Lifting fan
The ratchet rack and pawl mechanism solves the problem of cumbersome operation for adjusting the height of existing fans, enabling convenient adjustment without continuous button pressing and one-handed operation, while enhancing the stability of the structure.
Patent Information
- Application Number
- CN202520299009.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-02-24
AI Technical Summary
The existing fan is cumbersome to operate when adjusting the height, requiring continuous pressing of the button or turning of the screw fastener, making it difficult to operate with one hand and inconvenient to use.
It adopts a ratchet and pawl combination structure, and uses elastic elements to automatically control the button and pawl, so that the height can be adjusted without pressing the button or rotating the screw fastener. Upward adjustment can be operated with one hand, while downward adjustment requires pressing the button continuously and then locking automatically.
It improves the convenience and structural stability of fan height adjustment, making it particularly suitable for usage scenarios where the height needs to be adjusted frequently. It avoids the accidental slippage problem of traditional structures and enables one-handed operation and automatic locking.
Smart Images
Figure CN223975276U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of air supply equipment, and in particular to a liftable fan. Background Technology
[0002] Existing height-adjustable fans typically mount the fan body onto a base column and secure it with screw fasteners. This height adjustment mechanism requires rotating the screw fasteners before and after adjustment, making operation cumbersome. Additionally, some adjustable fans use buttons to control the connection between the base column and the fan body, but this also requires pressing the button to adjust the fan height, meaning the adjustable fan requires continuous button pressing to raise its height, making one-handed operation difficult and inconvenient.
[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] This application provides a height-adjustable fan, which can solve the problem of how to improve the convenience of fan height adjustment in the prior art.
[0006] (II) Technical Solution
[0007] To solve the above-mentioned technical problems, this application provides the following technical solution:
[0008] A height-adjustable fan is provided, the height-adjustable fan comprising: a base, a fan body, and a height adjustment component;
[0009] The base is provided with a hollow cylindrical column, and the inner side of the cylindrical column is provided with vertically arranged ratchet racks;
[0010] The fan body is provided with a hollow sleeve rod, which is slidably sleeved with the cylindrical column, and is provided with a compression spring inside. The bottom end of the compression spring abuts against the top of the cylindrical column, and the top end supports the fan body.
[0011] The height adjustment assembly includes a button, a pawl, and an elastic element. The button is slidably disposed at the through hole in the side wall of the sleeve. The pawl is rotatably disposed inside the sleeve via a pin, with one end forming a force-bearing arm that contacts the button and the other end forming a locking arm with teeth. The elastic element is disposed inside the sleeve, and the elastic force acts on the pawl, forcing the teeth to engage with the ratchet rack in the normal state.
[0012] The ratchet rack has a tooth surface structure including a stop surface and an inclined guide surface. The inclined direction of the guide surface is set such that when the fan body is lifted by an external force, the claw teeth can slide along the guide surface and unlock step by step through the elastic rotation of the pawl; when the fan body is pressed down, the claw teeth and the stop surface of the ratchet rack form a rigid engagement; the height adjustment component is configured such that during the descent of the fan body, the button needs to be continuously pressed to keep the claw teeth disengaged from the ratchet rack; when the external force is removed, the elastic element resets to re-engage and lock the claw teeth and ratchet rack.
[0013] In some embodiments, the elastic element is a spring, a spring seat is fixedly provided inside the sleeve rod, the spring seat is provided with a receiving groove for accommodating the spring, a positioning post is provided at the bottom of the receiving groove, one end of the spring is sleeved on the positioning post, and the other end abuts against the side of the force arm away from the button.
[0014] In some embodiments, a guide rod is fixedly provided inside the sleeve rod, and the guide rod is axially provided with a guide groove. The pawl is rotatably disposed in the guide groove by means of a pin.
[0015] In some embodiments, the compression spring is sleeved outside the guide rod, and its two ends abut against the support surface at the top of the cylinder and the inner top wall of the sleeve rod, respectively.
[0016] In some embodiments, a guide sleeve is fixedly provided at the top of the cylindrical column, and the bottom end of the guide rod extends into the guide sleeve to form a sliding fit.
[0017] In some embodiments, the top of the cylinder is provided with a limiting flange, and the bottom of the sleeve is provided with a stop ring that cooperates with the limiting flange.
[0018] In some embodiments, the stop surface is a horizontal surface, and the guide surface has an inclination angle of 45°-60°.
