Folding chair

Abstract

The utility model relates to the technical field of articles for daily use, in particular to a folding chair which comprises a sitting main body and a supporting main body, the supporting main body comprises a lower mounting seat and lower supporting legs, the lower mounting seat is provided with a plurality of first rotating grooves, and the lower supporting legs are mounted on the lower mounting seat through the first rotating grooves; a first transmission part is arranged at the upper end of each lower supporting leg, a longitudinally movable driving block is arranged in the lower mounting seat, a plurality of second transmission parts are formed on the driving block, and the second transmission parts are in transmission connection with the first transmission parts of the lower supporting legs; a fixing device is arranged below the driving block and used for fixing the driving block when the multiple lower supporting legs are in the unfolded state, and then the lower supporting legs are fixed. The fixing device is arranged below the driving block, and the fixing device can fix the driving block and then fix the lower supporting leg when the lower supporting leg is unfolded, so that the situation that the lower supporting leg is in transmission fit with the corresponding second transmission part due to external force when the lower supporting leg is accidentally touched in the moving process, and consequently the lower supporting leg is shrunk is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of life utensils, and specifically relates to a folding chair. BACKGROUND

[0002] When going on an outdoor excursion, fishing or barbecuing, we usually carry a folding chair for resting, which is easy to fold and portable. It is suitable for outdoor and temporary use and is also an emergency item for home use.

[0003] A folding chair is disclosed in Chinese Utility Model Patent No. CN218355233U, which comprises a support body provided with a plurality of first rotating parts, a lower support leg installed on the support body, a first transmission part provided at the upper end of the lower support leg, a linkage member longitudinally movable installed on the support body, a plurality of second transmission parts formed on the driving block, and a plurality of first transmission parts of the lower support legs in transmission connection with the second transmission parts. The driving block can drive the plurality of lower support legs to swing around the first rotating part under the action of external force. The lower support leg is rotatably installed on the support body through the first rotating part. When two or more lower support legs are unfolded or folded, the remaining lower support legs will be unfolded or folded simultaneously with the corresponding second transmission parts. It is not necessary to disassemble and assemble the lower support legs one by one, which saves time and effort and makes the unfolding and folding operation extremely simple.

[0004] The folding chair disclosed above needs to be moved. The transmission connection structure of the lower support leg and the driving block relies only on external force to achieve unfolding or folding. During the moving process, if the lower support leg is accidentally touched, the lower support leg will be in transmission cooperation with the corresponding second transmission part due to external force, causing abnormal swinging and contraction around the first rotating part. After the folding chair is moved to the right position, the lower support leg needs to be unfolded again for normal use. SUMMARY

[0005] In view of the above technical problems of the prior art, the utility model provides a folding chair.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The application provides a folding chair, which comprises a sitting body and a supporting body for supporting the sitting body, wherein the supporting body comprises a lower mounting base and lower supporting legs, the lower mounting base is provided with a plurality of first rotating grooves, and the lower supporting legs are mounted on the lower mounting base through the first rotating grooves; the upper end of the lower supporting leg is provided with a first transmission part, the lower mounting base is provided with a driving block which can move longitudinally, the driving block is formed with a plurality of second transmission parts, the plurality of second transmission parts are in transmission connection with the first transmission parts of the plurality of lower supporting legs, so that the driving block can synchronously drive the plurality of lower supporting legs to swing around the first rotating part under external force operation; the lower side of the driving block is provided with a fixing device, and the fixing device is used for fixing the driving block in the state that the plurality of lower supporting legs are supported, so as to fix the lower supporting legs.

[0008] Preferably, the fixing device is arranged at the bottom of the lower mounting base, and the fixing device comprises a bottom shell and a movable plate arranged in the bottom shell; the bottom of the driving block is extended with a hanging lug, the hanging lug can pass through the lower mounting base and enter the fixing device in the state that the lower supporting legs are supported, and hook the bottom of the movable plate; the lower mounting base is provided with a through hole for the hanging lug to pass through.

[0009] Preferably, the number of the movable plates and the number of the hanging lugs are both two, the two movable plates are oppositely arranged, and the two hanging lugs are oppositely arranged; the two hanging lugs hook the bottom regions of the corresponding movable plates away from the inner wall of the bottom shell.

