WO2024152400A1 - Folding chair structure convenient to fold - Google Patents

Abstract

A folding chair structure convenient to fold, aiming to overcome the defect that folding chairs are inconvenient to fold. The folding chair comprises an upper connecting base (1) and a lower connecting base (2); at least three groups of folding frames are connected between the upper connecting base (1) and the lower connecting base (2); each folding frame comprises a support rod (3) and a foot rod (4) which are hingedly connected together to form an X-shaped structure; the lower end of the support rod (3) is hingedly connected to the lower connecting base (2); the upper end of the foot rod (4) is hingedly connected to the upper connecting base (1); the upper end of the support rod (3) extends upwards to form a seat cloth connecting end; and the lower end of the foot rod (4) extends downwards to form a support foot end.

Description

A folding chair structure that is easy to fold Technical Field

The invention relates to a folding chair, and more particularly to a folding chair structure which is convenient for folding.

Background technique

At present, folding chairs are widely recognized in the market because they can be folded and stored and are easy to carry. Folding chairs mainly include leg tubes, seat cloth support tubes, and seat cloth installed on the seat cloth support tubes. The leg tubes are connected to the seat cloth support tubes. Before using the folding chair, the leg tubes and the seat cloth support tubes need to be plugged in and out, which is cumbersome to use and inconvenient to fold.

Summary of the invention

In order to overcome the above-mentioned shortcomings, the present invention provides a foldable chair structure that is easy to fold. The foldable chair is easy to fold and easy to use.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a folding chair structure that is easy to fold, including an upper connecting seat and a lower connecting seat, at least three sets of folding frames are connected between the upper connecting seat and the lower connecting seat, the folding frame includes a support rod and a foot rod hinged together in an X-shaped structure, the lower end of the support rod is hinged to the lower connecting seat, the upper end of the foot rod is hinged to the upper connecting seat, the upper end of the support rod extends upward to form a seat cloth connecting end, and the lower end of the foot rod extends downward to form a supporting foot end.

When the folding chair is unfolded for use, the upper connecting seat and the lower connecting seat are close to each other and supported together, the support rod and the foot rod are unfolded outward, the supporting foot end at the lower end of the foot rod is supported on the ground, and the seat cloth is connected to the seat cloth connecting end on the support rod. At this time, the folding chair can be used. During the folding operation, the entire folding chair can be folded up by rotating any one of the support rods or any one of the foot rods inward. During the folding process, the upper connecting seat and the lower connecting seat move away from each other, and the hinged positions of the support rod and the foot rod move closer to the middle, so that the entire folding chair is gathered and folded toward the middle. Similarly, when the folded folding chair is unfolded outward for use, the entire folding chair can be unfolded by rotating any one of the support rods or any one of the foot rods outward, which is easy to operate. The folding chair of the present application is convenient to fold and use.

Preferably, the upper connecting seat is connected to a guide column, the lower connecting seat is provided with a guide hole corresponding to the guide column, and the guide column is movably connected to the guide hole.

During the folding and unfolding process of the folding chair, the upper connecting seat and the lower connecting seat move relative to each other. The guide post moves along the guide hole to ensure the smooth unfolding and folding of the folding chair. During the use of the folding chair, the guide post is plugged and connected with the guide hole to realize the positioning of the upper connecting seat and the lower connecting seat, prevent the upper connecting seat and the lower connecting seat from deviating, and ensure the stability of the entire folding chair structure.

Preferably, the support rod and the foot rod are both provided with reinforcement sleeves, and the reinforcement sleeves on the support rod and the foot rod are rotatably connected together to realize the hinge connection of the support rod and the foot rod.

The provision of the reinforcement sleeve improves the structural strength of the connection position between the support rod and the foot rod.

Preferably, two upper hinged ears are provided on the upper connecting seat and the connecting position of the foot rod, and the upper end of the foot rod is hinged between the two upper hinged ears; two lower hinged ears are provided on the lower connecting seat and the connecting position of the support rod, and the lower end of the support rod is hinged between the two lower hinged ears.

