Load-bearing lower pulley and door and window system comprising the same

Abstract

The utility model discloses a load -bearing lower pulley and including its door and window system. Load -bearing lower pulley includes: first casing, second casing, the first casing is movably connected, wheel structure is set up in the second casing, elastic part is set up between the first casing and the second casing, and elastic part is configured to exert elastic force to the second casing, when the pressure that the first casing and the second casing receive can overcome the elastic force of elastic part, the second casing is in the gathering position relative to the first casing, when the pressure that the first casing and the second casing receive fails to overcome the elastic force of elastic part, elastic part drives the second casing to move down from the gathering position relative to the first casing. Thus, when the door and window fan jumps up, elastic part restores deformation and drives the second casing to move down from the gathering position relative to the first casing, and thus, wheel structure can always keep slidingly fitted on the slide rail, effectively avoids the derailment phenomenon caused by the door and window fan jumping, and improves the stability and security of door and window sliding.

Description

Technical Field

[0001] This utility model belongs to the technical field of door and window hardware accessories, specifically relating to load-bearing sliding rollers and door and window systems including them. Background Technology

[0002] In the sliding structure of doors and windows, the load-bearing roller is a crucial component. It is typically located at the bottom of the door or window sash, playing a vital role in supporting the weight of the sash and guiding it smoothly along the track. However, in existing technologies, when the door or window sash collides with the damping structure or frame during sliding, it is prone to bouncing. This bouncing causes abrupt changes in the pressure distribution on the load-bearing roller, disrupting the normal contact between the roller and the track, and potentially causing the roller to detach from the track. Once the roller derails, the sliding of the door or window sash loses stability and guidance, severely impacting its normal use and potentially damaging the door / window itself and surrounding structures, causing inconvenience and safety hazards for users. Utility Model Content

[0003] In order to overcome at least one of the defects described in the prior art, the present invention provides a load-bearing sliding wheel and a door and window system including the same, so as to solve the problem that the load-bearing sliding wheel is easy to disengage from the slide rail when the door and window sash is collided in the prior art, and ensure that the door and window sash can slide stably under various working conditions, thereby improving the safety and reliability of door and window use.

[0004] The technical solution adopted by this utility model to solve its problem is: A load-bearing sliding wheel includes: a first housing; a second housing movably connected to the first housing; a wheel structure disposed in the second housing; and an elastic element disposed between the first housing and the second housing, the elastic element being configured to apply an elastic force to the second housing; when the pressure on the first housing and the second housing is sufficient to overcome the elastic force of the elastic element, the second housing is in a retracted position relative to the first housing; when the pressure on the first housing and the second housing fails to overcome the elastic force of the elastic element, the elastic element drives the second housing to move downward relative to the first housing from the retracted position.

[0005] As an optional implementation, one of the first housing and the second housing is fixedly provided with a sliding shaft, and the other housing is provided with a sliding groove. The sliding groove extends in a direction inclined to the horizontal direction, and the sliding shaft and the sliding groove are slidably connected.

[0006] As an optional implementation, the first housing is sleeved on the second housing, the sliding shaft is disposed in the first housing, and the sliding groove is disposed in the second housing.

[0007] As an optional implementation, the load-bearing pulley further includes an adjustment assembly connected to the elastic element, the adjustment assembly being used to adjust the elastic force applied by the elastic element to the second housing.

[0008] As an optional implementation, the adjustment assembly includes an adjustment rod and a connecting block. The adjustment rod is rotatably disposed on the first housing, and the connecting block is screwed to the adjustment rod. When the adjustment rod rotates, the connecting block moves along the axial direction of the adjustment rod. The first end of the elastic element abuts against the connecting block, and the second end of the elastic element abuts against the second housing.

[0009] As an optional implementation, the adjustment assembly further includes a gasket disposed in the second housing, and the second end of the elastic member abuts against the gasket.

[0010] As an optional implementation, the adjustment assembly further includes a limiting retaining ring, and a limiting ring groove is provided on the periphery of the adjustment rod. The limiting retaining ring is disposed in the first housing and engaged with the limiting ring groove to limit the axial displacement of the adjustment rod.

[0011] As an optional implementation, the first housing and / or the second housing are provided with a limiting block, which is used to limit the axial movement of the connecting block on the adjusting rod.

