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US-12622527-B2 - Sofa unfolding device

US12622527B2US 12622527 B2US12622527 B2US 12622527B2US-12622527-B2

Abstract

The present application relates to a sofa unfolding device capable of avoiding forward overturning, including a seat, a backrest assembly, a linkage assembly, and a leg rest assembly, wherein the linkage assembly is rotatably connected on the seat, the backrest assembly is rotatably connected to a rear end of the seat via the linkage assembly, the leg rest assembly is rotatably connected to a front end of the seat via the linkage assembly, a support mechanism is connected on the front end of the seat and comprises an abutting member and a support member, the abutting member is rotatably connected with the linkage assembly via a first pivot, and the support member is rotatably connected with the abutting assembly via a second pivot and is rotatably connected with the seat via a third pivot.

Inventors

  • Yunhai LI
  • Yuanfeng FENG
  • Linlin Wu
  • Zhiyu Wang
  • Liang Cui

Assignees

  • JASON FURNITURE (HANGZHOU) CO., LTD.

Dates

Publication Date
20260512
Application Date
20230605

Claims (19)

  1. 1 . A sofa unfolding device, comprising a backrest assembly, a linkage assembly, and a seat; wherein the linkage assembly is provided on the seat; the backrest assembly is rotatably connected with the linkage assembly; a support mechanism is provided at a front end of the linkage assembly; and the support mechanism is configured to stretch simultaneously forward and downward with unfolding of the linkage assembly and abut against a ground to act as a support structure, the support mechanism comprises an abutting member and a support assembly; the abutting member is rotatably connected with the linkage assembly via a first pivot; the support assembly is rotatably connected with the abutting member via a second pivot; and the support assembly is rotatably connected with the seat via a third pivot; and the abutting member is configured to stretch simultaneously forward and downward with the unfolding of the linkage assembly and abut against the ground, and a second support assembly is provided on the seat and configured to slide back and forth along the seat from a rear end of the seat to a front end of the seat, a linkage member is rotatably connected on the second support assembly via a fifth pivot and is rotatably connected with the support assembly via a sixth pivot, the second support assembly is configured to be driven by the linkage member to slide forward when the linkage assembly is unfolded, and the second support assembly comprises a support part located at the front end of the seat.
  2. 2 . The sofa unfolding device according to claim 1 , wherein a bottom of the abutting member is at a first position when the linkage assembly is in a folded state; the abutting member is at a second position when the linkage assembly is in an unfolded state; and a horizontal distance between the first position and the second position is greater than 100 mm.
  3. 3 . The sofa unfolding device according to claim 1 , wherein the abutting member is rotatably connected at a top of the abutting member with the linkage assembly via the first pivot; a bottom of the abutting member is configured to be a free end and connected with a roller; the roller is configured to be located above the seat when the linkage assembly is folded and located in front of the seat when the linkage assembly is unfolded; the support assembly comprises a support rod body; the support rod body is rotatably connected at a first end of the support rod body with the abutting member via the second pivot; and the support rod body is rotatably connected at a second end of the support rod body with the seat via the third pivot.
  4. 4 . The sofa unfolding device according to claim 1 , wherein the first pivot is configured to be kept above the second pivot.
  5. 5 . The sofa unfolding device according to claim 1 , further comprising a leg rest assembly, wherein the leg rest assembly is connected with the linkage assembly and configured to be unfolded with the unfolding of the linkage assembly; the leg rest assembly is configured to be located above the abutting member of the support mechanism when the linkage assembly is unfolded, a linkage rod is provided between the leg rest assembly and the linkage assembly; the seat comprises a fixed member and a first follower and a second follower provided at both ends of the fixed member, respectively; the first follower and the second follower are rotatably connected with the linkage assembly; the linkage rod is rotatably connected at a first end of the linkage rod with the first follower via a fourth pivot, and rotatably connected at a second end of the linkage rod with the linkage assembly; and both of the first pivot and the second pivot are kept above the fourth pivot.
