Sofa bed rack

Abstract

The invention relates to the technical field of furniture, in particular to a sofa bed rack which comprises a base frame. The seat frame can move back and forth relative to the base frame; one end of the leg bracket is hinged with the front end of the seat frame; the first driving mechanism is connected with the seat frame and the leg bracket and used for driving the leg bracket to be unfolded or folded; when the leg bracket is retracted, the end, far away from the leg bracket, hinged to the seat frame is propped against the ground, so that the front end of the seat frame is lifted and is separated from the ground. The leg bracket is driven to be unfolded or folded through the first driving mechanism, so that the leg bracket can support the legs of a user according to the requirements of the user, and the practicability of the sofa bed is improved to meet the diversified requirements of the user; and when the leg bracket is retracted, the front end of the seat frame can be lifted to prevent the seat frame from sliding, so that the seat frame can be prevented from moving through a simple structural design, and a complicated locking mechanism does not need to be added.

Description

Technical Field

[0001] The invention relates to the technical field of furniture, in particular to a sofa bed frame. Background Art

[0002] With the miniaturization of modern living spaces and the growing demand for multifunctional furniture, sofa beds have become an important category in the home furnishing market due to their space efficiency. Traditional manual sofa beds rely on mechanical hinges and manual operation to achieve sitting and lying position conversion, which has problems such as bulky structure, limited adjustment angle, and laborious operation. In recent years, the introduction of electric drive technology has significantly improved the user experience, achieving one-touch position switching through motors, linear actuators or hydraulic systems, reducing physical exertion and increasing adjustability.

[0003] In the existing sofa bed, the seat frame is movable, so the seat frame may move when people use it in the sofa state and bed state, thus affecting normal use. In order to avoid this situation, a relatively complex locking structure is usually designed. For example, in the Chinese utility model patent with publication number CN210748269U, the sofa bed disclosed therein is provided with a lifting assembly around the bottom surface of the seat board for lifting the sofa bed; but this structure is relatively complex. Summary of the invention

[0004] The purpose of the present invention is to provide a sofa bed frame, aiming to solve the technical problem of the complicated structure of preventing the seat frame from moving in the prior art.

[0005] To achieve the above object, the present invention provides a sofa bed frame, comprising:

[0006] Scaffolding;

[0007] A seat frame, which can move forward and backward relative to the base frame;

[0008] a leg support, one end of which is hinged to the front end of the seat frame;

[0009] A first driving mechanism, which connects the seat frame and the leg support and is used to drive the leg support to be extended or retracted;

[0010] When the leg support is retracted, the end of the leg support away from the seat frame hinged against the ground to lift the front end of the seat frame and leave it from the ground.

[0011] Preferably, a support member is installed at one end of the leg bracket away from the end hinged to the seat frame, and when the leg bracket is retracted, the support member is against the ground.

[0012] Preferably, the support member includes a connecting portion and a supporting portion arranged at the lower end of the connecting portion, the connecting portion is connected to the leg bracket, and the supporting portion is in a semi-spherical shape.

[0013] Preferably, the sofa bed frame also includes a backrest frame and a second driving mechanism, the backrest frame is hinged to the base frame and the seat frame respectively, and the second driving mechanism connects the base frame and the backrest frame to drive the backrest frame to unfold or retract; when the second driving mechanism drives the backrest frame to unfold, the backrest frame pushes the seat frame to move forward relative to the base frame.

[0014] Preferably, the backrest frame includes a front frame and a rear frame, both ends of the front frame are respectively hinged to the seat frame and the rear frame, the other end of the rear frame is hinged to the base frame, and the second driving mechanism is installed on the base frame, and the output end is connected to the rear frame.

[0015] Preferably, the front frame is detachably connected to the seat frame and the rear frame, the rear frame is detachably connected to the base frame, and the leg support is detachably connected to the seat frame.

