external influence during unfolding use and having good load-bearing capacity, and a portable folding table comprising the table leg folding connection unit.

Disclosure of Invention

The invention provides a table leg folding connection unit which can effectively resist external influence during unfolding use and has good bearing capacity, and a portable folding table comprising the table leg folding connection unit.

The technical purpose of the invention is realized by the following technical scheme:

a table leg folding and connecting unit comprises a foldable supporting leg and a table plate fixedly arranged on the foldable supporting leg; the foldable supporting foot comprises a main supporting rod and an auxiliary connecting rod group, the main supporting rod is used for directly supporting the table plate piece, the auxiliary connecting rod group is used for limiting and fixing the main supporting rod in the unfolding state of the supporting foot, the auxiliary connecting rod group respectively comprises a first connecting section and a second connecting section, the first connecting section is located on the lower side of the supporting foot in the unfolding state of the supporting foot, the second connecting section is located on the upper side of the supporting foot, the lower end portion of the first connecting section is connected with the main supporting rod in a hinged mode to form a first hinged rotating portion, the upper end portion of the second connecting section is connected with the table plate piece in a hinged mode to form a second hinged rotating portion, the upper end portion of the first connecting section is connected with the lower end portion of the second connecting section in a hinged mode to form a transition connecting portion, and a supporting and limiting structure used for limiting the relative rotation angle between the two connecting sections is further formed between the first connecting section and the second connecting section.

Preferably, the supporting and limiting structure includes a supporting portion formed on an upper edge portion of an upper end of the first connecting section, and a limiting portion formed on a lower edge portion of a lower end of the second connecting section; the supporting and abutting part is provided with a supporting and abutting plane, and the limiting part is provided with a limiting plane which is used for abutting and abutting against the supporting and abutting plane.

Preferably, the main support rod includes a pair of rod members respectively arranged at left and right sides of the table member and a transverse link fixedly connected between the pair of rod members, the first hinge-rotation portion is located at a position near a middle portion of the transverse link, the first connecting section includes branch rod members respectively arranged at left and right sides of the second connecting section, and the two branch rod members are fixedly connected to each other to form a whole and can rotate around two central axes respectively located at two ends and extending in a horizontal direction.

Preferably, the lower portion of the branch rod pieces forms an outward-expanding extension portion which is bent and extended outwards along the horizontal direction, so that the branch rod pieces on two sides form a triangular structure when being connected with the transverse connecting rod at the same time.

Preferably, a frame connecting piece transitionally connected between the main supporting rod and the table piece is further arranged above the main supporting rod, the frame connecting piece is annular as a whole, one end of the frame connecting piece is connected with the upper end of the second connecting section, and the other end of the frame connecting piece is rotatably connected with the upper end of the main supporting rod; the second hinge turning portion is located inside the frame connecting member.

Preferably, when the support leg is in the expanded state in which the support portion and the stopper portion are in contact with each other, the main support rod is in an inclined state in which the lower support end is located further outward than the upper connection end.

Preferably, the second connecting section is movably provided with a limit clamping piece capable of performing reciprocating sliding motion along the axial direction of the second connecting section, and the limit clamping piece comprises a limit clamping part which is used for abutting against the lower part of the first connecting section.

Preferably, the limiting clamping piece is integrally in a hollow tubular shape, and a stepped retaining structure is formed inside the limiting clamping piece.

A portable folding table comprises a pair of table board support leg folding connection units, wherein the two groups of table board support leg folding connection units are respectively arranged at two sides and are mutually movably connected in a hinged mode

Preferably, a rotation center link is installed between the two sets of table leg folding connection units, the frame connection member and the auxiliary connection rod set in each set of the supporting folding connection units are connected to the rotation center link at the same time, so that the auxiliary connection rod can rotate around the central axis of the rotation center link, and the table leg folding connection unit on one side can rotate around the central axis of the rotation center link integrally relative to the other table leg folding connection unit.

In summary, the present invention can achieve the following beneficial effects:

1. the table board support leg folding connection unit provided by the invention comprises a folding support leg, the folding support leg comprises an auxiliary connection rod group which is used for fixing and limiting the table leg in an unfolding state of the folding table and can play an auxiliary supporting role, and a supporting and limiting structure formed in the auxiliary connection rod group can ensure that the whole auxiliary connection rod group formed by mutually hinging a first connection section and a second connection section is always kept in a straight state when the auxiliary connection rod group supports, so that the auxiliary connection rod group is prevented from being bent and failed due to shaking vibration or bearing deformation.

