Folding chair frame and folding dining chair

Abstract

The utility model provides a folding chair frame and a folding dining chair, the folding chair frame comprises a plurality of supporting leg rods and a plurality of connecting assemblies, the plurality of connecting assemblies are connected between every two adjacent supporting leg rods in a one-to-one correspondence mode, and fixed hinge pieces and sliding hinge pieces are arranged on the supporting leg rods. The sliding hinge piece is located between the fixed hinge piece and the bottom end of the supporting leg rod, and the sliding hinge piece can slide along the supporting leg rod; the connecting assembly comprises crossed rods which are arranged in pairs in a crossed mode, the crossed rods are hinged to one another at the crossed positions, the top ends of the crossed rods are hinged to the fixed hinge pieces on the supporting leg rods on one side, and the bottom ends of the crossed rods are hinged to the sliding hinge pieces on the supporting leg rods on the other side; and the bottom ends of the supporting leg rods can be telescopically adjusted. According to the folding chair frame provided by the utility model, when the folding chair frame is unfolded, the bottom ends of the supporting leg rods can still be telescopically adjusted, so that the height of the folding chair frame can be flexibly adjusted, and the adaptability of the folding chair applying the folding chair frame provided by the utility model to complex scenes is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of folding chairs, in particular to a folding chair frame and a folding dining chair comprising the folding chair frame. Background Art

[0002] In modern life, chairs are essential daily furniture for people to sit and rest, avoiding fatigue caused by lying or standing for a long time and reducing energy consumption from standing for a long time. Therefore, they are widely used in various training institutions, schools at all levels, public places, hospitals, restaurants, hotels, companies, homes and other places for users.

[0003] Chairs have a variety of structural designs. Among them, folding chairs are a special type of chair that is not only easy to carry and transport, but can also be folded when not in use to reduce the space it occupies. Folding chairs are usually a combination of pipes and fabrics. The fabric seat surface can evenly distribute the load when the user sits on it to ensure user comfort. A backrest can also be set on the folding chair to improve comfort, or a dining tray can be installed to use it as a children's dining chair, which has excellent expandability.

[0004] However, existing folding chairs often cannot flexibly adjust the seat height during use and have poor adaptability to more complex usage scenarios. For example, when used as a children's dining chair, the seat height cannot be flexibly adjusted for different eating occasions, or the seat height cannot be adapted to the height changes of children.

[0005] Therefore, how to provide a folding dining chair that is easy to adjust the seat height has become a technical problem that needs to be solved urgently in the field. Utility Model Content

[0006] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a folding chair frame, the height of which can be flexibly adjusted to ensure the adaptability of the folding dining chair to complex scenes.

[0007] To achieve the above object, as one aspect of the utility model, a folding chair frame is provided, the folding chair frame comprising a plurality of supporting foot rods and a plurality of connecting assemblies, the plurality of connecting assemblies being connected one by one between each two adjacent supporting foot rods, the supporting foot rods being provided with a fixed hinge and a sliding hinge, the sliding hinge being located between the fixed hinge and the bottom end of the supporting foot rod, and the sliding hinge being able to slide along the supporting foot rod;

[0008] The connecting assembly includes a pair of cross rods arranged crosswise, the cross rods are hinged to each other at the intersection, and the top ends of the cross rods are hingedly connected to the fixed hinges on the supporting foot rods on one side, and the bottom ends of the cross rods are hingedly connected to the sliding hinges on the supporting foot rods on the other side; the bottom ends of the supporting foot rods are telescopically adjustable.

[0009] Optionally, the folding chair frame includes four supporting foot rods and corresponding four connecting assemblies, wherein the length of the tops of two adjacent supporting foot rods extending beyond the fixed hinge part is greater than the length of the tops of the other two supporting foot rods extending beyond the fixed hinge part.

[0010] Optionally, a foot pad is provided at the bottom end of the supporting foot rod, the bottom of the foot pad has a ground contacting plane, and the ground contacting planes at the bottom of multiple foot pads can be coplanar when the folding chair frame is opened.

[0011] Optionally, the material of the foot pad includes plastic.

[0012] Optionally, the bottom of the foot pad has a plurality of anti-slip convex strips arranged in parallel.

[0013] Optionally, the supporting leg includes a top tube and a bottom tube, the fixed hinge is arranged on the top tube, the sliding hinge is slidably arranged on the bottom tube, one of the top end of the bottom tube and the bottom end of the top tube is sleeved on the other, and the top tube and the bottom tube can slide relative to each other along the extension direction of the bottom tube.

[0014] Optionally, when the folding chair frame is opened, the bottom tube can slide relative to the top tube until the foot pad abuts against the sliding hinge.

[0015] Optionally, the portion of the top tube located above the fixed hinge is bent outward to form a vertical section, and the plurality of vertical sections are parallel to each other when the folding chair frame is opened.

[0016] Optionally, the vertical section length of at least one pair of the top tubes is longer than that of the other top tubes, the top tubes with longer vertical section lengths are used to fix back cushions, and the top ends of the top tubes with shorter vertical section lengths are used to fix dining plates.

[0017] Optionally, a locking mechanism is provided on the supporting foot rod, and the locking mechanism can selectively lock the relative position of the top tube and the bottom tube.