[0016] Preferably, outwardly extending mounting plates are installed on the left and right sides of the base frame, a plate is installed on the mounting plate, triangular plates are installed on the left and right sides of the rear frame, and gaps for accommodating the triangular plates are formed between the plate and the left and right sides of the base frame; when the backrest frame is in the retracted state, the triangular plates are located on both sides of the cavity formed between the front frame and the rear frame; when the backrest frame is in the unfolded state, the triangular plates are located in the gaps formed by the plate and the left and right sides of the base frame.

[0017] Preferably, the base frame includes a left side frame, a right side frame, a first connecting rod and a mounting rod, the left side frame and the right side frame are opposite to each other and arranged at an interval, the two ends of the first connecting rod are respectively connected to the rear end of the left side frame and the rear end of the right side frame, the two ends of the mounting rod are respectively connected to the left side frame and the right side frame, and the mounting rod is located in front of the first connecting rod, and the second driving mechanism is installed on the mounting rod.

[0018] Preferably, the front end of the base frame is open and the interior is hollow, and the seat frame is located in the hollow part inside the base frame when it moves backward; a sliding guide plate is provided on the inner side of the base frame, and a guide wheel is provided on the outer side of the seat frame, and when the seat frame moves forward and backward relative to the base frame, the guide wheel rolls along the sliding guide plate.

[0019] Preferably, the seat frame includes a left frame, a right frame, a seat frame and a second connecting rod, the left frame and the right frame are opposite and spaced apart, the two ends of the second connecting rod are respectively connected to the left frame and the right frame, and the seat frame is installed on the upper ends of the left frame and the right frame.

[0020] Preferably, the first driving mechanism is mounted on the second connecting rod, and an output end thereof is connected to the leg bracket.

[0021] The sofa bed frame of the present invention has at least the following beneficial effects: the leg support is driven to be expanded or retracted by the first driving mechanism, so that the leg support can support the user's legs according to the user's needs, thereby improving the practicality of the sofa bed to meet the diverse needs of the users; and the leg support can lift the front end of the seat frame when retracted to prevent the seat frame from sliding, and the seat frame can be prevented from moving through a simple structural design without adding a complex locking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a structural schematic diagram of a sofa bed in a state after the panels and the triangular plate are removed from the sofa bed frame of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the sofa bed in the present invention after the panels and the triangular plate are removed from the frame of the sofa bed;

[0025] Figure 3 It is a structural schematic diagram of the sofa state of the sofa bed frame of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the sofa bed frame in bed state of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the support member of the present invention;

[0028] Figure 6 is a schematic diagram of a base frame of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the seat frame of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the first driving mechanism of the present invention.

[0031] In the accompanying drawings: In the accompanying drawings: 1-base frame, 11-left side frame, 12-right side frame, 13-first connecting rod, 14-mounting rod, 15-sliding guide plate, 2-seat frame, 21-left frame, 22-right frame, 23-seat frame, 24-second connecting rod, 3-leg bracket, 4-first driving mechanism, 41-driving motor, 42-screw, 43-movable housing, 5-support member, 51-connecting part, 52-support part, 6-back frame, 61-front frame, 62-rear frame, 7-second driving mechanism, 8-mounting plate, 9-plate, 10-triangle plate, 110-guide wheel, 120-sliding wheel.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] See also Figure 1 to Figure 2A sofa bed frame includes a base frame 1, a seat frame 2, a leg bracket 3 and a first driving mechanism 4. The base frame 1 is the basic frame of the sofa bed frame, which is placed on the ground during normal use, and the base frame 1 is generally fixed when the sofa bed switches between the sofa state and the bed state. The seat frame 2 can move forward and backward relative to the base frame 1. When the seat frame 2 moves backward, the seat frame 2 and the base frame 1 are combined to form a sofa state; when the seat frame 2 moves forward, the seat frame 2 is unfolded relative to the base frame 1 to form a bed state. One end of the leg bracket 3 is hinged to the front end of the seat frame 2, and it can be unfolded or retracted relative to the seat frame 2. The first driving mechanism 4 connects the seat frame 2 and the leg bracket 3, and the leg bracket 3 can be unfolded or retracted relative to the seat frame 2 under the action of the first driving mechanism 4. Specifically, the first driving mechanism 4 can be installed on the seat frame 2, and the output end is connected to the leg bracket 3; or the first driving mechanism 4 is installed on the leg bracket 3, and the output end is connected to the seat frame 2. Regardless of the sofa state or bed state, when the first driving mechanism 4 drives the leg support 3 to be fully extended, the leg support 3 is in a horizontal state, and the horizontal height is flush or almost flush with the upper end surface of the seat frame 2, so that the leg support 3 supports the user's legs; when the leg support 3 is fully retracted, the leg support 3 is in a state vertical to the ground; in addition, the leg support 3 can also be in a semi-extended state between fully extended and fully retracted, and the degree of extension can be controlled by the first driving mechanism 4, so that the leg support 3 can meet the user's various leg-dragging needs. When the leg support 3 is fully retracted, the leg support 3 is away from the end hinged with the seat frame 2 and against the ground, and the front end of the seat frame 2 is lifted to a certain height, so that the lowest end of the seat frame 2 is off the ground. When the sofa bed is adjusted between the sofa state and the bed state, the seat frame 2 is movable; and after the adjustment, the seat frame 2 is also easy to move, which affects the use. Therefore, after the adjustment, the leg support 3 is completely retracted by controlling the first driving mechanism 4, so that one end of the leg support 3 is against the ground and the front end of the seat frame 2 is lifted and off the ground, thereby limiting the movement of the seat frame 2 and ensuring that it can be used stably in both the sofa state and the bed state.

