Backrest bed frame

Abstract

This invention provides a push-back bed frame, comprising a fixed frame and a rotating frame. One end of the rotating frame is rotatably connected to the fixed frame. The fixed frame is equipped with a drive assembly for rotating the rotating frame. The fixed frame includes two L-shaped connectors or U-shaped connectors with upward openings on both sides. The rotating frame includes two square tubes on both sides, one end of which is rotatably fitted into the right-angle area of ​​the corresponding L-shaped connector or the groove of the U-shaped connector. A gap is provided between the sidewall of the square tube and the sidewall of the L-shaped or U-shaped connector to prevent hand pinching. This invention provides a push-back bed frame with a simple structure, convenient adjustment, and a small frame width when folded; it also effectively prevents hand pinching during use.

Description

Technical Field

[0001] This invention relates to the field of bed frame technology, specifically a backrest bed frame. Background Technology

[0002] A bed is an essential piece of furniture for sleeping. Standard beds typically have fixed dimensions, with 1.6-meter and 1.8-meter sizes being the most common. To improve the comfort and functionality of a bed, it's necessary to accommodate not only supine sleeping positions but also various reclining angles and healthcare needs. Currently, if a user requires a fixed bed to have these adjustable features, a new, specialized adjustable bed is needed, leading to resource waste and increased costs.

[0003] Although technological advancements have led to the development of backrest structures that can be directly applied to existing fixed beds to adjust the user's back height, these structures typically include a fixed frame and a rotating frame. Currently, the side frames of both the rotating and fixed frames are made of square tubing, and the two square tubings are designed to work together in a scissor-like manner. There is no anti-pinch design between them, making it easy for fingers to get caught when they are closed. Furthermore, the overall frame width is too large when fully closed. Summary of the Invention

[0004] The problem solved by this invention is to overcome the defects in the prior art by providing a push-back bed frame with a simple structure, convenient adjustment, small frame width when folded, and effectively preventing users from getting their hands pinched during use.

[0005] To address the aforementioned problems, this invention provides a push-back bed frame, comprising a fixed frame and a rotating frame. One end of the rotating frame is rotatably connected to the fixed frame. The fixed frame is provided with a drive assembly for driving the rotating frame to rotate. The fixed frame includes two L-shaped connectors or U-shaped connectors with upward openings on both sides. The rotating frame includes two square tubes on both sides, with one end of each square tube rotatably connected to the right-angle region of the L-shaped connector or the groove of the U-shaped connector. Furthermore, an anti-pinch gap is provided between the sidewall of the square tube and the inner sidewall of the L-shaped connector or the U-shaped connector.

[0006] The push-back bed frame of the present invention has the following advantages compared with the prior art:

[0007] The push-back bed frame structure of this invention comprises only a fixed frame, a rotating frame, and a drive structure for driving the rotating frame to rotate and lift. The overall structure is simple and easy to operate. The fixed frame at the bottom has L-shaped connectors or U-shaped connectors with upward openings on both sides, while the rotating frame at the top has square tubes on both sides. Anti-pinch gaps are provided between the square tubes and the side walls of the L-shaped connectors or the inner side walls of the U-shaped connectors to effectively avoid the danger of pinching hands during use and improve safety performance. In addition, the two square tube structures are rotated in the right-angle area of ​​the L-shaped connectors or in the inner groove of the U-shaped connectors. When stored, the overall frame size of the push-back bed frame is further reduced, thereby reducing the weight of the overall device and the packaging size.

[0008] Furthermore, the fixed frame also includes a first crossbar and a second crossbar, with the first and second crossbars respectively connected between the front and rear ends of the two L-shaped or U-shaped connectors. One end of the drive assembly is connected to the first crossbar, and the other end is connected to the rotating frame. In the above structure, the corresponding crossbar structure enables the assembly of the overall frame structure, facilitating the separate packaging of each component and reducing the external dimensions of individual components.

