Anti-toppling sofa

Abstract

The invention discloses an anti-toppling sofa which comprises two armrests which are bilaterally symmetrical and a mechanical stretching device which is arranged between the two armrests and can be subjected to state conversion, and forward moving supporting assemblies which are independent of the mechanical stretching device and can be matched with the mechanical stretching devices of different structures are mounted on the inner sides of the armrests. The linkage piece on the mechanical stretching device is in linkage connection with the main sliding piece, and when the mechanical stretching device changes the state, the supporting rods sequentially move forwards and are rotationally opened, so that the contact positions of the supporting rods and the ground are closer to the front, the sofa adapts to the change of the gravity center position of the sofa, and the stability and the safety of the sofa are improved.

Description

Technical Field

[0001] The present invention relates to the field of furniture, in particular to an anti-tipping sofa. Background Art

[0002] Compared with traditional sofas with single functions, multifunctional sofas have been popular in recent years. The multifunctional sofa includes two armrests and a mechanical extension device located between the two armrests. The mechanical extension device includes a seat assembly, a backrest assembly, and a leg rest assembly. When the mechanical extension device is extended, the sofa can switch to different postures to meet the needs of the user; for example, when the multifunctional sofa switches its posture, the leg rest assembly will open forward, but the forward rotation of the leg rest assembly will cause the center of gravity of the sofa to move forward. At the same time, the legs of the occupant are supported on the leg rest assembly, making the sofa prone to tilting forward, affecting the safety of the sofa and user experience.

[0003] In the sofa patent previously designed by the applicant with publication number CN117582085, a movable support component independent of the mechanical extension component is provided on the sofa armrest. The movable support component is modularly designed, so that the movable support component can be adapted to most multifunctional sofas without being affected by the structure of the mechanical extension component. The movable support component includes a mounting seat, a movable component that moves along the mounting seat, and a support leg that is linked to the movable component; a gear is rotatably connected to the mounting seat, and the gear and the upper part of the support leg remain relatively fixed in the circumferential direction. One end of the movable component is provided with a rack that engages with the gear transmission. After being triggered, the movable component moves along the mounting seat and drives the gear to rotate, so that the support leg opens in the direction of supporting the ground; after the leg support assembly is opened, the support rod contacts the ground to prevent the sofa from tilting forward.

[0004] However, the supporting position of the rotated supporting legs is affected by the rotation radius, resulting in the contact position of the rotated supporting legs with the ground not being close enough to the front, affecting the stability of the sofa. Summary of the Invention

[0005] The present invention provides an anti-tipping sofa. A forward support assembly is installed on the inner side of an armrest, which is independent of a mechanical extension device and can be adapted to mechanical extension devices of different structures. A linkage member on the mechanical extension device is linked to a main sliding member. When the mechanical extension device changes state, the support rods are sequentially moved forward and rotated open, so that the contact position between the support rods and the ground is moved further forward, adapting to changes in the center of gravity of the sofa and improving the stability and safety of the sofa.

[0006] The technical solution of the present invention is achieved as follows: An anti-tilt sofa comprises two symmetrical armrests and a mechanical extension device disposed between the two armrests and capable of changing state. A forward movement support assembly independent of the mechanical extension device is mounted on the inner side of at least one armrest. The forward movement support assembly comprises a base, to which the forward movement assembly is connected for forward and backward sliding movement. The forward movement assembly comprises a main slider and a secondary slider. A support rod capable of forward and backward rotation is linked between the main slider and the secondary slider. When the main slider and the secondary slider produce relative displacement, the support rod can be linked to rotate forward and backward. The mechanical extension device is provided with a linkage member capable of linking the main slider to move forward and backward. When the mechanical extension device changes its state, it drives the linkage part to move and acts on the main sliding part, causing the forward moving component to slide forward and drive the support rod forward. When the support rod moves forward into position, the auxiliary sliding part stays in the predetermined position. At this time, the main sliding part continues to slide forward and links the support rod that has moved forward into position to rotate forward and open.