[0037] In this technical solution, the first driving mechanism 4 drives the leg support 3 to expand or retract, so that the leg support 3 can support the user's legs according to the user's needs; when the leg support 3 is retracted, it can lift the front end of the seat frame 2 to prevent the seat frame 2 from sliding; and when the seat frame 2 needs to slide, the leg support 3 can be controlled to expand. Whether in the sofa state or the bed state, the first driving mechanism 4 can control the leg support 3 to expand according to the user's needs, so that the leg support 3 supports the legs and increases the length of the bed; and when the leg support 3 is retracted, the seat frame 2 can be prevented from moving. While meeting the diverse usage needs, the sofa bed frame can prevent the seat frame 2 from moving through a simple structural design without adding a complex locking mechanism.

[0038] See also Figure 1 to Figure 2One end of the leg bracket 3 is hinged to the seat frame 2, and the other end is provided with a support member 5; the support member 5 is used to contact the ground when the leg bracket 3 is retracted. The leg bracket 3 is generally a metal frame. If the leg bracket 3 directly contacts the ground when retracted, noise may be generated and the leg bracket 3 may be damaged. Therefore, in this embodiment, a support member 5 is provided on the leg bracket 3, and the support frame is used to contact the ground to avoid direct contact between the leg bracket 3 and the ground, which can avoid noise and protect the leg bracket 3. The support member 5 can reduce the vertical dimension of the leg bracket 3 in the retracted state while keeping the height of the seat frame 2 unchanged, thereby reducing costs. If the support member 5 is worn or damaged, only the support member 5 needs to be replaced, so the maintenance cost can also be reduced.

[0039] In other embodiments, two or more support members 5 are spaced apart at one end of the leg support 3, which can not only maintain the stability of the leg support 3 and prevent the leg support 3 and the seat frame 2 from shaking, but also disperse the force and prevent the support member 5 from being easily damaged.

[0040] See also Figure 5 In other embodiments, the support member 5 includes a connecting portion 51 and a supporting portion 52 arranged at the lower end of the connecting portion 51, wherein the connecting portion 51 is detachably connected to the leg bracket 3, and the supporting portion 52 is in a semi-spherical shape. The supporting portion 52 is used to contact the ground. The supporting portion 52 is set in a semi-spherical shape. Compared with a structure with a right-angle edge at the bottom such as a flat bottom or a cylinder, the supporting portion 52 can be smoother in the process of contacting or separating from the ground, and the unfolding and retracting process of the leg bracket 3 is smoother. In addition, the structure of the support member 5 is set in this way, and it can also be conveniently set on the leg bracket 3. If the support member 5 is set to be detachably connected relative to the leg bracket 3, it is more convenient to replace the support frame.

