CN213487951U

CN213487951U - Stretching type sofa bed structure

Info

Publication number: CN213487951U
Application number: CN202021229513.7U
Authority: CN
Inventors: 黄发金; 章亮; 朱正领; 黄传胜
Original assignee: Anji Yongyi Shangpin Furniture Co ltd
Current assignee: Anji Yongyi Shangpin Furniture Co ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-06-22
Anticipated expiration: 2030-06-29

Abstract

The utility model discloses a stretching sofa bed structure, which comprises a backrest component, a bottom frame, a first bed board frame and a second bed board frame, wherein guiding devices are arranged between the first bed board frame and the bottom frame and between the first bed board frame and the second bed board frame, and a front roller, a rear roller, a front slope and a rear slope are arranged on the first bed board frame and the bottom frame; in a furled state, the roller is positioned on a slope, the first bed board frame is in a raised state and is stacked right above the bottom frame, and the second bed board frame is stacked between the first bed board frame and the bottom frame; when the second bed board frame stretches out, the second bed board frame is linked with the first bed board frame, so that the front and rear rollers on the first bed board frame slide down to form a front slope and a rear slope, and the first bed board frame descends and is at the same height as the second bed board frame; the first bed board frame, the second bed board frame and the bottom frame can be quickly stacked and unfolded through the rollers, and the sofa bed can be simply and quickly changed among states.

Description

Stretching type sofa bed structure

Technical Field

The utility model relates to a sofa field, in particular to stretching type sofa bed structure.

Background

A sofa bed is a multi-purpose furniture that can be converted between a sofa state and a bed state, and is popular with more and more consumers. When the existing sofa bed is converted from the sofa state to the bed state, a single extension frame is generally pulled out from the sofa, and one of two layers of sofa cushions is turned over and pressed on the extension frame to realize the bed state. However, the structure only can extend an extra bed board frame outwards, the length of the finally formed sofa bed is limited compared with that of a normal bed, the length of the finally formed sofa bed cannot reach the length of a normal household bed, most sofa beds are troublesome to stretch when in use, and much time is needed in the state conversion process.

CN 201621054492.3's chinese utility model discloses a "sofa bed frame with extend and folding function", this sofa bed frame includes base, back, cushion and expansion bracket, the back with the rear end of base is rotated and is connected, the cushion is established the base top, the expansion bracket is established between base and the cushion, still be equipped with the rotation connecting rod between base and the cushion, the upper and lower both ends of rotating the connecting rod respectively with cushion and base rotate to be connected, be equipped with between expansion bracket and the cushion and lead smooth device, the front end of expansion bracket is equipped with the truckle subassembly. The backrest of the sofa can be rotated, so that the sofa bed is extremely space-saving when folded and the length of the sofa bed can be expanded when unfolded; the telescopic frame and the cushion are connected by adopting a heavy guide rail and roller structure so as to realize the extension and folding functions of the sofa bed; although the sofa frame can be unfolded to form a sofa bed with a certain length, the conversion structure is complicated, and the sofa frame needs to be stretched and rotated at the same time during sofa conversion, so that a lot of time is needed.

Disclosure of Invention

The utility model overcomes exist not enough among the above-mentioned prior art, provide a sofa bed structure with a plurality of bed board frames, through setting up gyro wheel and guider between the frame for can fold each other and tensile slip, thereby make when needs, can be rapid tensile convert the sofa into the bed body that has sufficient length.

The technical scheme of the utility model is realized like this:

a stretching sofa bed structure comprises a backrest assembly, a bottom frame, a first bed board frame and a second bed board frame, wherein the backrest assembly is arranged at one end of the bottom frame and is in rotating fit with the bottom frame; the first bed board frame is provided with a front roller and a rear roller, and the bottom frame is correspondingly provided with a front slope and a rear slope; in a furled state, the front idler wheel and the rear idler wheel of the first bed board frame are positioned on the front slope and the rear slope of the bottom frame, the first bed board frame is in a raised state and is stacked right above the bottom frame, and the second bed board frame is stacked between the first bed board frame and the bottom frame along the vertical direction; when the bed board frame is in a stretching state, the second bed board frame extends outwards completely and then is linked with the first bed board frame, so that the front roller and the rear roller on the first bed board frame slide down the front slope and the rear slope of the bottom frame, and the first bed board frame descends and is at the same height as the second bed board frame; and when the first bed board frame extends outwards completely, the backrest assembly is overturned around the bottom frame and poured into the bottom frame.