  6. 6 . The sofa unfolding device according to claim 5 , wherein the support assembly comprises a limiting rod, a push rod, and a connecting rod; the push rod is rotatably connected at a first end of the push rod with the first follower, and the push rod is rotatably connected at a second end of the push rod with a first end of the connecting rod; the connecting rod is rotatably connected at a second end of the connecting rod with the abutting member via the second pivot; and the limiting rod is rotatably connected at a first end of the limiting rod with the fixed member via the third pivot, the limiting rod is rotatably connected at a second end of the limiting rod with the push rod, and a connection pivot between the limiting rod and the push rod is located between the first end of the push rod and the second end of the push rod.
  7. 7 . The sofa unfolding device according to claim 1 , wherein the seat comprises a front part and a side part connected with each other, the second support assembly further comprises a slide part connected with the support part, and the slide part is slidingly connected with the front part and the side part, respectively.
  8. 8 . The sofa unfolding device according to claim 7 , wherein a slide rail is connected on the side part, a first slide block in cooperation with the slide rail is provided on the slide part, and a second slide block in slide cooperation with the slide part is provided on the front part.
  9. 9 . The sofa unfolding device according to claim 7 , wherein a slide joint between the front part and the slide part is located above the slide part.
  10. 10 . The sofa unfolding device according to claim 1 , wherein the support part comprises a support wheel.
  11. 11 . A sofa unfolding device, comprising a seat, a backrest assembly, a linkage assembly, and a leg rest assembly, wherein the linkage assembly is rotatably connected on the seat, the backrest assembly is rotatably connected to a rear end of the seat via the linkage assembly, the leg rest assembly is rotatably connected to a front end of the seat via the linkage assembly, a support mechanism is connected on the front end of the seat and comprises an abutting member and a support member, the abutting member is rotatably connected with the linkage assembly via a first pivot, the support member is rotatably connected with the abutting member via a second pivot and is rotatably connected with the seat via a third pivot, and the abutting member is configured to stretch simultaneously toward a front and a bottom of the seat with unfolding of the linkage assembly and abut against a ground.
  12. 12 . The sofa unfolding device according to claim 11 , wherein the linkage assembly comprises a connecting rod assembly, a first follower and a second follower, the first follower is rotatably connected to the front end of the seat, the second follower is rotatably connected to the rear end of the seat, the connecting rod assembly is rotatably connected with the first follower and the second follower, respectively, the backrest assembly and the leg rest assembly are rotatably connected with the connecting rod assembly, the first follower is configured to be rotated toward the front end of the seat with unfolding of the connecting rod assembly, the abutting member is rotatably connected with the first follower via the first pivot, and the abutting member is configured to stretch simultaneously toward the front and the bottom of the seat with a rotation of the first follower and abut against the ground.
  13. 13 . The sofa unfolding device according to claim 11 , wherein the abutting member is provided with a rolling wheel configured to abut against the ground, the rolling wheel is configured to be located above the seat when the linkage assembly is folded, and to be located in front of the seat when the linkage assembly is unfolded, and a fifth pivot and a sixth pivot are kept above the rolling wheel.
  14. 14 . The sofa unfolding device according to claim 11 , wherein the first pivot is located above the second pivot.
  15. 15 . The sofa unfolding device according to claim 11 , wherein a second support assembly is provided on the seat and configured to slide back and forth along the seat from the rear end of the seat to the front end of the seat, a linkage member is rotatably connected on the second support assembly via a fifth pivot and is rotatably connected with a support assembly via a sixth pivot, the second support assembly is configured to be driven by the linkage member to slide forward when the linkage assembly is unfolded, and the second support assembly comprises a support part located at the front end of the seat.
  16. 16 . The sofa unfolding device according to claim 15 , wherein the seat comprises a front part and a side part connected with each other, the second support assembly further comprises a slide part connected with the support part, and the slide part is slidingly connected with the front part and the side part, respectively.
  17. 17 . The sofa unfolding device according to claim 16 , wherein a slide rail is connected on the side part, a first slide block in cooperation with the slide rail is provided on the slide part, and a second slide block in slide cooperation with the slide part is provided on the front part.
  18. 18 . The sofa unfolding device according to claim 16 , wherein a slide joint between the front part and the slide part is located above the slide part.