[0012] As an optional implementation, the wheel structure includes a wheel body and a wheel seat. The wheel seat is disposed on the second housing, and the wheel body is disposed on the wheel seat. The wheel body is provided with a first groove, and the wheel seat is provided with a second groove. Both the first groove and the second groove are used for sliding connection with a slide rail. The width of the first groove is smaller than the width of the second groove.

[0013] In addition, this utility model also provides a door and window system, including a load-bearing sliding wheel as described in any of the above claims, and a door and window sash, wherein the first housing is connected to the bottom of the door and window sash.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: When the door and window sashes do not collide with other components, the door and window sashes and the sliding rail exert a large pressure on the first and second housings, which can overcome the elastic force of the elastic element, compress the elastic element, and thus keep the second housing in the retracted position relative to the first housing. At this time, the wheel structure slides normally.

[0015] When the door / window sash collides with the damping structure or other components such as the door / window frame, the sash bounces upwards. The pressure exerted by the sash and the sliding rail on the first and second housings decreases but cannot overcome the elastic force of the elastic element. At this point, the elastic element recovers its deformation and drives the second housing to move downwards relative to the first housing from its retracted position. In this way, the wheel structure can always maintain sliding contact with the sliding rail, effectively preventing derailment caused by the bounce of the door / window sash and improving the stability and safety of the sliding door / window. In addition, this load-bearing sliding wheel can adapt to different specifications and types of door / window sashes and sliding rails. By adjusting parameters such as the elastic coefficient and initial state of the elastic element, it can meet the usage requirements under different working conditions, exhibiting strong versatility and adaptability, and facilitating its promotion and application in the market. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the load-bearing sliding wheel (the second housing is in a retracted position relative to the first housing) according to an embodiment of this application; Figure 2 This is a three-dimensional structural diagram of the load-bearing sliding wheel (the second housing moves downward relative to the first housing from the retracted position) according to an embodiment of this application; Figure 3 This is an exploded structural diagram of the load-bearing sliding wheel according to an embodiment of this application; Figure 4 This is a three-dimensional structural diagram of a load-bearing sliding wheel (the first housing is not shown, and the second housing is in a retracted position relative to the first housing) according to an embodiment of this application. Figure 5 This is a three-dimensional structural diagram of a load-bearing sliding wheel (the first housing is not shown, and the second housing moves downward relative to the first housing from a retracted position) according to an embodiment of this application. Figure 6 yes Figure 5 Enlarged view of part A in the middle; Figure 7 This is an exploded structural diagram of the elastic member and adjustment assembly according to an embodiment of this application; Figure 8 This is a three-dimensional structural diagram of the wheel structure according to an embodiment of this application.

[0018] Explanation of key figure labels: 1. First housing; 11. Sliding shaft; 12. Rotating hole; 13. Shaft hole; 2. Second housing; 21. Sliding groove; 22. Guide groove; 23. Limiting block; 3. Wheel structure; 31. Wheel body; 311. First groove; 32. Wheel seat; 321. Second groove; 4. Elastic element; 41. First end; 42. Second end; 5. Adjusting assembly; 51. Adjusting rod; 511. Head; 512. Neck; 513. Rod part; 514. Limiting ring groove; 52. Connecting block; 521. Abutment part; 522. Connecting column; 53. Gasket; 54. Limiting retaining ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0025] Please see Figures 1 to 5 This application provides a load-bearing sliding wheel, including a first housing 1, a second housing 2, a wheel structure 3, and an elastic element 4. The first housing 1 is used to connect to the bottom of the door / window sash. Its shape and size are designed according to actual installation requirements, serving to fix and support, ensuring that the load-bearing sliding wheel is stably connected to the door / window sash and can bear the weight of the door / window sash. The second housing 2 is movably connected to the first housing 1. This movable connection can be a common method such as a hinge or a sliding groove connection, allowing the second housing 2 to move relative to the first housing 1. The wheel structure 3 is disposed on the second housing 2 and is used to slide along the slide rail to realize the movement function of the door / window sash. The elastic element 4 is disposed between the first housing 1 and the second housing 2. The elastic element 4 is configured to apply an elastic force to the second housing 2. When the pressure on the first housing 1 and the second housing 2 can overcome the elastic force of the elastic element 4, the second housing 2 is in a closed position relative to the first housing 1. When the pressure on the first housing 1 and the second housing 2 fails to overcome the elastic force of the elastic element 4, the elastic element 4 drives the second housing 2 to move downward relative to the first housing 1 from the closed position.

