Three-section type sofa bed frame and sofa bed

Abstract

The utility model relates to a sofa bed, in particular to a three-section type sofa bed frame and a sofa bed. An existing sofa bed uses sliding rail transformation, the machining requirement is strict, cost is high, and lubricating oil of the sliding rail pollutes the sliding rail. The three-section type sofa bed frame and the sofa bed comprise a backrest frame and a bed frame, the bed frame can be unfolded / stored, the three-section type sofa bed frame is characterized in that the backrest frame and the bed frame are of a split structure, and the bed frame is formed by vertically stacking an outer frame and an inner frame. The unfolding / folding of the bed frame comprises outward movement and extension / inward movement and retraction of the inner frame relative to the backrest frame and outward movement and extension / inward movement and retraction of the outer frame relative to the inner frame, the bottom of the outer frame is provided with a plurality of rollers capable of touching the ground to bear and lift the bed frame, and when the bed frame is unfolded, a three-section partitioned placement cushion body is formed. After the bed frame is unfolded, the mattress is arranged in three areas, the size of the bed is obviously enlarged, the rolling wheels are used for replacing sliding rails to bear the bed frame, the problem of lubricating oil pollution and cleaning trouble are avoided, the structures of the sofa bed frame and the sofa bed are further simplified after the sliding rails are omitted, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sofa bed, especially a three-section sofa bed frame and sofa bed. BACKGROUND

[0002] The existing sofa bed mainly comprises a sofa bed frame and a matching sofa cushion, the sofa bed frame comprises a backrest frame and a bed frame, the sofa cushion comprises a backrest cushion and a seat cushion, the bed frame is used as a sofa when being stored, and the bed frame is used as a bed when being unfolded. The bed frame of the existing sofa bed is unfolded through a slide rail, the bed frame is mainly supported on the slide rail and moves out or is retracted on the slide rail, the sofa bed frame has a limited unfolding length, the slide rail uses lubricating oil, the lubricating oil drops to cause pollution, dirt on the ground, carpet or other objects, which brings inconvenience to users, increases cleaning trouble, and the slide rail has high manufacturing and processing requirements, which leads to an increase in the production cost of the sofa bed frame. UTILITY MODEL CONTENT

[0003] To solve the technical problems of the existing sofa bed frame with a long slide rail, limited unfolding length, lubrication of the slide rail causing pollution and inconvenience and cleaning burden, and high manufacturing technical requirements of the slide rail leading to an increase in the production cost, the utility model provides a three-section sofa bed frame and sofa bed, the sofa bed frame is in a three-section form after being unfolded, has a larger total length, and the unfolding and extension of the bed frame do not need to use the slide rail, so that there is no lubricating oil pollution problem and the resulting inconvenience and cleaning trouble, the sofa bed structure without the slide rail structure is simpler, and the production cost is obviously reduced. The sofa bed uses the three-section sofa bed frame, the length of the bed frame after being unfolded is increased, the size of the bed is expanded, there is no lubricating oil pollution problem and cleaning trouble in the use of the sofa bed, and the production cost is lower than that of the sofa bed with the slide rail.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows: a three-section sofa bed frame, including a backrest frame and a bed frame, and the bed frame can be unfolded / folded. The backrest frame and the bed frame are separate structures. The bed frame is composed of an outer frame and an inner frame stacked on top of each other. The unfolding / folding of the bed frame includes the outer extension / inner retraction of the inner frame relative to the backrest frame and the outer extension / inner retraction of the outer frame relative to the inner frame. The bottom of the outer frame is provided with multiple ground-reaching rollers to support and lift the bed frame. When the bed frame is unfolded, it forms three sections for placing the cushions. The three sections are the outer section corresponding to the outer frame, the middle section corresponding to the inner frame, and the inner section between the inner frame and the backrest frame. The bed frame and backrest frame of this utility model are separate structures. When unfolded, the bed frame can form three sections—inner, middle, and outer—to accommodate a mattress. The entire bed frame is supported by rollers on the outer frame, eliminating the need for sliding rails and avoiding the lubrication issues associated with sliding rails. This also prevents inconvenience and additional cleaning burdens for users. Furthermore, eliminating sliding rails simplifies the structure and reduces production costs. When the bed frame is not unfolded, the outer and inner frames can be stacked vertically for storage, saving space. When used as a sofa, the bed frame is close to the backrest frame. When used as a bed, the bed frame moves outward relative to the backrest frame, with the inner frame extending outward relative to the backrest frame and the outer frame extending outward relative to the inner frame.

