CN115251641A - sofa bed - Google Patents

Abstract

The present invention provides a sofa bed. The sofa bed includes a plurality of main units, and each main unit includes: a unit frame, the inner upper edge of the unit frame is formed with a step portion; the unit mesh panel includes a frame formed around its outer edge, the The frame can be placed on the step portion of the unit frame. Wherein, a plurality of paddles are also mounted around the unit frame, the paddles are configured to be operable to move between a first position and a second position, in which the paddles are Shade on top of the frame to prevent the cell mesh from disengaging from the cell frame; in the second position, the pick is off the top of the frame to allow removal of the cell mesh from the cell Frame removed. According to the present invention, the sofa bed is convenient for disassembly, transportation and storage.

Description

sofa bed

technical field

The invention relates to the field of furniture, in particular to a sofa bed.

Background technique

With the gradual improvement of people's material life, residents' demand for furniture products is also in a trend of diversification. Among them, sofa bed has become a popular furniture product. There are some defects in the existing sofa bed, for example: the switch between the two states is not smooth enough in the existing sofa bed, and it is usually difficult for a less powerful operator to complete it alone; the existing sofa bed may be used as a sofa state. It is not stable enough, and the angle between the seat and the back may change, which affects the comfort level; and the folding method of the existing folding bed is also relatively simple, which cannot meet the various needs of users.

Take a step back and say, even if the above-mentioned problems can be solved, present sofa bed also still has many deficiencies in details. For example, the structural design used to drive the sofa bed to move slightly (which can be understood as floating) in the state of the sofa configuration is unreasonable; the base support structure of the sofa bed cannot support both the main frame of the sofa configuration and the bed configuration The main frame of the main frame; the installation method between the bed frame of the main frame and the wire mesh board is unreasonable; the disassembly and folding of various parts of the sofa bed cannot be realized; if there is a spring module, the installation method of the spring module is usually not reasonable enough.

Therefore, there is a need to provide a sofa bed that at least partially solves the above-mentioned problems.

Contents of the invention

The main purpose of the present invention is to provide a sofa bed, the switching between the two use states of the sofa bed is easy to realize and convenient to operate. And in the predetermined switching process and the predetermined use process, the angle between the seat part and the back part can be locked to improve the reliability of the operation; Sliding in the chute can also reduce the user's operating burden and realize switching operations quickly and labor-saving.

In order to realize the switching of the main frame between the sofa configuration and the bed configuration, a hinge in the form of three sections is provided at the junction of the backrest and the seat; a support tube is also provided on the bottom support structure of the sofa bed, which can be used in both Supporting the main frame when the sofa bed is used as a sofa and supporting the main frame when the sofa bed is used as a bed; the main frame can include a bed frame and a wire mesh panel, which can be skillfully joined and disassembled; the armrest frame can also be disassembled Folds for easy storage and transport.

Moreover, a plurality of detachable elastic modules can be arranged on the sofa bed, and the installation of the elastic modules is relatively simple and easy to operate, and the user can manually install them to obtain a sofa bed with better comfort.

In order to install the spring module, the main frame is set to be folded in half, and the slideway for installing the spring module is opened at the folded place to allow the spring module to enter the slideway. When the main frame is re-tiled, the opening is closed to prevent the spring module from falling off; the spring The modules can also be configured to be pressed directly onto the track from top to bottom, such that adjacent spring modules do not interfere with each other.

According to one aspect of the present invention, a kind of sofa bed is provided, and described sofa bed comprises a plurality of main body units, and each main body unit comprises:

A unit frame, the inner upper edge of the unit frame is formed with a stepped portion;

a unit net plate, the unit net plate comprising a frame formed around its outer edge, the frame can be placed on the step portion of the unit frame,

Wherein, a plurality of paddles are installed around the unit frame, and the paddles are configured to be operable to move between a first position and a second position. In the first position, the paddles Covering the top of the frame to prevent the cell mesh from disengaging from the cell frame; in the second position, the paddle is clear of the top of the frame to allow the cell mesh to be removed from the cell Frame removed.

In one embodiment, the paddle is connected to the unit frame via a pin perpendicular to the overall extension direction of the main body unit and can rotate around the pin.

In one embodiment, each of the main body units is a polygonal structure, and each corner of the polygonal structure is provided with the pick.

In one embodiment, the sofa bed body includes a seat portion and a back portion disposed adjacent to each other, and the seat portion and the back portion can be folded or laid flat around a hinge mechanism, so that the sofa bed body is positioned on the bed. The seat portion and the back portion respectively comprise at least one of the main body units.

In one embodiment, both the seat part and the back part are formed into a rectangular structure, one longitudinal edge of the seat part and the back part is butted together, and the seat part and the back part respectively It includes two said main body units arranged along its longitudinal direction.

In one embodiment, the sofa bed includes armrest frames, the armrest frames are respectively arranged on both sides of the sofa bed body along the longitudinal direction, and are connected with the sofa bed body through the hinge mechanism, wherein, Each of the armrest frames is respectively formed with a slideway, so that the movement of the hinge mechanism is guided by the slideway,

Wherein, the sofa bed is configured to lock the backrest at a predetermined angle relative to the seat when the backrest and the seat pivot relative to each other around the hinge mechanism, and in the locked state The hinge mechanism can drive the main body of the sofa bed to move under the guidance of the slideway.

In one embodiment, the hinge mechanism includes:

a seat portion connecting rod attached to and extending along a lateral side edge of the seat portion;

a backrest connecting rod attached to a lateral edge of the backrest on the same side as the lateral side edge of the seat portion and extending along the lateral side edge of the backrest;

A pivot connecting the seat portion connecting rod and the back portion connecting rod such that the back portion and the seat portion can pivot relative to each other.

In one embodiment, the sofa bed body is configured to be able to release the seat portion connecting rod and the back portion connecting rod when the seat portion is operated to pivot toward the back portion in the locked state. between locks.

In one embodiment, a ratchet is provided on one of the connecting rod of the seat part and the connecting rod of the back part, and a pawl is provided on the other of the connecting rod of the seat part and the connecting rod of the back part. , the ratchet and the pawl cooperate with each other so that the backrest is locked at a predetermined angle relative to the seat.

Description of drawings

For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals refer to the same parts in the figures. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and the components in the drawings are not drawn to scale.