[0026] The load-bearing sliding wheel provided in this application embodiment has the following characteristics: When the door / window sash does not collide with other components, the pressure exerted by the door / window sash and the sliding rail on the first housing 1 and the second housing 2 is relatively large and can overcome the elastic force of the elastic element 4, causing the elastic element 4 to be compressed. This keeps the second housing 2 in the retracted position relative to the first housing 1, and the wheel structure 3 slides normally at this time. When the door / window sash collides with the damping structure or other components such as the door / window frame, the door / window sash jumps upward. The pressure exerted by the door / window sash and the sliding rail on the first housing 1 and the second housing 2 decreases and cannot overcome the elastic force of the elastic element 4. At this time, the elastic element 4 restores its deformation and drives the second housing 2 to move downward relative to the first housing 1 from the retracted position. In this way, the wheel structure 3 can always maintain sliding contact with the sliding rail, effectively avoiding derailment caused by the jumping of the door / window sash, and improving the stability and safety of door / window sliding. In addition, this load-bearing sliding roller can adapt to different specifications and types of door and window sashes and sliding rails. By adjusting the elastic coefficient and initial state parameters of the elastic element 4, it can meet the usage requirements under different working conditions. It has strong versatility and adaptability, making it easy to promote and apply in the market.

[0027] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the first housing 1 is provided with a sliding shaft 11, and the second housing 2 is provided with a sliding groove 21. The extension direction of the sliding groove 21 is inclined to the horizontal direction, and the sliding shaft 11 and the sliding groove 21 are slidably connected. Thus, firstly, due to the inclined arrangement of the sliding groove 21, this connection provides a more stable guiding effect for the second housing 2. Compared to a simple connection in the horizontal or vertical direction, the inclined sliding groove 21 can better restrict the swaying of the second housing 2 in multiple directions, making the movement of the entire load-bearing sliding roller more stable during horizontal sliding. This reduces additional friction and noise caused by structural loosening or swaying, and improves the smoothness and comfort of sliding the door and window sashes. Secondly, due to the inclined extension of the sliding groove 21, the movement trajectory of the sliding shaft 11 within the sliding groove 21 is along the inclined direction. This inclined movement allows the second housing 2 to move downward more precisely in the predetermined direction when driven by the elastic element 4. Compared with horizontal or vertical sliding connections, the inclined sliding groove 21 can more effectively convert the elastic force of the elastic element 4 into the downward movement power of the second housing 2, reducing energy loss during transmission. This allows the second housing 2 to respond more quickly to the action of the elastic element 4 and move downward in time so that the wheel structure 3 always fits the slide rail, thereby avoiding derailment more quickly and improving the load-bearing sliding wheel's ability to cope with door and window sash jumping. Thirdly, different usage environments and door / window sash specifications may lead to differences in the forces and motion states experienced by the door / window sash during sliding. The inclined sliding groove 21 design makes the load-bearing sliding wheel more adaptable. When the door / window sash is subjected to a large external impact or slides on slide rails with different inclination angles, the sliding shaft 11 can automatically adjust the relative position of the second housing 2 and the first housing 1 by sliding within the inclined sliding groove 21, so that the wheel structure 3 always maintains good contact with the slide rail. This adaptive adjustment capability enables the load-bearing sliding wheel to work stably under various complex working conditions. Regardless of the size or direction of the door / window sash's bounce, the wheel structure 3 can remain on the slide rail by the flexible movement of the sliding shaft 11 within the sliding groove 21, greatly improving the versatility and practicality of the load-bearing sliding wheel.

[0028] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, at least two sliding shafts 11 and sliding grooves 21 are provided, and at least two sliding shafts 11 and sliding grooves 21 are distributed at intervals along the length direction of the first housing 1 and the second housing 2.