[0009] Furthermore, the rotating frame also includes a third crossbar, with its two ends connected to the other ends of the two square tubes respectively. The end of the drive assembly furthest from the first crossbar is connected to the third crossbar. In this structure, the two square tubes are connected by the third crossbar to ensure the structural stability of the rotating frame. Additionally, the other end of the drive assembly is connected to the third crossbar to ensure the stability of the drive structure.

[0010] Preferably, the drive assembly includes an electric actuator, with its two ends hinged to a first crossbar and a third crossbar, respectively. In the above structure, the drive assembly is preferably an electric actuator, which is simple in structure, provides stable drive, and is easy to operate.

[0011] As an improvement, a hinge shaft parallel to the third crossbar is rotatably connected to it. One end of the electric push rod is hinged to the hinge shaft, and an auxiliary push rod is also provided on the hinge shaft. A supporting vertical rod connects the first and second crossbars. In the initial state, the auxiliary push rod is horizontally abutting the upper surface of the supporting vertical rod, and the end of the auxiliary push rod away from the hinge shaft extends towards the position of the first crossbar. During the initial stage of the lifting movement of the rotating frame, the auxiliary push rod rotates away from the first crossbar, and the end of the auxiliary push rod away from the hinge shaft slides against the upper surface of the supporting vertical rod. In the above improved structure, an auxiliary push rod is added in combination with the electric push rod to achieve automated and flexible driving of the rotation of the rotating frame.

[0012] In a further improvement, the lengths of the first, second, and third crossbars are all adjustable. In this improved structure, the adjustable length of each crossbar allows the backrest bed frame to be adapted to fixed beds of different widths, thus improving versatility.

[0013] In a further improvement, the first, second, and third crossbars each include a first connecting tube, with second connecting tubes slidably nested at both ends of the first connecting tube. The other end of each second connecting tube is respectively connected to the outer wall of the L-shaped or U-shaped connector. In this improved structure, the length of each crossbar is adjusted by axial sliding between the nested connecting tubes, resulting in a simple structure and convenient adjustment.

[0014] In a further improvement, the first connecting tube is an outer square tube with a larger size than the second connecting tube, and the second connecting tube is an inner square tube that matches the inner hole of the outer square tube. The outer wall of the inner square tube has multiple threaded holes extending along its length. Adjusting bolts are inserted at both ends of the outer square tube, and the inner end of each adjusting bolt can be fitted into any of the threaded holes. In this improved structure, the nested first and second connecting tubes are the outer and inner square tubes, respectively, and the square tubes provide an anti-rotation effect. Furthermore, multiple threaded holes are provided on the inner tube, and the adjusting bolts on the outer square tube engage with these threaded holes at different positions, ensuring stable positioning of the outer and inner square tubes when adjusted to multiple different positions.

[0015] In a further improvement, the rotating frame is connected between the two square tubes, featuring multiple retractable webbing strips for supporting the mattress and the human body. In this improved structure, the retractable webbing strips provide better comfort as support for the mattress and the human body, and the structure is simpler, easier to install, and less expensive.

[0016] Preferably, the two sides of the fixed frame are L-shaped connectors, and one end of the square tube is rotatably connected to the vertical plate of the L-shaped connector via a hinge shaft; a positioning element for limiting the anti-pinch gap is connected between the square tube and the vertical plate. This improved structure makes installation more convenient, and in the flat position, the square tube can be accommodated within the right-angle area of ​​the L-shaped connector, saving space and reducing weight; furthermore, the positioning element accurately limits the gap, achieving the anti-pinch function. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the push-back bed frame of the present invention.

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point X in the diagram.

[0019] Figure 3This is a schematic diagram of the structure of the backrest bed frame of the present invention, which is adjusted to another width.

[0020] Figure 4 This is a schematic diagram of the structure of the push-back bed frame of the present invention after it is equipped with retractable webbing.