[0007] Preferably, the mechanical stretching device includes a leg rest assembly connected to the linkage member. When the leg rest assembly opens forward, it drives the linkage rod to move and act on the main sliding member, so that the leg rest assembly forms a linkage with the linkage rod when it opens.

[0008] Preferably, the mechanical extension device also includes a seat support assembly, the seat support assembly includes a seat support plate, the leg support assembly includes a leg support plate, and a mechanical extension assembly composed of a plurality of connecting rods that are connected to each other is connected below the leg support plate and the seat support plate, and the linkage is connected to one of the connecting rods close to the main sliding member; when the mechanical extension assembly is actuated, the linkage follows the connecting rod connected to it and moves forward to apply a forward force to the main sliding member.

[0009] Preferably, the mechanical extension device has an extended state and a retracted state. When the mechanical extension device switches from the retracted state to the extended state, the support rod moves forward to its position and rotates forward to open; when the mechanical extension device switches from the extended state to the retracted state, the linkage part moves and acts on the main sliding part, causing the forward moving component and the support rod to slide backward. When the auxiliary sliding part resets backward and stops at the initial position, the main sliding part continues to slide backward and links the support rod to rotate backward and retract.

[0010] Preferably, the auxiliary sliding member is slidably connected to the support rod, the auxiliary sliding member is provided with a connecting member, the support rod is provided with a sliding groove extending along its own length direction, the connecting member and the sliding groove form a sliding connection, and the connecting member has sliding resistance when sliding in the sliding groove; When the support rod moves forward, the support rod and the connecting piece remain relatively fixed, so that the forward moving assembly slides forward and drives the support rod forward at the same time; when the auxiliary sliding piece slides to a predetermined position, the main sliding piece slides forward relative to the auxiliary sliding piece, and forces the support rod in the forward moving state to overcome the sliding resistance and then rotate forward and switch to the open state; the sliding resistance generated by the connecting piece and the slide groove prevents the main sliding piece from moving relative to the auxiliary sliding piece when the support rod has not moved forward into position, so that the forward moving assembly can slide forward as a whole and drive the support rod forward, and when the auxiliary sliding piece stops sliding forward, the main sliding piece produces a forward displacement relative to the auxiliary sliding piece, and at this time the sliding resistance is overcome, so that the support rod can rotate and open smoothly.

[0011] Preferably, the main sliding member is rotationally connected or slidingly connected to the support rod.

[0012] Preferably, the main sliding member and the support rod are slidably connected; a guide pin is provided on one of the main sliding member and the support rod, and a first guide groove is provided on the other of the main sliding member and the support rod, the first guide groove extends in the vertical direction, and the guide pin is slidably connected in the first guide groove; a linkage relationship is established between the support rod and the main sliding member, and at the same time, the vertical first guide groove also conforms to the position change in the vertical direction when the support rod rotates, so that the support rod can smoothly rotate forward and open.

[0013] Preferably, the auxiliary sliding member is provided with a second guide groove extending in the front-to-back direction, and the guide pin is slidably connected in the second guide groove; the guide pin, the first guide groove and the second guide groove constitute a guiding structure, and the guide pin slides in the first guide groove and the second guide groove to guide the support rod to rotate forward and open; making the support rod rotate and open more smoothly.

[0014] Preferably, the front end of the second guide groove extends obliquely downward and forms a locking groove. When the support rod rotates forward and opens into place, the guide pin slides into the locking groove, preventing the support rod from rotating in the opposite direction after it is rotated and opened, thereby ensuring the stability of the sofa.

[0015] Preferably, the connecting member is rotatably connected to the auxiliary sliding member, and the connecting member is provided with a matching portion that matches the width of the slide groove, and the cross-sectional shape of the matching portion is non-circular. The matching portion is slidably connected in the slide groove, so that the support rod can rotate forward relative to the auxiliary sliding member.

[0016] Preferably, a rotating support shaft is provided between the connecting member and the auxiliary sliding member, the rotating support shaft extends out of the slide groove and forms a passing section, and an adjusting nut is threadedly connected to the passing section. The adjusting nut is rotated to make the connecting member contact and rub against the support rod, so that the connecting member has sliding resistance when sliding in the slide groove; the threaded adjustment nut can force the connecting member to contact with the support rod and generate sliding friction. At the same time, the threaded connection method also facilitates the adjustment of the magnitude of the sliding friction.