[0029] It should be noted that in some other embodiments, the sliding shaft 11 can also be disposed in the second housing 2, and the sliding groove 21 can be disposed in the first housing 1 accordingly. The choice can be made according to actual needs, and no single limitation is made here.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the first housing 1 is fitted onto the second housing 2, the sliding shaft 11 is disposed on the first housing 1, and the sliding groove 21 is disposed on the second housing 2. Thus, firstly, the fitted structure makes full use of space, reducing unnecessary volume occupation. In situations where space at the bottom of the door / window sash is limited, this compact structure can better adapt to the installation environment, avoiding interference with other components due to its excessive size, improving space utilization, and making the overall design of the door / window sash more rational and aesthetically pleasing. Secondly, from an assembly perspective, the structure of the first housing 1 fitted onto the second housing 2, with the sliding shaft 11 and sliding groove 21 respectively disposed on both, makes the assembly process simpler and faster. Only by accurately fitting the first housing 1 onto the second housing 2 and ensuring that the sliding shaft 11 smoothly enters the sliding groove 21 can the initial connection be completed, reducing assembly steps and difficulty.

[0031] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in one embodiment, the load-bearing sliding wheel further includes an adjustment component 5, which is connected to the elastic element 4. The adjustment component 5 is used to adjust the elastic force applied by the elastic element 4 to the second housing 2. Thus, firstly, different specifications of door and window sashes have significantly different weights, ranging from lightweight aluminum alloy doors and windows to heavier solid wood doors and windows, requiring drastically different elastic support forces for the load-bearing sliding wheel. The adjustment component 5 connects to the elastic element 4 and can adjust its elastic force, allowing the sliding wheel to be precisely adapted to the actual weight of the door and window sash. By adjusting the elastic force of the elastic element 4 through the adjustment component 5, it can be ensured that the second housing 2 remains stably in the retracted position when subjected to pressure from the door and window sash, and simultaneously, when the door and window sash bounces, it can quickly drive the second housing 2 downward to make the wheel structure 3 conform to the slide rail. Secondly, appropriate elastic force ensures optimal contact pressure between the wheel structure 3 and the slide rail. Excessive elastic force increases friction between the wheel structure 3 and the slide rail, making sliding of the door / window sash difficult and generating significant noise. Insufficient elastic force may prevent the wheel structure 3 from tightly fitting the slide rail, leading to jumping and derailment. The adjusting component 5 precisely adjusts the elastic force of the elastic element 4, ensuring the contact pressure between the wheel structure 3 and the slide rail is within the ideal range, thereby reducing sliding friction, lowering noise, and improving the smoothness and comfort of sliding the door / window sash. Thirdly, mismatched elastic force between the elastic element 4 and actual requirements can lead to unreasonable force distribution among the components of the sliding wheel, accelerating wear. For example, excessive elastic force may increase friction between the sliding shaft 11 and the sliding groove 21, causing accelerated wear. Insufficient elastic force may increase the impact force between the wheel structure 3 and the slide rail, damaging both. The adjusting component 5 precisely adjusts the elastic force according to actual conditions, making the force distribution among components more reasonable, reducing wear, and extending the product's lifespan.

[0032] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, in one embodiment, the adjusting assembly 5 includes an adjusting rod 51 and a connecting block 52. The adjusting rod 51 is rotatably mounted on the first housing 1, and the connecting block 52 is screwed onto the adjusting rod 51. When the adjusting rod 51 rotates, the connecting block 52 moves along the axial direction of the adjusting rod 51. The first end 41 of the elastic element 4 abuts against the connecting block 52, and the second end 42 of the elastic element 4 abuts against the second housing 2. Thus, in the first aspect, this threaded connection means that for every certain angle the adjusting rod 51 rotates, the connecting block 52 will produce a precise displacement along the axial direction of the adjusting rod 51. By precisely controlling the rotation angle of the adjusting rod 51, a small and precise adjustment of the position of the connecting block 52 can be achieved. Since the first end 41 of the elastic element 4 abuts against the connecting block 52, the change in the position of the connecting block 52 will directly cause a change in the degree of compression or tension of the elastic element 4, thereby precisely adjusting the elastic force applied by the elastic element 4 to the second housing 2. This high-precision adjustment method can meet the subtle differences in the elastic force of the sliding rollers required by different door and window systems, ensuring that the sliding rollers can provide just the right support and cushioning under various working conditions. Secondly, the connecting block 52 is screwed to the adjusting rod 51. This connection method has high structural stability, and the elastic force can be adjusted simply by rotating the adjusting rod 51, making operation simple and convenient. During the rotation of the adjusting rod 51, the threaded engagement between the connecting block 52 and the adjusting rod 51 ensures that the connecting block 52 moves smoothly along the axial direction without shaking or jamming. The first end 41 of the elastic element 4 is stably abutted against the connecting block 52, and the second end 42 is abutted against the second housing 2, so that the elastic force can be stably transmitted to the second housing 2. Even if the door and window sash slides frequently or is subjected to a large external impact, this stable structure can ensure that the transmission of the elastic force is not affected, ensuring the normal operation of the sliding wheel.