[0021] Figure 5 This is an exploded view of the connection structure between the square tube and the L-shaped connector of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Fixed frame; 1.1 L-shaped connector; 1.1.1 Vertical plate; 1.1.2 Positioning hole; 1.2 First horizontal bar; 1.3 Second horizontal bar; 1.4 Supporting vertical bar; 2. Rotating frame; 2.1 Square tube; 2.1.1 Mounting hole; 2.2 Third horizontal bar; 3. Electric push rod; 4. Hinge shaft; 5. Auxiliary push rod; 6. First connecting tube; 7. Second connecting tube; 8. Adjusting bolt; 9. Telescopic webbing; 10. L-shaped sheet metal; 11. Fastening bolt; 12. Positioning component; 12.1 Connecting shaft; 12.2 Positioning shaft; 12.3 Positioning pin; 13. Connecting screw; 14. Limiting baffle. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] In the description of this invention, it should be noted that the terms "front," "rear," "outer wall," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, in the description of this invention, the terms "first" and "second" are used only for convenience of description and distinction, and do not have any specific meaning.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Implementation 1:

[0028] like Figure 1 , 2As shown, the present invention provides a backrest bed frame for use at the head end of an existing fixed bed. Specifically, it includes a fixed frame 1 and a rotating frame 2. The fixed frame 1 is placed horizontally near the upper end of the existing fixed bed board, and the rotating frame 1 is located above the fixed frame 1. One end of the rotating frame 2 is rotatably connected to one end of the fixed frame 1. Correspondingly, a drive assembly for driving the rotating frame 2 to rotate is connected to the fixed frame 1. By driving the rotating frame 2 to rotate through the drive assembly, the backrest is raised, allowing the user to rest against the inclined rotating frame 2. This allows the user to adjust to different lying positions without replacing the original fixed bed to meet higher comfort requirements.

[0029] More specifically, the fixed frame 1 includes two L-shaped connectors 1.1 with outward openings on both sides. The rotating frame 2 includes two square tubes 2.1 on both sides, with one end of each square tube 2.1 rotatably engaging within the right-angle region of the corresponding L-shaped connector 1.1. Specifically, the right-angle region refers to the area formed between the vertical plate 1.1.1 and the horizontal plate of the L-shaped connector 1.1. Furthermore, in the above structure, a pinch-proof gap is provided between the sidewall of the square tube 2.1 and the vertical plate 1.1.1 of the L-shaped connector 1.1 to prevent users from pinching their hands when adjusting the rotating frame 2. More specifically, the pinch-proof gap in the above structure is less than or equal to 5mm or greater than 25mm. This effectively prevents users' fingers from entering the gap between the two components without affecting the rotation between the square tube 2.1 and the L-shaped connector 1.1, thus improving safety. In this embodiment, the preferred pinch-proof gap is set to be greater than 25mm.

[0030] like Figure 2 As shown, in this embodiment, a positioning element 12 is connected between the square tube 2.1 and the vertical plate 1.1.1. This positioning element 12 effectively controls the gap to prevent hand pinching, facilitating installation. More specifically, as... Figure 5As shown, the positioning component 12 includes a connecting shaft 12.1, one end of which is provided with a positioning shaft 12.2, and the diameter of the positioning shaft 12.2 is larger than the diameter of the connecting shaft 12.1. A positioning insertion hole 1.1.2 is provided on the vertical plate 1.1.1, and a positioning insertion post 12.3 is provided at the end of the positioning shaft 12.2 away from the connecting shaft 12.1. Additionally, a fitting hole 2.1.1 is provided at the end of the square tube 2.1 that connects to the L-shaped connector 1.1. During installation, the positioning insertion post 12.3 on the connecting shaft 12.1 is first inserted into the positioning insertion hole 1.1.2, and then the square tube 2.1 is inserted into the connecting shaft 12.1 through the fitting hole 2.1.1 until the side wall of the square tube 2.1 abuts against the side wall of the positioning shaft 12.2. Finally, the square tube 2.1 and the connecting shaft 12.1 are connected and fixed on the other side of the square tube 2.1 by connecting screws 13.

[0031] In this embodiment, the L-shaped connector 1.11 is preferably an L-shaped angle steel, which can be directly selected as a conventional standard part, thus improving processing efficiency. In addition, in the above structure, one end of the square tube 2.1 is rotatably connected to the vertical plate 1.1.1 of the L-shaped connector 1.1, which is convenient for installation. Furthermore, when lying flat, the square tube 2.1 can be accommodated in the right-angle area of ​​the L-shaped connector 1.1, saving space.