[0017] Preferably, an outwardly protruding push portion is provided on the outer side surface of the main sliding member, and the linkage member acts on the push portion so as to facilitate linkage with the leg support assembly of the sofa.

[0018] Preferably, a limiting structure is provided between the base and the auxiliary sliding member, the limiting structure including a limiting surface provided on the base, and a limiting block facing the limiting surface is provided on the auxiliary sliding member, and when the forward moving component drives the support rod position to move forward, the limiting block approaches the limiting surface; when the support rod moves forward to its position, the limiting block abuts against the limiting surface to prevent the auxiliary sliding member that has slid forward to a predetermined position from continuing to slide forward.

[0019] Preferably, the main sliding member and the auxiliary sliding member are arranged side by side and slidably connected to the base; the structure of the forward moving support assembly is optimized, and the space occupied by the forward moving assembly on the base is saved.

[0020] The beneficial effects of the present invention using the above technical solution are: The present invention installs a forward support assembly on the inner side of the armrest that is independent of the mechanical extension device and can be adapted to mechanical extension devices of different structures, and makes the linkage member on the mechanical extension device form a linkage connection with the main sliding member. When the mechanical extension device changes state, the support rods are moved forward and rotated open in sequence, so that the contact position of the support rods with the ground is moved further forward, adapting to the change of the center of gravity position of the sofa, and improving the stability and safety of the sofa.

[0021] The main reason for the poor stability of the sofa is that when the leg rest assembly is opened forward, the center of gravity of the sofa will move forward. Therefore, the present invention forms a transmission connection between the linkage member and the leg rest assembly to ensure that the support rod can be linked synchronously in time when the leg rest assembly is opened forward, thereby further ensuring the stability of the sofa.

[0022] In order to enable the support rod to switch to the forward state and the open state in sequence, a sliding connection structure is set between the auxiliary sliding member and the support rod, so that the support rod can slide with resistance relative to the auxiliary sliding member. The existence of this resistance prevents the main sliding member and the auxiliary sliding member from sliding relative to each other when the support rod moves forward. When the support rod moves forward into place and the auxiliary sliding member stops sliding forward, the sliding resistance can be overcome while the main sliding member continues to move forward, thereby linking the forward-moving support rod to rotate forward. The structure is simple and the design is ingenious.

