Adjustable pulley device and door and window

Abstract

The utility model relates to door and window accessory technical field, concretely relates to adjustable pulley device and door and window. Adjustable pulley device includes: the frame that is long strip shape setting, at least one pulley module is arranged in the frame along the length direction, the both ends of frame all are provided with the limit block, and the pulley module includes the support frame sliding connection with the frame, and the opposite sides of support frame along the length direction of frame are provided with the guide inclined plane respectively, when the pulley module sets up for two and above, the third guide piece is arranged between adjacent pulley module, and the third guide piece respectively with the guide inclined plane line contact, and with the bottom line contact of frame. Adopt above -mentioned mode, can adjust the height of pulley module after the door and window are installed into the frame body, to promote the cooperation degree with the slide rail at the frame body, promote the fluency and security when using.

Description

Technical Field

[0001] This utility model relates to the field of door and window accessories technology, and in particular to an adjustable pulley device and a door / window. Background Technology

[0002] Sliding doors and windows are widely used in homes due to their flexible opening and small footprint. Pulley mechanisms, for example, are fixed to the bottom of the sliding door / window sash and work in conjunction with the lower guide rail in the door or window frame to ensure the opening and closing of the sliding door / window.

[0003] As the operating and load-bearing components of sliding doors, the pulley system determines the stability and safety of sliding doors and windows. During the installation of doors and windows, a certain amount of slack is usually allowed between the door / window and the frame to facilitate loading. If this slackness is too great during use, it can easily cause uneven stress on the pulley system, resulting in poor operation, or even derailment, increasing safety hazards.

[0004] To address the aforementioned issues, the current design incorporates an adjustable mechanism to better adapt the pulley system to doors and windows, enabling relative sliding. However, the current method of adjusting the pulley system typically involves surface contact, resulting in high friction during adjustment. Furthermore, dust ingress can cause the system to jam, leading to adjustment failure and poor stability. Utility Model Content

[0005] The technical problem to be solved by this utility model embodiment is to provide an adjustable pulley device that can adjust the height of the pulley module after the door or window is installed in the frame, so as to improve the fit with the slide rail at the frame and improve the smoothness and stability of adjustment during use.

[0006] This utility model discloses an adjustable pulley device, comprising: a long strip-shaped frame, wherein at least one pulley module is arranged along the length direction within the frame, and limit blocks are provided at both ends of the frame;

[0007] The pulley module includes a support frame that is slidably connected to the frame, and the support frame has guide slopes on opposite sides along the length of the frame.

[0008] When the pulley module is set to one, a second guide is provided between the two limiting blocks and the pulley module, and the second guide is in contact with the corresponding guide slope line respectively;

[0009] When the pulley module is set to two or more, a third guide is provided between adjacent pulley modules, and the third guide contacts the guide ramps on both sides and the bottom line of the frame respectively.

[0010] The pulley module can protrude or retract a certain distance from the frame.

[0011] Optionally, the limiting block is provided with a second guide groove corresponding to the pulley module, and the second guide member abuts between the second guide groove and the guide inclined surface.

[0012] Optionally, the third guide and the second guide are circular cylinders, and their arc surfaces abut against the guide ramp and the bottom of the frame, respectively.

[0013] Optionally, the pulley module further includes a roller or bearing rotatably connected to the support frame. The support frame includes parallel support plates, the roller or bearing is located between the two support plates, and a portion of the roller or bearing is exposed above the frame.

[0014] Optionally, the pulley module further includes a buffer pad disposed between the support plates. The buffer pad is located on opposite sides of the roller or the bearing in the radial direction, and the buffer pad is provided with an arc-shaped groove for cooperating with the track of the frame.

[0015] Optionally, one side of the frame opening is provided with an inwardly bent edge, which can be engaged with the support plate.

[0016] Optionally, the frame is integrally bent into shape.

