A sofa folding bed
By designing a linkage mechanism-driven middle frame, front frame, and rear frame structure, the problems of insufficient length and complex operation of existing three-person folding sofa beds are solved, enabling them to be used by tall people and simplifying the conversion process.
Patent Information
- Application Number
- CN202522185754.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-06-02
- Estimated Expiration
- 2035-10-16
AI Technical Summary
The existing three-person folding sofa bed has an insufficient length of mattress frame when unfolded to meet the needs of taller people, and the process of turning a sofa into a bed or a bed into a sofa is complicated and difficult to operate.
A sofa folding bed structure including a middle frame, a front frame, and a rear frame was designed. The frame can be extended, retracted, raised, and lowered through a linkage mechanism. The middle frame extends forward, the rear frame lies flat on the base, the front frame slides out and is flush with the middle frame, and the cushion moves with the frame, simplifying operation.
It achieves an unfolded length suitable for taller individuals, is simple and quick to operate, eliminates the hassle of repeatedly moving the mat, and makes the conversion process more convenient.
Smart Images
Figure CN224307048U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of furniture technology, and in particular relates to a sofa folding bed. Background Technology
[0002] Currently, to cater to families with smaller living spaces, the market offers some three-seater folding sofas that can be unfolded and used as beds. However, most of these sofas have a mattress frame designed to be flipped and folded. To turn the sofa into a bed, you need to remove the folded sofa cushions, flip the mattress frame, and then lay the unfolded sofa cushions on top. The drawbacks are: firstly, the unfolded length of the mattress frame is insufficient for taller people; and secondly, the conversion process from sofa to bed or bed to sofa is complicated and difficult to operate. Summary of the Invention
[0003] The purpose of this invention is to provide a sofa folding bed that has a large unfolded length and is simple and convenient to operate.
[0004] The purpose of this utility model is to solve the following problem:
[0005] A sofa folding bed includes armrests on both sides and a base on the lower rear side. A middle frame slides between the two armrests, and a front frame slides inside the middle frame. A rectangular rear frame is hinged to the upper rear end of the middle frame. One or more first connecting rods are hinged at one end to the base and at the other end to the middle of the rear frame. The front frame includes an outer frame and a small rectangular frame that can be raised, lowered, and rotated within the outer frame. When the sofa folding bed is adjusted to a bed position, the middle frame extends forward, and the first connecting rods drive the rear frame to rotate until the rear crossbeam of the rear frame is flattened and overlaps the base. The front frame slides forward to the front of the middle frame, and the small frame rises to be flush with the upper surface of the middle frame. When the sofa folding bed is adjusted to a sofa position, the small frame lowers and slides into the middle frame along with the front frame. The small frame retracts backward with the middle frame, and the first connecting rods drive the rear frame to rotate, raising the rear part of the rear frame to form a sofa backrest.
[0006] As a further optimization of the above technical solution, the rear frame includes a rectangular outer frame and two or more longitudinal first rods fixedly connected within the outer frame, which are arranged laterally at intervals. The other end of the first rod is respectively hinged to the middle of the first rod.
[0007] As a further optimization of the above technical solution, the middle frame includes a rectangular upper frame and a rectangular lower frame. The four corresponding corners of the upper and lower frames are fixedly connected by four columns, and the lower ends of the four corners of the lower frame are provided with rollers.
[0008] As a further optimization of the above technical solution, two or more longitudinal second rods are fixedly connected inside the upper frame of the middle frame, and the front end of the rear frame is hinged to the rear crossbeam of the upper frame of the middle frame.
[0009] As a further optimization of the above technical solution, pads are installed on the small frames of the rear frame, middle frame, and front frame.
