Pull-Out Mechanism for Sofa Bed Frame and Sofa Bed Thereof

Abstract

The present invention relates to a pull-out mechanism for a sofa bed frame and a sofa bed thereof. The pull-out mechanism has a relatively simple connection mechanism, and the pull-out mechanisms can pull out the sofa bed. The pull-out mechanisms do not contact with each other, but they abut against each other to form a sliding surface guiding direction when guidance is needed, and guide the sofa bed to an unfolded use state. At the same time, even if the pull-out mechanism rusts, the function of the pull-out mechanism will not be greatly affected, and the sofa bed can be clearly disassembled and used separately. For example, the main bed body may continue to maintain the basic functions of the sofa, while the auxiliary bed body can be used a foot rest or a sofa stool.

Claims

1. A pull-out mechanism for a sofa bed frame, comprising a main frame, a sub-frame capable of moving in and out of the main frame on the ground, a structure of a track and a slider for limiting the left-right deviation of the sub-frame, and a blocking part for preventing the sub-frame from completely moving out of the main frame; and the track is fixed to the main frame or the sub-frame and is configured to extend from a rear end to a front end of the main frame or the sub-frame, and comprises a rod; and the slider is fixed to the sub-frame or the main frame corresponding to the track, and comprises a slot with an opening, and the slot is suitable for receiving the rod; and the blocking part is fixed to an end of the track and configured to block the slider from moving; and wherein, when the sub-frame moves back and forth, the rod is received by the slot, and the slider is not in contact with the rod; and when the sub-frame deviates left and right, the slider restricts the rod in the slot.

2. The pull-out mechanism for a sofa bed frame according to claim 1, wherein, the slot comprises two slot surfaces which are oppositely arranged, and a bottom surface which connects the two slot surfaces; and when the sub-frame moves back and forth, the rod is received by the slot, and an outer surface of the rod has gaps with the slot surfaces and the bottom surface.

3. The pull-out mechanism for a sofa bed frame according to claim 1, wherein, the track comprises a rod fixed to the main frame, and the rod extends from the rear end to the front end of the main frame; the slider is fixed to the sub-frame, the slider is provided with a slot through which the rod can pass, and the slider is provided with an opening communicating with the slot for putting the rod; and an outer end of the rod is bent and molded in a direction away from the sub-frame to form a crossbar, and the crossbar constitutes the blocking part.

4. The pull-out mechanism for a sofa bed frame according to claim 3, wherein, the rods are configured to be left and right, the sub-frame is placed between the left and right rods, and the sliders are correspondingly arranged on two sides of the sub-frame.

5. The pull-out mechanism for a sofa bed frame according to claim 3, wherein an outer end of the crossbar is provided with a mounting seat, and the track is attached to the main frame through the mounting seat.

6. The pull-out mechanism for a sofa bed frame according to claim 3, further comprising a limiting rod for opening or closing the opening, the limiting rod is arranged on the sub-frame or the slider, and when the sub-frame is lifted upwards, the limiting rod closes the opening and limits the track in the slot.

7. The pull-out mechanism for a sofa bed frame according to claim 6, wherein the limiting rod is L-shaped, a short side of the L-shaped limiting rod is rotatably connected with the sub-frame or the slider, and the opening is closed when a long side of the L-shaped limiting rod rotates above the opening.

8. The pull-out mechanism for a sofa bed frame according to claim 1, wherein, the track comprises a rod fixed to the sub-frame, and the rod extends from a rear end to a front end of the sub-frame; the slider is fixed to the main frame, the slider is provided with a slot through which the rod can pass, and the slider is provided with an opening communicating with the slot for putting the rod; and an outer end of the rod is bent and molded in a direction away from the main frame to form a crossbar, and the crossbar forms the blocking part.

9. The pull-out mechanism for a sofa bed frame according to claim 8, wherein two sliders are arranged on the right and left sides of the main frame, two rods are arranged correspondingly on the right and left sides, and the rods are arranged between the two sliders on the right and left sides.