The provision of the upper hinged ear facilitates the connection between the foot rod and the upper connecting seat, and the provision of the lower hinged ear facilitates the connection between the support rod and the lower connecting seat.

Preferably, the lower end of the foot rod is connected to a support, which can increase the stability of the foot rod support.

Preferably, the support includes a connecting sleeve and a supporting body, wherein the connecting sleeve is connected to the lower end of the foot rod, a universal ball head is provided at the lower end of the connecting sleeve, a connecting groove adapted to the universal ball head is provided on the supporting body, and the universal ball head is rotatably installed in the connecting groove. An annular limiting plate is installed at the open end of the connecting groove on the supporting body, the inner diameter of the limiting plate is smaller than the diameter of the universal ball head, and the limiting plate is connected to the movable sleeve of the universal ball head.

When the folding chair is used on an uneven ground, the support body and the connecting sleeve can be universally rotated to adjust the angle so as to adapt to the uneven ground and ensure the stability of the support of the entire folding chair.

Preferably, the foot rod includes a connecting section, an inclined section, and a bent section which are arranged in sequence from top to bottom. The inclined section is inclined outward from top to bottom, the bent section is bent downward, and the angle between the bent section and the inclined section is an obtuse angle.

This structural arrangement can increase the outward expansion range of the foot rod, thereby increasing the support range of the foot rod and improving the stability of the entire folding chair.

Preferably, the support rods of one part of the folding frame are front support rods, and the support rods of the other part of the folding frame are rear support rods, the upper ends of the rear support rods are connected to the extension rods, and the upper ends of the extension rods are higher than the upper ends of the front support rods.

The rear support rod is connected with an extension rod as a backrest support part of the folding chair, so that the folding chair has a height difference between the front and the back, thereby improving the comfort of the seat.

Preferably, the extension rod is detachably connected to the rear support rod; a card seat is connected to the upper connecting seat, or a card seat is connected to the lower connecting seat, or both the upper connecting seat and the lower connecting seat are connected to card seats; the card seat is provided with a card slot adapted to the extension rod, and the extension rod is clamped in the card slot on the card seat after being folded.

After folding, the extension rod is disassembled and clamped on the card seat, which can shorten the length of the entire folded chair, thereby reducing the packaging volume, facilitating carrying and transportation, and reducing transportation costs.

Preferably, anti-scratch caps are installed on the upper ends of the extension rod and the front support rod.

The anti-scratch cap can protect the seat fabric and prevent it from being scratched.

Preferably, the support rod comprises a lower rod and an upper rod, the angle between the lower rod and the upper rod is an obtuse angle, and the angle between the lower rod and the upper rod of the front support rod is greater than the angle between the lower rod and the upper rod of the rear support rod.

This structural arrangement increases the comfort of the backrest after the seat fabric is installed.

Preferably, a height adjustment mechanism is installed on the lower connecting seat, and the height adjustment mechanism includes an adjusting seat, a connecting rod, a limiting pawl, and a pushing pawl. A plurality of ratchets arranged at intervals up and down are provided on the outer wall of the guide column. A positioning pin is installed on the lower connecting seat. One end of the adjusting seat is hinged on the lower connecting seat, and the other end of the adjusting seat is limited between the lower connecting seat and the positioning pin. An ejection spring is installed between the adjusting seat and the lower connecting seat; the connecting rod is hinged on the adjusting seat, and the pushing pawl is hinged on one end of the connecting rod; the limiting pawl is hinged on the adjusting seat, and the ends of the limiting pawl and the pushing pawl are placed between two adjacent ratchets; the connecting rod rotates to cause the pushing pawl to rotate upward and thereby push the guide column to move upward.

