An expansion bolt assembly and a hoisting structure of a clothes drying machine

Abstract

This application discloses an expansion bolt assembly and a hoisting structure for a clothes drying rack, including a bolt, a stop block, and a support nut. The bolt includes a connected embedded part and a hoisting part, the hoisting part being provided with an installation groove, and the stop block being movably installed in the installation groove. The stop block can switch between a forward-moving state and a reverse-moving state. In the forward-moving state, the stop block is completely retracted into the installation groove, allowing the clothes drying rack's hoisting hole to pass smoothly through it. In the reverse-moving state, a portion of the stop block extends out of the installation groove and is supported and stabilized by the side wall of the installation groove, thus supporting the clothes drying rack and preventing it from falling downwards. This application utilizes the temporary support function of the stop block, allowing a single person to complete the insertion of the hoisting holes on both sides in steps, and subsequently install the support nut without lifting, simplifying installation and reducing labor costs by more than half.

Description

Technical Field

[0001] This application relates to the field of clothes drying rack technology, and more particularly to an expansion bolt assembly and a hoisting structure for a clothes drying rack. Background Technology

[0002] Currently, most hanging clothes drying racks on the market use expansion bolts to connect to the ceiling for installation. The specific process is as follows: First, the worker needs to drill holes at the preset positions on the ceiling and hammer the expansion tubes of the expansion bolts into the holes to complete the fixation. Then, the clothes drying rack needs to be moved to the installation position, and the machine body posture needs to be manually adjusted so that the four hanging holes on the machine body are precisely aligned with the expansion bolt screws and inserted upwards. Finally, the nuts are screwed on the protruding ends of the screws to complete the locking and fixing of the clothes drying rack to the ceiling.

[0003] This installation method has significant limitations in practice. The clothes dryer must be kept horizontal and aligned with the holes throughout the installation process, requiring at least two workers: one to support one end of the machine for balance, and the other to adjust the holes and tighten the nuts. It cannot be operated independently by a single person. Therefore, the existing clothes dryer installation method suffers from operational difficulties and high labor costs. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an expansion bolt assembly and a clothes drying rack hoisting structure, which can solve the above-mentioned problems existing in the related technology.

[0005] To achieve the above objectives, this application adopts the following technical solution: On one hand, an expansion bolt assembly is provided for suspending a clothes drying rack, including a screw, a stop block and a support nut. The screw includes a connected embedded part and a suspending part. The suspending part is provided with a mounting groove, and the stop block is movably installed in the mounting groove. The stop block can switch between a forward-moving state and a reverse-moving state. In the forward-moving state, the stop block is completely housed in the mounting groove, and the hanging hole of the clothes dryer can pass smoothly through the stop block. In the reverse-moving state, the stop block extends out of the mounting groove and is supported and stabilized by the side wall of the mounting groove. The part of the stop block extending out of the mounting groove supports the clothes dryer and prevents the clothes dryer from falling downwards.

[0006] Optionally, the stop block is rotatably mounted on the screw, and the stop block switches between the forward state and the reverse-stop state by rotating.

[0007] Optionally, in the forward state, the center of gravity of the stop block is located above its rotation center, so that under the action of gravity, the stop block automatically tends to rotate towards the reverse state.

[0008] Optionally, the stop block is connected to a reset elastic element, which drives the stop block to reset to the anti-reverse state through its own elastic force.

[0009] Optionally, the stop block is provided with an elastic anti-reverse element, and the support nut is provided with an anti-reverse ratchet. After the support nut is installed, the elastic anti-reverse element abuts against the anti-reverse ratchet to unidirectionally prevent the support nut from rotating in the direction of the thread.

[0010] Optionally, the anti-reverse ratchet is located on the bottom side of the support nut, and after the support nut is installed, the elastic anti-reverse member is located below the support nut to abut against the anti-reverse ratchet.

[0011] Optionally, after the support nut is installed, the support nut is located in the area above the mounting groove.

[0012] Optionally, the resilient anti-reverse component includes a fixed plate and an elastic plate connected at an angle, the fixed plate being fixed to the stop block, and the elastic plate extending toward the support nut to abut against the anti-reverse ratchet.

[0013] Optionally, the screw has a receiving groove located on the top side of the mounting groove. In the forward state, the end of the elastic piece away from the fixed piece is housed in the receiving groove, and the elastic piece applies a force to the stop block to push the stop block toward the anti-reverse state.

[0014] Optionally, the anti-reverse ratchet is located on the top side of the support nut, and after the support nut is installed, the elastic anti-reverse member is located above the support nut to abut against the anti-reverse ratchet.