[0010] Preferably, the fixing device further comprises a top block which can move longitudinally, the top block is arranged between the two movable plates and below the two movable plates, and is used for driving the two movable plates to move transversely away from each other, so that the movable plates are separated from the hanging lugs.

[0011] Preferably, the bottom shell is provided with a first reset spring for resetting the top block and a second reset spring for resetting the movable plate, the first reset spring is arranged at the top of the top block, and the second reset spring is arranged between the outer wall of the movable plate and the inner wall of the bottom shell.

[0012] Preferably, the lower mounting base is provided with a third reset spring for resetting the driving block after the movable plate is separated from the hanging lug; the lower mounting base is further provided with a connecting rod, the connecting rod passes through the third reset spring and penetrates the driving block, and the driving block can move longitudinally along the connecting rod; the top of the driving block is provided with a supporting block for clamping and supporting the lower supporting legs in the state that the lower supporting legs are supported, the supporting block has a cross structure, and the inner end of the lower supporting leg is formed with a stop groove matched with the stop of the supporting block.

[0013] Preferably, the first rotating groove is provided with a first rotating shaft for swinging of the lower supporting leg; the first transmission part is a gear part formed at the inner end of the lower supporting leg; and the second transmission part is a plurality of rack protrusions distributed in the circumferential direction of the driving block, each rack protrusion is arranged along the movement direction of the driving block, and the plurality of rack protrusions are respectively engaged with the corresponding gear parts of the plurality of lower supporting legs.

[0014] Preferably, the seat body comprises an upper mounting seat and upper supporting legs, the upper mounting seat is provided with a plurality of second rotating grooves, the plurality of upper supporting legs are mounted on the upper mounting seat through the second rotating grooves, and the second rotating grooves are provided with second rotating shafts for swinging of the upper supporting legs.

[0015] Preferably, the upper supporting leg comprises at least two telescopic positioning telescopic rods, and elastic positioning members are arranged between the telescopic rods to position the two telescopic rods after extension.

[0016] Preferably, the top of the lower mounting seat is provided with a rotating seat, a rotating bearing is embedded in the rotating seat, and the upper mounting seat is rotatably connected to the rotating seat through the rotating bearing; the upper mounting seat is further provided with a stop member, the top of the lower mounting seat is provided with a plurality of stop holes which are circumferentially arranged on the top of the lower mounting seat and stop the stop member.

[0017] The utility model discloses the beneficial effect that:

[0018] The utility model discloses a folding chair, the lower supporting leg is rotatably installed in the lower mounting seat through the first rotating groove, and the first transmission part in the inner end of the lower supporting leg is in transmission connection with the second transmission part of the driving block, a plurality of second transmission parts are formed on one driving block, when one of the lower supporting legs is driven to unfold or fold, the remaining lower supporting legs will be unfolded or folded at the same time through the transmission cooperation with the corresponding second transmission part, and it is not necessary to drive the lower supporting legs one by one, which not only saves time and energy, but also makes the operation extremely simple when unfolding and folding. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the perspective view of the folding chair unfolded in the embodiment.

[0020] Figure 2 It is the perspective view of the folding chair folded in the embodiment.

[0021] Figure 3 It is the explosion view of the supporting body in the embodiment.

[0022] Figure 4 It is the explosion view of the fixing device in the embodiment.

[0023] Figure 5 It is the sectional view of the upper supporting leg hidden in the embodiment.

[0024] Figure 6 It is Figure 5Enlarged view at B.

[0025] Figure 7 For Figure 5 Enlarged view at B.

[0026] Figure 8 Another perspective view of the folded chair in the embodiment.

[0027] Figure 9 For Figure 8 Enlarged view at C.

[0028] Figure 10 An exploded view of the seat body in the embodiment.

[0029] Figure 11 A sectional view of the folded chair in the embodiment when the stopper is inserted into the stop hole.

[0030] Figure 12 A sectional view of the folded chair in the embodiment when the stopper is disengaged from the stop hole.