[0023] In the sliding connection structure, an adjusting nut is provided to be threadedly connected to the protruding section of the rotating support shaft. While ensuring the sliding resistance between the auxiliary sliding part and the support rod, the seated person can adjust the size of the sliding friction force by rotating the adjusting nut according to needs, avoiding the phenomenon that the support rod is difficult to rotate and open due to excessive sliding friction, and the support rod is opened prematurely due to insufficient friction, thereby ensuring that the forward support assembly can work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the forward support assembly in the initial state; Figure 2 This is an exploded view of the forward support assembly; Figure 3 Schematic diagram of the forward support assembly structure in the initial state at another angle; Figure 4 This is a schematic diagram of the structure of the forward support assembly when the support rod is opened; Figure 5 This is a schematic diagram of the forward support assembly structure when the support rod is opened at another angle; Figure 6 is a cross-sectional view of the sliding connection between the auxiliary sliding member and the support rod; Figure 7 is a cross-sectional view showing the position of the guide pin; Figure 8 This is a schematic diagram of the forward support assembly being installed on the inner side of a sofa armrest; Figure 9 This is a schematic diagram of the leg support assembly of the sofa being opened, with the support rod rotating forward to open; Figure 10 Schematic diagram of the sliding connection structure in Example 2; The figures are marked as follows: 1-base, 2-secondary sliding member, 3-main sliding member, 4-support rod, 5-rotation support shaft, 6-guide pin, 7-linkage member, 8-armrest, 9-leg support assembly, 10-mechanical extension device, 11-guide member, 12-guide channel, 13-avoidance groove, 14-limiting surface, 21-second guide groove, 22-locking groove, 23-extension part, 24-limiting member, 31-first guide groove, 32-pushing part, 41-slide groove, 42-sheath, 51-connecting member, 511-matching part, 52-washer, 53-elastic pad, 54-adjusting nut, 61-spacer, 62-gasket, 63-connecting nut, 71-linkage groove. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] The present invention has multiple embodiments, and the specific implementation methods are as follows: Example 1: Figure 1-9 As shown, this embodiment provides an anti-tilt sofa, comprising two left-right symmetrical armrests 8 and a mechanical extension device 10 arranged between the two armrests 8 and capable of state transformation. A forward support assembly independent of the mechanical extension device 10 is installed on the inner side of at least one armrest 8. The forward support assembly comprises a base 1, which is usually mounted on the inner side of the armrest 1 by screws; a forward assembly is connected to the base 1 for forward and backward sliding, and the forward assembly comprises a main sliding member 3 and a secondary sliding member 2. A support rod 4 that can rotate forward and backward is linked between the main sliding member 3 and the secondary sliding member 2. Specifically, in this embodiment, the support A sheath 42 is connected to the bottom end of the rod 4 to prevent wear; the base 1, main slider 3, and auxiliary slider 2 are all made of metal plates. Two upper and lower rows of guide members 11 are installed on the base 1. The guide members 11 are screws locked to the base 1. The multiple guide members 11 in each row are spaced apart from each other, and a guide channel 12 is formed between the upper and lower rows of guide members 11. The main slider 3 and auxiliary slider 2 are slidably connected in the guide channel 12. When the main slider 3 and auxiliary slider 2 produce relative displacement, they can be linked to the support rod 4 to rotate forward and backward. The mechanical extension device 10 is provided with a linkage member 7 that can be linked to the forward and backward movement of the main slider 3. When the mechanical stretching device 10 changes its state, it drives the linkage part 7 to move and act on the main sliding part 3, causing the forward moving component to slide forward and drive the support rod 4 to move forward. When the support rod 4 moves forward into place, the auxiliary sliding part 2 stays in the predetermined position. At this time, the main sliding part 3 continues to slide forward and links the support rod 4 that has moved forward into place to rotate forward and open.

[0028] Further, if Figure 8-9 As shown, the mechanical extension device 10 includes a leg support assembly 9. The sofa is easy to overturn and tilt forward mainly because the center of gravity of the entire sofa will move forward after the leg support assembly 9 is opened. Therefore, in this embodiment, the linkage member 7 is connected to the leg support assembly 9 through a transmission. When the leg support assembly 9 is opened forward, the linkage rod 7 is driven to move and act on the main sliding member 3; the leg support assembly 9 forms a linkage with the linkage rod 7 when it is opened; specifically, in the initial state, the leg support plate tends to be in a vertical retracted state; when the leg support assembly 9 is opened forward, the leg support plate gradually tends to be horizontal, and the center of gravity position of the entire sofa moves forward. At this time, the linkage member 7 links the main sliding member 3 through the pushing portion 32, so that the support rod 4 gradually switches to the forward state and the open state. At this time, the support rod 4 is opened in a more forward state and supported on the ground, which effectively prevents the instability caused by the forward movement of the center of gravity of the sofa, and enables the forward support assembly to adapt to the change of the center of gravity position of the sofa, thereby improving the stability of the sofa.

[0029] Furthermore, the leg support assembly 9 and the linkage 7 form a transmission connection through a mechanical extension assembly. Specifically, the mechanical extension device 10 also includes a seat support assembly, the seat support assembly includes a seat support plate, the leg support assembly includes a leg support plate, and the leg support plate and the seat support plate are connected below with a mechanical extension assembly composed of multiple connecting rods that are transmission-connected to each other. The mechanical extension assembly is formed by hinged multiple connecting rods, which is an existing conventional mechanism and its specific structure will not be repeated; the linkage 7 is connected to one of the connecting rods close to the main sliding member 3; when the mechanical extension assembly is actuated, the leg support assembly 9 gradually opens forward, and the linkage 7 moves forward following the connecting rod connected thereto to apply a forward force to the main sliding member 3.

