Whole chair rotating mechanism for hair washing chair and foot bath chair

Abstract

A whole chair rotating mechanism for a hair washing chair and a foot bath chair comprises a base plate, the base plate is used for fixing a whole chair, and a rotating mechanism body used for driving the base plate to rotate is arranged below the base plate. The rotating mechanism comprises rotating assemblies and a driving assembly, wherein the rotating assemblies are fixed to the base plate in the mode that the rotating assemblies are clamped to the two sides of the base plate respectively, and the driving assembly is used for driving the rotating assemblies to rotate. The driving assembly drives the rotating assemblies to rotate in a linear motion mode. The rotating assembly has the advantages that through the design of the symmetrical clamping type rotating assembly, the chassis is evenly stressed in the rotating process, and the deformation risk caused by single-side stress concentration is avoided.

Description

Technical Field

[0001] This utility model relates to a massage chair structure, and more particularly to a whole chair rotation mechanism for a shampoo chair and a foot bath chair. Background Technology

[0002] In the beauty, hairdressing, and wellness service sectors, shampoo chairs and foot bath chairs have become well-established and widely used as basic equipment. Shampoo chairs are primarily used in hair salons, featuring an adjustable reclining design. The backrest can be electrically or manually reclined to an angle of 30-150 degrees, positioning the customer's head above the shampoo tub. A recessed drainage system completes the rinsing process. Some high-end models integrate neck support and water temperature monitoring. Foot bath chairs are commonly used in foot massage parlors, featuring an upright seating design and equipped with a detachable foot bath basin and lifting mechanism. Maintaining a comfortable seat height of 45-75 cm, they use a built-in thermostat to maintain water temperature. Some models incorporate a pneumatic massage module for leg therapy. Both types of equipment require fixed water supply and drainage systems and power lines to operate.

[0003] Existing shampoo chairs and foot bath chairs generally suffer from insufficient space adaptability, with the core issue being the lack of a horizontal swivel mechanism. The fixed base structure prevents orientation adjustments after installation; in foot bath areas, the fixed orientation of the chairs often leads to overlapping personnel movement, requiring service staff to frequently maneuver around the chairs, impacting operational efficiency. Especially in narrow service spaces or irregularly shaped rooms, the non-swivel design forces the chairs to be placed in the center, wasting edge space and affecting overall aesthetics. Furthermore, users must twist their bodies to coordinate with the service, which can easily lead to muscle fatigue with prolonged use. Existing adjustable parts are mostly limited to tilt angle adjustment, failing to fundamentally improve the space adaptability deficiencies of the equipment. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a whole-chair rotation mechanism for shampoo chairs and foot bath chairs that can rotate as a whole.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a whole chair rotation mechanism for a shampoo chair and a foot bath chair, comprising a chassis for fixing the whole chair, and a rotation mechanism for driving the chassis to rotate is provided below the chassis. The rotation mechanism includes a rotating component fixed to the chassis by clamping it to both sides of the chassis and a driving component for driving the rotating component to rotate. The driving component drives the rotating component to rotate in a linear motion.

[0006] The beneficial effects of this invention are as follows: The symmetrical clamping rotating component design ensures uniform force distribution on the chassis during rotation, avoiding the risk of deformation caused by stress concentration on one side. The drive component uses a transmission method that converts linear motion into rotational motion, which, compared to traditional direct motor drive solutions, reduces the overall height of the equipment and improves the stability of torque output. As a preferred approach, the rotating component can be designed with a double-sided synchronous meshing structure, transmitting driving force simultaneously through symmetrically distributed transmission pairs on both sides. This ensures the rigidity of the transmission system and improves the reliability of the mechanism through redundant design. To address the waterproofing requirements of the foot bath chair, the mechanism can also employ a fully enclosed gearbox structure, with multiple layers of sealing rings at the connection between the gear shaft and the chassis. This meets the requirements for leak-proof operation in liquid environments without affecting the degree of rotational freedom.

