Pulley structure for sliding window and sliding window

Abstract

The pulley structure for the sliding window comprises a pulley assembly, an inner shell and an outer shell, the pulley assembly is fixed in the inner shell, the inner shell is arranged in the outer shell, reset elastic pieces are arranged on the two sides of the outer portion of the inner shell, the reset elastic pieces are in a symmetrical arc shape, and the reset elastic pieces are arranged in the outer shell. Each reset elastic piece comprises an elastic piece center position and two arc-shaped elastic pieces symmetrically arranged along the elastic piece center position, the elastic piece center positions are fixed to the outer wall of the inner shell, the ends of the two arc-shaped elastic pieces abut against the inner wall of the outer shell, and the inner shell is elastically supported in the outer shell through the two reset elastic pieces. The pulley structure not only can realize the sliding window opening function of the sliding window sash, but also can be matched with a window lock to realize the high-sealing window locking function.

Description

Technical Field

[0001] The utility model relates to the technical field of doors and windows, and in particular to a pulley structure for a sliding window and a sliding window. Background Art

[0002] At present, the opening and closing of common sliding windows are achieved by using a pulley group moving on a slide rail. In order to enhance the sealing of sliding doors, sealing strips are often provided around the window sashes. During the pushing and pulling process, the surrounding sealing strips directly contact the window frame, which not only increases the resistance to pushing and pulling, but also causes wear to the sealing strips. Utility Model Content

[0003] In view of the defects of the above-mentioned prior art, one of the purposes of the utility model is to provide a pulley structure for sliding windows, which can not only realize the sliding and pulling window opening function of the sliding window sash, but also can cooperate with the window lock to realize the high-sealing window locking function. The second purpose of the utility model is to provide a sliding window that will not cause wear to the sealing strip and can be pushed and pulled smoothly.

[0004] One of the purposes of the utility model is achieved by the following technical solution:

[0005] A pulley structure for a sliding window, comprising a pulley assembly, an inner shell and an outer shell, wherein the pulley assembly is fixed inside the inner shell, the inner shell is arranged inside the outer shell, and reset springs are provided on both sides of the outside of the inner shell, the reset springs are symmetrically arc-shaped, and the reset springs include a spring center position and two arc-shaped springs symmetrically arranged along the spring center position, the spring center position is fixed on the outer wall of the inner shell, the ends of the two arc-shaped springs both abut against the inner wall of the outer shell, and the inner shell is elastically supported in the outer shell by the two reset springs.

[0006] Furthermore, the inner top wall of the outer shell is provided with a plurality of parallel concave ribs, and the outer top wall of the inner shell is provided with a plurality of guide blocks, and the guide blocks slide along the concave ribs; guide grooves are provided at both ends of the top wall of the outer shell, and the top wall of the inner shell is provided with guide columns, and the guide columns slide along the guide grooves.

[0007] Furthermore, connecting plates are provided at both ends of the outer shell, a bottom plate is extended inward from the bottom of the connecting plate, the bottom plate and the connecting plate are L-shaped, and the bottom plate supports the bottom end surfaces of the two ends of the inner shell.

[0008] Furthermore, the pulley assembly includes a pulley member and a fixed plate, the pulley member and the fixed plate are both two in number, the two pulley members are arranged in parallel front and back, the two fixed plates are respectively fixed on both sides of the two pulley members, and the fixed plates are fixed inside the inner shell.

[0009] Furthermore, the pulley assembly also includes a pulley shell, and vertical long holes are opened on the two side walls of the pulley shell. Rivet holes are opened in the middle of the two fixing plates, and cylindrical rivets are arranged in the rivet holes. The cylindrical rivets pass through the long holes and fix the fixing plates and the pulley shell together.

[0010] Furthermore, both side walls of the inner shell are provided with inclined long holes, and the cylindrical rivet passes through the long oblique holes, the long strip holes and the rivet holes at the same time.

[0011] Furthermore, it comprises a rotating screw, the head of which is limited on one end wall of the inner shell, a threaded hole is opened on one end wall of the pulley shell, and the rotating screw is screwed into the threaded hole to drive the pulley shell to move relative to the inner shell.