2. The supporting and limiting structure provided by the invention comprises a supporting part formed at the upper edge part of the upper end of the first connecting section and a limiting part formed at the lower edge part of the lower end of the second connecting section, and the supporting and limiting part and the limiting part are in plane abutting connection, so that the abutting connection effect between the two parts is more stable and reliable. In addition, the supporting action between the supporting part and the limiting part can limit the folding direction of the foldable support leg, and the situation that the first connecting section and the second connecting section are relatively reversely rotated and cannot be folded and stored relative to the table piece is avoided.

3. The table board support leg folding connection unit provided by the invention has the advantages that the branch rod pieces on the two sides respectively extend outwards simultaneously and then are connected and fixed on the transverse connecting rod connected between the support leg rod pieces so as to form a stable triangular structure, so that the acting force born by the table board piece can be uniformly distributed to the support leg rod pieces on the two sides, and the integral bearing strength and the durability of the folding table can be improved.

4. When the table board support leg folding connection unit is in an unfolding state that the supporting part and the limiting part are mutually abutted, the main supporting rod is in an inclined state that the lower supporting end is closer to the outer side relative to the upper connecting end; under this state, the holding foot that the object that table spare top was placed can order about the folding table both sides produces the trend that outwards expands, strengthens supporting the effect of holding between portion and the spacing portion, and then avoids the main supporting rod part of folding table to take place the condition emergence that inside upset leads to the folding table to topple in the use.

5. In the support leg folding and connecting unit provided by the invention, the second connecting section is also provided with a limiting clamping piece which can perform reciprocating sliding motion along the axial direction of the second connecting section. This spacing joint spare can be opened along with the outside upset of collapsible supporting foot, slides from top to bottom automatically under the effect of gravity until being connected with the first linkage segment block that is located the downside, makes this spacing joint spare joint simultaneously be fixed in on first linkage segment and the second linkage segment to fix two parts locking for a whole member. Effectively prevent that folding table from receiving unexpected external force collision and folding in the twinkling of an eye owing to main supporting rod under the expansion user state, the condition of damaging the article placed on the table appears. Simultaneously be formed with this the inside of spacing joint spare is formed with step shape stopping structure and can moves the back downwards at spacing joint spare, accomplishes automatically for the block effect of first linkage segment and second linkage segment, only receives under the effect of gravity, if the non-user adjusts the normal operation and resets, can all keep its along the axial location of supplementary connecting rod group at the long-time expansion use of folding table to the realization is to the reliable locking action of folding table expansion state.

Drawings

Fig. 1 is a schematic view of the overall structure of a table leg folding connection unit;

fig. 2 is a schematic view of a state of the table leg folding connection unit at a certain moment in the folding process;

FIG. 3 is a schematic view of the connection between the foldable support foot and the table member;

FIG. 4 is a partially enlarged view of the supporting and limiting structure;

FIG. 5 is an enlarged schematic view of a fitting structure between the limit clip and the auxiliary connecting rod set;

FIG. 6 is a schematic view of the overall structure of the portable folding table formed by the folding connection units of the table legs at two sides;

FIG. 7 is a schematic view of the portable folding table in an unfolded state;

fig. 8 is a schematic structural view of the portable folding table during folding.

In the figure:

a-table leg folding connection unit;

1-foldable support leg;

2-a table plate member;

3-rotating center connecting rod

4-main support bar, 401-transverse link;

5-auxiliary connecting rod set, 501-first connecting section, 502-second connecting section;

6-supporting and limiting structure, 601-supporting and limiting part, 602-limiting part;

7-branch rod member, 701-external expansion extension part;

8-frame connecting piece;

9-limiting clamping piece, 901-step retaining structure.

Detailed Description

The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.

The scheme is realized by the following technical means:

example 1: in the present embodiment, a table leg folding attachment unit a for assembling and installing to form a folding table is provided. The table leg folding and connecting unit A comprises two parts, namely a foldable supporting leg 1 positioned at the lower part and a table member 2 positioned at the upper part. The table member 2 is made of wood or hard plastic, and the foldable supporting leg 1 is made of hollow cylindrical metal pipe, and is bent, welded or riveted to form a frame structure.

