Lap joint structure of involute tooth-shaped chain, guide rail and spur rack
By using the overlapping structure of the involute toothed chain with the guide rail and the straight toothed rack, the problem of the inability to coincide between the pitch circle of the toothed chain and the pitch circle of the sprocket in the walking wheel assembly in the massage chair is solved, thus achieving stable walking and installation stability of the massage robot.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HAOZHONGHAO HEALTH PROD
- Filing Date
- 2025-01-07
- Publication Date
- 2026-05-08
AI Technical Summary
In existing massage chairs, the pitch circle of the toothed chain and the pitch circle of the sprocket in the walking wheel assembly are often not aligned, causing the massage robot arm to get stuck and unable to move at the connection point.
The system employs an involute toothed chain with an overlapping structure of guide rails and straight racks. The toothed chain is fixedly connected to the toothed plates at both ends of the toothed chain through a toothed chain fixing component, ensuring stable installation of the toothed chain with the seat frame guide rail or backrest frame guide rail. It also ensures that the pitch circle of the sprocket in the traveling wheel assembly coincides with the pitch circle of the toothed chain, and improves installation stability by using two-point or multi-point fixing methods.
This design enables the toothed chain to bend or flatten stably when the massage chair is reclining or upright, preventing the massage robotic arm from getting stuck, ensuring smooth movement of the robotic arm, and enhancing the stability and load-bearing capacity of the installation.
Smart Images
Figure CN224207037U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of massage chair technology, specifically to an overlapping structure of an involute toothed chain with a guide rail and a straight toothed rack. Background Technology
[0002] With the continuous advancement of technology, massage chairs will be designed and functionally more advanced to better serve people's daily lives. Massage chairs have evolved from the initial sitting function to the backrest function, and then to the "zero gravity" reclining function. The development of massage chairs that can be laid flat like a bed is to provide a more comfortable and personalized massage experience, that is, to achieve the effect of "extreme relaxation" on the massage chair.
[0003] The toothed chain used in this type of massage chair is generally directly hinged to the straight teeth of the seat frame guide rail or backrest frame guide rail via a pin. However, this method can easily cause the pitch circle of the toothed chain and the pitch circle of the sprocket in the walking wheel to not coincide when the massage chair is reclined or upright. This can easily cause the massage robot arm to get stuck and unable to move when passing through the connection section between the two. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide an overlapping structure that can ensure the pitch circle of the toothed chain coincides with the pitch circle of the sprocket in the traveling wheel assembly, as well as the axial tooth position coincides, in order to address the shortcomings of the prior art.
[0005] To achieve the above objectives, the following technical solution is adopted: an overlapping structure of an involute toothed chain with guide rails and straight toothed racks, including a backrest frame, a seat frame, and a robot arm. The backrest frame is mounted on the seat frame, and backrest frame guide rails are provided on both sides of the backrest frame. The seat frame has two first toothed racks on its backrest frame guide rails and two second toothed racks on its seat frame guide rails. A toothed chain connects the first and second toothed racks. The robot arm can move by engaging with the first toothed racks, the toothed chain, or the second toothed racks via a walking wheel assembly. The toothed chain includes several... The toothed chain plates at both ends of the toothed chain are fixedly connected to the seat frame guide rail and the backrest frame guide rail respectively via toothed chain fasteners. The toothed chain fasteners include a base plate and baffles on both sides of the base plate. The base plate is fixedly connected to the bottom surface of the seat frame guide rail or the backrest frame guide rail. The baffles extend from between the two first racks or the two second racks and are fixedly connected to the toothed chain plates at at least two points. The sprocket in the middle of the traveling wheel assembly is aligned with the axial tooth profile of the toothed chain. The spur gears on both sides of the traveling wheel assembly are aligned with the axial tooth profile of the first rack or the second rack.