[0005] As a further improvement and supplement to the above technical solution, this utility model adopts the following technical measures: the inner frame is a rectangular frame structure and is hung at the bottom of the outer frame, and the inner frame can move back and forth relative to the suspension point of the outer frame, so that the outer frame can extend outwards / retract inwards relative to the inner frame. The inner frame is a rectangular frame structure, which is movably connected to the bottom of the outer frame by suspension. The rectangular frame can move back and forth relative to the suspension position of the outer frame, so as to realize the extension outwards / retraction inwards of the outer frame relative to the inner frame.

[0006] The outer frame is equipped with hangers on both sides. The two short sides of the rectangular frame pass through the hangers on both sides of the outer frame. When the outer frame moves outward relative to the inner frame, the hangers abut against the outer long side of the rectangular frame to limit the movement of the outer frame. The outer frame moves through the hangers on the left and right sides and the inner frame. The two short sides of the inner frame pass through the corresponding hangers, allowing the short sides to move back and forth relative to the hangers while achieving suspension. The short sides passing through the hangers position the hangers between the two long sides of the rectangular frame. When the outer frame moves outward relative to the inner frame, the hangers abut against the outermost long side, and the outer frame extends the furthest relative to the inner frame. Hangers on both the left and right sides of the outer frame are used to hang the inner frame, guiding and positioning the relative movement between the outer and inner frames. The hangers can be made of high-performance thermoplastic clamping components.

[0007] On each side of the outer frame, there is a row of hanger groups matching the two short sides. Each row of hanger groups includes multiple hangers arranged along the movement direction of the outer frame. There are multiple hangers on each side of the outer frame. The hangers on the same side are arranged in a row along the movement direction of the outer frame to form a hanger group. During the back-and-forth movement of the outer frame relative to the inner frame, each hanger in the hanger group moves back and forth relative to the short side.

[0008] Each end of the backrest frame is connected to an armrest frame. The bed frame is positioned within the space enclosed by the backrest frame and the two armrest frames, the length and width of which are approximately equal to the length and width of the bed frame. The backrest frame and the armrest frames connected to its two ends form a U-shaped space, within which the bed frame is located. The length and width of the space are approximately equal to the length and width of the bed frame, allowing the bed frame to move only towards the opening side of the U-shape. That is, the bed frame can only extend outward relative to the backrest frame or move inward in the opposite direction.

[0009] At least one of the two armrests has a limiting member on its inner side to restrict the outward movement of the bed frame. When the bed frame moves outward relative to the backrest frame, the limiting member abuts against the inner frame. Since there is no connection between the backrest frame and the bed frame, the limiting member abuts against the inner frame to restrict the outward movement of the bed frame relative to the backrest frame, thus limiting the width of the inner area between the bed frame and the backrest frame after the bed frame moves outward and extends, preventing the bed frame from moving too far outward and causing the inner area to be too wide to accommodate a mattress.

[0010] The limiting component is a limiting block fixed to the inside of the armrest frame. One end of the limiting block is fixed to the armrest frame, and the other end extends outward toward the armrest frame on the opposite side. When the bed frame moves outward relative to the backrest frame, the limiting block abuts against the inner long side of the rectangular frame facing the backrest frame. By the limiting block abutting against the inner long side of the rectangular frame, the outward movement of the rectangular frame is prevented, thus limiting the inner frame and consequently limiting the outward movement of the bed frame. When the inner long side abuts against the limiting block, the bed frame also moves outward to its maximum travel distance.