[0041] See also Figure 1 to Figure 2, the sofa bed frame also includes a backrest frame 6 and a second driving mechanism 7. The backrest frame 6 is hinged to the rear end of the base frame 1 and the rear end of the seat frame respectively, the second driving mechanism 7 connects the base frame 1 and the backrest frame 6, and the second driving mechanism 7 can drive the backrest frame 6 to expand or retract. Specifically, the second driving mechanism 7 is installed on the base frame 1, and the output end of the second driving mechanism is connected to the backrest frame 6. In other embodiments, the second driving mechanism 7 can be installed on the backrest frame 6, and the output end of the second driving mechanism 7 is connected to the base frame 1. When the second driving mechanism 7 drives the backrest frame 6 to retract, the sofa bed is in the sofa state, and the backrest frame 6 is used as the backrest support of the sofa bed; when the second driving mechanism 7 drives the backrest frame 6 to expand, the sofa bed is in the bed state, and the backrest frame 6 is expanded as a bed board support. When the second driving mechanism 7 drives the backrest frame 6 to expand, the backrest frame 6 will push the seat frame 2 to move forward relative to the base frame 1 during the expansion process; when the backrest frame 6 is fully expanded, the seat frame 2 is also pushed to the frontmost position, and the frame is fully expanded into the bed state. By providing the backrest frame 6 and the second driving mechanism 7, the sofa bed can provide backrest support in the sofa state and increase the length of the bed in the bed state. In addition, the switching between the sofa state and the bed state can be completed by controlling the second driving mechanism 7, and the movement of the seat frame 2 does not need to rely on manual labor, with a high degree of automation and a simple structure.

[0042] See also Figure 1 to Figure 2 The backrest frame 6 includes a front frame 61 and a rear frame 62. One end of the front frame 61 is hinged to the rear end of the seat frame 2, the other end of the front frame 61 is hinged to one end of the rear frame 62, and the other end of the rear frame 62 is hinged to the rear end of the base frame 1. Specifically, the second drive mechanism 7 is installed on the base frame 1, and the output end of the second drive mechanism 7 is connected to the rear frame 62. The structure of the backrest frame 6 is arranged in this way to better link the seat frame 2, and the overall structure is simpler.

[0043] The front frame 61 is detachably connected to the seat frame 2 and the rear frame 62, the rear frame 62 is detachably connected to the base frame 1, and the leg bracket 3 is detachably connected to the seat frame 2. The front frame 61, the rear frame 62, and the leg bracket 3 are detachably connected to the base frame 1 and the seat frame 2, which can greatly reduce the packaging volume and reduce the transportation cost.

[0044] See also Figure 3 to Figure 4, mounting plates 8 are installed on both sides of the base frame 1, and specifically, mounting plates 8 are installed in the middle position of the front end and the rear end of the left and right sides, so a total of four mounting plates 8 are installed on the base frame 1. The mounting plate 8 is an L-shaped structure, one end of which is connected to the outer side of the base frame 1 and the other end is connected to the plate 9. A gap is formed between the plate 9 and the outer side of the base frame 1, and the gap is used to accommodate the triangle plates 10 on the left and right sides of the rear frame 62 when the backrest frame 6 is in the unfolded state. When the backrest is in the retracted state, the upper end of the front frame 61 and the upper end of the rear frame 62 are tightly attached, and the lower end of the front frame 61 and the lower end of the rear frame 62 are spaced a certain distance apart, and the rear frame 62 is in a vertical state and the front frame 61 is in an inclined state, so a cavity similar to a triangular prism is formed between the front frame 61 and the rear frame 62; in this state, the triangle plates 10 on both sides of the rear frame 62 are located on both sides of the cavity to cover the cavity. When the backrest frame 6 is unfolded, the front frame 61 and the rear frame 62 will unfold to be laid flat on the upper end of the base frame 1. At this time, the triangle plates 10 on both sides of the rear frame 62 will move from top to bottom to both sides of the base frame 1. Since the plates 9 need to be arranged on both sides of the base frame 1, in order to avoid the triangle plates 10 and the plates 9 on both sides of the base frame 1 from interfering with each other, the mounting plates 8 extending outward are arranged on both sides of the base frame 1, and the plates 9 are mounted on the mounting plates 8, so that there is a gap between the plates 9 and both sides of the base frame 1 to accommodate the triangle plates 10. In this way, the sofa bed frame can avoid mutual interference between components while ensuring the structural integrity.

