Bottom bed

Abstract

A bottom bed relates to the technical field of furniture facilities. The bed comprises a lower bed frame, an upper bed frame and a stop structure. The lower bed frame comprises a lower bed frame body and an outer edge which is arranged on the periphery of the lower bed frame body in a surrounding mode and extends upwards. The upper bed frame is assembled on the lower bed frame body in a sliding manner and is used for placing a mattress; the stop structure is arranged between the upper bed frame and the lower bed frame and is used for locking the upper bed frame and the lower bed frame; the stop structure comprises a stop piece, a balance weight piece and a handle. One end of the retainer is rotationally arranged on one surface, facing the lower bedstead body, of the upper bedstead, and the other end of the retainer is a free end for fixedly arranging the counterweight; the handle is arranged at the free end. By the adoption of the technical scheme, the bed has the advantages that the bottom bed can be split, the locking structure is simple and safe, and the upper bed frame can be conveniently and rapidly folded or unfolded relative to the lower bed frame.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture facilities, in particular to a base bed. Background Art

[0002] In daily life, there is a close relationship between the cleanliness of bedding and mattresses and human health. If the mattress is not cleaned and the bedding is not changed for a long time, it is easy to breed bacteria, viruses, fungi and other organisms that affect human health. Especially in hotels, which are service public places that provide accommodation for travelers, frequent cleaning of mattresses and frequent replacement of bedding are even more necessary. In order to facilitate users to change bedding and clean mattresses, there is a base bed that is divided into an upper bed frame and a lower bed frame, and the mattress is placed on the upper bed frame, and the upper bed frame is slidably assembled on the lower bed frame. Further, in order to prevent the upper bed frame from moving when the upper and lower bed frames are closed, affecting the user experience and safety, the existing base bed often adopts two methods for stopping, one is the protrusion structure or the sunken structure stop; the other is the spring brake switch stop; the former solution is easy to damage the casters and the pulling force required to pull the upper bed frame open is large, which is inconvenient to use; the latter solution is expensive, the base bed cannot be separated, transportation is difficult, and there are major safety hazards. Utility Model Content

[0003] The utility model aims to provide a base bed in view of the defects and shortcomings of the prior art, which has the advantages of being able to split the base bed, a simple and safe stop structure, and convenient and quick operation of closing or opening the upper bed frame relative to the lower bed frame.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a bottom bed, comprising:

[0005] The lower bed frame comprises: a lower bed frame body and an outer edge surrounding the lower bed frame body and extending upward;

[0006] An upper bed frame, slidably mounted on the lower bed frame body, for placing a mattress; and

[0007] A stop structure is disposed between the upper bed frame and the lower bed frame, and is used to lock the upper bed frame and the lower bed frame; the stop structure comprises: a stopper, a counterweight, and a handle; one end of the stopper is rotatably disposed on a side of the upper bed frame facing the lower bed frame body, and the other end is a free end for the counterweight to be fixedly disposed; the handle is disposed on the free end;

[0008] When the upper bed frame and the lower bed frame are closed, the free end of the stopper hangs down and is placed on the inner side of the outer edge under the action of the gravity of the counterweight, and the free end abuts against the inner wall of the outer edge to limit the upper bed frame from sliding toward the end of the bed, and one end of the handle is placed on the outer side of the lower bed frame.

[0009] The utility model is further arranged that one end of the handle is fixedly arranged on a side of the stopper facing the lower bed frame body, and the other end is a gripping end for a user to lift.

[0010] The utility model is further arranged that a pulley is fixedly provided on the upper bed frame, and a slide rail corresponding to the pulley is fixedly provided on the lower bed frame body, and the pulley cooperates with the slide rail to enable the upper bed frame to slide relative to the lower bed frame.

[0011] The utility model is further arranged that the slide rail includes: a gasket fixed on the lower bed frame body and a limit stop bar placed on both sides of the gasket, the limit stop bar having a first surface extending upward and a second surface inclined outward, the first surface, the second surface and the gasket together enclose a sliding space for the pulley to slide.

[0012] The utility model is further arranged that a first baffle plate which is arranged perpendicularly to the slide rail is arranged on the lower bed frame body to limit the sliding distance of the upper bed frame relative to the lower bed frame.

[0013] The utility model is further arranged that the distance between the first baffle and the outer edge in the direction of the bed head accounts for 1 / 6 to 1 / 2 of the length of the lower bed frame body.