The utility model discloses a stretching sofa bed structure, the guiding device that can stretch and slide is arranged between the first bed board frame and the bottom frame and between the first bed board frame and the second bed board frame, and the first bed board frame is provided with a front roller and a rear roller, the bottom frame is correspondingly provided with a front slope and a rear slope; through the design, the first bed board frame, the bottom frame and the second bed board frame can be completely stacked and extended, and the overall state conversion process of the sofa is simple and labor-saving.

Preferably, first bed board frame and second bed board frame between be equipped with first guider, first guider include first guide bar and first stand pipe, first stand pipe and first stand pipe cup joint the cooperation, first guide bar set up on one of them of first bed board frame or second bed board frame, first stand pipe then sets up on another in second bed board frame or first bed board frame. Through setting up guider make between first bed board frame and the second bed board frame slidable each other, simple structure is ingenious.

Preferably, the first guide rod is arranged at the lower end of the first bed board frame, the connecting end of the first guide rod is fixed at the rear lower part of the first bed board frame through a guide rod connecting seat, the other end of the first guide rod is clamped into a guide rod clamping seat, the guide rod clamping seat is arranged at the front end of the first bed board frame, and the first guide pipe is connected and fixed on the second bed board frame through a guide pipe connecting seat. Thus, one end of the guide rod is fixed, and the other end of the guide rod has a certain up-down adjusting range when sliding between the components.

Preferably, a second guide device is arranged between the first bed board frame and the bottom frame, the second guide device comprises a second guide rod and a second guide pipe, the second guide pipe is in sleeve joint with the second guide rod, the second guide rod is arranged on one of the first bed board frame or the bottom frame, and the second guide pipe is arranged on the other of the bottom frame or the first bed board frame.

Preferably, the second guide rod is arranged at the lower end of the first bed board frame, the connecting end of the second guide rod is fixed at the rear lower part of the first bed board frame through a guide rod connecting seat, the other end of the second guide rod is clamped into a guide rod clamping seat, and the second guide pipe is connected and fixed on the bottom frame through a guide pipe connecting seat.

Preferably, the first bed board frame comprises a first frame body, a front support framework and a rear support framework, the front support framework comprises a front cross rod, two ends of the front cross rod are respectively connected with a side plate, the top end of the side plate is fixedly connected with the first frame body, and the guide rod clamping seats are arranged on the front cross rod in a bilateral symmetry mode. Through the guide bar cassette, play the effect of injecing the guide bar and sliding spacing simultaneously.

Preferably, the first frame body comprises a front cross bar and a rear cross bar of the first frame body, and a left vertical bar and a right vertical bar of the first frame body; the front rollers are arranged right below the left and right vertical rods of the first frame body, and the rear rollers are arranged at two ends of the left and right vertical rods of the first frame body; the front roller is positioned on the front slope, and the rear roller is positioned on the rear slope. Through ingenious setting up gyro wheel and slope for the conversion is more light laborsaving with the reset process.

Preferably, the bottom frame comprises a front bottom cross rod, a rear bottom cross rod, a left bottom longitudinal rod and a right bottom longitudinal rod, the rear slope is a trapezoidal slope with slopes at the front and the rear, and the bottom end of the rear slope is fixed right above the left bottom longitudinal rod and the right bottom longitudinal rod; the position of the front slope is configured not to obstruct the drawing of the first bed board frame. Through setting up trapezoidal slope, the gyro wheel can enough let the slip on the slope, and the slope has the effect of a screens to the gyro wheel when the sofa draws in.

