CN219299064U - Pulley mechanism and door and window system - Google Patents

Abstract

The application relates to a pulley mechanism and a door and window system. The pulley mechanism includes: the shell, the both side walls of the shell are provided with the first mounting hole relatively and the first adjusting hole above the first mounting hole; the middle shell is arranged in the shell, and first through holes are oppositely formed in two side walls of the middle shell; the inner shell assembly is arranged in the middle shell and comprises a first inner shell and a first pulley connected with one end of the first inner shell, a second mounting hole and a third mounting hole are formed in the other end of the first inner shell at intervals, the first inner shell is connected with the outer shell through the first mounting hole, the first through hole and the second mounting hole, and the first inner shell is connected with the outer shell through the first adjusting hole, the first through hole and the third mounting hole; and an adjusting member configured to drive the middle case to move in a length direction thereof with respect to the outer case to rotate the first inner case with respect to the outer case. The pulley mechanism of this application is favorable to improving height-adjusting, improves door and window system's commonality.

Description

Pulley mechanism and door and window system

Technical Field

The application relates to the technical field of doors and windows, in particular to a pulley mechanism and a door and window system.

Background

In door and window systems, sliding doors and windows are increasingly favored by users due to the advantages of convenience in opening and closing, small occupied space and the like. The sliding door and window generally comprises a door and window, a sliding rail and a pulley mechanism, wherein the pulley is arranged at the bottom of the door and window, the sliding rail is arranged on the ground, and the door and window is arranged in the sliding rail through sliding of the pulley. Thus, the sliding function of the door and window is realized through the pulley.

In the related art, after the door and window with the pulley mechanism is installed, the pulley mechanism has small adjustment quantity in the height direction of the door and window and even can not be adjusted, so that the gap between the door and window and the door and window frame is out of tolerance, and the door and window is separated from the guide rail, so that the normal operation of the door and window is influenced.

Disclosure of Invention

Based on the above-mentioned problem, this application provides a pulley mechanism and door and window system to do benefit to the high adjustment volume that improves pulley mechanism, and then do benefit to the commonality that improves door and window system.

According to a first aspect of the present application, a pulley mechanism is presented for use in a door and window system. The pulley mechanism includes: an outer shell, a middle shell, an inner shell assembly and an adjusting piece. The two side walls of the shell are oppositely provided with first mounting holes and first adjusting holes above the first mounting holes. The middle shell is arranged inside the shell, and first through holes are oppositely formed in two side walls of the middle shell. The inner shell assembly is arranged in the middle shell and comprises a first inner shell and a first pulley connected with one end of the first inner shell. The other end interval of first inner shell is provided with second mounting hole and third mounting hole, first inner shell pass through first mounting hole first through-hole and the second mounting hole with the shell is connected, first inner shell still passes through first regulation hole first through-hole and the third mounting hole with the shell is connected. The adjustment member is configured to drive the middle shell to move in a length direction thereof relative to the outer shell to rotate the first inner shell relative to the outer shell.

According to the pulley mechanism, the adjusting piece drives the middle shell to move relative to the outer shell in the length direction, so that the first inner shell is driven to rotate in the range of the included angle, and the height of the pulley mechanism is adjusted. In addition, in the present embodiment, the height adjustment amount of the pulley mechanism depends not only on the magnitude of the rotation angle but also on the magnitude of the rotation radius. Therefore, the rotating radius and the rotating angle can be flexibly set according to actual conditions, so that the pulley mechanism with large adjustment quantity is realized, and the universality of a door and window system is improved.

In some embodiments, the two side walls of the housing are further provided with a fourth mounting hole and a second adjusting hole which are symmetrical to the first mounting hole and the first adjusting hole about a center; two side walls of the middle shell are also oppositely provided with second through holes which are symmetrical to the first through holes about the center; the inner shell assembly further comprises a second inner shell and a second pulley connected with one end of the second inner shell, and a fifth mounting hole and a sixth mounting hole are formed in the other end of the second inner shell at intervals. The second inner shell is connected with the outer shell through the fourth mounting hole, the second through hole and the fifth mounting hole, and the second inner shell is also connected with the outer shell through the second adjusting hole, the second through hole and the sixth mounting hole.

