Sofa structure with backrest capable of being put down

Abstract

The utility model belongs to the technical field of furniture, and particularly relates to a sofa structure with a backrest capable of being put down. The sofa comprises an armrest plate, a seat plate and a backrest, and further comprises a mounting hole channel formed in the backrest, a fixed shaft which is arranged on the armrest plate and is inserted into the mounting hole channel, a tensile rod unit arranged on the armrest plate, and a tensile frame body unit arranged on the lower surface of the seat plate, and the sliding bottom frame unit is arranged on the tensile rod unit and the tensile frame body unit and is used for supporting the backrest. The chair has the beneficial effects that the sliding bottom frame unit at least has a limiting effect at the positions of the tensile rod unit and the tensile frame body unit, so that an adjustable, continuous and effective supporting effect can be provided for the backrest.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of furniture, and particularly relates to a sofa structure with a foldable backrest. BACKGROUND

[0002] A common sofa has a frame structure mainly comprising an armrest plate, a seat plate and a backrest plate, and a matching structure mainly comprising a soft cushion and a footstool.

[0003] Generally, in order to improve the use comfort of the sofa, the inclination angle of the backrest plate can be adjusted. When the backrest plate can be adjusted to a horizontal and folded state, the sofa can be used as a bed, and the practicability is further improved.

[0004] For example, a sofa with an adjustable backrest disclosed in a Chinese utility model patent with the patent number CN221830322U and the patent announcement date of October 15, 2024 mainly comprises a base, a connecting shaft, a backrest, an arc-shaped frame, a clamping groove, a horizontal rod, a seat cushion, a connecting piece, a guide groove and a sliding groove.

[0005] The sofa with an adjustable backrest in the utility model patent has the advantage that the bed body can be adjusted to a larger angle, and can better flexibly adapt to different use requirements according to needs.

[0006] However, the sofa with an adjustable backrest has at least the following problem of insufficient support strength of the adjusting structure in actual use, and the main reason is that the arc-shaped frame and the horizontal rod structure are not only relatively small in size, but also are arranged at the side, so that it is difficult to stably support the backrest for a long time, and the arc-shaped frame and the horizontal rod are relatively easy to break. UTILITY MODEL CONTENT

[0007] The application provides a sofa structure with a foldable backrest, and the technical problem to be solved is how to make the sofa have sufficient support strength at the rotatable and adjustable backrest position.

[0008] The technical solution adopted by the application to solve the above problem is a sofa structure with a foldable backrest, which comprises an armrest plate, a seat plate and a backrest, further comprises a mounting channel arranged on the backrest, a fixing shaft arranged on the armrest plate and inserted into the mounting channel, a tensile rod unit arranged on the armrest plate, a tensile frame unit arranged on the lower surface of the seat plate, and a sliding chassis unit arranged on the tensile rod unit and the tensile frame unit and used for supporting the backrest.

[0009] Further preferably, the anti-pulling rod unit comprises a protruding block arranged on the side surface of the armrest plate, an upper transverse screw rod arranged on the protruding block and inserted into the sliding chassis unit, and a limiting nut arranged on the upper transverse screw rod and used for clamping the sliding chassis unit.

[0010] Further preferably, the anti-pulling frame unit comprises a hole plate arranged on the lower surface of the seat plate, a lower transverse screw rod arranged on the hole plate and connected to the sliding chassis unit, and an adjustable nut arranged on the lower transverse screw rod and used for transversely limiting the sliding chassis unit by clamping the hole plate.

[0011] Further preferably, the sliding chassis unit comprises a sliding adjustable vertical plate arranged on the lower transverse screw rod and used for supporting the backrest, and a limiting hole arranged on the sliding adjustable vertical plate and inserted into the upper transverse screw rod.

[0012] Further preferably, the sliding chassis unit further comprises an anti-toppling bottom plate arranged on the sliding adjustable vertical plate and located on both sides of the sliding adjustable vertical plate respectively.

[0013] Further preferably, the anti-pulling frame unit further comprises an end limiting block arranged on the lower transverse screw rod and used for clamping the sliding adjustable vertical plate, and the sliding chassis unit further comprises a limiting hole arranged on the sliding adjustable vertical plate and used for passing through the lower transverse screw rod.

[0014] Further preferably, the sliding chassis unit further comprises a storage roller arranged on the sliding adjustable vertical plate and used for supporting on the ground when the sliding adjustable vertical plate is disengaged from the upper transverse screw rod and the lower transverse screw rod.

[0015] Further preferably, the side surface of the backrest further comprises a folding slot used for passing through the anti-pulling rod unit.