10. The pull-out mechanism for a sofa bed frame according to claim 9, wherein the crossbar extends from the rod and is connected to another rod to form the sub-frame, and the sub-frame is placed between the left and right rods.

11. The pull-out mechanism for a sofa bed frame according to claim 8, further comprising a limiting rod for opening or closing the opening, the limiting rod is arranged on the main frame or the slider, and when the sub-frame is lifted upwards, the limiting rod closes the opening and limits the track in the slot.

12. The pull-out mechanism for a sofa bed frame according to claim 11, wherein the limiting rod is L-shaped, the short side of the L-shaped limiting rod is rotatably connected with the main frame or the slider, and the opening is closed when the long side of the L-shaped limiting rod rotates above the opening.

13. The pull-out mechanism for a sofa bed frame according to claim 1, wherein a bottom of the sub-frame is provided with pulleys, and the number of the pulleys is four, which are respectively arranged at the four corners of the bottom of the sub-frame.

14. A pull-out mechanism for a sofa bed frame, comprising a main frame, a sub-frame capable of moving in and out of the main frame on the ground, a structure of a track and a slider for limiting the left-right deviation of the sub-frame, and a blocking part for preventing the sub-frame from completely moving out of the main frame; and the track is fixed to the main frame or the sub-frame and is configured to extend from a rear end to a front end of the main frame or the sub-frame, and comprises a rod; and the slider is fixed to the sub-frame or the main frame corresponding to the track, and comprises a slot with an opening, and a limiting rod for opening or closing the opening; and the rod is suitable for being received by the slot; and the blocking part is fixed to an end of the track and configured to block the slider from moving; and when the sub-frame moves back and forth, the rod is received by the slot, and the slider is not in contact with the rod; when the sub-frame deviates left and right, the slider restricts the rod in the slot, and when the sub-frame is lifted upwards, the limiting rod closes the opening and restricts the track in the slot.

15. The pull-out mechanism for a sofa bed frame according to claim 14, wherein the slot comprises two opposite slot surfaces and a bottom surface connecting the two slot surfaces, when the sub-frame moves back and forth, the rod is received by the slot, and an outer surface of the rod has gaps with the slot surfaces and the bottom surface.

16. The pull-out mechanism for a sofa bed frame according to claim 14, wherein, the track comprises a rod fixed to the main frame, and the rod extends from the rear end to the front end of the main frame; the slider is fixed to the sub-frame, the slider is provided with a slot through which the rod can pass, and the slider is provided with an opening communicating with the slot for putting the rod; and an outer end of the rod is bent and molded in the direction away from the sub-frame to form a pull-out mechanism for a sofa bed frame, and the crossbar forms the blocking part.

17. The pull-out mechanism for a sofa bed frame according to claim 15, wherein the limiting rod is L-shaped, a short side of the L-shaped limiting rod is rotatably connected with the sub-frame or the slider, and the opening is closed when a long side of the L-shaped limiting rod rotates above the opening.

18. The pull-out mechanism for a sofa bed frame according to claim 14, wherein a bottom of the sub-frame is provided with pulleys, and the number of the pulleys is four, which are respectively arranged at the four corners of the bottom of the sub-frame.

19. A sofa bed, comprising a main bed body, an auxiliary bed body capable of moving in and out of the main bed body on the ground, a structure of a track and a slider for limiting the left-right deviation of the auxiliary bed body, and a blocking part for preventing the auxiliary bed body from completely moving out of the main bed body; wherein, the track is fixed to the main bed body or the auxiliary bed body and is configured to extend from a rear end to a front end of the main bed body or the auxiliary bed body, and comprises a rod; and the slider is fixed to the auxiliary bed body or the main bed body corresponding to the track, and comprises a slot with an opening, and the rod is suitable for being received by the slot; and the blocking part is fixed to an end of the track and configured to block the slider from moving; and wherein, when the auxiliary bed body moves back and forth, the rod is received by the slot, and the slider is not in contact with the rod, and when the auxiliary bed body deviates left and right, the slider restricts the rod in the slot.