When the foldable supporting leg 1 and the table piece 2 are connected, a conventional mode of coating adhesive on the contact surfaces of the two parts or punching holes on the table piece 2 and locking and fixing the holes by using bolt fasteners can be adopted, but in consideration of the characteristics that the material of the table piece 2 is light and the peripheral part is easy to damage under collision, in the scheme provided by the embodiment, a more special connecting structure is adopted between the table piece 2 and the foldable supporting leg 1. Specifically, the foldable supporting leg 1 comprises a U-shaped frame connecting piece 8 formed by bending a square pipe or a round pipe, and the frame connecting piece 8 is flatly arranged in a state that an opening faces to the central area of the foldable table to be assembled. The frame connecting member 8 has an open ring shape similar to a U shape, but may also have a completely closed ring shape or other structures capable of connecting with the outer circumferential portion of the table member 2, which will not be described herein.

When the table piece 2 is laid flat on the frame connecting frame, the outer peripheral surface of the table piece 2 does not protrude from the outer peripheral surface of the metal frame connecting piece 8. A plurality of installing openings have been seted up from top to bottom on frame attach spare 8, encircle the lower surface of table plate spare 2 lean on the outside part be formed with a plurality of downward archs, with the corresponding connection installation department of installing opening size shape, when making table plate spare 2 place in frame attach spare 8 top, the connection installation department can imbed among the installing opening. Furthermore, a through hole is formed on the inner side surface of each mounting opening position on the frame connecting piece 8, and a mounting threaded hole corresponding to the through hole is formed on the connecting mounting part. After the connecting and installing part is embedded into the installing opening, a fastening bolt is fastened in the installing threaded hole after penetrating through the through hole, so that the connecting and fixing between the table plate part 2 and the frame connecting piece 8 can be realized, namely, the table plate part 2 and the foldable supporting foot 1 are connected and fixed into a whole.

The folding supporting leg 1 as the main supporting function and folding function component in the table leg folding connecting unit a comprises two parts of a main supporting rod 4 for directly supporting the table piece 2 and an auxiliary connecting rod group 5 for limiting and fixing the main supporting rod 4 in the unfolded state of the supporting leg.

Specifically, the main support rod 4 includes a pair of rod members respectively arranged at the left and right sides of the table plate member 2 and a cross link 401 fixedly connected between the pair of rod members, and is integrally formed in an H-shaped structure. The rod pieces on both sides of the main supporting rod 4 are positioned inside the frame connecting piece 8, and the upper end parts of the two rod pieces are connected with the frame connecting piece 8 in a hinged mode, so that the main supporting rod 4 as a whole can rotate around the common central axis of the hinged parts on both sides relative to the frame connecting piece 8, and the foldable supporting foot 1 can be switched between the two states of folding, storing and unfolding for use.

The auxiliary connecting rod set 5 further includes a first connecting section 501 located at the lower side and a second connecting section 502 located at the upper side when the supporting leg is in the unfolded state, the lower end of the first connecting section 501 is connected with the main supporting rod 4 in a hinged manner to form a first hinged rotating portion, the upper end of the second connecting section 502 is connected with the table plate 2 in a hinged manner to form a second hinged rotating portion, and the upper end of the first connecting section 501 is connected with the lower end of the second connecting section 502 in a hinged manner to form a transition connecting portion. Specifically, the auxiliary connecting rod group 5 is integrally located at the middle position of the table plate member 2 along the horizontal direction, so that the first rotary connecting part is located at the middle position where the distance between the transverse connecting rod 401 and the two ends of the transverse connecting rod is equal; likewise, the second swivel connection is also provided at equally spaced positions relative to the ends of the frame connection 8. It should also be noted here that the hinge connection between the main support rod 4 and the auxiliary link set 5 and the frame link 8 is located inside the frame link 8, so as to avoid the fragile hinge connections from protruding outwards relative to the frame link 8, and to minimize the risk of damage to the hinge connections during stacking or transportation.