Preferably, the front slopes are connected and fixed on the inner sides of the left and right bottom vertical rods. The pulling and pulling of the first bed board frame can not be influenced and the single action can be realized by arranging the first bed board frame at the inner side of the longitudinal rod.

Preferably, the second bed board frame comprises a second frame body and a front baffle, the second frame body is of a square structure and comprises a transverse baffle rod and longitudinal baffle rods, the transverse baffle rod is opposite to the front end and the rear end, the longitudinal baffle rods are spaced from each other at the left end and the right end, and the longitudinal baffle rods at the left end and the right end are connected with support side plates extending downwards.

Preferably, the rear transverse baffle plate also comprises an auxiliary supporting plate which is positioned below the transverse baffle plate and protrudes backwards from the rear transverse baffle plate. The auxiliary supporting plate can play a supporting force for the first bed board frame when the sofa is unfolded.

Preferably, the auxiliary support plate is located at a middle position of the second frame body and extends forward to be connected with the front baffle. The design of the auxiliary supporting plate is long enough, so that the structure is more stable.

Preferably, the backrest assembly is in rotating fit with the bottom frame through a rotating connecting plate, the rotating connecting plate is connected and fixed at the rear end of the bottom frame, and the backrest assembly is in rotating fit with the rotating connecting plate through a rotating shaft. The backrest module can be finally simply and quickly poured into the base frame by rotating the connecting plate.

Preferably, a limiting mechanism is arranged between the rotating connecting plate and the backrest assembly, the limiting mechanism comprises a limiting pin and an arc-shaped limiting groove formed in the rotating connecting plate, and the limiting pin is connected and fixed to the backrest assembly after being matched with the limiting groove.

Preferably, the first bed board frame and the second bed board frame are both provided with pulley devices capable of sliding along the ground. The pulley device can play a role in supporting the whole body and can be stretched more easily.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

compared with the prior art, the stretching sofa bed structure is provided with the guiding devices which can stretch and slide between the first bed board frame and the bottom frame and between the first bed board frame and the second bed board frame, so that the three can be completely stacked and stretched, and a bed body with enough length can be obtained when the sofa is stretched; the first bed board frame is ingeniously provided with a front roller and a rear roller, the bottom frame is correspondingly provided with a front slope and a rear slope, the rollers are positioned on the slopes in a furled state, the first bed board frame is in a raised state and is stacked right above the bottom frame, and the second bed board frame is stacked between the first bed board frame and the bottom frame along the vertical direction; when the second bed board frame stretches outwards completely, the second bed board frame is linked with the first bed board frame after stretching outwards, so that the front roller and the rear roller on the first bed board frame both slide down the front slope and the rear slope of the bottom frame, the first bed board frame descends and is at the same height with the second bed board frame, and the rollers all slide down the slopes; through the design of the rollers and the slope, the first bed board frame, the second bed board frame and the bottom frame can be quickly stacked and unfolded, so that the sofa bed can be simply and quickly changed between the realization states.

Drawings

Fig. 1 is a schematic perspective view of the sofa bed according to the embodiment of the present invention when it is folded;

fig. 2 is a schematic perspective view of the bottom frame, the first bed board frame and the second bed board frame stacked in the embodiment of the present invention;

fig. 3 is a schematic perspective view of the second bed board frame after being stretched according to the embodiment of the present invention;

fig. 4 is a schematic perspective view of the first bed board frame and the second bed board frame of the present invention after being pulled out in a linkage manner in the embodiment of the present invention;