[0030] Furthermore, the mechanical stretching device 10 has an extended state and a retracted state, and the process of switching between the extended state and the retracted state is as follows: when the mechanical stretching device 10 switches from the retracted state to the extended state, the support rod 4 moves forward to its position and rotates forward to open; when the mechanical stretching device 10 switches from the extended state to the retracted state, the linkage 7 moves and acts on the main sliding member 3, causing the forward moving assembly and the support rod 4 to slide backward. When the auxiliary sliding member 2 resets backward and stops at the initial position, the main sliding member 3 continues to slide backward and links the support rod 4 to rotate backward and retract.

[0031] Furthermore, in order to enable the support rod 4 to smoothly move forward to its proper position and open forward, Figure 6 As shown, a sliding connection structure is provided between the auxiliary sliding member 2 and the support rod 4, the sliding connection structure including a connecting member 51 connected to the auxiliary sliding member 2, a slide groove 41 extending along the length direction of the support rod 4, the connecting member 51 and the slide groove 41 form a sliding connection, and the connecting member 51 has sliding resistance when sliding in the slide groove 41; When the support rod 4 moves forward, the support rod 4 and the connecting member 51 remain relatively fixed, so that the forward moving assembly slides forward and drives the support rod 4 forward at the same time; when the auxiliary sliding member 2 slides to a predetermined position, the main sliding member 3 slides forward relative to the auxiliary sliding member 2, and forces the support rod 4 in the forward state to overcome the sliding resistance and rotate forward and switch to the open state; the sliding resistance generated by the connecting member 51 and the sliding groove 41 prevents the main sliding member 3 from moving relative to the auxiliary sliding member 2 when the support rod 4 has not moved forward to its full position, so that the forward moving assembly as a whole can slide forward and drive the support rod 4 forward When the auxiliary sliding member 2 stops sliding forward, the main sliding member 3 produces a forward displacement relative to the auxiliary sliding member 2. At this time, the sliding resistance is overcome, allowing the support rod 4 to rotate open smoothly. The design is simple and ingenious, so that the support rod 4 can be rotated open and supported on the ground after moving forward; while the support rod 4 rotates forward, it will first slide along its own length and away from the ground to prevent the support rod 4 from interfering with the ground; as the support rod 4 continues to rotate forward, the support rod 4 will slide along its own length again and gradually approach the ground until the support rod 4 is opened into place and supported on the ground.

[0032] Further, in order to enable the support rod 4 to be connected between the main sliding member 3 and the auxiliary sliding member 2 in a forward and backward rotating linkage, on the premise that the auxiliary sliding member 2 forms a sliding connection with the support rod 4, the main sliding member 3 and the support rod 4 are rotationally connected or slidingly connected; in this embodiment, the sliding connection between the main sliding member 3 and the support rod 4 is explained; one of the main sliding member 3 and the support rod 4 is provided with a guide pin 6, and the other of the main sliding member 3 and the support rod 4 is provided with a first guide groove 31. In this embodiment, the first guide groove 31 is arranged on the main sliding member 3; the first guide groove 31 extends in the vertical direction, and the guide pin 6 is slidably connected in the first guide groove 31; so that the support rod 4 and the main sliding member 3 establish a linkage relationship, and at the same time, the vertical first guide groove 31 also conforms to the position change in the vertical direction when the support rod 4 rotates, so that the support rod 4 can be smoothly rotated forward and opened.

[0033] Furthermore, in order to make the support rod 4 rotate and open more smoothly, the auxiliary sliding member 2 is provided with a second guide groove 21 extending in the front-to-back direction, and the guide pin 6 is slidably connected in the second guide groove 21; the base 1 is provided with an avoidance groove 13 for avoiding the active trajectory of the guide pin 6; Figure 1-3 As shown, the guide pin 6, the first guide groove 31, and the second guide groove 21 constitute a guiding structure. The guide pin 6 slides in the first guide groove 31 and the second guide groove 21 to guide the support rod 4 to rotate forward and open; the second guide groove 21 extends in the front-to-back direction to adapt to the position change of the support rod 4 in the front-to-back direction, and together with the first guide groove 31 forms a trajectory guide for the support rod 4, ensuring that the support rod 3 can smoothly rotate forward and open.