[0012] Furthermore, a guide long hole is opened on one side wall of the inner shell, and the length direction of the guide long hole is the direction in which the pulley shell moves relative to the inner shell. A protruding bump is provided on the side wall of the pulley shell, and the bump moves along the guide long hole.

[0013] Furthermore, the head of the rotating screw is provided with a limit card, and the limit card is arranged on the inner side of the end wall of the inner shell. The limit card is provided with a limit hole for the head of the rotating screw to pass through. The limit card clamps the head of the rotating screw and is used to limit the movement of the rotating screw relative to the inner shell.

[0014] The second purpose of the utility model is achieved by the following technical solution:

[0015] A sliding window comprises the above-mentioned pulley structure for the sliding window.

[0016] The beneficial effects of the utility model are:

[0017] 1. Compared with the traditional pulley, the pulley structure can not only realize the push-pull window opening function of the sliding window sash, but also can cooperate with the window lock to realize the high sealing window locking function. There is no need to set a sealing strip on the sliding window sash, avoiding the wear of the sealing strip and the problem of pushing and pulling resistance;

[0018] 2. Under the guidance of the oblique long hole and the long strip hole, the cylindrical rivet drives the pulley assembly to move to the lower left or upper right. By adjusting the rotating screw, the height of the pulley can be adjusted to fill the gaps between different profiles and the gaps caused by assembly errors, which can meet more usage scenarios;

[0019] 3. Compared with traditional sliding windows, the sealing strip on this sliding window is set on the window frame. During the sliding process, the sealing strip will not be worn and will not affect the sliding, which extends the service life of the sealing strip and enhances the sealing effect. At the same time, the sliding window locks the window and seals it by squeezing the sealing strip, which has greater sealing strength and better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural exploded diagram of the pulley structure in the utility model;

[0021] Figure 2 It is a top view of the pulley structure in the utility model;

[0022] Figure 3 It is a partial structural schematic diagram of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the housing in the utility model;

[0024] Figure 5 It is a cross-sectional schematic diagram of the pulley structure in the utility model;

[0025] Figure 6 It is a structural exploded view of the pulley assembly and the inner shell in the utility model;

[0026] Figure 7 It is a structural schematic diagram of the sliding window in the utility model;

[0027] Figure 8 It is a cross-sectional schematic diagram of the sliding window of the utility model when it is pushed or pulled;

[0028] Fig. 9 It is a cross-sectional schematic diagram of the sliding window in the utility model when the window is locked.

[0029] In the figure: 100, pulley structure; 110, pulley assembly; 111, pulley member; 112, fixing plate; 113, short rivet; 114, pulley housing; 115, long hole; 116, rivet hole; 117, cylindrical rivet; 118, threaded hole; 119, bump; 120, rotating screw; 121, nut; 122, limiting part; 123, threaded part; 130, limiting card; 131, limiting hole; 140, inner shell; 141 , guide block; 142, guide column; 143, oblique long hole; 144, through hole; 145, guide long hole; 150, shell; 151, concave rib; 152, guide groove; 153, clamping hole; 160, reset spring; 161, spring center position; 162, arc spring; 170, connecting plate; 171, clamping block; 180, bottom plate; 200, window frame; 300, sliding window sash; 400, sealing strip; 500, handle; 600, slide rail. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clearly understood, the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Example 1

[0032] like Figures 1 to 6 As shown, the present embodiment provides a pulley structure for a sliding window, including a pulley assembly 110, an inner shell 140 and an outer shell 150, the pulley assembly 110 is fixed inside the inner shell 140, the inner shell 140 is arranged inside the outer shell 150, and reset springs 160 are provided on both sides of the outside of the inner shell 140, the reset springs 160 are symmetrically arc-shaped, the reset springs 160 include a spring center position 161 and two arc-shaped springs 162 symmetrically arranged along the spring center position 161, the spring center position 161 is fixed on the outer wall of the inner shell 140, the ends of the two arc-shaped springs 162 both abut against the inner wall of the outer shell 150, and the inner shell 140 is elastically supported in the outer shell 150 by the two reset springs 160.

[0033] During installation, the housing 150 is fixed to the top and bottom of the sliding window sash 300, and the pulley assembly 110 is aligned with the slide rail 600 on the window frame 200 and cooperates with the slide rail 600. During the process of pushing, pulling and locking the window, the pulley assembly 110 is always set on the slide rail 600 and will not be offset.