20. The sofa bed according to claim 19, further comprising a limiting rod for opening or closing the opening, the limiting rod is arranged on the auxiliary bed body or the slider, and when the auxiliary frame is lifted upwards, the limiting rod closes the opening and limits the track in the slot.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to explain the technical solution of this application more clearly, the drawings needed in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementations of this application. For those skilled in the art, other drawings can be obtained according to these drawings without creative work.

[0022] FIG. 1 is a structural schematic diagram of a pull-out mechanism for a sofa bed frame;

[0023] FIG. 2 is a partial structural schematic diagram of the pull-out mechanism for a sofa bed frame;

[0024] FIG. 3 is a partial structural schematic diagram of the pull-out mechanism for a sofa bed frame;

[0025] FIG. 4 is a partial structural schematic diagram of the sofa bed frame pull-out mechanism;

[0026] FIG. 5 is a schematic diagram of a sofa bed frame pull-out mechanism according to another embodiment of the present invention;

[0027] FIG. 6 is a schematic diagram of the bottom frame of the sofa bed frame pull-out mechanism according to another embodiment of the present invention;

[0028] FIG. 7 is a schematic diagram of a slider;

[0029] FIG. 8 is another schematic view of the slider;

[0030] FIG. 9 is another schematic view of the slider;

[0031] FIG. 10 is another schematic view of the slider;

[0032] FIG. 11 is another schematic view of the slider;

[0033] FIG. 12 is a schematic view of the slot surface and the rod surface.

[0034] In the figures

[0035] Main frame (1000); Sub-frame (2000); Rod (3000); Slider (4000); A limiting rod (5000); Crossbar (6000); Pulley (2001); Track (3001); Blocking part (3002); Rod side surface (3003); Rod top surface (3004); Slot (4001); Mounting seat (4002); Slot surface (4003); Bottom surface (4004).

DESCRIPTION OF EMBODIMENTS

[0036] In the following, the technical solution in the embodiment of the application will be clearly and completely described with reference to the drawings in the embodiment of the application. Obviously, the described embodiment is only a part of the embodiment of the application, but not the whole embodiment. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of this application.

[0037] Reference to an example or an embodiment herein means that a particular feature, structure or characteristic described in connection with an embodiment or an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In this specification, for the sake of convenience, words and expressions indicating orientation or positional relationship such as middle, upper, lower, front, rear, vertical, horizontal, top, inner and outer are used to illustrate the positional relationship of constituent elements with reference to the attached drawings, only for the convenience of description. The positional relationship of the constituent elements is appropriately changed according to the direction of the described constituent elements. Therefore, it is not limited to the words and expressions described in the specification, and can be replaced appropriately according to the situation.

[0039] As shown in FIGS. 1 to 6, the present invention provides a pull-out mechanism for a sofa bed frame, which includes a main frame 1000, a sub-frame 2000 that can move in and out of the main frame 1000 on the ground, A structure of a track 3001 and a slider 4000 that limit the left-right deviation of the sub-frame 2000, and a blocking part 3002 that prevents the sub-frame 2000 from completely moving out of the main frame; and [0040] the track 3001 is fixed to the main frame 1000 or the sub-frame 2000 and is configured to extend from the rear end to the front end of the main frame 1000 or the sub-frame 2000, and includes a rod 3000; and [0041] the slider 4000 is fixed to the sub-frame 2000 or the main frame 1000 corresponding to the track 3001, and includes a slot 4001 with an opening, and the rod 3000 is suitable to be received by the slot 4001; and [0042] the blocking part 3002 is fixed to the end of the track 3001 and configured to block the slider 40000 from moving; and [0043] as shown in FIGS. 3 and 5, when the sub-frame 2000 moves back and forth, the rod 3000 is received by the slot 40001, and the slider 4000 is not in contact with the rod 3000; when the sub-frame 2000 deviates left and right, the slider 4000 restricts the rod 3000 in the slot 4001, and the bottom of the sub-frame 2000 is provided with pulleys 2001, and the number of the pulleys 2001 is four and they are respectively arranged at that four corners of the bottom of the sub-frame 2000.