[0018] Optionally, the locking mechanism includes an elastic locking structure, which is arranged on one of the top tube and the bottom tube that is sleeved on the inner side, and has a locking opening on one of the top tube and the bottom tube that is sleeved on the outer side. The elastic locking structure can pop out into the locking opening when the top tube and the bottom tube move relative to each other until the locking opening corresponds to the position of the elastic locking structure, so as to lock the relative position of the top tube and the bottom tube.

[0019] Optionally, the locking mechanism also includes a gear adjustment component, which includes a mounting sleeve and an adjustment button, wherein the mounting sleeve is mounted on one of the top tube and the bottom tube that is mounted on the outside, and the adjustment button is movably connected to the mounting sleeve, the position of the mounting sleeve corresponds to the position of the locking opening, and the adjustment button can push the elastic locking structure out of the locking opening when being pressed.

[0020] Optionally, a pin hole is formed on the side wall of the inner tube, and the elastic locking structure includes a spring pin and a spring, one end of the spring abuts against the inner wall of the inner tube, and the other end of the spring is connected to the first end of the spring pin, and the spring is used to drive the second end of the spring pin to extend out of the inner tube through the pin hole through elastic force.

[0021] Optionally, the locking mechanism includes a stop bar and a stop assembly, the stop bar is arranged on one of the top tube and the bottom tube that is sleeved on the inner side, the stop assembly is arranged on one of the top tube and the bottom tube that is sleeved on the outer side, the stop bar includes a plurality of teeth distributed along the length direction of the top tube, and the stop assembly can be selectively pressed on the plurality of teeth of the stop bar to prevent the stop bar from passing.

[0022] Optionally, the stop assembly includes a fixing part, a pressing part and a stop block, the fixing part is fixedly arranged on one of the top tube and the bottom tube that is sleeved on the outside, the pressing part has a hinge part and a pressing part, the hinge part is hinged to the fixing part, the stop block is arranged between the hinge part and the stop strip, the hinge part has a cam pressing surface on the side facing the stop block, and the distance between each point on the cam pressing surface and the hinge axis of the hinge part gradually increases along the direction approaching the pressing part.

[0023] Optionally, the folding chair frame also includes at least one supporting assembly, both ends of which are respectively hinged to the same side of the paired cross rods along the height direction, and the supporting assembly can limit the maximum opening angle between the same side parts of the cross rods along the height direction.

[0024] Optionally, the support assembly includes a connecting member and a pair of hinged rods, the first ends of the hinged rods are hingedly connected to two opposite sides of the connecting member, and the second ends of the hinged rods are hingedly connected to the cross rods on both sides.

[0025] Optionally, a limiting groove is formed at the bottom of the connecting member, and the limiting groove passes through along its extension direction. The first ends of the hinged rods on both sides are hingedly arranged in the limiting groove and can rotate in the limiting groove. When the two hinged rods are in contact with the bottom surface of the limiting groove, the height of the connecting member is lower than the height of the second ends of the hinged rods on both sides.

[0026] Optionally, a first hinge hole is formed on both side walls at both ends of the limiting groove and penetrates to the outer surface of the connecting piece, and a second hinge hole is formed at the first end of the hinge rod and radially penetrates the hinge rod, and the hinge rod is hingedly connected to the connecting piece via a hinge axis passing through the first hinge hole and the second hinge hole.

[0027] Optionally, when the two hinged rods are in contact with the bottom surface of the limiting groove, the vertical sections of the plurality of top pipes are parallel to each other.

[0028] Optionally, a plurality of the fixed hinges are fixedly provided with folding handles, and the folding handles are located on the outer sides of the corresponding top tubes.

[0029] Optionally, the folding handle extends in the same direction as the bottom tube.

[0030] Optionally, the folding chair frame further comprises a dining tray, which can be fixedly connected to the top end of a portion of the supporting foot rod when the folding chair frame is opened.

[0031] Optionally, the bottom of the dining tray has a plurality of matching sleeves, and when the folding chair frame is opened, the top ends of some of the supporting foot rods can be inserted into the plurality of matching sleeves one by one.

[0032] Optionally, a crotch guard frame is also provided at the bottom of the dinner plate, both ends of the crotch guard frame are hinged to the bottom of the dinner plate, and the crotch guard frame can rotate relative to the dinner plate around an axis passing through two hinges, and the center of the crotch guard frame protrudes away from the dinner plate.

[0033] As a second aspect of the utility model, a folding dining chair is provided, comprising a seat cushion, a dining tray and the aforementioned folding chair frame, wherein the seat cushion is fixed on a plurality of supporting legs and can be spread out when the folding chair frame is opened, and the dining tray can be fixedly connected to the top ends of some of the supporting legs when the folding chair frame is opened.

[0034] Optionally, the bottom of the dining tray has a plurality of matching sleeves, and when the folding chair frame is opened, the top ends of some of the supporting foot rods can be inserted into the plurality of matching sleeves one by one.