In some embodiments, the pulley mechanism further includes an elastic member, and both ends of the elastic member are connected to the first inner housing and the second inner housing, respectively.

In some embodiments, the elastic member comprises one of a coil spring, an air spring, and a rubber spring.

In some embodiments, the adjusting member is a screw, a third through hole is provided at an end of the housing, a threaded hole opposite to the third through hole is provided at an end of the middle housing, and a threaded end of the screw is connected to the threaded hole through the third through hole.

In some embodiments, the adjusting member includes a stud and a nut, a through hole is provided at an end of the housing, one end of the stud is fixedly connected with the middle housing, and the other end of the stud extends out of the housing through the through hole and is connected with the nut.

In some embodiments, the adjusting member is an electric push rod, one end of the electric push rod is fixed on the shell, and an output end of the electric push rod is connected with an end of the middle shell.

In some embodiments, the first inner shell is the same shape as the second inner shell.

In some embodiments, the top of the housing is provided with door and window mounting holes.

According to a second aspect of the present application, a door and window system is presented, comprising a door and window and at least one pulley mechanism according to the first aspect, the door and window being connected to the top of the housing.

Drawings

FIG. 1 shows a schematic view of a pulley mechanism in an embodiment of the present application at a minimum height;

FIG. 2 shows a schematic view of the pulley mechanism at its maximum height in an embodiment of the present application;

FIG. 3 shows a schematic structural view of a housing according to an embodiment of the present application;

FIG. 4 shows a schematic structural view of a middle shell according to an embodiment of the present application;

FIG. 5 illustrates a schematic structural diagram of an inner shell assembly according to an embodiment of the present application.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 to 5, fig. 1 shows a schematic diagram of a structure in which a pulley mechanism is at a minimum height in an embodiment of the present application, fig. 2 shows a schematic diagram of a structure in which a pulley mechanism is at a maximum height in an embodiment of the present application, fig. 3 shows a schematic diagram of an outer shell in an embodiment of the present application, fig. 4 shows a schematic diagram of a middle shell in an embodiment of the present application, and fig. 5 shows a schematic diagram of an inner shell assembly in an embodiment of the present application.

According to a first aspect of the present application, a pulley mechanism 100 is presented. As shown in fig. 1 and 5, the pulley mechanism 100 includes an outer housing 110, a middle housing 120, an inner housing assembly 130, and an adjustment member 140. As shown in fig. 3, the two side walls of the housing 110 are oppositely provided with a first mounting hole 111 and a first adjusting hole 112 above the first mounting hole 111. The two side walls of the housing 110 are the bottom slot structure of the housing 110, and the two side walls are the side walls of the slot. Wherein, the bottom is the side of the pulley mechanism 110 near the ground, and the top is the side of the pulley mechanism 100 near the door and window. The bottom of the outer case 110 is provided with a receiving groove 113, and the middle case 120 is disposed inside the outer case 110, that is, the middle case 120 is disposed in the receiving groove 113. The opposite arrangement means that the first mounting holes 111 on both side walls of the receiving groove 113 are aligned, and the first adjustment holes 112 on both side walls are also aligned. At the top of the housing 110 is a mounting plate 114, and the housing 110 may be coupled to a door window via the mounting plate 114.

As shown in fig. 4, both side walls of the middle case 120 are oppositely provided with first through holes 121. The opposite arrangement means that the first through holes 121 of both sidewalls are aligned. The middle case 120 has a U-shape, and the top and bottom of both sidewalls thereof are not shielded, so that the inner case assembly 130 can be completely received in the middle case 120.