[0033] like Figure 6 and Figure 7 As shown, in one embodiment, the connecting block 52 includes an abutting part 521 and a connecting post 522 connected to each other. The connecting post 522 and the adjusting rod 51 are screwed together. The elastic member 4 is sleeved on the connecting post 522, and the first end 41 of the elastic member 4 abuts against the abutting part 521.

[0034] In one embodiment, the elastic element 4 is a spring.

[0035] It should be noted that in some other embodiments, the elastic element 4 may also be, but is not limited to, elastic rubber or elastic silicone, etc., and can be selected according to actual needs. There is no single limitation here.

[0036] It should be noted that in some other embodiments, the adjusting component 5 may also be, but is not limited to, a telescopic rod structure, a cam slider structure, or a gear rack structure, etc., whichever is selected according to actual needs, and is not limited to here.

[0037] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in one embodiment, the adjusting component 5 further includes a gasket 53, which is disposed on the second housing 2, and the second end 42 of the elastic member 4 abuts against the gasket 53. Thus, firstly, during repeated compression and stretching, the end of the elastic member 4 will rub against the contacting component; without the gasket 53, the elastic member 4 would directly contact the second housing 2, causing wear to the surface of the second housing 2 after long-term use. The gasket 53 is typically made of wear-resistant and corrosion-resistant materials, such as a metal gasket 53 or a plastic gasket 53, which can withstand the friction of the elastic member 4, reduce wear on the second housing 2, and extend the service life of the second housing 2. Secondly, the gasket 53 can also protect the elastic member 4; in some cases, the surface of the second housing 2 may have sharp edges or burrs, which may scratch the elastic member 4, causing cracks or breakage. The gasket 53 can cover the surface of the second housing 2, isolating the elastic member 4 from the sharp parts, preventing damage to the elastic member 4, and ensuring the normal use and stable performance of the elastic member 4. Thirdly, the gasket 53 is disposed on the second housing 2, and the second end 42 of the elastic member 4 abuts against the gasket 53. When the elastic member 4 applies elastic force, the gasket 53 can evenly distribute the elastic force to the contact surface of the second housing 2. Compared with the elastic member 4 directly abutting against the second housing 2, this method avoids the problem of uneven force on the second housing 2 due to uneven contact surface or local stress concentration.

[0038] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in one embodiment, the adjusting assembly 5 further includes a limiting ring 54. A limiting ring groove 514 is provided on the periphery of the adjusting rod 51. The limiting ring 54 is disposed in the first housing 1 and engaged in the limiting ring groove 514 to limit the axial displacement of the adjusting rod 51. Thus, during the adjustment of the elastic force of the elastic element 4, the adjusting rod 51 needs to rotate around its own axis. Without effective axial limiting measures, the adjusting rod 51 may experience axial displacement due to external forces (such as vibrations from sliding doors and windows, improper force during operation, etc.) during rotation. This axial movement can cause unexpected changes in the position of the connecting block 52, leading to fluctuations in the compression or tension of the elastic element 4, affecting the accuracy and stability of the elastic force adjustment. The limiting ring 54, engaged in the limiting ring groove 514 of the adjusting rod 51, effectively limits the axial displacement of the adjusting rod 51, ensuring that the adjusting rod 51 can only rotate around its own axis, thereby preventing unexpected changes in the position of the connecting block 52 and making the adjustment process more stable and reliable.

[0039] like Figure 3 , Figure 5 and Figure 6 As shown, in one embodiment, the second housing 2 is provided with a limiting block 23, which limits the axial movement of the connecting block 52 on the adjusting rod 51. During the process of the adjusting rod 51 rotating and driving the connecting block 52 to move axially to adjust the elastic force, without a limiting measure, the connecting block 52 may disengage from the adjusting rod 51 due to excessive movement. Once the connecting block 52 disengages, the adjusting component 5 will lose its adjusting function, and the load-bearing sliding wheel will not work properly, potentially causing the door and window sash to slide poorly, jam, or even fall off, damaging the door and window system. The limiting block 23 effectively prevents the connecting block 52 from disengaging from the adjusting rod 51, ensuring that the adjusting component 5 and the entire load-bearing sliding wheel are always in normal working condition, thus guaranteeing the safe operation of the door and window system. Furthermore, the limiting block 23 provides the operator with a clear adjustment boundary, so that the operator does not have to worry about the connecting block 52 coming off when adjusting the elastic force, making the operation easier and more convenient. The operator only needs to adjust the connecting block 52 within the stroke range limited by the limiting block 23 to quickly achieve the required elastic force, which improves the adjustment efficiency and saves time and effort.