[0035] Optionally, a crotch guard frame is also provided at the bottom of the dining plate, both ends of the crotch guard frame are hinged to the bottom of the dining plate, and the crotch guard frame can rotate relative to the dining plate around an axis passing through two hinges. The folding dining chair also includes a crotch guard cover and a connecting buckle. The crotch guard cover is provided on the crotch guard frame, and the connecting buckle is connected between the crotch guard cover and the seat cushion.

[0036] Optionally, the folding dining chair further comprises a backrest pad, the supporting foot rod comprises a top tube and a bottom tube, the fixed hinge is arranged on the top tube, the sliding hinge is slidably arranged on the bottom tube, the bottom tube is sleeved on the bottom end of the top tube, and can slide relative to the top tube along the extension direction of the bottom tube. The portion of the top tube located above the fixed hinge is bent outward to form a vertical section, and the plurality of vertical sections are parallel to each other when the folding chair frame is opened, and the vertical section length of at least one pair of the top tubes is longer than the vertical section length of the remaining top tubes; the backrest pad is fixed to the top tube with the longer vertical section length, and the dining tray can be fixedly connected to the top end of the top tube with the shorter vertical section length when the folding chair frame is opened.

[0037] Optionally, the folding dining chair further comprises a pair of guardrail pieces, wherein the two guardrail pieces are respectively connected between the vertical sections of the top tube with a longer length and the corresponding vertical sections of the top tube with a shorter length on both sides.

[0038] Optionally, the folding chair frame includes four supporting foot rods and corresponding four connecting assemblies, wherein the length of the tops of two adjacent supporting foot rods extending beyond the fixed hinge part is greater than the length of the tops of the other two supporting foot rods extending beyond the fixed hinge part.

[0039] In the folding chair frame and folding dining chair provided by the utility model, the top end of the cross rod is hinged to the fixed hinge fixed on the supporting foot rod, the bottom end of the cross rod is hinged to the sliding hinge, and is slidably set on the supporting foot rod through the sliding hinge, and the bottom end of the supporting foot rod is telescopically adjustable, so that when the folding chair frame is opened and folded, as the angle between the paired cross rods changes, the bottom end of the cross rod slides along the supporting foot rod, and, when the folding chair frame is opened, the positions of the cross rod and the supporting foot rod are relatively fixed. At this time, the bottom end of the supporting foot rod can still be telescopically adjusted to change the height of the supporting structure under the seat cushion, so that the height of the folding chair frame can be flexibly adjusted, ensuring the adaptability of the folding chair using the folding chair frame provided by the utility model to complex scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The utility model is further described below in conjunction with the accompanying drawings:

[0041] Figure 1 It is a structural schematic diagram of a folding chair frame provided by an embodiment of the utility model;

[0042] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the middle folding chair frame in area A;

[0043] Figure 3 yes Figure 1 A partial enlarged schematic diagram of the folding chair frame in area B.

[0044] Figure 4 It is a structural schematic diagram of one side of the folding chair frame provided by an embodiment of the utility model;

[0045] Figure 5 It is a structural schematic diagram of the other side of the folding chair frame provided by an embodiment of the utility model;

[0046] Figure 6 It is a top view schematic diagram of a folding chair frame provided by an embodiment of the utility model;

[0047] Figure 7 It is a structural schematic diagram of one side of the folding chair frame provided by an embodiment of the utility model in a folded state;

[0048] Figure 8 It is a schematic structural diagram of the other side of the folding chair frame provided by an embodiment of the utility model in a folded state;

[0049] Fig. 9 This is a schematic diagram of the principle of installing a dining tray on a folding chair frame provided by an embodiment of the utility model;

[0050] Fig.10 It is a structural schematic diagram of a folding chair frame provided by an embodiment of the utility model in a low position;

[0051] Fig.11 It is a structural schematic diagram of a folding dining chair provided by an embodiment of the utility model;

[0052] Fig.12 It is a structural schematic diagram of a locking mechanism in a folding chair frame provided in an embodiment of the utility model;

[0053] Figure 13 to Figure 14 It is a schematic diagram of the principle of locking the stop strip of the locking mechanism in the folding chair frame provided by the embodiment of the utility model.

[0054] Description of reference numerals:

[0055] Support foot bar 100; top tube 110; vertical section 111; bottom tube 120; foot pad 130; locking mechanism 140; mounting sleeve 141; adjustment button 142; connecting assembly 200; cross bar 210; fixed hinge 300; sliding hinge 400; supporting assembly 500; connecting member 510; hinged rod 520; folding handle 600; dining plate 700; matching sleeve 710; crotch guard frame 720. DETAILED DESCRIPTION

[0056] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0057] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present utility model. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0058] In the related art, the structure of a folding chair frame usually includes supporting legs and a cross tube structure connected between the supporting legs, the bottom end of the cross tube is hingedly connected to the bottom end of the supporting legs, and the top end of the cross tube is slidingly hingedly set on the supporting legs, so that the dining chair can be folded or opened by the contraction and opening of the cross tube. However, in this scheme, the top seat and the supporting legs are hingedly connected, making it difficult to flexibly change the relative height between the top seat and the supporting legs, and because the bottom end of the cross tube is fixedly hinged to the bottom end of the supporting legs, it is difficult for the supporting legs themselves to realize a telescopic design, resulting in the seat of the folding chair frame can only be maintained at a fixed height, and the usage scenario is single.

