A swing bar mechanism for an electric bed

Abstract

A swing rod mechanism for an electric bed, the electric bed comprising a bed body, a bed frame reversibly arranged on the bed body, and a turnover mechanism connected to and driving the turnover of the bed frame, the swing rod mechanism being arranged between the bed body and the bed frame and comprising a swing rod arranged between the bed body and the bed frame, and a silent rotating wheel rotatably arranged in the swing rod and connected to the turnover mechanism, the silent rotating wheel comprising a connecting shaft arranged in the swing rod, a plastic connecting sleeve sleeved on the outer periphery of the connecting shaft, a rotating wheel body rotatably arranged on the outer periphery of the plastic connecting sleeve and connected to the turnover mechanism, a positioning sleeve arranged between the outer peripheral surface of the connecting shaft and the inner peripheral surface of the plastic connecting sleeve, and a fastener fixing the connecting shaft to the swing rod; the application limits the structure of the silent rotating wheel, and the plastic connecting sleeve for mounting the rotating wheel body is sleeved on the outer periphery of the connecting shaft, so that the rotating wheel body rotates around the plastic connecting sleeve under the driving of the steel wire rope, the friction coefficient between the rotating wheel body and the plastic connecting sleeve is reduced, and the noise is reduced, achieving the effect of silence.

Description

Technical Field

[0001] This utility model belongs to the technical field of electric bed accessories, specifically relating to a swing arm mechanism for an electric bed. Background Technology

[0002] As people's living standards gradually improve, their attention to sleep quality is increasing. Consequently, electric beds driven by mechanisms such as electric motors have developed rapidly. With technological advancements and improved living standards, people's requirements for beds are no longer limited to simply lying down; they also include various uses such as therapy and relaxation. Therefore, to meet users' diverse needs for beds in different scenarios, there is a need for beds with more intelligent structural designs to ensure user comfort in various situations.

[0003] Chinese patent document CN220898331U discloses an electric bed with a concealed steel wire rope drive structure. The bed includes a bed frame, a bed board that can be flipped on the bed frame, and a flipping mechanism on the bed frame that drives the bed board to flip. The flipping mechanism includes a rotating link, a steel wire rope, and a reversing assembly. The rotating link is rotatably mounted in the bed frame along the rotation direction of the bed board, and its top surface contacts the bed board to push the bed board to rotate. One end of the steel wire rope is located in a transverse tube and connected to the rotating link to drive its rotation; the other end extends through the transverse tube to a longitudinal tube and is connected to a drive device located therein, which can drive the steel wire rope to extend and retract, thereby driving the rotating link to rotate. The reversing assembly is located at the connection between the transverse and longitudinal tubes, and the steel wire rope is mounted on the reversing assembly to transmit driving force. The rotating link includes a roller, and one end of the steel wire rope passes around the roller and connects to the rotating link. When the steel wire rope extends and retracts, it drives the roller to rotate, generating significant noise, which is uncomfortable for the user, affecting not only the user experience but also their mood, and hindering the product's market competitiveness. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a swing arm mechanism for an electric bed.

[0005] The present invention adopts the following technical solution: A rocker arm mechanism for an electric bed, the electric bed including a bed body, a bed frame rotatably mounted on the bed body, and a flipping mechanism connected to and driving the bed frame to flip. The rocker arm mechanism is disposed between the bed body and the bed frame, including a rocker arm disposed between the bed body and the bed frame and a silent rotating wheel rotatably disposed in the rocker arm and connected to the flipping mechanism. The silent rotating wheel includes a connecting shaft disposed in the rocker arm, a plastic connecting sleeve sleeved around the outer periphery of the connecting shaft, a rotating wheel body rotatably disposed around the outer periphery of the plastic connecting sleeve and connected to the flipping mechanism, a positioning sleeve disposed between the outer peripheral surface of the connecting shaft and the inner peripheral surface of the plastic connecting sleeve, and a fastener for fixing the connecting shaft to the rocker arm. The positioning sleeve includes a positioning sleeve body and a plurality of first positioning rings spaced apart around the outer periphery of the positioning sleeve. When the fastener fixes the connecting shaft, the first positioning rings are compressed and deformed, embedding into the inner peripheral surface of the plastic connecting sleeve, thereby fixing the plastic connecting sleeve.