[0044] As shown in FIGS. 8 and 12, the slot 4001 includes two opposite slot surfaces 4003 and a bottom surface 4004 connecting the two slot surfaces 4003. The rod 3000 also includes a rod side surface 3003 corresponding to the slot surface 4003 and a rod top surface 3004 corresponding to the bottom surface. When the sub-frame 2000 moves back and forth, the rod 3000 is received by the slot 4001, and the outer surface of the rod 3000 has a gap with both the slot surface 4003 and the bottom surface 4004. Specifically, there is a gap between the slot surface 4003 and the rod side surface 3003, and a gap between the bottom surface 4004 and the rod top surface 3004. When the U-shaped through slot of the slot 4001 is provided in the slider 4000, the rod 3000 is placed in the slot 4001 through the U-shaped opening; the extension direction of the rod 3000 is defined as longitudinal, the cross section of the slider 4000 is U-shaped, and the lateral width of the rod 3000 is smaller than that of the slot 4001. The gap between the rod 3000 and the slider 4000 in the left and right direction is formed. The slider 4000 and the rod 3000 are designed with different heights to form a height difference, which is also the depth of the rod 3000 placed in the slot 4001, and forms the gap between the rod 3000 and the slider 4000 in the up and down direction.

[0045] As shown in FIG. 1 to FIG. 4, in one embodiment, the track includes a rod 3000 fixed to the main frame 1000, and the rod 3000 extends from the rear end to the front end of the main frame 1000; a slider 4000 fixed to the sub-frame 2000, and the slider 4000 is provided with a slot 4001 through which the rod 3000 can pass, and the slider 4000 is provided with an opening communicating with the slot 4001 to put the rod 3000. An outer end of the rod 3000 is bent and molded in the direction away from the sub-frame 2000 to form a crossbar 6000, and the crossbar 6000 forms a blocking part. An outer end of the crossbar 6000 is provided with a mounting seat 4002, and the track is attached to the main frame 1000 through the mounting seat 4002.

[0046] The rods 3000 are arranged in two left and right positions, the sub-frame 2000 is arranged between the two left and right rods 3000, and the sliders 4000 are correspondingly arranged on the two sides of the sub-frame 2000. The rod 3000 can be regarded as an elongated track arranged in parallel with the ground, and the slider 4000 is sleeved outside the elongated track. When a single elongated track is provided, this sleeve can be designed to cover at least the left and right sides of the elongated track. When the elongated tracks are arranged on the two sides, this sleeve can be designed to cover at least one side of the elongated track for restriction, but as in this embodiment, in order to cooperate with the crossbar 6000, one of the sliders 4000 still needs to cover the two sides of the elongated track, that is, one of the sliders 4000 still needs to cover the corresponding surface of the elongated track bent into the crossbar 6000, the inner side of the slider 4000 limits the left-right deviation, and the end face of the slider 4000 abuts against the crossbar 6000 to restrict the forward movement; [0047] the elongated track can be a part of the frame structure of the main frame 1000, or it can be an independent component mounted on the main frame 1000 through the mounting seat 4002, and the slider 4000 is arranged on the sub-frame 2000 corresponding to the elongated track.

[0048] The pull-out mechanism for a sofa bed frame also includes a limiting rod 5000 for opening or closing the opening. The limiting rod 5000 is arranged on the sub-frame 2000 or the slider 4000. When the sub-frame 2000 is lifted upwards, the limiting rod 5000 closes the opening and limits the track in the slot 4001. The limiting rod 5000 is L-shaped, the short side of the limiting rod 5000L is rotatably connected with the sub-frame 2000 or the slider 4000, and the opening is closed when the long side of the limiting rod 5000L is rotated above the opening. In some embodiments (not shown in the figure), the limiting rod 5000 can not only open and close the opening in a rotating way, but also open and close the opening in a telescopic way, or open and close the opening elastically by setting an elastic member.

