A retractable hot air curling iron

Abstract

The utility model discloses a telescopic hot air curling iron belongs to personal care appliance field, aims at solving the single function of existing telescopic curling iron, telescopic easy to shake and jam, the problem of hot air easy broken flow. It includes fixed cylinder body, movable cylinder body, host computer and operating part. The fixed cylinder body inside is equipped with rack, and movable cylinder body inside is equipped with movable piece with rack engagement to realize axial telescopic, and the both side walls are opened with the inclined ventilation groove of intercommunication, and the first ventilation groove of movable cylinder body is longer than the second ventilation groove of fixed cylinder body, and the hot air is ensured to continue intercommunication, and the fixed cylinder body is equipped with guide rail, and is matched with the guide slot of movable cylinder body. The host computer is connected fixed cylinder body and produces hot air, and operating part is driven telescopic. The utility model integrates telescopic and hot air function, and the telescopic is stable and accurate, and the hot air output is continuous, and is safe and durable, and adapts to the demand of various hairdressing.

Description

Technical Field

[0001] This utility model relates to the field of personal care appliances, specifically to a retractable hot air curling iron. Background Technology

[0002] Curling irons, as widely used hair styling tools, primarily function to style hair through heat. Existing technologies have introduced improvements to enhance their portability and adaptability. For example, Chinese utility model patent CN205306231U discloses a telescopic curling iron. This curling iron includes an upper handle, a lower handle, and a main body containing a heating element. By retracting the main body into the handle, the overall length is shortened, improving portability. When extended for use, electricity is supplied through contact between electrode inserts and electrode springs, and a mechanical structure using a steel ring engaging a groove completes the telescopic positioning. However, analysis reveals significant drawbacks: its function is relatively simple, only achieving physical length retraction; it still relies on traditional surface heat conduction for heating and lacks hot air delivery, resulting in limited heating efficiency and uniformity; the telescopic structure design is simple, lacking an effective axial guiding mechanism, relying solely on the engagement of the steel ring and groove for positioning, which easily leads to shaking and jamming during extension and retraction, resulting in a stiff operating feel and insufficient positioning accuracy and reliability.

[0003] Furthermore, this existing technology does not consider continuous operation and focuses primarily on storage functionality, failing to address the issue of stable operation of core functions across different extension lengths. Its reliance on the electrical connection between electrode inserts and spring contacts makes it susceptible to poor contact after frequent extension and retraction operations, affecting usability. Therefore, the market urgently needs a highly adaptable curling iron that integrates portability, extension, uniform hot air output, and stable, precise operation to truly meet users' needs in diverse styling scenarios. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned defects of the prior art and provide a retractable hot air curling iron with a clever structure, smooth extension and retraction, and continuous and uniform hot air supply, so as to solve the technical problems of existing retractable curling irons having single function, poor operation feel, and inability to guarantee continuous function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A retractable hot air curling iron includes a fixed barrel, a movable barrel, a main unit, and an operating component. A rack is fixedly mounted on the inner side of the fixed barrel; a movable component that engages with the rack is fixedly mounted on the inner side of the movable barrel, allowing the movable barrel to be axially retractable to the fixed barrel via the engagement of the movable component with the rack. Ventilation structures are correspondingly and interconnected on the side walls of the fixed and movable barrels. The main unit is connected to the proximal end of the fixed barrel and is used to generate hot air. The operating component is located at the distal end of the movable barrel and allows the user to apply force to drive the movable barrel to extend or retract relative to the fixed barrel.

[0006] Furthermore, the fixed cylinder body is provided with an axial guide rail, and the movable cylinder body is provided with a first guide groove that cooperates with the guide rail.

[0007] Furthermore, the cross-section of the guide rail is one of T-shaped, dovetail-shaped, or convex. Furthermore, the ventilation structure includes a plurality of first ventilation slots formed on the side wall of the movable cylinder and a plurality of second ventilation slots formed on the side wall of the fixed cylinder and communicating with the first ventilation slots.