[0006] Using the above technical solution, the baffle on the toothed chain fixing component is fixed at two points to the two toothed pins on the chain tooth plates at both ends of the toothed chain. The toothed chain fixing component is first welded to the bottom of the seat frame guide rail or backrest frame guide rail using an ultrasonic welding machine. Then, the baffle extends from the bottom of the seat frame guide rail or backrest frame guide rail to between the two first racks or two second racks. The pins can directly fix the chain tooth plates and the toothed chain. Since the chain tooth plates are already fixed to the bottom of the seat frame guide rail or backrest frame guide rail, the installation is faster. Alternatively, the pins can first pass through the first rack or second rack, then through the baffle, and finally be hinged at two points to the chain tooth plates on the toothed chain. This installation is more stable. Both installation methods of the toothed chain fixing component can provide a certain support force to the beginning and end of the toothed chain. When the toothed chain is wider, the baffle and the toothed plate can be fixed at three or four points to achieve stronger support and make the toothed chain more load-bearing. Two-point fixing makes installation more convenient and faster. When the backrest is reclined or erected, the toothed chain will bend or flatten accordingly. At this time, the massage robot still needs to move up and down through the walking wheel assembly. The toothed chain fixing component will prevent the pitch circle of the toothed chain from not coinciding with the pitch circle of the chain gear in the middle of the walking wheel assembly. The pitch circle of the first or second rack will also not not coinciding with the pitch circle of the spur gear on both sides of the walking wheel assembly. Therefore, there will be no jamming when transitioning from the first rack to the toothed chain and from the toothed chain to the second rack. The robot is not easy to get stuck, and the structure is reasonable.
[0007] A connection structure for an involute toothed chain with a guide rail and a straight toothed rack can be further configured as follows: each of the chain tooth plates has two first toothed portions at its head and tail, wherein the first toothed portions of two adjacent chain tooth plates along the length of the toothed chain are staggered and hinged together, each of the first toothed portions has a first pin hole, and the chain tooth plates are hinged together through the first pin holes. The top of the baffle has two second toothed portions with the same shape as the first toothed portions, and the second toothed portions have second pin holes, which are respectively engaged with the first pin holes on the chain tooth plates at both ends of the toothed chain to achieve a fixed connection. The bottom plate has welding plates at both ends, and the welding plates are welded and fixed to the bottom of the seat frame guide rail or the backrest frame guide rail.
[0008] Using the above technical solution, the first pin holes on the two first toothed parts and the second pin holes on the two second toothed parts at both ends of the baffle and toothed chain are limited by pins, so that the toothed chain is always fixed at two points with the chain tooth plates at the beginning and end when bent or flat. When fixed at two points, the toothed chain fastener is quick-installation type, and the toothed chain fastener does not need to be connected to the first or second rack, which can bear a lighter weight and is easy to install. When fixed at three or four points, the toothed chain fastener is heavy-duty and needs to be connected to the first or second rack, so it can bear a heavier weight. Neither of the above two installation methods will cause misalignment, which will prevent the massage robot from moving. By using a welding plate, the contact surface can be increased when the base plate is welded to the bottom of the seat frame guide rail or backrest frame guide rail, so that the welding is more firm and the connection stability of the toothed chain fastener is increased.
[0009] An overlapping structure of an involute toothed chain with a guide rail and a spur rack can be further configured such that the spur gear in the walking wheel assembly is an integer multiple of the number of teeth of the chain gear, and the welding plate can be configured as a set and respectively set on the front and rear sides of the base plate where the baffle is set.
[0010] When the spur gear in the walking wheel assembly is an integer multiple of the number of teeth of the chain gear, the toothed chain fastener is a quick-release type, and the cross-sectional shape of the toothed chain fastener is U-shaped. The front and rear sides of the baffle on the base plate are the front and rear sides of the U-shaped cross-section, which can increase the welding area of the base plate and make the welding more secure.
[0011] An overlapping structure of an involute toothed chain with a guide rail and a spur rack can be further configured such that the spur gear and the chain gear in the traveling wheel assembly have the same number of teeth, and the second toothed portion at the top of the baffle can be configured as three, wherein two second toothed portions are arranged adjacently to form a load-bearing portion, and the other second toothed portion is staggered from the load-bearing portion to form a connecting portion.