[0017] This utility model discloses an adjustable pulley device, comprising: a long strip-shaped frame, at least one pulley module arranged along the length direction inside the frame, a slider and a limiting block respectively arranged at both ends of the frame, the slider being able to slide relative to the frame, and an adjusting member arranged at one end of the frame, the adjusting member being connected to the slider.

[0018] The pulley module includes a support frame that is slidably connected to the frame, and the support frame has guide slopes on opposite sides along the length of the frame.

[0019] When the pulley module is set to one, a first guide is provided between the slider and the pulley module, and a second guide is provided between the limiting block and the pulley module. The first guide and the second guide are respectively in contact with the corresponding guide slope line.

[0020] When the pulley module is set to two or more, a third guide is provided between adjacent pulley modules, and the third guide contacts the guide ramps on both sides and the bottom line of the frame respectively.

[0021] When the adjusting component drives the slider to slide relative to the frame, the pulley module can protrude out of or retract a certain distance from the frame.

[0022] Optionally, the slider includes a first guide groove corresponding to the pulley module, and a first guide member is provided between the slider and the adjacent pulley module, the first guide member abutting between the first guide groove and the guide inclined surface.

[0023] Optionally, the slider includes a threaded hole corresponding to the adjusting member, and the adjusting member is connected to the slider through the threaded hole.

[0024] Optionally, the adjusting member includes a force-applying part, a connecting part, and a threaded part connected in sequence. The diameter of the connecting part is smaller than the diameter of the threaded part. A limiting piece is also provided in the frame. The limiting piece is held on the connecting part to limit the adjusting member.

[0025] This utility model discloses an adjustable pulley device, comprising: a long strip-shaped frame, at least one pulley module arranged along the length direction inside the frame, a slider and a limiting block respectively arranged at both ends of the frame, and the slider being able to slide relative to the frame;

[0026] The pulley module includes a support frame that is slidably connected to the frame, and the support frame has guide slopes on opposite sides along the length of the frame.

[0027] When the pulley module is set to one, a first guide is provided between the slider and the pulley module, and a second guide is provided between the limiting block and the pulley module. The first guide and the second guide are respectively in contact with the corresponding guide slope line.

[0028] When the pulley module is set to two or more, a third guide is provided between adjacent pulley modules, and the third guide contacts the guide ramps on both sides and the bottom line of the frame respectively.

[0029] The pulley module can protrude or retract a certain distance from the frame.

[0030] Optionally, an adjusting member is provided at one end of the frame, and the adjusting member is connected to the slider; when the adjusting member drives the slider to slide relative to the frame, the pulley module can protrude out or retract a certain distance from the frame.

[0031] This utility model discloses an adjustable pulley device, comprising: a door or window, characterized in that it includes a frame with a track, a wing of the door or window, and the aforementioned adjustable pulley device, wherein the wing is connected to the track of the frame via the adjustable pulley device.

[0032] Compared with the prior art, the adjustable pulley device provided by this utility model has the following advantages: By providing at least one pulley module along the length of the frame, when there is only one pulley module, the adjustment and sliding of the pulley module are achieved through the cooperation of the first and second guide members. When there are two or more pulley modules, a third guide member is provided between adjacent pulley modules. When the slider slides relative to the frame, it squeezes the pulley modules, compressing the distance between them. At this time, the third guide member moves relative to the guide slope, achieving both the reduction of the distance between the pulley modules and their protrusion from the frame. This helps ensure the stability of the doors and windows when they are pushed and pulled after installation. Furthermore, when the pulley module protrudes or retracts from the frame, the third guide member contacts the guide slope lines on both sides and the bottom line of the frame. This three-point support method helps ensure stable support, and the line contact helps reduce the friction of the pulley modules during movement, thereby reducing the difficulty of adjustment and sliding. By adopting the above solution, when the adjustable pulley device is connected to the door and window, the fit with the slide rail at the frame is improved, and the smoothness and stability of the adjustment during use are enhanced. Attached Figure Description