FIG. 5 is a schematic perspective view of the backrest module poured into the bottom frame according to the embodiment of the present invention;

fig. 6 is a schematic perspective view of a first bed board frame in an embodiment of the present invention;

fig. 7 is a schematic perspective view of the first bed board frame at another angle according to the embodiment of the present invention;

fig. 8 is a schematic perspective view illustrating a connection structure of a first bed board frame and a second bed board frame according to an embodiment of the present invention;

fig. 9 is a schematic perspective view of the connection between the first bed board frame and the bottom frame in the embodiment of the present invention;

fig. 10 is a schematic perspective view of a second bed board frame in an embodiment of the present invention;

fig. 11 is a schematic perspective view of the backrest module and the bottom frame according to the embodiment of the present invention;

fig. 12 is a schematic side perspective view of the backrest module and the bottom frame according to the embodiment of the present invention;

the figures are numbered: a backrest assembly 1; a bottom frame 2; a first bed board frame 3; a second bed board frame 4; a first guide 5; a first guide bar 6; a first guide tube 7; connecting vertical plates 7 a; a through hole 8; a connecting end 9; a guide bar connecting seat 10; a guide bar holder 11; a card slot 12; a guide tube connecting seat 13; a second guide 14; a second guide bar 15; a second guide tube 16; the first frame body 17; a front support frame 18; a rear support frame 19; a front rail 20; a side plate 21; a first frame front rail 22; a first frame rear cross bar 23; a first frame left longitudinal bar 24; a first frame right vertical bar 25; a front roller 26; a rear roller 27; a roller connecting seat 28; a front bottom rail 29; a rear bottom rail 30; a left bottom longitudinal bar 31; a right bottom longitudinal bar 32; a front slope 33; a rear ramp 34; a support bar 35; a second frame body 36; a front baffle 37; a front crossbar 38; a rear crossbar 39; a left longitudinal bar 40; a right longitudinal bar 41; the support side plates 42; an auxiliary support plate 43; a rotation connecting plate 44; a rotating shaft 45; a stopper pin 46; a limit groove 47; and a pulley arrangement 48.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-12, the present invention provides a stretching sofa bed structure, which comprises a backrest assembly 1, a bottom frame 2, a first bed board frame 3 and a second bed board frame 4.

As shown in fig. 2-9, a guiding device capable of stretching and sliding is respectively arranged between the first bed board frame 3 and the bottom frame 2 and between the first bed board frame 3 and the second bed board frame 4.

Specifically, as shown in fig. 2 to 8, a first guide device 5 is arranged between the first bed board frame 3 and the second bed board frame 2, the first guide device 5 includes a first guide rod 6 and a first guide tube 7, the first guide tube 7 is in sleeve fit with the first guide rod 6, and the first guide rod 6 is two cross rods arranged below the first bed board frame 2 in a bilateral symmetry manner; the first guide rod 6 is provided with a connecting end 9 with a through hole 8, the rear end of the first bed board frame 3 is provided with a guide rod connecting seat 10 which protrudes downwards, the outer contour of the guide rod connecting seat 9 is arc-shaped, the center of the guide rod connecting seat is provided with the through hole 8, and the bottom of the guide rod connecting seat 10 is fixed on the first bed board frame 3; when the installation is fixed, the connecting end 8 of the first guide rod 6 is fixedly connected with the guide rod connecting seat 9 through a screw, and the other end of the first guide rod 6 is clamped into a guide rod clamping seat 11; the guide rod clamping seat 11 is a flat plate vertically arranged at the front end of the first bed board frame 3, a clamping groove 12 is arranged on the guide rod clamping seat 11, and the guide rod 6 is clamped in the clamping groove 12; a connecting vertical plate 7a is arranged at the upper end of the first guide pipe 7, a through hole 8 is formed in the connecting vertical plate 7a, and a guide pipe connecting seat 13 protruding downwards is arranged at the corresponding position of the rear end of the second bed board frame 4; after the first guide pipe 7 is sleeved with the first guide rod 6, the connecting vertical plate 7a and the guide pipe connecting seat 13 are fixedly connected through screws; when the second bed board frame 4 is stretched to extend, the first guide pipe 7 slides on the first guide rod 6, after the second bed board frame 4 is completely extended, the first guide pipe 7 abuts against the guide rod clamping seat 11, and at the moment, the second bed board frame 4 and the first bed board frame 3 form linkage.