[0015] Optionally, the resilient anti-reverse component includes a fixed plate, an adapter plate, and a clamping plate connected in a Z-shape. The fixed plate is fixed to the stop block, and the end of the clamping plate away from the adapter plate abuts against the anti-reverse ratchet.

[0016] Optionally, in the clamping piece, the clamping piece is bent in the direction extending from one end connected to the adapter piece to the free end of the clamping piece, and the bending direction is adapted to the thread screwing direction of the support nut.

[0017] On the other hand, a hanging structure for a clothes drying rack is provided, including the clothes drying rack and the aforementioned expansion bolt assembly.

[0018] The beneficial effects of this application are as follows: The expansion bolt assembly provided by this utility model, during the installation of a clothes drying rack, allows a single person to insert the bolts into the lifting holes on both sides in stages, compared to the traditional method requiring two people to lift and fix them. This is achieved through the temporary support function of the stop block, eliminating the need for subsequent lifting and installation of the support nuts, thus reducing labor costs by more than half. It also simplifies the installation process, improves efficiency, and eliminates the synchronous operation requirements of "lifting-aligning-tightening" in traditional installation. The step-by-step operation of temporary fixing followed by final tightening reduces installation difficulty and increases the efficiency of workers installing the support nuts. Furthermore, the expansion bolt assembly of this solution ensures installation safety and reliability. The mechanical anti-reverse structure of the stop block effectively prevents the clothes drying rack from accidentally falling after insertion, reducing operational risks. Finally, the support nuts provide rigid fixation, ensuring the stability of the clothes drying rack after installation. Attached Figure Description

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of one embodiment of the expansion bolt assembly described in this application. Figure 2 for Figure 1 A schematic diagram of the expansion bolt assembly from another perspective; Figure 3 for Figure 1 An exploded view of the expansion bolt assembly shown. Figure 4 for Figure 3 Enlarged view of section A in the middle; Figure 5 for Figure 1 A partial cross-sectional view of the expansion bolt assembly shown; Figure 6 This is a schematic diagram of another embodiment of the expansion bolt assembly described in this application. Figure 7 for Figure 6 Enlarged view of section B in the middle.

[0021] In the picture: 1. Screw; 11. Mounting slot; 12. Receiving slot; 2. Stop block; 3. Elastic anti-reverse component; 31. Fixing plate; 32. Elastic plate; 33. Adapter plate; 34. Clamping plate; 4. Support nut; 41. Anti-reverse ratchet. Detailed Implementation

[0022] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Currently, most hanging clothes drying racks on the market use expansion bolts to connect to the ceiling for installation. The specific process is as follows: First, the worker needs to drill holes at the preset positions on the ceiling and hammer the expansion tubes of the expansion bolts into the holes to complete the fixation. Then, the clothes drying rack needs to be moved to the installation position, and the machine body posture needs to be manually adjusted so that the four hanging holes on the machine body are precisely aligned with the expansion bolt screws and inserted upwards. Finally, the nuts are screwed on the protruding ends of the screws to complete the locking and fixing of the clothes drying rack to the ceiling.

[0026] This installation method has significant limitations in practice. The clothes dryer must be kept horizontal and aligned with the holes throughout the installation process, requiring at least two workers: one to support one end of the machine for balance, and the other to adjust the holes and tighten the nuts. It cannot be operated independently by a single person. Therefore, the existing clothes dryer installation method suffers from operational difficulties and high labor costs.

[0027] To overcome the above technical problems, refer to Figure 1 or Figure 6This application provides an expansion bolt assembly for suspending a clothes drying rack, including a screw 1, a stop block 2 and a support nut 4. The screw 1 includes a connected embedded part and a suspending part. The suspending part is provided with an installation groove 11, and the stop block 2 is movably installed in the installation groove 11. The stop block 2 can switch between a forward-moving state and a reverse-moving state. In the forward-moving state, the stop block 2 is completely housed in the mounting groove 11, and the hanging hole of the clothes dryer can pass smoothly through the stop block 2. In the reverse-moving state, the stop block 2 extends out of the mounting groove 11 and is supported and stabilized by the side wall of the mounting groove 11. The part of the stop block 2 extending out of the mounting groove 11 supports the clothes dryer and prevents the clothes dryer from falling downwards.

[0028] Specifically, the expansion bolt assembly includes at least a screw rod 1, an expansion tube, and a nut. The screw rod includes an embedded part and a lifting part. The expansion tube is sleeved in the embedded part, and the nut is installed in the lifting part. During installation, the embedded part and the expansion tube are embedded in the wall, ceiling, or other building structure for fixation. The lifting part protrudes from the building surface. The clothes dryer is hung in the lifting part, and then the nut is installed for locking.