[0045] Also, see Figure 1 to Figure 2 A plate 9 is installed on both the front frame 61 and the rear frame 62. When the backrest frame 6 is in the unfolded state, the plate 9 on the front frame 61 and the rear frame 62 is located on the upper end surface of the front frame 61 and the rear frame 62.

[0046] See also Figure 6 The base frame 1 includes a left side frame 11, a right side frame 12, a first connecting rod 13 and a mounting rod 14. The left side frame 11 and the right side frame 12 have the same structure, and the two are arranged oppositely and at intervals. One end of the first connecting rod 13 is connected to the rear end of the left side frame 11, and the other end is connected to the rear end of the right side frame 12. One end of the mounting rod 14 is connected to the left side frame 11, and the other end is connected to the right side frame 12, and the mounting rod 14 is located in front of the first connecting rod 13. The second driving mechanism 7 is installed on the mounting rod 14, and its output end is connected to the rear frame 62 of the backrest frame 6. Such an arrangement makes the structure of the base frame 1 simple and concise, and convenient to manufacture. More preferably, the two ends of the first connecting rod 13 are detachably connected to the left side frame 11 and the right side frame 12, respectively, and the two ends of the mounting rod 14 are also detachably connected to the left side frame 11 and the right side frame 12, respectively; through the design of the detachable structure, mass production is convenient, and the packaging and transportation costs are low, and the assembly is also simple.

[0047] See also Figure 6 to Figure 7, the front end of the base frame 1 is open and the interior is hollow, and the seat frame 2 is located in the hollow part of the base frame 1 when it moves backward. The width of the base frame 1 is greater than the width of the seat frame 2, specifically, the width of the hollow area inside the base frame 1 is greater than the width of the outer side of the seat frame 2. In the sofa state, the seat frame 2 is located in the hollow part of the base frame 1. A sliding guide plate 15 is provided on the inner side of the base frame 1, specifically, corresponding sliding guide plates 15 are provided on both sides of the interior. The sliding guide plate 15 is a 7-shaped long strip, one side of which is fixed to the inner side of the base frame 1, and the other side extends to the hollow part of the inner side of the base frame 1; the length direction of the sliding guide plate 15 is the same as the direction in which the seat frame 2 moves forward and backward. A guide wheel 110 is provided on the outer side of the seat frame 2, specifically, a guide wheel 110 corresponding to the two sliding guide plates 15 is provided on both sides of the seat frame 2. When the seat frame 2 moves forward and backward relative to the base frame 1, the guide wheel 110 rolls against the sliding guide plate 15. Specifically, the portion where the sliding guide plate 15 extends to the hollow portion inside the base frame 1 is located directly above the guide wheel 110, and the upper end of the guide wheel 110 slides against the sliding guide plate 15. The structural arrangement of the base frame 1 and the seat frame 2 can prevent the seat frame 2 from being clamped or bumped into the user during movement; and the arrangement of the sliding guide plate 15 and the guide wheel 110 further improves the accuracy and smoothness of the seat frame 2 during movement, and can prevent the seat frame 2 from deviating during movement.

[0048] See also Figure 7 The seat frame 2 includes a left frame 21, a right frame 22, a seat frame 23 and a second connecting rod 24. The left frame 21 and the right frame 22 have the same structure, and the two are arranged oppositely and at intervals. One end of the second connecting rod 24 is detachably connected to the middle position of the lower end of the left frame 21, and the other end is detachably connected to the middle position of the lower end of the right frame 22. The first driving mechanism 4 is mounted on the second connecting rod 24, and the output end is connected to the leg bracket 3. The seat frame 23 is detachably mounted on the upper ends of the left frame 21 and the right frame 22. The width of the seat frame 23 is greater than the maximum width between the left frame 21 and the right frame 22, that is, the two sides of the seat frame 23 extend outward relative to the left frame 21 and the right frame 22 respectively; the extended part can be used as an armrest frame when the sofa bed is in the sofa state. The seat frame 2 has a simple structure and is easy to manufacture. The components are detachably connected, which is convenient for mass production, and the packaging volume is small and the transportation cost is low.