[0014] The utility model is further arranged that a second baffle plate is arranged perpendicularly to the slide rail and parallel to the first baffle plate on the lower bed frame body near the end of the bed, so as to limit the upper bed frame from sliding excessively toward the head of the bed relative to the lower bed frame.

[0015] The utility model is further configured that three slide rails are provided, which are respectively placed on the left side, the middle and the right side of the lower bed frame body, and the first baffle plate and the second baffle plate divide each slide rail into three independent sections, and each section of the slide rail corresponds to an independent pulley.

[0016] The utility model is further provided that the outer ring of the pulley is provided with a buffer layer.

[0017] The utility model is further configured that the left end, the right end and one end of the lower bed frame body close to the end of the bed are correspondingly shorter than the left end, the right end and one end of the upper bed frame close to the end of the bed.

[0018] After adopting the above technical scheme, the utility model has the following beneficial effects: in the utility model, the upper bed frame is slidably assembled on the lower bed frame body, and the upper bed frame and the lower bed frame are arranged in layers, which is convenient for assembly and transportation. The stop structure is placed between the upper bed frame and the lower bed frame, and includes: a stopper, a counterweight and a handle. Compared with the traditional stop structure, the stop structure is simple and safe, and the operation of closing or opening the upper bed frame and the lower bed frame is also very simple, convenient and fast. When the upper bed frame and the lower bed frame need to be closed, it is only necessary to push the upper bed frame to slide toward the head of the bed relative to the lower bed frame, and the free end of the stopper is drooped and placed on the inner side of the outer edge under the gravity of the counterweight, and the free end abuts against the inner wall of the outer edge to limit the upper bed frame from sliding toward the end of the bed; and at this time, one end of the handle is placed on the outer side of the lower bed frame, and the user only needs to pull the handle to open the upper bed frame relative to the lower bed frame, and the operation process does not require too much user strength and the operation difficulty is low, and it can also ensure that the user is not accidentally injured by the stop structure when using the base bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic diagram of the background bed in a closed state;

[0021] Figure 2 It is a schematic diagram of the structure of the background bed in the open state;

[0022] Figure 3 is a structural schematic diagram of the stop structure;

[0023] Figure 4 It is a schematic diagram of the explosion of the structure of the background bed;

[0024] Figure 5 This is a structural explosion diagram of the background bed from another perspective;

[0025] Figure 6 It is a structural schematic diagram of the base bed in an open state, in which the upper bed frame is hidden but the components originally arranged on the upper bed frame are retained;

[0026] Figure 7 It is a structural schematic diagram of the upper bed frame hidden in the folded state of the base bed but retaining the components originally arranged on the upper bed frame;

[0027] Figure 8 It is a schematic diagram of the structure of the pulley and the slide rail;

[0028] Fig. 9It is a structural diagram from another perspective when the background bed is in a closed state.

[0029] Explanation of the accompanying drawings: 100, upper bed frame; 200, lower bed frame; 210, lower bed frame body; 220, outer edge; 300, stop structure; 310, stop member; 311, free end; 320, counterweight; 330, handle; 410, pulley; 420, slide rail; 421, gasket; 422, limit stop bar; 422a, first surface; 422b, second surface; 510, first baffle plate; 520, second baffle plate; 600, safety device; 610, first safety member; 620, second safety member; 700, anti-jump device; 710, first anti-jump member; 720, second anti-jump member. DETAILED DESCRIPTION

[0030] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0031] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0032] This embodiment relates to a bottom bed, referring to Figure 1-Figure 2 , including: a lower bed frame 200, an upper bed frame 100 and a stop structure 300. The lower bed frame 200 includes: a lower bed frame body 210 and an outer edge 220 surrounding the lower bed frame body 210 and extending upward; the upper bed frame 100 is slidably assembled on the lower bed frame body 210 for placing a mattress. The layered design between the upper bed frame 100 and the lower bed frame 200 optimizes the structure of the bottom bed, facilitates transportation and assembly, and especially when the bottom bed needs to be moved to different rooms or floors, the layered design greatly reduces the difficulty and cost of transportation. Moreover, the upper bed frame 100 is slidably assembled on the lower bed frame body 210, and the mattress is placed on the upper bed frame 100, so that the upper bed frame 100 slides relative to the lower bed frame 200, that is, the mattress can also slide relative to the lower bed frame 200, which is convenient for users to change bedspreads, sheets, etc., and also convenient for users to promptly find garbage mixed at the head of the bed and clean it up in time to ensure the cleanliness of bedding.

