A stretching assembly with backrest forward movement function

Abstract

The utility model discloses a stretch assembly with backrest forward function. The stretch assembly with backrest forward function includes seat mechanism and with seat mechanism swing joint's leg department mechanism and backrest mechanism, and backrest mechanism includes backrest mounting panel, and the front side pivot connection backrest connecting rod no.

Description

Technical Field

[0001] This utility model relates to the field of furniture manufacturing, and in particular to an extendable component with a backrest forward movement function. Background Technology

[0002] There is a Chinese utility model patent with publication number CN215738008U, entitled "A Retractable Device Capable of Achieving Zero Gravity". The disclosed backrest mechanism includes a backrest mounting plate, which is pivotally connected to a seat mounting plate via a 21st axis. The backrest mounting plate is pivotally connected to a rear support rod via a 22nd axis, and the rear support rod is pivotally connected to a rear rotating component via a 23rd axis. However, during the process of entering a reclining position, when the rear support rod pulls the backrest mounting plate backward, the backrest and the user's back will experience relative displacement, generating friction and even causing clothing to be pulled, resulting in user discomfort and affecting the user experience. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an extendable component with a backrest forward movement function that can eliminate friction when entering a lying position, thereby improving the user experience.

[0004] To achieve the above objectives, the technical solution adopted by the extension component with backrest forward movement function of this utility model is as follows:

[0005] An extendable assembly with a forward-moving backrest function includes a seat mechanism and a leg mechanism and a backrest mechanism movably connected to the seat mechanism. The backrest mechanism includes a backrest mounting plate. A backrest link 1 is pivotally connected to the front side of the bottom of the backrest mounting plate, and a backrest link 2 is pivotally connected to the rear side of the bottom of the backrest mounting plate. The top end of the backrest link 2 is pivotally connected to the backrest mounting plate, and the bottom end of the backrest link 2 is pivotally connected to the backrest link 3. The middle part of the backrest link 3 is pivotally connected to the middle part of the backrest link 1. The backrest links 1, 2, and 3 and the backrest mounting plate form a quadrilateral structure. The top end of the backrest link 1 is pivotally connected to the backrest mounting plate, and the bottom end of the backrest link 1 is pivotally connected to the backrest link 4. The middle part of the backrest link 4 is pivotally connected to the backrest link 5. The front ends of the backrest links 3, 4, and 5 are all rotatably connected to the seat mechanism, thus mounting the backrest mounting plate on the rear end of the seat mechanism.

[0006] Preferably, the upper side of the second backrest link is provided with a first limiting pin for abutting against the bottom edge of the backrest mounting plate.

[0007] Preferably, the middle part of the backrest link four is provided with a second limiting pin for abutting against the upper edge of the backrest link five.

[0008] Preferably, the backrest link three is provided with a third limiting pin, which is located between the backrest links one and two. The side wall of the backrest link one is provided with a limiting surface that cooperates with the third limiting pin, and the side wall of the backrest link two is provided with a boss that cooperates with the third limiting pin.

[0009] Preferably, the seat mechanism includes a side base rod, a front mounting member is pivotally connected to the front side of the side base rod, the bottom end of the front mounting member is pivotally connected to the side base rod, a front rotating member 1 is pivotally connected to the top end of the front mounting member, the bottom end of the front rotating member 1 is pivotally connected to the front mounting member, a seat mounting plate is pivotally connected to the top end of the front rotating member 1, a leg mechanism is mounted on the front side of the seat mounting plate, the front ends of backrest links 3 and 4 are pivotally connected to the rear of the seat mounting plate, the backrest links 1, 3, and 4 and the seat mounting plate form a quadrilateral structure, a middle rotating member is pivotally connected to the middle of the seat mounting plate, the middle part of the middle rotating member is pivotally connected to the seat mounting plate, a front rotating member 2 is pivotally connected to the top end of the middle rotating member, and the top end of the front rotating member 2 is pivotally connected to the middle rotating member 1. The rotating parts are pivotally connected. The bottom end of the front rotating part 2 is pivotally connected to the middle of the front mounting part. The bottom end of the middle rotating part is pivotally connected to the side connecting rod 1. The rear end of the side connecting rod 1 is pivotally connected to the middle rotating part. The front end of the side connecting rod 1 is rotatably connected to the leg mechanism. The rear side of the side bottom rod is pivotally connected to the rear mounting part. The bottom end of the rear mounting part is pivotally connected to the side bottom rod. The top end of the rear mounting part is pivotally connected to the rear rotating part. The top end of the rear rotating part is pivotally connected to the rear mounting part. The front side of the bottom of the rear rotating part is pivotally connected to the seat mounting plate. The rear side of the bottom of the rear rotating part is pivotally connected to the backrest connecting rod 5. The middle part of the rear rotating part is pivotally connected to the side connecting rod 2. The rear end of the side connecting rod 2 is pivotally connected to the rear rotating part. The front end of the side connecting rod 2 is pivotally connected to the middle of the front rotating part 1.