[0029] The size of the hanging hole on the clothes drying rack is larger than the diameter of the screw 1 but smaller than the diameter of the support nut 4.

[0030] The screw 1 serves as the main load-bearing structure, and its surface is provided with an axially extending mounting groove 11. This groove provides space for the stop block 2 to move. At the same time, the overall diameter of the screw 1 must be smaller than the size of the clothes drying machine's hanging hole to ensure that the hanging hole can be smoothly fitted in. The stop block 2 can be movably assembled in the mounting groove 11 and has two working modes: forward and reverse. In the forward mode, the stop block 2 is completely retracted into the mounting groove 11. At this time, the outer diameter of the screw 1 does not exceed the size of the hanging hole, allowing the clothes drying machine's hanging hole to pass smoothly upward along the axial direction of the screw 1. In the reverse mode, part of the stop block 2 extends outward from the mounting groove 11, and the stop block 2 is limited and supported by the side wall of the mounting groove 11 (forming a rigid contact). At this time, the size of the stop block 2 protruding from the surface of the screw 1 is larger than the gap between the hanging hole and the screw 1, which can provide support for the clothes drying machine from below. The support nut 4 serves as the final fixing component, and its diameter is larger than the size of the clothes drying machine's mounting hole. After the stop block 2 completes the temporary support, the extended end of the screw rod 1 is screwed in and pressed against the clothes drying machine to achieve long-term stable fixing.

[0031] Based on the expansion bolt assembly provided in this embodiment, when installing the clothes drying rack, first align the hanging hole at one end of the clothes drying rack with the screw 1 that is fixed to the ceiling. During the upward insertion process, the stop block 2 is forced to be housed in the mounting groove 11 (forward state) by the inner wall of the hanging hole, ensuring smooth passage. After the hanging hole completely passes the stop block 2, the stop block 2 is not constrained by external force and automatically (or through a preset elastic structure) switches to the anti-reverse state. Part of it extends outward from the mounting groove 11, and the stop block 2 is limited and supported by the side wall of the mounting groove 11, forming a support for the clothes drying rack from below, preventing the clothes drying rack from falling back due to gravity, and achieving temporary fixation on one side.

[0032] Repeat the above operation, insert the corresponding screw 1 into the hoisting hole at the other end of the clothes drying rack, and complete the overall temporary support through the stop block 2 on the other side. At this time, the clothes drying rack is in a stable suspended state and does not require manual lifting.

[0033] After the installer frees their hands, they can easily screw the support nut 4 into the protruding end of the screw 1 until the nut presses against the surface of the clothes drying rack. At this time, the support nut 4 and the stop block 2 (or ceiling) share the load, and long-term reliable fixation is achieved through thread locking.

[0034] In summary, based on the expansion bolt assembly provided in this embodiment, during the installation of the clothes drying rack, compared to the traditional method requiring two people to lift and fix it, this application, through the temporary support function of the stop block 2, allows a single person to complete the insertion of the hanging holes on both sides in steps, and then install the support nut 4 without lifting, reducing labor costs by more than half. It also simplifies the installation process, improves efficiency, and eliminates the synchronous operation requirements of "lifting-aligning-tightening" in traditional installation. By temporarily fixing first and then finally locking, the installation difficulty is reduced, and the efficiency of workers installing the support nut 4 is improved. Furthermore, the expansion bolt assembly of this embodiment also ensures installation safety and reliability. The mechanical anti-reverse structure of the stop block 2 effectively prevents the clothes drying rack from accidentally falling after insertion, reducing operational risks, and finally, rigid fixing is achieved through the support nut 4, ensuring the stability of the clothes drying rack after installation.

[0035] In one embodiment, the stop block 2 is rotatably mounted on the screw 1, and the stop block 2 switches between the forward state and the reverse state by rotating.

[0036] The mounting groove 11 has a radially extending pin hole, which is hinged to the stop block 2, allowing the stop block 2 to rotate around the pin within the mounting groove 11 (the rotation angle is usually 0° to 90°, limited by the side wall of the mounting groove 11). One side wall of the mounting groove 11 is set as a limiting surface (usually the bottom surface of the mounting groove 11). When the stop block 2 rotates to the non-reverse state, its extended end rigidly abuts against the limiting surface, restricting further rotation.