As shown in fig. 1 and 5, the inner housing assembly 130 includes a first inner housing 131 and a first pulley 132 connected to one end of the first inner housing 131. For example, the first pulley 132 may be connected with the first inner case 131 through a pulley shaft. The first pulley 132 cooperates with a rail on the ground and can roll or slide relative to the rail. The other end of the first inner case 131 is provided with a second mounting hole 133 and a third mounting hole 134 at opposite intervals. In order to prevent the inner shell assembly 130 from shaking along the thickness direction when being received in the middle shell 120, as shown in fig. 5, the first inner shell 131 of the inner shell assembly 130 also has two sidewalls, and the two sidewalls of the first inner shell 131 are adhered to the inner surfaces of the two sidewalls of the middle shell 120. Accordingly, the second mounting hole 133 and the third mounting hole 134 are oppositely provided at both side walls.

As shown in fig. 1, the first inner case 131 is rotatably coupled with the outer case 110 through the first mounting hole 111, the first through hole 121, and the second mounting hole 133. Specifically, the first pin shaft 200 may sequentially pass through the first mounting hole 111, the first through hole 121, and the second mounting hole 133, so that the first inner case 131 is fixedly coupled with the outer case 110. At this time, the first pin shaft 200 is a rotation center, and the first inner case 131 is rotatable with respect to the outer case 120. Further, the first inner case 131 is also connected to the outer case 110 through the first adjustment hole 112, the first through hole 121, and the third mounting hole 134. Specifically, the second pin 300 may be sequentially passed through the first adjustment hole 112, the first through hole 121, and the third mounting hole 134, so that the first inner case 131 is coupled with the outer case 110. At this time, the first inner case 131 is also subjected to the angle limiting action of the first adjustment hole 112 while rotating with respect to the outer case 120. Specifically, as shown in fig. 3, the first adjustment hole 112 has a first end 1121 and a second end 1122, and the first end 1121 and the second end 1122 form an angle with the first mounting hole 133, and the first inner housing 131 can only rotate within the range of the angle. As shown in fig. 1, the third mounting hole 134 is located at the first end 1121 of the first adjusting hole 112 when the first inner housing 131 rotates, and the pulley mechanism 100 has a minimum height, and most of the inner housing assembly 130 is accommodated in the middle housing 120, and only the first pulley 132 protrudes to contact with the ground rail. As shown in fig. 2, the third mounting hole 134 is located at the second end 1122 of the first adjustment hole 112 when the first inner housing 131 is rotated, and the pulley mechanism 100 has a maximum height.

Further, the present application further has an adjusting member 140, where the adjusting member 140 is configured to drive the middle shell 120 to move in a length direction thereof with respect to the outer shell 110, thereby driving the first inner shell 131 to rotate within an included angle range. The realization principle of converting linear motion into rotary motion is as follows: as shown in fig. 1, when the third mounting hole 134 of the first inner case 131 is located at the first end 1121 of the first adjustment hole 112, the end of the middle case 120 is spaced apart from the end of the outer case 110 by a first distance D1. Then, the adjuster 140 drives the middle case 120 to linearly move (leftward movement) with respect to the outer case 110, so that the distance between the end of the middle case 120 and the end of the outer case 110 is gradually reduced. When the middle case 120 moves, the relative positions of the first through hole 121 and the first adjustment hole 112 are changed. At this time, since the second pin 300 sequentially passes through the first adjusting hole 112, the first through hole 121 and the third mounting hole 134, and the first through hole 121 is located on the middle shell 120, the first through hole 121 drives the second pin 300 to move synchronously with the middle shell 120, and then the second pin 300 drives the first inner shell 131 to rotate in the first adjusting hole 112 with the first pin 200 as a center until the third mounting hole 134 of the first inner shell 131 rotates to the second end 1122 of the first adjusting hole 112, at this time, as shown in fig. 2, the distance between the end of the middle shell 120 and the end of the outer shell 110 is reduced to a minimum distance, which is denoted as the second distance D2. Thereby, the linear motion of the middle case 120 from the first distance D1 to the second distance D2 is converted into the rotational motion of the first inner case 131 within the range of the included angle, which has the radius of rotation of the distance from the center of the first pulley 132 to the second mounting hole 133.