[0049] As shown in FIG. 5 and FIG. 6, in another embodiment, the track includes a rod 3000 fixed to the sub-frame 2000, the rod 3000 extends from the rear end to the front end of the sub-frame 2000, and a slider 4000 fixed to the main frame 1000. The slider 4000 is provided with a slot 4001 through which the rod 3000 can pass, and the slider 4000 is provided with an opening communicating with the slot 4001 to put the rod 3000. The outer end of the rod 3000 is bent in the direction away from the main frame 1000 to form a crossbar 6000, and the crossbar 6000 constitutes a blocking part.

[0050] Two sliders 4000 are arranged on the main frame 1000, and two rods 3000 are arranged correspondingly, and the rods 3000 are placed between the two sliders 4000. The crossbar 6000 extends from the rod and is connected to another rod 3000 to form the sub-frame 2000, and the sub-frame 2000 is placed between the left and right rods 3000.

[0051] The rod 3000 can be regarded as an elongated track arranged parallel to the ground, and the slider 4000 is sleeved outside the elongated track. When the elongated track is single, this sleeve can be designed to cover at least the left and right sides of the elongated track, and when the elongated track is arranged on both sides, this sleeve can be designed to cover at least one side of the elongated track for restriction. However, as in this embodiment, in order to cooperate with the crossbar 6000, One of the sliders still needs to cover both sides of the elongated track, that is, one of the sliders 4000 still needs to cover the corresponding surface of the elongated track bent into the crossbar 6000, the inner side of the slider 4000 restricts the left-right deviation, and the end surface of the slider 4000 abuts against the crossbar 6000 to restrict the forward movement.

[0052] The elongated track can be a part of the frame structure of the sub-frame 2000, or it can be an independent component installed on the sub-frame 2000 through the mounting seat 4002. The slider 4000 is arranged on the main frame 1000 corresponding to the elongated track, and a plurality of structural rods are connected between the elongated tracks to form the sub-frame 2000. Any two adjacent structural rods are selected, and the area between the two structural rods is the range where the slider 4000 can move back and forth. Usually, only two structural rods are designed, of which the last one moved out of the main frame is taken as the crossbar 6000.

[0053] The pull-out mechanism for a sofa bed frame further includes a limiting rod 5000 for opening or closing the opening, and the limiting rod 5000 is arranged on the main frame 1000 or the slider 4000. When the sub-frame 2000 is lifted upwards, the limiting rod 5000 closes the opening and limits the track in the slot 4001. The limiting rod 5000 is L-shaped, the short side of the limiting rod 5000L is rotatably connected with the main frame 1000 or the slider, and the opening is closed when the long side of the limiting rod 5000L is rotated above the opening. The limiting rod 5000 can not only open and close the opening in a rotating way, but also open and close the opening in a telescopic way, or open and close the opening elastically by arranging an elastic member. In some embodiments (not shown in the figure), the limiting rod 5000 can not only open and close the opening in a rotating way, but also open and close the opening in a telescopic way, or open and close the opening elastically by setting an elastic member.

[0054] For the above two embodiments, the slot 4001 is a through slot that runs through the end face of the slider 4000, and its cross section is specifically a bottom surface and two opposite side surfaces, the two opposite side surfaces extending from the two sides of the bottom surface. When the rod 3000 is placed in the slot 4001, the two side surfaces cover both sides of the rod 3000. In some embodiments, the two side surfaces are perpendicular to the bottom surface, and there is a gap between the rod 3000 and the two side surfaces and the bottom surface. The distance between the two sides can accommodate the rod 3000 with a certain margin to form a gap between the rod 3000 and the two sides, and the gap between the rod 5000 and the bottom surface can be formed by controlling the depth of the rod 5000 placed in the slot from the opening.

