Sofa bed

Patent metadata

Field	Value
Publication number	US-12220058-B2
Application number	US-202217732251-A
Country	US
Kind code	B2
Filing date	Apr 28, 2022
Priority date	Apr 29, 2021
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A sofa bed has a seat portion, a backrest portion and a hinge mechanism including a first section, a second section and a third section sequentially and pivotably connected. The first section is fixed to a side of the seat portion. The second section is fixed to a side of the backrest portion. A protruding portion is provided at a position where the first section is connected with the second section. Each of the armrest frames is formed with a slideway for receiving and guiding the protruding portion. An end of the third section opposite to the second section is pivotally connected to the armrest. The first section and the second section are be lockable to place the main body frame into a sofa configuration. The sofa bed can be easily switched between sofa and bed positions.

First claim

I claim:

1. A sofa bed, comprising:
a plurality of elastic modules each comprising a conical spring and a spring bracket holding the conical spring;
a main body frame formed with a plurality of slide rails configured to engage with a bottom portion of the spring bracket so that the plurality of elastic modules can slide on the slide rails;
an armrest frame on both sides of the main body;
the main body frame configured to be folded along a fold-in-half line perpendicular to an extending direction of the slide rail so as to switch between a folded state and an in-use state, the slide rail forming a slide rail opening at the fold-in-half line when the main body frame is in the folded state, and the slide rail opening closed when the main body frame is in the in-use state;
the slide rails on the main body frame configured such that when the main body frame is in the folded state, the plurality of elastic modules can be mounted on the slide rails from an outer side of the main body frame via the slide rail openings and slide toward ends of the slide rails, the plurality of elastic modules arranged on a front side of the main body frame facing when in the folded state.

2. The sofa bed according to claim 1 wherein the main body frame comprises a rectangular structure, and the slide rails extend in a longitudinal direction of the main body frame.

3. The sofa bed according to claim 2 wherein the fold-in-half line is located at a middle position in the longitudinal direction of the main body frame.

4. The sofa bed according to claim 3 wherein the slide rails are adapted to mount an even number of the elastic modules.

5. The sofa bed according to claim 2 wherein the fold-in-half line is offset from a middle position in the longitudinal direction of the main body frame.

6. The sofa bed according to claim 5 wherein the slide rails are adapted to mount an odd number of the elastic modules, and after the main body frame is folded along the fold-in-half line, the number of elastic modules that can be mounted at most on each side rail of a first portion of two portions of the main body frame which are folded in half is one larger than the number of elastic modules that can be mounted at most on each side rail of a second portion of the two portions.

7. The sofa bed according to claim 2 wherein the main body frame comprises at least two folded portions, each of which comprises:
a unit frame;
a plurality of parallel rail beams extending between two transversely extending beams of the unit frame, each adjacent pair of the rail beams forming the slide rail;
wherein in any two folded portions adjacent in the longitudinal direction among the at least two folded portions, a respective transversely extending beams abut against each other and are pivotable relative to each other about a transversely-extending axis to achieve the folding of the two adjacent folded portions towards each other.

8. The sofa bed according to claim 1 wherein the spring bracket of each of the elastic modules comprises a base having a spring mounting seat for fixing an end of the conical spring.

9. The sofa bed according to claim 1 wherein the spring bracket of each of the elastic modules further comprises:
an end cap disposed opposite to a corresponding spring mounting seat and cooperating with the corresponding spring mounting seat to hold the conical spring, wherein the end cap abuts against the other end of the conical spring opposite to an end of the conical spring fixed in the spring mounting seat; and
one or more sets of flexible straps, each set of flexible straps including a plurality of flexible straps spaced from one another and evenly arranged between a corresponding pair of the spring mounting seat and end cap, the flexible straps being located outside the conical spring when the one conical spring is retained between the corresponding pair of the spring mounting seat and end cap.

10. The sofa bed according to claim 1 wherein each of the elastic modules further comprises a cover covering the conical spring of the elastic module.

11. The sofa bed according to claim 1 wherein the conical spring is mounted in the spring bracket with a predetermined initial compressive force.

12. The sofa bed according to claim 7 wherein the main body frame comprises a seat portion and a backrest portion disposed adjacently in a transverse direction, and the seat portion and the backrest portion are configured to be folded and flattened about a hinge mechanism, thereby allowing the main body frame to switch between a bed configuration and a sofa configuration;
wherein the seat portion and the backrest portion each comprise at least two folded portions arranged in the longitudinal direction.

13. The sofa bed according to claim 12 wherein each of the armrest frames is formed with a slideway facing the hinge mechanism, so that movement of the hinge mechanism is guided by the hinge mechanism;
wherein the sofa bed is configured to lock the backrest portion relative to the seat portion at a predetermined angle when the backrest portion and the seat portion pivot relative to each other about the hinge mechanism, and the armrest frame is connected with the main body frame through the hinge mechanism, so that in a locked state, a partial structure of the hinge mechanism can move the main body frame to guided by the slideway.

14. The sofa bed according to claim 13 wherein the hinge mechanism comprises:
a seat portion connecting rod attached to a transverse side edge of the seat portion and extending along the transverse side edge;
a backrest portion connecting rod attached to a transverse edge of the backrest portion on the same side as the transverse side edge of the seat portion and extending along the transverse edge of the backrest portion;
a pivot connecting the seat portion connecting rod with the backrest portion connecting rod such that the backrest portion and the seat portion can pivot relative to each other.

Assignees

• New Tec Integration Xiamen Co Ltd

Inventors

• Leng Luhao

Classifications

• A47C7/027

  with elastomeric springs (A47C7/282 takes precedence) · CPC title

• A47C7/54

  Supports for the arms · CPC title

• A47C23/002

  with separate resilient support elements, e.g. elastomeric springs arranged in a two-dimensional matrix pattern · CPC title

• A47C19/021

  Bedstead frames · CPC title

• A47C19/12

  Folding bedsteads · CPC title