[0033] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the adjustable pulley device provided in an embodiment of the present invention;

[0035] Figure 2 This is a cross-sectional schematic diagram of the adjustable pulley device provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the pulley module provided in an embodiment of the present invention;

[0037] Figure 4 This is an exploded view of the frame and slider provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the limiting block and the second guide member in cooperation according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the third guide member provided in this embodiment of the present invention, which is respectively engaged with the frame and the pulley module;

[0040] Figure 7 This is a cross-sectional schematic diagram of an adjustable pulley device with two limit stops provided in an embodiment of the present invention;

[0041] Figure 8 This is a cross-sectional schematic diagram of an adjustable pulley device without adjustment components provided in an embodiment of this utility model;

[0042] Figure 9 This is a schematic diagram of the structure of an adjustable pulley device with a first slider and a second slider respectively provided at both ends, according to an embodiment of the present invention.

[0043] Figure 10 This is a cross-sectional schematic diagram of an adjustable pulley device with a first adjusting member and a second adjusting member respectively at both ends, provided in an embodiment of the present utility model.

[0044] The labels for the attached figures are as follows:

[0045] 100. Adjustable pulley device; 110. Frame; 112. Folded edge; 120. Pulley module; 122. Guide slope; 124. Support plate; 126. Roller; 128. Buffer pad; 1282. Arc groove; 130. Adjusting component; 132. Force application part; 134. Connecting part; 136. Threaded part; 140. Slider; 142. First guide groove; 144. Limiting groove; 150. Third guide component; 160. First guide component; 170. Limiting block; 172. Second guide groove; 180. Second guide component; 190. Limiting piece; 211. First slider; 212. Second slider; 221. First adjusting component; 222. Second adjusting component. Detailed Implementation

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0047] like Figure 1 , Figure 2 and Figure 3 , Figure 7 and Figure 8As shown, this utility model embodiment provides an adjustable pulley device 100, including: a long strip-shaped frame 110, with at least one pulley module 120 arranged along the length direction inside the frame 110, and limit blocks 170 provided at both ends of the frame 110; the pulley module 120 includes a support frame slidably connected to the frame 110, and guide slopes 122 are respectively provided on opposite sides of the support frame along the length direction of the frame 110; when there is one pulley module 120, a second guide member 180 is provided between the two limit blocks 170 and the pulley module 120, and the second guide member 180 is in line contact with the corresponding guide slope 122; when there are two or more pulley modules 120, a third guide member 150 is provided between adjacent pulley modules 120, and the third guide member 150 is in line contact with the guide slopes 122 on both sides and in line contact with the bottom of the frame 110; the pulley module 120 can protrude or retract a certain distance from the frame 110.

[0048] When there are two or more pulley modules 120, a third guide 150 is added in addition to the two second guide members 180. During use, all pulley modules 120 retract under force after contacting the outer frame. Due to the mutual compression of the second guide members 180 and the third guide members 150, each pulley module 120 retracts in a coordinated manner and is on the same horizontal line. This ensures that each pulley module 120 can contact the outer frame and receive force evenly, achieving balanced force distribution and preventing a single pulley module 120 from bearing excessive force, which could damage the pulley module 120 or even the entire module.

[0049] Furthermore, such as Figure 1 , Figure 2 and Figure 3 , Figure 7 and Figure 8As shown, this utility model embodiment provides an adjustable pulley device 100, including: a slider 140 and a limiting block 170 respectively provided at both ends of a frame 110, and the slider 140 is slidable relative to the frame 110; a pulley module 120 includes a support frame slidably connected to the frame 110, and guide inclined surfaces 122 are respectively provided on opposite sides of the support frame along the length direction of the frame 110; when the pulley module 120 is set as one, a first guide member 16 is provided between the slider 140 and the pulley module 120. A second guide 180 is provided between the limiting block 170 and the pulley module 120. The first guide 160 and the second guide 180 respectively contact the corresponding guide slope 122 lines. When there are two or more pulley modules 120, a third guide 150 is provided between adjacent pulley modules 120, and the third guide 150 respectively contacts the guide slope 122 lines on both sides and the bottom line of the frame 110. The pulley module 120 can protrude or retract a certain distance from the frame 110. In this embodiment, compared with the above solution, one limiting block 170 is replaced by a slider 140. The slider 140 can actively or passively adjust the maximum horizontal movement distance of all pulley modules 120, thereby satisfying the final protrusion height of the pulley module 120 from the frame 110.