[0032] like Figure 1 As shown, in this embodiment, the fixed frame 1 includes not only the two L-shaped connectors 1.1 mentioned above, but also a first crossbar 1.2 and a second crossbar 1.3. The first crossbar 1.2 and the second crossbar 1.3 are respectively connected between the front and rear ends of the two L-shaped connectors 1.1, so that the first crossbar 1.2, the second crossbar 1.3 and the two L-shaped connectors 1.1 form a rectangular frame. One end of the driving component is connected to the first crossbar 1.2, and the other end is connected to the rotating frame 2.

[0033] Similarly, in addition to the two square tubes 2.1, the rotating frame 2 in the above structure also includes a third crossbar 2.2. The two ends of the third crossbar 2.2 are respectively connected to the other ends of the two square tubes 2.1 to form a gate-shaped frame. In addition, the end of the drive component away from the first crossbar 1.2 is connected to the third crossbar 2.2 to ensure the stability of the drive structure.

[0034] Furthermore, the driving component in this embodiment includes an electric push rod 3, with its two ends hinged to the first crossbar 1.2 and the third crossbar 2.2, respectively. The extension and retraction of the electric push rod 3 enables the rotating frame 2 to rotate up and down relative to the fixed frame 1, thereby adjusting the user's backrest angle. On another note, in the above structure, when the rotating frame 2 and the fixed frame 1 are in a horizontal position during non-use, the electric push rod 3 alone may cause difficulties in automatically raising the rotating frame 2 due to the overly gentle driving force. During the driving process, manual upward force application to the rotating frame 2 may be necessary, resulting in a low degree of automation in the backrest adjustment mechanism.

[0035] Therefore, this embodiment further improves the above structure. Specifically, a U-shaped mounting bracket is connected to the middle of the outer wall of the third crossbar 2.2. A hinge shaft 4 parallel to the U-shaped mounting bracket is rotatably connected between the two side walls of the U-shaped mounting bracket. In addition, a connecting plate is provided on the hinge shaft 4. One end of the electric push rod 3 is hinged to the connecting plate, and an auxiliary push rod 5 is also provided on the hinge shaft 4. Furthermore, a supporting vertical rod 1.4 is connected between the first crossbar 1.2 and the second crossbar 1.3. The other end of the auxiliary push rod 5 is slidably engaged with the supporting vertical rod 1.4. In this structure, initially, the electric push rod 3 is in a retracted state, and the electric push rod 3, auxiliary push rod 5, and supporting vertical rod 1.4 are in approximately parallel positions (not shown in the figure). The auxiliary push rod 5 is against the upper end of the supporting vertical rod 1.4, and the end of the auxiliary push rod 5 away from the hinge axis 4 is facing the position of the first horizontal rod 1.2. When it is necessary to adjust the angle of the rotating frame 2, the movable rod of the electric push rod 3 slowly extends outward. Under the pushing force of the electric push rod 3, the hinge axis 4 rotates, thereby driving the auxiliary push rod 5 to rotate around the hinge axis 4 in a direction away from the first horizontal rod 1.2. Furthermore, during the rotation process, the outer end face of the auxiliary push rod 5 always slides against the upper end of the supporting vertical rod 1.4. As the auxiliary push rod 5 slowly moves away from the first horizontal rod 1.2, it drives the rotating frame 2 to slowly rise. When the angle between the rotating frame 2 and the fixed frame 1 reaches the set angle, the electric push rod 3 continues to extend, smoothly driving the rotating frame 2 to rotate around the connection point with the fixed frame 1. Thus, the height adjustment process of the rotating frame 2 does not require manual lifting, achieving fully automated adjustment and improving adjustment efficiency.