[0008] Furthermore, the axial length of the first ventilation groove on the movable cylinder is greater than the axial length of the second ventilation groove on the fixed cylinder, in order to ensure that the first ventilation groove and the second ventilation groove always remain overlapping and connected during the full extension and retraction stroke of the movable cylinder relative to the fixed cylinder, so as to avoid interruption of hot air flow.

[0009] Furthermore, the rack is a straight rack with locking teeth on both sides; the straight rack is also provided with a second guide groove extending along its axial direction, the second guide groove being located on other surfaces besides the surface where the locking teeth are located; the end of the second guide groove is provided with a limiting structure.

[0010] Furthermore, the movable component is a slider, which is provided with protruding teeth that mesh with the teeth of the rack, and a locking block for slidingly engaging with the second guide groove; the limiting structure is a protrusion formed at the end of the second guide groove, and the locking block is used to abut against the protrusion to limit the maximum sliding stroke of the movable component.

[0011] Furthermore, the outer surface of the operating element is provided with anti-slip texture or is made of anti-slip material.

[0012] Furthermore, the tooth pitch on the rack is set at equal intervals, and each telescopic positioning position of the movable cylinder corresponds to one tooth pitch.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. High integration and excellent synergy: This invention deeply integrates a precision rack and pinion slider telescopic mechanism with an oblique ventilation hot air system, breaking through the limitations of traditional curling irons that either only offer telescopic storage or lack hot air assistance during heating. While users adjust the length of the movable barrel using the control mechanism to suit different hair lengths or styling needs, the hot air generated by the main unit is continuously and evenly output through the always-connected ventilation structure, achieving synchronized telescopic adjustment and hot air styling. This not only meets the needs of portable storage but also significantly improves hair styling efficiency and the durability of the style.

[0014] 2. Excellent telescopic operation experience and high adjustment precision: The dual guiding design of rack and pinion slider meshing transmission and guide rail guide groove effectively avoids shaking or jamming during telescopic operation compared with traditional buckle or steel ring positioning structure, making the operation smoother and more stable. At the same time, the rack adopts an equidistant tooth pitch design, with each tooth pitch corresponding to a clear telescopic positioning position of the movable body, giving users clear adjustment feedback and achieving millimeter-level precise length control, which can flexibly adapt to different styling scenarios from short small curls to long large curls.

[0015] 3. Strong continuity of core functions and stable use: By optimizing the size of the ventilation structure, the axial length of the first ventilation slot on the movable cylinder is greater than that of the second ventilation slot on the fixed cylinder. Structurally, this ensures that the first and second ventilation slots can always remain overlapping and connected at any position of the movable cylinder throughout the entire extension stroke, avoiding hot air interruption or uneven output.

[0016] 4. Excellent safety and durability: The mechanical limiting structure, which features a second guide groove end protrusion that engages with the moving part locking block, effectively prevents damage to internal components due to excessive stretching of the moving cylinder. The outer surface of the operating part is made of non-slip soft rubber with a textured design, increasing friction when gripping and preventing slippage when operating with wet hands, further ensuring safety. At the same time, the pure mechanical meshing transmission replaces the traditional elastic electrical contact structure, reducing component wear caused by frequent extension and retraction, lowering the risk of poor contact, and significantly extending the overall service life of the product. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the retractable hot air curling iron described in this embodiment of the present invention (extended state). Figure 2 This is a three-dimensional structural diagram of the retractable hot air curling iron according to an embodiment of the present invention (in retracted state). Figure 3 This is a partial sectional view of the present invention, mainly showing the internal transmission structure.

[0018] Figure 4 This is a partial cross-sectional view of the present invention, showing the ventilation structure.

[0019] Figure 5 This is a three-dimensional structural diagram of the rack component and the movable part described in this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this should not be construed as limiting the present invention. The description of the embodiments is only used to explain the technical solution of the present invention, and not to limit the scope of protection. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example: A retractable hot air curling iron like Figures 1 to 5 As shown in the figure, this embodiment describes in detail a retractable hot air curling iron that integrates a precision telescopic mechanism and a uniform hot air output function.