[0059] In order to solve the above technical problems, the utility model provides a folding chair frame, such as Figures 1 to 6 As shown, the folding chair frame includes a plurality of supporting foot rods 100 and a plurality of connecting assemblies 200, wherein the plurality of connecting assemblies 200 are connected between each two adjacent supporting foot rods 100 in a one-to-one correspondence, and the supporting foot rods 100 are provided with fixed hinges 300 and sliding hinges 400, wherein the sliding hinges 400 are located between the fixed hinges 300 and the bottom ends of the supporting foot rods 100, and the sliding hinges 400 can slide along the supporting foot rods 100;

[0060] The connecting assembly 200 includes a pair of cross rods 210 arranged crosswise, the cross rods 210 are hinged to each other at the intersection, and the top end of the cross rod 210 is hingedly connected to the fixed hinge 300 on the supporting foot rod 100 on one side, and the bottom end of the cross rod 210 is hingedly connected to the sliding hinge 400 on the supporting foot rod 100 on the other side; the bottom end of the supporting foot rod 100 is telescopically adjustable.

[0061] In the folding chair frame provided by the present invention, the top end of the cross rod 210 is hinged to the fixed hinge 300 fixed on the supporting foot rod 100, and the bottom end of the cross rod 210 is hinged to the sliding hinge 400, and is slidably set on the supporting foot rod 100 through the sliding hinge 400. The bottom end of the supporting foot rod 100 can be telescopically adjusted, so that when the folding chair frame is opened and folded, as the angle between the paired cross rods 210 changes, the bottom end of the cross rod 210 slides along the supporting foot rod 100, and when the folding chair frame is opened, the positions of the cross rod 210 and the supporting foot rod 100 are relatively fixed. At this time, the bottom end of the supporting foot rod 100 can still be telescopically adjusted to change the height of the supporting structure under the seat cushion, so that the height of the folding chair frame can be flexibly adjusted (for example, it can be adjusted by Figure 1 The displayed state shrinks to Fig.10 The folding chair frame provided by the utility model is shown in the state shown in the figure, which ensures the adaptability of the folding chair (for example, a folding dining chair) to complex scenes.

[0062] It can be understood that the top end of the supporting foot rod 100 can be used to fix the seat cushion. For example, when the folding chair frame includes four supporting foot rods 100, the seat cushion can be rectangular in shape, and a hole structure is set at the four corners. The seat cushion is fixed by being mounted on the top end of the four supporting foot rods 100.

[0063] As an optional implementation of the present utility model, Figures 1 to 10 As shown, the folding chair frame includes four supporting foot rods 100 and corresponding four connecting components 200, wherein the length of the tops of two adjacent supporting foot rods 100 extending beyond the fixed hinge 300 is greater than the length of the tops of the other two supporting foot rods 100 extending beyond the fixed hinge 300.

[0064] In an embodiment of the utility model, the stacking chair frame includes two supporting legs 100 with longer tops and two supporting legs 100 with shorter tops. The two supporting legs 100 with longer tops can be used to prop up the backrest, and the two supporting legs 100 with shorter tops can be used to fix auxiliary structures such as dining plates.

[0065] In order to improve the stability of the standing posture of the folding chair frame, as an optional implementation of the utility model, Figures 1 to 6As shown, a foot pad 130 is provided at the bottom end of the supporting foot bar 100, and the bottom of the foot pad 130 has a ground contact surface, and the ground contact surfaces of the bottoms of multiple foot pads 130 can be coplanar when the folding chair frame is opened.

[0066] As an optional implementation of the present invention, the material of the foot pad 130 includes plastic.

[0067] As an optional embodiment of the present invention, the bottom of the foot pad 130 has a plurality of parallel anti-skid convex strips to ensure the roughness of the bottom of the foot pad 130 and further ensure the standing stability of the folding chair frame.

[0068] As an optional implementation of the present utility model, Figures 1 to 6 As shown, the supporting foot bar 100 includes a top tube 110 and a bottom tube 120, a fixed hinge 300 is arranged on the top tube 110, and a sliding hinge 400 is slidably arranged on the bottom tube 120, and one of the top end of the bottom tube 120 and the bottom end of the top tube 110 is sleeved on the other (the figure shows that the bottom tube 120 is sleeved outside the top tube 110), and the bottom tube 120 and the top tube 110 can slide relative to each other along the extension direction of the bottom tube 120, thereby realizing the telescopic movement of the bottom end of the supporting foot bar 100.

[0069] As an optional implementation of the present utility model, Fig.10 As shown, when the folding chair frame is opened, the bottom tube 120 can slide relative to the top tube 110 until the foot pad 130 abuts against the sliding hinge 400.

[0070] It is understandable that when the bottom tube 120 is opened, it can slide until the foot pad 130 abuts against the sliding hinge 400. When the folding chair frame is folded, as the sliding hinge 400 slides downward along the supporting foot rod 100, the foot pad 130 is also driven by the sliding hinge 400 to move downward together, so that the bottom tube 120 is unfolded downward, and the supporting foot rod 100 is automatically extended when folded (such as Figure 7 , Figure 8 shown).