After the folding chair is unfolded and used, when the height needs to be adjusted, the adjustment seat is rotated inward to adjust it in place, and the adjustment seat can be pushed to operate by the connecting rod. The adjustment seat is limited between the lower connecting seat and the positioning pin. At this time, the end of the limit pawl and the push-up pawl are both placed between two adjacent ratchets. Then the connecting rod is rotated, and the push-up pawl rises upward with the end of the connecting rod. The end of the push-up pawl is placed between two adjacent ratchets, thereby pushing the guide column upward. After the guide column is lifted up a certain distance, the end of the limit pawl is placed between two adjacent ratchets to limit the guide column and prevent the guide column from moving downward. Then the connecting rod rotates back in the opposite direction to perform the next lifting action until the height of the folding chair is adjusted in place to meet the use needs of different users and make people more comfortable sitting on the folding chair. During the folding process of the folding chair, the upper connecting seat and the lower connecting seat move away from each other, and the guide column moves upward relative to the lower connecting seat. At this time, the limit pawl and the push-up pawl will not hinder the ratchet. After folding, the guide column cannot move in the opposite direction under the action of the limit pawl and the push-up pawl. In other words, after the folding chair is folded, it will not automatically unfold, which plays a positioning role, and it is no longer necessary to tie the folded folding chair with a strap to position it. When unfolding and using it next time, first move the positioning pin so that the positioning pin loses its constraint on the adjustment seat. Under the action of the ejection spring, the adjustment seat rotates outward, and the limit pawl and the push-up pawl separate from the ratchet, losing the constraint on the guide column. At this time, the folding chair can be easily unfolded and used.

As a preferred embodiment, the lower connecting seat is provided with connecting holes corresponding to the positioning pins, and the edge of the connecting hole on the lower connecting seat is provided with A mounting sleeve is provided, a boss is arranged on the positioning pin, the positioning pin is adapted and connected with the connecting hole, the boss is supported on a lower connecting seat at the bottom of the mounting sleeve, the positioning pin extends upward out of the mounting sleeve, the boss abuts against a reset spring, and the reset spring abuts against the mounting sleeve.

Under the action of the reset spring, the positioning pin extends downward from the connection hole and abuts against the side wall of the adjustment seat. Pull the positioning pin upward to separate the lower part of the positioning pin from the side wall of the adjustment seat, so that the adjustment seat can be ejected outward. After ejection, release the positioning pin, and the end of the positioning pin abuts against the upper end surface of the adjustment seat. When the adjustment seat is pushed inward into place, the positioning pin is pushed downward again under the action of the reset spring and abuts against the side wall of the adjustment seat to limit the adjustment seat.

Preferably, mounting grooves are correspondingly arranged on the lower connecting seat and the adjusting seat, the adjusting seat is installed in the mounting groove, the lower end of the adjusting seat is hinged to the lower end of the mounting groove, a positioning platform is provided on the upper part of the mounting groove, the ejection spring is installed on the positioning platform, and the upper part of the adjusting seat is placed between the positioning platform and the positioning pin.

The positioning table plays a good role in positioning the adjustment seat.

Preferably, a positioning protrusion is provided on the upper side wall of the installation groove, and a limiting protrusion is provided correspondingly to the upper end of the adjustment seat and the positioning protrusion, and a moving distance is provided between the limiting protrusion and the positioning protrusion.

The arrangement of the positioning protrusion and the limiting protrusion limits the moving range of the adjustment seat and prevents the adjustment seat from being separated from the installation groove.

Preferably, positioning posts are installed on both upper and lower sides of the connecting rod on the adjustment seat, and the connecting rod rotates within the range between the two positioning posts.

The connecting rod rotates within a certain angle range for easy operation. After the inner end of the connecting rod rotates downward to the limit position, the end of the pawl is pushed up and separated from the ratchet to avoid obstruction to the guide column during the movement of the guide column in the guide hole.

Preferably, abutment columns are provided on the adjustment seat and on the limiting pawl correspondingly, an abutment spring is installed between the limiting pawl and the adjustment seat, and the limiting pawl abuts on the abutment column.