Fig. 1 is the three-dimensional schematic diagram under the state that is used as bed of the main frame of sofa bed according to the preferred embodiment of the present invention;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is a three-dimensional schematic diagram of the main frame in Fig. 1 when it is used as a sofa;

Fig. 4 is the side view of Fig. 3;

Fig. 5 is an exploded schematic view of the connection between the seat portion and the back portion;

Fig. 6A-Fig. 6F is the side view of main body frame, and it has shown the process that this sofa reaches the second use state from the first use state, and returns to the first use state again;

Fig. 7 and Fig. 8 are schematic diagrams of assembly and disassembly of a hinge mechanism in an embodiment;

Figure 9 and Figure 10 are schematic diagrams of assembly and disassembly of a hinge mechanism in another embodiment;

Fig. 11 is a partial structural schematic diagram of the bottom support structure of the sofa bed, wherein the hinge mechanism has not yet been installed in place;

Fig. 12 is a partially enlarged schematic diagram of Fig. 11;

Fig. 13 is a partial structural schematic diagram of the bottom support structure of the sofa bed, wherein the hinge mechanism has been installed in place;

Fig. 14, Fig. 15 are the schematic diagrams after the bottom supporting structure in Fig. 13 is installed main frame;

Fig. 16 is a partial structural diagram of the bottom support structure of the sofa bed of an embodiment;

Figure 17 is a schematic diagram of the support tube in Figure 16;

Fig. 18 is a schematic diagram when the main body frame is installed on the bottom support structure in Fig. 16 and the sofa bed is in the first use state;

Fig. 19 is a schematic cross-sectional view taken along line A-A in Fig. 18;

Fig. 20 is a schematic diagram when the main frame is installed on the bottom support structure in Fig. 16 and the sofa bed is in the second use state;

Fig. 21 is a schematic cross-sectional view taken along line B-B in Fig. 20;

Figure 22 is a partially enlarged view of Figure 21;

Fig. 23 is a kind of structure as the prior art of contrasting with the present invention;

Fig. 24 is a schematic diagram of a sofa bed according to a preferred embodiment of the present invention;

Fig. 25 is a schematic view of the seat portion or the back portion of the sofa bed in Fig. 24;

Fig. 26 is a sectional view of a partial position in Fig. 25;

Fig. 27 is an exploded schematic view of the structure in Fig. 25;

Figure 28 is a partial enlarged view of the unit frame in Figure 27;

Figure 29 is a partially enlarged view in Figure 25;

Figure 30 is a schematic diagram of the armrest frame of the sofa bed according to a preferred embodiment of the present invention;

Fig. 31 is an exploded schematic view of the armrest frame in Fig. 30;

Fig. 32 is an exploded schematic diagram of the armrest frame body in Fig. 31;

Figure 33 is a schematic diagram of the connection of the section of the leg and the section of the connecting section in Figure 32;

Fig. 34 is a schematic diagram of folding and storing the armrest frame body in Fig. 31;

Fig. 35 is a schematic diagram of an alternative structure of the reinforcing beam in Fig. 31;

Fig. 36 is the schematic diagram of the bottom supporting structure of sofa bed according to a kind of preferred embodiment of the present invention;

Fig. 37 is a partially enlarged schematic diagram of Fig. 36;

38A and 38B are schematic diagrams of a sofa bed according to a preferred embodiment of the present invention, wherein a spring module is installed on the sofa bed;

Fig. 39 is an enlarged and exploded schematic view of a spring module in Fig. 38A and Fig. 38B;

Fig. 40 is a possible structure of the seat part or the back part in Fig. 38A and Fig. 38B;

Figure 41-Figure 46 is a schematic diagram of the process of installing the spring module corresponding to Figure 40;

Fig. 47 is another possible structure of the seat portion or the back portion in Fig. 38A, Fig. 38B;

Figure 48-Figure 49 is a schematic diagram of the process of installing the spring module corresponding to Figure 47, wherein some steps in the middle are omitted;

Fig. 50 is a schematic diagram of a sofa bed according to another preferred embodiment of the present invention, wherein a spring module is installed on the sofa bed;

Fig. 51, Fig. 52, Fig. 55, and Fig. 56 are a schematic cross-sectional view of Fig. 50, which sequentially show the process of installing spring modules on two adjacent slide rails respectively;

Figure 53 is a partially enlarged view of Figure 52;

Figure 54A is an enlarged view of the section of the longitudinal beam in Figure 53;

Figure 54B and Figure 54C are alternative solutions to the longitudinal beams in Figure 54A;

Figure 57-Figure 61 are respectively the process of installing the elastic module on a main body unit;

Fig. 62 and Fig. 63 are schematic diagrams after two main frames are arranged side by side, and Fig. 62 and Fig. 63 can constitute the back or seat part of the sofa bed.

Detailed ways

Referring now to the accompanying drawings, specific embodiments of the present invention will be described in detail. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to realize the present invention on the basis of the preferred embodiments, and the other ways also fall within the scope of the present invention.

The present invention provides a sofa bed, and Figures 1-63 show at least part of the structure according to some preferred embodiments of the present invention. First of all, it should be noted that the "transverse direction" and "longitudinal direction" mentioned in the present invention are two directions perpendicular to each other, which are relative to the rectangle formed by the seat part, the backrest part, or even the unit frame. direction, the transverse direction is shown for example by X in the drawings, and the longitudinal direction is shown by Y in the drawings for example. The height direction referred to herein is the absolute vertical direction, which is indicated by Z in the drawings.

Figures 1-63 illustrate some preferred embodiments according to the present invention.

Referring to Fig. 1-Fig. 4, the sofa bed of present preferred embodiment comprises main frame 100, and main frame 100 comprises seat part 4, back part 3, seat part connecting rod 41, back part connecting rod 31 and two armrest frames 2. Wherein, the seat portion 4 and the backrest portion 3 are all formed into a rectangular structure, which can be a rectangular frame structure, or a rectangular plate structure. An edge along the longitudinal direction of the seat part 4 and an edge along the longitudinal direction of the backrest part 3 are butted together.

The seat part connecting rod 41 is fixed on the edge of the lateral direction of the seat part 4, the back part connecting rod 31 is fixed on the edge of the lateral direction of the back part 3, and the seat part connecting rod 41 and the back part connecting rod 31 can be positioned relative to each other. They are pivotally connected to each other, and when the seat portion connecting rod 41 and the backrest portion connecting rod 31 pivot relative to each other, the angle between them increases or decreases. It should be noted that the "included angle" mentioned in the present invention refers to an included angle less than or equal to 180°.