[0031] Reference signs: 1, lower mounting seat; 10, first rotating groove; 11, through hole; 12, first rotating shaft; 13, driving block; 131, hanging ear; 132, supporting block; 133, rack protrusion; 14, connecting rod; 15, third return spring; 16, rotating seat; 17, rotating bearing; 18, stop hole; 19, stopper rod

[0032] 2, lower leg; 20, gear member; 21, stop groove;

[0033] 3, fixing device; 30, bottom shell; 31, movable plate; 32, top block; 33, first return spring; 34, second return spring;

[0034] 4, upper mounting seat; 40, second rotating groove; 41, second rotating shaft; 42, insertion hole;

[0035] 5, upper leg; 50, telescopic rod; 51, elastic positioning member; 52, elastic sheet; 53, protruding point; 54, positioning hole;

[0036] 6, stopper; 60, push rod; 601, hook; 61, insertion rod; 611, arc-shaped block; 612, hook groove; 613, guide surface; 62, blocking sheet; 63, fourth return spring. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] A folding chair in the embodiment, such as Figures 1 to 12As shown, including the ride body and for supporting the support body, the support body includes a lower mounting seat 1 and a lower leg 2, the lower mounting seat 1 is formed around three or more equidistantly spaced first rotating groove 10, a plurality of lower leg 2 through the first rotating groove 10 rotatingly mounted to the lower mounting seat 1, and a first rotating shaft 12 is also respectively provided in each first rotating groove 10, the first rotating shaft 12 is mounted at both ends in the first rotating groove 10, so that the lower leg 2 can be swung around the first rotating shaft 12 by operating the lower leg 2 with external force, realizing the unfolding and folding of the lower leg 2.

[0039] Further, the upper end of the lower leg 2 is provided with a gear member 20 as a first transmission part, and the lower mounting seat 1 is provided with a longitudinally movable driving block 13, the driving block 13 is formed with a plurality of second transmission parts, the second transmission part is a plurality of rack protrusions distributed along the circumference of the driving block 13, each rack protrusion 133 is arranged along the movement direction of the driving block 13, and the plurality of rack protrusions 133 respectively engage the corresponding gear members 20 of the plurality of lower legs 2. Among them, the number of lower legs 2 and rack protrusions 133 is the same, the rack protrusions 133 on the driving block 13 engage and transmit with the gear members 20 of the corresponding lower legs 2, when the driving block 13 is raised and lowered, the rack protrusions 133 and the gear members 20 are engaged and transmitted, and all the lower legs 2 can be swung around the first rotating shaft 12 under the action of external force, realizing the unfolding and folding of the lower leg 2, without the need to disassemble and install the lower support leg one by one.

[0040] Further, the lower mounting seat 1 is also provided with a connecting rod 14, the top of the lower mounting seat 1 is provided with a connecting hole, the connecting rod 14 can pass from the bottom of the lower mounting seat 1, and the top of the connecting rod 14 is connected with the connecting hole. Among them, the connecting rod 14 also penetrates the driving block 13, the driving block 13 is provided with a through hole for the connecting rod 14 to penetrate, and the connecting hole is coaxial with the through hole. When the rack protrusions 133 and the gear members 20 are engaged and transmitted to make the driving block 13 rise and fall, the connecting rod 14 can guide the driving block 13 to move linearly, preventing the driving block 13 from deviating during the lifting process.

[0041] Further, the top of the driving block 13 is provided with a support block 132 for clamping the support in the state of the lower leg 2 being opened, the support block 132 is in the shape of a cross, and the inner end of the lower leg 2 is also formed with a stop groove 21 matched with the stop block 132, the support block 132 slides with the driving block 13 at the same time when the lower leg 2 is opened, and when the angle between the lower leg 2 and the connecting rod 14 is 45°, it is the best support structure, at this time, the outer convex block of the cross structure is clamped into the stop groove 21 to form a support, and the unfolding of the lower leg 2 is stopped and locked, so that the lower leg 2 forms a more stable support to the support body.