[0040] It should be noted that in some other embodiments, the limiting block 23 can also be provided on the first housing 1, or the first housing 1 and the second housing 2 can both be provided with limiting blocks 23, and the two limiting blocks 23 are located at both ends of the connecting block 52 to limit the movement of the connecting block 52. The choice can be made according to actual needs, and no single limitation is made here.

[0041] like Figure 3 and Figure 8As shown, in one embodiment, the wheel structure 3 includes a wheel body 31 and a wheel seat 32. The wheel seat 32 is disposed on the second housing 2, and the wheel body 31 is disposed on the wheel seat 32. The wheel body 31 is provided with a first groove 311, and the wheel seat 32 is provided with a second groove 321. Both the first groove 311 and the second groove 321 are used for sliding connection with the slide rail. The width of the first groove 311 is smaller than the width of the second groove 321, and the second groove 321 can further prevent derailment. In this way, the first groove 311 on the wheel body 31 directly contacts and slides with the slide rail. Its relatively narrow width design can more accurately fit the shape and size of the slide rail, providing precise guidance for the sliding of the wheel body 31. This allows the wheel body 31 to slide stably along a predetermined path on the slide rail, reducing shaking and deviation caused by inaccurate guidance. Especially when the door and window sash slides in a straight line, it can ensure the straightness of the sliding and improve the smoothness of the sliding. Furthermore, the second groove 321 provides double protection against the sliding of the wheel body 31. When the connection between the first groove 311 and the slide rail becomes loose or deviates due to certain reasons (such as being subjected to a large external impact or unevenness of the slide rail surface), the second groove 321 can promptly function to continue to restrict the position of the wheel body 31 relative to the slide rail, preventing the wheel body 31 from completely detaching from the slide rail. This double protection mechanism greatly improves the anti-derailment performance of the wheel structure 3 and enhances the safety of the door and window sash during use.

[0042] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the second housing 2 is provided with a guide groove 22 extending vertically, and a portion of the neck 512 of the adjusting rod 51 is movably disposed within the guide groove 22.

[0043] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in one embodiment, the adjusting rod 51 includes a head 511, a neck 512 and a rod portion 513 connected in sequence. A portion of the neck 512 is rotatably disposed in the first housing 1, and a portion of the neck 512 is located in the guide groove 22. The rod portion 513 is threadedly connected to the connecting block 52.

[0044] like Figure 3 As shown, in one embodiment, the first housing 1 is provided with a rotating hole 12, and a portion of the neck 512 is rotatably disposed in the rotating hole 12.

[0045] like Figure 3 As shown, in one embodiment, the first housing 1 is provided with a shaft hole 13, and the sliding shaft 11 is disposed in the shaft hole 13.

[0046] In addition, this application also provides a door and window system, including a load-bearing sliding wheel as described in any of the above embodiments, and further including a door / window sash (not shown) and a slide rail (not shown). A first housing 1 is connected to the bottom of the door / window sash, and the wheel structure 3 is slidably disposed on the slide rail. This door and window system has the advantages of the load-bearing sliding wheel as described in any of the above embodiments, which will not be elaborated here.

[0047] In summary, the load-bearing sliding wheel and the door and window system including it disclosed in this utility model can bring at least the following beneficial technical effects: (1) When the door and window sash does not collide with other components, the door and window sash and the slide rail exert a large pressure on the first housing 1 and the second housing 2, and can overcome the elastic force of the elastic element 4, so that the elastic element 4 is compressed, thereby keeping the second housing 2 in the retracted position relative to the first housing 1, and the wheel structure 3 slides normally at this time. (2) When the door and window sash collides with the damping structure or other components such as the door and window frame, the door and window sash jumps upward. At this time, the elastic element 4 restores its deformation and drives the second housing 2 to move downward relative to the first housing 1 from the folded position. In this way, the wheel structure 3 can always keep sliding and attached to the slide rail, effectively avoiding the derailment caused by the jumping of the door and window sash. (3) The inclined sliding groove 21 can better limit the swaying of the second housing 2 in multiple directions, making the entire load-bearing sliding wheel move more smoothly during horizontal sliding, reducing the additional friction and noise caused by structural loosening or swaying. (4) The adjusting component 5 is connected to the elastic element 4 and its elastic force can be adjusted so that the sliding wheel can be accurately adapted to the actual weight of the door and window sash. By adjusting the elastic force of the elastic element 4 through the adjusting component 5, it can be ensured that the second housing 2 can be stably in the closed position when subjected to the pressure of the door and window sash. At the same time, when the door and window sash jumps, it can quickly drive the second housing 2 to move downward so that the wheel structure 3 fits the slide rail.