[0050] Specifically, the elongated frame 110 allows for the installation of more pulley modules 120, which helps ensure the reliability of the door and window fit. In practical applications, the length of the frame 110 can be flexibly adjusted according to the size of the door and window. In optional embodiments of this application, the pulley module 120 can be set to one to six, which improves the convenience of installation and adjustment.

[0051] Preferably, refer to Figure 1 and Figure 2An adjusting member 130 is provided at one end of the frame 110 to enable active adjustment of the slider 140. The adjusting member 130 is connected to the slider 140, and the adjusting member 130 drives the slider 140 to slide relative to the frame 110. When the adjusting member 130 is not provided, the slider 140 and the pulley module 120 automatically slide and adjust under the action of gravity or external force. The purpose is to make the force on each pulley module 120 more balanced when it is in direct contact with the outside. When the adjusting member 130 is provided, by adjusting the position of the slider 140, on the one hand, the position of the pulley module 120 is adjusted, that is, the vertical position, that is, the distance of the part protruding or retracting from the frame 110. On the other hand, the position of the slider 140 can also be adjusted to adjust the extreme position of the pulley module 120 retracting into the frame 110. In fact, it can also be regarded as the slider 140 being adjusted after the adjusting member 130 is used to adjust the position of the slider 140 and then no further adjustment is made, so that the slider 140 is regarded as having no adjusting member 130. Of course, if the slider 140 is passively adjusted, the friction of the slider 140 is adjusted to provide resistance to the sliding of the pulley module 120, so that each pulley module 120 slowly forms a level state, avoiding the pulley module 120 from adjusting too quickly and becoming uneven.

[0052] When there is only one pulley module 120, the slider 140 and the limiting block 170 only need to cooperate to limit the pulley module 120. To ensure the smoothness of pushing the pulley module 120 out of or into the frame 110, a first guide 160 is provided between the slider 140 and the pulley module 120, and a second guide 180 is provided between the limiting block 170 and the pulley module 120 to achieve the required cooperation. When there are two or more pulley modules 120, a third guide 150 is also required between adjacent pulley modules 120 to ensure that the adjusting force of the current pulley module 120 is smoothly transmitted to the adjacent pulley modules 120. In addition, by having the first guide member 160 and the second guide member 180 contact the corresponding guide slope 122 lines respectively, and the third guide member 150 contact the guide slope 122 lines on both sides respectively, and contact the bottom line of the frame 110, it is beneficial to reduce the friction between them and provide stable support for the pulley module 120.

[0053] The adjustable pulley device 100 provided in this application embodiment uses at least one pulley module 120 arranged along the length direction within the frame 110. When there is only one pulley module 120, the pulley module 120 is adjusted through the cooperation of the first guide member 160 and the second guide member 180. When there are two or more pulley modules 120, a third guide member 150 is arranged between adjacent pulley modules 120. When the slider 140 is adjusted relative to the frame 110 by the adjusting member 130 at one end of the frame 110, the slider 140 presses against the pulley modules 120, compressing the distance between the pulley modules 120. At this time, the third guide member 150 moves relative to the guide slope 122, so that the distance between the pulley modules 120 is reduced while protruding a certain distance from the frame 110. After the door and window are installed, it can be adjusted to make the fit between the pulley module 120 and the frame tighter, which helps to ensure the stability of the door and window when it is pushed and pulled. Furthermore, when the pulley module 120 protrudes or retracts a certain distance from the frame 110, and the third guide member 150 contacts the guide ramps 122 on both sides and the bottom of the frame 110, this three-point support helps ensure stable support. The line contact also helps reduce friction during pulley module 120 movement, thus reducing adjustment difficulty. Using this solution, after connecting the adjustable pulley device 100 to the door or window, the height of the pulley module 120 can be adjusted via the adjusting member 130 after the door or window is installed in the frame. This improves the fit with the slide rails in the frame, enhancing the smoothness and safety of adjustment during use.