[0042] Further, the bottom of the lower mounting base 1 is provided with a fixing device 3, which is used to fix the driving block 13 in the state that the lower support leg 2 is expanded, and further fix the lower support leg 2, so as to prevent the lower support leg 2 from being retracted due to accidental touch when the folding chair is moved. Specifically, the driving block 13 extends a hanging ear 131 at the bottom, when the lower support leg 2 is expanded, the gear part 20 on the lower support leg 2 can engage and drive the gear rack protrusion 133 on the driving block 13, so as to drive the driving block 13 to move downward along the connecting rod 14, and the hanging ear 131 moves downward along with the driving block 13, so as to make the hanging ear 131 pass out of the lower mounting base 1 and pass into the fixing device 3, and the fixing device 3 can fix the hanging ear 131, and further fix the lower support leg 2. In order to make the hanging ear 131 pass out of the lower mounting base 1 smoothly, the lower mounting base 1 is further provided with a through hole 11 for the hanging ear 131 to pass out.

[0043] The fixing device 3 comprises a bottom shell 30, and the bottom shell 30 is provided with a movable plate 31, when the hanging ear 131 passes into the bottom shell 30, the hanging ear 131 can hook the bottom area of the movable plate 31 away from the inner wall of the bottom shell 30, so as to fix the driving block 13. In order to make the hanging ear 131 move to the bottom of the movable plate 31 smoothly, a wedge surface is further provided at the bottom of the hanging ear 131 and the top of the movable plate 31.

[0044] The number of the movable plate 31 and the hanging ear 131 is two, and the two movable plates 31 and the two hanging ears 131 are oppositely arranged respectively, and the two hanging ears 131 hook the bottom area of the corresponding movable plate 31 away from the inner wall of the bottom shell 30 respectively. When the hanging ear 131 hooks the bottom of the corresponding movable plate 31, the force on the driving block 13 is more uniform, and the deformation of the driving block 13 caused by long-time force on one side is avoided.

[0045] Further, the fixing device 3 further comprises a top block 32 which can move longitudinally, and the top block 32 is arranged between the two movable plates 31 and below the two movable plates 31, when the lower support leg 2 needs to be retracted, the top block 32 is first driven to move upward, so as to drive the two movable plates 31 to move transversely away from each other, so that the movable plate 31 is separated from the hanging ear 131, and then the lower support leg 2 is rotated, the gear part 20 on the lower support leg 2 engages and drives the gear rack protrusion 133 on the driving block 13, so as to drive the driving block 13 to move upward along the connecting rod 14, and the hanging ear 131 moves upward along with the driving block 13, so as to make the hanging ear 131 move away from the bottom shell 30 and return to the lower mounting base 1. In order to facilitate the driving of the top block 32 to move longitudinally, a protruding block is further provided at the bottom of the top block 32, and the protruding block penetrates the bottom of the bottom shell 30.

[0046] Further, the fixing device 3 further comprises a first reset spring 33 and a second reset spring 34. The first reset spring 33 is arranged on the top of the top block 32, the bottom of the first reset spring 33 abuts against the top of the top block 32, and the top of the first reset spring 33 abuts against the bottom of the lower mounting base 1, for resetting the top block 32 after moving upward. The second reset spring 34 is arranged between the outer wall of the movable plate 31 and the inner part of the bottom shell 30, one end of the second reset spring 34 abuts against the outer wall of the movable plate 31, and the other end of the second reset spring 34 abuts against the inner part of the bottom shell 30, for resetting the movable plate 31 after moving laterally. In use, first, the convex block is pushed upward, the top block 32 moves upward, the top block 32 spreads the two movable plates 31, and the two movable plates 31 move laterally away from each other, so that the movable plates 31 are separated from the hanging ears 131, at this time, the first reset spring 33 and the second reset spring 34 are in a compressed state, when the hanging ears 131 return to the lower mounting base 1, then the convex block is released, at this time, the top block 32 can return to the original position under the elastic force of the first reset spring 33, and the movable plate 31 can return to the original position under the action of the second reset spring 34. By arranging the first reset spring 33 and the second reset spring 34, the top block 32 and the movable plate 31 can be reset in time after the movable plate 31 is separated from the hanging ears 131, so that the movable plate 31 and the top block 32 are prevented from being stuck.