The end of the limiting pawl is placed between two adjacent ratchet teeth, so that the guide column can only move upwards but not downwards.

Preferably, the end of the connecting rod and the push-up pawl are correspondingly provided with a limit column, a limit spring is installed between the push-up pawl and the connecting rod, and the push-up pawl abuts against the upper limit of the limit column.

When the connecting rod rotates, the lifting pawl rises with the end of the connecting rod, and the end of the lifting pawl is placed between two adjacent ratchet teeth, thereby lifting the guide column upward. After the guide column is lifted up a certain distance, the end of the limiting pawl is placed between two adjacent ratchet teeth to limit the guide column and prevent it from moving downward. Then the connecting rod rotates back to its original position for the next lifting action.

Compared with the prior art, the present invention has the following beneficial effects: (1) the folding chair of the present application is easy to fold and fold; (1) The folding chair is easy to use; (2) When the folding chair is unfolded and used, the structural strength is good and the support is stable and reliable; (3) The folding chair can be adjusted in height to meet the needs of different users, making it more comfortable for people to sit on the folding chair.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of a folding chair of the present invention in use;

FIG2 is a schematic diagram of the unfolding process of the folding chair of the present invention;

FIG3 is a schematic diagram of a folding chair of the present invention when it is fully unfolded;

FIG4 is a schematic diagram of the folding chair of the present invention after being folded;

FIG5 is a schematic diagram of a support connection structure of Example 2 of the present invention;

6 is a schematic structural diagram of a height adjustment mechanism of Embodiment 2 of the present invention;

In the figure: 1, upper connecting seat, 2, lower connecting seat, 3, support rod, 4, foot rod, 5, support, 6, guide column, 7, guide hole, 8, reinforcement sleeve, 9, connecting pin, 10, upper hinge ear, 11, upper hinge axis, 12, lower hinge ear, 13, lower hinge axis, 14, connecting section, 15, inclined section, 16, bending section, 17, front support rod, 18, rear support rod, 19, extension rod, 20, card seat, 21, card slot, 22, anti-scratch cap, 23, lower section rod, 24, upper section rod, 25, seat cloth, 26, handle, 27, connecting sleeve, 28 , support body, 29, universal ball head, 30, connecting groove, 31, limit plate, 32, adjustment seat, 33, connecting rod, 34, limit pawl, 35, push-up pawl, 36, ratchet, 37, positioning pin, 38, ejection spring, 39, connecting hole, 40, mounting sleeve, 41, boss, 42, return spring, 43, end cover, 44, mounting groove, 45, positioning platform, 46, in-place protrusion, 47, limit convex block, 48, positioning column, 49, holding ball handle, 50, abutment column, 51, abutment spring, 52, limit column, 53, limit spring.

Detailed ways

The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

Embodiment 1: A foldable chair structure that is easy to fold (see Figures 1 to 4), comprising an upper connecting seat 1 and a lower connecting seat 2, the upper connecting seat and the lower connecting seat correspond to each other, and at least three sets of folding frames are connected between the upper connecting seat and the lower connecting seat. In this embodiment, four sets of folding frames are provided, and the two sets of folding frames on the left and the two sets of folding frames on the right are symmetrically arranged. The folding frame comprises a support rod 3 and a foot rod 4 that are hinged together in an X-shaped structure. The support rod The support rod and the foot rod are both tubular structures, the lower end of the support rod is hinged on the lower connection seat, the upper end of the foot rod is hinged on the upper connection seat, the upper end of the support rod extends upward to form a seat cloth connection end, and the lower end of the foot rod extends downward to form a foot support end. The lower end of the foot rod is connected to a support 5, and a socket is provided on the support, and the lower end of the foot rod is inserted into the socket.

The upper connecting seat is connected with a guide post 6, and the lower connecting seat is provided with a guide hole 7 corresponding to the guide post, and the guide post and the guide hole are movably connected. The cross sections of the guide post and the guide hole are both square.