[0033] Further, refer to Figure 2-Figure 3The stop structure 300 is arranged between the upper bed frame 100 and the lower bed frame 200, and is used to lock the upper bed frame 100 and the lower bed frame 200 to prevent the upper bed frame 100 from shifting or shaking after the upper bed frame 100 and the lower bed frame 200 are closed; the stop structure 300 includes: a stop member 310, a counterweight member 320 and a handle 330; one end of the stop member 310 is rotatably arranged on a side of the upper bed frame 100 facing the lower bed frame body 210, and the other end is a free end 311 for the counterweight member 320 to be fixed; the function of the counterweight member 320 is that when the upper bed frame 100 and the lower bed frame 200 are closed, the free end 311 of the stop member 310 is naturally drooped and placed on the inner side of the outer edge 220 without human operation by utilizing its own gravity, and the free end 311 of the stop member 310 abuts against the inner wall of the outer edge 220 to limit the upper bed frame 100 from sliding toward the end of the bed. This design simplifies the locking process and improves the user experience. The handle 330 is placed at the free end 311, which is convenient for the user to manually operate the stopper 310. In this embodiment, the handle 330 is designed to have a sufficient length to ensure that when the upper bed frame 100 and the lower bed frame 200 are closed, it can be exposed from the outer side of the outer edge 220 of the lower bed frame 200 in the direction of the bed foot and droop naturally, ensuring the convenience of the user when unlocking the upper bed frame 100 and the lower bed frame 200, that is, opening the upper bed frame 100 and the lower bed frame 200, making the opening method more intuitive and labor-saving.

[0034] Reference Figure 1 and Figure 6 The operation of closing the upper bed frame 100 and the lower bed frame 200 is as follows: push the upper bed frame 100 back toward the head of the bed relative to the lower bed frame 200, the stopper 310 automatically lifts up at the contact point with the edge of the outer edge 220 of the lower bed frame 200 in the direction of the foot of the bed, the upper bed frame 100 slides to the set position, i.e., the head of the bed, the free end 311 of the stopper 310 hangs down under the gravity of the counterweight 320 and is placed on the inner side of the outer edge 220 of the lower bed frame 200 in the direction of the foot of the bed, the free end 311 abuts against the inner wall of the outer edge 220, and at this time, one end of the handle 330 naturally hangs down and is placed on the outer side of the lower bed frame 200. The process is simple, convenient and fast to operate, and does not require excessive consumption of the user's physical strength.

[0035] Reference Figure 2 and Figure 7 The operation of opening the upper bed frame 100 and the lower bed frame 200 is as follows: pull the handle 330, raise the free end 311 of the stopper 310 and make it higher than the outer edge 220 of the lower bed frame 200 in the bed end direction, and at the same time push the upper bed frame 100 relative to the lower bed frame 200 in the bed end direction. When the upper bed frame 100 slides, release the handle 330, and the stopper 310 automatically droops naturally, and the upper bed frame 100 and the lower bed frame 200 are opened at this time. The overall operation is also simple, convenient and fast, and the upper bed frame 100 and the lower bed frame 200 can be opened without excessive pulling force, which is suitable for a wide range of user groups.

[0036] In this embodiment, one end of the stopper 310 is rotatably disposed on the side of the upper bed frame 100 facing the lower bed frame body 210 through a hinge. In other embodiments, one end of the stopper 310 can also be rotatably disposed on the side of the upper bed frame 100 facing the lower bed frame body 210 through a rotating shaft.

[0037] In this embodiment, refer to Figure 1-Figure 2 as well as Figure 4 One end of the handle 330 is fixedly arranged on the side of the stopper 310 facing the lower bed frame body 210, and the other end is a gripping end for the user to pull. It not only ensures a fixed connection with the stopper 310, so that when the upper bed frame 100 and the lower bed frame 200 need to be opened, the free end 311 of the stopper 310 can be raised by pulling the handle 330; it is also convenient for the user to grip. In this embodiment, the handle 330 is a flexible leather handle 330. In some embodiments, the handle 330 can also be a flexible handle 330 of other materials on the market.