[0054] In addition, compared with the conventional use of guide grooves, it can avoid problems such as inconvenient installation, uneven force distribution and easy jamming. Moreover, through the cooperation of the first guide 160, the second guide 180 and the third guide 150, the overall installation is more convenient and quick, and the transmission is smoother.

[0055] In this embodiment, reference Figure 9 and Figure 10A preferred embodiment of the adjustable pulley device 100 is also provided, wherein a first slider 211 and a second slider 212 are respectively provided at both ends of the frame 110, and the first slider 211 is slidable relative to the frame 110; the pulley module 120 includes a support frame slidably connected to the frame 110, and guide inclined surfaces 122 are respectively provided on opposite sides of the support frame along the length direction of the frame 110; when the pulley module 120 is set as one, a first guide member 160 is provided between the first slider 211 and the pulley module 120. A second guide 180 is provided between the second slider 212 and the pulley module 120. The first guide 160 and the second guide 180 respectively contact the corresponding guide slope 122 line. When there are two or more pulley modules 120, a third guide 150 is provided between adjacent pulley modules 120. The third guide 150 contacts the guide slope 122 lines on both sides and the bottom line of the frame 110. The pulley module 120 can protrude or retract a certain distance from the frame 110.

[0056] Compared to the above scheme, this scheme mainly sets up two slider structures, namely the first slider 211 and the second slider 212. By replacing the limiting block 170 with the second slider 212, both ends of the frame 110 of the adjustable pulley device 100 are provided with slider structures. This double slider structure mainly improves the balance of left and right adjustment, makes the horizontal movement distance of each pulley module 120 close, and reduces the frictional wear between each pulley module 120 and the frame 110.

[0057] Furthermore, each slider structure can also be provided with a corresponding adjustment structure. Specifically, one end of the frame 110 is provided with a first adjustment member 221, which is connected to the first slider 211. When the first adjustment member 221 drives the first slider 211 to slide relative to the frame 110, the pulley module 120 can protrude or retract a certain distance from the frame 110. Additionally, one end of the frame 110 is provided with a second adjustment member 222, which is connected to the second slider 212. When the second adjustment member 222 drives the second slider 212 to slide relative to the frame 110, the pulley module 120 can protrude or retract a certain distance from the frame 110. Essentially, the first adjustment member 221 or the second adjustment member 222 can be provided individually, or both can be provided separately. The structure of the first adjustment member 221 and the second adjustment member 222 is consistent with the aforementioned adjustment members and will not be described in detail here.

[0058] like Figure 2 and Figure 4As shown, the slider 140 includes a first guide groove 142 corresponding to the pulley module 120, and a first guide member 160 is provided between the slider 140 and the adjacent pulley module 120. The first guide member 160 abuts against the first guide groove 142 and the guide inclined surface 122.

[0059] Specifically, when the slider 140 slides along the frame 110 toward the position of the pulley module 120, a force is applied to the first guide member 160 through the first guide groove 142, and the first guide member 160 then transmits the force to the guide ramp 122. The distance between the first guide groove 142 and the guide ramp 122 is compressed, and the force transmitted to the guide ramp 122 is decomposed into a component force parallel to the extension direction of the frame 110 and a component force perpendicular to the extension direction of the frame 110. Under the action of the above component forces, the pulley module 120 can protrude from the frame 110 by a certain distance.