Two armrest frames 2 are arranged at the two ends of the longitudinal direction of the seat portion 4 and the backrest portion 3, and each armrest frame 2 is provided with a slideway that opens toward the backrest portion 3 and the seat portion 4 and partially extends in the transverse direction , in this embodiment, the slideway is a slideway 211 , and the rear end 211b of the slideway 211 is lower than the front end 211a of the slideway 211 .

An exploded schematic view of the pivotal connection of the seat part 4 and the back part 3 is shown in FIG. 5 . Referring to FIG. 5 , the seat portion connecting rod 41 and the back portion connecting rod 31 are joined at the hinge mechanism 34 , and a pin 341 protrudes from the side of the hinge mechanism 34 facing the armrest. The front end 211 a of the sliding slot 211 is provided with an upward opening, so that the pin 341 can enter the sliding slot 211 from the front end 211 a of the sliding slot 211 and slide in the sliding slot 211 . At the hinge mechanism 34 places, special-shaped gears and gear matching claws are provided, and special-shaped gears and gear matching claws are respectively arranged on the seat portion connecting rod 41 and the backrest connecting rod 31. The special-shaped gear is, for example, a ratchet 342. The edge of the ratchet 342 is provided with a recessed portion along the radial direction of the ratchet 342. The gear mating pawl is provided with a protrusion that cooperates with the recess. The positions of the recess and the protrusion are set as Such that when the backrest part 3 and the seat part 4 form a predetermined obtuse angle, the protruding part fits into the recessed part to realize locking. Seat portion 4 is provided with seat portion inserting sleeve 42 for accommodating seat portion connecting rod 41, and backrest portion 3 is provided with backrest portion inserting sleeve 32 for accommodating back portion connecting rod 31.

Further, each armrest frame 2 includes an armrest frame body 22 and a reinforcing beam 21, the chute 211 is arranged on the reinforcing beam 21, and the extending direction of the reinforcing beam 21 is consistent with the extending direction of the chute 211, that is, the rear end of the reinforcing beam 21 211b is also lower than the front end 211a of the reinforcing beam 21 . The armrest frame body 22 includes two columns extending in the vertical direction and a body beam connected to the top of the two columns. The body beam is connected to the middle of the two columns and is parallel to the body beam.

Except armrest frame 2, the support fixed structure of sofa bed also comprises bottom support structure 24, and bottom support structure 24 is supported in the below of backrest 3, seat portion 4 and is fixedly connected with two armrest frames 2. The bottom support structure 24 includes, for example, bottom support structure longitudinal beams, bottom support structure transverse beams 23 and legs 25 . The sofa bed also includes a driven beam 26, and one end of the driven beam 26 is pivotally connected with the armrest frame 2, and the other end of the driven beam 26 is pivotally connected with the backrest 3.

Fig. 6A-Fig. 6F shows that the main body frame 100 reaches the second use state (used as a sofa during the second use state) from the first use state (used as a bed in the first use state) and then reaches the first use state. process.

Referring first to Fig. 6A, when the main body frame 100 is in the first use state, the backrest portion 3 and the seat portion 4 are both horizontal, and the angle between them is a flat angle. The included angle between the backrest connecting rod 31 and the seat connecting rod 41 is also approximately a flat angle, and the pivot at the hinge mechanism 34 is approximately located near the front end 211a of the slide groove 211. At this time, the backrest connecting rod 31 and the seat connecting rod 41 are not locked, allowing the seat 4 to be operated to pivot towards a position where the angle between the seat 4 and the backrest 3 is reduced. The direction of is shown by the arrow in Figure 6A.

When the main body frame 100 needs to be adjusted to the second use state, the seat part 4 can be pivoted along the direction of the arrow in FIG. 6A , and can reach the position shown in FIG. 6B after pivoting. In the position shown in Fig. 6B, the pivoting between the backrest link 31 and the seat link 41 is locked. Specifically, for example, a special-shaped ratchet 342 and a special-shaped ratchet can be set at the hinge mechanism 34. At the position shown in FIG. The backrest 3 rotates. Now the angle between the seat part 4 and the backrest part 3 is α, and α is an obtuse angle, and the "predetermined obtuse angle" mentioned in the present invention can be understood as α in Fig. B.

At this time, the pin 341 at the hinge mechanism 34 can enter the slide groove 211 from the front end 211a of the slide groove 211. Afterwards, as shown in Figure 6C, the seat part 4 can be pressed down along the arc-shaped arrow, and the pin 341 can drive the combination of the backrest part 3 and the seat part 4 to slide along the arrow extending along the straight line in Figure 6C. After this operation, the backrest part 3. The combination of the seat part 4 can reach the second use state as shown in Fig. 6D.

In the structure shown in Fig. 6B to Fig. 6D, the backrest connecting rod 31 and the seat part connecting rod 41 are locked to each other at the hinge mechanism 34, and the angle between the backrest part 3 and the seat part 4 is always α.

When it is necessary to change the main body frame 100 from the second use state to the first use state, the seat part 4 can be further pivoted toward the back part 3 along the arrow shown in FIG. The protruding portion disengages from the recessed portion of the ratchet, so that the lock between the seat portion connecting rod 41 and the backrest portion connecting rod 31 can be released.

Referring to Fig. 6E, after the seat part 4 is pivoted along the arrow A, the lock between the seat part connecting rod 41 and the backrest part connecting rod 31 is released. After unlocking, make the pin 341 slide toward the front end 211a in the chute 211 along the arrow B, thereby driving the backrest part 3 and the seat part 4 to the position shown in FIG. 6F, so that the main body frame 100 returns to the first use state .

In summary, it can be seen that the sofa bed of the present invention includes a hinge mechanism, and the hinge mechanism includes first sections that are sequentially connected in a pivotable manner relative to each other (for example, the seat part sleeve 42 and the seat part connection of the above-mentioned embodiment) rod 41), a second section (such as the combination of the backrest insert 32 and the backrest connecting rod 31 of the above-mentioned embodiment), and a third section (such as the driven beam 26 of the above-mentioned embodiment). The first section is fixed on the side of the seat part, the second section is fixed on the side of the backrest, and a protrusion (such as a pin 341) is provided at the junction of the first section and the second section. The armrest frame is provided with a slideway for engaging and guiding the protrusion, the end of the third section opposite to the second section (ie, the end of the driven beam opposite to the backrest connecting rod 31) and the armrest frame to be able to pivotally connected.