As shown in fig. 2 to 9, a second guiding device 14 is also arranged between the first bed board frame 3 and the bottom frame 2, the second guiding device 14 includes a second guiding rod 15 and a second guiding tube 16, the second guiding tube 16 is in sleeve fit with the second guiding rod 15, the second guiding rod 15 is two cross rods symmetrically arranged below the first bed board frame 2, and the second guiding rod 15 is fixed on the first bed board frame 3 in the same connection manner as the first guiding rod 6; after the second guide tube 16 is sleeved with the second guide rod 15, a guide tube connecting seat 13 protruding upwards is arranged at a corresponding position at the front end of the bottom frame 2; the second guide tube 16 is fixedly connected with the guide tube connecting seat 13 through screws; when the first deck frame 3 is extended, the second guide pipe 16 slides on the second guide bar 15. When the first bed board frame 3 is completely extended, the second guide tube 16 abuts against the guide rod connecting seat 10 to limit the first bed board frame 3 from being extended continuously.

As shown in fig. 6 and 7, the first bed board frame 3 includes a first frame body 17, a front support frame 18 and a rear support frame 19, the front support frame 18 includes a front cross bar 20, two ends of the front cross bar 20 are respectively connected with a side plate 21, the side plate 21 is an L-shaped plate, the top end of the side plate 21 is fixedly connected with the first frame body 17, and the guide bar clamping seats 11 are symmetrically arranged on the front cross bar 20. The first frame body 17 comprises first frame body front and rear cross bars 22 and 23 and first frame body left and right

vertical bars

24 and 25; a front roller 26 and a rear roller 27 are arranged on the left and right

vertical rods

24 and 25 of the first frame body; the front roller 26 is connected to the right lower side of the left and right

vertical bars

24, 25 of the first frame body through a roller connecting base 28, and the rear roller 27 is disposed on the side surface of the rear end of the left and right

vertical bars

24, 25 of the first frame body.

As shown in fig. 10-12, the bottom frame 2 includes front and rear bottom cross bars 29, 30, left and right bottom

vertical bars

31, 32, and support bars 35 at four corners; the guide pipe connecting seat 13 is arranged on a front bottom cross rod 29, a front slope 33 and a rear slope 34 which correspond to the front roller 26 and the rear roller 27 are arranged on the bottom frame, the rear slope 34 is a trapezoidal slope with slopes at the front and the rear, and the bottom end of the rear slope 34 is fixed right above the left and right bottom

longitudinal rods

31 and 32; the front end of the front slope 33 has a slope, the top surface is a horizontal plane, and in order to ensure that the position of the front slope 33 does not obstruct the drawing of the first bed board frame 3, the front slope 33 is fixedly connected with the inner sides of the left and right bottom

vertical rods

31 and 32.

As shown in fig. 2-12, when the sofa bed is in a collapsed state, the front roller 26 is located on the top surface of the front slope 33, the rear roller 27 is clamped on the slope surface of the rear end of the rear slope 34, and the rear roller 27 abuts against the support rod 35 at the rear end of the bottom frame 2, at this time, the first deck frame 3 is in a raised state and stacked right above the bottom frame 2, and the second deck frame 4 is stacked between the first deck frame 3 and the bottom frame 2 along the vertical direction; when the sofa bed is in a stretching state, the second bed board frame 4 stretches out to drive the first bed board frame 3 to enable the front roller 26 and the rear roller 27 to slide down from the front slope 33 and the rear slope 34 on the bottom frame 2, at the moment, the first bed board frame 3 descends and is at the same height with the second bed board frame 4, and the rear roller 27 falls on the left bottom vertical rod 31 and the right bottom vertical rod 32; when the stretching is continued, the rear rollers 27 on the first bed board frame 3 roll along the left and right bottom longitudinal rods 31 and 32; when the sofa bed needs to be reset, the second bed board frame 4 is pushed to roll the front roller 26 and the rear roller 27 back to the front slope 33 and the rear slope 34.