[0011] Each of the two armrest frames has a limiting block fixed to its inner side. When the bed frame moves outward relative to the backrest frame, the two limiting blocks abut against the two ends of the inner long side. The two limiting blocks work together to abut against the two ends of the inner long side, preventing the inner frame from moving outward. Compared to having only one limiting block fixed on one armrest frame, this method has a better effect on limiting the outward movement of the bed frame.

[0012] The outer frame is a flat frame or plate, with hanging brackets on both sides of the bottom surface and casters at the four corners of the bottom surface. The outer frame can also be a simple flat frame or plate, as long as it has mounting positions for the hanging brackets and casters.

[0013] The second objective of this invention is to provide a sofa bed, comprising a sofa bed frame and matching cushions and a support frame. The cushions include a backrest cushion and a seat cushion, with the seat cushion mounted on the support frame. The sofa bed frame is characterized by being a three-section sofa bed frame as described above. The support frame is located on either side or above the bed frame, and the bed frame can be unfolded / folded up from below the seat cushion. Using the aforementioned three-section sofa bed frame increases the length of the unfolded bed, further expanding its size. Without guide rails, there are no issues with lubricant contamination or cleaning, and production costs are further reduced. The seat cushion, mounted on the support frame and separated from the bed frame, does not interfere with the unfolding or folding of the bed frame.

[0014] The beneficial technical effects of this utility model are as follows: After the bed frame is unfolded, it forms three sections—inner, middle, and outer—to accommodate the mattress, increasing the bed's planar dimensions. The entire bed frame is supported and lifted by rollers on its outer frame, eliminating the need for sliding rails and avoiding the lubrication issues associated with them. This reduces inconvenience and extra cleaning burden for users. The elimination of sliding rails simplifies the sofa bed frame structure and lowers production costs. Sofa beds using a three-section sofa bed frame eliminate lubrication contamination and cleaning problems, and feature a simple structure and low cost. Attached Figure Description

[0015] Figure 1 Example 1: Schematic diagram of the bed frame unfolding and matching pad.

[0016] Figure 2 Example 1: Schematic diagram of the sofa bed frame.

[0017] Figure 3 : Figure 2 The bottom view.

[0018] Figure 4 : Figure 3 Enlarged view of part A.

[0019] Figure 5 : Figure 3 Enlarged view of part B.

[0020] Figure 6 Example 1: A schematic diagram of the internal frame structure.

[0021] Figure 7 : Figure 6 Enlarged view of part C.

[0022] Figure 8 Example 2: Schematic diagram of the sofa bed.

[0023] Figure 9 Example 2: Schematic diagram of the support frame above the bed frame.

[0024] In the diagram: 1. Backrest frame, 2. Bed frame, 2-1. Outer frame, 2-2. Inner frame, 2-21. Short side, 2-22. Outer long side, 2-23. Inner long side, 2-3. Upper support surface, 2-4. Upright, 3. Roller, 4. Inner zone, 5. Middle zone, 6. Outer zone, 7. Hanging bracket, 8. Armrest frame, 9. Limiting component, 10. Backrest cushion, 11. Seat cushion, 12-1. Supporting vertical plate, 12-2. Supporting flat plate, 13. Cushion body. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] likeFigures 1-7 As shown, Embodiment 1 is a three-section sofa bed frame, including a backrest frame 1 and a bed frame 2. The bed frame 2 can be unfolded and extended or retracted. The backrest frame 1 and the bed frame 2 are separate structures. The bed frame 2 is formed by stacking an outer frame 2-1 and an inner frame 2-2. The bed frame 2 can be extended outward or retracted inward relative to the backrest frame 1. The outer frame 2-1 can be extended outward or retracted inward relative to the inner frame 2-2. The bottom of the outer frame 2-1 is provided with multiple ground-reaching rollers 3 to support and lift the bed frame 2. When the bed frame 2 is unfolded, it forms three sections for placing the cushions 13. The three sections are the outer section 6 corresponding to the outer frame 2-1, the middle section 5 corresponding to the inner frame 2-2, and the inner section 4 between the inner frame 2-2 and the backrest frame 1.