In the pulley mechanism 100 of the embodiment of the application, the adjusting member 140 drives the middle shell 120 to move relative to the outer shell 110 in the length direction thereof, so as to drive the first inner shell 131 to rotate within the range of the included angle, thereby realizing the adjustment of the height of the pulley mechanism 100. In the present embodiment, the height adjustment amount of the pulley mechanism 100 depends not only on the magnitude of the rotation angle but also on the magnitude of the rotation radius. Therefore, the rotation radius and the rotation angle can be flexibly set according to the actual situation, so that the pulley mechanism 100 with large adjustment amount is realized, and the universality of the door and window system is improved.

In some embodiments, as shown in fig. 1 to 5, both sidewalls of the housing 110 are further provided with a fourth mounting hole 115 and a second adjustment hole 116 opposite to the first mounting hole 111 and the first adjustment hole 112 with respect to the center. The two side walls of the middle case 120 are also oppositely provided with second through holes 122 symmetrical with the first through holes 121 about the center. The inner housing assembly 130 further includes a second inner housing 135 and a second pulley 136 connected to one end of the second inner housing 135. The other end of the second inner case 135 is provided with fifth and sixth mounting holes 137 and 138 at intervals. The second inner case 135 is coupled to the outer case 110 through the fourth mounting hole 115, the second through hole 122, and the fifth mounting hole 137, and the second inner case 135 is also coupled to the outer case 110 through the second adjustment hole 116, the second through hole 122, and the sixth mounting hole 138.

In this embodiment, the inner housing assembly 130 further includes a second inner housing 135 and a second pulley 136 connected to one end of the second inner housing 135. The fourth mounting hole 115 and the second adjustment hole 116 being symmetrical with the first mounting hole 111 and the first adjustment hole 112 about the center means that the fourth mounting hole 115 and the second adjustment hole 116 are integrally symmetrical with the first mounting hole 111 and the first adjustment hole 112 about the center. The fourth mounting hole 115 has the same shape as the first mounting hole 111, and the first adjustment hole 112 has the same shape as the second adjustment hole 116.

The second inner case 135 is coupled to the outer case 110 through the fourth mounting hole 115, the second through hole 122, and the fifth mounting hole 137, and specifically, as shown in fig. 1 and 2, the third pin shaft 400 may be sequentially inserted through the fourth mounting hole 115, the second through hole 122, and the fifth mounting hole 137 such that the second inner case 135 is rotatably coupled with respect to the outer case 110. At this time, the third pin 400 is a rotation center. Further, the second inner case 135 is also connected to the outer case 110 through the second adjustment hole 116, the second through hole 122, and the sixth mounting hole 138. Specifically, the fourth pin 500 may be sequentially passed through the second adjustment hole 116, the second through hole 122, and the sixth mounting hole 138 to connect the second inner case 135 with the outer case 110. At this time, the second inner case 135 is also subjected to the angle limiting action of the second adjustment hole 116 while rotating with respect to the outer case 120. Specifically, since the fourth mounting hole 115 and the second adjustment hole 116 are integrally symmetrical with the first mounting hole 111 and the first adjustment hole 112 with respect to the center, both ends of the second adjustment hole 116 and the fifth mounting hole 137 also form the same rotation angle as the first inner case 131, and the second inner case 135 can also rotate only within the angle range. Thus, as shown in fig. 1 and 2, when the adjusting member 140 drives the middle housing 120 to move in the length direction thereof relative to the outer housing 110, the first inner housing 131 and the second inner housing 135 can be simultaneously driven to rotate relative to the outer housing 110, and the rotation angles are the same, so that one pulley mechanism 100 can be supported by two pulleys, thereby being beneficial to reducing the stress of a single pulley and prolonging the service life of the pulley mechanism 100. Further, in order to ensure that the first and second inner casings 131 and 135 of the inner casing assembly 130 are adjusted to be the same in height, the first and second pulleys 132 and 136 may be provided to be the same in shape while the respective holes of the first inner casing 131 are symmetrically provided with the respective holes of the second inner casing 135.