[0049] See also Figure 7 The lower end of the seat frame 2 is provided with a sliding wheel 120, and the sliding wheel 120 contacts the bottom surface so that the seat frame 2 can move smoothly on the ground. Specifically, sliding wheels 120 are installed at intervals in front and back at the lower ends of the left frame 21 and the right frame 22. When the leg support 3 is retracted, the front end of the seat frame 2 is lifted, and the sliding wheels 120 in front of the lower ends of the seat frame 23 and the right frame 22 are off the ground, thereby preventing the seat frame 2 from moving easily.

[0050] See also Figure 3 to Figure 4The left and right sides of the seat frame 2 are both equipped with panels 9, specifically, the outer sides of the left frame 21 and the right frame 22 are both equipped with panels 9. In addition, the leg bracket 3 is also equipped with panels 9, and the panels 9 on the leg bracket 3 are located on the upper end surface of the leg bracket 3 when the leg bracket 3 is unfolded.

[0051] In this embodiment, the first drive mechanism 4 and the second drive mechanism 7 have the same structure. Here, only the specific structure of the first drive mechanism 4 is described, and the structure of the second drive mechanism 7 is not repeated. Figure 8 The first driving mechanism 41 includes a driving motor 42, a screw rod 42 and a moving housing 43. The output end of the driving motor 42 is connected to one end of the screw rod 42 and is used to drive the screw rod 42 to rotate. The moving housing 43 is sleeved on the screw rod 42 and is threadedly connected to the screw rod 42. The driving motor 42 is installed on the second connecting rod 24 of the seat frame 2, and the end of the moving housing 43 away from the driving motor 42 is connected to the leg support. The driving motor 42 rotates, which can drive the screw rod 42 to rotate around its axis. When the screw rod 42 rotates, the moving housing 43 can be driven to move relative to the screw rod 42 along the vertical direction of the screw rod 42. The driving motor 42 can realize forward and reverse rotation through control, so the screw rod 42 can also rotate forward or reverse. The moving housing 43 can move in two directions under the rotation of the screw rod 42, thereby driving the leg support 3 to expand or retract. When the driving motor 42 drives the screw rod 42 to rotate, the moving housing 43 moves axially along the screw rod 42, pushing the leg support 3 to rotate around the hinge point of the seat frame 2. When unfolded, the leg bracket 3 is pushed to a horizontal state; when retracted, the leg bracket 3 is pulled to a vertical state.

[0052] In this embodiment, the hinges between the above-mentioned parts can be rotatably connected by using a pin or a rotating shaft as the core component of the hinge. For example, an axis hole is provided at the end of the leg bracket 3, and a fixed axis seat is provided at the corresponding position at the front end of the seat frame 2, and the two are rotatably connected by inserting a pin. This design allows the leg bracket 3 to rotate around the hinge axis in a vertical plane to achieve the actions of unfolding (supporting the legs in a horizontal state) and retracting (resting against the ground in a vertical state). The hinge between the front frame 61 and the rear frame 62, the hinge between the front frame 61 and the seat frame 2, and the hinge between the rear frame 62 and the base frame 1 can all adopt this method; and this type of hinge can also simultaneously achieve a detachable connection between the components.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sofa bed frame, characterized in that: include: Base frame (1); A seat frame (2) which can move forward and backward relative to the base frame (1); A leg support (3), one end of which is hinged to the front end of the seat frame (2); A first driving mechanism (4), which is connected to the seat frame (2) and the leg support (3) and is used to drive the leg support (3) to be unfolded or retracted; When the leg support (3) is retracted, the end of the leg support (3) away from the hinged end of the leg support (3) and the seat frame (2) is against the ground to lift the front end of the seat frame (2) off the ground.