[0027] Because the bed frame and backrest frame are separate structures, when the bed frame is unfolded, it forms three sections as shown in the diagram to accommodate the mattress. Specifically, the inner section corresponds to the area between the extended bed frame and the backrest frame; the middle section corresponds to the portion of the inner frame that is exposed after the outer frame extends relative to the inner frame; and the outer section corresponds to the portion of the extended outer frame that is exposed. The entire bed frame is supported by casters on the outer frame, eliminating the need for specially designed long slide rails. This avoids the lubrication issues associated with slide rails, preventing oil stains and cleaning burdens for users. Eliminating slide rails further simplifies the structure of the sofa bed frame and reduces production costs. When the bed frame is not unfolded, the outer and inner frames can be stacked vertically for storage, saving space. When used as a sofa, the bed frame is placed next to the backrest frame; when used as a bed, the bed frame extends outward relative to the backrest frame, and the outer frame also extends outward relative to the inner frame.

[0028] Furthermore, as shown in the figure, the inner frame 2-2 has a rectangular frame structure and is hung at the bottom of the outer frame 2-1. The inner frame 2-2 can move back and forth relative to the suspension point of the outer frame 2-1, allowing the outer frame 2-1 to extend outwards / retract inwards relative to the inner frame 2-2. Multiple hangers 7 are arranged in a row along the moving direction of the outer frame 2-1 on both sides of the outer frame 2-1. In this embodiment, there are two hangers 7 on each side. The two short sides 2-21 of the rectangular frame pass through the hangers 7 on both sides of the outer frame 2-1. In this embodiment, the hangers 7 are preferably U-shaped clamping components with both ends fixed to the bottom surface of the outer frame 2-1. The clamping components are made of POM material, which is a high-performance thermoplastic. The short sides of the rectangular frame pass through the U-shaped openings of the clamping components and rest on the hangers. When the outer frame 2-1 moves into position relative to the inner frame 2-2, the hanger 7 abuts against the outer long side 2-22 of the rectangular frame to limit the movement of the outer frame 2-1. The hanger uses a plastic clamping component, which reduces the impact of the hanger against the outer long side 2-22 each time it abuts. Furthermore, this plastic material has excellent abrasion resistance, preventing problems caused by frequent friction between the outer and inner frames. The short side 2-21 of the rectangular frame is preferably a galvanized metal round tube.

[0029] The rectangular frame serving as the inner frame is suspended and movably connected to the bottom of the outer frame. The rectangular frame can move back and forth relative to the suspension position of the outer frame, allowing the outer frame to extend outwards and retract inwards relative to the inner frame. When the outer frame moves outwards relative to the inner frame into position, the hanger abuts against the outermost long side, and the outer frame extends to its furthest point relative to the inner frame. Hangers are provided on both the left and right sides of the outer frame to hold the inner frame, guiding and positioning the relative movement between the outer and inner frames. During the back-and-forth movement of the outer frame relative to the inner frame, the two hangers also move back and forth relative to their short sides.

[0030] Furthermore, each end of the backrest frame 1 is connected to an armrest frame 8. The bed frame 2 is located in the gap formed by the backrest frame 1 and the two armrest frames 8, and the length and width of the gap are approximately the same as the length and width of the bed frame 2. At least one of the two armrest frames 8 has a limiting member 9 on its inner side to restrict the outward movement of the bed frame 2. When the bed frame 2 moves outward relative to the backrest frame 1, the limiting member 9 abuts against the inner frame 2-2. In this embodiment, it is preferable that both armrest frames 8 have limiting members 9 on their inner sides to restrict the outward movement of the bed frame 2. The limiting member 9 is a limiting block fixed to the inner side of the armrest frame 8. One end of the limiting block is fixed to the armrest frame, and the other end extends outward toward the armrest frame 8 on the opposite side. When the bed frame 2 moves outward relative to the backrest frame 1, the limiting block abuts against the inner long side 2-23 of the rectangular frame facing the backrest frame 1. Specifically, the two limiting blocks abut against the two ends of the inner long side 2-23 respectively.