[0060] The slider 140 includes a threaded hole corresponding to the adjusting member 130, and the adjusting member 130 is connected to the slider 140 through the threaded hole. When the adjusting member 130 rotates relative to the slider 140, the relative position between them changes. As the adjusting member 130 moves further into the slider 140, or as it is unscrewed from the slider 140, it causes the slider 140 to slide relative to the frame 110, thereby adjusting the pulley module 120. For example, when the adjusting member 130 is unscrewed from the threaded hole, the distance between the end of the slider 140 and the frame 110 increases, thus pushing the slider 140 to slide towards one side of the pulley module 120.

[0061] In addition, a limiting groove 144 is provided on the slider 140. The limiting groove 144 is elongated and parallel to the length direction of the frame 110. A pin corresponding to the limiting groove 144 can be provided on the frame 110 to pass through the limiting groove 144. This can guide the sliding of the slider 140 and also limit it, preventing the slider 140 from accidentally detaching from the frame 110 or tilting relative to the frame 110, so as to ensure the reliability of the transmission.

[0062] like Figure 2 and Figure 5 As shown, the limiting block 170 is provided with a second guide groove 172 corresponding to the pulley module 120, and a second guide member 180 is provided between the limiting block 170 and the adjacent pulley module 120. The second guide member 180 abuts against the second guide groove 172 and the guide inclined surface 122.

[0063] Specifically, by providing a second guide member 180 between the limiting block 170 and the adjacent pulley module 120, and when the second guide member 180 abuts against the second guide groove 172 and the guide slope 122, a force can be applied to the second guide member 180 via the second guide groove 172, and the second guide member 180 then transmits the force to the corresponding guide slope 122. In this way, the guide slope 122 on the pulley module 120 side near the limiting block 170 abuts against the second guide member 180, ensuring the smooth movement of the pulley module 120 when subjected to a force along the length of the frame 110, preventing the pulley module 120 from tilting and jamming during movement, and thus ensuring reliability during use.

[0064] In an optional embodiment of this application, the third guide 150, the first guide 160 and the second guide 180 are circular cylinders, and the arc surfaces of the circular cylinders abut against the bottom of the guide ramp 122 and the frame 110, respectively.

[0065] Specifically, the first guide member 160, the second guide member 180, and the third guide member 150 are circular cylinders, which simplifies the installation, reduces the failure rate, and ensures smooth linkage between the pulley modules 120 while providing stable support. Additionally, refer to... Figure 6 As shown, the third guide member 150 forms line contact at points A, B, and C, reducing friction while providing stable support, thus ensuring reliability during use. It is understood that the first guide member 160 can be integrally formed with the slider 140, and the second guide member 180 can be integrally formed with the limiting block 170, without affecting the transmission of force, achieving the same effect.

[0066] like Figure 3 As shown, the pulley module 120 also includes a roller 126 or a bearing that is rotatably connected to the support frame. The support frame includes parallel support plates 124. The roller 126 or the bearing is located between the two support plates 124, and a portion of the roller 126 or the bearing is exposed above the frame 110.

[0067] Specifically, the pulley module 120 can be rotatably connected to the support frame using either rollers 126 or bearings. Using bearings for the rotatable connection results in better noise reduction. Furthermore, to ensure a proper fit between the rollers 126 or bearings and the track on the frame, grooves can be provided on the outer circumference of the rollers 126 or bearings to prevent the pulley module 120 from accidentally slipping off the track. Additionally, the rollers 126 or bearings are located between the two support plates 124, which helps ensure stable support from the support plates 124, providing the necessary support strength. Simultaneously, the portion of the rollers 126 or bearings exposed above the frame 110 prevents accidental rubbing between the frame 110 and the slide rail, contributing to stability during engagement.