[0047] Further, the third reset spring 15 is arranged in the lower mounting base 1, the third reset spring 15 is sleeved on the connecting rod 14, the top of the third reset spring 15 abuts against the bottom of the support block 132, and the bottom of the third reset spring 15 abuts against the inner bottom wall of the lower mounting base 1. In use, when the lower supporting leg 2 is in the spread state, the driving block 13 moves downward at this time, the third reset spring 15 is in a compressed state, when the movable plate 31 is separated from the hanging ears 131 under the pushing of the top block 32, the driving block 13 can drive the driving block 13 to move upward along the connecting rod 14 under the action of the third reset spring 15, so that the hanging ears 131 return to the lower mounting base 1, and the resetting is completed. Since the third reset spring 15 can drive the driving block 13 to move along the connecting rod 14, and the gear part 20 on the lower supporting leg 2 is in meshing transmission with the rack protrusion 133 on the driving block 13, when the driving block 13 moves upward along the connecting rod 14 under the driving of the third reset spring 15, the driving block 13 can drive the lower supporting leg 2 to swing, and the contraction of the lower supporting leg 2 is completed. This design can quickly complete the contraction of the lower supporting leg 2 when the lower supporting leg 2 needs to be contracted, and is more convenient to use.

[0048] Further, the seating body comprises the upper mounting base 4 and the upper supporting legs 5, the upper mounting base 4 is formed with three or more equidistantly arranged second rotating grooves 40, the upper supporting legs 5 are rotatably mounted on the upper mounting base 4 through the second rotating grooves 40, and a second rotating shaft 41 is arranged in each second rotating groove 40, and the two ends of the second rotating shaft 41 are mounted in the second rotating groove 40, so that the upper supporting legs 5 can be swung around the first rotating shaft 12 by operating the upper supporting legs 5 with external force.

[0049] The first rotating groove 10 and the second rotating groove 40 are vertically aligned, so that the lower supporting legs 2 and the upper supporting legs 5 are vertically aligned, and the lower supporting legs 2 are formed with receiving grooves along the length direction on the outer side surface for receiving the upper supporting legs 5, and the cross-sectional area of the upper supporting legs 5 is smaller than that of the lower supporting legs 2. When it is needed to be received, the upper supporting legs 5 are swung downward around the second rotating shaft 41, so that the upper supporting legs 5 are just placed in the receiving grooves of the lower supporting legs 2, at this time, the upper supporting legs 5 and the lower supporting legs 2 are overlapped, and the overall volume of the folding chair is further reduced.

[0050] The seating body further comprises a seat cushion (not shown in the figure), the seat cushion is connected to the top of the upper supporting legs 5, and the seat cushion can be expanded and supported by the upper supporting legs 5, so as to facilitate the user to sit or place articles.

[0051] Further, the upper supporting legs 5 comprise at least two telescopic positioning telescopic rods 50, and an elastic positioning member 51 is arranged between two adjacent telescopic rods 50 for positioning the two telescopic rods 50 after extension. Preferably, two adjacent upper supporting legs 5 have two telescopic rods 50, and the other two adjacent upper supporting legs 5 have three telescopic rods 50, and the seat cushion has a cavity when expanded, so as to improve the comfort of sitting.

[0052] The elastic positioning member 51 comprises a U-shaped elastic sheet 52 and a protrusion 53 formed on one end of the elastic sheet 52, and the telescopic rod 50 is provided with a positioning hole 54 matched with the protrusion 53, the inner telescopic rod 50 is provided with the elastic positioning member 51, and the outer telescopic rod 50 is provided with the positioning hole 54, so that the inner telescopic rod 50 is fixed with the outer telescopic rod 50, and the telescopic positioning of the telescopic rod 50 is realized.

[0053] Further, the seating body and the supporting body can be fixedly connected, specifically, as shown in Figures 8-9 a plurality of stop rods 19 are arranged on the top of the lower mounting base, and a plurality of insertion holes 42 are formed on the bottom of the upper mounting base 4, the plurality of insertion holes 42 and the plurality of stop rods 19 are one-to-one corresponding, and when the insertion hole 42 is inserted into the stop rod 19, the seating body and the supporting body are fixedly connected, and remain relatively static.

[0054] Further, the seat body and the support body can also be rotatably connected, specifically, the top of the lower mounting base 1 is provided with a rotating seat 16, and a rotating bearing 17 is embedded in the rotating seat 16, and the upper mounting base 4 is rotatably connected to the rotating seat 16 through the rotating bearing 17. This design can rotate the seat body according to the needs of the occupant, thereby improving the practicability of the folding chair.