[0007] Furthermore, the rotating mechanism includes a fixed bracket, and the rotating component includes a fixed shaft located at the center of the fixed bracket and the chassis. The fixed shaft is fitted with a gear shaft that is connected to the chassis and can drive the chassis to rotate together. The driving component includes a retractable rack, and the rack and the gear shaft mesh with each other and drive the gear shaft to rotate through the rack.

[0008] The nested design of the central fixed shaft and the gear shaft achieves precise positioning of the central axis of the rotating mechanism, effectively reducing radial offset errors during rotation. The meshing transmission between the gear shaft and rack ensures transmission accuracy while allowing precise control of the rotation angle by adjusting the rack stroke. As a preferred method, the fixed shaft can adopt a stepped shaft structure with an axial positioning surface at the shaft shoulder, forming a double positioning with the stepped inner hole of the gear shaft, ensuring assembly accuracy and preventing axial movement. For high-load conditions, the gear shaft tooth profile can be designed as a double-pressure-angle involute tooth profile, improving tooth root bending strength while ensuring transmission efficiency.

[0009] Furthermore, the gear shaft includes a meshing part and a fixing part. The meshing part meshes with the rack, and the fixing part extends from the end face of the meshing part to the other side of the chassis. The fixing part is provided with a ring-shaped buckle on the other side of the chassis, which extends in a ring away from the fixing shaft and is fixed to the chassis.

[0010] The annular extension design of the ring fastener creates a multi-point distributed fixation, significantly improving the connection rigidity between the gear shaft and the chassis. This structure effectively disperses the shear stress generated by rotational torque, preventing overload failure at local connection points. As a preferred option, the ring fastener can be equipped with a radial reinforcing rib structure, with the ribs distributed at equal angles along the circumference and forming a mortise and tenon connection with the chassis frame, enhancing structural strength and facilitating assembly and positioning. For chassis of different sizes, the annular extension radius of the ring fastener can be designed to be adjustable, achieving installation adaptability through multiple sets of bolt holes.

[0011] Furthermore, a rotating bearing is provided between the gear shaft and the fixed shaft, and the two ends of the rotating bearing form an interference fit with the fixed shaft and the gear shaft, respectively.

[0012] The interference fit design of the rotating bearing eliminates assembly clearances, ensuring precise transmission of rotational motion. The double-end interference fit structure creates axial restraint, effectively preventing fretting wear under alternating loads. As a preferred option, a double-row angular contact ball bearing assembly can be used, simultaneously bearing radial and axial combined loads through back-to-back mounting. For high-frequency rotational conditions, a spiral oil groove structure can be incorporated into the bearing inner ring, working in conjunction with an automatic lubrication system to achieve continuous lubrication and extend bearing life.

[0013] Furthermore, the rotating assembly also includes a first washer and a second washer that abut against the engaging part and the ring-locking part respectively. The first washer and the second washer are located on both sides of the chassis, and a fixing nut is provided on the second washer.

[0014] The dual-shield structure forms an axial clamping force balance system, effectively suppressing axial movement of the gear shaft during transmission. The split-shield design allows for independent adjustment of the preload on both sides, ensuring assembly accuracy. As a preferred option, the first shim can be designed as a disc spring washer with a tapered guide surface, providing constant preload while compensating for machining errors in the parts. The fixing nut of the second shim can integrate a torque display function, using color rings to indicate the tightening status in real time.

[0015] Furthermore, the drive assembly includes a guide rail groove fixed on a fixed bracket, and both ends of the guide rail groove are provided with anti-disengagement buckles. The rack moves within the guide rail groove and is prevented from radially deviating by the anti-disengagement buckles.

[0016] The combined design of the guide rail groove and the anti-disengagement latch ensures precise guidance of the rack's movement trajectory, guaranteeing that the meshing pairs always maintain optimal fit. The double-end anti-disengagement structure provides redundant protection, enhancing the safety of the transmission system. As a preferred option, a self-lubricating composite material layer can be installed on the inner wall of the guide rail groove, forming a solid lubricating film on the rack's sliding surface and reducing the coefficient of friction. The anti-disengagement latch can employ a flexible claw structure, providing reliable limiting functionality while allowing for assembly tolerances.