[0012] Using the above technical solution, when there are three second toothed sections, the toothed chain fixing component is heavy-duty type, and the spur gear and chain gear in the walking wheel assembly have the same number of teeth. Two second toothed sections are arranged adjacently and connected to the two first pin holes of the chain tooth plates at the beginning and end to form a load-bearing section. The other second toothed section is connected to the other end of the chain tooth plate connected to the chain tooth plates at the beginning and end through a pin shaft to form a connecting section. In this way, the baffle can connect two chain tooth plates, and the load-bearing section and the connecting section can also be connected to the first rack and the second rack through pin shafts to bear a greater weight.
[0013] An overlapping structure of an involute toothed chain with a guide rail and a straight toothed rack can be further configured such that: the welding plate can be configured as two sets and respectively located on the bottom sides of the load-bearing part of the base plate and the bottom sides of the connecting part of the base plate.
[0014] Using the above technical solution, the toothed chain fastener is a heavy-duty component. The welding plates are respectively set on the bottom side of the load-bearing part and on the bottom side of the connecting part. The welding plate position of the heavy-duty toothed chain fastener is perpendicular to the welding plate position of the quick-release toothed chain fastener. Since the bottom plate of the heavy-duty toothed chain fastener is longer, welding with 4 welding plates is a more stable choice.
[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description
[0016] Figure 1 This is a perspective view of an embodiment of the present utility model.
[0017] Figure 2 This is an embodiment of the present utility model. Figure 1 A schematic diagram of the connection structure of the backrest guide rail, seat guide rail, and toothed chain.
[0018] Figure 3 This is an embodiment of the present utility model. Figure 2 Enlarged view of part A.
[0019] Figure 4 This is an embodiment of the present utility model. Figure 3 A schematic diagram of the structure of the middle chain tooth plate.
[0020] Figure 5 This is an embodiment of the present utility model. Figure 3 A schematic diagram of the structure of the toothed chain fastener.
[0021] Figure 6 This is an embodiment of the present utility model. Figure 2 A schematic diagram of the back structure.
[0022] Figure 7 This is an embodiment of the present utility model. Figure 6 Enlarged view of part B in the image.
[0023] Figure 8 This is a schematic diagram of the connection structure of the backrest frame guide rail, seat frame guide rail, and toothed chain in an embodiment of this utility model. Figure 2 .
[0024] Figure 9 This is an embodiment of the present utility model. Figure 8 Enlarged view of section C in the image.
[0025] Figure 10 This is an embodiment of the present utility model. Figure 9 A schematic diagram of the structure of the toothed chain fastener.
[0026] In the diagram: 1. Backrest frame; 2. Seat frame; 3. Toothed chain; 4. Robotic arm; 5. Walking wheel assembly; 10. Backrest frame guide rail; 20. Seat frame guide rail; 11. First rack; 20. Seat frame guide rail; 21. Second rack; 31. Chain tooth plate; 32. Toothed chain fixing component; 311. First toothed part; 312. First pin hole; 313. Second toothed part; 314. Second pin hole; 321. Base plate; 322. Baffle; 323. Welding plate. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Example 1: As Figures 1-7The diagram illustrates an overlapping structure of an involute toothed chain with guide rails and straight racks, comprising a backrest frame 1, a seat frame 2, and a robotic arm 4. The backrest frame 1 is mounted on the seat frame 2. Backrest frame guide rails 10 are provided on both sides of the backrest frame 1, and seat frame guide rails 20 are provided on both sides of the seat frame 2. Two first racks 11 are provided on the backrest frame guide rails 10, and two second racks 21 are provided on the seat frame guide rails 20. A toothed chain 3 connects the first racks 11 and the second racks 21. The robotic arm 3 can move by engaging with the first racks 11, the toothed chain 33, or the second racks 21 via a walking wheel assembly 5. The toothed chain 3 includes several... The toothed plates 31 at both ends of the toothed chain 3 are fixedly connected to the seat frame guide rail 20 and the backrest frame guide rail 10 via toothed chain fasteners 32. Each toothed chain fastener 32 includes a base plate 321 and two baffles 322 located on both sides of the base plate 321. The base plate 321 is fixedly connected to the bottom surface of the seat frame guide rail 20 or the backrest frame guide rail 10. The baffles 322 extend from between the two first racks 11 or the two second racks 21 and are fixedly connected at two points to the toothed plates 31 at both ends of the toothed chain 3. The sprocket in the