Folding chair safe to use

Abstract

A folding chair safe to use, comprising a seat plate (1) and support frames symmetrically arranged on the left side and the right side of the seat plate (1). The support frames each comprise a front leg (2) and a rear leg (3); the rear legs (3) each comprise a rear leg tube (31) and a telescopic tube (32) movably inserted into the rear leg tube (31); the rear leg tubes (31) and the front legs (2) are respectively hinged to the seat plate (1); the telescopic tubes (32) are hinged to the front legs (2); when the rear legs (3) extend, the folding chair is in a folded state; and when the rear legs (3) retract, the folding chair is in an unfolded state. The folding chair further comprises locking members arranged on the rear leg tubes (31) or the joints of the front legs (2) and the telescopic tubes (32); the locking members prevent the telescopic tubes (32) from stretching out when at a locking position; and when the locking members are released, the telescopic tubes (32) extend freely. The locking members can prevent the telescopic tubes (32) from stretching out when at a locking position, such that the folding chair can be locked in a support state, thereby preventing unintended folding of the folding chair when in use, and improving use safety.

Description

A folding chair that is safe to use

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority based on the Chinese patent application filed with the State Intellectual Property Office of China on March 27, 2024, with application number: 2024206065545, and the name of the invention: "A safe folding chair". The content of the Chinese patent application is hereby introduced into the text of this application. Technical Field

[0003] The present application relates to a folding chair, and in particular to a mechanism for restricting the folding of the folding chair. Background Art

[0004] The folding chair comprises hinged front legs, rear legs and a seat plate. The front legs and rear legs can be rotated relative to each other to drive the folding chair to be opened and folded at will, and the chair is easy to store and use.

[0005] Traditional folding chairs limit the degree of opening of the folding chairs by setting a gear structure in the rear leg tubes, but do not lock the open state. As a result, the traditional folding chairs may fold in the open state without the user's intention, and the safety of users, especially children, needs to be improved. Summary of the Invention

[0006] The purpose of this application is to overcome the defects of the prior art and provide a folding chair that is safe to use.

[0007] The technical solution of this application is as follows:

[0008] A folding chair that is safe to use comprises a seat plate and support frames symmetrically arranged on the left and right sides of the seat plate, the support frames comprising front legs and rear legs, the rear legs comprising rear leg tubes and telescopic tubes movably plugged into the rear leg tubes, the rear leg tubes and the front legs being hinged to the seat plate respectively, the telescopic tubes being hinged to the front legs, the folding chair being in a folded state when the rear legs are extended, and being in an open state when the rear legs are retracted, the support frames further comprising locking members arranged at the connection between the rear leg tubes or the front legs and the telescopic tubes, which prevent the telescopic tubes from extending in the locked position, and which allow the telescopic tubes to extend freely when the locking members are released.

[0009] In some possible implementations, the locking member further includes a rotating arm, the fulcrum of the rotating arm being pivotally connected to the connection between the telescopic tube and the front leg, one end of the rotating arm being a pressing end, the other end of the rotating arm being a free end, the locking member being disposed at the free end, the free end being provided with a clamping sub-member, and the tube wall of the rear leg tube being provided with a clamping female member;

[0010] When the rear legs are retracted, the clamping sub-component is clamped with the clamping female component at its locking position, and the folding chair is locked in the opened state.

[0011] In some possible implementations, the folding chair further includes a torsion spring, wherein a spring body of the torsion spring is sleeved on a fulcrum at which the rotating arm is pivoted, one torsion arm of the torsion spring is fixedly disposed on the telescopic tube, the front leg, or the connection between the telescopic tube and the front leg, and the other torsion arm of the torsion spring abuts against a pressing end of the rotating arm;

[0012] When the folding chair is in the folded state, the torsion spring is in a free state.

[0013] In some possible implementations, the front leg is hinged to the telescopic tube via a hinge, and the rotating arm is pivotally connected to the connection between the telescopic tube and the front leg.