[0034] The pulley assembly 110 and the inner shell 140 are fixed together. With the support of the reset spring sheet 160 and without being affected by external forces, the pulley assembly 110 and the inner shell 140 are located in the middle of the outer shell 150. When the outer shell 150 is subjected to external forces, since the position of the pulley assembly 110 is limited by the slide rail 600, the outer shell 150 will squeeze the reset spring sheet 160 on one side, and the position of the outer shell 150 will be offset relative to the positions of the pulley assembly 110 and the inner shell 140.

[0035] The arc openings of the two arc-shaped spring pieces 162 face the side wall of the outer shell 150, and the ends thereof are slightly squeezed and contacted with the inner wall of the outer shell 150. The two reset spring pieces 160 have the same structure and size, so the elastic force they can provide is also the same. When not subject to external force, the two reset spring pieces 160 jointly support the inner shell 140, so that the inner shell 140 is located in the middle of the outer shell 150, and the pulley assembly 110 is fixed together with the inner shell 140, so at this time the pulley assembly 110 is also maintained in the middle of the outer shell 150, and the pulley assembly 110 cooperates with the slide rail 600 on the window frame 200. Under the condition that the pulley assembly 110 is aligned with the slide rail 600, the sliding window sash 300 can slide to open the window under the action of the pulley assembly 110, thereby realizing the push-pull function of the sliding window.

[0036] When the window needs to be locked, the sliding window sash 300 is first pushed to the window closing position, and then an external force is applied to the outer shell 150 while ensuring that the pulley assembly 110 is aligned with the slide rail 600. Since the positions of the pulley assembly 110 and the inner shell 140 are fixed relative to the position of the slide rail 600, when the outer shell 150 is subjected to a force applied to the outside of the window, the outer shell 150 will squeeze the reset spring piece 160 close to the inner side of the window, and the outer shell 150 will move relative to the inner shell 140 and the pulley assembly 110. Since the outer shell 150 is fixed on the sliding window sash 300, the outer shell 150 will drive the sliding window sash 300 to move toward the outside of the window, and stop moving when the frame of the sliding window sash 300 abuts against the window frame 200. At this time, a window lock is used to lock and fix the sliding window sash 300, thereby achieving the locking and sealing of the window sash.

[0037] When the window is unlocked, the outer shell 150 is no longer affected by external force, and the compressed reset spring 160 will automatically restore its supporting shape. Driven by the reset spring 160, the outer shell 150 will drive the sliding window sash 300 to move toward the inside of the window until the inner shell 140 is in the middle position of the outer shell 150 again. The outer shell 150 stops moving and the sliding window sash 300 can be pushed and slid again.

[0038] Compared with the traditional pulley, the pulley structure 100 can not only realize the sliding and pushing functions of the sliding window sash 300, but also can cooperate with the window lock to realize the front and rear high-sealing window locking functions. There is no need to set a sealing strip 400 on the sliding window sash 300, avoiding the wear of the sealing strip 400 and the problem of pushing and pulling resistance.

[0039] Furthermore, the inner top wall of the outer shell 150 is provided with a plurality of parallel concave ribs 151, and the outer top wall of the inner shell 140 is provided with a plurality of guide blocks 141, and the guide blocks 141 slide along the concave ribs 151; guide grooves 152 are provided at both ends of the top wall of the outer shell 150, and the top wall of the inner shell 140 is provided with guide columns 142, and the guide columns 142 slide along the guide grooves 152.

[0040] Through the cooperation between the guide block 141 and the concave rib 151 as well as the guide column 142 and the guide groove 152, the sliding direction of the outer shell 150 relative to the inner shell 140 is ensured, so that the outer shell 150 can move smoothly in the inner shell 140, avoiding shaking of the outer shell 150 when sliding toward the outside of the window, realizing the translation of the sliding window sash 300 toward the outside of the window and realizing a strong sealing function, and also facilitating the outer shell 150 to return to its original position when sliding toward the inside of the window by itself.

[0041] Furthermore, connecting plates 170 are provided at both ends of the outer shell 150 , and a bottom plate 180 extends inward from the bottom of the connecting plate 170 . The bottom plate 180 and the connecting plate 170 are L-shaped, and the bottom plate 180 supports the bottom end surfaces of both ends of the inner shell 140 .