[0055] In some embodiments, as shown in FIG. 8, a U-shaped slot 4001 is provided on the slider 4000, and the rod 3000 is placed in the slot 4001 from the U-shaped opening; the extension direction of the rod 3000 is defined as the longitudinal direction, and the cross section of the slider 4000 is U-shaped, and the transverse width of the rod 3000 is smaller than that of the slot 4001, thus forming a gap between the rod 3000 and the slider 4000 in the left-right direction. The slider 4000 and the rod 3000 are designed with different heights, and the height difference between the slider 4000 and the rod 3000 forms a gap between the rod 3000 and the slider 4000 in the vertical direction.

[0056] By controlling the height of the slider 4000, a gap is formed between the top or bottom surface of the rod 3000 (depending on the slot opening direction of the slider) and the slot 4001, so that when the sub-frame 2000 moves back and forth, and there is a gap between the slider 4000 and the rod 3000, the route of the sub-frame 2000 entering and leaving the main frame 1000 in a state that the slider 4000 and the rod 3000 are not in contact is defined as an in-and-out trajectory. When the sub-frame 2000 deviates left and right and deviates from the in-and-out trajectory, the slider 4000 moves with the sub-frame 2000, and the gap between the inner wall of the slot 4001 in the slider 4000 and the rod 3000 decreases with the increase of the deviation amplitude, until a sliding surface is formed by abutment, and the slider 4000 ends at this sliding surface and also restricts the rod 3000 in the slot, limiting the left and right movement of the sub-frame 2000, while keeping the restriction for the movement of the sub-frame 2000 in one of the left and right directions, and this continuous abutting sliding has the effect of guiding the movement and guiding the sub-frame 2000 to switch to the use state of expanding or retracting of the sofa bed.

[0057] The length of the slider 4000 is not limited, and its length can be shortened and designed to be similar to a slider in this embodiment, or it can be designed to be similar to a slide track in some embodiments by increasing its length. In some embodiments, as shown in FIG. 7, the slider 4000 is provided with a slot which can accommodate the elongated track, and the slot runs through the front and rear end faces of the slider 4000. The slot opening is opened on the side wall of the slider 4000, and the elongated track is put into the slot of the slider 4000 through the opening. As the sub-frame 2000 moves, the slider 4000 moves relative to the main frame 1000 or the sub-frame 2000, and the elongated track continuously passes through the slider 4000 through the slot. The contour of the inner wall of the slot can be set according to the contour of the outer wall of the elongated track, so that the bonding surface is wider and the guiding effect is better when bonding. This slot is designed to be larger than the cross section of the elongated track, so that the slider 4000 is sleeved on the periphery of the elongated track and the elongated track is placed in the slot. A gap can be left between the slider 4000 and the side surface of the elongated track. In some embodiments, as shown in FIGS. 9 and 10, the shape of the contour of the inner wall of the slot can be designed such that the side edge of the slot is inclinedly extended, and a concave part may also be arranged on the inner wall of the slot. As shown in FIG. 10 and FIG. 11, the outer contour of the elongated track and the corresponding part of the slot can also be set obliquely, or can also be provided with a convex part, as shown in FIG. 11, the inner contour of the slot can also be set independently of the outer contour of the elongated track.

[0058] In some embodiments (not shown in the figure), the inner surface of the slider 4000 can also be provided with a lubricating layer, which is convenient to reduce the friction on the sliding surface when the slider 4000 abuts against the elongated track to form the sliding surface;

[0059] The sub-frame 2000 and the main frame 1000 prevent the sub-frame 2000 from completely moving out and separating through the crossbar 6000, and at the same time, the sub-frame 2000 can be converted from the use state of folding and retracting to another use state of unfolding and extending through the limit. No matter whether the slider 4000 is arranged in the sub-frame 2000 or the main frame 1000, the sub-frame 2000 is usually more convenient to lift than the main frame 1000, and the opening of the slot 4001 on the slider 4000 can be designed to open downwards or upwards.