[0071] As an optional implementation of the present utility model, Figures 1 to 5 As shown, the portion of the top tube 110 located above the fixed hinge 300 is bent outward to form a vertical section 111, and the multiple vertical sections 111 are parallel to each other when the folding chair frame is opened.

[0072] As an optional implementation of the present utility model, Figures 1 to 5 As shown, the vertical section 111 of at least one pair of top tubes 110 is longer than that of the other top tubes 110 . The top tubes 110 with longer vertical sections 111 are used to fix the back cushion, and the top ends of the top tubes 110 with shorter vertical sections 111 are used to fix the dining tray 700 .

[0073] In order to improve the user's operating comfort, as an optional implementation of the utility model, Figures 1 to 5 As shown, a locking mechanism 140 is provided on the supporting foot bar 100, and the locking mechanism 140 can selectively lock the relative position of the top tube 110 and the bottom tube 120, so that the user can lock the relative position of the top tube 110 and the bottom tube 120 through the locking mechanism 140 after pulling the bottom tube 120 downward to ensure the stability of the height of the dining chair, and open the locking mechanism 140 when the height of the dining chair needs to be lowered, thereby allowing the supporting foot bar 100 to retract.

[0074] As an optional embodiment of the present invention, the locking mechanism 140 includes an elastic locking structure, which is arranged on one of the top tube 110 and the bottom tube 120 that is sleeved on the inner side, and has a locking opening on one of the top tube 110 and the bottom tube 120 that is sleeved on the outer side. The elastic locking structure can pop out into the locking opening when the top tube 110 and the bottom tube 120 move relative to each other until the locking opening corresponds to the position of the elastic locking structure, so as to lock the relative position of the top tube 110 and the bottom tube 120, thereby keeping the supporting leg rod 100 in an extended state, ensuring the structural stability of the folding chair frame in a high position. When it is necessary to fold up the bottom tube 120 to lower the height of the dining chair, the user only needs to press the elastic locking structure to allow the supporting leg rod 100 to retract.

[0075] In order to improve the user's operating comfort, as an optional implementation of the utility model, Figure 1 , Figure 2 As shown, the locking mechanism 140 also includes a gear adjustment component arranged on the bottom tube 120 (the figure shows that the bottom tube 120 is sleeved on the outside of the top tube 110, and the gear adjustment component is arranged on the bottom tube 120), the gear adjustment component includes a mounting sleeve 141 and an adjustment button 142, the mounting sleeve 141 is sleeved on the one of the top tube 110 and the bottom tube 120 that is sleeved on the outside, the adjustment button 142 is movably connected to the mounting sleeve 141, the position of the mounting sleeve 141 corresponds to the position of the locking opening, and the adjustment button 142 can push the elastic locking structure out of the locking opening when being pressed.

[0076] In an embodiment of the utility model, the locking mechanism 140 also includes a gear adjustment component arranged on the outer pipe fitting, and the gear adjustment component includes a mounting sleeve 141 and an adjustment button 142. When the user needs to shorten the supporting foot rod 100 to adjust the folding chair frame to a low position, the elastic locking structure can be indirectly pressed by the adjustment button 142, thereby ensuring the comfort of the user's fingers and improving the user experience.

[0077] As an optional embodiment of the utility model, a pin hole is formed on the side wall of the inner tube, and the elastic locking structure includes a spring pin and a spring, one end of the spring abuts against the inner wall of the inner tube, and the other end of the spring is connected to the first end of the spring pin, and the spring is used to drive the second end of the spring pin to extend out of the inner tube through the pin hole through elastic force.

[0078] As another optional implementation of the present invention, Fig.12 As shown, the locking mechanism 140 includes a stop bar and a stop assembly 144. The stop bar is arranged on one of the top tube 110 and the bottom tube 120 that is sleeved on the inner side, and the stop assembly 144 is arranged on one of the top tube 110 and the bottom tube 120 that is sleeved on the outer side. The stop bar includes a plurality of teeth 143 distributed along the length direction of the top tube 110. The stop assembly 144 can be selectively pressed on the plurality of teeth 143 of the stop bar to block the stop bar from passing through, thereby locking the length of the supporting foot rod 100.

[0079] As an optional implementation of the present utility model, Fig.12 As shown, the tooth portion 143 is designed so that the angle between the surface on the side facing the stretching direction and the axis of the top tube 110 is smaller than the angle between the surface on the side facing the contraction direction and the axis of the top tube 110, so that when the supporting foot rod 100 is under load, it can generate a greater friction force to prevent the supporting foot rod 100 from contracting, thereby ensuring the stability of the dining chair's usage posture.

[0080] As an optional implementation of the present utility model, Fig.12 As shown, the stop assembly 144 includes a fixing member 1441, a pressing member 1442 and a stop block 1443, the fixing member 1441 is fixedly arranged on one of the top tube 110 and the bottom tube 120 that is sleeved on the outside, the pressing member has a hinge portion 1444 and a pressing portion 1445, the hinge portion 1444 is hinged to the fixing member 1441, the stop block is arranged between the hinge portion 1444 and the stop strip, the hinge portion 1444 has a cam pressing surface 1446 on the side facing the stop block 1443, and the distance between each point on the cam pressing surface 1446 and the hinge axis of the hinge portion 1444 gradually increases along the direction approaching the pressing portion 1445.