In addition to the above-mentioned embodiments, the hinge mechanism of the present invention can also have other preferred settings.

For example, referring to FIGS. 7 and 8 , the hinge mechanism 234 includes a first section 2341 , a second section 2342 and a third section 2343 . The first segment 2341 includes a first segment rod 2341b and a first segment sleeve 2341a, the first segment sleeve 2341a is provided with an opening facing the seat portion, the first segment rod 2341b is placed in the first segment Within the sleeve portion 2341a, the opening and seat portion of the first segment sleeve portion 2341a are secured together to encapsulate the first segment stem portion 2341b. The first section stem portion 2341b and the first section sleeve portion 2341a may be further fastened together by bolts. The second section 2342 includes a second section stem 2342b and a second section sleeve 2342a, the second section sleeve 2342a is provided with an opening toward the backrest, and the second section stem 2342b is placed on the second section Within the sleeve 2342a, the opening of the second section sleeve 2342a and the backrest are secured together to enclose the second section stem 2342b. The first section stem 2341b and the second section stem 2342b are pivotably connected. The second section stem 2342b and the second section sleeve 2342a may also be further fastened together by bolts. One end of the third section 2343 is pivotably connected to the second section cover portion 2342a, and the other end of the third section 2343 is pivotally connected to the armrest frame 202.

The installation and connection relationship between the hinge mechanism and the bottom support structure 210 is shown in Figures 11-13. As shown in the figure, the armrest frame 202 has a reinforcing beam 201, and a slideway 2011 having an opening 2011a is formed on the reinforcing beam. The protrusion 2344 at the junction of the first section 2341 and the second section 2342 can extend from the opening 2011a into the slideway 2011 of the armrest frame 202 and can slide in the slideway 2011. Specifically, the protrusion 2344 slides within the slideway 2011 with the angle locked between the first section 2341 and the second section 2342 .

Fig. 9 and Fig. 10 have shown the schematic diagram of another kind of hinge mechanism of sofa bed according to the present invention. Referring to Fig. 9, the first segment 2351, the second segment 2352 and the third segment 2353 are pivotally connected in sequence. Wherein, the first section 2351 is an integral component, and the second part is also an integral component. Wherein, the first section 2351, the second section 2352 can be seen by cutting the first section 2351, the second section 2352 with a plane perpendicular to the pivoting direction of the first section 2351, the second section 2352 relative to each other, then it can be seen that the first section 2351, the second section Section 2352 is L-shaped in cross-section. In order to make the first segment 2351 and the second segment 2352 formed into an L-shaped section have better stability, a reinforcing part 2355 is provided at the angle between the two walls forming the L-shape, and the reinforcing part 2355 is a plurality of And it is arranged along the extension direction of the first section 2351 and the second section 2352 . The junction of the first section 2351 and the second section 2352 is provided with a protrusion 2354 that can cooperate with the slideway.

14-22 show another preferred embodiment according to the present invention.

Referring to Fig. 14 and Fig. 15, the sofa bed comprises a main body frame 200 and an armrest frame 202, and a seat part 204 and a back part 203 of the main body frame 200 can be transformed between a sofa configuration and a bed configuration.

Fig. 16 shows a schematic diagram of the bottom support structure 210 of the sofa bed in Fig. 14 and Fig. 15 after the main frame 200 is removed. Wherein the bottom support structure 210 includes a support tube 203 extending generally along the transverse direction, and there may be one, two or more support tubes 203. In this embodiment, the support rod 203 is a possible structure of the bracket, and in other unshown embodiments, the bracket may also have other structures. The support tube 203 is provided with a first support structure and a second support structure configured to support the seat portion 204 and the back portion 203 when the body frame 200 is in the bed configuration. Connection; the second support structure is configured to support both the seat portion 204 and the back portion 203 when the body frame 200 is in the sofa configuration.

Referring to Fig. 17, specific to this embodiment, the body 2031 of the support tube extends in the transverse direction of the seat portion 204 and the backrest portion 203, and the body 2031 of the support tube includes a first section 2031a of the support tube, a second section of the support tube connected in sequence. Section 2031b and the third section 2031c of the support tube, the body 2031 of the support tube is provided with a support block 2032, the lower end of the support block 2032 may have a U-shaped opening 2032a, and the U-shaped opening 2032a can be snapped onto the body 2031 of the support tube , and the support block 2032 may have a riveting hole for matching with the body 2031 of the support tube, and the support block 2031a may be installed on the body of the support rod by welding or riveting.

With reference to the state when the main body frame 200 is in the bed configuration as shown in FIGS. 18 and 19 , the support block 2032 is located at the junction of the seat portion 204 and the backrest portion 203 (the longitudinal end of the junction is provided with a hinge mechanism 234) The seat part 204 and the back part 203 are supported simultaneously, so that the main body frame 200 is stably located in the bed configuration. That is to say, in this embodiment, the support block 2032 constitutes the first support structure of the support rod.

Referring to the state when the main body frame 200 is in the sofa configuration as shown in FIG. 20 and FIG. The second section 2031b of the tube 203 is supported against the surface of the backrest part 203 away from the seat part 204, that is to say, the first section 2031a of the support rod and the second section 2031b of the support tube 203 face the main frame. The surfaces of 200 together constitute the second support structure of the support rod.

Preferably, continuing to refer to Fig. 20, both the backrest portion 203 and the seat portion 204 include a plurality of longitudinal beams 220 extending along the longitudinal direction. Referring to FIG. 22, the support block 2032 is configured such that the support block 2032 is positioned in front of a longitudinal beam 220 of the seat portion 204 when the body frame 200 is in the bed configuration so as to limit the seat portion 204 forwardly. slip. 18 and 19, when the main body frame 200 is in the bed configuration, the longitudinal beam of the backrest 203 closest to the seat 204 and the longitudinal beam of the seat 204 closest to the backrest 203 are closely attached to each other, Support blocks 2032 contact and support the two longitudinal beams.

As contrast with the present invention, Fig. 23 has shown a kind of limit support structure of existing sofa bed. It can be seen that in this structure, the limit fixture 205' is set on the legs 230' to support the bed board 204' of the sofa configuration, but this support structure cannot support the bed board when the bed board is in the bed configuration. The present invention overcomes this defective, and the present invention is provided with support tube as shown in Figure 17, and sofa bed among the present invention need not be provided with this traditional position-limiting and fixing structure as shown in Figure 23. Of course, the present invention can also be provided with a position-limiting support structure as shown in Figure 23.