[0060] However, in order to facilitate the separation of the main frame and the sub-frame, as shown in FIGS. 3 to 5, when the elongated track is set on the main frame 1000 and the slider 4000 is set on the sub-frame 2000, the slot 4001 on the slider 4000 is usually designed to open downwards, which is convenient for lifting and separating the sub-frame 2000, and the limiting rod 5000 is correspondingly arranged on the sub-frame 2000 or the slider 4000; when the elongated track is arranged on the sub-frame 2000 and the slider 4000 is arranged on the main frame 1000, the 4001 slot on the slider 4000 is usually designed to open upwards, which is convenient for lifting and separating the sub-frame 2000, and the limiting rod 5000 is correspondingly arranged on the main frame 1000 or the slider 4000; when the separation of the main frame 1000 and the sub-frame 2000 is unnecessary or prevented, the limiting rod 5000 is rotated to closes the opening and limit the track in the slot 4001 to prevent the separation of the main frame 1000 and the sub-frame 2000 after the sub-frame 2000 is lifted or tilted; when the main frame 1000 and the sub-frame 2000 are separated, it is necessary to rotate the limiting rod 5000 to open the opening of the slot before lifting the sub-frame 2000, and the rod 3000 is separated from the slot 4001, and the main frame 1000 and the sub-frame 2000 are used separately.

[0061] In some embodiments (not shown in the figure), the slider 4000 can also be provided with positioning holes, and a plurality of extendable and retractable positioning posts are arranged along the length of the elongated track; the positioning posts are used in cooperation with the positioning holes, and the positioning posts are clamped into the positioning holes to prevent the sub-frame from moving. When using the sofa bed, each positioning post respectively determines the length of one sub-frame, so that the sofa bed has a plurality of protruding states, which optimizes the user experience, and in order to further facilitate positioning and unlocking, the positioning post is provided with elastic members to realize elastic expansion and contraction, and can automatically pop up and clamp when it is in place. The positioning post is provided with a stressed inclined plane, and the inner wall of the positioning hole presses the stressed inclined plane to guide the positioning post to retract against the elastic force, so that the user can switch between a plurality of extended states only by appropriately pushing and pulling the sub-frame 2000.

[0062] The present invention further provides a sofa bed, which includes a main bed body, an auxiliary bed body which can move in and out of the main bed body on the ground, a structure of a track and a slider for limiting the left-right deviation of the auxiliary bed body, and a blocking part for preventing the auxiliary bed body from moving out of the main bed body; and [0063] the track is fixed to the main bed body or the auxiliary bed body and is configured to extend from the rear end to the front end of the main bed body or the auxiliary bed body, and includes a rod 3000; and [0064] the slider 4000 is fixed to the auxiliary bed body or the main bed body corresponding to the track, and includes a slot 4001 with an opening, and the rod 3000 is suitable to be received by the slot 4001; and [0065] the blocking part is fixed to the track end and configured to block the slider 4000 from moving; and [0066] wherein, when the sub-frame 2000 moves back and forth, the rod 3000 is received by the slot 4001, and the slider 4000 is not in contact with the rod 3000; when the sub-frame 2000 deviates left and right, the slider 4000 restricts the rod 3000 in the slot 4001; [0067] the slot 4001 includes two opposite slot surfaces 4003 and a bottom surface 4004 connecting the two slot surfaces 4003; the rod 3000 also includes a rod side surface 3003 corresponding to the slot surface 4003 and a rod top surface 3004 corresponding to the bottom surface; when the sub-frame 2000 moves back and forth, the rod 3000 is received by the slot 4001, and the outer surface of the rod 3000 has a gap with both the slot surface 4003 and the bottom surface 4004; specifically, a gap is left between the slot surface 4003 and the rod side surface 3003, and a gap is left between the bottom surface 4004 and the rod top surface 3004.