[0034] Furthermore, after the support rod 4 is fully opened, in order to prevent the support rod 4 from accidentally rotating backward and affecting the stability of the sofa, the front end of the second guide groove 21 extends obliquely downward to form a locking groove 22. When the support rod 4 is rotated forward and fully opened, the guide pin 6 slides into the locking groove 22; preventing the support rod 4 from rotating in the opposite direction after being rotated and opened, thereby ensuring the stability of the sofa.

[0035] Further, if Figure 7 As shown, the head of the guide pin 6 has a limiting cap body facing the auxiliary sliding member 2, and the other end of the guide is provided with a connecting nut 63 facing the support rod 4. The support rod 4 is provided with a gasket 62 for increasing the contact area with the connecting nut 63; the limiting cap body and the connecting nut 63 limit the guide pin 6 between the auxiliary sliding member 2 and the support rod 4, preventing the guide pin 6 from moving along its own length direction; at the same time, to ensure that the guide pin 6 does not generate loud noise when sliding, a spacer 61 is provided between the first guide groove 31 and the second guide groove 21, and the spacer 61 is usually made of rubber material; the guide pin 6 is inserted into the spacer 61; The cam 51 is connected to the support rod 4 by the cam 52 and the support rod 4 is connected to the support rod 4 by the cam 52.

[0036] Furthermore, in order to enable the fitting portion 511 to slide with resistance in the slide groove 41, a rotating support shaft 5 is passed between the connecting member 51 and the auxiliary sliding member 2. The rotating support shaft 5 passes through the outside of the slide groove 41 and forms a passing section. An adjusting nut 54 is threadedly connected to the passing section. The adjusting nut 54 is rotated to make the connecting member 51 contact and rub with the support rod 4, so that the connecting member 51 has sliding resistance when sliding in the slide groove 41; the threaded adjustment nut 54 can force the connecting member 51 to contact with the support rod 4 and generate sliding friction. At the same time, the threaded connection method also makes it easy for the user to adjust the size of the sliding friction so that the sliding resistance is within a reasonable range.

[0037] Furthermore, in order to increase the force between the adjusting nut 54 and the support rod 4 and prevent the adjusting nut 54 from loosening, two washers 52 and an elastic pad 53 are provided between the adjusting nut 54 and the support rod 4. The elastic pad 53 is located between the two washers 52, and the adjusting nut 54 acts on the outer washer 52.

[0038] Furthermore, in this embodiment, another method can be used to achieve that the fitting portion 511 slides in the slide groove 41 with resistance, that is, when the fitting portion 511 is slidably connected to the slide groove 41, an interference fit is formed, so that the connecting member 51 has sliding resistance when sliding in the slide groove 41; specifically, the connecting member 51 can be made of wear-resistant material, and the width of the fitting portion 511 can be slightly larger than the width of the slide groove 41 so that a sliding interference fit is formed therebetween. After the interference fit, the fitting portion 511 contacts the inner wall of the slide groove 41 more closely and forms a greater friction force, thereby forming a sliding resistance, so that when in the forward state, the active sliding member 3 and the driven sliding member 2 can move forward and backward simultaneously. Furthermore, in order to facilitate linkage with the leg support assembly 9 of the sofa, a push portion 32 protruding outward and used to respond to external force is provided on the outer surface of the main sliding member 3, and a linkage groove 71 is provided on the linkage member 7. The push portion 32 of the main sliding member 3 is located in the linkage groove 71, so as to apply a force in the front-to-back direction to the push portion 32.

[0039] Furthermore, when the support rod 4 moves forward to a predetermined position, in order to make the auxiliary sliding member 2 stay in the corresponding position, a limiting structure is provided between the base 1 and the auxiliary sliding member 2, and the limiting structure can prevent the auxiliary sliding member 2 that has slid forward to the predetermined position from continuing to slide forward; specifically, the limiting structure includes a limiting surface 14 provided on the base 1, and a limiting block 24 facing the limiting surface 14 is provided on the auxiliary sliding member 2. When the forward moving component drives the support rod 4 to move forward, the limiting block 24 approaches the limiting surface 14; when the support rod 4 moves forward to its position, the limiting block 24 abuts against the limiting surface 14.