2. A sofa bed frame according to claim 1, characterized in that: A support member (5) is installed at one end of the leg bracket (3) away from the end hinged to the seat frame (2); when the leg bracket (3) is retracted, the support member (5) is against the ground.

3. A sofa bed frame according to claim 2, characterized in that: The support member (5) comprises a connecting portion (51) and a supporting portion (52) arranged at the lower end of the connecting portion (51); the connecting portion (51) is connected to the leg bracket (3); and the supporting portion (52) is in a semi-spherical shape.

4. The sofa bed frame according to claim 1, characterized in that: The vehicle further comprises a backrest frame (6) and a second driving mechanism (7), wherein the backrest frame (6) is hinged to the base frame (1) and the seat frame (2) respectively, and the second driving mechanism (7) connects the base frame (1) and the backrest frame (6) to drive the backrest frame (6) to be unfolded or retracted; when the second driving mechanism (7) drives the backrest frame (6) to be unfolded, the backrest frame (6) pushes the seat frame (2) to move forward relative to the base frame (1).

5. A sofa bed frame according to claim 4, characterized in that: The backrest frame (6) comprises a front frame (61) and a rear frame (62); two ends of the front frame (61) are respectively hinged to the seat frame (2) and the rear frame (62); the other end of the rear frame (62) is hinged to the base frame (1); the second drive mechanism (7) is mounted on the base frame (1), and the output end is connected to the rear frame (62).

6. The sofa bed frame according to claim 5, characterized in that: The front frame (61) is detachably connected to the seat frame (2) and the rear frame (62); the rear frame (62) is detachably connected to the base frame (1); and the leg support (3) is detachably connected to the seat frame (2).

7. The sofa bed frame according to claim 5, characterized in that: The left and right sides of the base frame (1) are both provided with mounting plates (8) extending outward, and the mounting plates (8) are provided with plates (9), and the left and right sides of the rear frame (62) are both provided with triangular plates (10), and the plates (9) and the left and right sides of the base frame (1) form gaps for accommodating the triangular plates (10); when the backrest frame (6) is in a retracted state, the triangular plates (10) are located on both sides of a cavity formed between the front frame (61) and the rear frame (62); when the backrest frame (6) is in an unfolded state, the triangular plates (10) are located in the gaps formed by the plates (9) and the left and right sides of the base frame (1).

8. The sofa bed frame according to claim 4, characterized in that: The base frame (1) comprises a left side frame (11), a right side frame (12), a first connecting rod (13) and a mounting rod (14); the left side frame (11) and the right side frame (12) are arranged opposite to each other and spaced apart; two ends of the first connecting rod (13) are respectively connected to the rear end of the left side frame (11) and the rear end of the right side frame (12); two ends of the mounting rod (14) are respectively connected to the left side frame (11) and the right side frame (12); the mounting rod (14) is located in front of the first connecting rod (13); and the second driving mechanism (7) is mounted on the mounting rod (14).

9. The sofa bed frame according to claim 1, characterized in that: The front end of the base frame (1) is open and the interior is hollow; when the seat frame (2) moves backward, it is located in the hollow interior of the base frame (1); a sliding guide plate (15) is provided on the inner side of the base frame (1), and a guide wheel (110) is provided on the outer side of the seat frame (2); when the seat frame (2) moves forward and backward relative to the base frame (1), the guide wheel (110) rolls against the sliding guide plate (15).

10. The sofa bed frame according to claim 1, characterized in that: The seat frame (2) comprises a left frame (21), a right frame (22), a seat frame (23) and a second connecting rod (24); the left frame (21) and the right frame (22) are arranged opposite to each other and spaced apart; the two ends of the second connecting rod (24) are respectively connected to the left frame (21) and the right frame (22); the seat frame (23) is mounted on the upper ends of the left frame (21) and the right frame (22); the first driving mechanism (4) is mounted on the second connecting rod (24), and the output end is connected to the leg bracket (3).

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