[0016] Further preferably, the number of the anti-pulling rod units is two, and the two anti-pulling rod units are arranged on the opposite side surfaces of the two armrest plates respectively.

[0017] Further preferably, the sliding chassis unit further comprises a chamfered edge piece arranged on the sliding adjustable vertical plate and used for supporting the backrest.

[0018] The beneficial effects of the present application include at least the following three points.

[0019] First, the sliding base unit has a limiting effect at the anti-pulling rod unit and the anti-pulling frame unit, so it can provide adjustable and continuous effective support for the backrest.

[0020] Second, the sliding base unit can be separated from the anti-pulling rod unit and the anti-pulling frame unit, ensuring that the horizontal use function of the backrest after being laid down can be effectively performed.

[0021] Third, after the sliding base unit is separated from the anti-pulling rod unit and the anti-pulling frame unit, it can be used as a storage sliding frame, further improving the practicality and convenience of the sofa. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present application.

[0023] Figure 2 It is a schematic diagram of the side external structure of the present application.

[0024] Figure 3 It is a schematic diagram of the position shape of the laid-down slot in the present application from the top view angle.

[0025] Figure 4 It is a schematic diagram of the use mode of the backrest laid down to the horizontal and the sliding base unit used as a storage sliding frame in the present application.

[0026] Figure 5 It is a schematic diagram of the first structure of the sliding base unit in the present application.

[0027] Figure 6 It is a schematic diagram of the second structure of the sliding base unit in the present application.

[0028] Figure 7 It is a schematic diagram of the position of the storage roller in the present application.

[0029] Figure 8 It is a schematic diagram of the position shape of the hole plate in the present application from the front view angle.

[0030] In the figure, the meanings of each mark are as follows.

[0031] Handrail plate 11, seat plate 12, backrest 13, cushion 14, ottoman 15;

[0032] Mounting hole 1, fixed shaft 2, anti-pulling rod unit 3, anti-pulling frame unit 4, sliding base unit 5, laid-down slot 6;

[0033] Protruding block 301, upper horizontal screw 302, limiting nut 303;

[0034] Hole plate 401, lower horizontal screw 402, adjustable nut 403, end limiting block 404;

[0035] Sliding adjustable vertical plate 501, limiting hole 502, anti-tipping base plate 503, limiting opening 504, storage rollers 505, chamfered edge piece 506. Detailed Implementation

[0036] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0037] like Figures 1-8 As shown, a sofa structure with a reclining backrest includes an armrest board 11, a seat board 12, and a backrest 13. It also includes mounting holes 1 on the backrest 13, a fixing shaft 2 on the armrest board 11 and inserted into the mounting holes 1, a tensile rod unit 3 on the armrest board 11, a tensile frame unit 4 on the lower surface of the seat board 12, and a sliding base frame unit 5 on the tensile rod unit 3 and the tensile frame unit 4 for supporting the backrest 13.

[0038] In this embodiment, two armrests 11, one seat 12, and one backrest 13 together form the overall frame of the sofa structure. The armrests 11 and the seat 12 are screwed or nailed together, and the two ends of the fixing shaft 2 are respectively connected to the two armrests 11, with the fixed installation height higher than the seat 12.

[0039] Furthermore, the backrest 13 can be used in either a tilted or horizontal reclined state; the former corresponds to a normal sofa state, while the latter can be considered a bed state. The effective tilt angle range of the backrest 13 is determined by the effective sliding distance of the sliding base unit 5. Generally, the tilted upper surface of the backrest 13 faces one side, which is the front of the sofa.

[0040] The sliding base unit 5 slides forward until it abuts against the seat plate 12 and / or the anti-tension rod unit 3, which corresponds to the minimum tilt angle of the backrest 13, meaning it is at its most vertical position. The moving base unit 5 slides backward until it is about to separate from the anti-tension rod unit 3 and / or the anti-tension frame unit 4 and / or the tilted lower surface of the backrest 13, which corresponds to the maximum tilt angle of the backrest 13, meaning it is at its most "flat" position.

[0041] For example, the obtuse angle between the backrest 13 and the seat 12 is 100-150°, which fully meets the normal use requirements of a sofa. Generally, the backrest 13 pressing against the forward-facing side of the moving base unit 5 is not safe enough and is not considered a normal way to use the backrest 13.

[0042] When the moving base unit 5 is separated from the tensile rod unit 3 and the tensile frame unit 4, the backrest 13 presses against the upper surface of the seat board 12, which is considered a horizontal reclining state. See the attached document for details.Figure 4 At this time, the sofa is in the state of a bed, the soft cushion 14 is placed on the seat plate 12 for use, and the height difference between the seat plate 12 and the backrest 13 can be filled, and the foot stool 15 is used together to ensure that the bed state also has sufficient use comfort.