In some embodiments, as shown in fig. 1, the pulley mechanism 100 further includes an elastic member 150, and both ends of the elastic member 150 are connected to the first inner housing 131 and the second inner housing 135, respectively. In this way, the elastic member 150 may provide a force when the middle case 120 is linearly moved with respect to the outer case 110 by the adjusting member 140, thereby facilitating saving of the adjusting force of the adjusting member 140. Specifically, when the door and window is mounted on the sliding rail together with the pulley mechanism 100, the pulley mechanism 100 is adjusted to the minimum height as shown in fig. 1 in advance for easy installation, and at this time, the elastic member 150 is in a stretched state. Then, the pulley mechanism 100 is adjusted to a proper height by the adjusting member 140, and the elastic member 150 can provide a reaction force during the tensile deformation, that is, a compressive restoring force, so that the adjusting member 140 can be adjusted with less effort.

Further, the elastic member 150 includes one of a coil spring, an air spring, and a rubber spring.

In some embodiments, as shown in fig. 1, the adjusting member 140 is a screw, the end of the outer case 110 is provided with a third through hole 117, the end of the middle case 120 is provided with a screw hole 123 opposite to the third through hole 117, and the threaded end of the screw is connected to the screw hole 123 through the third through hole 117. Thus, when the screw is rotated, the middle case 120 is linearly moved in the length direction thereof with respect to the outer case 110, thereby driving the inner case assembly 130 to rotate with respect to the outer case 110. The mode has simple structure and is beneficial to reducing the cost.

In some embodiments, the adjusting member 140 includes a stud and a nut, and the end of the outer case 110 is provided with a through hole, one end of the stud is fixedly connected with the middle case 120, and the other end of the stud protrudes out of the outer case 110 through the through hole and is connected with the nut. Thus, when the nut is rotated, the middle housing 120 is linearly moved in the length direction thereof with respect to the outer housing 110, thereby driving the inner housing assembly 130 to rotate with respect to the outer housing 110. The mode has simple structure and is beneficial to reducing the cost.

In some embodiments, the adjusting member 140 is an electric push rod, one end of the electric push rod is fixed on the outer shell 110, and an output end of the electric push rod is connected with an end of the middle shell 120. In this way, the middle shell 120 can linearly move along the length direction of the outer shell 110 through the telescopic movement of the electric push rod, so as to drive the inner shell assembly 130 to rotate relative to the outer shell 110. This approach is advantageous for improving automation of the height adjustment of the pulley mechanism 100.

In some embodiments, as shown in fig. 1, 3 and 4, the first adjustment aperture 112 is an arcuate aperture and the first through aperture 121 is a triangular aperture. The shape of the first adjustment hole 112 is adapted to the circular arc-shaped trajectory of the third mounting hole 134 when the first inner case 131 is rotated. The first through hole 121 is a triangular hole, wherein the top corner of the top of the triangular hole acts as a driving function. Specifically, when the middle case 120 moves in the length direction thereof with respect to the outer case 110, the top angle drives the second pin 300, and then the second pin 300 drives the third mounting hole 134 to move in the first adjustment hole 112, thereby rotating the first inner case 131 with respect to the outer case 110. The bottoms of the triangular holes play a role in avoiding. Specifically, when the middle case 120 moves along the length direction thereof with respect to the outer case 110, the bottom of the triangular hole may form a avoidance space for the first pin 200, thereby ensuring the normal operation of the pulley mechanism 100.

In some embodiments, as shown in fig. 1, the first inner housing 131 is the same shape as the second inner housing 135. The same shape means that the first inner case 131 and the second inner case 135 have the same structure. This arrangement is advantageous in improving the consistency of the height adjustment of the pulley mechanism 100, while also reducing the production cost.