[0037] The stop block 2 is rotatably mounted in the mounting groove 11 via a pin. The free end is the force-bearing part, and its center of gravity is biased towards the free end. Alternatively, a torsion spring may be provided at the hinge (optional). When there is no external force, the free end naturally rotates outward under the action of gravity or the elastic force of the torsion spring, forming a non-reverse state. When subjected to external pressure, it can overcome gravity / elastic force and rotate inward, conforming to the avoidance surface and retracting into the mounting groove 11, forming a forward state. The rotation radius of the free end of the stop block 2 must meet the following requirements: in the forward state, its outer edge does not exceed the outer circle of the screw 1 (ensuring that the lifting hole can pass through smoothly); in the non-reverse state, the dimension by which the outer edge exceeds the outer circle of the screw 1 is greater than the gap between the lifting hole and the screw 1, so as to form effective support.

[0038] During installation, as the clothes drying rack's mounting hole is inserted upwards along the screw 1, the hole wall first contacts the free end inclined surface (or arc surface) of the stop block 2, applying a radially inward compressive force. This force drives the stop block 2 to rotate inwards around the pin axis, compressing the torsion spring (if present) or overcoming its own weight, until the stop block 2 is completely housed in the mounting groove 11, allowing the mounting hole to continue moving upwards without obstruction. Once the mounting hole has completely passed the stop block 2, the compressive force of the hole wall on the stop block 2 disappears. Under the action of gravity (center of gravity offset design) or the torsion spring force, the stop block 2 rotates outwards around the pin axis until its free end abuts the limiting surface of the mounting groove 11. At this point, the free end protrudes beyond the outer circle of the screw 1. Since the protrusion is larger than the gap between the mounting hole and the screw 1, the stop block 2 can support the edge of the clothes drying rack's mounting hole from below, preventing it from sliding downwards due to gravity, thus providing temporary support.

[0039] In this embodiment, rigid rotation is achieved through a pin hinge. Combined with the limiting and clearance surfaces of the mounting groove 11, this ensures precise and controllable positioning of the stop block 2 in both forward and reverse states, preventing malfunctions (such as jamming or false triggering) caused by shaking or deformation. This design is more wear-resistant than elastic telescopic structures. The function is achieved solely through the cooperation of the pin, stop block 2, and mounting groove 11, eliminating the need for complex elastic components or locking mechanisms. This results in fewer parts, lower processing difficulty, suitability for mass production, and no need for precise calibration during assembly, reducing production and maintenance costs. Rotation is driven by the natural pressure of the lifting hole wall, requiring no additional operation. Gravity offset or torsion spring design ensures automatic reset after force release, eliminating the need for manual intervention during reset. Single-person operation allows for quick temporary fixation on both sides, further shortening installation time.

[0040] In one embodiment, in the forward state, the center of gravity of the stop block 2 is located above its rotation center, so that under the action of gravity, the stop block 2 automatically tends to rotate towards the reverse state.

[0041] The rotation center of the stop block 2 (i.e., the pin shaft connected to the screw 1) is located directly below the center of gravity, forming a layout with the center of gravity at the top and the rotation center at the bottom. When the lifting hole completely passes the stop block 2, the pressure on the hole wall disappears, and the gravitational torque becomes dominant, driving the stop block 2 to rotate outward around the rotation center until the stop block 2 abuts against the limiting surface of the mounting groove 11. At this time, the stop block 2 is in a stable anti-reverse state, and its protruding part supports the edge of the lifting hole, preventing the clothes drying rack from falling back.

[0042] In this embodiment, elastic elements such as torsion springs are eliminated, and state switching is achieved solely by gravity. This avoids fatigue failure of elastic elements after long-term use (such as elasticity decay, corrosion, and jamming), significantly extending their service life. The installation and calibration of torsion springs are eliminated; the stop block 2 only needs to be hinged to the screw 1 via a pin, requiring no additional adjustment, thus improving production efficiency and further reducing costs.

[0043] In one embodiment, the stop block 2 is connected to a reset elastic element, which drives the stop block 2 to reset to the anti-reverse state through its own elastic force.

[0044] Optionally, a torsion spring is used as the core elastic element (a coil spring, leaf spring, etc. can also be used). One end of the spring is fixed to the inner wall of the mounting groove 11 of the screw 1 (such as a protrusion or slot next to the pin), and the other end is rigidly connected to the hinge end of the stop block 2 (such as a protrusion on the side of the stop block 2). In its natural state, the torsion spring is in a slightly pre-tensioned state, applying a torque to the stop block 2 to rotate outward about the center of rotation.