[0068] Please continue to refer to this. Figure 3 The pulley module 120 also includes a buffer pad 128 disposed between the support plates 124. The buffer pad 128 is located on opposite sides of the roller 126 or the bearing in the radial direction, and the buffer pad 128 is provided with an arc groove 1282 for cooperating with the track of the frame.

[0069] Specifically, the buffer pad 128 is located on opposite sides of the roller 126 or bearing radially. When the adjustable pulley device 100 is engaged with the track, the buffer pad 128 can fit tightly with the track through the arc-shaped groove 1282, which can effectively buffer and clean the track, preventing foreign objects from being drawn into the track and the pulley module 120, thus ensuring the smoothness and stability of the adjustment of the adjustable pulley device 100. In addition, the buffer pad 128 is provided with a T-shaped groove, which divides the buffer pad 128 into two ear plates with arc-shaped grooves 1282 spaced apart, and a transverse groove is formed above the arc-shaped grooves 1282, ensuring that the buffer pad 128 has a certain deformation space when the pulley module 120 is engaged with the track, thereby ensuring the reliability of the engagement and reducing the wear of the buffer pad 128.

[0070] like Figure 4 As shown, one side of the opening of the frame 110 is provided with an inwardly bent edge 112, which can be engaged with the support plate 124.

[0071] Specifically, the rollers 126 or bearings of the pulley module 120 extend from the opening and are limited by the inwardly bent edge 112 of the frame 110 to prevent the pulley module 120 from accidentally detaching from the frame 110.

[0072] In an optional embodiment of this application, the frame 110 is integrally bent into shape. This method helps ensure the consistency of the frame 110, improves its overall integrity and strength, and reduces production difficulty and costs.

[0073] like Figure 2 and Figure 4 As shown, the adjusting member 130 includes a force-applying part 132, a connecting part 134 and a threaded part 136 connected in sequence. The diameter of the connecting part 134 is smaller than the diameter of the threaded part 136. A limiting piece 190 is also provided inside the frame 110. The limiting piece 190 is held on the connecting part 134 and is used to limit the adjusting member 130.

[0074] Specifically, the force-applying portion 132 of the adjusting member 130 can be a bolt nut, which facilitates the use of common tools to adjust the adjusting member 130. The diameter of the connecting portion 134 is smaller than the diameter of the threaded portion 136, which is beneficial for limiting the threaded portion 136 by the limiting piece 190 when the threaded portion 136 is engaged with the threaded hole of the slider 140, preventing the threaded portion 136 from extending beyond the frame 110. During assembly, it is only necessary to pass the adjusting member 130 through the frame 110 and connect it to the slider 140, and then directly insert the limiting piece 190 into the connecting portion 134. The limiting piece 190 can adopt a U-shaped structure to facilitate its engagement with the connecting portion 134.

[0075] This utility model also discloses a door and window, including a frame with a track, a sash of a door or window, and the adjustable pulley device 100 of the foregoing embodiments. The sash is connected to the track of the frame via the adjustable pulley device 100. This door and window has the same structure and beneficial effects as the adjustable pulley device 100 of the foregoing embodiments. The structure and beneficial effects of the adjustable pulley device 100 have been described in detail in the foregoing embodiments and will not be repeated here.

[0076] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. An adjustable pulley device, characterized in that, include: A long, narrow frame is provided, with at least one pulley module arranged along the length of the frame, and limit blocks are provided at both ends of the frame. The pulley module includes a support frame that is slidably connected to the frame, and the support frame has guide slopes on opposite sides along the length of the frame. When the pulley module is set to one, a second guide is provided between the two limiting blocks and the pulley module, and the second guide is in contact with the corresponding guide slope line respectively; When the pulley module is set to two or more, a third guide is provided between adjacent pulley modules, and the third guide contacts the guide ramps on both sides and the bottom line of the frame respectively. The pulley module can protrude or retract a certain distance from the frame.

2. The adjustable pulley device according to claim 1, characterized in that, The limiting block is provided with a second guide groove corresponding to the pulley module, and the second guide member abuts between the second guide groove and the guide inclined surface.