[0081] When the length of the supporting foot rod 100 needs to be locked, Figure 13 to Figure 14As shown, the user can press the pressing portion 1445 of the pressing piece 1442 to rotate the cam pressing surface 1446 close to the pressing portion 1445 to contact the stop block 1443, thereby pressing the stop block 1443 toward the tooth portion 143, and utilizing the friction force between the stop block 1443 and the tooth portion 143 to lock the relative position between the top tube 110 and the bottom tube 120. When the height of the dining chair needs to be adjusted, it is only necessary to pull open the pressing portion 1445 to unlock the locking mechanism 140 and allow the supporting foot rod 100 to retract freely.

[0082] Optionally, the fixing member 1441 is sleeved on the one of the top tube 110 and the bottom tube 120 that is sleeved on the outside. For example, when the bottom tube 120 is sleeved outside the top tube 110, Fig.12 As shown, the fixing member 1441 is sleeved on the top of the bottom tube 120 .

[0083] In order to further ensure the stability of the folding chair frame in the open state, as an optional implementation of the utility model, Figure 1 , Figure 3 , Figure 5 , Figure 6 As shown, the folding chair frame also includes at least one support assembly 500, and the two ends of the support assembly 500 are respectively hinged to the same side of the paired cross rods 210 along the height direction, and the support assembly 500 can limit the maximum opening angle between the same side parts of the cross rods 210 along the height direction, thereby limiting the maximum opening angle of the folding chair frame.

[0084] As an optional implementation of the present utility model, Figure 1 , Figure 3 , Figure 5 , Figure 6 As shown, the support assembly 500 includes a connecting member 510 and a pair of hinged rods 520, the first ends of the hinged rods 520 are hingedly connected to the two opposite sides of the connecting member 510, and the second ends of the hinged rods 520 are hingedly connected to the cross rods 210 on both sides.

[0085] As a preferred embodiment of the present invention, Figure 3 As shown, a limiting groove is formed at the bottom of the connecting member 510, and the limiting groove runs through along its extension direction. The first ends of the hinged rods 520 on both sides are hingedly arranged in the limiting groove and can rotate in the limiting groove. When the two hinged rods 520 are in contact with the bottom surface of the limiting groove, the height of the connecting member 510 is lower than the height of the second ends of the hinged rods 520 on both sides.

[0086] In the embodiment of the utility model, the bottom of the connecting member 510 has a limiting groove. As the folding chair frame is opened, the position of the connecting member 510 falls accordingly. After the support assembly 500 is unfolded, the connecting member 510 is lowered to the lowest height. At this time, the top surface of the hinge rod 520 abuts against the end edge of the bottom surface of the limiting groove, thereby preventing the support assembly 500 from folding in the opposite direction. In addition, the connecting member 510 is naturally kept at the lowest position under the action of gravity, so that the support assembly 500 will not be automatically retracted. Only when the user actively pulls the hinge rod 520 upwards can the support assembly 500 be folded normally, and then the entire folding chair frame is folded, further ensuring the stability of the folding chair frame in the open state.

[0087] As an optional implementation of the present utility model, Figure 3 As shown, a first hinge hole is formed on both side walls at both ends of the limiting groove and penetrates to the outer surface of the connecting piece 510, and a second hinge hole is formed at the first end of the hinge rod 520 and radially penetrates the hinge rod 520. The hinge rod 520 is hingedly connected to the connecting piece 510 via a hinge axis passing through the first hinge hole and the second hinge hole.

[0088] As an optional implementation of the present utility model, Figure 1 , Figure 5 As shown, when the two hinge rods 520 are in contact with the bottom surface of the limiting groove, the vertical sections 111 of the plurality of top pipes 110 are parallel to each other.

[0089] As an optional implementation of the present utility model, Figures 1 to 5 As shown, a plurality of fixed hinges 300 are fixedly provided with folding handles 600, and the folding handles 600 are located on the outside of the corresponding top tubes 110, so that the user can drive the entire folding chair frame to fold by folding the folding handles 600 on both sides inward, thereby reducing the risk of the user being pinched when contacting the rod groups at various parts, thereby improving the user's safety and experience.

[0090] As an optional implementation of the present utility model, Figures 1 to 5 As shown, the folding handle 600 extends in the same direction as the bottom tube 120 .

[0091] As an optional implementation of the present utility model, Figures 1 to 7 , Fig. 9 , Fig.10 As shown, the folding chair frame also includes a dining tray 700, which can be fixedly connected to the top end of a portion of the supporting foot rod 100 when the folding chair frame is opened.

[0092] As an optional implementation of the present utility model, Figures 1 to 5As shown, the bottom of the dining tray 700 has a plurality of matching sleeves 710 , and when the folding chair frame is opened, the top ends of some supporting foot rods 100 can be inserted into the plurality of matching sleeves 710 one by one.