[0040] Furthermore, the main sliding member 3 and the auxiliary sliding member 2 can be arranged in an upper and lower interval arrangement, or can be arranged in an upper and lower staggered arrangement, but this will make the forward moving component occupy too much space on the base 1. Therefore, the main sliding member 3 and the auxiliary sliding member 2 in this embodiment are arranged side by side and slidably connected to the base 1; the side-by-side arrangement can reduce the longitudinal space occupied by the forward moving component on the base 1, optimize the structure of the forward moving support component, and save the space occupied by the forward moving component on the base 1.

[0041] Example 2: Figure 10 As shown, the difference between this embodiment and the above embodiment is that the connecting member 51 in this embodiment is provided with a matching portion 511 that matches the width of the slide groove 41, and the cross-sectional shape of the matching portion 511 is circular, and the matching portion 511 is slidably connected in the slide groove 41. In this embodiment, the connecting member 51 can be fixed on the auxiliary sliding member 2, or it can be rotatably connected to the auxiliary sliding member 2. The cross-sectional shape of the matching portion 511 is circular, so that the matching portion 511 can both slide in the slide groove 41 and rotate in the slide groove 41, so that the support rod 4 can rotate forward relative to the auxiliary sliding member 2, avoiding the support rod 4 from getting stuck when it rotates forward to open, thereby achieving the same effect as in the above embodiment.

[0042] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An anti-tilt sofa, characterized in that: The invention comprises two left-right symmetrical armrests (8) and a mechanical extension device (10) arranged between the two armrests (8) and capable of state transformation. A forward support assembly independent of the mechanical extension device (10) is installed on the inner side of at least one armrest (8). The forward support assembly comprises a base (1). A forward assembly is connected to the base (1) in a forward sliding manner. The forward assembly comprises a main sliding member (3) and a secondary sliding member (2). A support rod (4) capable of rotating forward and backward is connected in a linkage manner between the main sliding member (3) and the secondary sliding member (2). When the main sliding member (3) and the secondary sliding member (2) generate relative displacement, the support rod (4) can be linked to rotate forward and backward. The mechanical extension device (10) is provided with a linkage member (7) capable of linking the main sliding member (3) to move forward and backward. When the mechanical stretching device (10) changes state, it drives the linkage member (7) to move and acts on the main sliding member (3), so that the forward moving assembly slides forward and drives the support rod (4) to move forward. When the support rod (4) moves forward to the right position, the auxiliary sliding member (2) stays at the predetermined position. At this time, the main sliding member (3) continues to slide forward and drives the support rod (4) that has moved forward to the right position to rotate forward and open.

2. The anti-tilt sofa according to claim 1, characterized in that: The mechanical extension device (10) includes a leg support assembly (9) which is transmission-connected to the linkage member (7). When the leg support assembly (9) opens forward, it drives the linkage rod (7) to move and act on the main sliding member (3).

3. The anti-tilt sofa according to claim 1, characterized in that: The mechanical extension device (10) further includes a seat support assembly, the seat support assembly includes a seat support plate, the leg support assembly includes a leg support plate, and a mechanical extension assembly consisting of a plurality of connecting rods connected to each other is connected below the leg support plate and the seat support plate, wherein the linkage member (7) is connected to one of the connecting rods close to the main sliding member (3); when the mechanical extension assembly is actuated, the linkage member (7) moves forward following the connecting rod connected thereto to apply a forward force to the main sliding member (3).

4. The anti-tilt sofa according to claim 1, characterized in that: The mechanical extension device (10) has an extension state and a retracted state. When the mechanical extension device (10) switches from the retracted state to the extension state, the support rod (4) moves forward to a position and rotates forward to open; when the mechanical extension device (10) switches from the extension state to the retracted state, the linkage member (7) moves and acts on the main sliding member (3), causing the forward moving component and the support rod (4) to slide backward. When the auxiliary sliding member (2) resets backward and stops at the initial position, the main sliding member (3) continues to slide backward and links the support rod (4) to rotate backward and retract.