[0010] As a further optimization of the above technical solution, the two side beams of the small frame of the front frame are respectively hinged to one end of the front second link and the rear third link through the connecting frame. The other ends of the two second links are respectively hinged to the front part of the two side beams of the outer frame of the front frame. The other ends of the two third links are respectively hinged to one end of the fourth link. The other ends of the two fourth links are respectively hinged to the middle part of the two side beams of the outer frame of the front frame. The lower middle part of the two third links is respectively hinged to one end of the fifth link. The other ends of the two fifth links are respectively hinged to the rear part of the two side beams of the outer frame of the front frame. The lower part of the third link is bent to the rear, and one end of the fifth link is hinged at the bend.
[0011] As a further optimization of the above technical solution, rollers are respectively provided at the lower ends of the four corners of the outer frame of the front frame.
[0012] As a further optimization of the above technical solution, one or more horizontal plates are provided on the upright plate of the front crossbeam of the outer frame of the front frame.
[0013] As a further optimization of the above technical solution, the front part of the inner sidewall of the handrail on both sides is provided with a first guide block with a guide hole, and the first guide rod fixed on the two side beams of the lower frame of the middle frame slides in the first guide hole of the first guide block.
[0014] As a further optimization of the above technical solution, the front part of the inner wall of the two side beams of the lower frame of the middle frame is provided with a second guide block with a second guide hole, and the second guide rods fixed on the two side beams of the outer frame of the front frame are slidably disposed in the second guide hole of the second guide block.
[0015] The advantages of this invention compared to the prior art are:
[0016] 1. When unfolded, the rear frame, middle frame, and front frame of this utility model are relatively long, which can meet the needs of taller people.
[0017] 2. During the unfolding or retraction of this utility model, the pads on the rear frame, middle frame, and front frame move together with the extension, retraction, lifting, and lowering of the small frame, middle frame, and rear frame, eliminating the hassle of repeatedly moving and transporting the pads.
[0018] 3. The conversion of this utility model from a sofa to a bed or from a bed to a sofa is simple, convenient, quick, and easy to operate. Attached Figure Description
[0019] Figure 1 This is a three-dimensional schematic diagram of the utility model in its use state as a sofa with the front facing upwards.
[0020] Figure 2 This is a three-dimensional schematic diagram of the utility model in use as a sofa with the back facing forward.
[0021] Figure 3 This is a three-dimensional schematic diagram of the front frame of this utility model.
[0022] Figure 4 This is a three-dimensional schematic diagram of the utility model in its use as a bed.
[0023] Figure 5 This is a three-dimensional schematic diagram of the utility model in use as a sofa with the small frame in the process of rotation. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figures 1-5 :
[0025] A sofa folding bed includes armrests 10 on both sides and a base 20 on the lower rear side. A middle frame 40 is slidably arranged between the two armrests 10, and a front frame 50 is slidably arranged inside the middle frame 40. A rectangular rear frame 30 is hinged to the upper rear end of the middle frame 40. One or more (e.g., two or three) first connecting rods 61 are hinged at one end to the base 20 and at the other end to the middle of the rear frame 30. The front frame 50 includes an outer frame 53 and a small rectangular frame 56 that is height-adjustable and rotatable disposed within the outer frame 53. When the sofa folding bed is adjusted to the use state of a bed, The middle frame 40 extends forward, and the first connecting rod 61 drives the rear frame 30 to rotate until the rear crossbeam 31 of the rear frame 30 is flattened and overlaps the upper surface of the base 20. The front frame 50 slides forward to the front of the middle frame 40, and the small frame 56 rises to be flush with the upper surface of the middle frame 40. When the sofa folding bed is adjusted to the use state of a sofa, the small frame 56 is lowered and slides into the middle frame 40 along with the front frame 50. The small frame 56 retracts backward with the middle frame 40, and the first connecting rod 61 drives the rear frame 30 to rotate so that the rear part of the rear frame 30 is raised to form a sofa backrest.
[0026] As a further optimization of the above technical solution, the rear frame 30 includes a rectangular outer frame and two or more longitudinal first rods 32 that are fixedly connected in the outer frame and are arranged laterally at intervals. The other end of the first connecting rod 61 is respectively hinged to the middle of the first rod 32.