[0093] As an optional embodiment of the present invention, an elastic clamping piece is provided on the inner wall of the matching sleeve 710, such as Figure 7 As shown, the top end of the supporting foot rod 100 has a contraction portion 112 and a hemispherical portion 113, the contraction portion 112 is connected between the vertical section 111 and the hemispherical portion 113, the cross-sectional dimension of the contraction portion 112 is smaller than the cross-sectional dimension of the vertical section 111 and the maximum cross-sectional dimension of the hemispherical portion 113, and the elastic clip can enter the gap between the vertical section 111 and the hemispherical portion 113 and abut against the contraction portion 112 after the hemispherical portion 113 enters the matching sleeve 710, so as to clip and fix the top end of the supporting foot rod 100 in the matching sleeve 710, thereby ensuring the stability of the position of the dining plate 700.

[0094] In order to improve the safety of children using dining chairs, as a preferred embodiment of the present invention, Figures 1 to 5 As shown, a crotch guard frame 720 is further provided at the bottom of the dining tray 700, both ends of which are hinged to the bottom of the dining tray 700, and the crotch guard frame 720 can rotate relative to the dining tray 700 around an axis passing through the two hinges, and the center of the crotch guard frame 720 protrudes away from the dining tray 700. In the use state, the crotch guard frame 720 at the bottom of the dining tray 700 can be used to connect with the seat cushion to block the crotch of the child and prevent the child's body from sliding out of the dining chair from the bottom of the dining tray 700. Specifically, Fig.11 As shown, the crotch protector cover 721 mounted on the crotch protector frame 720 can be connected to the seat cushion via a connecting buckle 722 , and the child's legs can extend from both sides of the crotch protector frame 720 and the connecting buckle 722 .

[0095] As a second aspect of the present invention, a folding dining chair is provided. Fig.11 As shown, the folding dining chair includes a seat cushion 810, a dining tray 700 and a front folding chair frame. The seat cushion 810 is fixed on a plurality of supporting legs 100 and can be expanded when the folding chair frame is opened. The dining tray 700 can be fixedly connected to the top of some supporting legs 100 when the folding chair frame is opened.

[0096] In the folding dining chair provided by the present invention, the top end of the cross rod 210 is hinged to the fixed hinge 300 fixed on the supporting foot rod 100, and the bottom end of the cross rod 210 is hinged to the sliding hinge 400, and is slidably set on the supporting foot rod 100 through the sliding hinge 400. The bottom end of the supporting foot rod 100 can be telescopically adjusted, so that when the folding dining chair is opened and folded, as the angle between the paired cross rods 210 changes, the bottom end of the cross rod 210 slides along the supporting foot rod 100, and, when the folding chair frame is opened, the positions of the cross rod 210 and the supporting foot rod 100 are relatively fixed. At this time, the bottom end of the supporting foot rod 100 can still be telescopically adjusted to change the height of the supporting structure under the seat cushion 810, so that the height of the seat cushion 810 of the folding dining chair can be flexibly adjusted, ensuring the adaptability of the folding dining chair to complex scenes.

[0097] As an optional implementation of the present utility model, Figures 1 to 5 As shown, the bottom of the dining tray 700 has a plurality of matching sleeves 710 , and when the folding chair frame is opened, the top ends of some supporting foot rods 100 can be inserted into the plurality of matching sleeves 710 one by one.

[0098] In order to improve the safety of children using dining chairs, as a preferred embodiment of the present invention, Figures 1 to 5 As shown, a crotch guard frame 720 is also provided at the bottom of the dinner plate 700. Both ends of the crotch guard frame 720 are hinged to the bottom of the dinner plate 700, and the crotch guard frame 720 can rotate relative to the dinner plate 700 around an axis passing through the two hinges, as shown in FIG. Fig.11 As shown, the folding dining chair further includes a crotch protector 721 and a connecting buckle 722 . The crotch protector 721 is sleeved on the crotch protector frame 720 , and the connecting buckle 722 is connected between the crotch protector 721 and the seat cushion 810 .

[0099] As an optional embodiment of the present invention, the folding dining chair further includes a backrest pad 820, such as Figures 1 to 5 As shown, the support foot bar 100 includes a top tube 110 and a bottom tube 120, a fixed hinge 300 is disposed on the top tube 110, a sliding hinge 400 is slidably disposed on the bottom tube 120, and the bottom tube 120 is sleeved on the bottom end of the top tube 110 and can slide relative to the top tube 110 along the extension direction of the bottom tube 120. The portion of the top tube 110 located above the fixed hinge 300 is bent outward to form a vertical section 111, and the multiple vertical sections 111 are parallel to each other when the folding chair frame is opened, and the length of the vertical sections 111 of at least one pair of top tubes 110 is longer than the length of the vertical sections 111 of the other top tubes 110; Fig.11 As shown, the backrest cushion 820 is fixed to the top tube 110 with a longer vertical section 111, and the dining tray 700 can be fixedly connected to the top end of the top tube 110 with a shorter vertical section 111 when the folding chair frame is opened.

[0100] As an optional implementation of the present utility model, Fig.11 As shown, the back cushion 820 is connected to the seat cushion 810 as a whole.