[0017] Furthermore, the drive assembly also includes a telescopic cylinder fixed to a fixed bracket, wherein one telescopic end of the telescopic cylinder is fixed to the end of the rack to drive the rack to move within the guide rail groove.

[0018] The direct drive between the telescopic cylinder and the rack simplifies the transmission chain and improves energy transfer efficiency. The modular design allows for easy replacement of drive units of different specifications to meet load requirements. As a preferred option, the telescopic cylinder can employ a double-rod hydraulic cylinder structure, achieving smooth bidirectional motion control through a symmetrical oil circuit design. Ball joints can be installed at the connection points to compensate for installation alignment errors and prevent cylinder wear caused by lateral forces.

[0019] Furthermore, the drive assembly also includes a fixing plate, a fixing pin, and a fixing pin. The fixing plate is U-shaped, and the fixing plate, the rack, and the telescopic cylinder are provided with pin holes for the fixing pin to be inserted at corresponding positions. The fixing pin is inserted into the part of the fixing pin located outside the fixing plate to prevent the fixing pin from coming out of the fixing plate, the rack, and the telescopic cylinder.

[0020] The U-shaped retaining plate and the pin combine to form a three-point connection structure, ensuring connection reliability while allowing for a certain degree of freedom. The detachable pin design facilitates quick assembly and disassembly during maintenance. As a preferred option, the retaining pin can be designed as a stepped shaft structure, with surface nitriding treatment applied to critical load-bearing sections to enhance shear strength. A spiral oil groove can be provided on the inner wall of the pin hole, working in conjunction with an grease fitting to achieve long-term lubrication and reduce pin wear. Attached Figure Description

[0021] Figure 1 This is a front view of an embodiment of the present invention in its initial state;

[0022] Figure 2 This is an isometric view of the chassis and rotating mechanism according to an embodiment of the present invention;

[0023] Figure 3 This is an isometric view of the rotating mechanism according to an embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional view of the rotating assembly according to an embodiment of the present invention;

[0025] Figure 5 This is an isometric view of the drive assembly according to an embodiment of the present invention;

[0026] Figure 6 This is a partial enlarged view of the fixing point of the rack and telescopic cylinder in an embodiment of this utility model;

[0027] Figure 7 This is a front view of an embodiment of the present invention after rotation. Detailed Implementation

[0028] This utility model embodiment provides a chair rotation mechanism for a shampoo chair and a foot bath chair, as follows: Figure 1-7As shown: The system includes a chassis 1, with a rotating mechanism 2 positioned below the chassis 1. The rotating mechanism 2 includes a fixed bracket 21, a rotating assembly 22 mounted on the fixed bracket 21, and a drive assembly 23. The rotating assembly 22 includes a fixed shaft 221 positioned at the center of the fixed bracket 21 and vertically mounted. A gear shaft 222 is sleeved on the fixed shaft 221, and the gear shaft 222 is rotatably connected to the fixed shaft 221 via a rotating bearing 223. The gear shaft 222 includes a meshing portion 2221 and a fixing portion 2222. The meshing portion 2221 has teeth machined on its outer periphery, and the fixing portion 2222 extends to form a ring-shaped part 2223 at its end. This ring-shaped part 2223 extends annularly on the end face of the chassis 1 on the other side and is fixedly connected to the chassis 1 by welding. A first washer 224 and a second washer 225 are respectively provided on both sides of the meshing portion 2221 of the gear shaft 222. A fixing nut 226 is installed on the outer side of the second washer 225.

[0029] The drive assembly 23 includes a guide rail groove 231 fixedly connected to the fixed bracket 21. A rack 232 is slidably disposed within the guide rail groove 231, and the teeth of the rack 232 precisely mesh with the meshing part 2221. Both ends of the guide rail groove 231 are provided with upwardly folded anti-disengagement latches 233, which can limit the radial displacement of the rack 232. In the assembly structure of the fixed shaft 221 and the gear shaft 222, the two ends of the rotating bearing 223 form an interference fit with the fixed shaft 221 and the gear shaft 222, respectively.