[0042] When the outer shell 150 moves relative to the inner shell 140, the bottom plate 180 also moves on the bottom end surfaces at both ends of the inner shell 140. Specifically, the outer shell 150 and the connecting plate 170 can be processed into an integral structure or can be separated.

[0043] Furthermore, the pulley assembly 110 includes a pulley member 111 and a fixing plate 112. There are two pulley members 111 and two fixing plates 112. The two pulley members 111 are arranged in parallel front and back. The two fixing plates 112 are respectively fixed on both sides of the two pulley members 111, and the fixing plates 112 are fixed inside the inner shell 140. The two fixing plates 112 fix the two pulley members 111 together through short rivets 113, so as to facilitate fixing the pulley assembly 110 as a whole to the inner shell 140. There are two short rivets 113, and the short rivets 113 are arranged on the central axis of the pulley member 111.

[0044] Furthermore, the pulley assembly 110 also includes a pulley housing 114, and vertical long holes 115 are opened on the two side walls of the pulley housing 114. Rivet holes 116 are opened in the middle of the two fixing plates 112. Cylindrical rivets 117 are arranged in the rivet holes 116. The cylindrical rivets 117 pass through the long holes 115 and fix the fixing plates 112 and the pulley housing 114 together.

[0045] Furthermore, inclined oblique long holes 143 are formed on both side walls of the inner shell 140 , and the cylindrical rivet 117 passes through the oblique long hole 143 , the long strip hole 115 and the rivet hole 116 at the same time.

[0046] Furthermore, it includes a rotating screw 120 , the head of which is limited on one end wall of the inner shell 140 , a threaded hole 118 is provided on one end wall of the pulley shell 114 , and the rotating screw 120 is screwed into the threaded hole 118 and drives the pulley shell 114 to move relative to the inner shell 140 .

[0047] The rotating screw 120 includes a nut 121, a limiting portion 122 and a threaded portion 123 which are arranged in sequence. The limiting portion 122 and the nut 121 serve as the head of the rotating screw 120. A through hole 144 for the rotating screw 120 to pass through is provided on one end wall of the inner shell 140, and the nut 121 is located outside the inner shell 140. The head of the rotating screw 120 is limited on one end wall of the inner shell 140, that is, the head of the rotating screw 120 is limited on one end wall of the inner shell 140 by the limiting portion 122. The rotating screw 120 can rotate in the through hole 144, but the position of the rotating screw 120 and the position of one end wall of the inner shell 140 are relatively fixed. The rotating screw 120 does not move when rotating, but is limited on one end wall of the inner shell 140.

[0048] The rotating screw 120 and the pulley housing 114 are threadedly connected, so when the rotating screw 120 is rotated, displacement occurs between the rotating screw 120 and the pulley housing 114 . Since the position of the rotating screw 120 is relatively fixed, the pulley housing 114 moves toward or away from the rotating screw 120 .

[0049] Specifically, when the rotating screw 120 is rotated clockwise, the rotating screw 120 drives the pulley housing 114 to move toward the direction close to the rotating screw 120, and under the guidance of the oblique long hole 143 and the long hole 115, the cylindrical rivet 117 moves toward the lower left along the oblique long hole 143 and moves downward along the long hole 115, and the pulley assembly 110 moves to the lower left; on the contrary, when the rotating screw 120 is rotated counterclockwise, the rotating screw 120 drives the pulley housing 114 to move away from the rotating screw 120, and under the guidance of the oblique long hole 143 and the long hole 115, the cylindrical rivet 117 moves toward the upper right along the oblique long hole 143 and moves upward along the long hole 115, and the pulley assembly 110 moves to the upper right. When the adjustment of the rotating screw 120 stops, the pulley assembly 110 stops moving and stops being fixed at this position. By adjusting the height of the pulley 111, the gaps between different profiles and the gaps caused by assembly errors can be filled, which can meet more usage scenarios.

[0050] Preferably, the housing 150 and the connecting plate 170 are separate structures, and the connecting plate 170 can be removed from the housing 150 to provide space for adjusting the rotating screw 120. Specifically, a clamping block 171 is provided on the top of the connecting plate 170, and a clamping hole 153 is provided on the housing 150. The clamping block 171 is movably clamped in the clamping hole 153, so that the connecting plate 170 can be detached from the housing 150.