[0038] Further, refer to Figure 4-Figure 7 The upper bed frame 100 is fixedly provided with a pulley 410, and the lower bed frame body 210 is fixedly provided with a slide rail 420 corresponding to the pulley 410. The pulley 410 cooperates with the slide rail 420 to enable the upper bed frame 100 to slide relative to the lower bed frame 200. The cooperation between the pulley 410 and the slide rail 420 here ensures that the upper bed frame 100 can slide smoothly relative to the lower bed frame 200 and assists the user to pull out the upper bed frame 100, while reducing the pulling force required for the user to pull out the upper bed frame 100. At the same time, it also plays a role in supporting the weight of the upper bed frame 100, the mattress and the user, ensuring smooth sliding during the sliding process to avoid collapse.

[0039] In this embodiment, refer to Figure 8The slide rail 420 includes: a gasket 421 fixed on the lower bed frame body 210 and a limit stop bar 422 placed on both sides of the gasket 421. The limit stop bar 422 has a first surface 422a extending upward and a second surface 422b inclined outward. The first surface 422a, the second surface 422b and the gasket 421 together enclose a sliding space for the pulley 410 to slide. The gasket 421 can effectively reduce the friction between the pulley 410 and the contact surface. The function of the limit stop bar 422 is to limit the sliding range of the pulley 410 and prevent it from swinging left and right. Specifically, the first surface 422a extending upward and the gasket 421 form a limited space in the vertical direction to prevent the pulley 410 from derailing during the sliding process and ensure its consistency in the sliding direction, so as to prevent the upper bed frame 100 from being misaligned relative to the lower bed frame 200 after sliding. The second surface 422b tilted outward plays a role in guiding and preventing the pulley 410 from derailing. When the pulley 410 accidentally derails, the tilted second surface 422b guides the pulley 410 back to the correct sliding space. In this embodiment, the limit stop bar 422 is specifically a trapezoidal wooden bar with the same length and a right-angled trapezoidal cross section. In some embodiments, the limit stop bar 422 can also be a stop bar with the same length and other polygonal cross sections.

[0040] Further, refer to Figure 5-Figure 7 A first baffle 510 is provided on the lower bed frame body 210 and is perpendicular to the slide rail 420 to limit the sliding distance of the upper bed frame 100 relative to the lower bed frame 200, thereby preventing the upper bed frame 100 from tilting due to excessive sliding distance of the upper bed frame 100 relative to the lower bed frame 200, thereby increasing the safety of the user during use and promptly reminding the user that the upper bed frame 100 has slid into place relative to the lower bed frame 200.

[0041] In this embodiment, the distance between the first baffle 510 and the outer edge 220 in the direction of the bed head accounts for 1 / 6 to 1 / 2 of the length of the lower bed frame body 210. On the one hand, it is to prevent the first baffle 510 from being too close to the outer edge 220 in the direction of the bed head, resulting in the upper bed frame 100 sliding out of the lower bed frame 200. The part is too short, which makes it inconvenient for users to change bedding; on the other hand, it is to prevent the upper bed frame 100 sliding out of the lower bed frame 200 from sliding out too long, thereby occupying too much space in the user's room. At the same time, it is also to prevent the upper bed frame 100 from tilting or even tipping over immediately due to unbalanced force when heavy objects are placed on the sliding part of the upper bed frame 100, endangering the safety of users.

[0042] In this embodiment, the distance between the first baffle 510 and the outer edge 220 in the bedside direction accounts for 1 / 3 of the length of the lower bed frame body 210, ensuring that after the upper bed frame 100 slides relative to the lower bed frame 200, most of the upper bed frame 100 is still located above the lower bed frame 200, ensuring the stability of the overall structure during use. In addition, this distance is the depth distance of most bedside tables, which reduces the interference of the bedside tables on the work of changing bedding, and is convenient for users to change bedding and clean mattresses. In some embodiments, the distance between the first baffle 510 and the outer edge 220 in the bedside direction can also account for 1 / 4, 5 / 12, or 7 / 24 of the length of the lower bed frame body 210. It is sufficient that the distance between the first baffle 510 and the outer edge 220 in the bedside direction accounts for 1 / 6 to 1 / 2 of the length of the lower bed frame body 210, and no specific limitation is made here. Preferably, the distance between the first baffle 510 and the outer edge 220 in the bedside direction accounts for 1 / 3 of the length of the lower bed frame body 210.