As shown in fig. 10, the second bed board frame 4 includes a second frame body 36 and a front baffle 37, the second frame body 36 is of a "square" structure, and includes front and rear

opposite crosspieces

38, 39 and left and right spaced vertical baffle bars 40, 41, the left and right vertical baffle bars 40, 41 are connected with a support side plate 42 extending downward, when the sofa bed is folded, the support side plate 42 abuts against the front cross bar on the first bed board frame 3; the auxiliary supporting plate 43 is positioned below the front transverse baffle plate 38 and the rear transverse baffle plate 39 and protrudes backwards from the rear transverse baffle plate, and the auxiliary supporting plate 43 is positioned in the middle of the second frame body 36 and extends forwards to be connected and fixed with the front baffle plate 37; after the sofa bed stretches to enable the first bed board frame 3 to fall down, the first frame front cross rod 22 on the first frame body 17 falls on the auxiliary supporting plate 43, and the auxiliary supporting plate 43 plays a role in supporting the first bed board frame 3, so that the overall structure is more stable.

As shown in fig. 5, 11 and 12, the backrest module 1 is rotatably engaged with the bottom frame 2 through a rotating connecting plate 44, the rotating connecting plate 44 is rectangular, the side surface of the rotating connecting plate 44 is fixedly connected to the supporting rod 35 at the rear end of the bottom frame 2, and the backrest module 1 is rotatably engaged with the rotating connecting plate 44 through a rotating shaft 45. A limiting mechanism is further arranged between the rotating connecting plate 44 and the backrest component 1, the limiting mechanism comprises a limiting pin 46 and an arc-shaped limiting groove 47 arranged on the rotating connecting plate 44, and after the limiting pin 46 is matched with the limiting groove 47, the limiting pin 46 is connected and fixed on the backrest component 1. The limiting groove 47 can limit the backrest assembly to turn over between 0 and 90 degrees; when the first bed board frame 3 is completely extended outwards, the backrest assembly 1 is turned around the rotating connecting plate 44 and poured into the bottom frame 2, and a horizontal bed surface is formed among the backrest assembly 1, the first frame body 17 and the second frame body 36.

As shown in fig. 12, the first bed plate frame 3 and the second bed plate frame 4 are both provided with a pulley device 48 capable of sliding along the ground, the pulley device 48 is of a conventional design, and the pulley device 48 can play a supporting role when the first bed plate frame 3 and the second bed plate frame 4 are stretched.

Claims

1. The utility model provides a tensile formula sofa bed structure which characterized in that: the backrest assembly is arranged at one end of the bottom frame and is in rotating fit with the bottom frame, and guiding devices which can stretch and slide are arranged between the first bed board frame and the bottom frame and between the first bed board frame and the second bed board frame; the first bed board frame is provided with a front roller and a rear roller, and the bottom frame is correspondingly provided with a front slope and a rear slope; in a furled state, the front idler wheel and the rear idler wheel of the first bed board frame are positioned on the front slope and the rear slope of the bottom frame, the first bed board frame is in a raised state and is stacked right above the bottom frame, and the second bed board frame is stacked between the first bed board frame and the bottom frame along the vertical direction; when the bed board frame is in a stretching state, the second bed board frame extends outwards completely and then is linked with the first bed board frame, so that the front roller and the rear roller on the first bed board frame slide down the front slope and the rear slope of the bottom frame, and the first bed board frame descends and is at the same height as the second bed board frame; and when the first bed board frame extends outwards completely, the backrest assembly is overturned around the bottom frame and poured into the bottom frame.

2. The stretch sofa bed structure according to claim 1, wherein: first bed board frame and second bed board frame between be equipped with first guider, first guider include first guide bar and first stand pipe, first stand pipe and first guide bar cup joint the cooperation, first guide bar set up on one of them of first bed board frame or second bed board frame, first stand pipe then sets up on another in second bed board frame or first bed board frame.