[0051] Furthermore, a guide slot 145 is provided on one side wall of the inner housing 140, the length direction of the guide slot 145 is the direction in which the pulley housing 114 moves relative to the inner housing 140, and a protruding block 119 is provided on the side wall of the pulley housing 114, and the block 119 moves along the guide slot 145. The guide slot 145 provides a guide for the block 119, so as to facilitate fine adjustment of the position of the pulley member 111.

[0052] Furthermore, a limit card 130 is provided at the head of the rotating screw 120. The limit card 130 is arranged on the inner side of the end wall of the inner shell 140. A limit hole 131 is opened on the limit card 130 for the head of the rotating screw 120 to pass through. The limit card 130 clamps the head of the rotating screw 120 and is used to limit the movement of the rotating screw 120 relative to the inner shell 140.

[0053] The limit card 130 is stuck in the limit portion 122 of the rotating screw 120. With the cooperation of the limit card 130, the rotating screw 120 can rotate in the through hole 144 and the limit card 130, but the position of the rotating screw 120 and the position of one end wall of the inner shell 140 are relatively fixed. During the rotation of the rotating screw 120, the threaded portion 123 will not escape from the through hole 144, and the nut 121 will not move, which will not affect the installation of the connecting plate 170 and the installation of the entire pulley structure 100.

[0054] Example 2

[0055] like Figures 1 to 9 As shown, this embodiment provides a sliding window, including the pulley structure 100 for the sliding window, the window frame 200 and the sliding window sash 300 described in Example 1, wherein the outer shell 150 is fixed to the top and bottom of the sliding window sash 300, the pulley member 111 is positioned toward the upper and lower sliding rails 600, and a sealing strip 400 is fixed on the periphery of the window frame 200 at a position in contact with the sliding window sash 300, and the sliding window sash 300 is provided with a handle 500 for pushing the sliding window sash 300 toward the outside of the window.

[0056] Of course, the window frame 200 should also be fixed with a slideway for gradually pushing the handle 500 out of the window, as well as a window lock for fixing the position of the handle 500, and the handle 500 can rotate along the slideway.

[0057] Working principle:

[0058] Install the pulley structure 100 on the sliding window sash 300, remove the connecting plate 170, rotate the rotating screw 120, and drive the pulley housing 114 to move by rotating the screw 120. Under the guidance of the long hole 115 and the oblique long hole 143, fine-tune the upper and lower heights of the pulley member 111 to make up for the gap caused by processing or assembly, so that the pulley member 111 and the slide rail 600 can be perfectly matched.

[0059] When locking the window, first push the sliding window sash 300 to the window closing position, and then drive the handle 500 to rotate along the slideway by external force. Under the guidance of the inner shell 140, the outer shell 150 is driven by external force to squeeze the reset spring 160, and the outer shell 150 moves relative to the inner shell 140 and the pulley 111. At the same time, the outer shell 150 also drives the sliding window sash 300 to move toward the outdoors, and the moving distance is about 5 mm. When the peripheral frame on the sliding window sash 300 completely abuts against the sealing strip 400 on the window frame 200, the sliding window sash 300 stops moving and locks the window. At this time, the sliding window sash 300 is squeezed and sealed, thereby realizing strong sealing and locking the window.

[0060] When the window is unlocked, an external force drives the handle 500 to rotate in the opposite direction of the slide, and the compressed sealing strip 400 will rebound into the window. The outer shell 150 is no longer affected by external force, and the squeezed reset spring 160 begins to recover to its original state by itself. Under the reset movement of the reset spring 160, the outer shell 150 drives the sliding window sash 300 to move in the direction of the window. When the inner shell 140 is in the middle position of the outer shell 150, the reset spring 160 completely recovers its supporting shape, the reset spring 160 is no longer active, and the outer shell 150 also stops moving. The sliding window sash 300 also returns to the center position of the pulley assembly 110, the sliding window sash 300 is separated from the sealing strip 400, the seal is released, and the sliding window sash 300 slides to open the window under the action of the pulley member 111.