In some embodiments, as shown in fig. 3, door and window mounting holes 118 are provided at both ends of the top of the housing 110, and the door and window is connected to the housing 110 through the door and window mounting holes 118. Further, the door and window mounting hole 118 has a waist-shaped structure, thereby being beneficial to improving the adaptability of the door and window to the housing 110 during mounting and improving the mounting convenience.

According to a second aspect of the present application, a door and window system is presented. Comprising a door and window and at least one pulley mechanism 100 according to the first aspect, wherein the door and window is connected to the top of the housing 110.

The door and window system of the present embodiment uses the pulley mechanism 100 described in the first aspect. The adjusting member 140 drives the middle shell 120 to move relative to the outer shell 110 in the length direction thereof, so as to drive the first inner shell 131 to rotate within the included angle range, and the height of the pulley mechanism 100 is adjusted. Also, the height adjustment amount of the pulley mechanism 100 depends not only on the magnitude of the rotation angle but also on the magnitude of the rotation radius. Therefore, the rotation radius and the rotation angle can be flexibly set according to the actual situation, so that the pulley mechanism 100 with large adjustment amount is realized, and the universality of the door and window system is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A pulley mechanism for use in a door and window system, the pulley mechanism comprising:

the shell, two side walls of the said shell are provided with the first mounting hole relatively, the first regulation hole above the said first mounting hole;

the middle shell is arranged inside the shell, and first through holes are oppositely formed in two side walls of the middle shell;

the inner shell assembly is arranged in the middle shell and comprises a first inner shell and a first pulley connected with one end of the first inner shell, a second mounting hole and a third mounting hole are formed in the other end of the first inner shell at intervals, the first inner shell is connected with the outer shell through the first mounting hole, the first through hole and the second mounting hole, and the first inner shell is connected with the outer shell through the first adjusting hole, the first through hole and the third mounting hole; and

and an adjusting member configured to drive the middle case to move in a length direction thereof with respect to the outer case so as to rotate the first inner case with respect to the outer case.

2. The pulley mechanism according to claim 1, wherein both side walls of the housing are also provided with a fourth mounting hole and a second adjusting hole which are symmetrical with respect to the first mounting hole and the first adjusting hole with respect to the center;

two side walls of the middle shell are also oppositely provided with second through holes which are symmetrical to the first through holes about the center;

the inner shell assembly further comprises a second inner shell and a second pulley connected with one end of the second inner shell, a fifth mounting hole and a sixth mounting hole are formed in the other end of the second inner shell at intervals, the second inner shell is connected with the outer shell through the fourth mounting hole, the second through hole and the fifth mounting hole, and the second inner shell is connected with the outer shell through the second adjusting hole, the second through hole and the sixth mounting hole.

3. The pulley mechanism according to claim 2, further comprising an elastic member, both ends of which are connected to the first inner housing and the second inner housing, respectively.

4. A pulley mechanism according to claim 3, wherein the elastic member comprises one of a coil spring, an air spring, and a rubber spring.

5. The pulley mechanism according to any one of claims 1 to 4, characterized in that the adjustment member is a screw, the end portion of the housing is provided with a third through hole, the end portion of the middle housing is provided with a threaded hole opposite to the third through hole, and the threaded end of the screw is connected to the threaded hole through the third through hole.

6. The pulley mechanism according to any one of claims 1 to 4, wherein the adjusting member includes a stud and a nut, and the end portion of the housing is provided with a through hole, one end of the stud is fixedly connected to the middle housing, and the other end thereof protrudes out of the housing through the through hole and is connected to the nut.

7. The pulley mechanism according to any one of claims 1 to 4, wherein the regulating member is an electric push rod, one end of the electric push rod is fixed to the housing, and an output end of the electric push rod is connected to an end portion of the middle housing.

8. The pulley mechanism of claim 2, wherein the first inner housing is the same shape as the second inner housing.

9. The pulley mechanism according to claim 1, wherein the top of the housing is provided with a door and window mounting hole.

10. A door and window system comprising a door and window and at least one pulley mechanism according to any one of claims 1 to 9, said door and window being connected to the top of said housing.

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