Sofa stretching device with internally-retracted main footrest

Abstract

The utility model discloses a sofa stretching device with a main footrest folded inwards. The main footrest inward folding type sofa stretching device comprises an assembling side plate, the assembling side plate is connected with a seat frame mounting plate through a seat linkage mechanism, a leg mechanism is arranged on the front side of the seat frame mounting plate and comprises a first leg connecting rod and a second leg connecting rod which are pivoted to the front side of the seat frame mounting plate, the front end of the first leg connecting rod is pivoted with a third leg connecting rod, and the front end of the second leg connecting rod is pivoted with a second leg connecting rod. The side, close to the first leg connecting rod, of the third leg connecting rod is in pivot joint with a second leg connecting rod, the front end of the second leg connecting rod is in pivot joint with a fourth leg connecting rod, the front ends of the third leg connecting rod and the fourth leg connecting rod are in pivot joint with the same large foot rest, and the vertical distance difference delta H1 between the axes of pivot joint shafts at the front ends of the third leg connecting rod and the fourth leg connecting rod and the installation face of the main foot rest ranges from 0 mm to 5 mm. And the vertical distance difference delta H2 between the axes of the pivot shafts at the front ends of the leg connecting rods III and IV and the end surface of the tail part of the main leg supporter is 40-50mm. The foot rest solves the problem that in the prior art, when the foot rest retracts, the foot rest scrapes the ground easily, and user experience is affected.

Description

Technical Field

[0001] The utility model relates to the technical field of home furnishing manufacturing, in particular to a sofa extension device with inward-retracting main footrest. Background Art

[0002] Existing movable sofas can be positioned in three positions: sitting, TV-style, and reclining. In the sitting position, the leg and backrest mechanisms are retracted. Extending the leg mechanism allows the user to enter the TV-style position, and further extending the backrest allows the user to enter the reclining position. However, when the leg mechanism retracts, the main footrest flips to an upright position, causing the footrest mounted on the main footrest to scrape against the floor, affecting the user experience. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a sofa extension device with a main footrest that can avoid scraping the floor when the footrest is retracted, thereby improving the user experience.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the main leg retracting sofa extension device of the present invention is:

[0005] A sofa extension device with an inward-retracting main footrest comprises an assembly side panel, which is connected to a seat frame mounting plate through a seat linkage mechanism, a leg mechanism is provided on the front side of the seat frame mounting plate, the leg mechanism comprises a leg connecting rod 1 and a leg connecting rod 2 pivotally connected to the front side of the seat frame mounting plate, a front end of the leg connecting rod 1 is pivotally connected to a leg connecting rod 3, the leg connecting rod 3 is pivotally connected to the leg connecting rod 2 next to one side of the leg connecting rod 1, the leg connecting rods 1, 2, 3 and the seat frame mounting plate form a quadrilateral structure, a first limiting pin is provided in the middle of the leg connecting rod 1, the leg connecting rod 2 is provided with a first limiting surface cooperating with the first limiting pin, and the leg connecting rod 3 is pivotally connected to the front end of the leg connecting rod 1. A second limiting surface is provided which cooperates with the first limiting pin. The front end of the leg link two is pivotally connected to the leg link four. The front ends of the leg links three and four are pivotally connected to the same large footrest. The leg links two, three, four and the large footrest form another quadrilateral structure. A second limiting pin is provided in the middle of the leg link three. The leg link four is provided with a third limiting surface which cooperates with the second limiting pin. The vertical distance difference ΔH1=0-5mm between the axis of the front end pivot shafts of the leg links three and four and the mounting surface of the main footrest is respectively, and the vertical distance difference ΔH2=40-50mm between the axis of the front end pivot shafts of the leg links three and four and the tail end face of the main footrest is respectively.