[0014] In some possible implementations, the locking member includes a latch, the rear leg tube defines a first latch hole, and the telescopic tube defines a second latch hole;

[0015] When the rear legs are retracted, the first latch hole overlaps with the second latch hole, and the latch pin is engaged with the first latch hole and the second latch hole at the same time in its locking position, and the folding chair is locked in the opened state.

[0016] In some possible implementations, the bottom end of the telescopic tube has a guiding slope that gradually moves away from the central axis of the telescopic tube from bottom to top.

[0017] In some possible implementations, the locking member further includes a rotating arm and an elastic member, wherein the fulcrum of the rotating arm is pivotally connected to the rear leg tube, one end of the rotating arm is a free end, and the bayonet is connected to the free end; the end of the rotating arm away from the bayonet is a pressing end, and the elastic member abuts between the pressing end and the rear leg tube, and the elastic member is a spring;

[0018] When the latch is in the locking position, the elastic member is in a free state.

[0019] In some possible implementations, the rotating arm is hinged to the rear leg tube, and the outer wall of the rear leg tube is provided with a limiting groove corresponding to the position of the pressing end. When the pressing end is engaged with the limiting groove, the engaging component is at its farthest position from the rear leg tube or the telescopic tube.

[0020] In some possible implementations, the rear leg tube further includes a tube wall fixedly inserted into the rear leg tube, and the length of the fixing rivet inserted into the rear leg tube is greater than the distance between the inner wall of the rear leg tube and the outer wall of the telescopic tube;

[0021] When the rear legs are retracted, the bottom of the telescopic tube abuts against the fixing rivet.

[0022] The present application has at least the following beneficial effects: the locking member can prevent the telescopic tube from extending in its locking position, thereby locking the folding chair in an open state, preventing the folding chair from accidentally folding during use, and improving safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a folding chair provided in Example 1 in a supported state;

[0024] FIG2 is a schematic structural diagram of the folding chair provided in Example 1 in a folded state;

[0025] FIG3 is a left side view of the folding chair provided in Example 1 in the open state, wherein the locking member is in the locked position;

[0026] FIG4 is an enlarged view of B in FIG3 ;

[0027] FIG5 is a cross-sectional view of FIG4;

[0028] FIG6 is a left side view of the folding chair provided in Example 1 in the open state, wherein the locking member is released at this time;

[0029] FIG7 is an enlarged view of C in FIG6 ;

[0030] FIG8 is a cross-sectional view of FIG7;

[0031] Figure 9 is an enlarged view of A in Figure 2;

[0032] FIG10 is a cross-sectional view of FIG9;

[0033] FIG11 is a schematic structural diagram of the folding chair provided in Example 2 in a supported state;

[0034] FIG12 is a schematic structural diagram of the folding chair provided in Example 2 in a folded state;

[0035] FIG13 is a right side view of the structure shown in FIG12;

[0036] FIG14 is a cross-sectional view of D in FIG12;

[0037] FIG15 is a schematic structural diagram of the folding chair provided in Example 2 during the opening process, wherein the guide slope abuts against the latch at this time;

[0038] FIG16 is a right side view of the structure shown in FIG15;

[0039] FIG17 is a cross-sectional view of E in FIG15 ;

[0040] FIG18 is a schematic structural diagram of the folding chair provided in Example 2 in a supported state;

[0041] FIG19 is a right side view of the structure shown in FIG18;

[0042] FIG20 is a cross-sectional view of F in FIG18 ;

[0043] FIG. 21 is a schematic diagram showing the locking member in FIG. 20 being released.