middle of the traveling wheel assembly 5 is aligned with the axial tooth profile of the toothed chain 3. The spur gears on both sides are axially aligned with the first rack 11 or the second rack 21. Each chain tooth plate 31 has two first toothed portions 311 at its head and tail. The first toothed portions 311 of adjacent chain tooth plates 31 along the length of the chain 3 are staggered and hinged together. Each first toothed portion 311 has a first pin hole 312. The chain tooth plates 31 are hinged together through the first pin holes 312. The top of the baffle 322 has two second toothed portions 313 with the same shape as the first toothed portions 311. The second toothed portions 313 have second pin holes 314. The baffle 322 and the first toothed chain 3... The chain tooth plates 31 at both ends of the tail are axially aligned by the cooperation of the second pin hole 314 and the first pin hole 312. The bottom plate 321 is provided with welding plates 323 at both ends. The welding plates 323 are welded and fixed to the bottom of the seat frame guide rail 20 or the backrest frame guide rail 10. The welding plates 323 can be set as a group and respectively set on the front and rear sides of the bottom plate 321 where the baffle 322 is set. When the spur gear in the walking wheel assembly 5 is an integer multiple of the number of chain gear teeth, the toothed chain fixing member 32 in this embodiment is a quick-install toothed chain fixing member 32, which does not need to be connected to the first rack or the second rack. It is simple to install and can make the tooth axially aligned and aligned.
[0029] Example 2: As Figures 1-10The diagram illustrates an overlapping structure of an involute toothed chain with guide rails and a straight rack, comprising a backrest frame 1, a seat frame 2, and a robotic arm 4. The backrest frame 1 is mounted on the seat frame 2. Backrest frame guide rails 10 are provided on both sides of the backrest frame 1, and seat frame guide rails 20 are provided on both sides of the seat frame 2. Two first racks 11 are provided on the backrest frame guide rails 10, and two second racks 21 are provided on the seat frame guide rails 20. A toothed chain 3 connects the first racks 11 and the second racks 21. The robotic arm 3 can interact with the first racks via a wheel assembly 5. The toothed chain 31 or the second rack 21 meshes and moves. The toothed chain 3 includes several toothed plates 31. The toothed plates 31 at both ends of the toothed chain 3 are fixedly connected to the seat frame guide rail 20 and the backrest frame guide rail 10 through toothed chain fixing members 32. The toothed chain fixing member 32 includes a base plate 321 and two baffles 322 provided on both sides of the base plate 321. The base plate 321 is fixedly connected to the bottom surface of the seat frame guide rail 20 or the backrest frame guide rail 10. The baffles 322 are located between the two first racks 11 or the two second racks 21. The chain gear in the middle of the traveling wheel assembly 5 is aligned with the axial tooth profile of the chain 3. The spur gears on both sides of the traveling wheel assembly 5 are aligned with the axial tooth profile of the first rack 11 or the second rack 21. Each chain gear 31 has two first toothed portions 311 at its head and tail. The first toothed portions 311 of two adjacent chain gear 31s along the length of the chain 3 are staggered and hinged together. Each first toothed portion 311 has a first pin hole 31. 2. The chain tooth plates 31 are hinged to each other through the first pin holes 312. The top of the baffle 322 is provided with two second toothed portions 313 that have the same shape as the first toothed portion 311. The second toothed portions 313 are provided with second pin holes 314. The baffle 322 and the chain tooth plates 31 at both ends of the toothed chain 3 achieve axial tooth overlap through the cooperation of the second pin holes 314 and the first pin holes 312. The bottom plate 321 is provided with welding plates 323 at both ends. The welding plates 323 are welded and fixed to the bottom of the seat frame guide rail 20 or the backrest frame guide rail 10, such as... Figures 8-10 As shown, the spur gear and chain gear in the walking wheel assembly 5 have the same number of teeth. The second toothed portion 313 at the top of the baffle 322 can be set to 3, of which two second toothed portions 313 are arranged adjacently to form a load-bearing portion 315, and the other second toothed portion 31 is staggered from the load-bearing portion 315 to form a connecting portion 316. The load-bearing portion and the connecting portion are fixedly embedded in the inner wall of the two first racks 11 or the two second racks 21. The toothed chain fixing member 32 in this embodiment is a heavy-duty toothed chain fixing member 32, which needs to be connected to the first rack 11 or the second rack 21, so the installation is stable and can bear greater weight, and will not cause the teeth to fail to axially coincide and align.