[0006] Preferably, the seat linkage mechanism includes a front support member 1 and a rear support member 1, the bottom ends of the front and rear support members 1 are pivotally connected to the assembly side plates, the tops of the front and rear support members 1 are pivotally connected to the same side link member 1, the upper part of the front support member 1 is pivotally connected to the front rotating member, the upper part of the rear support member 1 is pivotally connected to the rear rotating member, the middle part of the rear rotating member is pivotally connected to a linkage rod 1, the front end of the linkage rod 1 is pivotally connected to the middle part of the side link member 1, the bottoms of the front and rear rotating members are pivotally connected to the same side link member 2, the front end of the side link member 2 is pivotally connected to the front support member 2, the rear end of the side link member 2 is pivotally connected to the rear support member 2, the top ends of the front and rear support members 2 are respectively pivotally connected to the seat frame mounting plates, the middle part of the rear support member 2 is pivotally connected to a linkage rod 2, and the front end of the linkage rod 2 is pivotally connected to the tail end of the leg link 1.

[0007] Preferably, a backrest mechanism is provided on the rear side of the seat frame mounting plate, and the backrest mechanism includes a backrest bracket fixedly connected to the seat frame mounting plate, the front side of the backrest bracket is pivotally connected to a backrest link 1, the top of the backrest link 1 is pivotally connected to the backrest mounting plate, the bottom front side of the backrest mounting plate is pivotally connected to the backrest link 1, the bottom rear side of the backrest mounting plate is pivotally connected to a backrest support rod, the top of the backrest support rod is pivotally connected to the backrest mounting plate, the bottom of the backrest support rod is pivotally connected to the backrest bracket, the bottom of the backrest link 1 is pivotally connected to a backrest link 2, the front end of the backrest link 2 is pivotally connected to the backrest link 1, the rear end of the backrest link 2 is pivotally connected to a backrest link 3, the top end of the backrest link 3 is pivotally connected to the rear of the backrest bracket, the bottom of the backrest link 3 is pivotally connected to a limiting link, one end of the limiting link is pivotally connected to the backrest link 3, and the other end is pivotally connected to the tail of the assembly side plate.

[0008] Preferably, a third limiting pin is provided on one side of the backrest connecting rod adjacent to the backrest bracket, and the backrest bracket is provided with an arc-shaped groove for the third limiting pin to slide.

[0009] Preferably, a fourth limiting pin is provided on one side of the backrest connecting rod adjacent to the backrest mounting plate, and the backrest mounting plate is provided with a fourth limiting surface cooperating with the fourth limiting pin.

[0010] Preferably, a fifth limiting pin is provided on one side of the backrest support rod adjacent to the backrest mounting plate, and the backrest mounting plate is provided with a fifth limiting surface that cooperates with the fifth limiting pin.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. When the leg mechanism retracts, the leg link three pivotally connected to the middle of the main footrest can increase the rotation angle of the main footrest around the pivot axis between the main footrest and the leg link three, that is, it increases the distance between the footrest and the ground when it is retracted, thereby avoiding scraping the ground and improving the user experience.

[0013] 2. When the leg mechanism retracts, the first limit pin conflicts with the second limit surface, and the second limit pin conflicts with the third limit surface, preventing the leg mechanism from retracting excessively without affecting the re-expansion of the leg mechanism; when the leg mechanism is expanded, the first limit pin conflicts with the first limit surface, preventing the leg mechanism from expanding excessively without affecting the retraction of the leg mechanism. At the same time, the first limit pin also plays a supporting role, improving the stability of the expanded state of the leg mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a sofa extension device with a main leg-retracting type.

[0015] Figure 2 This is a diagram of the leg mechanism of the present invention in an expanded state.

[0016] Figure 3 yes Figure 2 Enlarged view of point C.

[0017] Figure 4 This is a diagram of the leg mechanism of the present invention in a retracted state.

[0018] Figure 5 It is a front view of the seat linkage mechanism of the present utility model.

[0019] Figure 6 It is a rear view of the seat linkage mechanism of the present invention.

[0020] Figure 7 It is a front view of the backrest mechanism of the present utility model.