[0055] Further, the upper mounting base 4 is also provided with a mounting groove arranged along the height direction of the upper mounting base 4, and the mounting groove is provided with a stop piece 6, and the top of the lower mounting base 1 is provided with a stop hole 18 which is in stop cooperation with the stop piece 6, and a plurality of stop holes 18 are equidistantly arranged around the top of the lower mounting base 1. This design can fix the seat body according to the needs of the occupant, thereby further improving the practicability of the folding chair.

[0056] The stop piece 6 comprises a push rod 60, an insertion rod 61 and a blocking piece 62 arranged in sequence from top to bottom, the insertion rod 61 is arranged in the push rod 60, and the insertion rod 61 can move axially along the push rod 60, the blocking piece 62 is fixedly arranged at the bottom of the upper mounting base 4, the bottom of the insertion rod 61 penetrates the blocking piece 62 along the thickness direction of the blocking piece 62, and a guide hole for the insertion rod 61 to penetrate is arranged on the blocking piece 62. The push rod 60 is provided with a hook 601, the insertion rod 61 is provided with a hook groove 612 and an arc-shaped block 611 arranged in sequence from top to bottom, and the hook 601 is hooked on the hook groove 612 or the arc-shaped block 611 by changing the position, so as to realize the insertion of the insertion rod 61 into the stop hole 18 or the disengagement of the insertion rod 61 from the stop hole 18.

[0057] In use, in the initial state, the bottom of the hook 601 is hooked on the bottom of the arc-shaped block 611, at this time, the insertion rod 61 is located in the push rod 60 and does not interfere with the stop hole 18, and the seat body can be freely rotated; when it is needed to fix the seat body, first, the seat body is rotated to align the insertion rod 61 with the stop hole 18, and then the push rod 60 is pushed downward, the hook 601 moves downward together with the push rod 60, in order to make the bottom of the hook 601 smoothly disengage from the bottom of the arc-shaped block 611, an inclined guide surface 613 is arranged below the arc-shaped block 611, the bottom of the hook 601 slides along the inclined surface of the guide surface 613, and the hook 601 is assisted to smoothly disengage from the bottom of the arc-shaped block 611 by means of the inclination angle of the guide surface 613. During the downward movement of the hook 601, the insertion rod 61 moves downward synchronously under the action of gravity, after the hook 601 completely disengages from the arc-shaped block 611, the insertion rod 61 continues to move downward under the action of gravity, and finally the bottom of the insertion rod 61 is inserted into the stop hole 18 through the guide hole, at this time, the hook 601 is hooked in the hook groove 612; when it is needed to release the fixing state of the seat body, the push rod 60 is pushed downward again, the hook 601 moves downward along the arc-shaped block 611, so that the hook 601 hooks the bottom of the arc-shaped block 611 again, so that the insertion rod 61 disengages from the stop hole 18.

[0058] The stopper 6 further comprises a fourth reset spring 63 arranged between the stop sheet 62 and the push rod 60, the top of the fourth reset spring 63 abutting against the bottom of the push rod 60, and the bottom of the fourth reset spring 63 abutting against the top of the stop sheet 62, the fourth reset spring 63 pushing the top of the push rod 60 out of the upper mounting seat 4 by upward elastic force, so as to facilitate the push rod 60 to be pushed by the finger.

[0059] In the description of the present application, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0060] Therefore, the above detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A folding chair, comprising a seating body and a support body for supporting the seating body, characterized in that, The support body includes a lower mounting base (1) and lower support legs (2). The lower mounting base (1) is provided with multiple first rotating grooves (10). Multiple lower support legs (2) are mounted on the lower mounting base (1) through the first rotating grooves (10). A first transmission part is provided at the upper end of the lower support leg (2). A drive block (13) that can move longitudinally is provided in the lower mounting base (1). The drive block (13) is formed with multiple second transmission parts. The multiple second transmission parts are connected to the first transmission parts of the multiple lower support legs (2) so that the drive block (13) can synchronously drive the multiple lower support legs (2) to swing around the first rotating part under external force operation. A fixing device (3) is provided below the drive block (13). The fixing device (3) is used to fix the drive block (13) in the state where the multiple lower support legs (2) are spread out, thereby fixing the lower support legs (2).