The support rod and the foot rod are both provided with a reinforcing sleeve 8, and the reinforcing sleeves on the support rod and the foot rod are connected together by a connecting pin 9 to realize the articulation of the support rod and the foot rod, and the connecting pin runs through the support rod and the foot rod. Two upper hinged ears 10 are provided on the upper connecting seat and the foot rod connection position, and the upper end of the foot rod is hinged between the two upper hinged ears; an upper hinge shaft 11 is connected between the two upper hinged ears, and the upper hinge shaft movably passes through the upper end of the foot rod to realize articulation. Two lower hinged ears 12 are provided on the lower connecting seat and the support rod connection position, and the lower end of the support rod is hinged between the two lower hinged ears. A lower hinge shaft 13 is connected between the two lower hinged ears, and the lower hinge shaft movably passes through the lower end of the support rod to realize articulation.

The foot rod includes a connecting section 14, an inclined section 15, and a bending section 16 which are arranged in sequence from top to bottom. The inclined section is inclined outward from top to bottom, and the bending section is bent downward. The angle between the bending section and the inclined section is an obtuse angle. The reinforcing sleeve is connected to the connecting section, and the upper end of the connecting section is connected to the upper connecting seat. The support rod of one part of the folding frame is a front support rod 17, and the support rod of the other part of the folding frame is a rear support rod 18. In this embodiment, the support rods of the first two folding frames are the front support rods, and the support rods of the rear two folding frames are the rear support rods. The upper end of the rear support rod is connected to an extension rod 19, and the upper end of the extension rod is higher than the upper end of the front support rod. The extension rod is detachably connected to the rear support rod; a card holder 20 is connected to the upper connecting seat, or a card holder is connected to the lower connecting seat, or both the upper connecting seat and the lower connecting seat are connected to card holders; in this embodiment, both card holders are installed on the lower connecting seat. The card holder is provided with a card slot 21 adapted to the extension rod, and the extension rod is folded and stuck in the card slot on the card holder. The upper end of the extension rod and the upper end of the front support rod are both installed with an anti-scratch cap 22. The support rod includes a lower section rod 23 and an upper section rod 24, and the angle between the lower section rod and the upper section rod is an obtuse angle. The angle between the lower section rod and the upper section rod of the front support rod is greater than the angle between the lower section rod and the upper section rod of the rear support rod. The reinforcement sleeve is connected to the lower section rod.

When the folding chair is unfolded for use, the upper connecting seat and the lower connecting seat are close to each other and supported together, the support rods and the foot rods are unfolded outward, the supporting foot ends at the lower ends of the foot rods are supported on the ground, and the seat cloth 25 is connected to the seat cloth connecting end on the support rods. At this time, the folding chair can be used. During the folding operation, the entire folding chair can be folded up by turning any one of the support rods or any one of the foot rods inward. During the folding process, the upper connecting seat and the lower connecting seat move away from each other, and the hinged positions of the support rods and the foot rods move closer to the middle, thereby gathering and folding the entire folding chair towards the middle. Similarly, when the folded folding chair is unfolded for use, just turn any one of the support rods or the foot rods inward to fold it. The entire folding chair can be unfolded by rotating the support rod or any one of the foot rods outward, which is easy to operate. The folding chair of the present application is easy to operate and use.

Embodiment 2: A folding chair structure that is easy to fold (see Figures 5 and 6). Its structure is similar to that of Embodiment 1, with the main difference being that the support in this embodiment includes a connecting sleeve 27 and a support body 28. The connecting sleeve is connected to the lower end of the foot rod. A universal ball head 29 is provided at the lower end of the connecting sleeve. A connecting groove 30 adapted to the universal ball head is provided on the support body, and the universal ball head is rotatably installed in the connecting groove. An annular limit plate 31 is installed at the open end of the connecting groove on the support body. The inner diameter of the limit plate is smaller than the diameter of the universal ball head. The limit plate is connected to the movable set of the universal ball head. When the folding chair is used on an uneven ground, the support body and the connecting sleeve can be universally rotated to adjust the angle to adapt to the uneven ground, thereby ensuring the stability of the entire folding chair support.