A supporting and limiting structure 6 for limiting the relative rotation angle between the two connecting sections is further formed between the first connecting section 501 and the second connecting section 502. The supporting and limiting structure 6 includes a supporting portion 601 formed on the upper edge portion of the upper end of the first connecting section 501 and a limiting portion 602 formed on the lower edge portion of the lower end of the second connecting section 502. Specifically, the limiting portion 602 may be a sheet-shaped structure formed by protruding and extending the lower edge portion of the rod-shaped second connecting section 502 to both sides, and forms a limiting plane located on the lower side of the sheet-shaped abutting portion 601. Correspondingly, the upper surface of the supporting portion 601 formed at the upper edge of the first connecting section 501 is also in a plane shape, and forms a supporting plane corresponding to the limiting plane. When the foldable supporting foot 1 is gradually opened, the first connecting section 501 and the second connecting section 502 rotate around the hinge center of the transitional connecting part until the lower surface of the limiting part 602 contacts and fits with the upper surface of the supporting part 601. At this time, the first connecting section 501 and the second connecting section 502 are movably connected and cannot move continuously along the rotating direction, that is, the auxiliary connecting rod set 5 is approximately a whole rod. In this state, a triangle-like structure is formed by the table plate member 2, the main support rod 4 and the auxiliary connecting rod group 5 being connected to each other as viewed from the side. This configuration provides a greater load bearing capacity for the table element 2 located above.

During the folding and storage of the foldable support foot 1, the main support rod 4 needs to rotate reversely and approach the tabletop 2. In this process, the transition connection portion is substantially free to move upward or downward without the restriction of the abutment limiting structure 6. While the shape of the recessed area portion formed on the lower surface of the table member 2 should preferably correspond to the state where all the bar members are located inside the frame connecting member 8, it is obvious that the auxiliary connecting bar group 5 cannot enter the predetermined recessed area.

Therefore, the supporting and limiting structure 6 not only can provide support for the first connecting section 501 and the second connecting section 502 to be connected into a whole in the unfolded state of the foldable supporting foot 1, but also can control the relative rotation direction between the first connecting section and the second connecting section 502, thereby ensuring that the folding table works in a stable and reliable state.

Considering the stability and reliability of the connection between the auxiliary connecting rod group 5 and the main supporting rod 4, and the load-bearing forces on both sides thereof are more balanced to avoid the bending deformation of the rod, the structure of the second connecting section 502 in the auxiliary connecting rod group 5 is optimized, and the second connecting section is disassembled into a pair of branch rods 7 respectively arranged on the left and right sides of the lower end of the line segment of the first connecting section 501, and the two branch rods 7 are fixedly connected with each other to form a whole with both ends respectively hinged to the lower end of the first connecting section 501 and the transverse connecting rod 401, and the whole can rotate around two central axes horizontally extending at both ends along with the folding or unfolding process of the foldable supporting foot 1.

In order to make the downward acting force borne by the auxiliary connecting rod group 5 more uniformly distributed and transmitted to the rod pieces on both sides in the main supporting rod 4 through the transverse connecting rod 401, the shape and structure of the branch rod pieces 7 are further optimized and improved, the lower sections of the branch rod pieces 7 on both sides are also respectively provided with outward-expanding extension parts 701 which are bent and extended outwards along the horizontal direction, and a triangular structure is formed when the branch rod pieces 7 on both sides are simultaneously connected with the transverse connecting rod 401, so that the structural reliability of the foldable supporting foot 1 in the unfolded state is improved.

Considering that the foldable supporting leg 1 is in an unfolded state as a whole and is used for supporting, if the main supporting rod 4 is in a vertical state, when the outer side of the main supporting rod 4 is subjected to a light collision, the main supporting rod 4 on the side is also likely to be rotated and folded inwards, and further the foldable table is likely to overturn as a whole and objects placed above the foldable table are dropped and damaged. Therefore, as a preference, when the lengths and the relative positional relationships of the auxiliary connecting rod group 5 and the main supporting rod 4 are designed cooperatively, it should be noted that the structural relationship is properly selected so as to realize the inclined state of the main supporting rod 4 with the lower supporting end being more outside relative to the upper connecting end when the supporting legs are in the unfolded state where the supporting portions 601 and the limiting portions 602 abut against each other. Under this state, the object placed on the table board member 2 can be converted into the pushing action force generated by the table board member 2 to continuously drive the main supporting rod 4 to rotate towards the outside, so as to ensure the tight fit state between the supporting part 601 and the limiting part 602 in the supporting and limiting structure 6, and thus the stability of the whole folding table product in the unfolding use process is improved.