[0101] As an optional implementation of the present utility model, Fig.11 As shown, the folding dining chair also includes a pair of guardrail pieces 830, and the two guardrail pieces 830 are respectively connected between the vertical sections 111 of the top tube 110 with a longer length on both sides and the corresponding vertical sections 111 of the top tube 110 with a shorter length. The guardrail pieces 830 can protect the left and right sides of the seat cushion 810, further improving the safety of children's dining.

[0102] As an optional implementation of the present utility model, Fig.11 As shown, the guardrail piece 830 is connected to the backrest cushion 820 as a whole.

[0103] As an optional implementation of the present utility model, Figures 1 to 5 As shown, the folding chair frame includes four supporting foot rods 100 and corresponding four connecting components 200, wherein the length of the tops of two adjacent supporting foot rods 100 extending beyond the fixed hinge 300 is greater than the length of the tops of the other two supporting foot rods 100 extending beyond the fixed hinge 300, and the dining tray 700 can be fixed on the tops of the two supporting foot rods 100 with shorter lengths when the folding chair frame is opened, and the backrest cushion can be fixed on the two supporting foot rods 100 with longer lengths when the folding chair frame is opened.

[0104] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A folding chair frame, characterized in that: The folding chair frame comprises a plurality of supporting foot rods and a plurality of connecting assemblies, wherein the plurality of connecting assemblies are connected between each two adjacent supporting foot rods in a one-to-one correspondence, and the supporting foot rods are provided with a fixed hinge and a sliding hinge, wherein the sliding hinge is located between the fixed hinge and the bottom end of the supporting foot rod, and the sliding hinge can slide along the supporting foot rod; The connecting assembly includes a pair of cross rods arranged crosswise, the cross rods are hinged to each other at the intersection, and the top ends of the cross rods are hingedly connected to the fixed hinges on the supporting foot rods on one side, and the bottom ends of the cross rods are hingedly connected to the sliding hinges on the supporting foot rods on the other side; the bottom ends of the supporting foot rods are telescopically adjustable.

2. The folding chair frame according to claim 1, characterized in that: The supporting leg rod includes a top tube and a bottom tube, the fixed hinge is arranged on the top tube, the sliding hinge is slidably arranged on the bottom tube, one of the top end of the bottom tube and the bottom end of the top tube is sleeved on the other, and the top tube and the bottom tube can slide relative to each other along the extension direction of the bottom tube.

3. The folding chair frame according to claim 2, characterized in that: The supporting foot rod is provided with a locking mechanism, and the locking mechanism can selectively lock the relative position of the top tube and the bottom tube.

4. The folding chair frame according to claim 3, characterized in that: The locking mechanism includes an elastic locking structure, which is arranged on one of the top tube and the bottom tube that is sleeved on the inner side, and one of the top tube and the bottom tube that is sleeved on the outer side has a locking opening. When the top tube and the bottom tube move relative to each other until the locking opening corresponds to the position of the elastic locking structure, the elastic locking structure can pop out into the locking opening to lock the relative position of the top tube and the bottom tube.

5. The folding chair frame according to claim 4, characterized in that: The locking mechanism also includes a gear adjustment component, which includes a mounting sleeve and an adjustment button. The mounting sleeve is mounted on one of the top tube and the bottom tube that is mounted on the outside. The adjustment button is movably connected to the mounting sleeve. The position of the mounting sleeve corresponds to the position of the locking opening, and the adjustment button can push the elastic locking structure out of the locking opening when being pressed.

6. The folding chair frame according to claim 3, characterized in that: The locking mechanism includes a stop bar and a stop assembly, the stop bar is arranged on one of the top tube and the bottom tube that is sleeved on the inner side, the stop assembly is arranged on one of the top tube and the bottom tube that is sleeved on the outer side, the stop bar includes a plurality of teeth distributed along the length direction of the top tube, and the stop assembly can be selectively pressed on the plurality of teeth of the stop bar to prevent the stop bar from passing.

7. The folding chair frame according to claim 6, characterized in that: The stop assembly includes a fixing part, a pressing part and a stop block, the fixing part is fixedly arranged on one of the top tube and the bottom tube that is sleeved on the outside, the pressing part has a hinge part and a pressing part, the hinge part is hinged to the fixing part, the stop block is arranged between the hinge part and the stop strip, the hinge part has a cam pressing surface on the side facing the stop block, and the distance between each point on the cam pressing surface and the hinge axis of the hinge part gradually increases along the direction approaching the pressing part.

8. The folding chair frame according to any one of claims 1 to 7, characterized in that: The folding chair frame also includes at least one supporting assembly, the two ends of which are respectively hinged to the same side of the paired cross rods along the height direction, and the supporting assembly can limit the maximum opening angle between the same side parts of the cross rods along the height direction.

9. The folding chair frame according to any one of claims 1 to 7, characterized in that: A folding handle is fixedly arranged on the plurality of fixed hinges.

10. A folding dining chair, characterized in that: The folding dining chair comprises a seat cushion, a dining tray and a folding chair frame as described in any one of claims 1 to 9, wherein the seat cushion is fixed on a plurality of supporting legs and can be spread out when the folding chair frame is opened, and the dining tray can be fixedly connected to the top ends of some of the supporting legs when the folding chair frame is opened.

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