[0022] The curling iron includes a fixed barrel 1, a movable barrel 2, a main unit 9, and an operating component 10. The fixed barrel 1 is made of high-temperature resistant plastic, and a metal rack 3 is fixedly installed on its inner side with screws. The movable barrel 2 is nested inside the fixed barrel 1, and a POM movable component 4 is fixedly installed on its inner side with snap-fit ​​mechanisms. This movable component 4 engages with the rack 3. Through this engagement structure, the movable barrel 2 can perform precise axial extension and retraction relative to the fixed barrel 1. Multiple interconnected ventilation structures (first ventilation slot 5 and second ventilation slot 6) are respectively formed on the side walls of the fixed barrel 1 and the movable barrel 2 to ensure that hot air is evenly distributed at any extension or retraction position. The main unit 9 is fixed to the near end of the fixed barrel 1 via a threaded connection and contains a fan and a PTC heating element for generating and delivering hot air. The operating component 10 is an ABS plastic knob with anti-slip texture, fixed to the far end of the movable barrel 2 with screws, for the user to grip and apply force to drive the extension and retraction.

[0023] Furthermore, at least two T-shaped guide rails 7 are axially arranged on the inner wall of the fixed cylinder 1. Correspondingly, a first guide groove 8 that precisely matches the guide rails 7 is formed on the inner wall of the movable cylinder 2. The cooperation between the guide rails 7 and the first guide groove 8 constitutes the main directional system. The protruding structure of the guide rails 7 and the grooved structure of the first guide groove 8 form a tight containment fit. This fit provides a solid constraint in the radial direction (i.e., in all directions perpendicular to the extension and retraction direction), effectively suppressing the radial sway that may occur in the movable cylinder 2 during the extension and retraction process, ensuring the straightness of the movement trajectory, and avoiding a loose feeling.

[0024] Furthermore, the guide rail 7 adopts a T-shaped cross-section. This structure has excellent torsional resistance, ensuring that the movable cylinder 2 maintains a stable trajectory during extension and retraction, preventing circumferential rotation and improving extension and retraction stability. When the movable cylinder 2 is subjected to torsional force, the lateral portion of the T-shaped guide rail and the corresponding bearing surface of the first guide groove will abut against each other, generating a strong resistance torque, thereby effectively preventing the movable cylinder 2 from rotating circumferentially relative to the fixed cylinder 1. This is crucial for maintaining the relative position of the ventilation slots and ensuring the stability of the user's feel during operation.

[0025] Furthermore, the ventilation structure is specifically implemented as follows: four first ventilation slots 5 are evenly opened on the side wall of the movable cylinder 2, and four second ventilation slots 6 are correspondingly opened on the side wall of the fixed cylinder 1. When the movable cylinder 2 extends or retracts, the first ventilation slots 5 always maintain at least partial overlap and communication with the second ventilation slots 6, forming a continuous hot air channel.

[0026] Furthermore, both the first ventilation slot 5 and the second ventilation slot 6 adopt an inclined slot design at a 30° angle to the axis, and all inclined slots have the same inclination angle. This design causes the hot air to generate a rotating airflow when it flows out, which evenly wraps around the body of the tube, improving the uniformity of heating the hair.

[0027] Furthermore, to ensure that the ventilation slots remain connected in any telescopic position, the axial length L5 of the first ventilation slot 5 on the movable cylinder 2 is specifically designed to be 40mm, while the axial length L6 of the second ventilation slot 6 on the fixed cylinder 1 is designed to be 25mm. This length difference design ensures that even when the movable cylinder 2 is fully extended, the first ventilation slot 5 can still overlap and connect with the second ventilation slot 6 by 15mm.

[0028] Furthermore, the rack 3 is a straight rack made of aluminum alloy, with locking teeth 31 machined on both sides with a module of 0.5. On the back of the rack 3 (the surface perpendicular to the surface where the locking teeth are located), two second guide grooves 32 with a depth of 2mm are machined. Each second guide groove 32 has a protrusion with a height of 1mm at both ends as a limiting structure 33.

[0029] Furthermore, the movable component 4 is a slider made of POM material, on which are machined protruding teeth 41 that mesh with the rack and pinion teeth 31, and two locking blocks 42 that cooperate with the second guide groove 32. When the movable cylinder 2 extends or retracts, the locking blocks 42 slide within the second guide groove 32, forming a secondary guide system. When it extends or retracts to its limit position, the locking blocks 42 abut against the limiting structure 33 (protrusion) to prevent excessive stretching.