[0031] The backrest frame and the two armrest frames connected to its ends form a U-shaped gap. The bed frame is located within this U-shaped gap, the length and width of which are roughly the same as the length and width of the bed frame. The bed frame's movement is restricted; it can only move towards the opening of the U-shape. Specifically, the bed frame can only extend outward relative to the backrest frame or move inward inward. During operation, the limiting blocks abut against the inner long side of the rectangular frame, preventing the rectangular frame from moving outward and limiting the outward movement of the bed frame relative to the backrest frame. This outward movement is also the width of the inner area between the bed frame and the backrest frame after the bed frame extends outward, preventing the bed frame from moving too far outward and making the inner area too wide to accommodate a mattress. When the inner long side abuts against the limiting blocks, the bed frame has moved outward to its maximum range. At this point, the two limiting blocks cooperate to abut against both ends of the inner long side, preventing the inner frame from moving further outward and limiting its movement.

[0032] Furthermore, the outer frame 2-1 is a planar frame or plate, with hangers 7 provided on both sides of the bottom surface of the frame or plate, and rollers 3 provided at the four corners of the bottom surface. The outer frame can be a simple planar frame or plate made by welding four rods, as long as there are installation positions for hangers and rollers. In this embodiment, a plate is preferred for the outer frame.

[0033] like Figures 8-9 As shown, Embodiment 2 is a sofa bed, including a sofa bed frame, a matching cushion body 13, and a support frame. The cushion body 13 includes a backrest cushion 10 and a seat cushion 11. The seat cushion 10 is mounted on the support frame, and the seat cushion 11 is as follows:Figure 1 The sofa bed frame shown can be rotated open to become two movable, connected cushions. The sofa bed frame is the three-section sofa bed frame described in Embodiment 1. The frame also includes an upper support surface 2-3 located above the outer frame 2-1. The upper support surface 2-3 is the upper surface of a horizontal plate, which is supported on the outer frame 2-1 by uprights 2-4. The horizontal plate is lower than the support frame, and the horizontal plate and upper support surface can move back and forth with the outer frame. The support frame is located on both sides or above the bed frame 2. The bed frame 2 can be unfolded / folded up under the seat cushion 11. Figure 9 As shown, in this embodiment, the support frame is a support plate 12-2 located above the bed frame 2. As shown, the support plate 12-2 is fixed between the two armrest frames 8, with both ends of the support plate fixed to the two armrest frames. The seat cushion rests on the support plate. The support frame can also be located on both sides of the bed frame 2, as shown in the figure. Figure 1 The support frame shown is a support vertical plate 12-1 fixed to the inner surface of the two armrest frames 8. The top edge of the two support vertical plates can be used to support the seat cushion. Both support frame structures can separate the seat cushion from the bed frame, allowing the bed frame 2 to be moved and unfolded / stored under the seat cushion 11. When the sofa bed is used as a sofa, the sofa bed frame is not unfolded, the seat cushion is placed next to the backrest frame on the support plate, and the backrest cushion is placed next to the backrest frame on the seat cushion. When the sofa bed is used as a bed, the sofa bed frame is unfolded, the seat cushion rotates and opens into two cushions, supported by the support plate and the upper support surface. The two cushions have different thicknesses to compensate for the height difference between the support plate and the upper support surface. The backrest cushion is also laid flat on the support plate next to the backrest frame.

[0034] The sofa bed uses the three-section sofa bed frame in Example 1. The size of the bed frame increases after it is unfolded. The entire bed frame is supported by rollers set on the outer frame, eliminating the need for slide rails. This avoids lubricant pollution caused by slide rails, and does not bring inconvenience or extra cleaning burden to users. Moreover, the elimination of slide rails simplifies the structure and further reduces production costs.