3. The adjustable pulley device according to claim 2, characterized in that, The third guide and the second guide are circular cylinders, and their arc surfaces abut against the guide ramp and the bottom of the frame, respectively.

4. The adjustable pulley device according to any one of claims 1-3, characterized in that, The pulley module also includes rollers or bearings rotatably connected to the support frame. The support frame includes parallel support plates, the rollers or bearings are located between the two support plates, and a portion of the rollers or bearings is exposed above the frame.

5. The adjustable pulley device according to claim 4, characterized in that, The pulley module also includes a buffer pad disposed between the support plates. The buffer pad is located on opposite sides of the roller or the bearing in the radial direction, and the buffer pad is provided with an arc-shaped groove for cooperating with the track of the frame.

6. The adjustable pulley device according to claim 4, characterized in that, One side of the frame opening is provided with an inwardly bent edge, which can be engaged with the support plate.

7. The adjustable pulley device according to claim 1, characterized in that, The frame is integrally bent and formed.

8. An adjustable pulley device, characterized in that, include: A long, narrow frame has at least one pulley module arranged along its length. A slider and a limiting block are respectively provided at both ends of the frame, and the slider can slide relative to the frame. An adjusting member is provided at one end of the frame and is connected to the slider. The pulley module includes a support frame that is slidably connected to the frame, and the support frame has guide slopes on opposite sides along the length of the frame. When the pulley module is set to one, a first guide is provided between the slider and the pulley module, and a second guide is provided between the limiting block and the pulley module. The first guide and the second guide are respectively in contact with the corresponding guide slope line. When the pulley module is set to two or more, a third guide is provided between adjacent pulley modules, and the third guide contacts the guide ramps on both sides and the bottom line of the frame respectively. When the adjusting component drives the slider to slide relative to the frame, the pulley module can protrude out of or retract a certain distance from the frame.

9. The adjustable pulley device according to claim 8, characterized in that, The slider includes a first guide groove corresponding to the pulley module, and a first guide member is provided between the slider and the adjacent pulley module. The first guide member abuts against the first guide groove and the guide slope.

10. The adjustable pulley device according to claim 8, characterized in that, The slider includes a threaded hole corresponding to the adjusting member, and the adjusting member is connected to the slider through the threaded hole.

11. The adjustable pulley device according to claim 10, characterized in that, The adjusting component includes a force-applying part, a connecting part, and a threaded part connected in sequence. The diameter of the connecting part is smaller than the diameter of the threaded part. A limiting piece is also provided inside the frame. The limiting piece is held on the connecting part and used to limit the adjusting component.

12. An adjustable pulley device, characterized in that, include: A long, narrow frame has at least one pulley module arranged along its length inside the frame. A slider and a limiting block are respectively provided at both ends of the frame, and the slider can slide relative to the frame. The pulley module includes a support frame that is slidably connected to the frame, and the support frame has guide slopes on opposite sides along the length of the frame. When the pulley module is set to one, a first guide is provided between the slider and the pulley module, and a second guide is provided between the limiting block and the pulley module. The first guide and the second guide are respectively in contact with the corresponding guide slope line. When the pulley module is set to two or more, a third guide is provided between adjacent pulley modules, and the third guide contacts the guide ramps on both sides and the bottom line of the frame respectively. The pulley module can protrude or retract a certain distance from the frame.

13. The adjustable pulley device according to claim 12, characterized in that, An adjustment component is provided at one end of the frame, and the adjustment component is connected to the slider; when the adjustment component drives the slider to slide relative to the frame, the pulley module can protrude out of or retract a certain distance from the frame.

14. A door or window, characterized in that, The wing fan includes a frame, door, or window with a track, and an adjustable pulley device as described in any one of claims 1-13, wherein the wing fan is connected to the track of the frame via the adjustable pulley device.

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