[0021] Figure 8 It is a rear view of the backrest mechanism of the present utility model.

[0022] Among them, 10 assembly side panel, 20 seat linkage mechanism, 201 front support member 1, 202 rear support member 1, 203 side link member 1, 204 front rotating member, 205 rear rotating member, 206 linkage rod 1, 207 side link member 2, 208 front support member 2, 209 rear support member 2, 210 linkage rod 2, 30 seat frame mounting plate, 40 leg mechanism, 401 leg link 1, 4011 first limit pin, 402 leg link 2, 4021 first limit surface, 403 leg link 3, 40 31 second limiting surface, 4032 second limiting pin, 404 leg connecting rod four, 4041 third limiting surface, 405 large footrest, 50 backrest mechanism, 501 backrest bracket, 5011 arc-shaped groove, 502 backrest connecting rod one, 5021 third limiting pin, 5022 fourth limiting pin, 503 backrest mounting plate, 5031 fourth limiting surface, 5032 fifth limiting surface, 504 backrest support rod, 5041 fifth limiting pin, 505 backrest connecting rod two, 506 backrest connecting rod three, 507 limiting connecting rod. DETAILED DESCRIPTION

[0023] The present invention is further illustrated below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0024] like Figure 1-8As shown, a sofa extension device with a main footrest retracted, comprising an assembly side panel 10, the assembly side panel being connected to a seat frame mounting plate 30 via a seat linkage mechanism 20, the seat linkage mechanism comprising a front support member 201 and a rear support member 202, the bottom ends of the front and rear support members 1 being pivotally connected to the assembly side panel, the tops of the front and rear support members 1 being pivotally connected to the same side link member 1 203, the upper portion of the front support member 1 being pivotally connected to a front rotating member 204, the upper portion of the rear support member 1 being pivotally connected to a rear rotating member 205, the middle portion of the rear rotating member being pivotally connected to a linkage rod 1 206, the front end of the linkage rod 1 being pivotally connected to the middle portion of the side link member 1, the bottoms of the front and rear rotating members being pivotally connected to the same side link member 2 207, the front end of the side link member 2 being pivotally connected to the front support member 2 208, and the rear end of the side link member 2 being pivotally connected to the rear support member 2 2 09, the top ends of the front and rear support members 2 are pivotally connected to the seat frame mounting plate respectively, the middle part of the rear support member 2 is pivotally connected to the linkage rod 210, the front end of the linkage rod 2 is connected to the leg mechanism 40 installed on the front side of the seat frame mounting plate, the leg mechanism includes a leg link 1 401 and a leg link 2 402 pivotally connected to the front side of the seat frame mounting plate, the tail end of the leg link 1 is pivotally connected to the front end of the linkage rod 2, the front end of the leg link 1 is pivotally connected to the leg link 3 403, the leg link 3 is pivotally connected to the leg link 2 next to one side of the leg link 1, the leg links 1, 2, 3 and the seat frame mounting plate form a quadrilateral structure, the middle part of the leg link 1 is installed with a first limit pin 4011, the leg link 2 is provided with a first limit surface 4021 that cooperates with the first limit pin, when the leg mechanism is unfolded, the first limit The pin conflicts with the first limit surface, preventing the leg mechanism from over-expanding without affecting the retraction of the leg mechanism. At the same time, the first limit pin also plays a supporting role to improve the stability of the expanded state of the leg mechanism. Leg link three has a second limit surface 4031 that cooperates with the first limit pin. The front end of leg link two is pivotally connected to leg link four 404. Leg link four is a straight rod with a simpler shape, which is conducive to improving material utilization and reducing production costs. The front ends of leg links three and four are pivotally connected to the same large footrest 405. Leg links two, three, four and the large footrest constitute another quadrilateral structure. A second limit pin 4032 is installed