[0044] The reference numerals in the figure are: 1-seat plate; 2-front leg; 21-hinge; 3-rear leg; 31-rear leg tube; 311-limiting groove; 312-fixing rivet; 313-first clamping hole; 32-telescopic tube; 321-guide slope; 322-second clamping hole; 33-clamping mother part; 41-rotating arm; 411-pressing end; 42-clamping sub-part; 43-pin; 5-torsion spring; 51-spring body; 52-torsion arm; 6-elastic part. DETAILED DESCRIPTION

[0045] The technical solution of this application is further illustrated and described below through specific implementation methods. The "contraction" of the rear legs mentioned in this application refers to the state in which the connection length of the rear leg tube and the telescopic tube is maximized and the total length of the rear legs is minimized. Conversely, "extension" refers to the state in which the connection length of the rear leg tube and the telescopic tube is minimized. Accordingly, when the rear legs are "contracted," the angle between the front legs and the rear legs is maximized, and the folding chair is in the "open" state. When the rear legs are "extended," the angle between the front legs and the rear legs is minimized, and the legs are nearly parallel, and the folding chair is in the "folded" state.

[0046] Example 1

[0047] As shown in Figures 1 and 2, this embodiment provides a folding chair with a locking member, including a seat plate 1 and a support frame symmetrically arranged on the left and right sides of the seat plate 1, the support frame including a front leg 2 and a rear leg 3, the rear leg 3 including a rear leg tube 31 and a telescopic tube 32 movably inserted into the rear leg tube 31, the rear leg tube 31 and the front leg 2 are respectively hinged to the seat plate 1, the front leg 2 is provided with a hinge 21, the telescopic tube 32 is hinged to the hinge 21 of the front leg 2, the folding chair is in a folded state when the rear leg 3 is extended, and the folding chair is in a supported state when the rear leg 3 is retracted.

[0048] 3 and 4 , the folding chair further comprises a locking member. In this embodiment, the locking member comprises a rotating arm 41 and a snap-fitting member 42. The fulcrum of the rotating arm 41, the telescopic tube 32, and the hinge 21 are hingedly connected. One end of the rotating arm 41 is a pressing end 411, and the other end of the rotating arm 41 is a free end. The snap-fitting member 42 is disposed at the free end of the rotating arm 41. A snap-fitting member 34 is disposed at a corresponding position on the rear leg tube 31. The snap-fitting member 34 is a slot. When the rear leg 3 is retracted, the locking member is locked into position by the snap-fitting member 42 engaging with the snap-fitting member 34. Pressing the pressing end 411 can cause the rotating arm to rotate relative to the rear leg, causing the snap-fitting member 42 to engage or disengage with the snap-fitting member 34.

[0049] In addition, as shown in Figure 5 , the locking member further includes a torsion spring 5. Specifically, the torsion spring 5 includes a spring body 51 and two torsion arms 52 located at both ends of the spring body 51. The spring body 51 is mounted on the pivot point of the rotating arm 41, one torsion arm 52 is fixed to the hinge 21 of the front leg 2, and the other torsion arm 52 abuts against the pressing end 411 of the rotating arm 41.

[0050] The structure of the folding chair will be further described below in conjunction with the state changes of the folding chair.

[0051] When the folding chair is in the supported position, as shown in Figures 3-5, the telescopic tube 32 and the rear leg tube 31 are in the retracted position. At this point, their overlapping length is at its maximum, and the total length of the rear legs 3 is at its minimum. The clamping member 42 is engaged with the clamping mother member 34, and the two torsion arms 52 of the torsion spring 5 press against each other, generating a force pulling them apart. This force, transmitted through the pivoting arm 41, presses the free end of the pivoting arm 41 toward the clamping mother member 34, further stabilizing the connection between the clamping mother member 34 and the clamping member 42. The folding chair is locked in the folded position.

[0052] Pressing the pressing end 411 releases the engagement between the latching member 42 and the female latching member 34, releasing the locking member as shown in Figures 6-8. The rear leg 3 then rotates toward the front leg 2, and the telescopic tube 32 slides relative to the rear leg tube 31 until the extended state is reached, as shown in Figures 2, 9, and 10. At this point, as can be seen in Figure 10, the torsion spring 5 is undeformed, making the folded state relatively stable. External force is required to open the folding chair.