[0030] Furthermore, the outer surface of the operating part 10 is coated with a 2mm thick TPE anti-slip soft rubber using a two-color injection molding process. The soft rubber surface is textured, which significantly enhances the friction and comfort when gripping.

[0031] Furthermore, the teeth on the rack 3 are designed with equal spacing, with a tooth pitch of 2mm. Each tooth pitch corresponds to a telescopic positioning position of the movable barrel 2, providing the user with a clear sense of the gear position and precise length adjustment. When the user grips the operating component 10 and applies force, the protruding teeth 41 of the movable component 4 engage and move along the locking teeth 31 of the rack 3, driving the movable barrel 2 to extend and retract. A dual guiding system (guide rail 7 / first guide groove 8 and second guide groove 32 / locking block 42) ensures smooth movement. The hot air generated by the main unit 9 is evenly blown out through the always-connected ventilation slots to achieve heating and styling of the hair.

[0032] It should be noted that the specific dimensions, materials and process parameters mentioned in this embodiment are merely examples. Those skilled in the art can make adjustments according to actual needs, and such adjustments should all fall within the protection scope of this utility model.

Claims

1. A retractable hot air curling iron, characterized in that, include: A fixed cylinder (1) and a movable cylinder (2) are provided. A rack (3) is fixedly provided on the inner side of the fixed cylinder (1). A movable part (4) that engages with the rack (3) is fixedly provided on the inner side of the movable cylinder (2). The movable cylinder (2) can be axially telescopically connected to the fixed cylinder (1) through the engagement of the movable part (4) with the rack (3). Ventilation structures that communicate with each other are correspondingly provided on the side walls of the fixed cylinder (1) and the movable cylinder (2). The main unit (9) is connected to the near end of the fixed cylinder (1) for generating hot air; An operating component (10) is located at the far end of the movable cylinder (2) and is used by the user to apply force to drive the movable cylinder (2) to extend or retract relative to the fixed cylinder (1).

2. The retractable hot air curling iron according to claim 1, characterized in that, The fixed cylinder (1) is provided with an axial guide rail (7), and the movable cylinder (2) is provided with a first guide groove (8) that cooperates with the guide rail (7).

3. A retractable hot air curling iron according to claim 2, characterized in that, The cross-section of the guide rail (7) is one of T-shaped, dovetail-shaped, or convex.

4. A retractable hot air curling iron according to claim 1, characterized in that, The ventilation structure includes a plurality of first ventilation slots (5) opened on the side wall of the movable cylinder (2) and a plurality of second ventilation slots (6) opened on the side wall of the fixed cylinder (1) and connected to the first ventilation slots (5).

5. A retractable hot air curling iron according to claim 4, characterized in that, The axial length of the first ventilation groove (5) on the movable cylinder (2) is greater than the axial length of the second ventilation groove (6) on the fixed cylinder (1).

6. A retractable hot air curling iron according to claim 1, characterized in that, The rack (3) is a straight rack with locking teeth (31) on both sides; the straight rack is also provided with a second guide groove (32) extending along its axial direction, the second guide groove (32) is located on other surfaces other than the surface where the locking teeth (31) are located; the end of the second guide groove (32) is provided with a limiting structure (33).

7. A retractable hot air curling iron according to claim 6, characterized in that, The movable part (4) is a slider, which is provided with a protruding tooth (41) that meshes with the tooth (31) of the rack, and a locking block (42) for sliding engagement with the second guide groove (32); the limiting structure (33) is a protrusion formed at the end of the second guide groove (32), and the locking block (42) is used to abut against the protrusion to limit the maximum sliding stroke of the movable part (4).

8. A retractable hot air curling iron according to claim 1, characterized in that, The outer surface of the operating component (10) is provided with anti-slip texture or is made of anti-slip material.

9. A retractable hot air curling iron according to claim 1, characterized in that, The tooth pitch on the rack (3) is set at equal intervals, and each telescopic positioning position of the movable cylinder (2) corresponds to one tooth pitch.

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