[0061] Compared with the traditional sliding window, the sealing strip 400 on the sliding window is arranged on the window frame 200. During the sliding process, the sealing strip 400 will not be worn and will not affect the sliding, thereby extending the service life of the sealing strip 400 and enhancing the sealing effect. At the same time, the sliding window is locked and sealed by squeezing the sealing strip 400, which has a greater sealing strength and a better sealing effect.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. A pulley structure for a sliding window, It is characterized in that The invention comprises a pulley assembly (110), an inner shell (140) and an outer shell (150), wherein the pulley assembly (110) is fixed inside the inner shell (140), the inner shell (140) is arranged inside the outer shell (150), and reset springs (160) are arranged on both sides of the outer surface of the inner shell (140), wherein the reset springs (160) are symmetrically arc-shaped, and the reset springs (160) comprise a spring center position (161) and two arc-shaped springs (162) symmetrically arranged along the spring center position (161), wherein the spring center position (161) is fixed on the outer wall of the inner shell (140), and the ends of the two arc-shaped springs (162) both abut against the inner wall of the outer shell (150), and the inner shell (140) is elastically supported inside the outer shell (150) by the two reset springs (160).

2. A pulley structure for a sliding window according to claim 1, It is characterized in that The inner top wall of the outer shell (150) is provided with a plurality of parallel concave ribs (151), and the outer top wall of the inner shell (140) is provided with a plurality of guide blocks (141), and the guide blocks (141) slide along the concave ribs (151); guide grooves (152) are provided at both ends of the top wall of the outer shell (150), and the top wall of the inner shell (140) is provided with guide columns (142), and the guide columns (142) slide along the guide grooves (152).

3. A pulley structure for a sliding window according to claim 1, It is characterized in that Connecting plates (170) are provided at both ends of the outer shell (150), a bottom plate (180) extends inward from the bottom of the connecting plate (170), the bottom plate (180) and the connecting plate (170) are L-shaped, and the bottom plate (180) supports the bottom end surfaces of both ends of the inner shell (140).

4. The pulley structure for a sliding window according to claim 1, It is characterized in that The pulley assembly (110) comprises a pulley member (111) and a fixing plate (112), wherein the pulley member (111) and the fixing plate (112) are both two in number, the two pulley members (111) are arranged in parallel front and back, the two fixing plates (112) are respectively fixed on both sides of the two pulley members (111), and the fixing plates (112) are fixed inside the inner shell (140).

5. A pulley structure for a sliding window according to claim 4, It is characterized in that The pulley assembly (110) further comprises a pulley housing (114), and vertical elongated holes (115) are provided on both side walls of the pulley housing (114). Rivet holes (116) are provided in the middle of the two fixing plates (112), and cylindrical rivets (117) are provided in the rivet holes (116). The cylindrical rivets (117) pass through the elongated holes (115) and fix the fixing plates (112) and the pulley housing (114) together.

6. A pulley structure for a sliding window according to claim 5, It is characterized in that The two side walls of the inner shell (140) are provided with inclined oblique long holes (143), and the cylindrical rivet (117) passes through the inclined long holes (143), the long strip holes (115) and the rivet holes (116) at the same time.

7. A pulley structure for a sliding window according to claim 6, It is characterized in that The invention comprises a rotating screw (120), the head of which is limited on one end wall of the inner shell (140), a threaded hole (118) is provided on one end wall of the pulley shell (114), and the rotating screw (120) is screwed into the threaded hole (118) to drive the pulley shell (114) to move relative to the inner shell (140).

8. The pulley structure for a sliding window according to claim 7, It is characterized in that A guide long hole (145) is provided on one side wall of the inner shell (140), and the length direction of the guide long hole (145) is the direction in which the pulley shell (114) moves relative to the inner shell (140). A protruding bump (119) is provided on the side wall of the pulley shell (114), and the bump (119) moves along the guide long hole (145).

9. The pulley structure for a sliding window according to claim 7, It is characterized in that The head of the rotating screw (120) is provided with a limit card (130), and the limit card (130) is arranged on the inner side of the end wall of the inner shell (140). The limit card (130) is provided with a limit hole (131) for the head of the rotating screw (120) to pass through. The limit card (130) clamps the head of the rotating screw (120) and is used to limit the movement of the rotating screw (120) relative to the inner shell (140).

10. A sliding window, It is characterized in that The invention comprises a pulley structure for a sliding window as claimed in any one of claims 1 to 9.

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