[0043] Further, refer to Figure 5-Figure 7 A second baffle 520 is disposed on the lower bed frame body 210 near the bed foot direction, which is perpendicular to the slide rail 420 and parallel to the first baffle 510, to limit the upper bed frame 100 from sliding excessively toward the bed head relative to the lower bed frame 200, and prevent the upper bed frame 100 from sliding excessively toward the bed head and damaging the wall. In this embodiment, the distance between the second baffle 520 and the outer edge 220 in the bed foot direction accounts for 1 / 3 of the length of the lower bed frame body 210. The first baffle 510 and the second baffle 520 cooperate to limit the sliding distance range of the upper bed frame 100 relative to the lower bed frame 200 in the bed foot direction or the bed foot direction.

[0044] In this embodiment, refer to Figure 5-Figure 7 , there are three slide rails 420, which are respectively placed on the left side, the middle part and the right side of the lower bed frame body 210. The first baffle 510 and the second baffle 520 divide each slide rail 420 into three independent sections, and each slide rail 420 corresponds to an independent pulley 410. The setting of multiple slide rails 420 enables the upper bed frame 100 to receive more uniform support and sliding guidance when sliding, reducing the shaking or deviation caused by the uneven force of a single slide rail 420. The design of segmented slide rails 420 and corresponding independent pulleys 410, on the one hand, further increases the stability of sliding, reduces the deflection during long-distance sliding through multiple slide rails 420, and facilitates installation and positioning maintenance; on the other hand, each slide rail 420 corresponds to an independent pulley 410, that is, each pulley 410 slides in the corresponding slide rail 420, which improves the smoothness of sliding, avoids the wear caused by the long-distance sliding of the pulley 410, and increases its service life.

[0045] Furthermore, a buffer layer is provided on the outer ring of the pulley 410, which is used to reduce noise, reduce friction, protect the slide rail 420, and extend the service life of the slide rail 420 and the pulley 410. In this embodiment, the buffer layer is a buffer rubber layer. In other embodiments, the buffer layer can also be a buffer silicone layer.

[0046] In this embodiment, refer to Fig. 9 The left end, right end and one end near the end of the bed of the lower bed frame body 210 are correspondingly shorter than the left end, right end and one end near the end of the bed of the upper bed frame 100, that is, there is a size difference between the left end, right end and one end near the end of the bed of the upper bed frame 100 and the lower bed frame 200, and the two are flush in the direction of the head of the bed. Specifically, the side of the upper bed frame 100 facing the lower bed frame 200 is concave inward, and when combined with the lower bed frame 200, the upper bed frame 100 is entirely covered on the lower bed frame 200, and the outer edge 220 of the lower bed frame 200 and the lower edge of the upper bed frame 100 are staggered due to the size difference between the upper bed frame 100 and the lower bed frame 200 to prevent mutual scraping.

[0047] In addition, in this embodiment, in order to prevent the upper bed frame 100 from tilting relative to the lower bed frame 200, a safety device 600 is provided between the upper bed frame 100 and the lower bed frame 200. Figure 6 and Figure 7 The safety device 600 includes: a first safety piece 610 fixedly arranged on the side of the upper bed frame 100 facing the lower bed frame 200 and a second safety piece 620 fixedly arranged on the side of the lower bed frame 200 facing the upper bed frame 100 and cooperating with the first safety piece 610. The first safety piece 610 is specifically a U-shaped iron sheet, one side of the U-shaped iron sheet is a long side, and the other side is a short side. The long side is longer than the short side, and a through hole is arranged on the long side. The long side is fixedly arranged on the side of the upper bed frame 100 facing the lower bed frame 200 by self-tapping screws, and is the fixed side. The second safety piece 620 is an I-shaped iron sheet, one end of which is fixed on the side of the lower bed frame 200 facing the upper bed frame 100, and the other end is an insertion end. When the upper bed frame 100 slides relative to the lower bed frame 200 toward the end of the bed, the short side of the U-shaped iron sheet gradually approaches the I-shaped iron sheet during the sliding process until the insertion end of the I-shaped iron sheet is inserted into the gap between the long side and the short side of the U-shaped iron sheet, and the short side hooks the lower surface of the insertion end, and the safety device 600 is in a locked state. To unlock the safety device 600, it is only necessary to slide the upper bed frame 100 relative to the lower bed frame 200 toward the head of the bed until the insertion end of the I-shaped iron sheet is out of the gap between the long side and the short side of the U-shaped iron sheet, which is simple and convenient to operate.