[0045] During installation, as the clothes drying rack is inserted upwards through the mounting hole, the hole wall presses against the free end of the stop block 2, generating an inward rotating external torque. This torque must be greater than the preload torque of the torsion spring, forcing the stop block 2 to rotate inwards around the pin axis. Simultaneously, the torsion spring is further torsionized and stores elastic potential energy. Once the mounting hole has completely passed the stop block 2, the pressure from the hole wall disappears, and the torsion spring releases its stored elastic potential energy, generating an outward rotating restoring torque. This drives the stop block 2 to rotate rapidly around the pin axis until it contacts the limiting surface of the mounting groove 11. At this point, the torsion spring returns to its preloaded state, and the stop block 2 is stably in a non-reverse state. Its protruding part supports the edge of the mounting hole, providing temporary support for the clothes drying rack.

[0046] In this embodiment, the elastic restoring force of the reset elastic element can immediately drive the stop block 2 to reset the moment it disengages from the lifting hole. Compared to gravity drive (which relies on the natural downward swing of the center of gravity), the response time is shortened, improving operational safety. The elastic force of the reset elastic element ensures that the stop block 2 is not restricted by the installation posture (such as the screw 1 being tilted or the ceiling being non-horizontal). Even in special working conditions where gravity drive fails, the elastic force of the torsion spring can still ensure that the stop block 2 is reliably reset to the anti-reverse state, overcoming the limitations of the center of gravity offset design during tilted installation.

[0047] In one embodiment, reference is made to Figure 2 or Figure 7 The stop block 2 is provided with an elastic anti-reverse component 3, and the support nut 4 is provided with an anti-reverse ratchet 41. After the support nut 4 is installed, the elastic anti-reverse component 3 abuts against the anti-reverse ratchet 41 to unidirectionally prevent the support nut 4 from rotating in the direction of the thread.

[0048] Optionally, the elastic anti-reverse component 3 is an elastic protrusion (such as a plastic spring or metal spring sheet) integrally formed or assembled on the stop block 2. The elastic anti-reverse component 3 has a certain elastic deformation capability, naturally extending outward when not under force, and bending inward and contracting when under force. The support nut 4 has a ratchet structure with a ring array on the side facing the stop block 2. The inclination direction of the ratchet matches that of the elastic anti-reverse component 3. It is a gentle slope along the screw tightening direction (such as clockwise) and a steep slope along the screw unscrewing direction (such as counterclockwise). The ratchet spacing is adapted to the tooth surface size of the elastic anti-reverse component 3 to form a one-way meshing relationship.

[0049] When the support nut 4 is screwed into the screw 1, the gentle slope of its ratchet 41 will squeeze the elastic anti-reverse member 3, forcing the elastic anti-reverse member 3 to bend inward (without hindering tightening); when the nut is tightened to the position, the elastic anti-reverse member 3 will reset under its own elastic force, and its anti-reverse tooth surface will rigidly abut against the steep slope of the ratchet, forming a one-way lock.

[0050] Traditional support nuts 4 rely solely on thread friction for fixation, which can easily loosen due to shaking, vibration, or temperature changes in the clothes dryer over long-term use, even posing a risk of falling. This design utilizes a mechanically engaged one-way anti-reverse structure. After the nut is tightened, the elastic anti-reverse component 3 resets under its own elasticity. Its anti-reverse teeth precisely engage in the gap between two adjacent ratchet teeth, forming surface contact with the steep slope of the ratchet. If the nut tends to unscrew counterclockwise due to vibration, the weight of the clothes dryer, or other factors, the steep slope of the ratchet will rigidly resist the anti-reverse teeth of the elastic anti-reverse component 3. Because the contact surfaces are perpendicular or at a large angle, the elastic anti-reverse component 3 cannot deform further to avoid this, thus preventing the nut from unscrewing and achieving anti-loosening locking. In other words, this embodiment physically prevents the nut from unscrewing, maintaining a locked state even if the thread friction weakens. It is particularly suitable for high-rise residential buildings, balconies, and other scenarios prone to vibration. During the tightening process, the elastic anti-reverse component 3 can self-retract without increasing the resistance to nut installation, and a single person can easily complete the tightening; moreover, the anti-loosening structure is integrated into the stop block 2 and the nut, without the need to modify the main thread design of the screw 1, and is compatible with the existing clothes drying rack's hanging hole and installation process, resulting in low promotion costs.

[0051] In one embodiment, combined with Figures 1-5 In the illustrated scheme, the anti-reverse ratchet 41 is located on the bottom side of the support nut 4. After the support nut 4 is installed, the elastic anti-reverse member 3 is located below the support nut 4 to abut against the anti-reverse ratchet 41.

[0052] For example, the ratchet teeth 41 are distributed in a ring on the bottom side of the support nut 4 (i.e. the side facing away from the ceiling). The ratchet teeth are evenly arranged along the circumference of the nut. Each ratchet tooth has a right-angled triangular structure. It is an inclined guide surface (e.g., an inclination angle of 20°-30°) along the thread tightening direction (e.g., clockwise) and a vertical anti-reverse surface along the unscrewing direction (e.g., counterclockwise). The tooth height is 1-2mm and the tooth pitch is adapted to the width of the elastic anti-reverse component 3.