Preferably, turning back to Figure 16 and Figure 17, the bottom support structure 210 includes two longitudinal bottom support structure tubes respectively located at the two most edges in the transverse direction, and the two ends of the body 2031 of the support tube are respectively provided with openings Downward U-shaped portion 2033, when the support tube 203 is installed on the bottom support structure 210, the two U-shaped portions 2033 of the support tube 203 are respectively fitted in the two longitudinal bottom supports on the structural tube.

24-29 show another preferred embodiment according to the present invention. Referring to FIG. 24 , the sofa bed includes a main body frame composed of a seat portion 203 and a backrest portion 204, and an armrest frame 202. Both the seat portion 203 and the back portion 204 include a mesh structure.

FIG. 25 may be a separate schematic view of the seat portion 203 or the back portion 204 in FIG. 24 , and both the seat portion 203 and the back portion 204 may include a main body unit 205 . For purposes of example, FIG. 25 is the seat portion 203 of FIG. 24 . Wherein, the seat portion 203 includes two main body units 205 arranged longitudinally, and each main body unit 205 includes a unit frame 301 and a unit net plate 302. Referring to Figure 26, the unit frame 301 is provided with a circle of steps 3011 around the body of the unit frame 301 and located at its inner edge. This circle of steps 3011 can be provided intermittently or continuously. The unit net plate 302 includes a circle of edge ribs located at its edge, the unit net plate 302 is mounted on the unit frame 301 in a detachable manner and the edge ribs are fitly placed on the step 3011.

Fig. 27 and Fig. 28 have shown the schematic diagram after unit net board 302 is removed from unit frame 301, and Fig. 29 has shown the schematic diagram that unit net board 302 is installed on unit frame 301. As can be seen from Fig. 28 and Fig. 29, the unit frame 301 is also equipped with a plectrum 303, and the plectrum 303 is configured to be operable to stop at the top of the edge rib to prevent the unit net plate 302 from The unit frame 301 is moved between a first position (as shown in FIG. 29 ) and a second position (as shown in FIG. 28 ) allowing the unit grid 302 to be disengaged from the unit frame 301 .

Preferably, the paddle 303 is configured to be connected to the unit frame 301 via a pin 304 perpendicular to the overall extension direction of the main body unit 205 and to be able to rotate around the pin 304.

Also preferably, each of the main body units 205 is a polygonal structure, and the pick piece 303 is provided at each corner of the polygonal structure. In this embodiment, each main body unit 205 is rectangular.

Referring to Figures 28 and 29, the plectrum 303 is roughly formed into an L-shaped structure, and in the second position as shown in Figure 28: the extension direction of the two sections forming the L-shaped structure and each side of the unit frame 301 None of them are parallel, and one side facing the pick piece 303 and the unit net plate 302 is parallel to the corresponding side of the unit frame 301 . In the first position as shown in FIG. 29 , the extension directions of the two sections constituting the L-shaped structure are parallel to the corresponding sides of the unit frame 301 . Such setting is different from the conventional setting, so that the plectrum 303 can completely give up the space for the unit net plate 302 to move when in the second position, and can also stably limit the unit net plate 302 when in the first position.

As shown in Figure 24, the seat portion 203 and the back portion 204 are all formed into a rectangular structure, and the respective longitudinal edges of the seat portion 203 and the back portion 204 are butted together, and the seat portion 203 and the Each of the backrest parts 204 includes two of the main body units 205 arranged along the longitudinal direction thereof. That is to say, the sofa bed includes four main body units 205 arranged in an array, wherein a pair of main body units 205 arranged side by side in the longitudinal direction constitute the seat portion 203, and another pair of main body units 205 arranged side by side in the longitudinal direction form the backrest Section 204.

30-37 show another preferred embodiment according to the present invention.

Referring to Fig. 30 and Fig. 31, the armrest frame 202 of the sofa bed can be disassembled from the main body of the sofa bed, and the armrest frame 202 itself can be further disassembled. The armrest frame 202 comprises a substantially U-shaped armrest frame body and a reinforcing beam 201 detachably connected between two legs of the armrest frame body, wherein two ends of the reinforcing beam 201 are provided with tongues part 2012, and the two tongue parts 2012 are respectively detachably engaged on the two legs. A slideway 2011 is formed on the reinforcing beam 201 .

In order to facilitate the positioning and installation of the reinforcing beam 201 on the armrest frame body, the armrest frame body is also provided with a locking hole 2021, and the end of the reinforcing beam 201 can be provided with a small protrusion, which can cooperate with the locking hole 2021 to Achieve positioning.

Preferably, referring to Fig. 32-Fig. 34, the armrest frame body can be further disassembled and/or folded. That is to say, Fig. 32-Fig. 34 have shown two kinds of accommodating modes that can be realized on the same armrest frame body at the same time.

The armrest frame body includes a plurality of sections 202a connected in sequence, one end of one section 202a in any two adjacent sections 202a has an opening, and the end of the other section 202a extends into the opening to The two adjacent sections 202a are connected. Each section 202a is disassembled and stored in one of two ways.

The legs and the connection section are connected by a pivot 203a, and the armrest frame body is configured so that the two legs can pivot and fold relative to the connection section between the two legs so that the armrest The frame body is in a folded state as shown in FIG. 34 . Referring to Fig. 33, the joint between the section 202c of the leg and the section 202c of the connecting section specifically includes a shaft 202f, a spacer 202e and a plastic cover 202d encapsulating the shaft 202f and the spacer 202e. The pivotal storage of the legs and the connecting section is the other of the two storage modes.

The structure of the armrest frame after only adopting the second storage mode without adopting the first storage mode is shown in Fig. 34 .

Referring to Fig. 36 and Fig. 37, the cross-section of the legs is rectangular, the cross-section of the tongue portion 2012 is L-shaped, and the tongue portion 2012 is attached to two adjacent sides of the legs. Moreover, the sofa bed also includes a bottom support structure 210 positioned and supported below the main body frame, the bottom support structure 210 includes a bottom support structure longitudinal beam connected between the two armrest frames 202, and for For each armrest frame 202, its tongue portion 2012 includes the first part of the tongue portion 2012 facing the other armrest frame 202 and attached to the leg, and the longitudinal beam of the bottom supporting structure is fixed by The tongue portion 2012 is connected to the armrest frame 202 on the first part (realized by bolts 2014 ).