Although the outward-inclined structure of the main supporting rod 4 can ensure the stable and reliable structure of the portable folding table in the using state to a certain extent, the foldable supporting foot 1 is still easy to fold and overturn when being locally subjected to a large impact force in the moment. Therefore, the structure of the folding table product is further optimized, and a limit clamping piece 9 can be movably arranged on the auxiliary connecting rod group 5. The whole limiting clamping piece 9 is in a hollow cylindrical tubular shape, the inner radial dimension of the hollow cylindrical tubular shape is slightly larger than that of the second connecting section 502, and meanwhile, a part which is used for being abutted to the first connecting section 501 and the second connecting section 502 simultaneously is formed inside the limiting clamping piece 9. After the limiting clamping piece 9 is sleeved on the second connecting section 502, the limiting clamping piece 9 can move back and forth along the axial direction of the second connecting section 502. Under this structure, along with the unfolding action of the foldable supporting leg 1, the first connecting section 501 and the second connecting section 502 are connected in an extending manner to form a straight rod shape, and at this time, the limiting clamping piece 9 automatically slides down from top to bottom under the action of gravity until the lower end part of the limiting clamping piece abuts against the outward extending part 701 on the branch rod member 7. Under the condition that the limiting clamping piece 9 is not moved upwards again and reset, the first connecting section 501 and the second connecting section 502 cannot rotate relatively and fold under the effect of the sleeve joint and the stopping effect of the limiting clamping piece 9, and therefore the table leg connecting unit and the portable folding table comprising the table leg connecting unit are stable in the unfolding using state.

Furthermore, in order to prevent the first connecting section 501 and the second connecting section 502 from being locked by the limiting clamping piece 9, the limiting clamping piece 9 may be provided with a stepped retaining structure 901 inside. Specifically, the structure is arranged inside the limit clamping piece 9 and is a closing section which is smaller than the radial size of the hollow main body section. Meanwhile, the radial dimension of the second connecting section 502 is slightly larger than that of the first connecting section 501. In the process of sliding down the limiting clamping piece 9, the inner wall surface of the closing section close to the upper portion slides over the surface of the second connecting section 502 until falling off to the first connecting section 501. At this time, the end surface of the inner side of the closing section and the end surface of the side of the second connecting section 502 generate a resisting effect, so that the connection failure of the first connecting section 501 and the second connecting section 502 caused by the movement of the limiting clamping piece 9 is further avoided, and the structure of the portable folding table is strengthened.

Example 2: in this embodiment, further to the embodiment 1, an embodiment of forming a portable folding table by using two table leg folding connection units a for docking is given. Specifically, in the portable folding table, two sets of table leg folding connection units a are respectively arranged at two sides and are movably connected with each other in a hinged manner. For the table leg folding and connecting unit a on one side, taking the foldable supporting leg 1 using the U-shaped frame connecting member 8 as an example, a turning center connecting rod 3 is transversely connected between two ends of the opening side of the frame connecting member 8, and the upper end of the second connecting section 502 is movably connected to the middle position of the turning center connecting rod 3 in a hinged manner. The folding and connecting unit a of the table leg at the other side has the same structure as the folding and connecting unit a of the table leg at the other side, but the folding and connecting unit a of the table leg at the side is not provided with the rotation center connecting rod 3 independently, but shares the same rotation center connecting rod 3 with the folding and connecting unit a of the table leg at the opposite side. At this time, the frame connecting member 8 and the auxiliary connecting rod group 5 in each group of the supporting folding connecting units are simultaneously connected to the upper surface of the rotation center connecting rod 3, so that the auxiliary connecting rod can rotate around the central axis of the rotation center connecting rod 3, and the table leg folding connecting unit a on one side can integrally rotate around the central axis of the rotation center connecting rod 3 relative to the other table leg folding connecting unit a, so that the table leg folding connecting units a on the two sides are mutually folded into a block after the foldable supporting legs 1 on the two sides are folded and stored in sequence.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A table stabilizer blade folding joint unit which characterized in that: comprises a foldable supporting foot (1) and a table plate component (2) fixedly arranged on the foldable supporting foot (1); the foldable supporting foot (1) comprises a main supporting rod (4) used for directly supporting the table plate piece (2) and an auxiliary connecting rod group (5) used for limiting and fixing the main supporting rod (4) in an unfolded state of the supporting foot, the auxiliary connecting rod group (5) further comprises a first connecting section (501) located on the lower side and a second connecting section (502) located on the upper side when the supporting foot is in the unfolded state, the lower end of the first connecting section (501) is connected with the main supporting rod (4) in a hinged mode to form a first hinged rotating portion, the upper end of the second connecting section (502) is connected with the table plate piece (2) in a hinged mode to form a second hinged rotating portion, a transition connecting portion is also connected between the upper end of the first connecting section (501) and the lower end of the second connecting section (502) in a hinged mode, and a limiting structure (6) used for limiting the rotation angle of the two connecting sections is further formed between the first connecting section (501) and the second connecting section (502).