[0068] The slot 4001 is a through slot that runs through the end face of the slider 4000, and its cross section is specifically a bottom face and two opposite side faces, the two opposite side face extending from the two sides of the bottom face. When the rod 3000 is placed in the slot 4001, the two side faces cover both sides of the rod 3000. In some embodiments, the two side faces are perpendicular to the bottom face, and there is a gap between the rod 3000 and the two side faces and the bottom face. The distance between the two sides can accommodate the rod 3000 with a certain margin to form a gap between the rod 3000 and the two sides, and the gap between the rod 3000 and the bottom surface can be formed by controlling the depth of the rod 3000 placed in the slot 4001 from the opening.

[0069] The mechanism also includes a limiting rod 5000 for opening or closing the opening, and the limiting rod 5000 is arranged on the auxiliary bed body or the slider 4000. When the auxiliary bed body is lifted upwards, the limiting rod 5000 closes the opening and limits the track in the slot 4001. The limiting rod 5000 can not only open and close the opening in a rotating way, but also open and close the opening in a telescopic way, or open and close the opening elastically by arranging an elastic member. The numb of pulleys is four, and that pulley are respectively arranged at the four corners of the bottom of the auxiliary bed body.

[0070] The slot 4001 is a U-shaped through slot provided on the slider 4000, and the rod 3000 is placed in the slot 4001 from the U-shaped opening; the extension direction of the rod 3000 is defined as longitudinal, the cross section of the slider 4000 is U-shaped, and the transverse width of the rod 3000 is smaller than the transverse width of the slot, which forms a gap between the rod 3000 and the slider 4000 in the left and right direction. The slider 400 and the rod 3000 are designed with different heights. The height difference between the slider 4000 and the rod 3000 forms a gap between the rod 3000 and the slider 4000 in the vertical direction, and the gap between the top or bottom surface of the rod 3000 (depending on the opening direction of the slot 4001 of the slider 4000) and the slot 4001 is formed by controlling the height of the slider 4000, so that a gap is left between the slider 4000 and the rod 3000 especially in the horizontal direction when the auxiliary bed body moves back and forth. The route of the auxiliary bed body going in and out of the main bed body is defined as an in-and-out trajectory in a state of keeping the slider 4000 and the rod 3000 are not in contact with a gap; when the auxiliary bed body moves and deviates left and right from the in-and-out trajectory, the slider 4000 moves with the auxiliary bed body, and the gap between the inner wall of the slot 4001 in the slider 4000 and the rod decreases with the increase of the deviation, until a sliding surface its formed from abutment, and the slider 4000 ends on the sliding surface and also restricts the rod 3000 in the slot 4001, and restrict the movement of the auxiliary bed in the left-right direction. When the separation of the main bed body and the auxiliary bed body is unnecessary or prevented, the limiting rod 5000 is rotated to close the opening and limit the track in the slot 4001 to prevent the separation of the main bed body and the auxiliary bed body after the auxiliary bed body is lifted or tilted. When separating the main bed body and the auxiliary bed body, it is necessary to rotate the limiting rod 5000 to open the opening of the slot before lifting the auxiliary bed body, so that the rod 3000 can be separated from the slot 4001 and the main bed body and the auxiliary bed body can be used separately.

[0071] The pull-out mechanism has a relatively simple connection mechanism, which can pull out the sofa bed, and the pull-out mechanisms can not contact with each other, but when guidance is needed, a sliding surface is formed by abutment for guiding direction, which leads to the use state of the sofa bed when it is unfolded. At the same time, even if the pull-out mechanism is rusted, the function of the pull-out mechanism will not be greatly affected, and the sofa bed can be clearly disassembled and used separately. If the main bed body continues to maintain the basic functions of the sofa, the auxiliary bed body can be used as a footrest or other sofa stools.

[0072] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include the technical solution composed of any combination of the above technical features. It should be pointed out that for those skilled in the art, several improvements and embellishments can be made without departing from the principle of the present invention, and these improvements and embellishments are also regarded as the protection scope of the present invention.