[0036] In addition, in the above-mentioned structure for the rotation of the auxiliary rotating frame 2, in order to prevent the auxiliary push rod 5 from rotating away from the supporting vertical rod 1.4 under the action of the electric push rod 3, thus affecting the normal lifting movement of the rotating frame 2, a limiting baffle 14 is also provided on the U-shaped mounting bracket in this embodiment. The limiting baffle 14 is located above the hinge shaft 4, so that when the electric push rod 3 drives the auxiliary push rod 5 to start rotating from the initial myopia level position, the auxiliary push rod 5 can only rotate downward (counterclockwise), thereby playing the role of assisting the lifting of the rotating frame 2.

[0037] Furthermore, in this embodiment, the lengths of the first crossbar 1.2, the second crossbar 1.3, and the third crossbar 2.2 are all adjustable, allowing the aforementioned back-pushing bed frame to be flexibly adjusted in width according to different bed widths. Specifically, the first crossbar 1.2, the second crossbar 1.3, and the third crossbar 2.2 each include a first connecting pipe 6, with second connecting pipes 7 slidably nested at both ends of the first connecting pipe 6. The other end of each second connecting pipe 7 is respectively connected to the outer wall of the square tube 2.1 or the outer wall of the L-shaped connector 1.1. Preferably, the first connecting tube 6 is an outer square tube with a larger size than the second connecting tube 7, and the second connecting tube 7 is an inner square tube that matches the inner hole of the outer square tube 6. Multiple threaded holes 7.1 extending along the length of the inner square tube are provided on its outer wall. Adjusting bolts 8 are correspondingly inserted at both ends of the outer square tube. The inner end of the adjusting bolt 8 can be fitted into any of the aforementioned threaded holes 7.1. When it is necessary to adjust the width of the backrest bed frame, first loosen the corresponding adjusting bolt 8, then adjust the relative position of the outer square tube and the inner square tube. After adjusting to the required size, ensure that the adjusting bolt 8 matches the corresponding threaded hole 7.1 on the inner square tube. Finally, tighten the adjusting bolt 8 so that its end fits into the corresponding threaded hole 7.1. The structure is simple and the adjustment is convenient.

[0038] On the other hand, multiple retractable webbing 9 are connected between the two square tubes 2.1 on the rotating frame 2. These webbing 9 are used to support the mattress and the human body when the rotating frame 2 is raised. The tightness of the retractable webbing 9 can be manually adjusted. Compared with the rigid support plate structure, the connection is simple, convenient and low cost. In addition, the retractable webbing 9 has a certain degree of flexible support, which provides better comfort when supporting the back of the human body.

[0039] Other, such as Figure 3As shown, L-shaped sheet metal 10s are connected to both ends of the support vertical rod 1.4. Corresponding connecting screw holes are provided on the inner walls of the first horizontal rod 1.2 and the second horizontal rod 1.3 at the middle position. Fastening bolts 11 are passed through each L-shaped connector 1.1. When connecting the support vertical rod 1.4 with the first horizontal rod 1.2 and the second horizontal rod 1.3, firstly, the two L-shaped sheet metal 10s are fitted together on the first horizontal rod 1.2 and the second horizontal rod 1.3, and then the fastening bolts 11 are tightened so that their ends fit into the corresponding connecting screw holes on the first horizontal rod 1.2 and the second horizontal rod 1.3. This allows for convenient disassembly and assembly of the support vertical rod 1.4 with the first horizontal rod 1.2 and the second horizontal rod 1.3, saving packaging space and making it convenient for users to assemble themselves.

[0040] Implementation 2:

[0041] The structure of this embodiment is basically the same as that of Embodiment 1, the only difference being that the L-shaped connector 1.1 in Embodiment 1 can be replaced with a U-shaped connector structure with the opening facing upwards, which is not shown in the figure. With this structure, when the rotating bracket 2 and the fixed bracket 1 are folded and closed, the square tubes 2.1 on both sides of the rotating bracket 2 can also be accommodated in the U-shaped groove of the U-shaped connector, and a gap to prevent hand pinching is left between the square tube 2.1 and the two inner side walls of the U-shaped groove; compared with the existing structure of two square tubes cross-hinged, the width of the overall back-pushing bed frame is also reduced, thus reducing the overall weight.