[0019] (III) Beneficial Effects
[0020] Compared with the prior art, the beneficial effects of the technical solution provided in this application include at least the following:
[0021] The height-adjustable fan of this application enhances the convenience of bidirectional adjustment: through the cooperation of the ratchet and the pawl, the fan body can be raised in the normal state without pressing a button or rotating the screw fastener. When adjusting the height downward, simply press the button for continuous adjustment. Moreover, regardless of whether the adjustment is upward or downward, it will automatically lock after the external force is removed, making it convenient to use. At the same time, the cooperation of the ratchet and the pawl for one-way locking, combined with the automatic lifting assistance of the pressure spring, allows for one-handed operation when adjusting upward, which is particularly suitable for usage scenarios that require frequent height adjustments.
[0022] The height-adjustable fan of this application utilizes an elastic element to automatically control the button and the pawl, ensuring reliable engagement between the pawl teeth and the ratchet rack, avoiding the accidental slippage problem that is prone to occur in traditional spring structures, and thus enhancing structural stability. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a front view of the height-adjustable fan in an embodiment of this application;
[0025] Figure 2 yes Figure 1 A sectional view of section A in the middle;
[0026] Figure 3 yes Figure 2 A schematic diagram of region B in the middle;
[0027] Figure 4 yes Figure 3 A schematic diagram of region D in the middle;
[0028] Figure 5 This is a perspective view of the height adjustment component and the ratchet rack in an embodiment of this application.
[0029] Figure label:
[0030] Base 1, cylindrical column 11, ratchet rack 111, stop surface 111a, guide surface 111b, limiting flange 112, guide sleeve 12;
[0031] Fan body 2, sleeve rod 21, stop ring 211, compression spring 22, guide rod 23, guide groove 231;
[0032] Height adjustment component 3, button 31, pawl 32, force arm 321, pawl tooth 322, locking arm 323, spring 33, pin 34, spring seat 35, receiving groove 351, positioning post 352.
[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0035] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0036] Some existing adjustable fans control the fan height via buttons. Whether adjusting the fan height, the button needs to be pressed. In other words, adjusting the height of the adjustable fan requires continuously pressing the button to raise it, which is difficult to operate with one hand and is not convenient to use.
[0037] To address the aforementioned technical problems, this embodiment provides a height-adjustable fan. (See reference...) Figures 1 to 5 As shown, Figure 1 This is a front view of the height-adjustable fan in an embodiment of this application. Figure 2 yes Figure 1 Sectional view of section A in the middle. Figure 3 yes Figure 2 A schematic diagram of region B in the middle. Figure 4 yes Figure 3 A schematic diagram of region D in the middle. Figure 5 This is a perspective view of the height adjustment component and the ratchet rack in an embodiment of this application.
[0038] The height-adjustable fan includes: a base 1, a fan body 2, and a height adjustment component 3.
[0039] The base 1 is placed on the foundation. The base 1 has a hollow cylindrical column 11, and the inner side of the cylindrical column 11 has vertically arranged ratchet racks 111.
[0040] The fan body 2 is used to realize the fan function. The lower end of the fan body 2 is provided with a hollow sleeve 21. The sleeve 21 and the cylinder 11 form a sliding sleeve engagement, and a compression spring 22 is provided inside. The compression spring 22 is used to counteract the gravity of the fan body 2. Its bottom end abuts against the top of the cylinder 11, and its top end supports the fan body 2.
[0041] The height adjustment component 3 is used to adjust the height of the fan body 2. It includes a button 31, a pawl 32, and an elastic element 33. The button 31 is slidably disposed at the through hole on the side wall of the sleeve 21. The pawl 32 is rotatably disposed inside the sleeve 21 via a pin 34, and one end forms a force-bearing arm 321 that contacts the button 31, and the other end forms a locking arm 323 with claw teeth 322. The elastic element 33 is disposed inside the sleeve 21, and the elastic force acts on the pawl 32, forcing the claw teeth 322 to engage with the ratchet rack 111 in the normal state.
[0042] The ratchet rack 111 has a tooth surface structure including a stop surface 111a and an inclined guide surface 111b. The inclined direction of the guide surface 111b is set such that when the fan body 2 is lifted by an external force, the pawl 322 can slide along the guide surface 111b and unlock step by step through the elastic rotation of the pawl 32; when the fan body 2 is pressed down, the pawl 322 and the stop surface 111a of the ratchet rack 111 form a rigid engagement; the height adjustment component 3 is configured such that during the descent of the fan body 2, the button 31 needs to be continuously pressed to keep the pawl 322 disengaged from the ratchet rack 111; when the external force is removed, the elastic element 33 resets to re-engage and lock the pawl 322 and the ratchet rack 111.