[0010] Preferably, the leg mechanism includes a leg link one and a leg link two pivotally connected to the front side of the seat mounting plate. The rear end of the leg link one is pivotally connected to the seat mounting plate, and the front end of the leg link one is pivotally connected to a leg link three. The rear end of the leg link two is pivotally connected to the seat mounting plate. A side link one is pivotally connected to the rear part of the leg link two. The front end of the leg link two is pivotally connected to a leg link four. The rear part of the leg link four is pivotally connected to the front part of the leg link one. The front end of the leg link four is pivotally connected to a footrest mounting plate. The tail end of the footrest mounting plate is pivotally connected to the leg link four, and the middle part of the footrest mounting plate is pivotally connected to the front end of the leg link three.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] When transitioning to a reclining position, the backrest mounting plate tilts backward while moving forward simultaneously, thanks to the action of links one through five. This prevents relative displacement between the backrest and the user's back, eliminating friction and improving the user experience. Furthermore, it allows the sofa to be placed without any wall contact, resulting in a more aesthetically pleasing arrangement and saving space. Attached Figure Description

[0013] Figure 1 This is a diagram showing the seated posture of the extension component with a forward backrest function according to this utility model.

[0014] Figure 2 This is a TV-position front view of the extendable component with backrest forward movement function of this utility model.

[0015] Figure 3 This is a TV-style rear view of the extendable component with a forward-moving backrest function of this utility model.

[0016] Figure 4 This is a front view of the reclining position of the extendable component with a forward-moving backrest function of this utility model.

[0017] Figure 5 This is a reclining rear view of the extension component with a forward-moving backrest function of this utility model.

[0018] Figure 6 This is a schematic diagram of the backrest mechanism.