in the middle of leg link three. Leg link four has a third limit surface 4041 that cooperates with the second limit pin. When the leg mechanism retracts, the first limit pin It conflicts with the second limiting surface, and the second limiting pin conflicts with the third limiting surface, preventing the leg mechanism from retracting excessively without affecting the re-expansion of the leg mechanism. The vertical distance difference ΔH1 between the front end pivot axis of the leg connecting rods 3 and 4 and the main footrest mounting surface is 1mm, and the vertical distance difference ΔH2 between the front end pivot axis of the leg connecting rods 3 and 4 and the tail end surface of the main footrest is 45mm. When the large footrest is retracted, the angle α between its mounting surface and the ground is 42°. The backrest mechanism 50 is installed on the rear side of the seat frame mounting plate. The backrest mechanism includes a backrest bracket 501 fixed to the seat frame mounting plate. The front side of the backrest bracket is pivotally connected to the backrest connecting rod 1 502. The top of the backrest connecting rod 1 is pivotally connected to the backrest mounting plate 503. The backrest connecting rod 1 is installed on one side of the backrest bracket with a third limiting pin 5021.The backrest bracket is provided with an arc groove 5011 for the sliding of the third limit pin. When the backrest of the movable sofa is unfolded, the third limit pin slides in the arc groove to prevent the backrest from twisting, thereby improving the synchronization of the backrest mechanisms on both sides. A fourth limit pin 5022 is installed on one side of the backrest connecting rod next to the backrest mounting plate. The backrest mounting plate is provided with a fourth limit surface 5031 that cooperates with the fourth limit pin. When the backrest mechanism is unfolded, the fourth limit pin conflicts with the fourth limit surface to ensure the stability of the backrest in the unfolded state. The bottom front side of the backrest mounting plate is pivotally connected to the backrest connecting rod, the bottom rear side of the backrest mounting plate is pivotally connected to the backrest support rod 504, the top of the backrest support rod is pivotally connected to the backrest mounting plate, and the bottom of the backrest support rod is pivotally connected to the backrest mounting plate. The backrest support rod is pivotally connected to the backrest bracket. A fifth limiting pin 5041 is installed on one side of the backrest mounting plate. The backrest mounting plate has a fifth limiting surface 5032 that cooperates with the fifth limiting pin. When the backrest mechanism is in the retracted state, the fifth limiting pin and the fifth limiting surface conflict with each other, ensuring the stability of the retracted backrest. The bottom of the backrest link 1 is pivotally connected to the backrest link 2 505. The front end of the backrest link 2 is pivotally connected to the backrest link 1, and the rear end of the backrest link 2 is pivotally connected to the backrest link 3 506. The top of the backrest link 3 is pivotally connected to the rear of the backrest bracket. The bottom of the backrest link 3 is pivotally connected to the limiting link 507. One end of the limiting link is pivotally connected to the backrest link 3, and the other end is pivotally connected to the rear end of the assembly side plate.

[0025] The specific working process and principle of the present invention are as follows: when the leg mechanism is retracted, the front ends of the leg links one and two rotate downward, and the leg link three rotates around the pivot axis with the leg link two while moving toward the rear side. The large footrest moves toward the side of the seat frame mounting plate along with the leg link. At the same time, the leg link four pulls the large footrest to rotate downward around the axis of the leg link two and the pivot axis of the large footrest. Since the distance between the pivot axes of the front ends of the leg links three and four is shortened, the rotation angle of the large footrest during retraction can be increased, thereby increasing the distance between the footrest and the ground when it is retracted, avoiding scraping the ground and improving the user experience.