[0053] Example 2

[0054] This embodiment provides a folding chair with a locking member, as shown in Figure 11, the folding chair includes a seat plate 1 and a support frame 2 symmetrically arranged on the left and right sides of the seat plate 1, the support frame 2 includes a front leg 2 and a rear leg 3, the rear leg 3 includes a rear leg tube 31 and a telescopic tube 32 movably inserted into the rear leg tube 31, the rear leg tube 31 and the front leg 2 are respectively hinged to the seat plate 1, the front leg 2 is provided with a hinge 21, the telescopic tube 32 is hinged to the hinge 21 of the front leg 2, when the rear leg 3 is extended, the folding chair is in a folded state as shown in Figure 12, and when the rear leg 3 is retracted, the folding chair is in a supported state as shown in Figures 11 and 18.

[0055] The folding chair has a locking member on the rear leg tube 31. As shown in Figure 14, the locking member includes a pivot arm 41 and a latch 43. A first latch hole 313 is defined in a corresponding position on the rear leg tube 31, and a second latch hole 322 is defined in a corresponding position on the telescopic tube 32. The pivot arm 41 is pivotally connected to the rear leg tube at its fulcrum. One end of the pivot arm 41 is free and connected to the latch 43.

[0056] The rear leg tube 31 further includes a fixing rivet 312 , which is fixedly inserted into the tube wall of the rear leg tube 31 and passes through the rear leg tube 31 . When the folding chair is in the supporting state, the bottom end of the telescopic tube 32 abuts against the fixing rivet 312 .

[0057] The other end of the rotating arm 41 away from the pin 43 is a pressing end 411. A limiting groove 311 corresponding to the position of the pressing end 411 is provided on the rear leg tube 31. A compression spring 6 is provided near the limiting groove 311. One end of the compression spring 6 abuts against the rear leg tube 31, and the other end of the compression spring 6 abuts against the pressing end 411. When the pressing end 411 is away from the rear leg tube 31, the compression spring 6 is at its original length. When the pressing end 411 is engaged with the limiting groove 311, the compression spring 6 is in a compressed state as shown in Figure 21.

[0058] The bottom end of the telescopic tube 32 has a guiding slope 321 that gradually moves away from the central axis of the telescopic tube 32 from bottom to top. When the telescopic tube 32 slides downward, as shown in Figure 17, the guiding slope 321 contacts the latch 43, driving the latch 43 to move in a direction away from the rear leg tube 31.

[0059] The structure of the folding chair will be further described below in conjunction with the state changes of the folding chair.

[0060] Referring to Figures 12-14 , when the folding chair is in the folded position, the latch 43 engages the rear leg tube 31, with the pressing end 411 away from the retaining groove 311. Rotating the rear leg 3 away from the front leg 2 increases the length of the extension tube 32 connected to the rear leg tube 31 until the chair reaches the retracted position. During this process, as shown in Figures 15-17 , the extension tube 32 first contacts the latch 43. The latch 43, under the pressure of the guide ramp 321, drives the free end of the pivot arm 41 to rotate away from the rear leg tube 31, allowing the latch 43 to remain partially within the rear leg tube 31. As shown in Figures 18 to 20, when the rear leg 3 reaches the retracted state, the bottom end of the telescopic tube 32 abuts against the fixing rivet 312, the first opening 313 of the rear leg tube 31 and the second opening 322 of the telescopic tube 32 coincide with each other, and the bayonet 43 passes through the first opening 313 and the second opening 322 at the same time, so that the relative positions of the rear leg tube 31 and the telescopic tube 32 are fixed, and the folding chair is locked in the supporting state.

[0061] As shown in FIG. 21 , to release the locking member, one only needs to press the pressing end 411 to move the latch 43 away from the second opening 322 .