Claims

1. A three-section sofa bed frame comprising a backrest frame (1) and a bed frame (2), and the bed frame (2) is expandable / stowable, characterized in that The backrest frame (1) and the bed frame (2) are in a split structure, the bed frame (2) is formed by the upper and lower stacking of the outer frame (2-1) and the inner frame (2-2), the unfolding / storage of the bed frame (2) includes the outward movement / retraction of the inner frame (2-2) relative to the backrest frame (1) and the outward movement / retraction of the inner frame (2-2) relative to the outer frame (2-1), the bottom of the outer frame (2-1) is provided with a plurality of touchable rollers (3) to carry and hold the bed frame (2), and the bed frame (2) is unfolded to form three sectioned placement cushion bodies (13), and the three sections are the outer area (6) corresponding to the outer frame (2-1), the middle area (5) corresponding to the inner frame (2-2), and the inner area (4) between the inner frame (2-2) and the backrest frame (1).

2. The three-section sofa bed frame of claim 1, wherein The inner frame (2-2) is in a rectangular frame structure and is hung at the bottom of the outer frame (2-1), and the inner frame (2-2) can move back and forth relative to the hanging position of the outer frame (2-1), so that the outer frame (2-1) moves outward / retracts inward relative to the inner frame (2-2).

3. The three-section sofa bed frame of claim 2, wherein The outer frame (2-1) is provided with a hanging frame (7) on both sides, and the two short sides (2-21) of the rectangular frame pass through the hanging frames (7) on both sides of the outer frame (2-1), and when the outer frame (2-1) is outwardly positioned relative to the inner frame (2-2), the hanging frames (7) abut against the outer long side (2-22) of the rectangular frame to limit the outer frame (2-1).

4. The three-section sofa bed frame of claim 3, wherein Each of the two sides of the outer frame (2-1) has a column of hanging frame groups matching the two short sides (2-21), and each column of hanging frame groups includes a plurality of hanging frames (7) arranged in the movement direction of the outer frame.

5. The three-section sofa bed frame of claim 2, wherein The two ends of the backrest frame (1) are respectively connected with an armrest frame (8), and the bed frame (2) is arranged in the empty block surrounded by the backrest frame (1) and the two armrest frames (8), and the length and width of the empty block are equivalent to the length and width of the bed frame (2).

6. The three-section sofa bed frame of claim 5, wherein At least one of the two armrest frames (8) is provided with a limiting member (9) on the inner side thereof to limit the outward movement stroke of the bed frame (2), and when the bed frame (2) is outwardly positioned relative to the backrest frame (1), the limiting member (9) abuts against the inner frame (2-2).

7. The three-section sofa bed frame of claim 6, wherein The limiting member (9) is a limiting block fixed on the inner side of the armrest frame (8), one end of the limiting block is fixedly connected with the armrest frame, and the other end extends outwardly towards the armrest frame (8) on the opposite side, and when the bed frame (2) is outwardly positioned relative to the backrest frame (1), the limiting block abuts against the inner long side (2-23) of the rectangular frame on the side of the backrest frame (1).

8. The three-section sofa bed frame of claim 7, wherein The inner sides of the two armrest frames (8) are respectively fixed with a limiting block, and when the bed frame (2) is outwardly positioned relative to the backrest frame (1), the two limiting blocks respectively abut against the two ends of the inner long side (2-23).

9. The three-section sofa bed frame of claim 1, wherein The outer frame (2-1) is a planar frame or a plate member, the bottom surface of the frame or plate member is provided with hanging frames (7) on both sides, and the frame or plate member is provided with rollers (3) in the four corner regions of the bottom surface.

10. A sofa bed comprising a sofa bed frame and a matching cushion (13) and support frame, said cushion (13) comprising a backrest cushion (10) and a seat cushion (11), the seat cushion (11) being mounted on the support frame, characterized in that The sofa bed frame is a three-section sofa bed frame according to any one of claims 1-9, the support frame is arranged on both sides of the bed frame (2) or above the bed frame (2), and the bed frame (2) can be unfolded / stored under the seat cushion (11).

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