A height adjustment mechanism is installed on the lower connecting seat, which includes an adjusting seat 32, a connecting rod 33, a limiting pawl 34, and a pushing pawl 35. A plurality of ratchets 36 arranged at intervals from top to bottom are provided on the outer wall of the guide column. A positioning pin 37 is installed on the lower connecting seat. One end of the adjusting seat is hinged on the lower connecting seat, and the other end of the adjusting seat is limited between the lower connecting seat and the positioning pin. An ejection spring 38 is installed between the adjusting seat and the lower connecting seat; the connecting rod is hinged on the adjusting seat, and the pushing pawl is hinged on one end of the connecting rod, and the other end of the connecting rod extends out of the lower connecting seat; the limiting pawl is hinged on the adjusting seat, and the ends of the limiting pawl and the pushing pawl are placed between two adjacent ratchets; the connecting rod rotates to cause the pushing pawl to rotate upward and thereby push the guide column to move upward.

The lower connection seat and the positioning pin are provided with connection holes 39 correspondingly, the edge of the connection hole on the lower connection seat is provided with a mounting sleeve 40, the positioning pin is provided with a boss 41, the positioning pin is adapted to be connected with the connection hole, the boss is supported on the lower connection seat at the bottom of the mounting sleeve, the positioning pin extends upward out of the mounting sleeve, the boss abuts against the reset spring 42, and the reset spring abuts against the mounting sleeve. The upper end of the mounting sleeve is connected to the end cover 43, and the reset spring abuts against the end cover. The upper end of the positioning pin is connected to the handle 26.

The lower connecting seat and the adjusting seat are provided with mounting grooves 44 correspondingly, the adjusting seat is installed in the mounting groove, the lower end of the adjusting seat is hinged at the lower end of the mounting groove, a positioning platform 45 is provided on the upper part of the mounting groove, the ejection spring is installed on the positioning platform, and the upper part of the adjusting seat is placed between the positioning platform and the positioning pin.

A positioning protrusion 46 is provided on the upper side wall of the installation groove, and a limiting protrusion 47 is provided correspondingly to the upper end of the adjustment seat and the positioning protrusion, and a moving distance is provided between the limiting protrusion and the positioning protrusion.

Positioning posts 48 are installed on both sides of the upper and lower connecting rods on the adjusting seat, and the connecting rod rotates within the range between the two positioning posts. The outer end of the connecting rod extends out of the lower connecting seat, and a gripping ball handle 49 is arranged on the outer end of the connecting rod.

The adjusting seat and the limiting pawl are provided with abutment posts 50 correspondingly, and abutment posts are installed between the limiting pawl and the adjusting seat. The spring 51 and the limiting pawl abut against the abutting column and cannot rotate downward, but can rotate upward, thereby realizing the one-way limiting of the ratchet.

The end of the connecting rod and the lifting pawl are provided with a limit column 52 correspondingly, and a limit spring 53 is installed between the lifting pawl and the connecting rod, and the lifting pawl abuts against the upper limit of the limit column. When the connecting rod rotates, the lifting pawl rises upward with the end of the connecting rod, and the end of the lifting pawl is placed between two adjacent ratchet teeth, thereby lifting the guide column upward. After the guide column is lifted up a certain distance, the end of the limit pawl is placed between two adjacent ratchet teeth to limit the guide column and prevent the guide column from moving downward. Then the connecting rod rotates back to the original position to perform the next lifting action. The other structures are the same as those in Example 1.