[0042] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A backrest bed frame, comprising a fixed frame (1) and a rotating frame (2), one end of the rotating frame (2) being rotatably connected to the fixed frame (1), the fixed frame (1) being provided with a drive assembly for driving the rotating frame (2) to rotate, characterized in that: the fixed frame (1) comprises two L-shaped connectors (1.1) located on both sides thereon or U-shaped connectors with openings facing upwards, the rotating frame (2) comprises two square tubes (2.1) located on both sides thereon, one end of each of the two square tubes (2.1) being rotatably connected to the right-angle area of ​​the L-shaped connector (1.1) or the groove of the U-shaped connector, and multiple retractable webbing (9) for supporting the mattress and the human body are connected between the two square tubes (2.1) on the rotating frame (2), and the sidewall of the square tube (2.1) is connected to the vertical plate of the L-shaped connector (1.1) ( A positioning element (12) is connected between 1.1.1) or between the U-shaped connector and any inner wall of the connector to form an anti-pinch gap; The fixed frame (1) further includes a first crossbar (1.2) and a second crossbar (1.3), and the first crossbar (1.2) and the second crossbar (1.3) are respectively connected between the front and rear ends of the two L-shaped connectors (1.1) or U-shaped connectors. The rotating frame (2) further includes a third crossbar (2.2), and the two ends of the third crossbar (2.2) are respectively connected to the other ends of the two square tubes (2.1). The lengths of the first crossbar (1.2), the second crossbar (1.3) and the third crossbar (2.2) are all adjustable.

2. The back-pushing bed frame according to claim 1, characterized in that: One end of the drive assembly is connected to the first crossbar (1.2), and the other end is connected to the rotating frame (2).

3. The back-pushing bed frame according to claim 2, characterized in that: The end of the drive assembly away from the first crossbar (1.2) is connected to the third crossbar (2.2).

4. The push-back bed frame according to claim 3, characterized in that: The drive assembly includes an electric push rod (3), the two ends of which are respectively hinged to the first crossbar (1.2) and the third crossbar (2.2).

5. The push-back bed frame according to claim 4, characterized in that: A hinge shaft (4) parallel to the third crossbar (2.2) is rotatably connected to it. One end of the electric push rod (3) is hinged to the hinge shaft (4), and an auxiliary push rod (5) is also provided on the hinge shaft (4). A supporting vertical rod (1.4) is connected between the first crossbar (1.2) and the second crossbar (1.3). In the initial state, the auxiliary push rod (5) is horizontally attached to the upper surface of the supporting vertical rod (1.4), and the end of the auxiliary push rod (5) away from the hinge shaft (4) extends toward the position of the first crossbar (1.2). At the beginning stage of the lifting movement of the rotating frame (2), the auxiliary push rod (5) rotates away from the first crossbar (1.2), and the end of the auxiliary push rod (5) away from the hinge shaft (4) slides against the upper surface of the supporting vertical rod (1.4).

6. The push-back bed frame according to claim 5, characterized in that: The first crossbar (1.2), the second crossbar (1.3) and the third crossbar (2.2) all include a first connecting tube (6), and the two ends of the first connecting tube (6) are slidably nested with second connecting tubes (7). The other end of each second connecting tube (7) is respectively connected to the outer wall of the L-shaped connector (1.1) or the U-shaped connector.

7. The push-back bed frame according to claim 6, characterized in that: The first connecting tube (6) is an outer square tube with a size larger than the second connecting tube. The second connecting tube (7) is an inner square tube that matches the inner hole of the outer square tube. The outer wall of the inner square tube is provided with a plurality of threaded holes (7.1) extending along its length direction. Adjusting bolts (8) are respectively passed through both ends of the outer square tube. The inner end of the adjusting bolt (8) can be fitted into any of the threaded holes (7.1).

8. The backrest bed frame according to any one of claims 1 to 7, characterized in that: The two sides of the fixed frame (1) are L-shaped connectors (1.1), and one end of the square tube (2.1) is rotatably connected to the vertical plate (1.1.1) of the L-shaped connector (1.1) through a hinge shaft.

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