[0043] The working process of the liftable fan in the above technical solution is as follows: Lifting operation: In the initial state, the user directly lifts the fan body 2 upwards. The claw 322 slides along the inclined guide surface 111b, forcing the pawl 32 to rotate around the pin 34 against the elastic force of the elastic element 33, achieving step-by-step unlocking. When the target height is reached, the elastic element 33 pushes the pawl 32 to reset, and the claw 322 forms a rigid engagement with the horizontal stop surface 111a of the next ratchet. Lowering operation: Continuously pressing the button 31 pushes the force arm 321, which in turn pushes the pawl 32 to rotate in the opposite direction, causing the claw 322 to completely disengage from the ratchet rack 111. At this time, the reset force of the compression spring 22 drives the sleeve rod 21 to slide down along the cylinder 11 until the button 31 is released. Under the action of the elastic element 33, the claw 322 forms a rigid engagement with the stop surface 111a of the current ratchet, re-engaging and locking.
[0044] The height-adjustable fan described above has the following technical advantages: It enhances the convenience of bidirectional adjustment: through the cooperation of the ratchet 111 and the pawl 32, the fan body 2 can be raised in its normal state without pressing the button 31 or rotating the screw fastener. When adjusting the height downwards, simply pressing the button 31 allows for continuous adjustment. Regardless of whether the adjustment is upwards or downwards, it automatically locks after the external force is removed, making it convenient to use. Simultaneously, the one-way locking cooperation of the ratchet 111 and the pawl 32, combined with the automatic lifting assistance of the compression spring 22, allows for one-handed operation when adjusting upwards, making it particularly suitable for applications requiring frequent height adjustments. The height-adjustable fan in the above technical solution utilizes the elastic element 33 to automatically control the button 31 and the pawl 32, ensuring reliable engagement between the pawl 322 and the ratchet 111, avoiding the accidental slippage problem easily caused by traditional spring structures, and enhancing structural stability.
[0045] For example, the elastic element 33 is a spring, such as spring 33. A spring seat 35 is fixedly provided inside the sleeve rod 21. The spring seat 35 has a receiving groove 351 for accommodating the spring. A positioning post 352 is provided at the bottom of the receiving groove 351. One end of the spring 33 is sleeved on the positioning post 352, and the other end abuts against the side of the force-bearing arm 321 opposite to the button 31. For example, the inner wall of the sleeve rod 21 is connected to the spring seat 35 by injection molding or bolts. The receiving groove 351 of the spring seat 35 extends horizontally and the opening faces the button 31. During assembly: one end of the spring 33 is sleeved into the positioning post 352 with an interference fit. The other end of the spring 33 abuts against the abutting surface on the back of the force-bearing arm 321. The spring 33 is pre-compressed to a certain length to generate an initial preload. The positioning post 352 prevents the spring 33 from shifting laterally, and the contact surface converts the thrust of the spring 33 into the rotational torque of the pawl 32, ensuring the engagement depth of the pawl teeth 322 and the ratchet rack 111. The receiving groove 351 structure keeps the spring 33 coaxial during compression, avoiding jamming caused by off-center loading.
[0046] For example, the elastic element 33 is a torsion spring, mounted on the pin 34, and acts on the pawl 32. For example, the elastic element 33 is a tension spring, with its two ends connected to the pawl 32 and the sleeve 21 respectively, generating elastic force through stretching to drive the pawl 32 to rotate.
[0047] To improve the smoothness of the chuck 32's rotation, a guide rod 23 is fixedly installed inside the sleeve 21. The guide rod 23 has an axially oriented guide groove 231, and the chuck 32 is rotatably mounted within the guide groove 231 via a pin 34. For example, the guide rod 23 is made of 304 stainless steel tubing, with the axially extending guide groove 231 milled onto its outer surface. The pin 34 of the chuck 32 is inserted into bearing holes on the sidewall of the guide groove 231 at both ends, with a clearance fit. During assembly: the pin 34 of the chuck 32 is inserted into the guide groove 231, making the locking arm 323 form an angle of approximately 15° with the axis of the guide rod 23. The length of the guide groove 231 is slightly longer than the stroke of the sleeve 21, ensuring that the rotation angle of the chuck 32 throughout its stroke is within a preset range. The guide groove 231 guides the chuck 32, improving the smoothness of its rotation.
[0048] To improve the stability of the compression spring 22, it is sleeved on the outside of the guide rod 23, with its two ends abutting against the support surface at the top of the cylinder 11 and the inner top wall of the sleeve rod 21, respectively. For example, the compression spring 22 is coaxially sleeved on the outside of the guide rod 23, with dedicated buffer interfaces at both ends. A low-friction coefficient support surface is provided at the lower end, and an elastic buffer layer is provided at the upper end. The guide rod 23 serves as the axial positioning reference for the compression spring 22, effectively preventing the spring 22 from bending and deforming. The low-friction support surface reduces energy loss during lifting and lowering, improving operational smoothness. The elastic buffer layer absorbs impact vibrations, preventing noise from direct collisions between metal parts.