[0030] The drive assembly 23 also includes a telescopic cylinder 234 fixed on the fixed bracket 21. The piston rod 2341 of the telescopic cylinder 234 is connected to the end of the rack 232. A U-shaped fixing plate 236 is used to connect the piston rod 2341 and the rack 232. The fixing plate 236 is connected to the rack 232 and the piston rod 2341 through a fixing pin 237. A fixing pin 238 is inserted into the exposed end of the fixing pin 237.

[0031] The working principle of this embodiment is as follows: When the telescopic cylinder 234 pushes the rack 232 to move linearly, the rack 232 drives the gear shaft 222 to rotate through tooth meshing. The ring buckle 2223 of the gear shaft 222 transmits the rotational torque to the chassis 1, realizing the smooth rotation of the entire chair. The first washer 224 and the second washer 225 cooperate with the fixing nut 226 to form an axial constraint. The guide rail groove 231 and the anti-disengagement buckle 233 together ensure the linear motion trajectory of the rack 232, ensuring transmission accuracy.

[0032] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A chair rotation mechanism for a shampoo chair and a foot bath chair, comprising a chassis for fixing the entire chair, characterized in that: A rotating mechanism for driving the chassis to rotate is provided below the chassis. The rotating mechanism includes a rotating component that is fixed to the chassis by clamping it to both sides and a driving component for driving the rotating component to rotate. The driving component drives the rotating component to rotate in a linear motion.

2. The whole chair rotation mechanism for the shampoo chair and foot bath chair according to claim 1, characterized in that: The rotating mechanism includes a fixed bracket, and the rotating component includes a fixed shaft located at the center of the fixed bracket and the chassis. The fixed shaft is fitted with a gear shaft that is connected to the chassis and can drive the chassis to rotate together. The driving component includes a retractable rack, and the rack and the gear shaft mesh with each other and drive the gear shaft to rotate through the rack.

3. The whole chair rotation mechanism for shampoo chairs and foot bath chairs according to claim 2, characterized in that: The gear shaft includes a meshing part and a fixing part. The meshing part meshes with the rack. The fixing part extends from the end face of the meshing part to the other side of the chassis. The fixing part is provided with a ring-shaped buckle extending away from the fixing shaft on the other side of the chassis. The ring-shaped buckle is fixed to the chassis.

4. The whole chair rotation mechanism for the shampoo chair and foot bath chair according to claim 3, characterized in that: A rotating bearing is provided between the gear shaft and the fixed shaft, and the two ends of the rotating bearing form an interference fit with the fixed shaft and the gear shaft, respectively.

5. The whole chair rotation mechanism for the shampoo chair and foot bath chair according to claim 3, characterized in that: The rotating assembly also includes a first washer and a second washer that abut against the engaging part and the ring-locking part respectively. The first washer and the second washer are located on both sides of the chassis, and a fixing nut is provided on the second washer.

6. The whole chair rotation mechanism for shampoo chairs and foot bath chairs according to claim 5, characterized in that: The drive assembly includes a guide rail groove fixed on a fixed bracket and a rack. Both ends of the guide rail groove in the radial direction are provided with anti-disengagement buckles. The rack moves within the guide rail groove and is prevented from radially deviating by the anti-disengagement buckles.

7. The whole chair rotation mechanism for shampoo chairs and foot bath chairs according to claim 6, characterized in that: The drive assembly also includes a telescopic cylinder fixed to a fixed bracket, wherein one telescopic end of the telescopic cylinder is fixed to the end of the rack to drive the rack to move within the guide rail groove.

8. The whole chair rotation mechanism for shampoo chairs and foot bath chairs according to claim 7, characterized in that: The drive assembly also includes a fixing plate, a fixing pin, and a fixing pin. The fixing plate is U-shaped. The fixing plate, the rack, and the telescopic cylinder are provided with pin holes for the fixing pin to be inserted at corresponding positions. The fixing pin is inserted into the part of the fixing pin that is outside the fixing plate to prevent the fixing pin from coming out of the fixing plate, the rack, and the telescopic cylinder.

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