Claims

1. A sofa extension device with an inward-retracting main footrest, comprising an assembly side panel, the assembly side panel being connected to a seat frame mounting plate via a seat linkage mechanism, a leg mechanism being provided on the front side of the seat frame mounting plate, the leg mechanism comprising a leg link 1 and a leg link 2 pivotally connected to the front side of the seat frame mounting plate, a leg link 3 being pivotally connected to the front end of the leg link 1, a leg link 3 being pivotally connected to the leg link 2 adjacent to one side of the leg link 1, the leg links 1, 2, 3 and the seat frame mounting plate forming a quadrilateral structure, the middle portion of the leg link 1 A first limiting pin is provided, the leg link 2 is provided with a first limiting surface that cooperates with the first limiting pin, the leg link 3 is provided with a second limiting surface that cooperates with the first limiting pin, the front end of the leg link 2 is pivotally connected to the leg link 4, the front ends of the leg links 3 and 4 are pivotally connected to the same large footrest, the leg links 2, 3, 4 and the large footrest constitute another quadrilateral structure, the middle part of the leg link 3 is provided with a second limiting pin, the leg link 4 is provided with a third limiting surface that cooperates with the second limiting pin, and the characteristics are: The vertical distance difference ΔH1 from the front end pivot axis of the leg link three and four to the main footrest mounting surface is 0-5mm, and the vertical distance difference ΔH2 from the front end pivot axis of the leg link three and four to the tail end surface of the main footrest is 40-50mm.

2. The main leg-retracting sofa extension device according to claim 1, characterized in that: The seat linkage mechanism includes a front support member and a rear support member, the bottom ends of the front and rear support members are pivotally connected to the assembly side plates, the tops of the front and rear support members are pivotally connected to the same side link member, the upper part of the front support member is pivotally connected to the front rotating member, the upper part of the rear support member is pivotally connected to the rear rotating member, the middle part of the rear rotating member is pivotally connected to a linkage rod, the front end of the linkage rod is pivotally connected to the middle part of the side link member, the bottoms of the front and rear rotating members are pivotally connected to the same side link member, the front end of the side link member is pivotally connected to the front support member, the rear end of the side link member is pivotally connected to the rear support member, the top ends of the front and rear support members are respectively pivotally connected to the seat frame mounting plates, the middle part of the rear support member is pivotally connected to a linkage rod, and the front end of the linkage rod is pivotally connected to the tail end of the leg link.

3. The main leg-retracting sofa extension device according to claim 1, characterized in that: The rear side of the seat frame mounting plate is provided with a backrest mechanism, and the backrest mechanism includes a backrest bracket fixedly connected to the seat frame mounting plate, the front side of the backrest bracket is pivotally connected to a backrest link 1, the top of the backrest link 1 is pivotally connected to the backrest mounting plate, the bottom front side of the backrest mounting plate is pivotally connected to the backrest link 1, the bottom rear side of the backrest mounting plate is pivotally connected to a backrest support rod, the top of the backrest support rod is pivotally connected to the backrest mounting plate, the bottom of the backrest support rod is pivotally connected to the backrest bracket, the bottom of the backrest link 1 is pivotally connected to a backrest link 2, the front end of the backrest link 2 is pivotally connected to the backrest link 1, the rear end of the backrest link 2 is pivotally connected to a backrest link 3, the top end of the backrest link 3 is pivotally connected to the rear part of the backrest bracket, the bottom of the backrest link 3 is pivotally connected to a limiting link, one end of the limiting link is pivotally connected to the backrest link 3, and the other end is pivotally connected to the tail end of the assembly side plate.

4. The main leg-retracting sofa extension device according to claim 3, characterized in that: A third limiting pin is provided on one side of the backrest connecting rod adjacent to the backrest bracket, and the backrest bracket is provided with an arc groove for the third limiting pin to slide.

5. The main leg-retracting sofa extension device according to claim 4, characterized in that: A fourth limiting pin is provided on one side of the backrest connecting rod adjacent to the backrest mounting plate, and the backrest mounting plate is provided with a fourth limiting surface that cooperates with the fourth limiting pin.

6. The main leg-retracting sofa extension device according to claim 3, characterized in that: A fifth limiting pin is provided on one side of the backrest support rod adjacent to the backrest mounting plate, and the backrest mounting plate is provided with a fifth limiting surface that cooperates with the fifth limiting pin.

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