[0043] On the other hand, the reason why the backrest 13 can obtain high-strength and long-lasting support during the entire tilting process is that:

[0044] First, the upper edge of the sliding chassis unit 5 always supports the tilted lower surface of the backrest 13, and is a relatively full linear support, not just a point support on both sides, so the support is comprehensive and stable, and the backrest 13 is not easily accidentally rotated and tilted backward;

[0045] Second, the sliding chassis unit 5 and the tension rod unit 3 and the tension frame unit 4 are fixed by a blocking and limiting method, which is a hard connection compared to a frictional fixation, an elastic clamping, and the like, so that the support of the sliding chassis unit 5 on the backrest 13 is long-term effective.

[0046] Finally, the main materials of the armrest plate 11, the seat plate 12, the backrest 13, the tension rod unit 3, the tension frame unit 4, and the sliding chassis unit 5 are wood or engineering plastic, and the fixed shaft 2 is a metal rod.

[0047] The tension rod unit 3 includes a protruding block 301 arranged on the side surface of the armrest plate 11, an upper horizontal screw rod 302 arranged on the protruding block 301 and inserted into the sliding chassis unit 5, and a limiting nut 303 arranged on the upper horizontal screw rod 302 and used for clamping the sliding chassis unit 5.

[0048] In the embodiment, the upper horizontal screw rod 302 is arranged on the rear side surface of the protruding block 301, and the armrest plate 11, the protruding block 301, and the upper horizontal screw rod 302 can be integrally formed. Two limiting nuts 303 are stacked on a single upper horizontal screw rod 302, so that the limiting nut 303 has a more stable effect of limiting the rearward sliding of the sliding chassis unit 5.

[0049] At this time, the maximum forward sliding range of the sliding chassis unit 5 is that the sliding chassis unit 5 abuts against the protruding block 301 and / or the seat plate 12.

[0050] The anti-pulling frame unit 4 includes a hole plate 401 arranged on the lower surface of the seat plate 12, a lower transverse screw rod 402 arranged on the hole plate 401 and connected to the sliding chassis unit 5, and an adjustable nut 403 arranged on the lower transverse screw rod 402 and used for laterally limiting the sliding chassis unit 5 by clamping the hole plate 401.

[0051] In the sofa width direction of the embodiment, the limiting effect of the anti-pulling rod unit 3 on the sliding chassis unit 5 is located at the side, and the limiting effect of the anti-pulling frame unit 4 is located in the middle, so that the limiting effect on the sliding chassis unit 5 is more comprehensive. For details, please refer to the accompanying drawings. Figure 8 .

[0052] Among them, the number of hole plates 401 is at least one, but only the adjustable nut 403 is arranged on the frontmost hole plate 401 to pull the lower transverse screw rod 402 with a backward sliding tendency. The remaining hole plates 401 are only used for positioning the lower transverse screw rod 402 in installation.

[0053] On the other hand, the first optional installation mode between the lower transverse screw rod 402 and the sliding chassis unit 5 is integrated or welded, that is, it cannot be separated. The use method of the adjustable nut 403 is consistent with the limiting nut 303, that is, the more stable mode of preferentially using two nuts can be used, and the front and rear fixing effect of the sliding chassis unit 5 is first released, and after the sliding chassis unit 5 is adjusted to the required position, the two nuts are tightened and fixed.

[0054] The sliding chassis unit 5 includes a sliding adjustable vertical plate 501 arranged on the lower transverse screw rod 402 and used for supporting the backrest 13, and a limiting hole 502 arranged on the sliding adjustable vertical plate 501 and inserted into the upper transverse screw rod 302.

[0055] In the embodiment, the shape of the sliding adjustable vertical plate 501 is rectangular, and the shape of the limiting hole 502 is circular. When the backrest 13 is used in an inclined manner, the sliding adjustable vertical plate 501 has downward and rearward components on the sliding adjustable vertical plate 501. The sliding adjustable vertical plate 501 is always pressed on the ground, so the downward component does not need to be borne by the anti-pulling rod unit 3 and the anti-pulling frame unit 4, and the two only need to overcome the rearward component.

[0056] The sliding chassis unit 5 further includes an anti-toppling bottom plate 503 arranged on the sliding adjustable vertical plate 501 and located at positions on both sides of the sliding adjustable vertical plate 501 with the seat plate 12.