After the folding chair is unfolded and used, when the height needs to be adjusted, the adjustment seat is rotated inward to adjust it in place, and the adjustment seat can be pushed to operate by the connecting rod. The adjustment seat is limited between the lower connecting seat and the positioning pin. At this time, the end of the limit pawl and the push-up pawl are both placed between two adjacent ratchets. Then the connecting rod is rotated, and the push-up pawl rises upward with the end of the connecting rod. The end of the push-up pawl is placed between two adjacent ratchets, thereby pushing the guide column upward. After the guide column is lifted up a certain distance, the end of the limit pawl is placed between two adjacent ratchets to limit the guide column and prevent the guide column from moving downward. Then the connecting rod rotates back in the opposite direction to perform the next lifting action until the height of the folding chair is adjusted in place to meet the use needs of different users and make people more comfortable sitting on the folding chair. During the folding process of the folding chair, the upper connecting seat and the lower connecting seat move away from each other, and the guide column moves upward relative to the lower connecting seat. At this time, the limit pawl and the push-up pawl will not hinder the ratchet. After folding, the guide column cannot move in the opposite direction under the action of the limit pawl and the push-up pawl. In other words, after the folding chair is folded, it will not automatically unfold, which plays a positioning role, and it is no longer necessary to tie the folded folding chair with a strap to position it. When unfolding and using it next time, first move the positioning pin so that the positioning pin loses its constraint on the adjustment seat. Under the action of the ejection spring, the adjustment seat rotates outward, and the limit pawl and the push-up pawl separate from the ratchet, losing the constraint on the guide column. At this time, the folding chair can be easily unfolded and used.

The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims (19)