[0019] Among them, 10 is the seat mechanism, 101 is the side bottom rod, 102 is the front mounting part, 103 is the front rotating part one, 104 is the seat mounting plate, 105 is the middle rotating part, 106 is the front rotating part two, 107 is the side connecting rod one, 108 is the rear mounting part, 109 is the rear rotating part, 110 is the side connecting rod two, 20 is the leg mechanism, 201 is the leg connecting rod one, 202 is the leg connecting rod two, 203 is the leg connecting rod three, 204 is the leg connecting rod four, 205 is the footrest mounting plate, 30 is the backrest mechanism, 301 is the backrest mounting plate, 302 is the backrest connecting rod one, 3021 is the limiting surface, 303 is the backrest connecting rod two, 3031 is the first limiting pin, 3032 is the boss, 304 is the backrest connecting rod three, 3041 is the third limiting pin, 305 is the backrest connecting rod four, 3051 is the second limiting pin, and 306 is the backrest connecting rod five. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0021] like Figure 1-6As shown, an extendable assembly with a backrest forward-moving function includes a seat mechanism 10. The seat mechanism 10 includes a side base rod 101. The front side of the side base rod 101 is pivotally connected to a front mounting member 102. The bottom end of the front mounting member 102 is pivotally connected to the side base rod 101. The top end of the front mounting member 102 is pivotally connected to a front rotating member 103. The bottom end of the front rotating member 103 is pivotally connected to the front mounting member 102. The top end of the front rotating member 103 is pivotally connected to a seat mounting plate 104. A leg mechanism 20 is mounted on the front side of the seat mounting plate 104. The leg mechanism 20 includes a leg link 201 and a leg link 202 pivotally connected to the front side of the seat mounting plate 104. The rear end of the leg link 201 is pivotally connected to the seat mounting plate 104, and the front end of the leg link 201 is pivotally connected to a leg link. Leg link 202's rear end is pivotally connected to seat mounting plate 104; leg link 202's front end is pivotally connected to leg link 4 204; leg link 4 204's rear end is pivotally connected to leg link 1 201; leg link 4 204's front end is pivotally connected to footrest mounting plate 205; footrest mounting plate 205's rear end is pivotally connected to leg link 4 204; footrest mounting plate 205's middle part is pivotally connected to leg link 3 203; seat mounting plate 104's middle part is pivotally connected to intermediate rotating member 105; intermediate rotating member 105's middle part is pivotally connected to seat mounting plate 104; intermediate rotating member 105's top end is pivotally connected to front rotating member 2 106; front rotating member 2 106's top end is pivotally connected to intermediate rotating member 105; front rotating member 2 106's bottom end... The middle rotating member 105 is pivotally connected to the middle part of the front mounting member 102. The bottom end of the middle rotating member 105 is pivotally connected to the side connecting rod 107. The rear end of the side connecting rod 107 is pivotally connected to the middle rotating member 105. The front end of the side connecting rod 107 is pivotally connected to the rear part of the leg connecting rod 202. The rear side of the side bottom rod 101 is pivotally connected to the rear mounting member 108. The bottom end of the rear mounting member 108 is pivotally connected to the side bottom rod 101. The top end of the rear mounting member 108 is pivotally connected to the rear rotating member 109. The top end of the rear rotating member 109 is pivotally connected to the rear mounting member 108. The front side of the bottom of the rear rotating member 109 is pivotally connected to the seat mounting plate 104. The middle part of the rear rotating member 109 is pivotally connected to the side connecting rod 210. The rear end of the side connecting rod 210 is pivotally connected to the rear rotating member 109. The front end of the side connecting rod 210 is pivotally connected to the front rotating member 102. In the middle of seat mounting plate 104, a backrest mechanism 30 is mounted on the rear side. The backrest mechanism 30 includes a backrest mounting plate 301. A backrest connecting rod 302 is pivotally connected to the front side of the bottom of the backrest mounting plate 301, and a backrest connecting rod 303 is pivotally connected to the rear side of the bottom of the backrest mounting plate 301. A first limiting pin 3031 is mounted on the upper side of the backrest connecting rod 303 to abut against the bottom edge of the backrest mounting plate 301. In a sitting or TV position, the first limiting pin 3031 abuts against the bottom edge of the backrest mounting plate 301 to improve support and prevent the backrest from wobbling. The top end of the backrest connecting rod 303 is pivotally connected to the backrest mounting plate 104, the bottom end of the backrest connecting rod 303 is pivotally connected to the backrest connecting rod 304, and the front end of the backrest connecting rod 304 is pivotally connected to the seat mounting plate 104.The middle part of backrest link 304 is pivotally connected to the middle part of backrest link 102. Backrest links 1, 2, and 3, along with the backrest mounting plate, form a quadrilateral structure. The top of backrest link 102 is pivotally connected to the backrest mounting plate 104. The bottom of backrest link 102 is pivotally connected to backrest link 405. The front of backrest link 405 is pivotally connected to the seat mounting plate 104. Backrest links 1, 3, and 4, along with the seat mounting plate, form a quadrilateral structure. The middle part of backrest link 405 is pivotally connected to backrest link 506. The top of backrest link 506 is pivotally connected to backrest link 405. The bottom of backrest link 506 is pivotally connected to the rear side of the bottom of the rear rotating member 109. A second limiting pin 3051 for abutting against the upper edge of backrest link 506 is installed in the middle of backrest link 405. Pin 3051 ensures that there is always a certain angle between backrest links four and five, thereby ensuring that backrest link five can smoothly drive the quadrilateral structure composed of backrest links one, three, four, and the seat mounting plate to deform. A third limiting pin 3041 is installed on backrest link three 304, located between backrest links one and two. A limiting surface 3021 that mates with the third limiting pin 3041 is formed on the side wall of backrest link one 302. A boss 3032 that mates with the third limiting pin 3041 is integrally formed on the side wall of backrest link two 303. When the backrest mechanism is open, the third limiting pin 3041 abuts against the boss 3032, limiting the angle at which the backrest flips backward. When the backrest mechanism is closed, the third limiting pin 3041 abuts against the limiting surface 3021, ensuring that the backrest does not wobble.

[0022] The specific working process and principle of the extension component with backrest forward movement function of this utility model are as follows: When changing to a reclining position, the rear rotating component 109 rotates clockwise and pulls the backrest link 5 306. The backrest link 5 306 forces the quadrilateral structure composed of backrest links 1, 3, and 4 and the seat mounting plate to deform. The backrest link 1 302 rotates counterclockwise around its pivot axis with the backrest link 304, forcing the quadrilateral structure composed of backrest links 1, 2, and 3 and the backrest mounting plate to deform. The rear end of the bottom of the backrest mounting plate 301 is pulled backward by the backrest link 2 303 and flips backward. At the same time, the front end of the bottom of the backrest mounting plate 301 is pulled forward by the backrest link 1 302. That is, the backrest mounting plate tilts backward while moving forward, avoiding relative displacement between the backrest and the human back, eliminating friction, and avoiding discomfort caused by the user's clothes being pulled, thereby improving the user's experience. Furthermore, it allows the movable sofa to be placed without touching the wall, resulting in a more aesthetically pleasing arrangement and saving space. In addition, after the backrest is moved forward with the backrest mounting plate, the gap between the bottom of the backrest and the back of the seat cushion is eliminated, improving the appearance.