2. A table leg folding connection unit as claimed in claim 1, wherein: the supporting and limiting structure (6) comprises a supporting part (601) formed at the upper edge part of the upper end of the first connecting section (501) and a limiting part (602) formed at the lower edge part of the lower end of the second connecting section (502); the supporting and abutting part (601) is provided with a supporting and abutting plane, and the limiting part (602) is provided with a limiting plane which is abutted and jointed with the supporting and abutting plane.

3. A table leg folding connection unit as claimed in claim 2, wherein: main supporting rod (4) include divide list in a pair of member and the transverse connection pole (401) of fixed connection between this a pair of member of table board spare (2) left and right sides, first articulated turning portion is located transverse connection pole (401) near middle position department, include in first linkage section (501) respectively set up in branch member (7) of second linkage section (502) left and right sides, two branch member (7) interconnect fixed formation a whole and can encircle and are located two central axis that the both ends extend along the horizontal direction respectively and rotate.

4. A table leg folding connection unit as claimed in claim 3, wherein: and an outward-expanding extension part (701) which is bent and extended outwards along the horizontal direction is formed at the lower part of the branch rod pieces (7), so that a triangular structure is formed when the branch rod pieces (7) at two sides are connected with the transverse connecting rod (401) at the same time.

5. The table leg folding joint unit as set forth in claim 3 or 4, wherein: a frame connecting piece (8) transitionally connected between the main supporting rod (4) and the table piece (2) is further arranged above the main supporting rod (4), the frame connecting piece (8) is annular in whole, one end of the frame connecting piece (8) is connected with the upper end of the second connecting section (502), and the other end of the frame connecting piece (8) is rotatably connected with the upper end of the main supporting rod (4); the second articulated turn is located inside the frame connection (8).

6. The folding connection unit for table legs as set forth in claim 5, wherein: when the supporting leg is in an unfolded state that the supporting part (601) and the limiting part (602) are mutually abutted, the main supporting rod (4) is in an inclined state that the lower supporting end is more outward relative to the upper connecting end.

7. A table leg folding connection unit as claimed in claim 6, characterized in that: the second connecting section (502) is movably provided with a limiting clamping piece (9) capable of performing reciprocating sliding motion along the axial direction of the second connecting section (502), and the limiting clamping piece (9) is provided with a limiting clamping portion used for being abutted to the lower portion of the first connecting section (501).

8. A table leg folding connection unit as claimed in claim 7, wherein: the limiting clamping piece (9) is integrally in a hollow tubular shape, and a step-shaped retaining structure (901) is formed inside the limiting clamping piece (9).

9. A portable folding table is characterized in that: comprising a pair of folding table leg joint units (A) as claimed in claim 7, two of said folding table leg joint units (A) being arranged on both sides and being hingedly connected to each other.

10. The portable folding table according to claim 9, wherein: a rotary center connecting rod (3) is arranged between the two groups of table leg folding connecting units (A), the frame connecting piece (8) and the auxiliary connecting rod group (5) in each group of supporting folding connecting units are simultaneously connected to the upper surface of the rotary center connecting rod (3), the auxiliary connecting rod can rotate around the central axis of the rotation center connecting rod (3), and the table leg folding and connecting unit (A) on one side can integrally rotate around the central axis of the rotation center connecting rod (3) relative to the other table leg folding and connecting unit (A).

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