[0027] As a further optimization of the above technical solution, the middle frame 40 includes a rectangular upper frame 41 and a rectangular lower frame 43. The four corresponding corners of the upper and lower frames 41 and 43 are fixedly connected by four columns. Rollers 46 are provided at the lower ends of the four corners of the lower frame 43.
[0028] As a further optimization of the above technical solution, two or more longitudinal second rods 42 are fixedly connected inside the upper frame 41 of the middle frame 40, which are arranged laterally; the front end of the rear frame 30 is hinged to the rear crossbeam 44 of the upper frame 41 of the middle frame 40 through a hinge 34.
[0029] As a further optimization of the above technical solution, pads are installed on the small frames 56 of the rear frame 30, the middle frame 40, and the front frame 50.
[0030] As a further optimization of the above technical solution, the two side beams of the small frame 56 of the front frame 50 are respectively hinged to one end of the front second link 62 and the rear third link 63 via connecting brackets 66. The other ends of the two second links 62 are respectively hinged to the front part of the two side beams of the outer frame 53 of the front frame 50. The other ends of the two third links 63 are respectively hinged to one end of the fourth link 64. The other ends of the two fourth links 64 are respectively hinged to the middle part of the two side beams of the outer frame 53 of the front frame 50. The lower middle part of the two third links 63 is respectively hinged to one end of the fifth link 65. The other end of the rod 65 is hinged to the rear of the two side beams of the outer frame 53 of the front frame 50. The lower part of the third link 63 is bent to the rear, and one end of the fifth link 65 is hinged to the bend. The five-bar linkage constructed by the two side beams of the small frame 56, the second link 62, the third link 63, the fourth link 64, and the two side beams of the outer frame 53 can realize the flattening, tilting, and lifting of the small frame 56 with the cooperation of the fifth link 65. Due to the joint action of the five-bar linkage with the fifth link 65, the flattened and tilted positions of the small frame 56 can be kept in a relatively stable working state.
[0031] As a further optimization of the above technical solution, rollers 54 are respectively provided at the lower ends of the four corners of the outer frame 53 of the front frame 50 to facilitate the front frame 50 to slide back and forth.
[0032] As a further optimization of the above technical solution, one or more horizontal plates 55 are provided on the upright plate 57 of the front crossbeam 57 of the outer frame 53 of the front frame 50.
[0033] As a further optimization of the above technical solution, the front part of the inner sidewall of the handrail 10 on both sides is provided with a first guide block 45 with a guide hole, and the first guide rod 43 fixed on the two side beams of the lower frame 43 of the middle frame 40 is slidably disposed in the first guide hole of the first guide block 45.
[0034] As a further optimization of the above technical solution, the front part of the inner wall of the two side beams of the lower frame 43 of the middle frame 40 is provided with a second guide block 51 with a second guide hole, and the second guide rod 52 fixed on the two side beams of the outer frame 53 of the front frame 50 is slidably disposed in the second guide hole of the second guide block 51.
[0035] Use of this utility model:
[0036] 1. This utility model can be used as a bed instead of a sofa: Pull the front frame 50 forward, and the front frame 50, middle frame 40, and rear frame 30 will move forward in a coordinated manner until the rear frame 30 is placed flat on the base 20. Then, pull the small frame 56 to tilt it up or tilt it up and then flatten it, so that it is flush with the upper surfaces of the middle frame 40 and the rear frame 30, so that it can be used as a bed. The cushions installed on the upper surfaces of the small frame 56, middle frame 40, and rear frame 30 move together with the extension, retraction, lifting and lowering of the small frame 56, middle frame 40, and rear frame 30, eliminating the trouble of repeatedly moving and carrying the cushions.
[0037] 2. To change the usage state of this utility model from a bed to a sofa: First, pull down the small frame 56 so that it is placed flat inside the front frame 50. Then push the front frame 50 backward. The front frame 50 drives the middle frame 40 and the rear frame 30 to move backward in conjunction until the front frame 50 enters the middle frame 40 and the rear frame 30 tilts and lifts under the action of the first connecting rod 61 to become the sofa backrest state.