[0053] The elastic anti-reverse component 3 is an elastic sheet 32 ​​(made of metal or high-strength plastic) that extends upward relative to the free end of the stop block 2. Its top end is higher than the support surface of the stop block 2, and when the stop block 2 is in the anti-reverse state, the top end of the elastic anti-reverse component 3 is exactly located on the rotation trajectory of the bottom side of the support nut 4.

[0054] When the support nut 4 is tightened upwards along the thread of the screw 1, the anti-reverse ratchet 41 on its bottom side rotates synchronously with the nut. After the support nut 4 passes the stop block 2, the stop block 2 returns to the anti-reverse state. The inclined guide surface of the anti-reverse ratchet 41 on the support nut 4 will continue to contact the top of the elastic anti-reverse member 3 below. Since the guide surface is an inclined structure, it will apply a downward component force to the elastic anti-reverse member 3 when in contact, forcing the elastic anti-reverse member 3 to bend and deform downwards, thereby avoiding the ratchet and ensuring that the nut can be tightened smoothly to the position of pressing the clothes drying rack. When the nut is tightened in place, if the support nut 4 tends to rotate counterclockwise due to vibration, load changes, etc., the vertical anti-reverse surface of the anti-reverse ratchet 41 will apply a pushing force to the elastic anti-reverse member 3. However, the elastic anti-reverse member 3 is supported by the body of the stop block 2 below, thereby completely preventing the support nut 4 from rotating out.

[0055] In one embodiment, reference is made to Figure 2 After the support nut 4 is installed, the support nut 4 is located in the area above the mounting groove 11.

[0056] After installation, the threaded section of the support nut 4 and the screw 1 is completely located above the mounting groove 11. The mounting groove 11 is not opened in this area, so the structural integrity of the screw 1 is better (there is no weakening of strength caused by axial slotting), the load-bearing capacity of the threaded connection is stronger, and it can more stably withstand the long-term load of the clothes drying rack.

[0057] In one embodiment, reference is made to Figure 4 and Figure 5 The elastic anti-reverse component 3 includes a fixed piece 31 and an elastic piece 32 connected at an angle. The fixed piece 31 is fixed to the stop block 2, and the elastic piece 32 extends toward the support nut 4 to abut against the anti-reverse ratchet 41.

[0058] For example, the fixing plate 31 is a flat plate structure, which is rigidly connected to the side of the stop block 2 by welding, injection molding or screw fastening; the elastic plate 32 is a thin plate with elastic deformation capability (such as spring steel plate or nylon elastic plate 32), one end of which is connected to the side of the fixing plate 31 away from the stop block 2, and the two form an angle of 50°-80° (in the natural state), so that the elastic plate 32 extends inclined towards the support nut 4.

[0059] When the stop block 2 rotates to switch states, the fixing plate 31 moves synchronously with the stop block 2, thereby driving the elastic plate 32 to compress or reset. After installation, even if the stop block 2 vibrates slightly due to vibration, the rigid connection of the fixing plate 31 can ensure the relative position of the elastic plate 32 and the ratchet 41 remains stable, preventing locking failure.

[0060] In one embodiment, the screw 1 has a receiving groove 12 located on the top side of the mounting groove 11. In the forward state, the end of the elastic piece 32 away from the fixed piece 31 is housed in the receiving groove 12, and the elastic piece 32 applies a force to the stop block 2 to push the stop block 2 toward the anti-reverse state.

[0061] Reference Figure 5 The receiving groove 12 is formed on the inner wall of the top side of the mounting groove 11 of the screw 1 (near the ceiling side), and is in the shape of a groove. Its depth and width are adapted to the size of the free end of the elastic sheet 32.

[0062] The end of the elastic piece 32 away from the fixed piece 31 (free end) is fully embedded in the receiving groove 12 in the forward state, so as to avoid the protrusion of the elastic piece 32 from hindering the installation of the clothes drying rack or the screwing in of the support nut 4. At this time, the elastic piece 32 is squeezed by the receiving groove 12 and undergoes bending deformation (contracting towards the fixed piece 31), forming an elastic potential energy reserve. When the stop block 2 loses external force, the elastic piece 32 pushes the stop block 2 towards the anti-reverse state. When switching to the anti-reverse state, the free end of the elastic piece 32 is disengaged from the receiving groove 12, resets under the action of elastic force and abuts against the anti-reverse ratchet 41 of the support nut 4.