  19. 19 . The sofa unfolding device according to claim 15 , wherein the support part comprises a support wheel.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a Continuation-In-Part of U.S. patent application Ser. No. 17/991,874, filed on Nov. 22, 2022. The entirety of U.S. patent application Ser. No. 17/991,874 is hereby incorporated by reference herein and made a part of this specification. FIELD OF THE INVENTION The present application relates to the field of a sofa or a chair, especially to a functional sofa or chair, and in particular to a sofa unfolding device capable of avoiding forward overturning. DESCRIPTION OF RELATED ART In recent years, functional sofas have become more and more popular in the market. The functional sofa refers to an foldable or multi-functional sofa that may be switched among states for sitting, half-lying, and lying by means of an internal foldable iron frame. The iron frames of such sofa are classified as two types: an armrest floor-standing type and an iron frame floor-standing type, each of which has its own advantages in terms of footprint and comfort. The iron frame floor-standing sofa is found to have a hidden danger of overturning forward as a whole during use. The reason for this hidden danger lies in that, there is insufficient contact area between the iron-frame floor-standing sofa and the ground. Therefore, when the user does some actions, the sofa tends to lose its center of gravity during the process of switching the states of the sofa, especially after being switched to a sitting or lying state, and in turn overturns forward as a whole. In order to eliminate the above-mentioned hidden dangers, China Utility Model No. CN209644426U discloses a support structure rotating outwards and touching the ground with the movement of a sofa iron frame. When unfolding the iron frame, this support structure rotates out of the sofa iron frame, and finally presses against the ground, so as to provide an additional support structure for the sofa iron frame. However, this utility model suffers from an apparent defect. That is, when the support structure, which itself is a rigid part, is rotated directly out of the sofa ion frame, if there is a foreign object just positioned at a position where the support structure touches the ground, the support structure in this utility model will not only fail to provide additional support force for the sofa iron frame, but also tend to tilt or lose the center of gravity of the sofa iron frame. BRIEF SUMMARY OF THE INVENTION In view of the problem of losing it center of gravity or instability of an iron sofa frame during unfolding, the present application provide a safe unfolding device that is capable of avoiding forward overturning. In a first aspect, the present application provides a sofa unfolding device capable of avoiding forward overturning, including a backrest assembly, a linkage assembly, and a seat, in which the linkage assembly is provided on the seat; the backrest assembly is rotatably connected with the linkage assembly, a support mechanism is provided at a front end of the linkage assembly, the support mechanism includes an abutting member and a support assembly, is configured to stretch simultaneously forward and downward with unfolding of the linkage assembly and abut against a ground to act as a support structure. The support mechanism includes an abutting member and a support assembly; the abutting member is rotatably connected with the linkage assembly via a first pivot; the support assembly is rotatably connected with the abutting member via a second pivot; and the support assembly is rotatably connected with the seat via a third pivot; and the abutting member is configured to stretch simultaneously forward and downward with unfolding of the linkage assembly and abut against a ground. In particular, the first pivot and the second pivot are configured to be kept at an upper half of the linkage assembly. In some embodiments, a bottom of the abutting member is at a first position when the linkage assembly is in a folded state; the abutting member is at a second position when the linkage assembly is in an unfolded state; and a horizontal distance between the first position and the second position is greater than 100 mm. In some embodiments, the abutting member is rotatably connected at a top thereof with the linkage assembly via the first pivot; a bottom of the abutting member is configured to be a free end and connected with a roller; and the roller is configured to be located above the seat when the linkage assembly is folded and located in front of the seat when the linkage assembly is unfolded. The support assembly includes a support rod body; the support rod body is rotatably connected at a first end thereof with the abutting member via the second pivot; and rotatably connected at a second end thereof with the seat via the third pivot. In some embodiments, the first pivot is configured to be kept above the second pivot. In some embodiments, the described sofa unfolding device further includes a leg rest assembly; wherei