[0057] In this embodiment, the main role of the anti-toppling bottom plate 503 is: when the limiting nut 303 and the adjustable nut 403 both unexpectedly fail, the L-shaped frame structure composed of the anti-toppling bottom plate 503 and the sliding adjustable vertical plate 501 still has a certain supporting effect on the backrest 13, so that the entire sliding chassis unit 5 has a certain anti-toppling effect.

[0058] Among them, the anti-toppling bottom plate 503 extends rearward on the sliding adjustable vertical plate 501.

[0059] The anti-tension frame unit 4 also includes an end head limiting block 404 arranged on the lower horizontal screw rod 402 and used for clamping the sliding adjustable vertical plate 501; and the sliding chassis unit 5 also includes a limiting hole 504 arranged on the sliding adjustable vertical plate 501 and used for passing through the lower horizontal screw rod 402.

[0060] In this embodiment, the second connection mode of the lower horizontal screw rod 402 and the sliding adjustable vertical plate 501 is that the lower horizontal screw rod 402 is inserted into the limiting hole 504, and the size of the end head limiting block 404 is greater than that of the limiting hole 504, so as to resist the rear side of the sliding adjustable vertical plate 501.

[0061] The advantages of this structure are:

[0062] First, when the backrest 13 is horizontally laid down and the sliding chassis unit 5 is not needed to be used, the latter can be separated from the lower horizontal screw rod 402, so that the storage operation is more simple and convenient, and the packaging size of the sofa is reduced;

[0063] Second, the L-shaped structure composed of the sliding adjustable vertical plate 501 and the anti-toppling bottom plate 503 is allowed to be laid horizontally, and at this time, the sliding adjustable vertical plate 501 is horizontal, and the upper surface thereof has a storage function.

[0064] On the other hand, whether the limiting hole 502 and the upper horizontal screw rod 302 are in contact or not, and whether the limiting hole 504 and the lower horizontal screw rod 402 are in contact or not, the upper horizontal screw rod 302 and the lower horizontal screw rod 402 can limit the rearward movement of the sliding adjustable vertical plate 501 with a small bending degree through their own rigidity, which can assist and supplement the limiting effect of the limiting nut 303 and the adjustable nut 403.

[0065] If the size of the limiting hole 502 and the limiting hole 504 is much greater than the diameter of the upper horizontal screw rod 302 and the lower horizontal screw rod 402, the anti-tension rod unit 3 and the anti-tension frame unit 4 still have the anti-tension effect on the rearward movement of the sliding adjustable vertical plate 501.

[0066] The sliding base unit 5 further comprises a storage roller 505 arranged on the sliding adjustable vertical plate 501 and used to support on the ground when the sliding adjustable vertical plate 501 is disengaged from the upper horizontal screw rod 302 and the lower horizontal screw rod 402.

[0067] In the embodiment, when the sliding base unit 5 is idle, the sofa is in the state of a bed, and the backrest 13 is in the horizontal laid-down state. At this time, the overall L-shaped structure of the sliding adjustable vertical plate 501 and the anti-toppling bottom plate 503 can be used as a storage drawer, and the storage roller 505 can make the taking and placing of the articles in the storage drawer more convenient and labor-saving.

[0068] It should be noted that:

[0069] Firstly, the above-mentioned storage drawer can be used between the two armrest plates 11 below the seat plate 12, the storage roller 505 rolls on the ground, and the size of the sliding base unit 5 in the width direction of the sofa is smaller than the inner side distance between the two armrest plates 11.

[0070] Secondly, when the sliding adjustable vertical plate 501 is used vertically, the vertical height of the storage roller 505 is located between the seat plate 12 and the backrest 13 below the lower horizontal screw rod 402, so as not to affect the most critical backrest supporting function of the sliding base unit 5. For details, please refer to the accompanying drawings. Figure 7 .

[0071] The side surface of the backrest 13 is further provided with a laid-down slot 6 for passing through the anti-pulling rod unit 3.

[0072] In the embodiment, the laid-down slot 6 is arranged only on the side surface of the backrest 13, or can be arranged on both the side surface and the upper end surface of the backrest 13, so as to ensure that the backrest 13 does not squeeze and bump the anti-pulling rod unit 3 during rotation to the horizontal position.

[0073] The number of the anti-pulling rod unit 3 is two, which are arranged on the opposite side surfaces of the two armrest plates 11.

[0074] In the embodiment, the sliding adjustable vertical plate 501 is provided with two relatively upper and edge limiting holes 502, which correspond to the two anti-pulling rod units 3, and is further provided with one relatively lower and central limiting hole 502, which corresponds to the one anti-pulling frame unit 4.

[0075] The sliding base unit 5 further comprises a chamfered edge piece 506 arranged on the sliding adjustable vertical plate 501 and used to support the backrest 13.