[0049] In some embodiments, a guide sleeve 12 is fixedly provided at the top of the cylinder 11, and the bottom end of the guide rod 23 extends into the guide sleeve 12 to form a sliding fit. For example, the guide sleeve 12 and the guide rod 23 form a sliding fit, a lubricating layer is provided on the inner wall of the guide sleeve 12, and the end of the guide rod 23 is chamfered. The dual-guide structure (guide sleeve 12 + guide rod 23) controls the radial offset to the micrometer level, the lubricating layer significantly reduces the coefficient of sliding friction, and the chamfering treatment prevents the mechanism from jamming, ensuring reliable motion under extreme operating conditions.
[0050] To prevent the sleeve rod 21 and the cylinder 11 from disengaging and to limit the maximum height adjustment, a limiting flange 112 is provided at the top of the cylinder 11, and a stop ring 211 that mates with the limiting flange 112 is provided at the bottom of the sleeve rod 21. For example, the limiting flange 112 and the stop ring 211 are constructed from a combination of hard and elastic materials. The difference in material hardness effectively absorbs impact energy, protecting the core transmission components. The dual limiting structure (mechanical limiting + elastic buffer) extends the service life of the equipment.
[0051] In one embodiment of the ratchet rack 111 described above, the stop surface 111a is a horizontal plane, and the guide surface 111b has an inclination angle of 45°-60°. The ratchet rack 111 has an asymmetrical tooth profile, the horizontal stop surface 111a is reinforced, and the inclined guide surface 111b has a smooth transition surface with a specific angle. The asymmetrical tooth profile reduces the effort required for the lifting operation by 40% while maintaining the same locking strength. The reinforced horizontal stop surface 111a increases the load-bearing capacity of a single tooth, and the smooth transition surface reduces the wear of the pawl teeth 322 during slippage, extending the service life of the component.
[0052] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A height-adjustable fan, characterized in that, The utility model relates to a height-adjustable fan, including: a base, a fan body and a height-adjusting assembly; a hollow cylinder is arranged on the base, and a vertical ratchet strip is arranged on the inner side of the cylinder; the fan body is provided with a hollow sleeve rod, the sleeve rod is in sliding sleeve joint with the cylinder, and a compression spring is arranged in the sleeve rod, the bottom end of the compression spring abuts against the top of the cylinder, and the top end supports the fan body; the height-adjusting assembly comprises a button, a pawl and an elastic member, the button is slidingly arranged at the side wall through hole of the sleeve rod, the pawl is rotatably arranged in the sleeve rod through a pin shaft, one end of the pawl forms a force arm in contact with the button, the other end forms a locking arm provided with a pawl tooth, and the elastic member is arranged in the sleeve rod and exerts an elastic force on the pawl to force the pawl tooth to engage with the ratchet strip in a normal state; wherein, the tooth surface structure of the ratchet strip comprises a stop surface and an inclined guide surface, the inclination direction of the guide surface is arranged as follows: when the fan body is lifted by an external force, the pawl tooth can slide along the guide surface and be unlocked step by step through the elastic rotation of the pawl; when the fan body is pressed down, the pawl tooth forms a rigid clamping with the stop surface of the ratchet strip; the height-adjusting assembly is configured as follows: during the descent of the fan body, the button needs to be continuously pressed to keep the pawl tooth disengaged from the ratchet strip; when the external force is removed, the pawl tooth is re-engaged with the ratchet strip and locked again by the reset of the elastic member.
2. The lift fan of claim 1, wherein, The elastic member is a spring, a spring seat is fixedly arranged in the sleeve rod, the spring seat is provided with a containing groove for containing the spring, the bottom of the containing groove is provided with a positioning column, one end of the spring is sleeved on the positioning column, and the other end abuts against the side of the force arm away from the button.
3. The lift fan of claim 1, wherein, A guide rod is fixedly arranged in the sleeve rod, and the guide rod is axially provided with a guide groove, and the pawl is rotatably arranged in the guide groove through a pin shaft.
4. The lift fan of claim 3, wherein, The compression spring is sleeved outside the guide rod, and the two ends thereof abut against the support surface of the top of the cylinder and the inner top wall of the sleeve rod respectively.
5. The lift fan of claim 1, wherein, A guide sleeve is fixedly arranged at the top of the cylinder, and the bottom end of the guide rod extends into the guide sleeve to form a sliding fit.
6. The lift fan of claim 1, wherein, The top of the cylinder is provided with a limiting flange, and the bottom of the sleeve rod is provided with a stop ring matched with the limiting flange.
7. The lift fan of claim 1, wherein, The stop surface is a horizontal surface, and the inclination angle of the guide surface is 45-60 degrees.