[0006] Furthermore, the first positioning ring includes a plurality of first outer positioning parts connected sequentially along the extension direction of the positioning sleeve body. The first outer positioning parts are pointed and can be embedded into the inner circumferential surface of the plastic connecting sleeve.

[0007] Furthermore, the first positioning ring also includes a first inner positioning part disposed on the inner peripheral surface of the positioning sleeve and opposite to a plurality of first outer positioning parts. The first inner positioning part is pointed and its front end abuts against the outer peripheral surface of the connecting shaft.

[0008] Furthermore, the swing arm is provided with a rotating cavity for the silent rotating wheel to rotate, and the plastic connecting sleeve includes two symmetrically arranged connecting sleeves, one end of the connecting sleeve abuts against the inner wall of the opposite rotating cavity, and the other end abuts against the end of the other connecting sleeve.

[0009] Furthermore, the connecting sleeve includes a limiting section that abuts against the inner wall of the rotating cavity and a mounting section for mounting the rotating wheel. The outer diameter of the mounting section is smaller than the outer diameter of the limiting section, and the rotating wheel is mounted on the outer periphery of the two mounting sections.

[0010] Furthermore, the fastener includes a connecting thread section disposed on the outer circumferential surface of the connecting shaft, a washer sleeved on the outer circumference of the connecting shaft and abutting against the outer wall of the rocker arm, and a fastening nut that cooperates with the connecting thread section to fix the connecting shaft.

[0011] Furthermore, the plastic connecting sleeve is a POM plastic connecting sleeve.

[0012] Furthermore, the rocker arm has a connecting hole through which the connecting shaft passes, and the positioning sleeve also includes two second positioning rings disposed opposite to each other on both sides of the plurality of first positioning rings. The second positioning ring includes a second outer positioning part disposed on its outer periphery that can abut against the inner wall of the connecting hole.

[0013] Furthermore, it also includes a sliding assembly disposed at the upper end of the swing arm and in sliding contact with the bed frame. The sliding assembly includes a mounting shaft disposed at the upper end of the swing arm, a mounting sleeve sleeved around the outer periphery of the mounting shaft, and a sliding wheel disposed around the outer periphery of the mounting sleeve. A sliding groove for the sliding wheel to slide is formed at the bottom of the bed frame.

[0014] Furthermore, it also includes a rotating assembly disposed between the lower end of the swing arm and the bed frame. The rotating assembly includes a rotating rod disposed on the bed frame and movably connected to the lower end of the swing arm, and a fixing member for fixing the rotating rod to the bed frame.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are as follows: By defining the structure of the silent rotating wheel, a plastic connecting sleeve for mounting the rotating wheel body is sleeved on the outer periphery of the connecting shaft, and a positioning sleeve for fixing the plastic connecting sleeve is set between the connecting shaft and the plastic connecting sleeve to fix the plastic connecting sleeve, so that the rotating wheel body rotates around the plastic connecting sleeve under the drive of the wire rope, reducing the friction coefficient between the rotating wheel body and the plastic connecting sleeve, thereby reducing noise and achieving the effect of silence; and further defining the structure of the positioning sleeve, multiple first positioning rings are set on the outer periphery of the positioning sleeve. When the fastener fixes the connecting shaft, the positioning sleeve is squeezed inward, so that the multiple first positioning rings expand outward and embed into the inner wall of the plastic connecting sleeve to fix the plastic connecting sleeve and prevent it from rotating with the rotating wheel body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an electric bed; Figure 2 This is a schematic diagram of the rocker arm mechanism; Figure 3 This is a schematic diagram showing the state of the positioning sleeve when the fastener is not tightened. Figure 4 A schematic diagram of the positioning sleeve when the fastener is locked; Figure 5 Schematic diagram of the positioning sleeve Figure 1 ; Figure 6 Schematic diagram of the positioning sleeve Figure 2 ; In the diagram, 1. rocker arm; 2. silent rotating wheel; 3. sliding assembly; 4. rotating assembly; 5. bed frame; 6. bed frame; 7. flipping mechanism; 11. connecting hole; 12. rotating cavity; 21. connecting shaft; 211. limiting shaft head; 22. plastic connecting sleeve; 221. connecting sleeve body; 222. limiting section; 223. mounting section; 23. rotating wheel body; 231. limiting groove; 24. positioning sleeve; 241. positioning sleeve body; 242. first positioning ring; 243. first outer positioning part; 244. first inner positioning part; 245. second outer positioning part; 25. fastener; 251. threaded section; 252. washer; 253. fastening nut; 31. mounting shaft; 32. sliding wheel; 41. rotating rod; 42. fixing part; 61. sliding groove; 71. wire rope. Detailed Implementation