As an alternative to the L-shaped tongue in section, Fig. 35 shows another reinforcing beam 201, on which a slideway 2011 is arranged. The cross-section of the tongue portion 2013 of the reinforcing beam 201 is U-shaped, and the tongue portion 2013 can be attached to two adjacent sides of the supporting leg and the surface between the two adjacent sides.

38A-47 show schematic diagrams according to another preferred embodiment of the present invention. The sofa bed may also include a plurality of elastic modules mounted in an array on the seat portion and the back portion.

FIG. 39 shows an exploded view of an elastic module 400 . Each elastic module 400 includes a conical spring 403 and a spring bracket 402 for accommodating the conical spring. The spring bracket 402 includes a bottom 401 capable of cooperating with the main frame of the sofa bed.

In this embodiment, the seat portion 204 and the backrest portion 203 can each constitute a main frame, or both of them together constitute a main frame. The main frame is formed with slide rails that can engage with the bottom of the spring bracket, so that a plurality of elastic modules 400 can slide on the slide rails, and the main frame can be folded with each other along a fold line perpendicular to the extending direction of the slide rails. Switch between the folded state and the use state. When the main frame is in the folded state, the slide rail forms a slide rail opening 53 at the fold line, and when the main frame is in the use state, the slide rail opening 53 is closed. The slide rails on the main frame are configured so that when the main frame is folded, a plurality of elastic modules 400 can be mounted to the slide rails from the outside of the main frame through the slide rail opening 53 and slide towards the ends of the slide rails, so that the main body frame A plurality of elastic modules 400 are densely arranged on the side facing the user.

It should be noted that the "folded state" mentioned herein refers to the position where the main frame is folded in half along the fold line so that the opening 53 of the slide rail is exposed. When the main frame is in the folded state, the sofa bed cannot be used. Yes, the sofa bed is neither used as a bed nor a sofa at this time. The "used state" mentioned herein refers to the position where the main frame is laid flat so that the opening 53 of the slide rail is closed. The sofa bed can be used in the used state. At this time, the sofa bed can be used as a sofa or Make a bed.

FIG. 40 shows a possible configuration of the seat part 204 or the backrest part 203 . For exemplary purposes, Fig. 40 shows the seat portion 204, each of the seat portion 204 is mounted with an odd number of elastic modules 400 on the slide rails extending in the longitudinal direction, and the fold line is relative to the longitudinal direction of the main body frame. Center position offset. 41-46 show a schematic view of the process of installing the elastic module 400 on the main frame to finally obtain the structure shown in FIG. 40 .

Referring to Fig. 41, the main body frame is folded in half along the fold line, and the two folded portions 50 folded in half each other—the first folded portion 50a and the second folded portion 50b have different longitudinal dimensions (i.e., dimensions along their respective longitudinal extensions). Taking the first folding part 50a as an example, the first folding part 50a includes a plurality of longitudinal beams 52 (ie track beams), any adjacent two longitudinal beams 52 are jointly formed into a slide rail, and each slide rail has a The opening 53 at the folded position of the folded portion 50a and the second folded portion 50b.

Referring to Fig. 42, the elastic module 400 can be installed into the slide rail from the opening 53 of the slide rail and slide on the slide rail. The bottom of the elastic module 400 cooperates with the slide rail, so that the elastic module 400 can slide on the slide rail, and can not disengage from the slide rail at other positions except the opening 53. The state after one slide rail of the first folded portion 50a is covered with elastic modules 400 is shown in FIG. 43 , and the state after all slide rails of the first folded portion 50a are covered with elastic modules 400 is shown in FIG. 44 Shows. In Fig. 44, no slide rail is installed on the second folded portion 50b, and the second folded portion 50b also has a plurality of longitudinal beams 52, and any two adjacent longitudinal beams 52 form a slide rail.

Fig. 45 shows a schematic diagram of elastic modules 400 covering a slide rail on the second folded part 50b. It can be seen that the elastic module 400 is also installed into the slide rail from the opening 53 of the slide rail of the second folding part 50b. The state in which the elastic modules 400 are covered on the second folded portion 50b is shown in FIG. 46 . In Fig. 46, the first folded part 50a and the second folded part 50b have been covered with elastic modules 400, and the first folded part 50a and the second folded part 50b can be folded according to the arrow shown in the figure to make the seat part 204 is re-tiled, and the opening 53 of the slide rail will be closed after re-tiling, and the elastic module 400 cannot be taken out from the seat portion 204.

It can be seen from FIG. 46 that a maximum of 7 elastic modules 400 can be installed on each slide rail of the first folding part 50a, and a maximum of 6 elastic modules 400 can be installed on each slide rail of the second folding part 50b. The elastic module 400 that can be installed on each slide rail of the folding part 50a is only one more than the elastic module 400 that can be installed at most on each slide rail of the second folding part 50b, so a complete slide rail of the final seat part 204 ( The number of elastic modules 400 that can be accommodated at most must be an odd number. Such an arrangement can make the longitudinal dimension of the main frame (that is, the longitudinal dimension of the first folded portion 50a) the smallest when it is in the folded state, so that the main frame in the folded state occupies the smallest area when it is stored. Of course, if the occupied area in the folded state is not considered, the first folded portion 50a and the second folded portion 50b can also be set so that the maximum load capacity of each slide rail is quite different.

Turning back to FIG. 40 , in the at least two folded portions, any two adjacent folded portions in the longitudinal direction are butted together by a transversely extending beam and can pivot relative to each other around a transversely extending axis so as to Realize that two adjacent folding parts are folded relative to each other, and the track beams of the two adjacent folding parts are aligned in the longitudinal direction but can be spaced apart at the fold line (of course, there can be no interval), the size of the interval It is configured to not allow the elastic module 400 to disengage from the slide rail from the gap in the folded state.

FIG. 47 shows a further possible configuration of the seat or backrest. For exemplary purposes, Fig. 47 shows a seat portion, each of which has an even number of elastic modules 400 installed on the slide rails extending in the longitudinal direction. Referring to Fig. 47, the fold line 51 is located at the middle position in the longitudinal direction, that is, the longitudinal dimensions of the two folded portions 50 folded in half along the fold line 51 are equal. Figure 48 shows the state of the main body frame in Figure 47 after being folded in half along the fold line 51. It can be seen that each folded part 50 includes a plurality of longitudinal beams 52, and two adjacent longitudinal beams 52 jointly form a slide rail Each slide rail forms an opening 53 at the position of the fold line 51 , and the elastic module 400 can be installed into the slide rail from the opening 53 .