Claims

1. An extension assembly with a backrest forward movement function, comprising a seat mechanism and a leg mechanism and a backrest mechanism movably connected with the seat mechanism, characterized in that: The backrest mechanism comprises a backrest mounting plate, a front side of a bottom of the backrest mounting plate is pivotally connected with a backrest connecting rod one, a rear side of the bottom of the backrest mounting plate is pivotally connected with a backrest connecting rod two, a top end of the backrest connecting rod two is pivotally connected with the backrest mounting plate, a bottom end of the backrest connecting rod two is pivotally connected with a backrest connecting rod three, a middle part of the backrest connecting rod three is pivotally connected with a middle part of the backrest connecting rod one, the backrest connecting rods one, two, three and the backrest mounting plate form a quadrilateral structure, a top end of the backrest connecting rod one is pivotally connected with the backrest mounting plate, a bottom end of the backrest connecting rod one is pivotally connected with a backrest connecting rod four, a middle part of the backrest connecting rod four is pivotally connected with a backrest connecting rod five, front ends of the backrest connecting rods three, four and five are rotationally connected with the seat mechanism, and the backrest mounting plate is arranged at a tail end of the seat mechanism.

2. The stretch assembly with backrest forward movement function according to claim 1, characterized in that: The backrest connecting rod two is provided with a first limiting pin on an upper side of the backrest connecting rod two, and the first limiting pin is used for abutting against an edge of a bottom of the backrest mounting plate.

3. The stretch assembly with the backrest forward movement function according to claim 2, characterized in that: The backrest connecting rod four is provided with a second limiting pin on a middle part of the backrest connecting rod four, and the second limiting pin is used for abutting against an upper side edge of the backrest connecting rod five.

4. The stretch assembly with the backrest forward movement function according to claim 3, characterized in that: The backrest connecting rod three is provided with a third limiting pin, the third limiting pin is located between the backrest connecting rods one and two, a side wall of the backrest connecting rod one is provided with a limiting surface matched with the third limiting pin, and a side wall of the backrest connecting rod two is provided with a boss matched with the third limiting pin.

5. The stretch assembly with backrest forward movement function according to claim 1, characterized in that: The seat mechanism comprises a side bottom rod, a front side of the side bottom rod is pivotally connected with a front mounting piece, a bottom end of the front mounting piece is pivotally connected with the side bottom rod, a top end of the front mounting piece is pivotally connected with a front rotating piece one, a bottom end of the front rotating piece one is pivotally connected with the front mounting piece, a top end of the front rotating piece one is pivotally connected with a seat mounting plate, a leg mechanism is arranged at a front side of the seat mounting plate, front ends of the backrest connecting rods three and four are pivotally connected at a rear part of the seat mounting plate, the backrest connecting rods one, three and four and the seat mounting plate form a quadrilateral structure, a middle part of the seat mounting plate is pivotally connected with a middle rotating piece, a middle part of the middle rotating piece is pivotally connected with the seat mounting plate, a top end of the middle rotating piece is pivotally connected with a front rotating piece two, a top end of the front rotating piece two is pivotally connected with the middle rotating piece, a bottom end of the front rotating piece two is pivotally connected at a middle part of the front mounting piece, a bottom end of the middle rotating piece is pivotally connected with a side connecting rod one, a rear end of the side connecting rod one is pivotally connected with the middle rotating piece, a front end of the side connecting rod one is rotationally connected with the leg mechanism, a rear side of the side bottom rod is pivotally connected with a rear mounting piece, a bottom end of the rear mounting piece is pivotally connected with the side bottom rod, a top end of the rear mounting piece is pivotally connected with a rear rotating piece, a top end of the rear rotating piece is pivotally connected with the rear mounting piece, a front side of a bottom of the rear rotating piece is pivotally connected with the seat mounting plate, a rear side of the bottom of the rear rotating piece is pivotally connected with the backrest connecting rod five, a middle part of the rear rotating piece is pivotally connected with a side connecting rod two, a rear end of the side connecting rod two is pivotally connected with the rear rotating piece, and a front end of the side connecting rod two is pivotally connected at a middle part of the front rotating piece one.

6. The stretch assembly with the backrest forward movement function according to claim 5, characterized in that: The leg mechanism comprises a leg connecting rod one and a leg connecting rod two, the leg connecting rod one is pivotally connected at a front side of the seat mounting plate, a rear end of the leg connecting rod one is pivotally connected with the seat mounting plate, a front end of the leg connecting rod one is pivotally connected with a leg connecting rod three, a rear end of the leg connecting rod two is pivotally connected with the seat mounting plate, the side connecting rod one is pivotally connected at a rear part of the leg connecting rod two, a front end of the leg connecting rod two is pivotally connected with a leg connecting rod four, a rear part of the leg connecting rod four is pivotally connected with a front part of the leg connecting rod one, a front end of the leg connecting rod four is pivotally connected with a footrest mounting plate, a tail end of the footrest mounting plate is pivotally connected with the leg connecting rod four, and a middle part of the footrest mounting plate is pivotally connected with a front end of the leg connecting rod three.

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