[0017] The present invention will be further described below through specific embodiments.

[0018] Reference Figures 1 to 6 As shown, a rocker arm mechanism for an electric bed includes a rocker arm 1, a silent rotating wheel 2, a sliding assembly 3, and a rotating assembly 4. Specifically, the electric bed includes a bed body 5, a bed frame 6 that can be flipped and mounted on the bed body 5, and a flipping mechanism 7 mounted on the bed body 5 and connected to and driving the bed frame 6 to flip. The rocker arm 1 is positioned between the bed body 5 and the bed frame 6, the sliding assembly 3 is positioned at the upper end of the rocker arm 1 and slides in contact with the bed frame 6, and the rotating assembly 4 is positioned between the lower end of the rocker arm 1 and the bed body 5. Further, the flipping mechanism 7 includes a steel wire rope 71 that is movably connected to the silent rotating wheel 2. Its specific arrangement is as disclosed in the applicant's application CN220898331U, and its specific structure and working principle will not be further described here.

[0019] The silent rotating wheel 2 includes a connecting shaft 21 disposed in the rocker arm 1, a plastic connecting sleeve 22 sleeved on the outer periphery of the connecting shaft 21, a rotating wheel body 23 rotatably disposed on the outer periphery of the plastic connecting sleeve 22 and connected to the flipping mechanism 7, a positioning sleeve 24 disposed between the outer peripheral surface of the connecting shaft 21 and the inner peripheral surface of the plastic connecting sleeve 22, and a fastener 25 fixing the connecting shaft 21 to the rocker arm 1. The rocker arm 1 has a connecting hole 11 through which the connecting shaft 21 passes, and a rotating cavity 12 for the silent rotating wheel 2 to rotate. Specifically, the front end of the connecting shaft 21 has a limiting shaft head 211 that abuts against the outer wall of the rocker arm 1, and the positioning sleeve 24 is located between the limiting shaft head 211 and the fastener 25. The rotating wheel body 23 is made of metal material, and its outer peripheral surface has a limiting groove 231 for the steel wire rope 71 to pass through.

[0020] The plastic connecting sleeve 22 includes two connecting sleeve bodies 221 symmetrically arranged on the connecting shaft 21. One end of the connecting sleeve body 221 abuts against the inner wall of the rotating cavity 12, and the other end abuts against the end of another connecting sleeve body. Specifically, the connecting sleeve body 221 includes a limiting section 222 that abuts against the inner wall of the rotating cavity 12 and an installation section 223 for mounting the rotating wheel 23. The outer diameter of the installation section 223 is smaller than the outer diameter of the limiting section 222. The rotating wheel 23 is installed on the outer periphery of the two installation sections 223 and is limited between the two limiting sections 222. By limiting the structure of the plastic connecting sleeve 22, it is convenient to install and remove the silent rotating wheel 2 on the rocker arm 1. Furthermore, the plastic connecting sleeve 22 is a POM plastic connecting sleeve. The POM plastic connecting sleeve is made of polyoxymethylene (POM), which allows the plastic connecting sleeve 22 to have good mechanical strength and rigidity while reducing the coefficient of friction between it and the rotating wheel 23 made of metal material, thereby reducing noise and achieving a silent effect.