[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that simple substitutions or modifications can still be made to the technical solutions or technical features described in the foregoing embodiments, and these simple substitutions or modifications do not cause the essence of the corresponding technical solutions to deviate from the spirit and substance of the technical solutions of the embodiments of this utility model, and are still within the protection scope of this utility model.
Claims
1. A sofa folding bed, comprising armrests on both sides and a base on the lower rear side, characterized in that: A middle frame slides between the two armrests, and a front frame slides inside the middle frame. A rectangular rear frame is hinged to the upper rear end of the middle frame. One or more first connecting rods are hinged at one end to the base and at the other end to the middle of the rear frame. The front frame includes an outer frame and a small rectangular frame that can be raised, lowered, and rotated inside the outer frame. When the sofa folding bed is adjusted to the bed mode, the middle frame extends forward, and the first connecting rod drives the rear frame to rotate until the rear crossbeam of the rear frame is flattened and overlaps the base. The front frame slides forward to the front of the middle frame, and the small frame rises to be flush with the upper surface of the middle frame. When the sofa folding bed is adjusted to the sofa mode, the small frame lowers and slides into the middle frame along with the front frame. The small frame retracts backward with the middle frame, and the first connecting rod drives the rear frame to rotate so that the rear part of the rear frame is raised to form a sofa backrest.
2. A sofa folding bed according to claim 1, characterized in that: The rear frame includes a rectangular outer frame and two or more longitudinal first rods fixedly connected within the outer frame, which are arranged laterally at intervals. The other end of each first rod is hinged to the middle of the first rod.
3. A sofa folding bed according to claim 1, characterized in that: The middle frame includes a rectangular upper frame and a rectangular lower frame. The four corresponding corners of the upper and lower frames are fixedly connected by four columns. Rollers are provided at the lower ends of the four corners of the lower frame.
4. A sofa folding bed according to claim 3, characterized in that: The upper frame of the middle frame is fixedly connected with two or more longitudinal second rods that are arranged laterally at intervals, and the front end of the rear frame is hinged to the rear crossbeam of the upper frame of the middle frame.
5. A sofa folding bed according to claim 1, characterized in that: Pads are installed on the small frames of the rear frame, middle frame, and front frame.
6. A sofa folding bed according to claim 1, characterized in that: The two side beams of the small frame of the front frame are respectively hinged to one end of the second link on the front side and one end of the third link on the rear side via connecting frames. The other ends of the two second links are respectively hinged to the front part of the two side beams of the outer frame of the front frame. The other ends of the two third links are respectively hinged to one end of the fourth link. The other ends of the two fourth links are respectively hinged to the middle part of the two side beams of the outer frame of the front frame. The lower middle part of the two third links is respectively hinged to one end of the fifth link. The other ends of the two fifth links are respectively hinged to the rear part of the two side beams of the outer frame of the front frame. The lower part of the third link is bent to the rear side, and one end of the fifth link is hinged to the bend.
7. A sofa folding bed according to claim 1, characterized in that: Rollers are provided at the lower ends of the four corners of the outer frame of the front frame.
8. A sofa folding bed according to claim 1, characterized in that: The front crossbeam of the outer frame of the front frame has one or more horizontal plates on its upward-facing vertical plate.
9. A sofa folding bed according to claim 3, characterized in that: The front part of the inner sidewall of the handrail on both sides is provided with a first guide block with a guide hole, and the first guide rod fixed on the two side beams of the lower frame of the middle frame slides in the first guide hole of the first guide block.
10. A sofa folding bed according to claim 3, characterized in that: The lower frame of the middle frame is provided with a second guide block with a second guide hole at the front part of the inner wall of both sides of the lower frame. The second guide rods fixed on both sides of the outer frame of the front frame are slidably disposed in the second guide hole of the second guide block.