[0048] In this embodiment, refer to Figure 6 and Figure 7An anti-jump device 700 is also provided between the foot of the upper bed frame 100 and the foot of the lower bed frame 200, for preventing the upper bed frame 100 from jumping when the upper bed frame 100 and the lower bed frame 200 are closed. The anti-jump device 700 includes: a first anti-jump member 710 disposed at the foot of the upper bed frame 100 and a second anti-jump member 720 disposed at the foot of the lower bed frame 200 and cooperating with the first anti-jump member 710. The first anti-jump member 710 is configured as an anti-jump slide rail fixedly disposed on the side of the upper bed frame 100 facing the lower bed frame 200, and the second anti-jump member 720 is configured as an anti-jump pulley fixedly disposed on the lower bed frame 200 and cooperating with the anti-jump slide rail. The anti-jump pulley and the anti-jump slide rail can effectively provide support for the foot of the upper bed frame 100, avoid sudden jumping and shaking of the upper bed frame 100, reduce the impact force between the upper bed frame 100 and the lower bed frame 200, extend the overall service life of the bed body and reduce the noise generated by jumping.

[0049] The above is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A substrate, characterized in that: include: The lower bed frame (200) comprises: a lower bed frame body (210) and an outer edge (220) arranged around the lower bed frame body (210) and extending upward; An upper bed frame (100) is slidably mounted on the lower bed frame body (210) and is used for placing a mattress; and A stop structure (300) is disposed between the upper bed frame (100) and the lower bed frame (200) and is used to lock the upper bed frame (100) and the lower bed frame (200); the stop structure (300) comprises: a stop member (310), a counterweight member (320) and a handle (330); one end of the stop member (310) is rotatably disposed on a side of the upper bed frame (100) facing the lower bed frame body (210), and the other end is a free end (311) for fixing the counterweight member (320); the handle (330) is disposed on the free end (311); When the upper bed frame (100) and the lower bed frame (200) are closed, the free end (311) of the stopper (310) hangs down and is placed on the inner side of the outer edge (220) under the action of the gravity of the counterweight (320), and the free end (311) abuts against the inner wall of the outer edge (220) to limit the upper bed frame (100) from sliding toward the end of the bed, and one end of the handle (330) is placed on the outer side of the lower bed frame (200).

2. The bottom bed according to claim 1, characterized in that: One end of the handle (330) is fixedly arranged on a side of the stopper (310) facing the lower bed frame body (210), and the other end is a gripping end for a user to pull.

3. The bottom bed according to claim 1, characterized in that: A pulley (410) is fixedly provided on the upper bed frame (100), and a slide rail (420) corresponding to the pulley (410) is fixedly provided on the lower bed frame body (210); the pulley (410) cooperates with the slide rail (420) to enable the upper bed frame (100) to slide relative to the lower bed frame (200).

4. The bottom bed according to claim 3, characterized in that: The slide rail (420) comprises: a gasket (421) fixed on the lower bed frame body (210) and limit stop bars (422) arranged on both sides of the gasket (421); the limit stop bars (422) have a first surface (422a) extending upward and a second surface (422b) inclined outward; the first surface (422a), the second surface (422b) and the gasket (421) together enclose a sliding space for the pulley (410) to slide.

5. The bottom bed according to claim 3, characterized in that: The lower bed frame body (210) is provided with a first baffle (510) vertically arranged with respect to the slide rail (420) to limit the sliding distance of the upper bed frame (100) relative to the lower bed frame (200).

6. The bottom bed according to claim 5, characterized in that: The distance between the first baffle (510) and the outer edge (220) in the direction of the bed head is 1 / 6 to 1 / 2 of the length of the lower bed frame body (210).

7. The bottom bed according to claim 6, characterized in that: A second baffle (520) is arranged on the lower bed frame body (210) near the end of the bed and is perpendicular to the slide rail (420) and parallel to the first baffle (510) to limit the upper bed frame (100) from sliding excessively toward the head of the bed relative to the lower bed frame (200).

8. The bottom bed according to claim 7, characterized in that: There are three slide rails (420), which are respectively arranged on the left side, the middle part and the right side of the lower bed frame body (210); the first baffle plate (510) and the second baffle plate (520) divide each slide rail (420) into three independent sections; each section of the slide rail (420) corresponds to an independent pulley (410).

9. The bottom bed according to any one of claims 3 to 8, characterized in that: The outer ring of the pulley (410) is provided with a buffer layer.

10. The bottom bed according to any one of claims 3 to 8, characterized in that: The left end, the right end and one end close to the end of the bed of the lower bed frame body (210) are correspondingly shorter than the left end, the right end and one end close to the end of the bed of the upper bed frame (100).

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