[0021] The positioning sleeve 24, made of metal, includes a positioning sleeve body 241, a plurality of first positioning rings 242 spaced apart on the outer periphery of the positioning sleeve body 241, and two second positioning rings disposed opposite to each other on both sides of the plurality of first positioning rings 242. When the fastener 25 fixes the connecting shaft 21, the first positioning rings 242 can be embedded into the inner circumferential surface of the plastic connecting sleeve 22 to fix the plastic connecting sleeve 22, so that the rotating wheel 23 can rotate around the plastic connecting sleeve 22 following the steel wire rope 71. Specifically, the first positioning rings 242 include a plurality of rings connected sequentially along the extending direction of the positioning sleeve body 241. A first outer positioning part 243 and a first inner positioning part 244 disposed on the inner circumferential surface of the positioning sleeve 241 opposite to the first outer positioning parts 243; the second positioning ring includes a second outer positioning part 245 disposed on the outer circumference of the positioning sleeve 241 that can abut against the inner wall of the connecting hole 11; wherein, the first outer positioning part 243 is pointed and can be embedded in the inner circumferential surface of the plastic connecting sleeve 22; the first inner positioning part 244 is pointed and its front end abuts against the outer circumferential surface of the connecting shaft 21; the second outer positioning part 245 is pointed and its front end abuts against the inner wall of the connecting hole 11.

[0022] Fastener 25 includes a threaded section 251 on the outer periphery of the connecting shaft 21, a washer 252 sleeved on the outer periphery of the connecting shaft 21 and abutting against the outer wall of the rocker arm 1, and a fastening nut 253 that cooperates with the threaded section 251 to fix the connecting shaft 21. When the connecting shaft 21 is fixed, the fastening nut 253 rotates inward to gradually press the end of the positioning sleeve 24, and finally abuts against the washer 252 to fix the connecting shaft 21. At this time, the positioning sleeve 24 will deform due to the compression of the fastening nut 253, causing the first outer positioning part 243 to expand outward and enter into the inner wall of the plastic connecting sleeve 22 to fix the plastic connecting sleeve 22. At the same time, the first inner positioning part 244 expands inward and abuts against the outer wall of the connecting shaft 21 to fix the connecting shaft 21. The second outer positioning part 245 will also expand outward and abut against the inner wall of the connecting hole 11 to further fix the connecting shaft 21.

[0023] The sliding assembly 3 includes a mounting shaft 31 disposed at the upper end of the rocker arm 1, a mounting sleeve sleeved around the outer periphery of the mounting shaft 31, and a sliding wheel 32 disposed around the outer periphery of the mounting sleeve. The bottom of the bed frame 6 has a sliding groove 61 for the sliding wheel 32 to slide.

[0024] The rotating assembly 4 includes a rotating rod 41 mounted on the bed 5 and movably connected to the lower end of the swing arm 1, and a fixing member 42 that fixes the rotating rod 41 to the bed 5. Specifically, the fixing member 42 is set in the same way as the fastener 25, and its specific structure will not be described in detail here.

[0025] This application defines the structure of the silent rotating wheel 2 by fitting a plastic connecting sleeve 22 for mounting the rotating wheel body 23 around the outer periphery of the connecting shaft 21, and setting a positioning sleeve 24 between the connecting shaft 21 and the plastic connecting sleeve 22 to fix the plastic connecting sleeve 22. This fixes the plastic connecting sleeve 22, allowing the rotating wheel body 23 to rotate around the plastic connecting sleeve 22 under the drive of the wire rope 71, reducing the coefficient of friction between the rotating wheel body 23 and the plastic connecting sleeve 22, thereby reducing noise and achieving a silent effect. Furthermore, the structure of the positioning sleeve 24 is defined by setting multiple first positioning rings 242 around the outer periphery of the positioning sleeve 24. When the fastener 25 fixes the connecting shaft 21, it squeezes the positioning sleeve 24 inward, causing the multiple first outer positioning parts 243 to expand outward and embed into the inner wall of the plastic connecting sleeve 22 to fix the plastic connecting sleeve 22 and prevent it from rotating with the rotating wheel body 23.

[0026] The above description is merely a preferred embodiment of the present utility model, and therefore cannot be construed as limiting the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model application and the contents of the specification should still fall within the scope of the present utility model application.