Fig. 49 shows a schematic diagram after the main frame in Fig. 48 is covered with elastic modules 400, and each slide rail of each folded part 50 in the two folded parts 50 folded in half along the folded line 51 can accommodate up to 7 elastic modules. Module 400. That is to say, the number of elastic modules 400 that can be accommodated at most on each slide rail of the two folded parts 50 folded in half along the fold line 51 is equal, so a complete slide rail of the final seat portion (by the first folded part 50 The number of elastic modules 400 that can be accommodated at most must be an even number. Such an arrangement can make the longitudinal dimension of the main frame (that is, the longitudinal dimension of the first folded portion 50) the smallest when it is in the folded state, so that the main frame in the folded state occupies the smallest area when it is stored. Of course, if the occupied area in the folded state is not considered, the first folded portion 50 and the second folded portion 50 can also be set so that each slide rail can carry different loads at most.

Although one main body frame in the embodiment shown in Fig. 40-Fig. 50, any two adjacent folded parts 50 can be folded relative to each other so as to open the opening 53 of the slide rail, and flattened relative to each other so as to close the opening 53 of the slide rail. That is to say, if there are multiple folded parts 50, the structures of any two adjacent folded parts 50 can be similar to those shown in Figures 40-49.

Figures 50-63 illustrate other possible implementations of mounting elastic modules.

Referring to FIG. 50 , the sofa bed includes a main body frame and a plurality of elastic modules 400 . The body frame may include a seat portion and/or a back portion. The body frame may in turn include a plurality of body units 50a. Specifically, the seat portion includes two main body units 50a arranged longitudinally, and the backrest portion also includes two main body units 50a arranged longitudinally. Each main body unit 50a includes a plurality of longitudinal beams extending longitudinally, and the longitudinal beams may also be referred to as slide rail beams. Any adjacent two slide rail beams 52 can jointly form a slide rail. Moreover, the two slide rail beams 52 of each slide rail are provided with a first buckle structure extending along it as a whole, and the bottom of the spring bracket is provided with a second buckle structure 404, and the elastic module 400 can be perpendicular to the The plane defined by the extension directions of the slide rail beams 52 is press-fitted to the slide rail. When the elastic module 400 is installed on the slide rail, the first buckle structure and the second buckle structure 404 snap fit with each other to only allow the elastic module 400 to move relative to the slide rail beam 52 in a sliding manner along the slide rail.

It can be understood that when the elastic module 400 is pressed and mounted to the slide rail perpendicular to the plane defined by the extension directions of the two slide rail beams 52 (that is, downward), the elastic module 400 contacts the slide rail beam 52 The part of the base 401 will be slightly deformed, and the deformation will disappear after the installation is completed, so that the elastic module 400 cannot be separated from the slide rail. In other words, when the elastic module 400 is not installed on the slide rail, the structure of the base 401 of the elastic module 400 interferes with the slide rail beam 52, if no downward pressure is applied to the elastic module 400 to deform it, then The elastic module 400 cannot be installed on the slide rail.

Preferably, referring to FIG. 53 , the first buckle structure includes a groove 52a extending along the slide rail beam 52 (that is, extending perpendicular to the paper direction of FIG. 53 ) on the top surface of the track beam 52, and the second buckle structure 404 The elastic module 400 includes a protrusion 52a protruding outward from the top surface of the base 401 toward the groove 52a.

Preferably, continuing to refer to FIG. 53, the first buckle structure further includes a bottom surface 52b of the slide rail beam, the second buckle structure 404 includes an extension structure protruding downward from the base 401, and the bottom of the extension structure is provided with an outwardly protruding The buckle 404b is configured to be able to be buckled on the bottom surface 52b of the slide rail beam. In addition, two extension structures and a protrusion 52a between the two extension structures are provided on one side of the base 401 that is connected to the slide rail beam 52 .

More preferably, referring to FIGS. 53, 55, and 56 at the same time, the width of the groove 52a is configured to accommodate two of the protrusions 52a side by side, so that the two sides of each of the two sides of the slide rail beam 52 The respective protrusions 52a of the two elastic modules 400 can slide in the grooves 52a independently relative to each other. That is to say, the slide rail beam 52 is configured so that the first buckle structure can simultaneously engage the second buckle structures 404 of the two elastic modules 400 on both sides of the slide rail beam 52 , and in the engaged state, the two elastic modules 400 on both sides of the slide rail beam 52 can slide independently relative to each other along their respective tracks.

The cross-sectional configuration of the slide rail beam 52 may also have other preferred settings. For example, referring to FIG. 54B and FIG. 54C, a groove 52a is also provided on the bottom surface 52b of the slide rail beam, and the buckle 404b is configured to be hooked into the groove 52a. And, the groove 52a on the bottom surface 52b of the described slide rail beam and the groove 52a on the top surface are arranged symmetrically, and the described slide rail beam 52 is configured as about by the top surface of the described slide rail beam 52 The bottommost end of the groove 52a on the upper surface and the uppermost end of the groove 52a on the bottom surface 52b of the slide rail beam are jointly defined to be symmetrical to a plane. As shown in FIG. 54C, the left and right sides of the slide rail beam 52 are planes, or as shown in FIG. 54B, the left and right sides of the slide rail beam 52 are convex arc surfaces, and the elastic module 400 The portion of the base 401 corresponding to the convex arc surface is a concave arc surface.

Or, in other unshown embodiments, the first buckle structure includes a protrusion 52 a extending along the slide rail beam 52 on the top surface of the slide rail beam 52 , and the second buckle The structure 404 includes a groove 52 a facing the protrusion 52 a provided at the edge of the top surface of the base 401 of the elastic module 400 .