2. A folding chair according to claim 1, characterized in that, The fixing device (3) is located at the bottom of the lower mounting base (1). The fixing device (3) includes a bottom shell (30) and a movable plate (31) located inside the bottom shell (30). The bottom of the drive block (13) extends with a hanging ear (131). The hanging ear (131) can pass through the lower mounting base (1) and into the fixing device (3) when the lower support leg (2) is open, and hook the bottom of the movable plate (31). The lower mounting base (1) is provided with a through hole (11) for the hanging ear (131) to pass through.

3. A folding chair according to claim 2, characterized in that, There are two movable plates (31) and two hanging ears (131). The two movable plates (31) and the two hanging ears (131) are respectively arranged opposite to each other. The two hanging ears (131) hook the bottom area of ​​the corresponding movable plate (31) away from the inner wall of the bottom shell (30).

4. A folding chair according to claim 3, characterized in that, The fixing device (3) also includes a longitudinally movable top block (32), which is located between the two movable plates (31) and below the two movable plates (31) to drive the two movable plates (31) to move laterally in opposite directions so that the movable plates (31) are disengaged from the lugs (131).

5. A folding chair according to claim 4, characterized in that, The bottom shell (30) is provided with a first reset spring (33) for resetting the top block (32) and a second reset spring (34) for resetting the movable plate (31). The first reset spring (33) is located on the top of the top block (32), and the second reset spring (34) is located between the outer wall of the movable plate (31) and the inside of the bottom shell (30).

6. A folding chair according to claim 5, characterized in that, The lower mounting base (1) is provided with a third reset spring (15) for resetting the drive block (13) after the movable plate (31) is disengaged from the hook (131); the lower mounting base (1) is also provided with a connecting rod (14), the connecting rod (14) passes through the third reset spring (15) and through the drive block (13), and the drive block (13) can move longitudinally along the connecting rod (14); the top of the drive block (13) is provided with a support block (132) for clamping and supporting the lower support leg (2) in the open state, the support block (132) has a cross structure, and the inner end of the lower support leg (2) is formed with a stop groove (21) that cooperates with the stop of the support block (132).

7. A folding chair according to claim 1, characterized in that, The first rotating groove (10) is provided with a first rotating shaft (12) for the lower support leg (2) to swing; the first transmission part is a gear (20) formed on the inner end of the lower support leg (2); the second transmission part is a plurality of rack protrusions (133) distributed around the drive block (13) in the circumferential direction, each rack protrusion (133) is arranged along the movement direction of the drive block (13), and the plurality of rack protrusions (133) respectively mesh with the gears (20) corresponding to the lower support leg (2).

8. A folding chair according to claim 1, characterized in that, The main body of the seat includes an upper mounting base (4) and upper support legs (5). The upper mounting base (4) is provided with multiple second rotating grooves (40). Multiple upper support legs (5) are mounted on the upper mounting base (4) through the second rotating grooves (40). The second rotating grooves (40) are provided with second rotating shafts (41) for the upper support legs (5) to swing. The seat also includes a seat cushion, which is connected to the top of the upper support legs (5). When the multiple upper support legs (5) are spread out, they can spread out the seat cushion and provide support for the seat cushion.

9. A folding chair according to claim 8, characterized in that, The upper support leg (5) includes at least two telescopic rods (50) that can be telescopically positioned, and an elastic positioning element (51) is provided between the telescopic rods (50) to position the two telescopic rods (50) after they are extended.

10. A folding chair according to claim 8, characterized in that, The top of the lower mounting base (1) is provided with a rotating seat (16), and a rotating bearing (17) is embedded in the rotating seat (16). The upper mounting base (4) is rotatably connected to the rotating seat (16) through the rotating bearing (17). The upper mounting base (4) is also provided with a stop member (6). The top of the lower mounting base (1) is provided with a stop hole (18) that cooperates with the stop member (6). Multiple stop holes (18) are arranged around the top of the lower mounting base (1) at intervals.

Images