[0062] The above are merely preferred embodiments of the present application, and therefore cannot be used to limit the scope of implementation of the present application. That is, equivalent changes and modifications made according to the patent scope of the present application and the contents of the specification should still fall within the scope covered by the present application. Industrial Applicability

[0063] The present application discloses a safe folding chair, comprising a seat plate and support frames symmetrically arranged on the left and right sides of the seat plate, the support frames comprising front legs and rear legs, the rear legs comprising rear leg tubes and telescopic tubes movably plugged into the rear leg tubes, the rear leg tubes and the front legs being hinged to the seat plate respectively, the telescopic tubes being hinged to the front legs, the folding chair being in a folded state when the rear legs are extended, and being in an open state when the rear legs are retracted, the folding chair further comprising a locking member arranged at the connection between the rear leg tubes or the front legs and the telescopic tubes, which prevents the telescopic tubes from extending in a locked position, and which allows the telescopic tubes to extend freely when the locking member is released. The locking member, in its locked position, can prevent the telescopic tubes from extending, thereby locking the folding chair in a supported state, preventing the folding chair from accidentally folding during use, improving safety in use, and having industrial applicability.

Claims

1. A safe folding chair, comprising a seat and support frames symmetrically arranged on the left and right sides of the seat, the support frames comprising front legs and rear legs, the rear legs comprising rear leg tubes and telescopic tubes movably plugged into the rear leg tubes, the rear leg tubes and the front legs being hinged to the seat respectively, the telescopic tubes being hinged to the front legs, the folding chair being in a folded state when the rear legs are extended, and being in an open state when the rear legs are retracted, characterized in that: It also includes a locking piece provided at the connection between the rear leg tube or the front leg and the telescopic tube, which prevents the telescopic tube from extending when in the locked position; when the locking piece is released, the telescopic tube extends freely.

2. The folding chair according to claim 1, wherein: The locking member further includes a rotating arm, the fulcrum of which is pivotally connected to the connection between the telescopic tube and the front leg, one end of the rotating arm is a pressing end, and the other end of the rotating arm is a free end, the free end is provided with a clamping sub-member, and the tube wall of the rear leg tube is provided with a clamping female member; When the rear legs are retracted, the clamping sub-part is clamped with the clamping female part at its locking position, and the folding chair is locked in the opened state.

3. The folding chair according to claim 2, wherein: The locking member further comprises a torsion spring, the main body of the torsion spring being sleeved on the pivot point of the rotating arm, one torsion arm of the torsion spring being fixedly disposed on the telescopic tube, the front leg, or the connection between the telescopic tube and the front leg, and the other torsion arm of the torsion spring being against the pressing end of the rotating arm; When the folding chair is in the folded state, the torsion spring is in a free state.

4. The folding chair according to claim 3, wherein: The front legs are hinged to the telescopic tube via hinges, and the rotating arm is pivotally connected to the connection between the telescopic tube and the front legs.

5. The folding chair according to claim 1, wherein: The locking member includes a bayonet, the rear leg tube is provided with a first bayonet hole, and the telescopic tube is provided with a second bayonet hole; When the rear legs are retracted, the first latch hole and the second latch hole overlap, and the latch pin is engaged with the first latch hole and the second latch hole at the same time in its locking position, and the folding chair is locked in the opened state.

6. The folding chair according to claim 5, wherein: The bottom end of the telescopic tube has a guiding slope which gradually moves away from the central axis of the telescopic tube from bottom to top.

7. The folding chair according to claim 5 or 6, characterized in that: The locking member further comprises a rotating arm and an elastic member, wherein the fulcrum of the rotating arm is pivotally connected to the rear leg tube, one end of the rotating arm is a free end, and the bayonet is connected to the free end; the end of the rotating arm away from the bayonet is a pressing end, and the elastic member abuts between the pressing end and the rear leg tube, and the elastic member is a spring; When the latch is in the locking position, the elastic member is in a free state.

8. The folding chair according to claim 7, wherein: The rotating arm is hinged to the rear leg tube, and the outer wall of the rear leg tube is provided with a limiting groove corresponding to the position of the pressing end. When the pressing end is engaged with the limiting groove, the engaging component is at its farthest position from the rear leg tube or the telescopic tube.

9. The folding chair according to claim 1, wherein: The rear leg tube also includes a tube wall fixedly inserted into the rear leg tube, and the length of the fixing rivet inserted into the rear leg tube is greater than the distance between the inner wall of the rear leg tube and the outer wall of the telescopic tube; When the rear legs are retracted, the bottom of the telescopic tube abuts against the fixing rivet.

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