[0063] When the hanging hole of the clothes drying rack is inserted into the screw 1 and presses against the stop block 2, the stop block 2 rotates inward and enters the forward running state. Simultaneously, it drives the elastic plate 32 to move towards the top side of the mounting groove 11. After the free end of the elastic plate 32 contacts the groove wall of the receiving groove 12, it is gradually bent by the pressure of the groove wall and embedded in the receiving groove 12. At this time, the elastic plate 32 undergoes elastic deformation and stores potential energy. Since the elastic plate 32 is constrained by the receiving groove 12, its reaction force on the fixed plate 31 forms an outward thrust. This thrust is converted into a torque that drives the stop block 2 to rotate (opposite to the pressing force of the hanging hole), so that the stop block 2 always has a tendency to return to the reverse state. Only when the pressing force of the hanging hole is slightly greater than this torque is the forward running state maintained. When the lifting hole completely passes the stop block 2, the compressive force on the hole wall disappears, the deformation potential energy of the elastic plate 32 is released, and its free end pops out from the receiving groove 12 and pushes the stop block 2 to rotate outward (the thrust torque of the elastic plate 32 becomes dominant). Combined with the effect of the stop block 2's own gravity, the stop block 2 is accelerated to switch to the anti-reverse state.

[0064] Similarly, during the subsequent installation of the support nut 4, the stop block 2 is first pushed to the forward state, and the elastic plate 32 is compressed in the receiving groove 12; after the support nut 4 passes the stop block 2 and the elastic plate 32, the stop block 2 returns to the anti-reverse state, and the elastic plate 32 extends out and abuts against one side of the anti-reverse ratchet 41 of the support nut 4.

[0065] In this embodiment, in the forward state, the free end of the elastic sheet 32 ​​is housed in the receiving groove 12, avoiding direct friction with the wall of the lifting hole (only the wall of the receiving groove 12 is in contact), thus reducing wear on the elastic sheet 32. Importantly, it also prevents the elastic sheet 32 ​​from interfering with the installation of the clothes drying machine and the support nut 4. Furthermore, in the forward state, the potential energy stored in the elastic sheet 32 ​​pre-drives the stop block 2 through the thrust torque, so that once the lifting hole or support nut 4 disengages from the stop block 2, it can quickly switch to the anti-reverse state under the action of elastic force.

[0066] In one embodiment, reference is made to Figure 6 and Figure 7 The anti-reverse ratchet 41 is located on the top side of the support nut 4. After the support nut 4 is installed, the elastic anti-reverse member 3 is located above the support nut 4 to abut against the anti-reverse ratchet 41.

[0067] In this embodiment, the support nut 4, after being installed, is located below the elastic anti-reverse component 3. The main body of the support nut 4 (including the threaded section) overlaps axially with the bottom area of ​​the mounting groove 11. That is, the top of the nut does not exceed the top side boundary of the mounting groove 11, and the bottom can cooperate with the area of ​​the screw 1 located below the mounting groove 11. This shortens the overall downward protrusion of the screw 1 (from the ceiling to the bottom of the screw 1). Compared with the design where the support nut 4 is located above the mounting groove 11, the downward protrusion of the screw 1 in this method is shorter, which can avoid mutual interference with the structure inside the clothes dryer and improve installation compatibility.

[0068] In one embodiment, the elastic anti-reverse member 3 includes a fixing piece 31, an adapter piece 33, and a clamping piece 34 connected in a Z-shape. The fixing piece 31 is fixed to the stop block 2, and the end of the clamping piece 34 away from the adapter piece 33 abuts against the anti-reverse ratchet 41.

[0069] The fixing plate 31 is a straight section, rigidly connected to the stop block 2 by welding, injection molding, or bolt fastening. The connecting surface is parallel to the rotation plane of the stop block 2, ensuring that the overall structure moves synchronously with the stop block 2. The adapter plate 33 is connected to the end of the fixing plate 31, forming a Z-shaped intermediate transition section. Its length determines the distance between the clamping plate 34 and the stop block 2, reserving deformation space for the clamping plate 34. The clamping plate 34 is connected to the adapter plate 33 (parallel to the fixing plate 31 but extending in the opposite direction), forming a Z-shaped end action section, which has the elastic deformation capability to bend along the direction of the adapter plate 33.

[0070] When the support nut 4 is tightened along the screw 1 (e.g., clockwise), the gentle slope of its anti-reverse ratchet 41 contacts the locking plate 34. Due to the elasticity of the locking plate 34, this pressure forces the locking plate 34 to bend towards the stop block 2 to avoid the anti-reverse ratchet 41, ensuring that the support nut 4 can be smoothly tightened to the preset position. After the support nut 4 is tightened to the position, if the nut tends to unscrew (e.g., counterclockwise), the steep slope of the ratchet will apply a reverse thrust to the locking plate 34. However, the locking plate 34 is supported by the adapter plate 33 and cannot bend outward, thus forming a blockage and preventing the nut from unscrewing.