[0030] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A splicing structure of an involute toothed chain with guide rails and straight racks, comprising a backrest frame (1), a seat frame (2), and a robot (4), wherein the backrest frame (1) is mounted on the seat frame (2), the backrest frame (1) is provided with backrest frame guide rails (10) on both sides, the seat frame (2) is provided with seat frame guide rails (20) on both sides, the backrest frame guide rails (10) are provided with two first racks (11), the seat frame guide rails (20) are provided with two second racks (21), a toothed chain (3) is connected between the first racks (11) and the second racks (21), and the robot (4) can move by meshing with the first racks (11), the toothed chain (3), or the second racks (21) through a walking wheel assembly (5), wherein the toothed chain (3) comprises a plurality of chain tooth plates (31), characterized in that: The toothed plates (31) at both ends of the toothed chain (3) are fixedly connected to the seat frame guide rail (20) and the backrest frame guide rail (10) respectively through the toothed chain (3) fixing member (32). The toothed chain fixing member (32) includes a base plate (321) and baffles (322) on both sides of the base plate (321). The base plate (321) is fixedly connected to the bottom surface of the seat frame guide rail (20) or the backrest frame guide rail (10). The baffles (322) extend from between the two first racks (11) or the two second racks (21) and are fixedly connected to the toothed plates (31) at both ends of the toothed chain (3) at at least two points. The sprocket in the middle of the walking wheel assembly (5) is aligned with the axial tooth profile of the toothed chain (3). The spur gears on both sides of the walking wheel assembly (5) are aligned with the axial tooth profile of the first rack (11) or the second rack (21).
2. The overlapping structure of an involute toothed chain with a guide rail and a straight toothed rack according to claim 1, characterized in that: Each of the chain tooth plates (31) has two first toothed portions (311) at its head and tail. The first toothed portions (311) at the head and tail of two adjacent chain tooth plates (31) along the length of the chain tooth (3) are staggered and hinged together. Each first toothed portion (311) has a first pin hole (312). The chain tooth plates (31) are hinged together through the first pin hole (312). The top of the baffle (322) has two second toothed portions (313) with the same shape as the first toothed portions (311). The second toothed portions (313) have second pin holes (314). The second pin holes (314) are fixedly connected to the first pin holes (312) on the chain tooth plates (31) at both ends of the chain tooth (3). The bottom plate (321) has welding plates (323) at both ends. The welding plates (323) are welded and fixed to the bottom of the seat frame guide rail (20) or the backrest frame guide rail (10).
3. The overlapping structure of an involute toothed chain with a guide rail and a straight toothed rack according to claim 2, characterized in that: The spur gear in the walking wheel assembly (5) is an integer multiple of the number of teeth of the chain gear (54), and the welding plate (323) can be set as one set and respectively set on the front and rear sides of the baffle (322) on the base plate (321).
4. The overlapping structure of an involute toothed chain with a guide rail and a straight toothed rack according to claim 2, characterized in that: The spur gear and chain gear in the walking wheel assembly (5) have the same number of teeth. The second toothed part (313) at the top of the baffle (322) can be set to 3. Two of the second toothed parts (313) are arranged adjacently to form a load-bearing part (315), and the other second toothed part (313) is staggered from the load-bearing part (315) to form a connecting part (316). The load-bearing part (315) and the connecting part (316) are fixedly embedded in the inner wall of the two first racks (11) or the two second racks (21).
5. The overlapping structure of an involute toothed chain with a guide rail and a straight toothed rack according to claim 4, characterized in that: The welding plate (323) can be configured as two sets and respectively located on the bottom sides of the load-bearing part (315) of the base plate (321) and the bottom sides of the connecting part (316) of the base plate (321).