5. The anti-tilt sofa according to claim 1, characterized in that: The auxiliary sliding member (2) is slidably connected to the support rod (4), a connecting member (51) is provided on the auxiliary sliding member (2), and a sliding groove (41) extending along the length direction of the supporting rod (4) is provided on the auxiliary sliding member (2). The connecting member (51) and the sliding groove (41) form a sliding connection, and the connecting member (51) has sliding resistance when sliding in the sliding groove (41); When the support rod (4) moves forward, the support rod (4) and the connecting member (51) remain relatively fixed, so that the sliding assembly slides forward and drives the support rod (4) forward; when the auxiliary sliding member (2) stops at a predetermined position, the main sliding member (3) slides forward relative to the auxiliary sliding member (2) and forces the support rod (4) that has moved forward to overcome the sliding resistance and rotate forward to open.

6. The anti-tilt sofa according to claim 1, characterized in that: The main sliding member (3) is connected to the support rod (4) in a rotational or sliding manner.

7. The anti-tilt sofa according to claim 6, characterized in that: The main sliding member (3) and the support rod (4) are slidably connected; a guide pin (6) is provided on one of the main sliding member (3) and the support rod (4), and a first guide groove (31) is provided on the other of the main sliding member (3) and the support rod (4). The first guide groove (31) extends in a vertical direction, and the guide pin (6) is slidably connected in the first guide groove (31).

8. The anti-tilt sofa according to claim 7, characterized in that: The auxiliary sliding member (2) is provided with a second guide groove (21) extending in the front-to-back direction, and the guide pin (6) is slidably connected in the second guide groove (21); the guide pin (6), the first guide groove (31), and the second guide groove (21) constitute a guide structure, and the guide pin (6) slides in the first guide groove (31) and the second guide groove (21) to guide the support rod (4) to rotate forward and open.

9. The anti-tipping sofa according to claim 8, characterized in that: The front end of the second guide groove (21) extends obliquely downward to form a locking groove (22). When the support rod (4) is rotated forward and opened to its full position, the guide pin (6) slides into the locking groove (22).

10. The anti-tipping sofa according to claim 5, characterized in that: The connecting member (51) is rotatably connected to the auxiliary sliding member (2), and a matching portion (511) matching the width of the sliding groove (41) is provided on the connecting member (51), and the cross-sectional shape of the matching portion (511) is non-circular. The matching portion (511) is slidably connected in the sliding groove (41), so that the support rod (4) can rotate forward relative to the auxiliary sliding member (2).

11. The anti-tipping sofa according to claim 10, characterized in that: A rotation support shaft (5) is provided between the connecting member (51) and the auxiliary sliding member (2). The rotation support shaft (5) extends out of the chute (41) to form a protruding section. An adjusting nut (54) is threadedly connected to the protruding section. The adjusting nut (54) is rotated to cause the connecting member (51) to contact and rub against the support rod (4), so that the connecting member (51) has sliding resistance when sliding in the chute (41).

12. The anti-tipping sofa according to claim 1, characterized in that: An outwardly protruding push portion (32) is provided on the outer side surface of the main sliding member (3), and the linkage member (7) acts on the push portion (32).

13. The anti-tilt sofa according to claim 1, characterized in that: A limiting structure is provided between the base (1) and the auxiliary sliding member (2), the limiting structure comprising a limiting surface (14) provided on the base (1), and a limiting block (24) facing the limiting surface (14) provided on the auxiliary sliding member (2). When the sliding assembly drives the support rod (4) to move forward, the limiting block (24) approaches the limiting surface (14); when the support rod (4) moves forward to its position, the limiting block (24) abuts against the limiting surface (14) to prevent the auxiliary sliding member (2) that has slid forward to a predetermined position from continuing to slide forward.

14. The anti-tipping sofa according to claim 1, characterized in that: The main sliding member (3) and the auxiliary sliding member (2) are arranged side by side and slidably connected to the base (1).

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