[0071] In one embodiment, the clamping piece 34 is bent in the direction extending from the end connected to the adapter piece 33 to the free end of the clamping piece 34, and the bending direction is adapted to the thread screwing direction of the support nut 4.

[0072] As the locking plate 34 extends from the end connected to the adapter plate 33 towards the free end, it bends in an arc along the threaded insertion direction of the support nut 4 (e.g., clockwise), forming a curved surface structure that bends in accordance with the insertion direction. The bending direction of the free end naturally points towards the gentle slope side of the ratchet, while the vertical anti-reverse surface of the free end faces the steep slope side of the ratchet. During tightening, the gentle slope of the anti-reverse ratchet 41 can slide smoothly along the curved surface of the locking plate 34, reducing contact resistance; at the same time, the curved structure makes the elastic deformation direction of the locking plate 34 consistent with the bending direction, strengthening the one-way locking characteristic.

[0073] On the other hand, a hanging structure for a clothes drying rack is provided, including the clothes drying rack and the aforementioned expansion bolt assembly.

[0074] The clothes drying rack in this embodiment includes a main unit with a mounting hole, which is used to suspend the clothes rack to the expansion bolt assembly during installation.

[0075] Similarly, based on the expansion bolt assembly provided in this embodiment, the hanging structure of the clothes drying rack in this embodiment can be operated by a single person when installing the clothes drying rack, which has the advantages of simple operation and low installation labor cost.

[0076] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0077] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0079] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. An expansion bolt assembly for suspending a clothes drying rack, characterized in that, It includes a screw, a stop block, and a support nut. The screw includes a connected embedded part and a lifting part. The lifting part is provided with a mounting groove, and the stop block is movably installed in the mounting groove. The stop block can switch between a forward-moving state and a reverse-moving state. In the forward-moving state, the stop block is completely housed in the mounting groove, and the hanging hole of the clothes dryer can pass smoothly through the stop block. In the reverse-moving state, the stop block extends out of the mounting groove and is supported and stabilized by the side wall of the mounting groove. The part of the stop block extending out of the mounting groove supports the clothes dryer and prevents the clothes dryer from falling downwards.

2. The expansion bolt assembly according to claim 1, characterized in that, In the forward state, the center of gravity of the stop block is located above its rotation center, so that under the action of gravity, the stop block automatically tends to rotate towards the reverse state.

3. The expansion bolt assembly according to claim 1, characterized in that, The stop block is connected to a reset elastic element, which drives the stop block to reset to the anti-reverse state through its own elastic force.

4. The expansion bolt assembly according to claim 1, characterized in that, The stop block is provided with an elastic anti-reverse element, and the support nut is provided with an anti-reverse ratchet. After the support nut is installed, the elastic anti-reverse element abuts against the anti-reverse ratchet to unidirectionally prevent the support nut from rotating in the direction of the thread.

5. The expansion bolt assembly according to claim 4, characterized in that, The anti-reverse ratchet is located on the bottom side of the support nut. After the support nut is installed, the elastic anti-reverse element is located below the support nut to abut against the anti-reverse ratchet.

6. The expansion bolt assembly according to claim 5, characterized in that, The resilient anti-reverse component includes a fixed plate and an elastic plate connected at an angle. The fixed plate is fixed to the stop block, and the elastic plate extends toward the support nut to abut against the anti-reverse ratchet.

7. The expansion bolt assembly according to claim 6, characterized in that, The screw has a receiving groove on the top side of the mounting groove. In the forward state, the end of the elastic piece away from the fixed piece is housed in the receiving groove, and the elastic piece applies a force to the stop block to push the stop block toward the anti-reverse state.

8. The expansion bolt assembly according to claim 4, characterized in that, The anti-reverse ratchet is located on the top side of the support nut. After the support nut is installed, the elastic anti-reverse element is located above the support nut to abut against the anti-reverse ratchet.

9. The expansion bolt assembly according to claim 8, characterized in that, The resilient anti-reverse component includes a fixed plate, an adapter plate, and a clamping plate connected in a Z-shape. The fixed plate is fixed to the stop block, and the end of the clamping plate away from the adapter plate abuts against the anti-reverse ratchet.

10. A hoisting structure for a clothes drying rack, characterized in that, Includes a clothes drying rack and an expansion bolt assembly as described in any one of claims 1-9.

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