Claims

1. A swing arm mechanism for an electric bed, the electric bed comprising a bed body, a bed frame rotatably mounted on the bed body, and a flipping mechanism connected to and driving the bed frame to flip, the swing arm mechanism being disposed between the bed body and the bed frame, characterized in that: The device includes a rocker arm disposed between the bed body and the bed frame, and a silent rotating wheel rotatably disposed in the rocker arm and connected to a flipping mechanism. The silent rotating wheel includes a connecting shaft disposed in the rocker arm, a plastic connecting sleeve sleeved around the outer periphery of the connecting shaft, a rotating wheel body rotatably disposed around the outer periphery of the plastic connecting sleeve and connected to the flipping mechanism, a positioning sleeve disposed between the outer peripheral surface of the connecting shaft and the inner peripheral surface of the plastic connecting sleeve, and a fastener for fixing the connecting shaft to the rocker arm. The positioning sleeve includes a positioning sleeve body and a plurality of first positioning rings spaced apart around the outer periphery of the positioning sleeve. When the fastener fixes the connecting shaft, the first positioning rings are compressed and deformed, embedding into the inner peripheral surface of the plastic connecting sleeve, thereby fixing the plastic connecting sleeve.

2. The swing arm mechanism for an electric bed according to claim 1, characterized in that: The first positioning ring includes a plurality of first outer positioning parts connected sequentially along the extension direction of the positioning sleeve. The first outer positioning parts are pointed and can be embedded in the inner circumferential surface of the plastic connecting sleeve.

3. A swing arm mechanism for an electric bed according to claim 2, characterized in that: The first positioning ring also includes a first inner positioning part disposed on the inner peripheral surface of the positioning sleeve and opposite to a plurality of first outer positioning parts. The first inner positioning part is pointed and its front end abuts against the outer peripheral surface of the connecting shaft.

4. The swing arm mechanism for an electric bed according to claim 1, characterized in that: The swing arm is provided with a rotating cavity for the silent rotating wheel to rotate. The plastic connecting sleeve includes two symmetrically arranged connecting sleeves. One end of the connecting sleeve abuts against the inner wall of the opposite rotating cavity, and the other end abuts against the end of the other connecting sleeve.

5. A swing arm mechanism for an electric bed according to claim 4, characterized in that: The connecting sleeve includes a limiting section that abuts against the inner wall of the rotating cavity and a mounting section for mounting the rotating wheel. The outer diameter of the mounting section is smaller than the outer diameter of the limiting section, and the rotating wheel is mounted on the outer periphery of the two mounting sections.

6. A swing arm mechanism for an electric bed according to claim 1, characterized in that: The fasteners include a connecting thread section disposed on the outer circumference of the connecting shaft, a washer sleeved on the outer circumference of the connecting shaft and abutting against the outer wall of the rocker arm, and a fastening nut that cooperates with the connecting thread section to fix the connecting shaft.

7. A swing arm mechanism for an electric bed according to claim 1, characterized in that: The plastic connecting sleeve is a POM plastic connecting sleeve.

8. A swing arm mechanism for an electric bed according to claim 1, characterized in that: The rocker arm has a connecting hole through which the connecting shaft passes, and the positioning sleeve also includes two second positioning rings disposed opposite to each other on both sides of the plurality of first positioning rings. The second positioning ring includes a second outer positioning part disposed on its outer periphery that can abut against the inner wall of the connecting hole.

9. A swing arm mechanism for an electric bed according to claim 1, characterized in that: It also includes a sliding assembly that is disposed at the upper end of the swing arm and slides in contact with the bed frame. The sliding assembly includes a mounting shaft disposed at the upper end of the swing arm, a mounting sleeve sleeved on the outer periphery of the mounting shaft, and a sliding wheel disposed on the outer periphery of the mounting sleeve. A sliding groove is formed at the bottom of the bed frame for the sliding wheel to slide.

10. A swing arm mechanism for an electric bed according to claim 1, characterized in that: It also includes a rotating assembly disposed between the lower end of the swing arm and the bed frame. The rotating assembly includes a rotating rod disposed on the bed frame and movably connected to the lower end of the swing arm, and a fixing member for fixing the rotating rod to the bed frame.

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