A folding chair structure that is easy to fold is characterized in that it includes an upper connecting seat and a lower connecting seat, at least three groups of folding frames are connected between the upper connecting seat and the lower connecting seat, and the folding frames include a support rod and a foot rod hinged together in an X-shaped structure, the lower end of the support rod is hinged on the lower connecting seat, the upper end of the foot rod is hinged on the upper connecting seat, the upper end of the support rod extends upward to form a seat cloth connecting end, and the lower end of the foot rod extends downward to form a supporting foot end. According to the foldable chair structure that is easy to fold as described in claim 1, its characteristic is that the upper connecting seat is connected to the guide column, the lower connecting seat is provided with a guide hole corresponding to the guide column, and the guide column and the guide hole are movably connected. According to the foldable chair structure that is easy to fold as described in claim 1, its characteristic is that both the support rod and the foot rod are provided with a reinforcing sleeve, and the reinforcing sleeves on the support rod and the foot rod are rotatably connected together to realize the hinge connection of the support rod and the foot rod. According to the foldable chair structure that is easy to fold as described in claim 1, it is characterized in that two upper hinged ears are provided at the connection position between the upper connecting seat and the foot rod, and the upper end of the foot rod is hinged between the two upper hinged ears; two lower hinged ears are provided at the connection position between the lower connecting seat and the support rod, and the lower end of the support rod is hinged between the two lower hinged ears. The foldable chair structure that is easy to fold according to claim 1 is characterized in that the lower end of the foot rod is connected to the support. According to the foldable chair structure that is easy to fold as described in claim 5, it is characterized in that the support includes a connecting sleeve and a supporting body, the connecting sleeve is connected to the lower end of the foot rod, a universal ball head is provided at the lower end of the connecting sleeve, a connecting groove that is adapted to the universal ball head is provided on the supporting body, and the universal ball head is rotatably installed in the connecting groove. According to the foldable chair structure that is easy to fold as described in claim 6, it is characterized in that an annular limit plate is installed at the open end of the connecting groove on the support body, the inner diameter of the limit plate is smaller than the diameter of the universal ball head, and the limit plate is connected to the universal ball head movable set. According to the foldable chair structure that is easy to fold as described in claim 1, it is characterized in that the foot rod includes a connecting section, an inclined section, and a bent section arranged in sequence from top to bottom, the inclined section is inclined outward from top to bottom, the bent section is bent downward, and the angle between the bent section and the inclined section is an obtuse angle. A foldable chair structure that is easy to fold according to any one of claims 1 to 8, characterized in that the support rods of one part of the folding frame are front support rods, and the support rods of another part of the folding frame are rear support rods, the upper ends of the rear support rods are connected to extension rods, and the upper ends of the extension rods are higher than the upper ends of the front support rods. According to the foldable chair structure that is easy to fold as described in claim 9, it is characterized in that the extension rod is detachably connected to the rear support rod; the upper connecting seat is connected to a card seat, or the lower connecting seat is connected to a card seat, or both the upper connecting seat and the lower connecting seat are connected to a card seat; the card seat is provided with a card seat that matches the extension rod The extension rod is folded and clamped in the clamping slot on the clamping seat. According to the foldable chair structure that is easy to fold as described in claim 9, it is characterized in that the upper end of the extension rod and the upper end of the front support rod are both equipped with anti-scratch caps. According to a foldable chair structure that is easy to fold as described in claim 9, it is characterized in that the support rod includes a lower rod and an upper rod, the angle between the lower rod and the upper rod is an obtuse angle, and the angle between the lower rod and the upper rod of the front support rod is greater than the angle between the lower rod and the upper rod of the rear support rod. According to a foldable chair structure that is easy to fold as described in claim 2, it is characterized in that a height adjustment mechanism is installed on the lower connecting seat, the height adjustment mechanism includes an adjusting seat, a connecting rod, a limiting pawl, and a pushing pawl, a plurality of ratchets arranged at intervals up and down are provided on the outer wall of the guide column, a positioning pin is installed on the lower connecting seat, one end of the adjusting seat is hinged on the lower connecting seat, the other end of the adjusting seat is limited between the lower connecting seat and the positioning pin, and an ejection spring is installed between the adjusting seat and the lower connecting seat; the connecting rod is hinged on the adjusting seat, and the pushing pawl is hinged on one end of the connecting rod; the limiting pawl is hinged on the adjusting seat, and the ends of the limiting pawl and the pushing pawl are placed between two adjacent ratchets; the connecting rod rotates to cause the pushing pawl to rotate upward and thereby push the guide column to move upward. According to a folding chair structure that is easy to fold as described in claim 13, it is characterized in that connecting holes are provided on the lower connecting seat corresponding to the positioning pin, a mounting sleeve is provided on the edge of the connecting hole on the lower connecting seat, a boss is provided on the positioning pin, the positioning pin is adaptively connected to the connecting hole, the boss is supported on the lower connecting seat at the bottom of the mounting sleeve, the positioning pin extends upward out of the mounting sleeve, the boss abuts against the reset spring, and the reset spring abuts against the mounting sleeve. According to claim 13, a folding chair structure that is easy to fold is characterized in that mounting grooves are correspondingly arranged on the lower connecting seat and the adjusting seat, the adjusting seat is installed in the mounting groove, the lower end of the adjusting seat is hinged to the lower end of the mounting groove, a positioning platform is provided on the upper part of the mounting groove, the ejection spring is installed on the positioning platform, and the upper part of the adjusting seat is placed between the positioning platform and the positioning pin. According to the folding chair structure that is easy to fold as described in claim 15, it is characterized in that a positioning protrusion is provided on the upper side wall of the installation groove, and a limiting protrusion is provided correspondingly on the upper end of the adjustment seat and the positioning protrusion, and a moving distance is provided between the limiting protrusion and the positioning protrusion. According to the foldable chair structure that is easy to fold as described in claim 13, it is characterized in that positioning columns are installed on both upper and lower sides of the connecting rod on the adjustment seat, and the connecting rod rotates within the range between the two positioning columns. According to the foldable chair structure that is easy to fold as described in claim 13, it is characterized in that abutment columns are correspondingly provided on the adjustment seat and the limit pawl, an abutment spring is installed between the limit pawl and the adjustment seat, and the limit pawl abuts on the abutment column. According to the foldable chair structure that is easy to fold as described in claim 13, it is characterized in that a limit column is correspondingly provided at the end of the connecting rod and the pushing pawl, a limit spring is installed between the pushing pawl and the connecting rod, and the pushing pawl abuts against the limit limit of the limit column.