[0076] In the embodiment, the edge of the sliding adjustable vertical plate 501 directly abutting against the inclined upper surface of the backrest 13 is chamfered, and the chamfered edge is provided with the chamfered edge cover 506 which is installed by means of bonding, clamping, nailing or the like, so that the wear speed of the backrest 13 and / or the sliding adjustable vertical plate 501 is reduced, or the extrusion noise between the backrest 13 and the sliding adjustable vertical plate 501 is reduced.

[0077] The chamfered edge cover 506 is in a flattened state and has a rectangular shape, and the material thereof can be various common rubbers. When the backrest 13 is inclined, it does not have the function of limiting the rotation in the forward direction, but this does not affect the normal use of the sofa, and the back of the user is always pressed downward by the force in the backward direction.

[0078] Finally, the "put" in the above description can refer to the rotation of the backrest 13, the inclination adjustment function, or the function of completely lowering the backrest 13 to the horizontal state. The sofa has both functions.

[0079] The above description of the embodiments of the present application is combined with the drawings, but the present application is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the purpose of the present application. These are not creative modifications, and are protected by the patent law within the scope of the claims of the present application.

Claims

1. A sofa structure with a foldable backrest, comprising an armrest plate (11), a seat plate (12) and a backrest (13), characterized in that: The application also comprises a mounting hole (1) arranged on the backrest (13), a fixing shaft (2) arranged on the armrest plate (11) and inserted into the mounting hole (1), a tensile rod unit (3) arranged on the armrest plate (11), a tensile frame unit (4) arranged on the lower surface of the seat plate (12), and a sliding chassis unit (5) arranged on the tensile rod unit (3) and the tensile frame unit (4) and used for supporting the backrest (13).

2. A sofa structure with a backrest that can be folded down according to claim 1, characterized in that: The tensile rod unit (3) comprises a protruding block (301) arranged on the side of the armrest plate (11), an upper horizontal screw rod (302) arranged on the protruding block (301) and inserted into the sliding chassis unit (5), and a limiting nut (303) arranged on the upper horizontal screw rod (302) and used for clamping the sliding chassis unit (5).

3. A sofa structure with a backrest that can be folded down according to claim 2, characterized in that: The tensile frame unit (4) comprises a hole plate (401) arranged on the lower surface of the seat plate (12), a lower horizontal screw rod (402) arranged on the hole plate (401) and connected to the sliding chassis unit (5), and an adjustable nut (403) arranged on the lower horizontal screw rod (402) and used for limiting the sliding chassis unit (5) in the horizontal direction by clamping the hole plate (401).

4. A sofa structure with a backrest that can be folded down according to claim 3, characterized in that: The sliding chassis unit (5) comprises a sliding adjustable vertical plate (501) arranged on the lower horizontal screw rod (402) and used for supporting the backrest (13), and a limiting hole (502) arranged on the sliding adjustable vertical plate (501) and inserted into the upper horizontal screw rod (302).

5. A sofa structure with a backrest that can be folded down according to claim 4, characterized in that: The sliding chassis unit (5) further comprises an anti-toppling bottom plate (503) arranged on the sliding adjustable vertical plate (501) and located at both sides of the sliding adjustable vertical plate (501) and the seat plate (12).

6. A sofa structure with a backrest that can be folded down according to claim 4, characterized in that: The tensile frame unit (4) further comprises an end limiting block (404) arranged on the lower horizontal screw rod (402) and used for clamping the sliding adjustable vertical plate (501); and the sliding chassis unit (5) further comprises a limiting opening (504) arranged on the sliding adjustable vertical plate (501) and used for passing through the lower horizontal screw rod (402).

7. A sofa structure with a backrest that can be folded down according to claim 6, characterized in that: The sliding chassis unit (5) further comprises a storage roller (505) arranged on the sliding adjustable vertical plate (501) and used for supporting the ground when the sliding adjustable vertical plate (501) is disengaged from the upper horizontal screw rod (302) and the lower horizontal screw rod (402).

8. The sofa structure with a foldable backrest according to claim 1, characterized in that: The side of the backrest (13) is further provided with a folding slot (6) used for passing through the tensile rod unit (3).

9. The sofa structure with a foldable backrest according to claim 1, characterized in that: The number of the tensile rod units (3) is two, and each is arranged on the opposite side of the armrest plate (11).

10. The sofa structure with a foldable backrest according to claim 4, characterized in that: The sliding chassis unit (5) further comprises a chamfered edge piece (506) arranged on the sliding adjustable vertical plate (501) and used for supporting the backrest (13).

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