[0048] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A load-bearing sliding wheel, characterized in that, include: First shell (1); The second housing (2) is movably connected to the first housing (1); A wheel structure (3) is disposed in the second housing (2); An elastic element (4) is disposed between the first housing (1) and the second housing (2). The elastic element (4) is configured to apply an elastic force to the second housing (2). When the pressure on the first housing (1) and the second housing (2) can overcome the elastic force of the elastic element (4), the second housing (2) is in a closed position relative to the first housing (1). When the pressure on the first housing (1) and the second housing (2) fails to overcome the elastic force of the elastic element (4), the elastic element (4) drives the second housing (2) to move downward relative to the first housing (1) from the closed position.

2. The load-bearing sliding wheel according to claim 1, characterized in that, One of the first housing (1) and the second housing (2) is fixedly provided with a sliding shaft (11), and the other is provided with a sliding groove (21). The extension direction of the sliding groove (21) is inclined to the horizontal direction, and the sliding shaft (11) and the sliding groove (21) are slidably connected.

3. The load-bearing sliding wheel according to claim 2, characterized in that, The first housing (1) is sleeved on the second housing (2), the sliding shaft (11) is disposed on the first housing (1), and the sliding groove (21) is disposed on the second housing (2).

4. The load-bearing sliding wheel according to any one of claims 1-3, characterized in that, The load-bearing pulley also includes an adjustment component (5), which is connected to the elastic element (4). The adjustment component (5) is used to adjust the elastic force applied by the elastic element (4) to the second housing (2).

5. The load-bearing sliding wheel according to claim 4, characterized in that, The adjustment assembly (5) includes an adjustment rod (51) and a connecting block (52). The adjustment rod (51) is rotatably disposed on the first housing (1), and the connecting block (52) is screwed to the adjustment rod (51). When the adjustment rod (51) rotates, the connecting block (52) moves along the axial direction of the adjustment rod (51). The first end (41) of the elastic element (4) abuts against the connecting block (52), and the second end (42) of the elastic element (4) abuts against the second housing (2).

6. The load-bearing sliding wheel according to claim 5, characterized in that, The adjustment assembly (5) further includes a gasket (53), which is disposed in the second housing (2), and the second end (42) of the elastic member (4) abuts against the gasket (53).

7. The load-bearing sliding wheel according to claim 5, characterized in that, The adjustment assembly (5) further includes a limiting ring (54). A limiting ring groove (514) is provided on the periphery of the adjustment rod (51). The limiting ring (54) is disposed on the first housing (1) and engaged with the limiting ring groove (514) to limit the axial displacement of the adjustment rod (51).

8. The load-bearing sliding wheel according to claim 5, characterized in that, The first housing (1) and / or the second housing (2) are provided with a limiting block (23) for limiting the axial movement of the connecting block (52) in the adjusting rod (51).

9. The load-bearing sliding wheel according to claim 1, characterized in that, The wheel structure (3) includes a wheel body (31) and a wheel seat (32). The wheel seat (32) is disposed on the second housing (2), and the wheel body (31) is disposed on the wheel seat (32). The wheel body (31) is provided with a first groove (311), and the wheel seat (32) is provided with a second groove (321). Both the first groove (311) and the second groove (321) are used for sliding connection with the slide rail. The width of the first groove (311) is smaller than the width of the second groove (321).

10. A door and window system, characterized in that, The device includes the load-bearing sliding wheel as described in any one of claims 1-9, and also includes a door / window sash and a slide rail, wherein the first housing (1) is connected to the bottom of the door / window sash, and the wheel structure (3) is slidably disposed on the slide rail.

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