3. The stretch sofa bed structure according to claim 2, wherein: the first guide rod is arranged at the lower end of the first bed board frame, the connecting end of the first guide rod is fixed below the rear portion of the first bed board frame through a guide rod connecting seat, the other end of the first guide rod is clamped into a guide rod clamping seat, the guide rod clamping seat is arranged at the front end of the first bed board frame, and the first guide pipe is connected and fixed on the second bed board frame through a guide pipe connecting seat.

4. The stretch sofa bed structure according to claim 1, wherein: first bed board frame and bottom frame between be equipped with second guider, second guider include second guide bar and second stand pipe, second stand pipe and second guide bar cup joint the cooperation, the second guide bar set up on one of them of first bed board frame or bottom frame, the second stand pipe then sets up on another of bottom frame or first bed board frame.

5. The tension sofa bed structure as claimed in claim 4, wherein: the second guide rod is arranged at the lower end of the first bed board frame, the connecting end of the second guide rod is fixed at the rear lower part of the first bed board frame through a guide rod connecting seat, the other end of the second guide rod is clamped into a guide rod clamping seat, and the second guide pipe is connected and fixed on the bottom frame through a guide pipe connecting seat.

6. The tension sofa bed structure as in claim 5, wherein: the first bed board frame comprises a first frame body, a front supporting framework and a rear supporting framework, the front supporting framework comprises a front cross rod, two ends of the front cross rod are respectively connected with a side plate, the top end of the side plate is fixedly connected with the first frame body, and the guide rod clamping seats are arranged on the front cross rod in a bilateral symmetry mode.

7. The tension sofa bed structure as in claim 6, wherein: the first frame body comprises a front cross rod and a rear cross rod of the first frame body, and a left vertical rod and a right vertical rod of the first frame body; the front rollers are arranged right below the left and right vertical rods of the first frame body, and the rear rollers are arranged at two ends of the left and right vertical rods of the first frame body; the front roller is positioned on the front slope, and the rear roller is positioned on the rear slope.

8. The stretch sofa bed structure according to claim 7, wherein: the bottom frame comprises a front bottom cross rod, a rear bottom cross rod, a left bottom longitudinal rod and a right bottom longitudinal rod, the rear slope is a trapezoidal slope with slopes at the front and the rear, and the bottom end of the rear slope is fixed right above the left bottom longitudinal rod and the right bottom longitudinal rod; the position of the front slope is configured not to obstruct the drawing of the first bed board frame.

9. The stretch sofa bed structure according to claim 8, wherein: the front slope is connected and fixed on the inner sides of the left and right bottom longitudinal rods.

10. The stretch sofa bed structure according to claim 1, wherein: the second bed board frame include the second frame body and preceding baffle, the second frame body be "mouth" style of calligraphy structure, including relative crosspiece pole around with control the spaced vertical pin, the vertical pin at left and right both ends is connected with downwardly extending's support curb plate.

11. The stretch sofa bed structure according to claim 10, wherein: the auxiliary supporting plate is positioned below the transverse baffle and protrudes backwards from the rear transverse baffle.

12. The stretch sofa bed structure according to claim 11, wherein: the auxiliary supporting plate is positioned in the middle of the second frame body and extends forwards to be connected with the front baffle.

13. The stretch sofa bed structure according to claim 1, wherein: the backrest assembly is in running fit with the bottom frame through a rotating connecting plate, the rotating connecting plate is connected and fixed at the rear end of the bottom frame, and the backrest assembly is in running fit with the rotating connecting plate through a rotating shaft.

14. The stretch sofa bed structure according to claim 13, wherein: the rotary connecting plate and the backrest component are provided with a limiting mechanism, the limiting mechanism comprises a limiting pin and an arc-shaped limiting groove arranged on the rotary connecting plate, and the limiting pin is connected and fixed on the backrest component after being matched with the limiting groove.

15. The stretch sofa bed structure according to claim 1, wherein: and the first bed board frame and the second bed board frame are both provided with pulley devices capable of sliding along the ground.