Fig. 57-Fig. 63 show the schematic diagram of the process of installing the elastic module 400 on the bed frame of the sofa bed. First, an elastic module 400 is pressed down to the slide rail formed by a pair of slide rail beams 52, and after the elastic module 400 is installed on the slide rail, the elastic module 400 can slide longitudinally on the slide rail. Afterwards, subsequent elastic modules 400 can be installed on the slide rails, as shown in FIGS. 58-59 . Referring to Fig. 61, while the elastic module 400 is installed on one slide rail, the elastic module 400 can be installed on other slide rails in a pressing manner at the same time, and the elastic module 400 of the adjacent slide rail will be connected to the same slide rail beam 52, but the elastic modules 400 on adjacent slide rails can slide independently relative to each other, and their respective sliding will not affect each other. Fig. 62 shows a schematic diagram of a main body unit 50a of the seat part or the back part having been installed and all elastic modules 400 have been installed, and Fig. 63 shows that two main body units 50a of the seat part or the back part have been installed and all elastic modules have been installed 400 schematic.

It should be noted that all the implementations mentioned in the present invention can be combined, and any technical solution obtained by combining any two or more implementations is within the scope of protection claimed in the present invention. For example, there may be a sofa bed, which not only has the bracket shown in Figures 16-23, but also has the unit structure of the mesh panel and the unit frame as shown in Figures 24-26, and has the same structure as shown in Figures 30-37. The foldable or detachable armrest frame shown, and the elastic module can also be installed in the manner shown in Figure 38A-Figure 49, and/or the elastic module can be installed in the manner shown in Figure 50-Figure 63. It should be further explained that the installation methods of the elastic modules shown in Figure 38A-Figure 49 do not conflict with the installation methods of the elastic modules shown in Figure 50-Figure 63, and the two can exist at the same time, that is to say, the elastic module Can be installed on the sofa bed in two ways.

The switch between the two use states of the sofa bed provided by the invention is easy to realize and convenient to operate. And in the predetermined switching process and the predetermined use process, the angle between the seat part and the back part can be locked to improve the reliability of the operation; Sliding in the chute can also reduce the user's operating burden and realize switching operations quickly and labor-saving. In order to realize the switching of the main frame between the sofa configuration and the bed configuration, a hinge in the form of three sections is provided at the junction of the backrest and the seat; a support tube is also provided on the bottom support structure of the sofa bed, which can be used in both The main frame is supported when the sofa bed is used as a sofa and can also be supported when the sofa bed is used as a bed; the main frame can include a bed frame and a steel wire mesh panel, which can be skillfully joined and disassembled; the armrest frame can also be disassembled Folds for easy storage and transport. Moreover, a plurality of detachable elastic modules can be arranged on the sofa bed, and the installation of the elastic modules is relatively simple and easy to operate, and the user can manually install them to obtain a sofa bed with better comfort. In order to install the spring module, the main frame is set to be folded in half, and the slideway for installing the spring module is opened at the folded place to allow the spring module to enter the slideway. When the main frame is re-tiled, the opening is closed to prevent the spring module from falling off; the spring The modules can also be configured to be pressed directly onto the track from top to bottom, such that adjacent spring modules do not interfere with each other.

The foregoing description of various embodiments of the present invention are presented for purposes of illustration to one of ordinary skill in the relevant art. It is not intended that the invention be exclusive or limited to a single disclosed embodiment. As noted above, many alternatives and modifications to the present invention will be apparent to those skilled in the art of the above teachings. Thus, while a few alternative implementations have been described in detail, other implementations will be apparent or relatively readily developed by those of ordinary skill in the art. The present invention is intended to embrace all alternatives, modifications and variations of the invention described herein, as well as other embodiments that fall within the spirit and scope of the invention described above.

Claims (9)

1. a sofa bed, is characterized in that, described sofa bed comprises a plurality of main body units, and each main body unit comprises: A unit frame, the inner upper edge of the unit frame is formed with a stepped portion; a unit net plate, the unit net plate includes a frame formed around its outer edge, the frame can be placed on the step portion of the unit frame, Wherein, a plurality of paddles are installed around the unit frame, and the paddles are configured to be operated to move between a first position and a second position. In the first position, the paddles Covering the top of the frame to prevent the cell mesh from disengaging from the cell frame; in the second position, the paddle is clear of the top of the frame to allow the cell mesh to be removed from the cell Frame removed. 2 . The sofa bed according to claim 1 , wherein the pick piece is connected to the unit frame via a pin perpendicular to the overall extension direction of the main body unit and can rotate around the pin. 3 . 3 . The sofa bed according to claim 1 , wherein each of the main body units is a polygonal structure, and each corner of the polygonal structure is provided with the pick piece. 4 . 4. The sofa bed according to any one of claims 1-3, wherein the sofa bed body comprises a seat portion and a back portion disposed adjacent to each other, the seat portion and the back portion being capable of surrounding a hinge A mechanism folds or lays flat such that the main body of the sofa bed transforms between a bed configuration and a sofa configuration, the seat portion and the back portion each comprising at least one of the main body units. 5. The sofa bed according to claim 4, characterized in that, the seat portion and the back portion are all formed into a rectangular structure, and respective longitudinal edges of the seat portion and the back portion are butted together, and the The seat portion and the back portion each include two of the main body units arranged in a longitudinal direction thereof. 6. The sofa bed according to claim 4, characterized in that, the sofa bed comprises an armrest frame, and the armrest frame is respectively arranged on both sides of the sofa bed body along the longitudinal direction, and is connected with the hinge mechanism through the hinge mechanism. The main body of the sofa bed is connected, wherein a slideway is formed on each of the armrest frames, so that the movement of the hinge mechanism is guided by the slideway, Wherein, the sofa bed is configured to lock the backrest at a predetermined angle relative to the seat when the backrest and the seat pivot relative to each other around the hinge mechanism, and in the locked state The hinge mechanism can drive the main body of the sofa bed to move under the guidance of the slideway. 7. The sofa bed according to claim 4, wherein the hinge mechanism comprises: a seat portion connecting rod attached to and extending along a lateral side edge of the seat portion; a backrest connecting rod attached to a lateral edge of the backrest on the same side as the lateral side edge of the seat portion and extending along the lateral side edge of the backrest; A pivot connecting the seat portion connecting rod and the back portion connecting rod such that the back portion and the seat portion can pivot relative to each other. 8. The sofa bed according to claim 4, wherein the sofa bed body is configured to release the seat portion when the seat portion is operated to pivot toward the backrest in the locked state. Locking between the connecting rod and the backrest connecting rod. 9. The sofa bed according to claim 8, wherein a ratchet is arranged on one of the connecting rod of the seat part and the connecting rod of the back part, and the connecting rod of the seat part and the connecting rod of the back part The other one is provided with a pawl, and the ratchet and the pawl cooperate with each other so that the backrest is locked at a predetermined angle relative to the seat.

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